US1079783A - Riveting-machine. - Google Patents

Description

N. MARSHALL. RIVETING MACHINE. APPLICATION FILED FEB. 3, 1910.

1,079,783, Patented Nov. 25, 1913.

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N. MARSHALL.

RIVETING MACHINE.

APPLICATION FILED FEB. s, 1910.

Patented Nov. 25-, 1913.

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zczy aw N. MARSHALL. RIVETING MACHINE. APPLICATION II-LED FEB. a, 1910.

' Patented Nov. 25, 1913.

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NORMAN MARSHALL, OF NEWTON, MASSACHUSETTS.

RIVETING-MACI-IINE.

Specification of Izetters Patent.

Patented Nov. 25, 1913.

Application filed February 3, 1910. Serial N 0. 541,872.

To all whom it may concern:

Be it known that I, NORMAN MARSHALL, a citizen of the United States, residing at Newton, in the county of Middlesex and chines, and more particularly to a machine by which the parts of articles or devices may be quickly and conveniently secured together by rivets passing through holes in the parts. A machine of this character embodying the invention may be used with especial advantage in securing together the metallic parts or the metallic and porcelain parts of lamp sockets and various other electric fixtures which have heretofore commonly been secured together by screws, although the invention is not limited in its application to machines for securing together the parts of any particular article or device.

One object of the invention is to provide means for accurately positioning the work for the introduction of the rivets into the rivet receiving holes preparatory to the presentation of the work to the riveting mechanism.

To this end one feature of the invention contemplates the provision in a machine provided with riveting mechanism of one or more alining devices arranged to enter and position the rivet receiving holes, and having provision for removal for the introduction of the rivets and the operation of the riveting mechanism thereon. The alining device or devices may be of any suitable construction and arrangement, and are preferably in the form of pins or fingers of a size to fit within the rivet receiving holes. By means of the alining device or devices, the rivet receiving holes in the parts which are to be secured together are brought into accurate alinement, and the relative position of the parts is unaffected by manufacturing imperfections or variations in the parts of successive articles acted upon. 7 The specific construction of the work supporting devices by which the work is presented to the riveting mechanism, and the relative arrangement of these devices and the alining fingers, is not material to the above features of the invention in their broader aspects, and may be modified to best suit the conditions under which the invention is to be used. It is preferred, however, to so construct the work supporting devices and riveting mechanism that they are relatively movable into and out of riveting relation, and to provide alining fingers arranged to engage the rivet receiving holes inthe Work when the work support and riveting mechanism are out of riveting relation. This construction is of especial advantage in machines for securing the parts of porcelain bases, since the introduction and removal of the alining fingers before the work is presented to the riveting mechanism serves to remove the greater part of the porcelain dust from the holes, thus reducing the wear on the more expensive anvil dies of the riveting mechanism. This construction also enables the parts of the work to be conveniently placed on the work support.

The above features of the invention, as well as further features which contribute to the simplicity and efficiency of a machine embodying the broader features, will be understood from the accompanying drawings and the following detailed description of the machine shown therein. I

In the drawings Figure 1 is a front elevation of a machine embodying the various features of the invention; Fig. 2 is a side elevation of the machine; Fig. 3 is a partial sectional view on line 33, Fig. 2; Fig. 4 is a sectional view on line H, Fig. 1; Fig. 5 is a sectional view on line 55, Fig. 1; Fig. 6 is a sectional view on line 66, Fig. 2; Fig. 7 is a detail sectional view through the plunger carrying slide of the riveting mechanism; and Fig. 8 is a detail elevation of a part of the rivet feeding mechanism.

The features of the invention are illustrated in the accompanying drawings embodied in a machine especially designed and adapted for securing together the screw shell and porcelain base of an incandescent lamp-socket by means of tubular rivets which extend through holes in the base and shell and have their tubular ends spread and clamped against the flange of the shell. In this'machine the parts to be secured together, namely, the screw shell and porcelain base, are positioned upon a work support, with the rivet receiving holes in accurate alinement by means of aliningdevices in the form of fingers which enter the rivet receiving holes. After the rivet receiving holes have been thus brought accurately into alinement, the parts of the work are held in place while the alining devices are withdrawn and while the rivets are inserted and acted upon by the riveting mechanism.

In the'construction shown, the devices for supporting and carrying the work comprise a series of cylindrical supports 1 carried upon the periphery of a carrier drum 2 and adapted to fit snugly within the metallic screw. shell A of an incandescent lamp socket.

By an intermittent rotation of the carrier 2, the work supports are brought successively into position to receive the shell A and base B of the socket, and then into position to present the parts to the riveting mechanism. The carrier is intermittently rotated through a ratchet wheel3formed on its rear face and arranged to be engaged by a pawl 4 mounted upon a pawl carrying lever 5. The lever 5 is mounted to turn upon a bearing 6 formed on thehub 7 of the carrier, and is operated bya cam 8 secured to an intermittently rotating shaft 9. The end of the pawl carrying lever is held in engagement with the cam by a spring 10. The shaft 9 is connected through bevel gears 11 with a vertical shaft 12 which is in turn connected through bevel gears 13 with the main driving shaft 14: of

the machine. The main driving shaft is driven intermittently through a clutch indicated generally at 15. This clutch may be any well-known form of clutch which will when thrown into operation drive the main v driving shaft through one revolution and 7 port by the operator.

then throw out. The clutch may be conveniently engaged to start the machine through a treadle 16 connected with the clutch by a link 17 and bell crank lever 18. Through this mechanism the shaft 9 is given a single revolution each time the machine is thrown into operation and advances the carrier 2 the distance between successive work supports to transfer a work support from the position where the parts of the work are placed thereon into position to register with the riveting mechanism and to bring a succeeding work support into position for the application of the parts of the work thereto. WVhen a work support 1 is in work receiving position indicated at No. 1, Figs. 1 and 3, the'metallic shell A and the porcelain base B are placed in position upon the work sup- The parts are correctly positioned with relation to each other and. the rivet receiving holes brought aecurately into alinement by means of alining devices in the form of two fingers or pins 19 which extend through radial holes 20 in the work support, and project sufliciently to enter the rivet receiving holes in the porcelain base and flange of the screw shell. After the parts have been accurately positioned, and the rivet holes alined by the fingers 19, the parts are held in position upon the work support by a clamping lever 21 pivoted upon a bracket 22 and forced against the base B by a spring 23. The spring 23 is so arranged with relation to the pivot of the clamp that it will retain the clamp in open position when it is swung about its pivot to enable the removal of the parts from the work support.

After the clamp has been engaged with the base B, the alining fingers 19 are withdrawn to permit the introduction of the rivets, and so that they will not interfere with the rotation of the carrier in bringing the work into register with the riveting mechanism. In order that the pins may be thus retracted and again advanced when the succeeding work support is brought into work receiving position, they are carried by a slide 24 mounted for radial movement in guideways formed in a stationary supporting bracket 25. The inner end of the slide rides upon a cam 26, and the slide is forced radially inward by springs 27 surrounding the fingers 19 and interposed between the outer end of the slide and the inwardly projecting end of the bracket 25 through which the pins pass (Fig. 5). The cam 26 is secured upon a shaft 27 which passes through the hub 7 of the carrier 2 and is connected through bevel gears 28 with the vertical shaft 12. When the machine is at rest the cam 26 is in the position indicated in Figs. 1 and 3, and holds the slide 24: in its outer position, so that the alining fingers 19 project through the holes 20 in the work supports, and are maintained in position for receiving the work. When the machine is started, the shaft 27 makes a single revolution in the direction of the arrow, Fig. 1. At the beginning of this revolution the cam 26 passes from under the slide 2 1, so that the alining fingers are immediately retracted and do not interfere with the advance movement of the carrier imparted thereto by the pawl and ratchet mechanism above described. After the advance movement of the carrier has been completed, and as the shaft 27 completes its revolution, the cam 26 advances the fingers 19, projecting them through the holes 20 of the next succeeding work support, ready for the application of the work thereto.

The riveting mechanism shown comprises two anvils 29 for spreading the tubular ends of the rivets R, and two cooperating hammers or plungers 30 for engaging the heads of the rivets and forcing the tubular ends against the anvils. The anvils are formed on the upper ends of two pins or plungers 31 which are arranged to project through the holes 20 in the work support when the work support is brought into rivet setting posi tion. In order that these pins may be withdrawn so that they will not interfere with the advance movement of the carrier2, they are secured in a slide 32 mounted to move radially in guideways formed in the-bracket 25. The inner end of the slide rides upon a cam 33 secured to the shaft 27, and the slide is forced radially inward by springs 34 surrounding the pins and interposed between the slide 32 and the inwardly projecting end of the bracket through which the pins pass. The plungers or hammers30 are mounted in a slide 35 mounted for vertical reciprocation in an arm 36. 'The slide is supported upon a spring 37 and is operated by a cam 38 secured to the shaft 14. The plungers 30 are yieldingly mounted in the slide 35 and are forced downward by springs 39 of sufficient strength to secure the proper riveting action by the plungers and anvils.

The tubular rivets by which the parts are secured together may be introduced into the rivet receiving holes manually, but it is preferred to provide means for feeding the rivets into position beneath the plungers 30 and for carrying and delivering them into the rivet receiving'holes during the downward movement of the plungers. The devices shown for thus feeding and delivering the rivets comprise guideways 40 down which the rivets may slide, and rivet carrying jaws 41 arranged at the ends ofthe guideways. The rivets may be separated and delivered individually to the guideways by any well-known form of separating mechanism. The rivet carrying jaws are recessed to embrace the shank of the rivet, and are provided with conical recesses for receiving the heads of the rivets. The jaws are carried upon the lower ends of spring arms 42 which are secured to a yielding slide 43. The slide is supported to hold the jaws in register with the lower end of the guideway 40 by a spring 44 interposed between a collar 45 secured to the slide and a lug 46 in which the slide is guided. The lower side of the collar 45 forms a stop for limiting the downward movement of the rivet carrying jaws.

When the machine is started, as above described, the revolution of the shaft 27 immediately carries the cam 33 out from under the slide 32, so that the anvil pins 31 are withdrawn during the advance movement of the carrier 2. After the advance movement of the carrier has been completed, and the work which was applied to the work support at position No. 1 hasthus been broughtinto register with the riveting mechanism, the anvil pins. 31 are projected through the work support by the cam 33 and the plungers 30 are forced downward by the cam 38.

As the plungers 30 move downward their lowerxends engage the heads of the rivets R and carry the rivets downward. The jaws 41 move down with theri-vets until the lower ends of the rivets have entered the rivet receiving holes in .the base B, and then the collars 45 engage the lugs 46 and arrest the further downward movement of the jaws. As the plungers 30 continue downward, the heads of the rivets engaging the conical recesses in the jaws force the jaws apart, so that the rivets are carried down between the jaws, and their lower tubular ends brought against the anvils 29. The anvils act to support the lower tubular ends of the rivets, bending the ends outward and over against the flange of the shell, so that the shell and porcelainbase are firmly clamped between the head of the rivet and the flange formed at the tubular end of the rivet. The plungers 30 are then raised into the position indicated in Fig. 1, and the machine stops; When the machine is again started, the same cycle of operations takes place, and the united socket and shell are carried into position No. 3.

While the construction and arrangement of parts shown and described is the most desirable and eflicient which I have as yet devised, it will be understood that this construction and arrangement is not essential to the broader features of the invention, and may be varied and modified without departing therefrom,

Having explained the nature and object of the invention, and specifically described one form in which it may be embodied, what I claim is 1. A riveting machine, having, in combination, a riveting mechanism, a work support and an alining device arranged to engage rivet receiving holes in the work when the support is in work receiving position and position them in alinement with each other, and means operating independently of the rivets for removing the alining devices for the introduction of the rivet, substantially as described.

2. A riveting machine, having, in combination, a riveting plunger and anvil, a work support and finger arranged to engage rivet receiving holes in the work, means for projecting and withdrawing the finger, means for transferring the work support from position to register with the finger to position to register with the plunger and anvil, and means for retaining the work in position after the withdrawal of the finger, substantially as described.

3. A riveting machine, having, in combi- IMtlOILH/ riveting plunger and anvil, a finger anvil, and means for retaining the Work in arranged to engage rivet receiving holes in position after the retraction of the finger, the Work, a Work support movable from substantially as described.

position to register With the finger to posi- NORMAN MARSHALL. 5 tion to register with the plunger and anvil, Witnesses:

meansfor projecting and retracting the fin- N. D. MCPHAIL,

ger, means for projecting and retracting the WARREN G. OGDEN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C.

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