US1990998A - Punching and riveting machine - Google Patents

Description

L5M. MARCHA/v7' A2 Sheets-Sheet 1 ATTORNEYS.

Feb. 12, 1935. l.. 1 MARCHANT PUNGHING AND RIVETING MACHINE Original Filed' March 20, 1951 Feb. 12, 1935. MARCHANT 1,990,998

PUNCHING AND RIVETING MACHINE Original Filed March 20, 1951 2 Sheets-Sheet 2 HQ. 2 Hq. 5

ff L. MARCH/ANT A TTORNE YS v Patented` Fell). l2,` 1935 UNITI-:o STATESf PATENT l(il-FICEv rUNcmNG AND vmvri'rnm MACHINE l Les nrnrcnmt, mesurait-.anca

Application March 14 Clillll.

Ihis invention relates to a punching and riveting machine. Theobject o! the invention is to provide a machine which both ypunches work to form a rivet-receiving aperture, and then which inserts a rivet and completes the riveting operation. The invention contemplates doing both these operations while the work is in a single position thus materially facilitatinghandling of the work and riveting two or more pieces together.

In the accompanying drawings:

Fig. 1 is a perspective of a machine for carrying out the invention.

Fig. 2 is an enlarged view showing some of the mechanism. v

Fig. 3 is a view looking at the mechanism from the right hand side ot Fig. 2.

Fig. 4 shows the parts in punching position.

Fig. 5 shows the parts in position with a rivet about ready to enter the work.

Fig. 6 shows the dnished riveting operation.

Fig. 7 is a detail in section showing the anvil and punch.

The machine may take ,various forms but one structure may include a machine base 1 with s post 2, an anvil arm 3 and a rivet head 4. The particular mechanism in the rivet head is not shown nor specifically claimed as a commercial riveting mechanism or rivet driving mechanism may be employed. The machine may be power driven as by means of a motor 5 driving suitable parts such as a wheel or the like in housing 6 upon the shaft oi which is a crank 7 and crank arm 8 for driving the riveting mechanism when a clutch'S is closed. The anvil may contain or house a suitable punch and may be power driven es by means of a belt 10 running over a pulley 11 arranged to operate a pitman 12 mounted upon an eccentric positioned between two supporting devices 13, there preferably being an interposed clutchi.

Now taking up the anvil and punch construction: a

The anvil proper comprises a part 15 (Fig. 2) which is hollow and in which is a punch 16 reciprccebly mounted. A plunger 17 is mounted in the anvil and has an exposed end 18 arranged for contact with one end of an arm of bell crank 19 connected to the pitman l2. When the eccentric makes arevolution the bell crank is swung and the punch forced upwardly by the plunger to the position shown in Fig. 4. To throw in the clutch 14 for punch operation there may be a foot lever 20 heid normally up by spring 21, there being a control rod zo, 1931, sei-uu No. 523,956 Marsh z3. 1934 v 22 slidably mounted in an arm 23 of a bell crank lever for' operating the clutch 14. When the control lever 20 is depressed an abutment or nut 24 rocks the arm 23k and throws in clutch 14. The details of the clutchneednot be shown as any standard clutch may be employed.

A secondary anvil in the form of a shoe 25 is provided for backing up the work against the action of the punch. The shoe 25 has an anvil proper portion 26 which is hollow and it is controlled by bell crank lever 27 connected to the shoe by a link 28. The control rod 22 extends through one end oi the arm .oi bell crank 27 and is associated therewith by compression spring 29. The shoe 25 is also. pivotally mounted as at 30 to a sliding bar 31 milled out as at 32. This sliding bar is normally held upwardly by coil spring 33, one end oi which is connected to the bar 3l and one to the housing.

The first operation is to punch the work. Two or more pieces oi stock to be riveted are placed over the anvil 3, then the lever 20 depressed. This rocks the bell crank 27 which swings the shoe 25 through the means oi. link 28 counterclockwise until the curved surface 34 strikes the base of the milled out portion 32 or sliding bar 3l. In this position the anvil 15 and the seoondary anvil 26 are on substantially the same centers. Upon further movement of the bell crank 27 the bar 31 is urged downwardly against the action of spring 33 in which movement the secondary anvil 26 moves axially and abuts the work so that the work-is engaged between the anvils as shown in Fig. 4. When this occurs the abutment 24 rocks arm 23, upon continued movement of the lever 20. with the spring 29 becoming compressed and causing the work to be tightly clamped between parts 15 and 26. This throws in the clutch 14 which, due to the mechanism above described, urges the punch 16 up through the work, as illustrated in Fig. 4; the punched out part of which may escape through the hollowed secondary anvil 26. The lever 2G is now released, returning the bell crank to its normal inoperative position, but the punch V18 remains in its upwardly urged position. as shown in Fig. 4, with the plunger 18 advantageously falling back down with the bell crank 19. The punch 16 may be merely held up by its frictional contact with the work. The shoe 25 is returned to its normal position,y as shown in Fig. l. As the bell crank 27 rocks, the first movement is that of the upward sliding movement ofil the bar 31 by action of spring 33 thus lifting the secondary anvil 26 axially oil. the punch and after it is free of the punch it then may swing on its pivot 30 to its inoperative position.

At this time the work is held positioned by the punch and it is ready to receive a rivet. The rivets may be hollow and are fed down a chute 40 by any suitable feeding means, and a suitable selector mechanism 41 (not shown in detail) may be provided for letting one rivet at a time fall into the riveting head. The rivet is received between two separable rivet- holding devices 42 and 43 held closed against each other as by means of springs 44 which are mounted upon the reciprocating bar 45 spring pressed upwardly byspring 46. A rivet set 47 is carried bya driver 48 connected by a link 49 with bell crank 50 which in turn is connected to pitman arm 8i. By reference to Fig. 3 it will be noted that driver 48 and bar 46 are located side by side and that the springs 44 are shaped so as to position the devices 42 and 43 in axial alignment with the punch. i

A control lever 51 is now rocked and by mean of rod 52, the clutch 9 is engaged as the rod 52 is connected asat 53 with the clutch control lever. Due to the pitman 8 the bell crank 50 is rocked and the driver 48 depressed. The rivet set 47 pushes downwardlyon the rivet and through the means of a rivet carries the bar 45 down until'it is stopped by means of a suitable set screw or the like 55. end of the rivet, which is lowermost, substantially extends over the upper end of punch 16. The rivet is now driven down through the holding devices 42 and 43 by which action they are forced open, which is permitted by fiexure of springs 44, as shown in Fig. 5 whereupon the rivet and the rivet set 16 are driven down ytogether with the punch 47 extending through the devices 42 and 43, as shown in Fig. 6. 'I'he rivet is driven through the aperture in the work formed by the punch 16 simultaneously with the action of forcing the punch 16 out of the aperture and the lower end of the rivet is turned over by anvil 15. The lever 51 may now be released and the parts returned to their normal position ready for another cycle of operation.

Briefly reiterating one cycle of operation, it may be stated as follows:

Two or more pieces of work are placed over anvil 3; an aperture is formed by the punch 16 with the driving parts of the punch 16 returning to normal position leaving the punch 16 up in the work. The shoe 25 moves in to back up the work during punching operation, and then moves back out of the way. The rivet head is now operated and the rivet is driven down, transferred from the holding devices 42 and 43 to the punch and thereupon is guided down by the punch as the driver and rivet set 47 descend. It will be noted that the aperture formed by the punch 16 is not quite as large as that required by the rivet so that the rivet is very tightly engaged in the small aperture as it must be forced therethrough.

A machine of this kind is advantageous in many arts where two pieces or work can be riveted together. Sheet metal parts for airplanes may be advantageously riveted in this manner. Considerable time and trouble is necessary where two pieces of work are first properly punched and then removed to a riveting machine because it necessitates accurately holding two or more parts of work together, and it also requires the more or less difficult task of very accurately aligning the punched out openings for the reception of a rivet.-

All this is eliminated in the present machine; that is, the two pieces of work are placed together,

At this time the open punched and then held in position by the punch to receive the rivets. As a result, where two separate positions of the work have been heretofore required for first punching and then riveting through the punched aperture but a single position is required with the present machine which performs both the punching operation and riveting in the same position of the work.

I claim: n l 1. A punching and riveting machine comprising a iixed anvil, driving means for driving a rivet against the anvil, a punch slidable in the anvil and a shoe for backing up thev punch.

2. A punching and riveting machine comprising a fixed anvil over which work is placed, a punch slidable in the anvil, a shoe for engaging the work opposite the punch, means for actuating the punch through the work, means for moving the shoe to and from cooperating position with the punch, and rivet driving means for driving rivets through the punched work and clinching the same against said anvil.

3. A punching and riveting machine comprising a fixed anvil over which work is placed, rivet driving ,means for driving a rivet against the anvil, a punch slidable in the anvil, a shoemovable into and out of cooperating relation'with said punch, on the opposite side of the work from said anvil, means for driving the punch through thework with the punch sliding in the anvil, means for swinging the shoe to back up the punch, and means for driving a rivet through the punched work. n

4. A punching and riveting machine comprising a fixed anvil over which work is placed, a punch slidable in the anvil, means for urging the punch through the work and for leaving the punch in a position extending through the work, a shoe movable into and out of Work engaging position opposite the anvil to back up the punch, and means for driving a rivet through the work and against said anvil.

5. A punching and riveting machine comprising an anvil over which work is placed, a punch in the anvil, means for urging the punch through the workand for leaving the punch in a position extending through the work, a shoe movable into and out of work engaging position opposite the anvil to back up the punch, means for driving a rivet through the work and against said anvil, said last. named means comprising rivet guiding means movable to release the rivet whereby the rivet is transferred from said guiding means to thereby be guided by the punch as it is driven through the work.'

6. The combination with an anvil over which work is placed, of a punch in the anvil, a shoe for clamping the work against the anvil, means for actuating the punch while said shoe is backing up the work, the shoe being pivotally and slidably mounted and adapted tovbe moved into and out of operative position, and rivet driving means for driving aQ rivet through the work in a direction opposite the movement of the punch in punching the work.

7. In a punch and riveting machine, the combination of a vertically disposed anvil, a vertically movable punch therein, a swingable and slidable shoe, means for moving the shoe against the work opposite the anvil whereby the work is clamped between the shoe and anvil, means for driving the punch up through the work, means for retracting the shoe, and rivet driving means for driv-y ing a rivet through the work from the shoe engaging side oi the work and for driving the punch out oi the work simultaneously.

8. A punching 'and riveting machine compristhe work and the rivet driving means, and forV moving the shoe substantially axially of the anvil to clamp the work between the anvil and shoe, means for actuating-the punch up through the work while it is backed up by the shoe, means for retracting the shoe with axial movement, then swinging movement, said punch being adapted tul remain punched through the work, and means for driving a rivet toward the punch and through the work, said punchbeing driven out oi its punched position and serving to guide the rivet through the punched aperture.

9. A punching and riveting machine comprising an anvil, a shoe opposite said anvil movable into and out of work engaging position, the said shoe cooperating with the anvil while in work engaging position to clamp the work in place for punching, a punch reciprocably mounted in said anvil, means for projecting the punch beyond said anvil and through said work while clamped between the anvil and shoe and for leaving the punch in such projected position, a rivet holder for releasably holding a rivet in aligned relation with the punch, and a rivet set for releasing the rivet from said holder and driving the rivet into engagement with the punch, through the work and against the anvil to upset the rivet whereby the punch is retracted from said projected position and ejected from the punched hole in said work.

10. A punching and riveting machine comprising an anvil having an opening therein, a shoe opposite said anvil for backing up the work during the punching operation and movable into and out of work engaging position, a punch movably mounted in the opening in said anvil and projectable to a position where a portion oi the punch extends beyond the mouth of the opening and retractable to another position where the punching end of the punch is substantially adjacent the mouth of the opening, means for projecting the said punch through the work to form a hole therein, a rivet holder for releasably holding a rivet in aligned relation with the said punch, the said punch while in projected position extending through the work to align the hole in the work with the rivet, and a''rivet set for releasing the rivet from the holder and driving the rivet through the hole in the work and against the anvil and retracted punch to upset the rivet, the said rivet while being driven through the hole in the work engaging the punch to eject the same from the hole in the work and return the punch to retracted position.

1l. A punching and riveting machine comprising an anvil having an opening therein over which the work to be punched and riveted is placed, a punch reciprocably mounted in said opening and projectable to a position where a portion oi the punch extends beyond'the mouth of the opening and retractable to another position where thepunching end of the punch is substantially iiush with the mouth of the opening, means for projecting the punch through the work to form a hole therein, a rivet holder for releasably holding a rivet in aligned relation with the punch, the said punch while in projected position extending through the work to `align the hole in the work with the rivet, and

a rivet set for releasing the rivet from the holder and driving the rivet through the hole in the work and against the anvil and retracted punch to upset the rivet, the said rivet while being driven through the hole in the work engaging the punch to eject the punch from the hole in the work and retract the punch to its retracted position with the punching end of the punch flush with the mouth of the opening in the anvil whereby the punch serves as a part oi the anvil in the upsetting o! the rivet.

12. A punching and riveting machine comprising an anvil over which the work is placed, means for punching a'hole through the work and maintaining the work in position on said anvil with the hole aligned with the rivet set, a rivet holder for releasably holding a rivet, and a rivet set for releasing the rivet from the rivet holder, driving the rivet through the hole in the work and against the anvil to upset the same, the rivet upon being driven through the hole in -the work ejecting the aforesaid means from the hole in the work.

1331A punching and riveting machine comprising an anvil having an opening over which the work is placed, means reciprocably mounted in said opening for punching a hole in said work and projectable beyond the mouth oi'. the opening while engaging said work in said punched hole to maintain said work in position on said anvil with the hole aligned with the rivet set, a rivet holder for releasably holding a rivet, and a rivet set for releasing the rivet from the holder and driving the rivet through the hole in the work and against the anvil to upset the same, the rivet while being driven through the said hole engaging the aforementioned means to eject the same from the holein the work.

14. A punching and riveting machine compris- -ingan anvil with an opening therein over which the work is placed, means ior punching a hole in said work including an element reciprocable in the opening in the anvil and projectable beyond the mouth of said opening while engaging the work in the punched hole to maintain the work in position on the anvil with the hole aligned with the rivet set, the said element being retractable by the rivet while being driven through the hole in the work to a position flush with the mouth oi the opening in the anvil to serve as a part of the anvil in the upsetting of the rivet, a rivet holder for releasably holding a rivet, and a rivet set for releasing the rivet from the holder and driving the rivet through the hole in the work and against the anvil and retracted element to upset the rivet.

` LEE L. MARCHANT.

CERTIFICATE or CORRECTION.

mimmo. 1,990,998. February 12, i935.

LEE L. MARCHANI1L- It is hereby certified that error appears in the printed specification of the above numbered potent requiring correction as follows: Page. 2, first column, line 36, for "rivet set" read punchand vline 37, .for "punch" read rivet set and that the said Letters Patent should be read with th' y Leg! i'e Frazer (Seal)` Acting Commissioner of Patents.

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