US3016080A

US3016080A - Apparatus for bending terminals

Info

Publication number: US3016080A
Application number: US790255A
Authority: US
Inventors: William C Kent
Original assignee: Western Electric Co Inc
Current assignee: AT&T Corp
Priority date: 1959-01-30
Filing date: 1959-01-30
Publication date: 1962-01-09
Anticipated expiration: 1979-01-09

Description

Jan. 9, 1962 w. c. KENT APPARATUS FOR BENDING TERMINALS Filed Jan. so, 1959 Jan. 9, 1962 w. c. KENT 3,016,080

APPARATUS FOR BENDING TERMINALS Filed Jan. 30, 1959 5 Sheets-Sheet 2 57 CLC.

Jan. 9, 1962 n w. c. KENT APPARATUS FOR BENDING TERMINALS 5 Sheets-Sheet 3 Filed Jan. 50, 1959 LM WIN.

i w. f a S. 2

H M. a lllll /l Q Z f2 United States atet 3,016,080 APPARATUS FOR BENDING TERMINALS William C. Kent, Naperville, Ill., assigner to Western Electric Company, Incorporated, New York, N Y., a corporation of New York Filed Jan. 30, 1959, Ser. No. 790,255 11 Claims. (Cl. 153-21) This invention relates to an apparatus for bending terminals and more particularly, to an apparatus for bending one or more sets yof stacked spaced terminals on a single terminal assembly to a predetermined angle.

In the fabrication of certain terminal assemblies it is necessary to bend individual sets of stacked terminals, which are not aligned with other terminals Vof another set of terminals of the terminal assembly, to the same angle and in the same direction. In the past this was done by separately bending each terminal with a pair of pliers or by bending the terminals individually in a bending device. Procedures of this sort result in irregularities in successively produced terminal assemblies with corresponding reductions in strength and dependability of the terminal assemblies. It is therefore extremely important to be able to automatically and simultaneously bend all terminals of an individual set of stacked terminals of a terminal assembly, which are not aligned with other terminals on the terminal assembly, quickly and accurately with a high degree of dependability so as to produce a high quality terminal assembly having all terminals, of each individual set of terminals thereon, bent to the same angle and in the same direction.

It is the primary `object of this invention to provide an apparatus of simple and economical construction for automatically bending sets of terminals of a terminal assembly.

Another object of this invention resides in a pair of uncomplicated terminal bending elements which simultaneously bend all terminals f a set of stacked spaced terminals to a predetermined angle.

A further object of this invention is to provide an apparatus which will provide the necessary reciprocating movement of one bending element relative to another bending element, when sequentially operated, to bend a single set of terminals.

Still another object of this invention is to provide a valving arrangement to sequentially operate air operated means to sequentially operate several reciprocating apparatus.

An additional object of the invention is to provide an apparatus for automatically bending terminals of assem blies of diferent sizes and having a varied arrangement of misaligned sets of stacked terminals.

With these and other objects in View, the present invention contemplates a stationary jaw and a movable jaw slidably mounted adjacent thereto. A linkage is provided to reciprocate the movably mounted jaw in response to the reciprocation of a rod. A lever is pivotally mounted, at a central point thereof, to the rod with the ends of the lever extending laterally from the rod. An arrangement of yair cylinders is sequentially operated to alternately lock the ends of the lever. When the ends of the lever are alternately locked lthe other end is moved by an appropriate air cylinder to rotate the lever about its locked end to give-a reciprocating movement to the rod and thereby reciprocate the movable jaw to bend alternate sets of terminals placed between appropriate teeth of the jaws.

AOther objects, advantages and novel aspects of the invention will become apparent upon consideration of the following `detailed description, in conjunction with the accompanying drawings wherein: v

FIG. 1 is a plan view of the bending apparatus showing surfaces 3S and straight sides 36. The second bendingjaw 32 has an opening 37 therein and a ange 38 eX- 2 I l the interrelationship of bending linkages and actuating units therefor; l

FIG. 2 is a sectional view taken along line 2--2 of FIG. 1 showing actuating members for the workpiece stripping mechanism and jaws;

FIG. 3 is a sectional view takenal'ong line 3-3 of? FIG. l showing the reciprocating jaw with the jaw moved to` the left in response to the manually operated valving 5 Cam;

FIG. 4 is a perspective view of two terminal assem`-.

blies showing two sets of stacked termina-ls thereon before and after being bent;

FIG. 5 is a schematic view of the air system for actuating the apparatus showing the interrelationship of the actuated elements and the air supply and control valves therefor;

FIG. 6 is a side view of the bending apparatus showing the bending jaws and the operating links therefor;

FIG. 7 is a partial view of the bending jaws with thetermina'ls of the terminal assembly positioned between the teeth of the jaws showing the positions in which the' terminal assembly is placed to have the terminals thereof bent;

FIG. 8 illustrates the position of the terminals, and th stationary and reciprocating bending jaws after the rst set of terminals have been bent;

FIG. 9 illustrates the position of the terminals and the stationary and reciprocating bending jaws after the second set `of terminals have been bent;

FIG. 10 is a front view of the movable bending jaw showing the shape and position of the two sets of teeth thereof and the general shape of the jaw;

FIG. ll is a front view of the stationary bending jaws l showing the shape and position of ythe two sets of the teeth thereof and the general shape of the jaw; and

FIG. 12 is a partial sectional view taken along line 12-12 of FIG. 7 showing the relative positions of the jaws and the respective guide members therefor.

Referring to the drawings there is illustrated a terminal bending apparatus (FIGS. l, 2, 3 and 6) for a termi-l nal assembly, generally designated by the numeral 13,l

which has two or more individual sets of stacked terminals 14 and 15 which are not aligned with each other.; The apparatus has a base 16 with fa frame 17 secured thereto. The frame 17 has a jaw guide 18 rigidly 'securedx of the jaw 21 tted slidably in the channel 19 of the jaw l guide 18. y

A second jaw guide 31 is detachably mounted to thev frame 17 adjacent the jaw guide 18. A second bending jaw 32 is provided which has two identical sets of spaced teeth 33 and 34 formed therein which have tapered end tending along one side (FIGS. 11 and 12). The second jaw guide 31 also has a channel 39 (FIG. 6) -formedl therein to slidably receive the ilange 38 of the jaw 32. A

pin 40 is inserted through the opening 37 of the jaw.32

and into the detachably mounted-jaw guide 31 to secure the jaw 32 to the frame 17 adjacent the jaw Z1.

A pin 46 (FIG. 3) is rigidly mounted in the jaw guide 18 and extends across the opening 2.0 thereof. vAx lever 47 having a node 48 is pivotally mounted on thev stationary pin 46 so that the node 48 enters the recess 29 of the Patented Jan. 9, 1962 The jaw 21 is 3 jaW'Zl to'impart a reciprocating motion to the jaw 21, which is held slidably in the channel 19 of the jaw guide 18, when the lever 47 is pivoted about the stationary pin 46.

A rod 49having a pair of yokes S0` and 51 rigidly secured thereto is pivotally connected to the lever 47 by yoke 50 at 52 (FIGS. 2 and 3). A lever 53 is pivotally vconnected tothe yoke 51 on the rod 49 by a pin 54. A

pair of yokes 55 and 56 which have transverse slots 57 and 58 therethrough are pivotally connected to respective ends of the lever 53 by pins 59 and 60 which are inserted in the slots 57 and 58 of the yokes 55 and 56 and` secured to respective ends of the lever 53 (FIG. 1). The yokes 55 and 56 are rigidly mounted to spring biased piston rods 65 and 66 respectively which are actuated by a pair of air cylinders 67 and 68 respectively. Stop

members

69 and 70 are provided which are rigidly secured to the base 16 in the path of the yokes 55 and 56 respectively. A pair of air cylinders 71 and 72 are rigidly mounted to the base 16 adjacent respective paths of the yokes55' and 56 to alternately move spring biased blocks 73 and 74 into the path of the respective yokes 55 and 56 to prevent movement thereof.

A pair of valve actuating members 81 and 82 are adjustably mounted to the rod 49 by screws 83 inserted through projections 84 of the actuating members 81 and 82 positioned over the rod 49 and threaded into projections 85 of the actuating members 81 and 82 positioned under the rod 49. The screws 83 are used to draw the projections 84 and 85 together against the rod 49 to adjustably secure the actuating members 81 and 82 to the rod 49. The vertical frame 17 has an opening 86 therein through which the actuating members 81 and 82 project.

A valve 87 having a spring biased valve trigger 88 is rigidly mounted to the frame 17 with the trigger 88 in the path of the valve actuators 81 and 82 (FIGS. l, 3 and 6). The valve actuators 81 and 82 are positioned on the rod 49 so that the valve trigger 88 will be actuated by the valve actuator 82 when the rod 49 is moved all the Way to the left (FIG. 1) and again by the valve actuator 81 when the rod 49 is moved all the way to the right.

A stripping plate 96 (FIG. 2) is positioned on the jaw guide 31 and has pins 97 rigidly secured thereto. The pins 97 are slidably mounted in the frame 17 (FIG. 2) and are rigidly'connected by a cam follower 98. A cam 99 is pivotally mounted to a pin100 which is rigidly secured to the frame 17. The cam 99 is pivotally connected to a spring biased piston rod 101 (FIGS. 1 and 2) at 102. The piston rod 101 is reciprocably moved by an air cylinder 103 to oscillate the cam 99 about the pin 100. The oscillating movement of the cam 99 about the pin 100 will move a cam surface 104 of the cam 99 on the cam follower 98 to force the pins 97 and connected stripping plate 96 upwardly (FIG. 2) to strip the terminals'14 or 15 of the terminal assembly 13 out of the

jaws

21 and 32. l

A sequentially controlled air system is provided (FIG. for sequentially operating the bending and stripping elements. A manually operated control handle 111 (FIGS. 1, 2, 3 and 6) is rigidly secured to a hub 112 which is pivotally mounted on a pin 113. The pin 113 is rigidly'mountedto a verticalframe 114. The hubl 112 has cam surfaces 116 and 117 on one side thereof and 118 and 119 on the other side (FIGS. l, 3 and 6). The frame 114 has two sets of

valves

126, 127 and 128, 129 securely mounted thereto (FIGS. 1, 3 and 6) with their respective spring

biased triggers

130, 131 and 132, 133 in contact with the hub 112 in the path of the cam surfaces 116, 117 and 118, V119 respectively.

When the handle 111 is moved from position A to position B (FIGS. 1,-2, 3 and 5) the hub 112 is rotated counterclockwise and the cam surfaces 116 and 117 will move the valve triggers 130 and 131 in sequence to operate the operated first when handle 111 is moved to position B, admits air into the air cylinder 71 to rmove the spring biased block 73 into the path of the yoke 55 to lock the yoke 55 against movement. The valve 127 which is operated secondly when the lever 111 is moved to position B, admits air into the air cylinder 68 which moves the yoke 56 topivot the lever 53, which is held stationary by the yoke 56, clockwise about the pin 59 (FIG. 1). The movement thus produced will move the rod 49 t0 the right which will pivot the lever 47 counterclockwise about the pin 46 to move jaw 21 to the left, bending the terminals 14 which are positioned in the jaw teeth 22 and 33` (FIG. 7) of the

jaws

21 and 32 as illustrated in FIG. 8. Upon completion of this bending movement, the terminal assembly will be automatically ejected in response to the movement of the rod 49 as previously pointed out.

When the handle 111 is returned to position A from position B, air cylinders 71 and 68 are deactuated allowing the spring biased block 73 to retract from the path of the yoke 55 and allowing the spring biased piston rod 65 to pivot the lever 53 counterclockwise about the pin 59 in response to the spring biased piston rod 66.

vWhen the handle 111 is moved to position C from position A (FIGS. 1, 3 and 5) the valves 128 and 129 are sequentially operated by the cam surfaces 118 and 119 on the hub 112. The valve 12S, which is operated rst, admits air into the air cylinder 72 to cause it to move the spring biased block 74 into the path of the yoke 56 to lock the yoke 56 against movement. The valve 129, which is operated secondly when handle 111 is moved to position C, admits air into air cylinder 67 to move yoke 55 to pivot the lever 53 clockwise about pin 60 (FIG. 1). The movement thus created will move rod 49 to the left which will pivot lever 47 (FIG. 3) clockwise about pin 46 to move jaw 21 to the right to bend the terminals 15 positioned in the

jaw teeth

23 and 34 of the

jaws

21 and 32 as illustrated in FIG. 9. Upon completion of this bending movement, the terminal assembly will be automatically ejected in response to the movement of the rod 49 as previously pointed out.

Operation In operation, to bend two individual sets of stacked terminals of a terminal assembly to a single predetermined angle, a terminal assembly 13 is placed adjacent the bending

jaws

21 and 32 with the terminals 14 thereof positioned between the teeth 33 of the stationary jaw 32 and the teeth 22 of the reciprocating jaw 21 (FIG. 7). The handle 111 is then moved to position B (FIG. 3) to sequentially operate the

valves

126 and 127 which in turn sequential-ly admit air into the air cylinders 71 and 68 to sequentially move the spring biased block 73 and the piston rod 66. The block 73 which is thus moved rst moves into the path of the yoke 55 to look the yoke 55 against movement. The piston rod 66 then moves the yoke 56 to the right (FIG. l) which pivots the lever S3 clockwise about the pin 59 which in turn moves the rod 49 to the right. This movement of the rod 49 to the right pivots the lever 47 about pin 46 which moves the jaw 21 to the left (FIG. 3). This leftward movement of the jaw 21 will 'bend the terminals 14 to the left as shown in FIG. 8. v

At the end of the rightward movement of the rod 49 the valve actuator 81 vwill engage'v the valve trigger 88 to operate the valve 87 which will admit air into the air cylinder 103. The air cylinder 103 thereupon will move the spring biased piston rod 101 to pivot the cam 99 about the pin which will force the ejector plate 96 upwardly (FIG. 2) and remove the terminals 14 of the terminal assembly 13 from the jaw teeth 23 and 33 of the

jaws

21 and 32 respectively. Upon the ejection of the terminal assembly 13 from the

jaws

21 and 32, the handle 111 is manually returned to position A to release the valves 126 and '127 permitting the spring biased block 73 and the spring biased piston rod A66 to retract the.

rod 49 and consequently release the valve 87 to allow the spring biased -rod 101 to :return to a retracted postion.

The terminal assembly isl then rotated 180 so 'that terminals will be beneath the tenninals 14 as shown on the right in FIG. 7. The terminal yassembly 13 is thereupon moved down against the ejector plate 96 `so as to insert the terminalsl between the teeth 22 land 33 ofthe reciprocating jaw 21 and the stationary jaw 32. The handle 111is thereupon moved from position A' to position C (FIGS. l, 2, 3 and 5) to move the cam surfaces 118 and 119 into contact with the valve triggers 132 and 133 of the valves 128 and 129 to sequentially operate the valves 128 and 129. The sequential operation of thevalves `12.8 and 129 sequentially operate the air cylinders 72 and 67 first to insert the spring biased block 74 in the path of the yoke 56 which locks the yoke 56 against movement and second to move the yoke 5S to the left (FIG. l) to pivot the lever 53 about the pin 60. This pivotal movement of the lever 53 thereupon moves the rod 49 to the left and the lever 47 clockwise to move the jaw I21 to the right. The movement of the jaw 21 to the right will bend the terminals 15 as indicated by the dashed lines on the left in FIG. 7. Thus the two individual sets of terminals 14 and 1S will be bent to the same angle and in the same direction.

Upon complete leftward movement of the rod 49 thev valve actuator 82 will operate the valve 87 to admit air into the air cylinder 103 which will move the spring biased piston rod 101 and the cam 99 to force the ejector plate 96 upward to remove the terminal assembly 13 from the position indicated on the left in FIG. 7. Upon ejection of the terminal assembly 13, the handle 111 is returned to position A to release valves 128 and 129 permitting the spring biased piston rod 67 and the spring biased block 74 to move rod 49 and lever 47 to bring jaw 21 to a neutral position land consequently releasing the valve 37 to allow the spring biased rod 101 to return to move the ejector plate 96 to the surface of the jaw guide 31. At this point the apparatus is ready for insertion' of another `set of terminals 14 between the teeth 33 and 22 of the stationary jaw 32 and the reciprocating jaw 21 in readiness for another bending cycle.

It is to be understood that the above-described arrangements are simply illustrative of the application 'of the principles of this invention. ments may be readily devised by those skilled in the art which will embody the principles of the invention and fall -within the spirit and scope thereof.

What is claimed is: i

l. A bending apparatus comprising a stationary jaw, a movable jaw slidably mounted adjacent ysaid stationary jaw, means pivotally connected to said movable jaw to reciprocate said movable jaw, a lever oscillatively connected at a mid-point thereof to said means having opposite ends thereof extending laterally from the path of the movement of the movable jaw, means for oscillating the lever, means for alternately locking the ends of the lever against movement to reciprocate the mid-point of the lever when the lever is oscillated to reciprocate they movable jaw, and means to sequentially operate the locking and oscillating means.

2. A terminal bending apparatus comprising a stationary jaw, a movable jaw slidably mounted adjacent said stationary jaw to bend terminals simultaneously placed in the stationary and movable jaws, means pivotally connected to said movable jaw to reciprocate said movable jaw, a rod pivotally connected at one end thereof to said meansto operate said means when said rod is reciprocated, a lever pivotally mounted at an intermediate point thereof to the other end of said rod, an actuating means for moving the ends of the lever to oscillate the lever, means for alternately locking the ends of the lever when the lever is oscillated to impart a reciprocating movement to the rod, and control means for sequentially operating the -lever locking and moving means.

Numerous other arrange- 3. A terminal bending apparatus comprising a .stationary jaw, two sets of parallel spaced teeth extending laterally from said stationary jaw, a movable jaw slidably mounted adjacent said stationary jaw to move longitudinally thereto, two sets of teeth extending from the movable jaw having surfaces in alignment with the teeth extending from said stationary jaw, one set of said movable jaw teeth having bending surfaces rendered effective upon movement of said teeth' relative to said stationary teeth in a first direction, the other set of said movable jaw teeth having bending surfaces rendered effective upon movement of said teeth relative to said stationary teeth in an opposite direction to bend terminals received therebetween when said movable jaw is reciprocated, means pivotally connected to said movable jaw to reciprocate said movable jaw, a rod pivotally mounted at one end thereof to said means to reciprocate said means when said rod is reciprocated, a lever pivotally mounted at an intermediate point thereof to the other end of said rod, actuating means for moving the ends of the lever to oscillate the lever, means Afor Ialternately locking the ends of the lever when the lever is-oscillated to impart a reciprocating movement to the rod, and control means for sequentially operating the lever locking and moving means.

4. A bending apparatus comprising a stationary jaw, a movable jaw slidably mounted adjacent said stationary jaw, a rod linked to said movable jaw to reciprocate the movable jaw when said rod is reciprocated, a yoke rigidly secured to said rod, a leverr pivotally secured within the yoke with the ends thereof extending laterally from the yoke, a pair of yokes pivotally secured to respective ends of the lever, means to alternately reciprocate the pair of yokes, -a pair of blocks, means for independently and alternately inserting the blocks in the path of the respective actuating yokes to Ialternately prevent movement thereof to reciprocate the rod, and control means for sequentially operating the reciprocating means for the pair of yokes and the inserting means for the blocks.

5. A bending apparatus comprising a stationary jaw, two sets of parallel spaced teeth extending laterally from said stationary jaw, a movable jaw slidablyrmounted adjacent said stationary jaw to move longitudinally thereto, two sets of teeth extending vfrom the movable jaw having surfaces in alignment with the teeth extending from said stationary jaw, one set of said movable jaw teeth having bending surfaces rendered effective upon movement of said teeth relative to said stationary teeth in a first direction, the other set of said movable jaw teeth having bending surfaces rendered effective upon movement of said teeth relative to said stationary teeth in an opposite direction to bend terminals received therebetween when said movable jaw is reciprocated, a rod pivotally linked at one end thereof to said movable jaw to reciprocate said movable jaw when said rod is reciprocated, a yoke rigidly secu-red to said rod, a lever pivotally secured within the yoke with the ends thereof extending laterally from the yoke, a pair of yokes pivotally secured to respective ends of the lever, means to alternately reciprocate the pair. of yokes, a pair of blocks, means for independently and alternately inserting the blocks in the path of the respective actuating yokes to alternately prevent movement thereof to reciprocate the rod, and control means for sequentially operating the reciprocating means for the pair of yokes and the inserting means for the blocks.

6. A bending apparatus comprising a stationary jaw, a movable jaw slidably mounted adjacentsaid stationary jaw, said movable iaw having a recess therein, a stationary pin, a first'lever pivotally mounted on said pin, said first lever having Ia node thereon positioned in the recess of the movable jaw to impart linear movement to the movable jaw when the first lever is pivoted, a rod pivotally connected at one end to the rst lever to pivot the first lever when the rod is reciprocated, a second lever pivotally secured to the other end of the rod with the ends thereof extending laterally from the rod, a pair of yokes pivotally secured to respective ends of the lever, means to alternately reciprocate the pair of yokes, a pair of blocks, means for independently and alternately inserting the blocks in the path of respective actuating yokes' for alternately preventing Ymovement thereof to reciprocate the rod, and control means for sequentially operating the reciprocating means for the pair of yokes and the block inserting means. v 7. A terminal bending apparatus comprising a stationary jaw, a movable jaw slidably mounted Iadjacent said stationary jaw to move linearly thereon, said movable jaw having a recess therein, two sets of parallel teeth extending from the stationary jaw having spaces therebetween to receive terminals laterally disposed thereto, two sets of teeth extending from the movable jaw having surfaces aligned with the teeth extending from the stationary jaw to receive the terminals laterally disposed thereto, one set of said movable jaw teeth having slanting surfaces rendered effective upon movement of said teeth relative to said stationary teeth in a first direction, the other set of said movable jaw teeth having slanting surfaces rendered effective upon movement of said teeth relative to said stationary teeth in an opposite direction, a stationary pin, a first lever pivotally mounted on said pin, said first lever having a node thereon positioned in the recess of the movable jaw to impart a linear bending movement to the movable jaw when the first lever is piyoted, a rod pivotally connected at one end to the first lever to impart a pivotal movement to the first lever when the rod is reciprocated, a second lever pivotally connected to the other end of the rod having the ends thereof extending latemlly from the rod, a pair of air operated spring biased piston rods pivotally connected to the second lever on opposite ends thereof to oscillate the second lever, a pair of stops in the path of the ends of the second lever, and a pair of air operated spring biased blocks alternately insertable in rthe path of the second lever 4'against the stops for alternately locking the ends of the second lever against movement when the lever is oscillated to cause the rod to reciprocate.

S. A terminal bending apparatus comprising a stationary jaw, two sets of parallel teeth extending from the stationary jaw having spaces therebetween to receive terminals laterally disposed thereto, a movable jaw slidably mounted adjacent said stationary jaw to move linearly thereon, said movable jaw having a recess therein, two sets of teeth extending from the movable jaw having surfaces aligned with the teeth extending from the stationary jaw to receive the terminals laterally disposed thereto, one set of said movable jaw having slanting surfaces rendered effective upon movement of said teeth relative to said stationary teeth in a first direction, the other set of said movable jaw teeth having slanting surfaces rendered effective uponcmovement of said teeth relative to said stationary teeth in an opposite direction, a stationary pin, a first lever pivotally, mounted on said pin, said first lever having a node thereon positioned in the recess of the movable jaw to impart a linear bending movement to the movable jaw when the first lever is pivoted, a rod pivotally connected to said movable jaw to reciprocate the movable jaw when the rod is reciprocated, a yoke rigidly secured to said rod, a lever pivotally secured within the yoke with the ends thereof extending laterally from the yoke, a pair of yokes pivotally secured to respective ends of the lever, means to alternately re- 8 ciprocate the pair of yokes, a pair of blocks, means to independently and alternately insert the blocks in the path of the respective yokes of the pair of yokes to alternately prevent movement thereof, and control means to sequentially operate the reciprocating means for the pair `of yokes and the block inserting means.

9. In a bending apparatus, a first jaw, a second jaw adjacent said first jaw having a surface of sliding contact therewith, means for relatively moving said jaws, a pair of teeth mounted on said first jaw having adjacent surfaces perpendicular to said surface of sliding contact and spaced to receive a member therebetween, a pair of teeth mounted on said second jaw, each tooth on said second jaw having a surface in the plane of said adjacent surface of an opposing tooth of said first jaw, each tooth of said second jaw having a sianting surface, each of said slanting surfaces having extended adjacent planes which are parallel and which form acute angles with said surface of sliding contact where said slantingsurfaces and said extended planes receive a bent portion of said member upon relative motion of said jaws.

l0. ln a bending apparatus, a first jaw, a second jaw adjacent said first jaw having a surface of sliding contact therewith, means for relatively moving said jaws, a first and a second tooth mounted on said first jaw having `adjacent surface-s perpendicular to said surface of sliding contact and spaced to receive a member therebetween; and a first and a second tooth mounted on said second jaw, said first tooth of said second jaw having a surface congruent with said adjacent surface of said first tooth of said first jaw, said first tooth of said second jaw having' a slanting surface extending from said congruent surface and away from said second tooth of said second jaw and forming an obtuse angle with said congruent surface, said second tooth of said second jaw having a slanting surface extending away from said surface of sliding contact `and towards said first tooth of said second jaw thereby defining a recess which forms an acute angle with said surface of sliding contact, said second tooth of said second jaw having a surface extending from said slanting surface forming an obtuse angle therewith yand aligned with said adjacent surface of said second tooth of said first jaw where said aligned surface is laterally spaced from and` above said congruent surface to receive a portion of said member therebetween, where said sl-anting siu'faces receive a bent portion of said member therebetween upon relative motion of said jaws.

11. ln a bending apparatus, a first jaw, a second jaw slidably mounted on said first jaw, la lever, a firstmeans connected to a first end of said lever for oscillating said lever, a second means connected to a second end of said lever for oscillating said lever, a first means for blocking movement of said first end of said lever, a second means for blocking movement of said second end of said lever, means for selectively rendering said first oscillating means and said second blocking means effective or said second oscillating means and said first blocking means effective to oscillate said lever, and means for imparting oscillations of said lever to move said slidable jaw.

McClure July 9, 1918 2,680,395

Christiansen June 8, 1954