US2310836A - Riveting machine - Google Patents

Description

Feb. 9, 1943. K. BUTTER RIVETING MACHINE Original Filed Oct. 14, 1938 2 Sheets -Sheet l a a l m. if

Inventor ARLBUTT R K. B UTTER RIVETING MACHINE Feb. 9, 1943.

Original Filed Oct.

14, 1938 2 Sheets-Sheet 2 Patented Feb. 9, 1943 RIVETIN G MACHINE Karl Butter, Rostock, Germany; vested in the Alien Property Custodian Original application October 14, 1938, Serial No.

235,043. Divided and this application February 9, 1940, Serial No. 318,164. In Germany November 17, 1936 10 Claims.

The present invention relates to a machine for riveting together sheets of metal or other material, for instance profile irons, and it relates in particular but not necessarily exclusively to a machine for riveting together thin imperforate sheets which are to be perforated by the shanks of the rivets, of the character disclosed in my -tol. 78-48) shank through the sheets, a holding device is arranged on the upper part i of the machine. Said device comprises two slides 30 mounted on the lower side of a plate 3| fastened to the upper with an opening 33 for the stamp 6 to pass copending application, Serial No. 235,043, Patent No. 2,215,388, of which the present application is a division.

It is an object of the present invention to provide a riveting machine comprising a reciprocable stamp, an apertured holder-up opposed to said stamp, and a spindle receivable within said holder-up to form therewith a snap-head die.

It is another object of the invention to provide a machine for riveting together imperforate sheets by means of countersunk rivets and incorporating for this purpose a countersunk holder-up.

It is a still further object of the invention to provide a machine by means of which imperforate sheets may be riveted together with a speed and ease comparable to the sewing together of fabrics by means of a sewing machine.

Other objects and advantages of the invention will become apparent from the following description, with reference to the accompanying drawings, of which Fig. 1 is a sectional elevation of a machine constructed in accordance with one embodiment of my invention;

Fig. 2 is a broken-away elevation, partly in section, of one form-of drive for the reciprocable piston illustrated in Fig. 1; and

Fig. 3 is a detail further illustrating the piston drive.

Referring to the drawings, the machine comprises a tool l6 rigidly mounted on the head of the lower part 2 of the machine. A rest for the sheets to be riveted is integral with a bridge 21 guided by means of bolts 28 on the head of the lower part 2 and subject to the action of springs 28a tending to hold the bridge in the position shown. A bush 29 integral with the bridge 21 fits over the tool I6, which has a countersink Mia, and centres the bridge 21.

A spindle 2| of a piston 22 moved up and down by means of an eccentric 23 is constructed to enter the hollow tool It so that its upper surface is flush with the countersink |6a and forms therewith a snap-head die for the shank of a rivet l3 struck through the sheets 3 and 4. To hold the rivet in suitable position when the stamp 6 of the machine during its downward stroke strikes the head of the rivet to strike its through. The slides 30 are connected by means of screws 35 to spring-pressed bolts 34 adjustably mounted on the plate 3| and tending to close the jaws of the slides 30 around the shank of the rivet |3 which is in suitable position for being struck by the stamp. The plate 3| is provided with lateral bearings 36 for the suspension of toggle levers 31, the free ends of which cooperate with the spring-pressed bolts 34 to open the jaws of the slides 30 when a sleeve 38 ar ranged on the stamp 6 strikes the toggle levers 31.

If the parts of the machine are in the positions shown, a rivet l3 having been put by hand or by any suitable feeding mechanism into the opening 33 of the plate 3|, it is held by the jaws of the slides 30 in the suitable position for being struck by the stamp 6 through the sheets to be riveted which have been placed on the bridge 21. Just before the stamp 6 strikes the head of the rivet l3 the sleeve 38 strikes the toggle levers 31 to push back the slides 30. As soon as the rivet has been freed from the jaws the stamp touches the head of the rivet and presses it downwards together with the sheets 3 and 4, against the yieldingly mounted bridge thereby to yieldingly clamp the sheets against the bridge. The bridge 21 follows the downward movement until it rests on the surface of the head of the lower part 2 of the machine. In this position the hollow tool I6 is engaged by the lower workpiece 4 so that the stamp in its further stroke strikes the rivet through the workpieces at the same time pressing the thin sheets into the countersink of the tool Hi. The parts of the workpieces stamped out fall through the hollow tool l6 on to the piston 22 which may be provided with an opening (not shown) to allow the parts stamped out to be carried off. Now, the piston 22 with the spindle 2| is lifted by means of the eccentric so as to enter the hollow centre of the tool. The stamp 6 stops its downward stroke and is allowed to lift by about the amount by which the bridge 21 was previously lowered, during which retracting movement the work sheets are maintained clamped against the bridge. The tool It together with the top of the spindle 2| now forms a snap-head die. The stamp now moves downwardly again on shaft d which is supported in the piston 22.

Upon rotation of the eccentric disc 0, the eccentric 23 is moved up and down. This movement is transmitted by means of shaft d to piston 22' and hence to spindle 2|.

I claim:

1. A riveting machine comprising a reciprocable stamp, rivet-supporting means comprising spring-pressed jaw members, an abutment carried by said stamp, pivoted levers connected with the jaw members and operable by said abutment during an operative stroke of said stamp to separate said jaw members, a resiliently mounted work support, an abutment for limiting movement of said work support in the direction of the operative stroke of said stamp, a fixedly mounted holder-up, a passage in said work support for receiving said holder-up upon movement of said work support in the direction of the operative stroke of the stamp, a passageway in said holder-up and a reciprocable spindle receivable within said passageway toform with said holderup a snap-head die.

2. A riveting machine comprising a reciprocable stamp, rivet-supporting means comprising spring-pressed jaw members, an abutment carried by said stamp, pivoted levers connected with the jaw members and operable by said abutment during an operative stroke of said stamp to sepa rate said jaw members, a resiliently mounted work support, an abutment for limiting movement of said work support in the direction of the operative stroke of said stamp, a fixedly mounted holder-up, a passage in said work support for receiving said holder-up upon movement of said work support in the direction of the operative stroke of the stamp, a passageway in said holder-up, a reciprocable spindle receivable within saidpassageway to form with said holder-up a snap-head die, and means for reciprocating said stamp and said spindle in timed relation.

3 A machine for riveting imperforate work pieces comprising, in combination, a reciprocable stamp operative to strike a rivet through thework pieces, means for holding a rivet in position to be struck by said stamp, an apertured holder-up opposed to said stamp for holding up the work pieces during striking of the rivet therethrough, means adapted to position the work pieces to be riveted in operative position on the holder up, and a reciprocable spindle mov able into said holder-up following the striking through of the rivet to form therewith a snaphead die.

4. A machine for riveting imperforate work pieces as set forth in claim 3, wherein the work positioning means includes a support against which the work pieces are clamped for the duration of the riveting operation.

5. A machine for riveting imperforate work pieces as set forth in claim 3, wherein the working positioning means includes a support which is resiliently urged away from the holder-up and against which the work pieces are clamped for the duration of the riveting gperation.

6. A machine for riveting imperforate work pieces comprising, in combination, a reciprocable stamp operative to strike a rivet through the work pieces, means for holding a rivet in position to be struck by said stamp, a holder-up opposed to said stamp for holding up the work pieces during striking of the rivet therethrough and being apertured to receive the shank of a rivet struck through the work pieces, a spindle,

receivable within said holder-up to form. therewith a snap-head die, and means for actuating.

the spindle into the holder-up following striking through of the rivet, whereby to form a closure head on the rivet.

7. A machine for riveting imperforate, work, pieces, comprising, in combination, a reciprocaa ble stamp operative to strike a rivet through the work pieces,'mean's for holding the rivet in position to be struck by said stamp, a fixedly mounted holder-u for holding up the work during striking through of the rivet and being apertured to receive the shank of the rivet struck through the work pieces, a reciprocable spindle movable into through of the rivet to form therewith a snaphead die, and means providing a surface for initially supporting the work pieces and against which thework pieces are clamped during the operative strokes of the stamp and spindle.

8. A machine for riveting imperforate work pieces as set forth in claim 3, wherein the stamp is partially retracted following striking through of the rivet and is thereafter given a second working stroke following movement of the spin--v of the rivet and is thereafter given a second working stroke following movement of thespindle,

into the holder-up.

10. A machine for riveting imperforate work pieces as set forth in claim '7, wherein the :stamp is partially retracted following striking throughof the rivet and 'is' thereafter given a second, working stroke following movement of the spin dle into the ho'Ider-upl 1 KARL BUTTER,

said holder up following the striking,

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