US2230518A - Machine with pressure medium drive for riveting perforated workpieces - Google Patents

Description

Feb. 4, 1941. WEINHQLD 2,230,518

MACHINE WITH PRESSURE MEDiUM DRIVE FOR RIVETING PERFORATED WORKPIECES Filed Aug. 29, 1959 G'Sheets-Sheef 1 V 3- 8, IIIIIIIIII IIIIIIIIIII Feb. 4, 1941. K N-HO 2,230,518

MACHINE WITH PRESSURE MEDIUM DRIVE FOR RIVETING PERFORATED WORKPIECES Filed Aug; 29, 1939 6 Sheets-Sheet 2 2 3a 95 W 3 I V l/ I 77% 26 r n3 as 25 2% 3 5 E 3" r 1o 3 75 x 7 f3 19 a 104 N5 100 4g a1 89 7 83 u n/ K. 61/

Feb. 4, 1941. Y WEINHQLD 2,230,518

MACHINE WITH PRESSURE MEDIUM DRIVE FOR RIVETING PERFORATED WORKPIECES Filed Aug. 29, 1939 e Sheets-Sheet z mm v 79 6'3 91 .7mvqkfar:

Kale Ming Feb. 4, 1941. K; mHo D 2,230,518

MACHINE WITH PRESSURE MEDIUM DRIVE FOR RIVETING PERFORQTED WORKPIEES Filed Aug. 29, 1939 6 Sheets-Sheet 4 4 92 6% 66 i 82 a: a

9? 7 85 TLI: V i 9 .Feb. 4, 1941. K WEI'N-HOLD 2,230,518

HAOHINB WITH PRESSURE IID IUI DRIVE FOR RIVETING PBRFORATED WORKPIECES Filed Aug. 29, 1939 6 Sheets-Sheet 5 T." 4-O M@2 5 45 56 0 f-A. WA,

2,230,518 IACHINE Wm! rksssuns uanwu DRIVE FOR mvanue rsnrom'rso wonxrmcss Feb. 4, 1941.- K. WEINHOLD Filed Aug; 29, 1939 6 Sheets-Sheet 6 I ml Patented Feb. 4, 1941 UNITED STATES PATENT OFFiCE MACHINE wrrn PRESSURE MEDIUM nerve .ron. mverme renrom'ren womn PIECES Karl Weinhold, 'Frankfort-on-the-Main, Germany, assignor to Frankfurter Maschinenbau Aktiengesellschaft, vorm'. Pokorny & Wittekind,

Frankfort-on-the-Main Application August 29, 1939, Serial No. 292,466

In Germany September 6, 1938 4 Claims. (01. ISM-48) I holes were drilled with simple drilling machines and the riveting carried out with the aid of riveting presses or riveting hammers. a considerable amount of work and time, as it is necessary to secure the rivet in very close spacing, in order to obtain a good plate closing and also every rivet must be introduced by hand into its rivet hole so that the set head sits well. This work requires a considerable amount of time in the case of bulky workpieces. Moreover, two well-trained workers are necessary for riveting by means of a riveting hammer, oneof which workers inserts and clinches the rivet and the other attends to the dolly.

These objections are overcome according to the invention in that the snap serving for form ing the rivet tail and a resilient centering pin longitudinally slidable therein and with which the workpieces are brought into contact are mounted in the work table and that above the workpiece a plate closer, a rivet driving die slidably mounted therein, and an automatic rivet feeding device are arranged and that, by adjusting a shut-off element, the pressure medium .is first fed to a piston controlling the plate closer with the re suit that the plate closer containing the rivet is.

lowered on to the workpiece. By further adjustment of the shutting-0E element pressure medium is'fed to the piston controlling the rivet driving die with the result that the rivet is driven in and forces back the resilient centering pin, and that, after the driving in operation, the pressure medium feed to the piston of the press driving the snap becomes freefor the formation of the tall, the rivet driving-ill die remaining on the set head as a dolly. In this construction of the machine the worker only has to bring the workpieces, for example plates to be riveted, into engagement with the centering pin and to actuate the shut-01f element with the aid of a lever.

The operations necessary for closing the plates;

This requires cally. Even in the case of bulky workpieces and those with varying rivet distribution, the expenditure of work and time necessary for the joining isconsiderably less than hitherto, one operation being sufficient. The riveting of the perforated workpieces is also more simpleand clear.

To be certain that the 'formationof the tailis only commenced after the rivet driving die serving as a dolly bears against the set head of the rivet, an aperture is arranged, according to the invention, in the cylinder of the pressure 1 piston serving for operating the rivet driving die, this aperture being liberated after the rivet has been set and effects the feed of pressure medium to'the pressure piston operating the snap.

In the case of simple passage arrangement the proper feeding of the rivets can be ensured in that an aperture is provided in the cylinder of the piston serving for operating the rivet driving die, this aperture being opened at the end of the stroke and serves for effecting the drive of the rivet feeding device.

To -facilitaixe the attendance of the machine by the fact that, after the riveting operation, all the tools are returned automatically into their initial positions merely by the releasing of the lever serving for -adjusting the shut-off element,'

operating the rivet feeding device is efiected by the pressure piston serving for operating the rivet driving die, the same passages at the return of the shut-off element into its initial position, can' servefor bringing these' three pistons into communication with the atmosphere by means of common passages.

An embodiment of the invention is illustrated by way of example in the accompanying drawings, in which: a

Fig. 1 shows a portion of the machine in iongitudinal section, 8. 2 shows a portion scale,

Fig. 3 shows on a smaller scale the portion of the machine illustrated in Fig. 1 in a different of :Fig. 1 on a larger operating position,

Fig. 4 is a similar view toFig. 3 showing the machine portion in yet another operating position, o l

Fig. 5 is a similar view to Fig. 1 but in a different operating position, 1

Fig. 6 is a side elevation of Fig. 3, some parts being shown in section,

Fig. 7 is a plan viewof Fig; 6 partly in section,

Fig. 8 is a section on line VIII VIII oiFig. '1,

Fig. 9 shows a portion of Figs 6 in side elevation and on a larger scale,

Fig. 10 is a top plan view of Figl 9,

Fig. 11 shows the slide valve in section and in another operating position,

Fig. 12 is a top plan view of Fig. 11.

The plate closer, the rivet driving-in die, the rivet feeding device and the shut-01f element are arranged in the upper pant of the bowl I in the machine head 2 and by means of this shut-01f element the pressure pistons of these devices are subjected to the action of compressed air which is fed through the conduit 3. The work table, the centering pin and the pneumatic press for the forming of the rivet tail are accommodated in the lower part 4 of the bow I.

The plate closer which will be hereinafter described has a sleeve 5 which is longitudinally shiftable in the head 2 and rigidly connected by means of a bolt 6 with a pneumatic piston 1 which can reciprocate in a pneumatic cylinder 8 and is under the action of a spring 9. A piston slide valve I8 is mounted in a sleeve II in the head 2 at the side of the pneumatic piston I.

The sleeve H has at its lower end an aperture l2 through which a rod l3 extends. A lever |4 keyed on a shaft 5 bears against this rod N. A handle l6 (Fig. 6) is also keyed on the shaft l5. .The piston slide valve I8 is acted upon by a spring H which bears against the bottom of the sleeve II and tends to bring the valve into the position shown in Fig. 1 in which the compressed airfeed conduit 3 is shut-ofl' from the interior of. the cylinder 8. The piston slide valve at the same time shuts off the feed conduit l8 leading 'into theannular space I! of the piston slide nected to the guide piece 28.," A toggle lever consisting of three members 25, 26, 21 mounted on a common bolt 28 is connected with the guide piece 24. I The member 28 of the toggle lever is oscillatable about the bolt 28 fixed in the head 2,

. the member is oscillatable about a bolt 30 journalled in the guide piece 24 and the member 21 is oscillatable about a bolt 8| mounted in a pressure piston '32. This pressure piston is re- -ciprocatable in a cylinder .88 and under the acslide valve is inthe position shown inFlg. 1f

the compressed air conduit 8 isshut-ofl from the port 81.

The rivet feeding device operates like a'lock to which the. rivets are fed from a semi-spherical dish 38 into which a rivetgripper can be swung and out of which the gripper can be swung so that the rivets are brought into alignment with the mouth of the passage 48 in the guide rail 4| (Fig. 6). I

The rivet gripper, which has a slot 42 into vwhich the rivets 48 drop, is fixed on a shaft 44 arranged at the inlet of the passage 48 in the guide rail 4| and carrying a pinion 45 which meshes with a rack 45 on a pressure piston 41 reciprocable in a cylinder 48 (Fig. 8). This piston is acted upon by a spring 48 and can be moved by hand with the aid of a knob 58. The cylinder 33 accommodating the pressure piston "has an aperture 5| (Fig. 1) connected by a hose 52 (Fig.

7) to the cylinder 48.

. extension 59 connected with the sleeve 5. At the side of the slide 56 a shaft 62 is journalled in bearings, 6| on the rail 4|. A lever 64 is keyed on one end of this shaft and cooperates with the abutment 58. A lever 64 is keyed on the other end of shaft 62 and bears against the slide 56. The lever 63 is acted upon by a blade spring 65 fixed on the rail 4|.

The slide 56 consisting of the two parts We and 56b has an aperture 68 corresponding in width to the width of the passage 48. An abutment piece 56c is fixed on the slide proper 58 and carries a handle 68. The slide 56 is guided on the guide rail 4| which for this purpose has two straps 56] and 569'. The rivets 43 with their shanks in the passage 48 and their heads in an aperture 61 can come between the straps 56] and 569-015 the rail 4|. The aperture 66 is' oblique (Figs. 9 to 12) .so that, when the slide 56 (Fig. 10) is in one position, one rivet 43 comes into the position ready for use and, when the slide is in its other position (Fig. 12), this rivet can move on in the passage 48 whereas the opposite rivet is blocked at the entrance to the aperture 46.

A movable part (Fig. 1). cooperates with the stationary part 4| of the rivet feeding device and is mounted in an extension piece 55 of the plate closen. This movable part has a passage 68 whose cross-section corresponds to that of the passage 48. This passage 68 extends to a bore 18 for the'rivet driving-in die 22 in the extension piece 55., The lower end of the plate closer I is formed by a carrier 'II for two gripper jaws I2 which --are eachoscillatable about an axle 13 formed on the carrier II and held together by a rubber band I4. The carrier II has a bore 15 as passage for the rivet driving-in die 22. The carrier 1| bears with its lowerlend 18 against the plates 11, 18 to be riveted together.

The riveting press arranged in the lower part .4 of bowl I is a toggle lever press, the toggle lever consisting of the members 18, 88, II. Themenrber I8 is oscillatable atone end-about a bolt," and hingedly connected to a piston 88 88 is oscillatable about a bolt 86 mounted in a housing 81. The member 8| is oscillatable at one end about a bolt :0 eccentric to bolt to and is connected at its other end to a guide element II for the snap .II by a bolt 88. This guide element 84 is longitudinally shiftable in the-housing. The housing in is held on the cylinder! housing 84 by two pins 92 andis screw threaded on its upper. end for the vertical adjustment of the rivet press withthe aid of a nut 93.

' erated at the end of the stroke of the pressure The cylinder 84 is connected by a hose conduit 94 to a nozzle 95' leading to an aperture 95 in the cylinder 33 of the pressure piston 32. This aperture 95 is so arranged that it is libpiston. The piston 63 is under the influence of a return spring 91.

The snap 9| is guided in 'a guide-piece 96 forming the work table. This guide piece 98 is fitted in the housing 01 and is vertically adjustable by means of a nut 99. The snap has on its lower, end a widened portion I00 fitted in a recess in the guide element 00. The widened portion I00 is hollow and accommodates the head I0! of a centering pin I02 which is guided in the snap 9|. A spring I03 bears against the head IOI, so that the centering pin I02 is yieldably mounted. The spring I03 tends to-bring the centering pin I02 into a position, in which it projects beyond the surface of the work table 98. The end face of the centering pin. I02 can be accurately adjusted in the plane of the uppertering pin I02. The parts of the machine then assume the position shown in Fig. i, in which the pressure pistons I, 32 and 03 are in one of'their extreme positions under the action of the springs acting upon them and the piston slide valve .I0

is ina position in which the cylinders of these pressure pistons communicate with'the atmosphere.

The rivets 43 are first placed in the dish 30 of the rivet feeding device and by pushing inwards the knob 50 the rivet gripper 39 is swung into its upper position indicated in dot-dash lines in Fig. 6, so that the rivets. drop into the guide rail 4| and get in front of the slide 56. This slide is moved by means of the handle 68 so that the aperture 66 of the slide first comes into the posi-.

tion shown in Fig. 10, whereupon the slide is.

shifted in the opposite direction, into the position shown in Fig. 12 with the result that a rivet is separated from the row of rivets, shifts on in the guide rail H and enters the stationary passage part 69 where it rests against the rivet driving-in die 22 (Fig. 1).

If the operator then depresses .the lever I6, the piston slide valve I0 assumes the position shown in Fig. 3; During this movement the apertures 20 and 31 are first shut-off from the atmosphere and the aperture 20 is brought into communication with the annular space I9 of the piston slide valve and consequently with the compressed air feed conduit 3. The compressed aire iters into the cylinder 0 through the conduit 2|, forces the piston I forward, thereby compressing the spring 9 and the piston shifts the sleeve 5 of the plate closer until the .face I6 bears against the plate 11 and causes the plate closure. As the sleeve 5 descends the rivet driving-in die 22 protrudes from the extension pieeeh59 so that the rivet 43 passes under the end face of the driving-in die and its shank can come between the jaws 12 so that its head is supported by these jaws.

When the end face I6 of the plate closer comes into contact with the plate 11, the rivet 43, the end face of whose shank rests on the centering pin I02, is pushed back slightly in the bore 15 (Fig. 3).

By swinging the handle I5 the port 31 is then brought into communication with the annular space I9 of the piston slide valve I0 (Fig. 4). Compressed air then flows through the passage 36 and the port 35 into the cylinder 33 and pushes forward the piston 32. thereby compressing the return spring 34. By means of the toggle lever 25, 26, 21 the guide element 24 is pushed downwards and consequently the rivet driving-in die .22'. is pressed on to the head of the rivet 43 held between-the jaws I2, so that the rivet pushed out of the jaws into the rivet hole I05 is held in position by the centering pin I02 until its set head bears against the plate 11. During this movement the centering pin I02 can yield correspondingly owing to it being resiliently mounted.

Only when this tion on the set headof the rivet 43 so that the die acts as dolly.

At the end of its stroke the aperture Si is uncovered by the piston 32, so that compressed air flows through the conduit 52 into the e'ylin-' der 48 ofthe rivet feeding device and shifts the piston 41, thereby compressing the spring 49'. Thus, the pinion 45 is rotated so that the rivet "gripper 39 is swung into the semi-spherical dish 38 and takes up a fresh rivet 43.

Before the plate closer 5 descends, the slidevalve 55 of the rivet feeding device has assumed the position shown in Fig. 11, in which the abutment 58 bears against the lever 63 and has swung the lever 63 outwards in compressingthespring 51, so that the slide is pushed forward .by the spring 51. During the lowering of the "plate closer 5 the two- armed lever 63, 64 is swung into the position shown in Fig. 9 by the blade spring 65, so that in compressing the spring 58, t e slide 56 is pushed into the position shown in Fig. 10 in which a rivet 43 is in position ready for use.

If, after the riveting has been effected, the handle I6 is released by the operator the piston slide valve I0 returns into its initial position unoperation is terminated theaperture 96in the cylinder 33 is liberated-by the der the action of the return spring II. In this position the cylinder 8 on the one hand communicates with the atmosphere through the passage 2|, the aperture 20, the lower .part of the guide sleeve II of the piston slide valve and the aperture I2 through which the rod I3 extends with clearance, and the cylinder 33 on the other hand communicates with the atmosphere through the port 35, the passage 36, the port 31, the

sleeve II and the apertures 20 and I2. The resuit is, that the piston I is forced back into its initial position by its return spring 9 and, the piston 32 by its return spring 34. At the same time the compressed air can escape from the cylinder 64 through the conduit .94 into the cylinder 33 and consequently into the atmosphere with the result that the piston 03 is moved into its initial position by its spring 91. Compressed the conduit 52 and the aperture ll into the cy-linder 33 and consequently into the atmosphere. The piston 41 .therefore returns into its initial position under the action of its return spring 49 with the result that the rivet gripper 39 is raised in clockwise direction into. the position indicated in dot-dash lines in Fig. 6 so that rivets drop into the guide rail ll.

During the upward movement of the plate closer the abutment 58 comes into contact with the lever 63 of the controlling mechanism of the rivet feeding device and thus bringsthe slide 56 out of the position ready for operation shown in Fig. into the position shown in Fig. 12 in which a rivet 43 is separated and can enter the movable part 69 of the guide rail provided on the plate closer 5.

Consequently, the operator need only bring the perforated plates 11, 18 into engagement with the centering pin I02, depress the lever I6 and then release it. All operations necessary for the riveting then take place automatically in the requisite succession, that is the plate closing, the introduction of the rivet in the rivet hole, the upsetting of the rivet which is at the same time held by the dolly, the bringing of the rivet into its position ready for use in the rivet feeding device, the feeding of the following rivets and the return movement of all the parts into their initial position. g i

The machine is also suitable for countersunk pull through riveting. The 'countersinking in the plates 11, 18 is effected by the rivet driving-in die 22. The centering pin I02, owing to its resilient mounting, retracts into the snap 9| so far that its end face is in the same plane as the upper edge of the snap.

I claim:

1. A machine with pressure medium drive for riveting perforated plates especially those with varying rivet spacing, comprising incombination a work table, a snap mounted in said work table and adapted to form the tail, a resiliently mount-' 'ed centering pin slidable in said snap and adapt-' ed to engage the workpiece, a plate closer arranged above the.workpiece, a 'rivet driving in die shiftably mounted in said plate closer, a piston controlling said plate closer, a piston controlling said rivet driving-in die, a driving press workpiece and forceback the resiliently mounted centering piece, and finally to the piston of the press actuating the, snap to form the rivet tall, the rivet driving-in die remaining on the set head as a dolly.

2. In a machine as specified in claim 1, 9. cylinder accommodating the piston controlling the rivet driving-in die, and having an aperture adapted to be opened after the driving-in of the rivet and to supply pressure medium "to the piston controlling the snap.

3. In a machine as specified in claim 1, 9. cylinder accommodating the piston controlling the I rivet driving-in die and having an aperture adapted to be opened when said piston reaches the end of its stroke and to supply pressuremediu-m to the rivet feeding device.

4. In a machine as specified in claim 1, cylinders each accommodating one of said pistons, return springs one on each of said pistons, the shut-off element constructed as piston slide valve, and a return spring ,acting on said piston slide valve, said shut-oi! element adapted in its initial position to connect an of said cylinders with the atmosphere.

. KARL WEINHOLD.

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