US1850268A - Positioning tool - Google Patents

Description

March 22, 1932. H, w p ET AL 1,850,268

- POSITIONING TOOL Filed May 29, 1930 l, wd 1. 6M

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Patented Mar. 22, .1932

HARRY W. K ULP ,ANnf MAR'r-IN o. DELLINGER, or Lsivcas'r a, rEnnsYLvANIA' rosirroivrne moon Application filed May 29,

This application is for improvements on our invention set forth ,in our application Ser. No. 4095M, filed November 23, 1930, for positioning tools. I v

This present invention relates to one-hand plier type tools primarily intended for use in inserting and properly positioning the removable locking means cooperating with the lower end portions respectively of the respective valve-stems to limit the downward movement of the respective spring retainers or cups or washers in connection with the operations necessary to the grinding or replacement of poppet-valves in internal combustion engines, particularly internal combustion engines as mounted in automobiles and as-conlined and obstructed by the related parts, such as the generator, distributor, carburetor, steering rod, chassis frame and other parts of the automobile. s i

Of recent years it has been the practice to arrange the valve-stems, andpush rods, with their cooperating parts in the interior of the engine block, permitting access thereto through'an opening'or port, normally covered by removable cover plates to keep out dust and dirt. At first this opening was usuall quite wide in a verticaldirection, allowing relatively easy access, and the top. of the crank-case and the adjacent portion of the cylinder block were such as to completely close the top of the crank-case at all points except for the passage of the rods, and the lockingmeans, for limiting the downward movement'of the spring retainers or cups on the valve-stems 'under'the'thrust of their respective cooperating valve-springs, were cross-pins or other elements requiring to be gripped and positively displaced by the mechanic. However, as time has passed the Widthof the access opening or port has decrea sed vhilethe number of accessories has increased, rendering access to the valve-stems, springs, retainers and locks progressively more difficult.

Quite recently there has been a change whereby the push rods have been mounted in removable spiders. as. illustrated in'the patent to Horning, No. 1,604,412,, granted October 26, 1926, the'top-of the crank-case 1920. Serial No. emcee.

on either side of the spider being left open, and it has been usual to continue the upper edge of theopening downin a flange, to still further narrow the access opening or portwhich is normally closed by a cover plate, so that when the springs with their retainer cups are raised they are practically entirely be hindthe outer wall and the locking means are adjacent the top edge of the opening and to the rear thereof, so that in the usual multiplecylinder engines access to either remove or replace saidlocking means is extremely difli cult. I r

In a number of different engines of this type it is nowjusual to employ split conical locking means normally pressed radially inward toward each other by a cooperating conical face of the retainer to force and keep said locking means in a groove or radially inward of an enlarged lower end of the valvestem, so that the replacement of these locking devices, herseshoes or semicircular cone members is a rather difficult, trying and puzzlin g task and often a number of attempts are necessary, and oftenin unsuccessful attempts said locking means or horseshoes fall on an inaccessible part of thepush-rod spider or securing bolts for the latter, and sometimes fall between the face of said spider and the opposed face of the engine block or crank case down into the latter.

here a valve-stem having a cylindrical reduced portion correspondingtogportion F with opposed upper and lower annular shoulders extending perpendicularly to the axis of the valve-stein, a well knownand at present extensively used construction, is used, the diiiiculty is even more pronounced, as it is essential to have the two cooperating elements of the locking meansso positioned that they will be forced radially into position by the retainer D, and, particularly with this" form of valve-stem, it the keepers be slightly inclined to the horizontal, or to a plane perpendicular to the aXis of the valve-stem, their upper or lower portions "will strike against one orthe other of saidshouldersandso will not catch, but will be forced out by the retainer and fall as the retainer D engages them, requiring repetition of the effort.

The present invention has been developed with the above considerations in view, and has primarily for its objects to provide a tool for properly positioning said locking means or horseshoes; to provide in a tool suitable to this purpose a pair of cooperating jaws for carrying and positioning respectively the cooperating members of a pair of horseshoes or locking elements, said jaws being so related to each other as to have swinging movement toward and from each other so that they may be spread to receive between them the valve-stem and may be closed or moved toward each other to apply the respective locking horseshocs or elements to opposite sides of the valve-stem in said groove or reduced portion; to provide special simple means, preferably spring pressed or yielding, for holding the respective locking horseshoes or elements in the respective jaws of the tool preparatory to and during application to the valve-stem; said means preferably being movably mounted respectively on said jaws respectively; to provide a spring or other yielding means for forcing said holding means against said locking horseshoes or elements as disposed in the respective jaws; to provide a spring or equivalent for forcing said jaws toward each other to, and in, closed position; to provide a very light tool having spreading jaws in combination with means for form ing said jaws toward each other whereby when the locking elements or horseshoes, as mounted in said jaws, have been positioned about and against the valve stem, the tool may be released and its resilient means will hold it in the arranged position in opposition to its weight as increased by the leverage of its outer portion, so that if a mechanic is interrupted in his task he may leave the tools as applied without having to do his work all over; to provide a one-hand plie'r type tool for this purpose, so that the mechanic may employ one hand in operating the valve-spring lifter, while using his other hand to manipulate the tool of the present invention; as, for instance, where he is using a valve-spring lifter not provided with a lock or catch; to provide a tool curved or offset lengthwise so that it may be inserted in the upper portion of the access port or opening of the engine and then rocked, wiggl'ed and/or twisted up and down, as may be necessary, without interference by striking against the upper edge of said opening; to provide a tool of few parts, simple in operation, cheap of manufacture and suitable to production on a large production basis by simple sheet metal stamping and assembling operations.

In this application we show and describe only the preferred embodiment of our invention simply by way of illustration of the practice thereof, as by law required. However, we are well aware that our invention is capable of other and different embodiments, and that the various details thereof may be modified in a number of ways, all without departing from our said invention. Therefore, the drawings and description herein are to be considered as merely illustrative and not as exclusive.

In the accompanying drawings:

Figure 1 represents a perspective view of a tool embodying our invention, with the locking means held therein, as used in applying said locking means to a valve-stem of an engine, the spring and retainer on said stem being shown raised by a valve-spring lifter and with alocking means catching shield positioned between the jaws of the lifter;

Figure 2, a perspective view of the tool by itself;

Figure 3, a top plan view of the tool with the jaws closed;

Figure l, a fragmentary top plan View, showing the jaws spread or open and with the respective locking means yieldingly held the-rein Figure 5, a sectional View on the line 55 of Fig. 3, looking in the direction of the arrows.

Figure 6, a sectional view on the line 6-6 of Fig. 3, looking in the direction of the arrows; and

Figure 7, an end elevation of one of the jaws, looking from line 7--7 of Fig. 4 in the direction of the arrows.

In the drawings, Figs. 3, l, 5, 6 and 7 are made to full size scale from an actual full size commercial tool; Fig. 2 is made approximately five-sixths actual size, and in Fig. 1 there has been no attempt to stick exactly to actual scale or relative size of tools, engine and parts thereof, but merely to illustrate the use of the tool in a general way.

Referring now in detail to the drawings, A designates the engine generally; B, the valvestems of the usual poppet-valves (not shown) thereof; C, the usual valve-springs; D, the valve-spring retainers, cups or washers; E, the split cone or semicircular composite coneshape locking means normally received in the reduced portion F of the valve-stems B with their cone, faces presented upwardl and resting on the lower annular shoulder Cir of the valve-stem and normally so held by the cooperating inner lower conical face of the retainers, or cups or washers D; H, the puslrrod spider; J, the push-rods; K, the adjustable push-rod heads; and L, the locknuts for the latter..

The parts specifically immediately above referred to are old and well known and are merely briefly described as above to aid in giving a clearer understanding of the present invention.

M designates generally a valve-spring lifter 5 with which the present invention is preferably used, and said valve-spring lifter maybe constructed as illustrated in accordance with our pending application Serial No.

331,77 3, filed January 1-1, 1929,'and N designates generally a shield preferably employed.

during the operation and which may be constructed as illustrated in accordance with our Patent 1,776,159 granted Septemberl6, 1930 p r 1 v a The tool of'the present inventionispreferably a one-hand plier type of device, and more specifically is of that form of plier type tool'wherein the operative arms or jaws move apart or spread as the handles or operating levers are moved toward each'other as the mechanic closes his hand and wherein pref erably some yielding or resilient means is provided for forcing or urgin'gthe operative arm or jaws toward each other to or toward closed position when the leverage or pressure on the handles or operative levers is relaxed. 'However, viewing our invention in one of its broader aspect-s, it is not essential that 'itjshall beembodied in a one-hand non-crossing lever form plier type tool, nor thatit shall be a plier type tool, nor a onehand type tool, northat resilient orother self-acting means tending to forcethe opera tive jaws or arms toward each othershall be provided.

In the embodiment illustrated two preferably light thin sheet metal members of genera-l U-shape in cross-section having their inner channel'faces presented toward each other are provided with oppositely presented lugs 1 and 2, the lugs2lofthe one member fitting between the lugs '1 of the other member, and a pivot'3 passing through saidlapped lugs l and. 2 and preferably having its'ends upset in usual known 'mannerservesto pivotally connect the two members, a perforated supporting -spacing disk or washer 4; preferably being interposed between the lugs 2.

Each of the bodymembers so pivotally connected preferably consists of a handle or lever portion 5 extending rearward from the pivot 3 and an operative armor jaw'6 extending forward from said pivot 3; a I

Each jaw has its'inner edge portion cut out preferably in the form of a semicircle or approximately of that shape, as at 7, adjacent its forward end,the cut-outs or notches 7 of the respective jaws registering, when the 1 jaws are closed, to togetherdefine a substantially circular or preferablysubstantially circular opening to preferably freely accommodate a valve-stem between them when closed, said opening so defined preferably being of a diameter appreciablyin excess of the diameter of the lower end portion or lower annular shoulder G of the valve-stem B, so that as the retainer D bears downon the looking elements E, and eventually onthetool as it strips the locking elements E" therefrom,

said tool will not becaught between the shoulder G and the lower ends of the-locking'eleiments or horseshoes'E, but will be left'free to be removed.

The opposed inner edges of the jaws 6 w ill preferably beformed with preferablycontin- I uous flanges 8 fromsaidnotches 7 at diametri cally opposite points of the opening defined by the jaws 6 when closed,,said flangesS ex tending lengthwise of the jaws 6.: The opposed inner fa'ces of said flanges will preferably "extend parallel to each other and pref Y erably perpendicularly tothe lower .facesof the respec-tlve jaws 6; -Tl1e upper faces of the jaws 6, at least adjacentthe notches7, will r.

preferably extend in'a common plane so as to provide flat supporting'surfaces for the corresponding fiat straight lower faces of the adj acent-iportions of the upper faces of. their respective jaws 6.

The function of these flanges 8 is simply to act as limiting stops for the lockingelements E when inserted in the tool andas acted upon by the spring-pressed arms 9, and for that reason it is not essential-that these flanges or stops 8 shall be of the form shown, or of flange form, and it will sufiice'if any means accomplishing the same function be provided. The spring-pressed or yielding arms 9.are preferably "pivotally mounted on their respective jaws '6' at a point preferably-about half way of the length thereof by headed over pivot pins llpa'ssing through the rear -portions of said arms 9 and the adjacent portion of the said-jaws 6 respectively. 4 Said arms have operative faces converging outwardly on a low angle from their forward and rear ends to a point adj acent aline perpendicular to the flanges Sand intersecting the axis of the circular opening 7 between thetwo jaws 6 when the arms 9 are in contact at their forward ends with said flanges 8 re spectively',:and so that when the said jaws 9 have been turned on their pivot'pins 11 to hold the locking elements E' therein, said point of convergencexwill' lie very close to or will be intersectedbysaid line or lines, perpendicularto the respective jaws 6 and in-' tersecting the axis or axes of the locking elements E, whereby the straight faces ofisaid arms 9 diverging at the same degree from said point will engage thesaid lockingelements E at equidistant points to the front and rear of their axes respectively and so center said elements E with relation to the centers of notches 7 respectively and maintain said-elements to their valve-stem 'B,as illustrated in Figs. 1, 4 and 7.

- In theembodiment illustrated a relatively strong long U-shape'or hairpin form spring 1-2 is arranged with its closed end disposed about thespacer or washer 4 and has arms extending forwardly therefrom, said arms being {bent abruptly toward each other against said washer 4 so as to extend appreciably more than 180 degrees about said washer, whereby said spring 12 will be securely maintained in place. i The arms of said spring 12 extend in the respective jaws 6 lengthwise thereof and bear against the laterally *outer faces of arms 9 in advance of pivot pins 11 respectively to forcesaid arms 9 toward some part of the respective flanges 8 thereof, or some definite part rigid with the respective jaws 6 to force said jaws together to closed position.

The. particular form of spring, considering our invention in one of its broader aspects, is not essential, nor is it essential that the one spring shall perform the dual functions of pressing the arms 9 toward the flanges 8 of the jaws 6 respectively and of closing the said jaws 6, nor is it essential that self-acting means for closing the jaws be provided.

The upper side or web of the jaws 6 will preferably be cut away at'a point adjacent the rear end of the flanges 8 as illustrated for the purpose of giving greater accessibility to the spring-pressed or yielding arms 9'and facilitating the insertion of the locking elements E.

However, the greater portion of the back or bridge will be left at the outer edges in the form of bracing flanges 10. a

Closely adjacent to the lugs 1 and 2 the respective handles 5' preferably will be formed with "opposed limiting or stop lugs 5, the lugs 5 of the two levers 5 registering ina lateral direction and being adapted to abut, as illustrated in Fig. 4, to prevent unnecessary strain on, or spreadingof, the arms o'r'loop of spring 12 and unnecessary wear on, or frictional contact between, the handles 5 at this point. r

In use, the lockingelements E are inserted in the respective jaws 6 between the springpresse'd arms 9 and the cooperating flanges 8 with their ends engaging the flanges 8 on opposite sides of the notch 7, and supported by the upper faces of the respective jaws 6, all asillustrated in Figs. 1. and 4. With the elements E thus held by the jaws 6 the front end of the tool is inserted through the usual access opening or port and between the jaws of a valve-spring lifter, the jaws 6 being spread to straddle the valve-stem B, when the grip on the handles or levers 5 is released to permit the jaws 6 to close on the reduced portion F of the valve, applying the locking elements E against the opposite sides. thereof. At this stage the central vertical line of the elements E will usually be disposed at an angle to the axis of the particular valve-stem nuance B, so the handles 5 will need to be raised until thecommon central line of the elements E is parallel with the axis of the particular valvestem B and the bottoms of said elements E are parallel to, extend radially inward of, and rest flatly on the upper face of lower annular shoulder G. I

Where opposed upper and lower annular shoulders similar to G are present the task is a little more exacting, as the elements E must fit between said opposed shoulders in or der that they may move radially inward to the correct position. 7

Whensaid tool has been manipulated to correctly position the elements E, it may be released, if desired, and the spring 12 pressing the arms 9 toward the flanges 8 respectively will holdthe jaws 6 together with 'sufiicient pressure to prevent their relative movement under the opposed weight and leverage of the tool. However, whether said tool be released or a grip thereon retained, the mechanic, after the proper positioning of the elements E, next in order operates the valvespring lifter LI to permit the descent of the spring retainer D under the pressure of the spring C, said retainer D receiving the elements E in its cooperating cone-shape recess orbore concentric with the valve-stem B, and tends to force them radially toward each other, as well as endwise toward and against the lower annular shoulder G, in its descent striking against the spring-pressed or yielding arms 9 and shoving the latter and the jaws 6 downward toward the push rod J below the upper face of annular shoulder G, so stripping the locking elements Eofrom the jaws 6 of the tool and forcing them firmly into their proper position to cooperate with the valve-stem B and retainer D. o

The mechanic then presses the handles or levers 5 toward each other to spread the jaws 6 to permit the withdrawal of the jaws 6 from about the valve-stem B.

Of course, it will happen sometimes that the elements E are not properly positioned, orthe retainer D will be prematurely lowered, so forcing the elements E out of the jaws 6 without their being held between the retainer D and stem B; and we, therefore, prefer to use the shield N as a precautionary measure to catch the elements E should they be forced from the jaws 6 and drop toward the push-rod spider H.

The handles 5 will preferably have the rear end portions of their lateral portions or bottom of the channel formed with a plurality of serrations 5 to reinforce said handles so that even though said handles are of quite thin material they will withstand great weight and abuse and als'oso as to provide a roughened grip portion. The serrations 5 may be formed by slitting the metal between each two serrations and bending or twisting the material of each serration to lie at an appreciable angle tothe longitudinal central line of the tool, all as illustrated in Fig. 3. i

We claim: j 1. A valve-stem locking-element inserting tool comprising a pair of sheet metal members each comprising a pair of vertically reg- 1sterin g laterally presented lugs, a handle portion extending to the rear, of said lugs and a jaw portion extending forwardly of said lugs, said jaw portions having their opposed inner edges ad acent their front endsnotched out in registry to cooperate in definingbe- 'tweenthem, in closed position, an opening,

to receive the valve-stem, stop means carried by said'jaw portions respectively to be engaged by the respective locking elements, a pivot-pin extending through said laterally presented lugs to pivotally connect said members, and laterally presented stop lugs carried by said handle portions, the stop lugs ofone said handle portion registering ina lateral direction with the stop lugs of the other said handle portion and being adapted to abut therewith to limit the movement of said handle portions, in combination with a pair of arms respectively pivotally mounted on the respective jaw portions for swinging movement toward and from the stop means of saidaw portions respectively,

and a springextending about said pivot-pin and having portions extending lengthwise of said arms and respectively engaging said arms in advance of their-points of pivotal mounting respectively to yieldingly press said arms toward their cooperating stop means of the respective jaw portions and act ing to press the latter toward closed position, and eaclrsaid pivoted arm being formed with longitudinally extending faces diverging laterally inwardly from their extreme laterally outer point of intersection adjacent a transverse plane extending at right angles to said jaws and intersecting the axis of the opening defined, between said jaws in closed position, said diverging faces of the respective arms being adapted to engage the up wardly. inclinedouter faces of the respective locking elements to force them lengthwiseof the respective jaw portions to proper position and'to force them against said stop means, and also at right angles thereto against the top faces of said jaw portions re-- spectively; 2. A"valve-stem locking-element inserting tool comprising a pairof sheet metal mem' bers eachcomprising alaterally presented lug, a handle port-ionextending to the rear of said lugs and aw portion extending forwardly of saidlug, 'said jaw portions having'their opposed inner edges adjacent their front ends notched out in registry to cooperate in. defining between them, inclosed posi-' .tion, an opening to receive the valve-stem, stop means carried by said awportlons respectively to be engaged by the respective arms and respectively engaging said arms to yieldingly press said arms toward their cooperating stop means'of the respective jaw portions and acting to press the latter toward closed position, and each said pivoted v arm being formed with longitudinally extending faces diverging laterally inwardly from their extreme laterally outerpoint of intersection adjacent a transverse plane extending at right angles to said jaws andin' tersecting the axis of the opening defined be tween saidjaws in closed position, said divergingfaces of the respective arms-being adapted to engage the upwardly inclined outer faces of the respective locking elements to force them lengthwise of the respective jaw portions to proper position and to force them against said stop means, and also at right angles thereto-against the top faces of said aw portions respectively.

tool comprising a pair of sheet metal members each comprising a laterally presented lug, a handle portion extending to the rear of said lug and'a jaw extending forwardly;

of said lug, said jaw portions having their opposed inner edges adjacent their front ends notched out in registry to cooperate in defining between them, in closed position,

3. A valve-stem locking-element inserting P an opening to receive the valve-stem, stop ,e

means carried by said jaw portions respectively to be engaged by the respective locking elements, and a pivot-pin extending through said laterally presented lugs to pivotally connect said members, in combination with a pair of arms respectively mounted for movement toward and from the stop means-of said jaw portions respectively, and a spring extending about sald pivot-pin and having portions extending lengthwise of'said'arms a and respectively engaging said arms to yield; ingly press said arms toward their cooperatng stop means of the respective jaw portions and acting Vtopress the latter toward closed position, and each said'arm being adapted to engage the upwardly inclined outer facesof the'respective locking elements to force them lengthwise of the respective jaw portions to proper position and to force them against said stop means, and also at right angles thereto againstthe top faces of said jaw portions respectively.

4. A valve-stem locking-element inserting 'tool comprising a pair of sheet metal members each comprising a laterally presented.

lug, a handle portion extending to the rear of said lugs and a jaw portion extending for wardly of said lug, said jaw portions having their opposed inner edges adjacent their front ends notched out in registry to cooperate in defining between them, in closed position, an opening to receive the valve-stem, stop means carried by said jaw portions respectively to be engaged by the respective locking elements, and a pivot-pin extending through said laterally presented lugs to pivotally connect said members, in combination with a pair of arms mounted for movement toward and from the stop means of said jaw portions respectively, and a spring extending about said pivot-pin and having portions extending lengthwise of said arms and respectively engaging said arms to yieldingly press said arms toward their cooperating stop means of the respective jaw portions and acting to press the latter toward closedposition, and each of said arms being adapted to engage the outer faces of the respective locking elements to force them a ainst said stop means.

5,. A valve-stem locking-element inserting tool comprising a pair of sheet metal members each comprising a laterally presented lug, a handle portion extending to the rear of said lug and a aw portion extending forwardly of said lug, said jaw portions having their opposed inner edges adjacenttheir front ends notched out in registry to cooperate in defining between them, in closed position, an opening to receive the valve-stem, stop means carried by said jaw portions respectively to be engaged by "the respective locking elements, and a pivot-pin extending through said laterally presented lug to pivotally connect said members, in combination with a pair of arms respectively moiintedfor movemen's-toward and from the stop means of said jaw' portions respectively, and means respectively en aging said arms to press said arms toward their cooperating stop means of the respective jaw portions, said arms being adapted to engage the outer faces of the respective locking elements to force them against said stop means.

6. A valve-stem locking elcment inserting tool comprising a pair of sheet metal members each comprising a laterally presented lug, a handle portion extending to the rear of said lug and a jaw portion extending forwardly of said lug, said jaw portions having-their opposed inner edges adjacent their front ends notched out in registry to cooperate in definingbetween them, in closed position, an opening to receive the valve-stem, stop means car-- ried by said jaw portions respectively to be engaged by the respective locking elements, and a pivot-pin extending through said laterally presented lugs to pivotally connect said members, and laterally presented stop lugs carried by said handle portions, the stop lugs of one said handle portion registering in a lateral direction with the stop lugs of the other ones 7, A pesitionin tool comp inga pivotpin, and a pair of levers pivoted togetherby said pin and including handles on one side of the pivot-pin, and jaws on he oppos te side of said pivot-pin arranged to move away from each other as the handles. are moved together, said jaws being formed to define an opening between them when in closed position, in combination with stop means carried by said j aws, arms pivotally mounted on the respective jaws for swinging movement to.- ward and from said stop means of said jaws respectively and adapted to press against said stop means the elements to be positioned, and yielding means extending about said pivotpin and bearing on the laterally outer portions of said arms to yielding-1y press the latter toward their cooperating stop means and to hold the respective elements to be positioned between the respective arms and their cooperating stop means and to press said jaws toward each other to closed position.

8. A positioning tool comprising a pivotpin, and a pair of levers pivoted together by said pin and including handles on one side of the pivot-pin and jaws on the opposite side of said pivot pin arranged to move away from each other as the handles are moved together, said aws being formed to. define an opening between them when in closed position, in combinati on with stop means carried by saidjaws,

arms mounted for swinging movement to.- ward and from said stop means of said jaws respectively and adapted to press againstsaid stop means the elements to be positioned, and ielding means extending about said pivotpin and bearing on the laterally outer portions of said arms to yieldinglypress the latter toward their cooperating stop means and to hold the respective elements'to be positioned between the respective arms and their cooperating stop means and to press said jaws toward each other to closed position. 9. A positioning tool comprising a pivotpin, and a pair of levers pivoted together by said pin and including handles on one side of the pivot-pin and aws on thevopposite side of saidpivot-pin arranged to move away from each other as the handles are moved together, said jaws being formed to define an opening between them when in closed position, in combination with stop means on the inner edge portions of said jaws and facing outward, arms mounted for movement toward and from said stop means of said jaws respectively and adapted to press against said stop means theelements to be positioned, and yielding means respectively bearing on the laterally outer portions of said arms to yieldinglypress the latter 5 toward their cooperating stop means and to hold the respective elements to be positioned between the respective arms and their cooperating stopmeans.

10. A positionin tool comprising a pivotpin, and a pair levers pivoted together by said pin and including handles on one side of the pivot-pin and jaws on the opposite side of said pivot-pin arranged to move away from each other as the handles are moved together, said jaws being formed to define an opening between them when in closed position, in combination with stop means on the inner edge portions of said jaws and facing outward, arms pivotally 90 mounted on the respective jaws for swinging movement toward and from said stopmeans of said jaws respectively and adapted to press against said stop means the elements to be positioned, and resilient means v respectively engaging said arms to yieldingly press the latter toward their cooper-- ating stop means and to hold the respective elements to be positoned between the respective arms and their cooperating stop means. so 11. A positioning tool comprising a pivotpin, and a pair of levers pivoted together by said pin and including handles on one side of the pivot-pin and aws on the opposite side of said pivot-pin arranged to move away from each other as the handles are moved together, said jaws being formed to define an opening between them when in closed position, in combination with stop means on the inner edge portions of said j aws and facing outward, arms mounted for movement toward and from said stop means of said jaws respectively and adapted to press against said stop means the elements to be positioned, and means extending about said pivot-pin and respectively engaging said' arms to yieldingly press the latter toward their cooperating stop means and to hold the respective elements to be positioned between the respective arms and their cooperating so stop means.

In testimony whereof, we have signed our names to this specification at Lancaster, Pennsylvania, this 24th day of May, 1930.

HARRY W. KULP. as MARTIN C. DELLINGER.

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