US2456532A - Rod bender - Google Patents

Description

Dec. 14, 1948. i p, L, PERAZZQ- 2,456,532

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INVENTOR ATTORNEY Dec. 14, 194s. F. L'. PERAZZO 2,456,532

ROD BENDER Filed Deo. l, 1945 2 Sheets-Sheet 2v 3T- Q I BYPETERLPERAZZO W WHW? ATTORN EY Patented Dec. 14, 1948 UNITED STATES .PATENT OFFICE ItQD BEND'Elt Beter L. Perazzo, Napa, Calif. ernreerapaember 1, 1era Serie! Ne weer 5Claiins (Cl. 153-15) .ne initially inerme-diera @retailers 'with rods or bars to provide various bends therein.

An ebieet ef the ini/entiere ie ie arend@ e Perticularly effective hand-operated rod bender for its purposes.

ree haar m which lall bending opera to .provide va 4Qu'sly beni fede er here 2e eifee.v ley eee ef the The inventien Peeeeeeeeethereleieete er@ feetures of advantage; `3Sone of which' ith the fore- Wm be ser fg th or be a y lowing description Q A iment therenying vdra ngs, in which: Fgkue 1 is@ 99W?? 4 I embeelyiee my invetee er@ eereiiieeeeer feceiving a straight yxuroi or `bar Lfor the bending Figure 2 is e plan view af the Feeder, a .erregt-i rod to vbe bent being fragmentarily sho n as posi- Figures 3 and fl are enlarged sectional views of the bender et the lineai I. respectively,

bearing sleeve of the bender.

Figure Bis a fragmentary section of a bearing about a former of be i' Figures I7 to 14 inclusive are straight rod to provide an therein, as exemplifying typte' AS periiealarly illustrates, .e render ,l l embedying the' features .ef er. ent .ier/eerie? eemerisee eri?, e member .I3 which iisv base l? at a pivot bolt I4. The base IA tom withv ears l5L extending'i it and provided with b lt of the heee l? .1S .eier'eel'et' ia line thereof to provide flat upp The invention relates lto a device for shaping Another object is to provide a same bending unit.

going, '1 t, @l ieee, nf in iie'roleivpieeflj er1 of, and inthe accompa Y M y n i tive ai a red eender thereof.

tioned on the bender for ari initial gf'tliere- 3 dQQiri Eigurez Figure 5 is en enlarged eereeeelre view of e sleeve axially removed 4from its" "normal position ing the successive steps of be the bender.

an anvil or base inem I Y ngi a lever arm te to g ;i,

tangular `form lnplan vand i ing it to a worlf; bench grot ally parallell faces I5 ang 'i8 A,es

' tivelv The v .|3 supported:

leerde it fThe upright ,seep faee ,ereriaee between the mutually vel-F1330?. .t @$15595 if ih? lippe? @Hd low?? base faces ,I6 and has mutuaily'oi'set plane porQnSI tu??? L? Whew Pien YieWeehQ-W- connected by .a CY- 2 v appropriately cored out from beneath to lessen its'weight, and the curved'portion r23 of the step face comprises an extension of one side 'of' a g'enforally velliptical opening`24 extending between the lower base face VI3 andv a coremspa'ce'-25 "in"I the base bottom.y The opening 2,4 isarranged to provide for the gravity'renioval andescap'e f s'cal'e`or other extraneous matter frornth'e base face I8 as the head vI'Il is more orlessswung across it from over the" face YI8 to 'swfeep'th' matter intoit l Y rThe pivot bolt i4 has its head fully countersunk in the top of the member I3,v extends through the lower base portion providing the facev i8; and is secured by a primary nut 21 and a locknut 2-1?, the Vpivot bolt being approximately stepped to a larger size at and above the plane of th facev I"8 to prevent an undue tightening of the hinge'joint provided by it. At the end thereof oppo's'ivfits pivotal axis, the arm head yrnernbuer'i'l i 'pr'ovid`d with a socket 28 of uniform polygonal 'crosss'ction for removably and complementarilyreceiying one end of an extension bar 23 of suitable length for providing the leverage requiredforthe bending ofy a rod or bar with the present'lever arm. Mutually opposed annular grooves 30 in the under face of the arm head IT and in 'the baserace co-axially and jointly receive La sealing ring 30 of felt or the like for preventing'the'paf'sfsage of grit from the face into the pin bearings 1tY will now be noted that the head I1 4of the lever arm member I3 has a cylindrically convex end facportion 3| which is concentric with the pivot bolt axis, and is tangent to flat face portions r 32 and 33 extending to mutually parallel sideface portions 34 and 35 of the head and making`equal angles therewith, wherebyfthe head portion'adr jacent the pivot bolt I4 is symmetrical to a plane through the pivot axis andparalle'l to the side head faces 34 and 35. The portion of the head I'Il'whilch provides the socket`28 for receiving'thfe actuating bar 29 is somewhat narrowerthn is the head between its faces 34 and 35, isy bounded onV one side' by a continuation of the face 35;l yand has'its 'other side face 36paralle'l ytothe V'face'35 and connected with the face 33 of the head by van obliquely extending lface 3l.

VIn thepresent structure, the step face portions 2| and'22 and 23 aresorelated to the head for'h and the axis of pivoting of the member I3'tdhat`t I the head edge faces 34 and 33 may respectively be disposed `flat "against the step faces l2| and l22 as stops which determine 'the operative range Yof the member lf3. The'arrangementi'ssiich that the swinging range of the member "I3mbtwfri its limiting'positions against thebase fcs'] and'22 is about one hundred sixty degreslw'hlso, as is hereinafter brought out, the possible'swin'g ing of themember I3 from theposi'ti' sho'wn'i'or it ip Figurer toward arranging positiofragai t structure, pins 4I and 42 and 43 are mounted in v the head i1 to extend perpendicularly from its upper face I9, the plane of the pins 4| and42 being perpendicular to the plane of the head face 35, and the plane of the pins 42 and 43 being parallel to that of the face 35 whereby the pins f are in a rectangular L-shaped arrangement. Also, the pins 4| and 43 are at like distances from the pin 42, and the pins 4| and 42 are equally spaced from the aforesaid longitudinal plane of thehead through the pivot bolt axis, whereby they are also equally spaced from the latter axis. It is to be further noted that the plane of the pins 4| and 42 lies at the handle side of the axis of swinging of the lever arm at a distance from said axis which approximates the clearance between the opposed pin faces, while the pin 43 lies at the handle side of said plane.

The base I2 provides upstanding former pins 44 and 45 and 46 and 41. Pins 44 and 45 and 46 are disposed in a common plane which is perpendicular to the side faces of the base, and the pins 44 and 43 are substantially tangent to the step face portion 2|. The pins 46 and 41 dene a plane which is parallel to the side faces of the base, and is therefore perpendicular to the plane of the pins 44 and 45 and 46, it being particularly noted that the plane of the pins 46 and 41 is arranged to be coplanar with that of the head pins 42 and 43 when the head is disposed in the position shown for it in Figure 2. The mutual sparcing of the pins 45 and 45 and 41 of this L-shaped arrangement of pins on the base is the same as that for the - pins 4I and 42 and 43 of the lever arm, and the pin-spacing distance slightly exceeds the width of the largest rod to be laterally bent with the present bender.

The various pins 4I to 41 inclusive are of like diameter, and have reduced bases which are xed in complementary sockets extending into the base andhead from their top faces; each pin base may have a driving fit in its socket. The extending portions of the pins 46 and 41 rotatably mount bearing sleeves 48 having the same exterior diameters as the other pins, and being retained on their pins by means of heads 46 and 41 of the different pins; the pins 46 and 41 are provided with exterior bearing sleeves because a rod )being bent must move longitudinally while engaging kthese pins, as will hereinafter be apparent. It will be understood that all of the pins are eccentric to the pivotal axis of the lever arm.

Having the bender base I2 and arm I3 related as in Figure 2 wherein the former pins 46 and 41 and 42 and 43 are in generally coplanar relation, a straight rod R to be bent is disposed between theaforesaid array of pins and the pins 45 and 4I, with the rod point at which a bend is to be provided disposed opposite the pin 4l the present rod R is shown as of circular cross-section, but may comprise a bar of polygonal cross-section. With a rod R so disposed, a rocking of the arm I3 to swing it to move its face 35 forwardly toward the step face 2| of the base is arranged to elfect the bending of the rod around the pin 4| as a template, with the interior bend radius determined by the size of the pin 4I, it being understood that a right-angle or acute-angle bend in a rod or bar cannot have its inside too sharp because the material at the outside of the bend would then lbe so weakened'as t0 provide a bend lacking in requisite strength.

By way of illustrating possible bending operations with the present bender, Figures '7 to 14 disclose a specific succession of bending steps by which a rod R may be bent to provide an eye R atan intermediate point thereof. The eye bend R may be the only bend produced in the rod, or may be one of several like or diierent types of bends.

Referring specifically to the bending of a rod R to. finally provide the eye R, Figure 7 is seen to disclosea relation of the arm I3 to the base I2 in which the rod is rst positively engaged for bending it 4around the pin 4|, the arm I3 having been pulled slightly forwardly, and the rod then being engaged only by the pin 46 ofthe base and by the pins 4| and 43 of the arm; if the rod portion extending from the point of bending toward the pins 46 and 41 is too short to reach `the base pin 4 6, it may engage the base pin 41. ,Having the rod'R engaged by the three former pins 46 and 4| and 43 as described, the handle I3 is pulled forwardly to provvide a desired degree of bending which, with the, present arrangement of bending pins, may be anything from a small angle to an angle which is somewhat greater than a right-angle when the rod is released from the bender. Recallingthat rods of most materials are more or less resilient, it will be, understood that sucha rod must be over-bent while engaged by the bender, 3 y

Figure`8 discloses the relation of the bender elementsto .the rod R which has been bent: to provide a right-angle bend; because of the swinging of the pin 4I` toward the pin 41 as the bend is formed, the rod portion opposite the pin 41Y is finally brought against the latter pin rather than the pin 46. `In reference to the arcuate swinging of the pin '4I and the other pins 42 and 43with the lever arm I3, it will lbe understood that these pins compriseymovable, rather than xed, former pins or templates as the lever arm is actuated for a bendingv operation upon a rod engaging any of them. It is tobe noted that while an angular bend is being formed with the rod engaging a pin 46 or 41, an appreciable,longitudinal movement of the pin-engaging rod portion is eiected, this making the provisionof the bearing sleeves 48 on these pins particularly desirable.

Having provided. a substantially right-angled bend in the rod, lthe rodjis vremounted on the bender inthe position shown in Figure 9, wherein the pin 4I is disposed at the inside Icorner of the bend and the base pin 44 and armpin 43 are disposed at the outside of the diierent arms of the bend. A swinging forward of the arm I3 further bends the rod toward, the formation of a sharp V-bend approaching a U-bend when the arm reaches a limiting position determined by the engagement lofthe arm head i1 with the step face portion 2j of the base. As the arm is swung toward and beyond the position shown for it in Figure 10 the outer side of the bend may engage the base pin 41 and the arm pin 42 as aiding the sharpening ofthe bend about the pin 4i.

With the present arrangement of bending pins, the operation which is illustrated by Figures 9 and 10 has not produced a true U-bend, and the latter` may be effected byy mounting the bent rod in the man-ner shown in Figure l1 wherein the bend is looped around the base pin 41 and has its different legs engaging the arm pin 4l and the base pin 45. With the bent rod so mounted, a forward swinging of the arm may provide a true U-bend in which the sides are mutually parallel, as is indicated in dash lines in Figure 1l.. A continued forward swinging of the arm I3 to the position shown in Figure 12 will produce the half-eye bend shown in Figure i3. It will be noted that the present bending use of the arm I3 finally results in the cooperation of the base pin 45 and the arm pin 4l at substantially the same distance from the pin 41. Having formed the half-eye bend of Figure 13, an operator may turn the bend over the base pin 4'! with its legs be tween and engaged with the pins 44 and 4i, and rock the lever arm forwardly to complete the eye R. which was to be provided.

From a consideration of the foregoing illustrated manner of providing an eye in a rod or bar, it will be understood that the pins 4I to 4l inclusive are arranged to be variously utilized in bend-forming operations, and that the present bender may be otherwise applied to a rod or bar for providing one or more bends therein. Since the Various pins operate in a common plane upon a rod or bar resting upon the base and arm faces I6 and i9 respectively, it will be understood that a twisting of a rod being bent out of its plane of bending is practically impossible, whereby an operator may use the present bender with particular coniidence in the bending of rods to a specified degree or to a pattern.

From the foregoing description taken in connection with the accompanying drawings, the advantages of the construction and use of the present device will be readily understood by those skilled in the art to which this invention appertains. While I have described the features and principles of use of a rod bender which I now consider to comprise a preferred embodiment of my invention, I desire to have it understood that the showing is primarily illustrative, and that such changes and developments may be made, when desired, as fall within the scope of the following claims.

I claim:

1. In a rod bender, a base providing a flat upper face, former pins extending'upwardly from said base face, a lever arm mounted on said base for swinging about a fixed axis perpendicular to the upper base face and having a fiat upper face coplanar with said base face, and former pins extending from the upper face of said lever arm in eccentric relation to its axis of swinging, said former pins of the base and lever arm being so related as to engage a rod disposed upon said upper faces of the base and arm as the sole means for bending the rod about one of them as the lever arm is swung from the position it had when the rod was placed upon the base and lever arm.

2. In a rod bender, a base providing a flat upper face, an L-shaped line of mutually spaced former pins extending fixedly from said base, a lever arm having a head end portion pivoted on said base for a swinging of the arm about a fixed axis perpendicular to the upper base face and having a flat upper face coplanar with said base face, an L-shaped line of mutually spaced former pins extending xedly from said upper face of the lever arm head in eccentric relation to its axis of swinging, said former pins of the base and lever arm being so related as to cooperatively engage a rod disposed upon said upper faces of the base and arm head as the sole means for bending the rod about one of them by and upon a swinging of the lever arm from the position it had When the rod was placed upon the base and lever head.

3. In a rod bender, a base providing a dat upper face and arranged to be held in a iixed position, a plurality of mutually spaced former pins fixed to the base and extending upwardly from its upper face, a lever a-rm having a head end portion pivoted to said base for a swinging of the arm about a fixed axis perpendicular to the upper base face and having a flat upper face coplanar with said base face, and a plurality of mutually spaced former pins fixed to the arm head in eccentric relation to said axis of swinging for the arm and extending upwardly from the upper face of said arm head, diiierent combinations of at least three of said former pins of the base and arm head being so related as to cooperatively engage a. rod supportedly placed upon said upper faces of the base and head for bending the rod about a pin of a selected combination in a plane parallel to the plane of said base and head faces as the lever arm is swung from its original position.

4. In a rod bender, a base providing a nat outer face, a set of former pins extending transversely from said base face in xed relation to the base, a, hinge pin extending transversely from said base, a lever arm mounted on said hinge pin for swinging about the pin axis and having a flat outer face coplanar with said base face, and a set of mutually spaced former pins extending xedly from the lever in eccentric relation to the axis of swinging provided by the hinge pin, pins of the diierent sets being cooperative with a rod disposed against said outer faces of the base and arm as the sole means operative against the rod for bending it about one of the cooperative pins when the lever arm is swinging from the position it had when the rod was positioned for its bending.

5. A structure in accordance with claim 4 having the hinge pin extending no further from the base than said outer face of the mounted lever whereby a rod being bent may move across the hinging axis of the lever.

PETER L. PERAZZO.

REFERENCES CITED The following references are of record in the ille of this patent:

UNITED STATES PATENTS Number Name Date 519,812 Griswold May 15, 1894 997,364 Blackman July 11, 1911 1,174,143 Heinen Mar. 7, 1916 1,206,114 Jameton Nov. 28,1916

1,354,770 Little Oct. 5, 1920 1,598,513 Terhaar Aug. 31, 1926 1,610,201 Cavagnaro Dec. 7, 1926 1,824,244 Tideman Sept. 22, 1931 FOREIGN PATENTS Number Country Date 278,976 Germany Oct. 7, 1941 510,266 Germany Oct. 17, 1930 543,019 France May 24, 1922

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