US2365824A - Riveting device - Google Patents

Description

Dec. 26, 1944. K. N. KEESLER RIVETING DEVICE Filed April 28, 1943 2 Sheets-Sheet 2 filvAle-mA fki-z's4se,

INVENTOR.

ATTORNEY.

'ated by pressure fluid supplied Patented Dec. 26, 1944 arvn'rmo DEVICE 1 Kenneth N. Keesler, Burbank, CaliL, assignor to Consolidated Vultee Aircraft Corporation, a

corporation of Delaware Application April 28, 1943, Serial No. 484,817

2 Claims.

This invention pertains to an improved riveting device particularly adapted for riveting operations in sheet metal construction and characterized by the provision of an automatic bucker which is automatically and positively brought into contact with the foot of the rivet and effectively maintained in contact 'with such foot during the riveting operation. In this manner a single operator may rapidly and effectively rivet pieces of metal together without the necessity of having an assistant operate a bucking tool. Moreover, it is not'necessary for the operator to move the material being riveted against a stationary bucker, thereby greatly expediting the work and permitting the riveting operation to be carried out on partly assembled units or in positions where riveting by one operator has not been accomplished heretofore.

Generally'stated, the present invention pertains to a device j'adapted' for use with a fluid pressure riveting hammer, the device being suitably positioned with respect to the riveting hammer so as to-be available for use atall times. The device constitutes-an automatic bucker actuated by pressure fluid supplied to the riveting hammer and is preferably so arranged as to cause the bucker to move into positionand into contact with the foot of the rivet as soon as the rivet set of the riveting hammer has been positioned on the head of the rivet and the trigger of the hammer has been depressed or pressure fluid supplied to the hammer in any suitable manner.

An object of the present invention, therefore, is to disclose and provide a device-particularly adaptedfor use with pressure fluidactuated riveting hammers whereby a bucking surface is Fig. 1 is a side, elevation of one arrangement in which the present invention may be embodied. Fig. 2 is a front elevation of the bucker partly broken away.

Fig. 3 is a sectional .view taken through the handle and a part of a pressure actuated riveting hammer showing means for supplying pressure fluid to the automatic bucker.

Fig. 4 is a diagrammatic representation of a modified form of valve adapted for use in a riveting hammer with which an automatic bucker'is to be employed.

By referring to the drawings and particularly to Fig. 1, it will be noted that a pneumatic rivet- .ing hammer I provided with a handle 2, a trigger 3 and a pressure fluid inlet connection 4, this hammer being of any suitable design or type, is

held as by means of a clamp 5 at one end of a leg 6 .of a U-shaped yoke generally identified at I. The clamp 5 may be of any suitable design and is preferably provided with means for removably holding the riveting hammer I.

The yoke I is preferably tubular. and 8 of the yoke may be held together as by means of a turnbuckle or double-ended screw- 9 so as to permit minor adjustment between the ends of the legs. of the yoke. The length of the legs or fork II) is attached as, for example, by means brought into contact with 'the rivet concurrently with the initiation of the riveting operation.

A further object of the invention is to disclose and provide an automatic bucker which is'actuto the .riveting hammer.

A still further object of the invention is to disclose and provide an automatic bucker which employs fluid pressure used in actuating the riveting hammer and which imparts a secondary blow to the foot of the rivet in timed relation to the blows of the riveting hammer.

These and other objectatuses and advantages of the present invention will become apparent to those skilled in the art from the following detailed description. In order to facilitate understanding. reference will be had to the appended drawings, in which:-

of pins Ii and machine screws l2. The supporting member 10 is provided with a boss l3 which may be integral with the member ll).

A bucking head, generally indicated at I4, is provided with a bore l5 adapted to slidably receive the'boss l3 for movement thereon toward and away fromthe riveting hammer I held by the opposing leg 6 of the yoke. Guide means may be carried by the support I0 and adapted to cooperatively engage the bucking head. For ex-' ample, the support I0 may be provided with a pair of guide rods I6 extending through bores formed in the bucking head I4. Guide rod [6 may be held in position by means of set screws H. A cavity l8'may be formed in the bucking head, said cavity being adapted to receive a spring l9- held in position by a removable pin 20, the spring being adapted to yieldably urge the bucking head away from the riveting hammer I. A removable anvil-block 2| may be carried by the bucking head M, the anvil block being in alignment with the rivet mer -l.

The legs 6 set 22 of the riveting hamv The handle 2 of the riveting hammer is provided with a suitable valve 24 actuated by the trigger 3 and adapted to supply pressure fluid, such as compressed air, from the source of supply connected to the port 4 to the riveting hammer I as by means of a conduit 25. This conduit may be tapped by means of a nipple 26, the nipple.

being connected as by means of a flexible hose 2! and collars 28 and 29 to a nipple 30 in communication with a conduit leading to a tube 3| extending through theyoke 1. The tube 3| is suitably anchored in the flange 8' carried by the end of leg 8 and communicates with bores 32 and 33. A spindle 34 provided with an axial bore and radial passageways leading from such bore to a circumferential groove 35, extends through the boss l3 and provides means for supplying pressure fluid to the space within the bore l of the bucker l4. .The inner end of the spindle 34 may be threaded so as to receive a nut 36 adapted to hold a cup leather 3! upon the outer end of the boss 13, thereby adequately sealing the cylinder or bore I5. The'outer end of the spindle 34 may .be provided with a slotted head in order to facilitateassembly or repairs.

In operation, the device described hereinabove is applied to the work which extends between the immediately flows through nipple 28, flexible hose 27, nipple 3!], tube 3|, conduits 32 and 33, and 'through the axial bore of the spindle 34 into the 1 cylinder of the bucker l4, forcing the bucker, and

particularly the anvil 2| thereof, into pressure contact with the foot of the rivet. Simultaneously, the riveting hammer l is energized to cause the rivet set 22 to hammer against the rivet.

It has been found desirable to make themovable bucker I4 of such mass that the bucker resists the blows of the hammer. The inertia of the bucker should be such that it does not readily bounce away from the foot of the rivet, and it also should not fail to return. The mass and inertia of the bucker l4 and the diameter of the bore-l5 (in comparison with the effective .piston area within the hammer I) should be such as to cause the bucker l4 to maintain contact with the foot of the rivet for at least a part of the time consumed by each reciprocation of the rivet set 22 of the hammer I. In other words, the bucker l4 may vibrate under the influence of the blows of the riveting hammer upon the head of the rivet but the factors above disclosed should be suflicient to cause the bucker to return into contact with the foot of the rivet at some part of each hammer blow.

A flexible hose 21 has been provided between the nipples 26 and since the handle 2 of the'hammer I need not be maintained in the position illustrated in Fig. 1. Some operators prefer to have the handle inclined with respect to the plane of the yoke l and the flexible hose connection 2'! permits suitable adjustment of the handle 2 of the riveting hammer with respect to the yoke 1.

On certain types 01 work it is highly desirable that the bucker come into position and into contact with the foot of the rivet slightly prior to the instant at which the riveting hammer is energized. This may be attained by employing two valves operated successively by the trigger 3, the first valve furnishing pressure fluid to the bucker and the second valve furnishing pressure fluid t0 the riveting hammer. Instead of two separate valves, a single balanced slide valve may be employed and a diagrammatic representation of such valve appears inFigr'l.

As shown in Fig. 4, the trigger 3 moves the valve body element 24', this valve being so arranged that ports leading to conduit 25 (in communication with conduit 21 which leads to the bucking head) are opened slightly in advance of the ports which communicate with conduit 25 leading to the riveting hammer I. A single movement of the trigger, therefore, successively causes pressure fluid to be supplied to the bucking head and hammer in that order.

It will be evident to those skilled in the art that the bucking head here disclosed need not be made a part of a portable yoke such as is illustrated in the drawings. The bucking head may be firmly attached to a table, work bench or the like, above which a riveting hammer is either positioned or held, the work being then brought into position between the bucking head and the hammer. When made a part of a portable yoke as shown in the drawings, a single operator may perform efllcient riveting in various and sundry positions.

An automatic fitting device for fitting rivets may be made a part of the yoke 1, this addi tional element automatically fitting and positioning rivets immediately in front of the rivet set 22 so as to facilitate the riveting operation, increase the number of rivets which may be driven within a given period of time by an operator, and to a large extent effect an economy in rivets in that no rivets are accidentally dropped or improperly driven because of deviation from a predetermined angle with respect to the Work.

These and other changes, modifications and adaptations of the invention coming within the scope of the appended claims are embraced thereby.

I claim:

1. A riveting device comprising: a yoke, a fluid pressure operated riveting hammer held by one end of the yoke and provided with a valve for controlling the admission of pressure fluid to said hammer, a fluid pressure operated bucking head assembly held by the other end of the yoke, said bucking head assembly including a support, a boss thereon, a bucking head provided with a bore adapted to slidably receive the boss in substantially fluid-tight relationship therewith for movement thereon toward and away from the riveting hammer, means carried by the support and slidably engaged by the bucking head for guiding movement thereof, spring means carried by said support and yieldably urging the bucking head away from the riveting hammer, conduit means for admitting pressure fluid to the riveting hammer under the control of said valve, conduit means extending from said valve to and through said yoke for admitting pressure fluid to the bore in the bucking head to force the head toward the riveting hammer, and means for adjusting the spread between the ends of said yoke whereby to vary the distance between said riveting hammer and bucking head according to the thickness of work to be riveted.

2. A riveting device comprising: a yoke formed of a tube bent into a generally U-shape, a fluid pressure operated riveting hammer held by one hammer, a fluid pressure operated bucking head assembly held by the other end of the yoke, said bucking head assembly including a support, a boss, a bucking head provided with a bore adapted to slidably receive the boss in substantially fluid-tight relationship therewith for movement thereon toward and away from the riveting hammer, a, guide rod aflixed to the support parallel to the boss and slidably engaged by the bucking head for guiding movement thereof, a spring carfrom the riveting hammer, conduit means foradmitting pressure fluid to the riveting hammer under the controlof said valve, conduit means extending from said valve to and through said yoke for admitting pressure fluid to the bore in the bucking head to force the head toward the riveting hammer, and means for adjusting the I spread between the ends of said yoke by spring-

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