US1166711A - Riveting-machine. - Google Patents

Description

. GUY W. os'BoRNE, or' MAssILLoiv, OHIO.

To aZZ whom t may concern RivErING-MACI-HNE.

Application filed August 5 1914. Serial No. 855,258.

Be it known that I, GUY W. vOsBoRNii, a citizen of the United States, residing at Massillon, Ohio, have invented a certain new and useful Improvement in Riveting- Machines, of which lthe following isl afull,

clear, and exact description, such as will enable others skilled in the art to which it appertains to make anduse the same:-

-This invention relatesj to riveting inachines, andhas for its main object to provide an automatic*work-gripping'device of novel form that will securely hold in operative position work that is being riveted, and thus overcome the necessity of employing a workman for .the specific purpose ofV holding the work during theriveting operation. 1 Y V V 1 Another object is to provide a work3- gripping device for riveting dies `thatrwill hold Ythe work in such apposition thatthere is. little liability of a rivet becoming canted or assuming an incorrect position duringV the operation of upsetting the rivet. And

stillanother object is to provide a station! ary die or upsetting die for riveting machines that "is equipped with a work-holding device Ythat prevents the work from swinging or drifting out of line after'therivet is in place ready to be upset, and which is so designed that the workcanfbe moved ver? tically and horizontally after a rivet has been upset without moving thework lat-V erally away from Vthe work-holding device. Y Other objects and desirable featuresof my invention will 'be hereinafter pointed to upset. Fig. 2 is a top plan` viewLof the upsetting die andthev work-holding device that'fis combined with samer Fig. 3 is a* vertical longitudinal sectional view taken y' oii the lineB-of Fig. 2; and Fig. @is an end view oftheiupsetting die andv theworkholding device. Y y

Referring to the drawings-which illus-y trate vthe preferred form ofmy'invention, A designates thestationary die vorli'ipsetf ting die' of a' riveting machine, such, for f example as a pneumatichydraulic or'comf l pression riveter,'and B designates theinov@ :A Specification of Letters Patent. l

. forwardly7 Patented Jan. et, 192116.

able die or plunger die of the machine. Thel work fr herein shown, which lconsists of a` circular shell provided with a crowned head or end piece, vis arranged between the dies A and B, and 'after Vthe rivet y has been inserted the work is "shifted intooper'ativev position between `said dies.' It is the general )ractice` to employ workmenfor ther speciric purpose of holding the-'workinl op--` and By erative Iposition betweenl the dies'A so as 'to prevent the work from swinging or drifting outiof line or ahead 'and away from the plunger die, due' to momentum" causedf by thrust of said die andv the-sud-l den retarding in lvelocity of thrust by rivet: die during the `operation` of upsetting the rivet, thus insuring in this manner a normal uniform head' onboth engaging upsettingends of rivet; t must be borne ,in mind that in operating riveting-machines j of the type referred' to, the rivet is .inserted in the vwork andthereafter the work is brought up against the plungerdie withthe. rivet head in the cup Vvof same before theplunge'r die moves, and when the plunger die moves the work is moved thereby;and'V gathers momentum that tends to "carryVH itI away from the plunger rdie when the rivetv comes into contact withthe stationary'for upsetting die. Ifit were impossible to prevent the o verthrowing ofthe work, due tof `the thrust of said plunger die, -practicallyf every rivet upset would be a failure, as the rivet coming iii contact with the stationaryl dieretards or stopsthe thrust ofitheplune.I ger die, and the woikwouldcontinue on' away from said plunger die, 'thus allowingl the'rivet to back out vof'its hole to'suchlan extent that the upset endV would befonly partly formed; and the." 'outery end would be what is termed an abnormal squash'. "As-` before stated, thev work'to be riveted has" heretofore been, to 'some extent, controlled` by workmen, although this'has been very unsatisfactory, lowing tothe (large numberf of iniperfectly` formed rivets that havehady to beftaken'y out :and replaced.

Ill inyimProved machine a WOI'k-li'olfding device C is combined with the stationary die or upsetting die' in'v such the movable die orfplunger die B thework and eliminating the possibilitylof manner that the work` will beheld securely against; during' the i riveting operation,vv thus overcoming. the' necessityv of employing a workman to "hold" the rivet becoming canted orbac'kiiigf outf'f iio AAdjacent the rear end of the die A is of its correct position. In the preferred form, as shown herein, the work-holding device C consists of a member reciprocatingly mounted on the stationary die A and acted upon by a coiled compression spring D that holds said member securely against the work, but permits the work and said member to move inwardly toward the stationary die when the plunger' die B is in operation. 1n other words, the 'upsetting die A of my machine is provided with a spring-pressed work-holding device C that bears against one side of the work being operated upon, and thus holds the work securely against the movable die B, thereby preventing the rivet 1/ from assuming an angular or partly backed out position and preventing the work from drifting or swinging out of alinement with the dies after each stroke of the plunger die D.

The upsetting die A is made of hard steel and the front end of same is tapered off at 1 so as to permit the work-holding d evice C to bear upon the work in close proximity to the rivet, as hereinafter described. At the rear end of thev die A is a shank or extension 2 that projects into a bore in the stake E of the riveting machine, and means are provided forrsecurely connecting said die to the stake E, the means herein shown for this purpose consisting of a bolt 3 that passes through the stake and which is tapped into the rear end of the extension 2 on the die. The work-holding device C herein shown is in the form of a sleeve that is slidingly mounted on the die A, said sleeve being provided with an elongated slot et that receives a guide pin 5 on the die A, which prevents said sleeve from rotating relatively to the die A. T he coiled compression spring D surrounds the sleeve portion of the work-holding device and at one end bears against an annular flange G on same, the opposite end of said spring bearing against the stake E of the machine. an annular flange 7 which centers the spring D and holds it spaced away from the die A, and the ends of said spring are tapered off, as shown in Fig. 2, so as to form flat faces at the ends of the spring which provide suflicient bearing for the spring against the shoulder 6 on the work-gripping device and the stake E which carries the upsetting die. |The spring D is of sufficient cross-sectional area to offer the necessary resistance to the rearward thrust of the work-gripping device C to firmly grip the work when the plunger die B moves forwardly, thus causing the rivet to line up true, with the head thereof lying snugly against the outside of the work, before being upset in the die A. At the front end of the device C are a plurality of work-gripping jaws c that are beveled off or tapered on their inner sides, as

shown in Fig.Y 3, so that they will conform to the tapered portion l at the front end of the upsetting die A, the tapered portions of the jaws c being a trifie shorter than the tapered part 1 of the die A, so that the front face of said die A will project slightly beyond the ends of the jaws c when the worlclamping member C is forced far enough back to bring the beveled faces on the jaws c into engagement with the tapered port-ion 1 of the die fr. I1`he two upper aws are preferably tapered off partly at the top and front thereof so as to better adapt themselves to certain kinds of work, such as the riveting of (lished heads waere the flange is not very wide. The spring D which acts upon the work-clamping member C has sufficient coil pitch to permit the member C to move clear back against the tapered portion 1 of the die without fully compressing the spring, thereby permitting the die A to be redressed as the cup of same becomes worn.

1n the embodiment of my invention herein shown the work-gripping member C is provided with four jaws c which are so arranged with relation to each other that a horizontal slot and a vertical slot are provided between the jaws, as shown in F ig. t. r1`he jaws c are of suiiicient length to bear against the inner side of the article being riveted when the inner end of the rivet 1/ engages the cup in the die A, and the vertical and horizontal slots between said jaws are wide enough to permit the upset end of the rivet or head of the rivet to pass freely from between same after the upsetting operation, by shifting the vwork horizontally or vertically, thus overcoming the necessity of moving the work laterally away from the work-clamping device C, after the riveting operation has beencompleted. While the front ends of the jaws o are of sufficient area to obtain a firm hold on the work, still they are small enough to enable yall of the jaws to bear upon the inner lap of the seam at the same time, thus eliminating the possibility of the work beingheld in a slanting position and throwing the rivet out of line, as would occur if two of the jaws engaged the inner surface of the inner lap and tne other two jaws engaged the inner surface of the outside lap.

My invention is applicable to compression, power, pneumatic or hydraulic riveters, and the main advantage of same is that it overcomes the necessity of employing a workman for the specific purpose of holding the work in operative position during the riveting operation. It places the work entirely in the hands ofthe operator of the riveting machine, so far as upsetting the rivet and holding the work in place is concerned, the rivet boy merely heating the rivets and putting them in place in the usual manner.

In addition to eliminating the services of one worlnnan, my invention insures perfectly formed rivets, owing to the fact that the stationary vdie or upsetting die of the machine has combined with it a spring-actuated Work-clamping device that bears upon the work in close proximity to the rivet and holds the work so securely against the movable die or plungei die of the machine that it is impossible for the rivet to become canted or assume an angular, as Well as a lax or partly backedput, position during the operation of upsetting a rivet.

Having thus described my invention,

consisting of a cylindrical-shaped member,

a. tubular-shaped work-clamping member reciprocatingly mounted on said die and provided at its front end with a plurality of spaced work-engaging jaws, the spaces between said jaws being of a width slightly greater than the diameter of a finished rivet head, and a coiled compression spring surrounding said tubular-shaped member and bea-ring against a shoulder thereon.

3. An upsetting die for riveting machines f consisting of a cylindrical-shaped member provided with a tapered end, a tubular-v shaped work-clamping member reciprocatingly mounted on said die and provided at its front end with a plurality of work-engaging jaws whose inner sides are beveled so that they will conform to the tapered krpoition ofpsaid die, a compression spring ,surrounding said tubularfshaped member and` bearing against a shoulder thereon, and

means adjacent the rear end of said die for holding said spring spaced away from the shank thereof.

4. Ina riveting machine, a rigid support; an upsetting die comprising a cylindrical lmember having a tapered portion at its front end, and an integral collar adjacent its rear end; a cylindrical workegripping member slidably mounted on said die and provided at its front end with iiiturned tapered portions that limit the ,rearward movement of said member on said die; and

a coiled expansion spring interposed 'be-v tween said support and a shoulder on said member so as to normally tend to force said member forwardly on `said die, said spring surrounding the collar on said die at its rear end.

signature in the presence of two witnesses, this lst day of August, 1914.

GUY W.l OSBORNE. Witnesses: j

Tiros. C. DAVIS, v

CHARLES H. WISEMAN.

Copies of this patent may be obtained for ive cents each, by addressing the, Commissioner of Patents, Washington, D. C.

In testimony whereof I hereunto atlix my

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