US2581262A - Tool for driving and setting blind fasteners - Google Patents

Description

Jan. 1, 1952 J. c. LANG 2,581,262

TOOL FOR DRIVING AND SETTING BLIND FASTENERS Filed Feb. 27, 1948 5 Sheets-Sheet l Mia/5W4,

ATTORNEYS Jan. 1, 1952 J. c. LANG 2,581,262

TOOL. FOR DRIVING AND SETTING BLIND FASTENERS Filed Feb. 27, 1943 5 Sheets-s 2 .INV ENTOR" 1566M (za ATTORNEYS J. c. LANG 2,581,262 TOOL. FOR DRIVING AND SETTING BLIND FASTENERS I Jan. 1, 1952 3 Sheets-Sheet 5 Filed Feb. 27, 1948 INVENTOR Jsepiz Clan; BY

ATTORNEYS WMWW, e

Patented Jan. I, 1952 1 flGOL'FORfDRIVIN G AND SETTING BLIND-FASTENERS Jqs ph Lang: B tt bu rl ia s i mr I -B991 1. .0 iq iittshu R mlany nonation t D s s a l? 7 Application Eebruaz yi27, 1948, Serial N10. 11 5.67 "6 Qm ms- ZQWLQL 1 inv n i n is for tqql fo er vin anq se i g-.s ee el to d .t asteners :Q th im: whe ei'm m ast-c1 ..1s fi z tmd ri eni and. then a q ti wqf n l.e. i Peek 2 Whil ename mtti s .hel ista eea-xyat iefie aav ee rma i i the aste er ie. sbsen Lrv n v 51. wheeeinihe XQ .le il Whi 15th Til i pmyiqe s s. s e .s v miners-a e eaitenma 14 m ioe tes t l9 abqvmnen sq -.an1-ihe7 ai e in sm m w 1? o V theexe ssl ngihs 9f the stem.

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ti p rtposition shown in Fig. 2, the detent l3 and concavity H are out of engagement and the lever 8 may be rocked freely. When the lever is pulled back to the position shown in Fig. '7, the detent l3 will spring into the socket l4 forming a means for holdin the handle 8 against free movement. This detent means, while effective to prevent the free swinging of the lever 8, is yieldable so that the parts 8 may be readily engaged and disengaged.

The lower end of the head has a downwardlyextending projection 3a through which passes a transverse pin 15. This pin serves as a pivot to connect two opposite jaw elements 16 and I! of a presser foot to the head. These jaw elements are of a substantial length so as to extend for a considerable distance over the surface of the work and distribute pressures therealong in the manner hereinafter more fully described. The jaw element I6 is of angle form in transverse section, having an in-turned horizontal flange 16a and an up-turned vertical flange 16b. Intermediate its ends the vertical flange It has an upwardly-projecting extension l8 through which the pivot pin l passes. This projection extends, however, above the pivot and is provided near its upper end with a detent element 19 similar to the detent described. It is arranged for cooperation with a recess on the face of the head of the implement. In addition to the recess 20, there is another recess 20'. In Fig. 2 the projection I9 is engaged in the recess 20 to releasably hold the parts in the position shown, while in Fig. l the detent i9 is engaged in the recess 20. The other jaw I1 is formed similarly to the jaw 16 with an in-turned horizontal flange Ila and an upturned flange 11b, and with an ear l'lc corresponding to the projection I8, the pivot pin 15 passing through this ear. However the detent arrangement need be provided at only one side of the structure and consequently the ear He is of less vertical height than the extension 18 on the opposite jaw. The two jaws, being thus pivoted, provide a bifurcated pressure foot at the end of the tool adapted to be placed against the work and with respect to which the head may rock.

The inwardly-turned horizontal flanges Ilia and Na of the jaws are provided at 2| with opposed cutting edges, these cutting edges being relatively short as compared to the total length of the jaws.

The vertical flanges of the jaws are also each provided with upwardly-extending arms 22 and 23 respectively, these arms having inwardlyturned overlapping ears 24 thereon through which a pivot pin 25 passes. The arms also have inwardly-turned upper ends 26 which are beveled as shown in Figs. 5 and 8. The inwardlyturned portions 26 normally contact each other as shown in Fig. 5, at which time the cutting edges 21 are spread apart, also as shown in Fig. 5.

A lever 28 is also pivoted on the pin I5 between the two metal plates that form the head. At one end of this lever is a wedge-shaped extension 29 that extends under the over-turned arms 26 of the extensions 22 on the jaws. The other end of the lever is provided with an extension 30 which has an adjustable set screw 3! thereon. This set screw is arranged to cooperate with a transverse pin 32 in the head. By adjusting the screw 3| the range of free movement of the head relatively to the lever may be varied.

The operation of the device may now be exelement 13 previously plained. The lever 8 is held from free motion by its detent, and the pivoted presser foot comprising the two jaws l6 and i1 is also looked against free swinging movement by reason of the detent 19. The implement is then used as a hammer to drive the fastener. After the fastener has been driven, the tool is inverted and the center pin is engaged between the two jaws forwardly of the cutting edges 2|. The jaws may be provided at the end remote from the fastenerengaging end with downwardly-projecting pads as indicated at 33, so that when the forward ends of the jaws are resting on the head-forming elements of the fastener, the jaws will be horizontal. The pressure is thus distributed to some extent over the surface of the asbestos shingle or other article.

At the time of engaging the pin with the jaws, the parts are in the position shown in Fig. 1. The handle 2 of the implement is then rocked to the left from the position shown in Fig. l to the position shown in Fig. 2. Then the lever B is moved to the left from the position shown in Fig. 1 to the position shown in Fig. 2. This causes the projecting end of the pin to be clamped between the serrations ll of the curved extension I!) and the pressure plate 1. When the end of the pin has been thus clamped, the handle 2 is moved toward the right. This serves to pull the pin upwardly while the under faces of the jaws, bearing against the head-forming part of the fastener, keep the fastener as a whole from pulling out. When the parts have reached the position shown in Fig. 4, the fastener will have been set. Thereupon the lever 8 is operated to disengage the end In from the upper end of the pin. The tool is then shifted slightly to the left so that the protruding end of the pin will be then located between the cutting edges 2i of the two jaws. Thereafter the head of the hammer is tilted over toward the final position shown in Fig. '7. In this final rocking or tilting of the head, the pin or abutment 32 will strike the end of the adjustable screw 3| on the extension 30 of the lever 28. This causes the lever 28 to rock on its pivot, whereupon the wedge-shaped projection 29 will move from the position shown in Fig. 5 below the two overhanging arms 26, upwardly between the beveled ends of these arms. This will force the two jaws together, the jaws rocking on the pin 25. As the two jaws come together, the cutting surfaces 2| will sever the upper end of the pin. The parts are then all in position to begin the next driving and setting operation.

It will be seen that in the use of the tool the pressure used in rocking the head of the hammer to draw the stem of the fastener outwardly automatically reacts against the over-turnedends of the side bars of the fastener to keep the fastener as a whole from pulling out. The tool is also a convenient form of tool to use. The handle 2 is usually manipulated in one hand. After the operator has driven the nail, his other hand is free to manipulate the lever 8. The en'- tire operation of driving, setting the fastener, and cutting off, can be accomplished veryquickly. The tool itself, while being of rugged construction, is relatively simple and inexpensive to manufacture.

While I have shown and described one particular form of tool, it will be understood that various changes and modifications maybe made within the contemplationof my invention andv under the scope of the following claims.

I claim:

1. For use in connection with a fastener that has a head and a stem relatively movable to the head and connections between the head and the stem which are bowed outwardly when such relative movement between the head and the stem is effected, an implement comprising a presser foot member bifurcated so that the presser foot member may rest on the head of such a fastener while the stem may be received and pass through the bifurcation thereof, an elongated handle member with the presser foot member located at one end thereof, the adjacent end of the handle member and the foot being connected for relative tilting movement about an axis transverse to the longitudinal axis of the handle member, and a lateral extension on the handle member having a clamp that overhangs the bifurcated end of the presser foot member for releasably engaging the stem of such a fastener when the presser foot is engaged against the head of the fastener and the stem is between the bifurcated portions thereof, relative pivoting movement between the handle member and the foot member serving to move the clamp relative to the foot and thereby impart relative motion to the stem of the fastener.

2. An implement as defined in claim 1, wherein the clamp comprises a flat terminal portion of said lateral extension as one clamping element and a pivoted lever on said extension having a serrated face opposed to the face of said terminal as the other clamping element.

3. An implement as defined in claim 1 wherein the handle member has a second lateral extension extending in a direction opposed to the first, said second lateral extension having a solid plane face at the terminal thereof spaced from and projecting beyond the end of the presser foot forming a striking face with which fasteners may be hammered into the surface in which they are used.

4. An implement as defined in claim 1 wherein the bifurcated end of the presser foot is comprised of two parts which may be moved toward and away from each other, said parts being pro- 'tener by shifting the 6 vided with opposed cutting knives that may be brought into engagement with the stem of a faspresser foot over the head of the fastener until the stem is between such knives.

5. An implement as defined in claim 1 wherein the bifurcated end of the presser foot is comprised of two parts which may be moved toward and away from each other, said parts being provided with opposed cutting knives that may be brought into engagement with the stem of a fastener by shifting the presser foot over the head of the fastener until the stem is between such knives, and means for moving the cutting knives toward each other by moving said handle member through a predetermined arc relative to the presser foot.

6. An implement as defined in claim 1 wherein the bifurcated end of the presser foot is comprised of two parts which may be moved toward and away from each other, said parts being provided with opposed cutting knives that may be brought into engagement with the stem of a fastener by shifting the presser foot over the head of the fastener until the stem is between such knives, there being a lever pivotally mounted on the presser foot, cooperating means on the lever and handle for forcing the knives toward each other when the lever is moved, and means on the handle member for engaging said lever to operate it to move the knives when the handle is moved through a presser are relative to the presser foot member.

JOSEPH C. LANG.

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

UNITED STATES PATENTS Number Name Date 91,452 Knaus Jan. 15, 1869 1,381,683 Weinbeer June 14, 1921 2,428,458 Hollwarth Oct. 7, 1947 2,447,589 Mellerio Aug. 24, 1948

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