US2467399A - Tapering machine drilling attachment - Google Patents

Description

April 19, 1949. E. MOYER TAPERING MACHINE DRILLING ATTACHMENT 5 Sheets-Sheet 1 Filed Oct. 2, 1946 INVENTOR.

a E Y D M D m w v D F ATTEIRNEY5 E. MOYER TAPERING MACHINE DRILLING ATTACHMENT A ia 19,1949.

5 Sheets-Sheet 2 Filed Oct. 2, 1946 INVENTOR.

YEDWAHD MEYER. B J/MW M/WQWM ATTEIRNEY5 April 19, 1949. E. MO YER TAPERING MACHINE DRILLING ATTACHMENT 5 Shets-Sheet 3 Filed Oct. 2, 1946.

- INVENTOR. EDWARD MDYEFL MwjfiM ATTURNEYE- April 19, 1949. E. MoYE I TAPERING MACHINE DRILLING ATTACHMENT 5 Sheets-Sheet 4 Filed 00 2, 1946 A A A vvvv INVEN TOR. EDWARD MEYER- v BY 4 %W,%XMMMM ATTEIRNEYEI- April 19, 1949. Y E. MOYER 2,467,399

TAPERING MACHINE DRILLING ATTACHMENT Filed Oct. 2, 1946 5 Sheets-Sheet 5 INVENTOR. E DWARD M u YER.

ATTORNEYS- Patented Apr. 19, 1949 UNITED STATES ATENT OFFICE TAPE-BIN G MACHINE DRILLING ATTACHMENT (Granted under the act of March 3, 1883, as amended April 30, 1928; 3'70 0. G. 757) 2 Claims.

The invention described herein may be manufactured and used by or for the Government for governmental purposes, without the payment to me of any royalty thereon.

This invention relates to an attachment for a tapering machine. This attachment, comprising a multiple spindle drilling machine, is arranged so that it can be lowered over a dummy cartridge case or like work piece, thus drilling a plurality of holes in the cartridge case, and then be raised off the cartridge case to permit a new cartridge case to be fed to and the drilled cartridge case to be removed from the drilling station.

It is an object of this invention to provide a drilling attachment or fixture which can be readily applied to existing machines.

It is a further object of this invention to provide a multiple spindle drilling attachment capable of quickly and efiiciently drilling a number of holes in a cartridge case or the like in a most economical manner.

More specifically, it is an object of this invention to provide in a machine for producing a taper in cartridge cases, which machine has a crankshaft and a crosshead connected to the crankshaft so as to be raised and lowered thereby, a pair of cams mounted on the crankshaft, a pair of cam followers operated by said cams, a pair of springs stressing said cam followers toward said cams, a drilling attachment carried b one of said cam followers so as to be raised and lowered by the action of the cooperating cam on said cam follower, a plurality of drills mounted in said attachment for slidable and rotary movement, a pivotally joined linkage between the other of said cam followers and said drills whereby action of the cooperating cam on said cam follower proiects the drills toward a cartridge case so that each of said drills forms a hole in the cartridge case and retracts said drills after the holes have been formed, and a motor connected to said drills to rotate them.

Those skilled in the art to which this invention pertains will readily perceive other objects and advantages of it, or such other objects and advantages will be apparent from reading of the annexed specification and drawings to which reference is here made for a further exposition of this invention.

Inthe drawings:

Fig. 1 is a side elevation of a part of a tapering machine with the drilling attachment of this invention applied to it, parts of the drawing being broken away in vertical cross section.

Fig. 2 is a vertical cross section substantially on line 22 of Fig. l on a reduced scale.

Fig. 3 is a top or plan view of the conveyer disc substantially on line 33 of Fig. 1.

Fig. 4 is a top or plan view of the drilling appliance on an enlarged scale.

Fig. 5 is a side elevation of a part of the appliance as viewed from line 5-5 of Fig. 4.

Fig. 6 is a vertical cross section of a portion of the machine substantially on line 6-6 of Fig. 5.

Fig. '7 is a view in vertical cross section on line 'l'l of Fig. 4.

Fig. 7A is a view similar to Fig. '7 with a part shown in lowered position.

Fig. 8 is a view in vertical cross section on line Bt3 of Fig. 7.

Fig. 9 is a view in vertical cross section substantially on line 9-4! of Fig. '7.

Fig. 10 is a horizontal cross section of a portion of the machine substantially on line 10-40 of Fig. 9.

Fig. 11 is a horizontal cross section on line ll-ll of Fig.7.

One embodiment of this invention, which has been selected from among others for illustration in the drawings and description in this specification, is as follows:

An existing tapering machine, to which the drilling fixture of this invention may readily be applied, consists of a frame F in which is rotatably mounted a crankshaft C which supports a crosshead H mounted for vertical reciprocating movement.

On crankshaft C is mounted a first cam 15. A first cam follower shaft it is slidably mounted in crosshead H beneath this first cam. Shaft l6 rotatably supports at its upper end first cam follower disc l'l. First cam follower spring I8 is fastened at one end by a pin 9 to the crosshead H and at its other or lower end by a pin 20 to a supporting plate 2! slidably mounted in crosshead H. Fig. 7 shows that plate 2! supports the drilling attachment as a whole and raises and lowers it in consequence of the rotation of cam l5.

Also mounted on crankshaft C is a second cam 22 which cooperates with a second cam follower disc 23 mounted at the upper end of a second cam follower shaft 24 and stressed upward by a second spring 25. Second cam follower shaft 24 is fastened at its lower end to a cam follower plate 26. Fig. '7 shows that cam follower plate 26 has a downwardly extending boss 2'! which has a cavity in it containing screw threads 28. Screw threads 2% mesh with screw threads on spindle yoke 29 and connect cam follower plate 26 to spindle yoke 29 to lower or raise spindle yoke 29 to project and retract the drills, as will be later more fully described.

Crankshaft C also has on it an indexin cam 30 against whose surface is stressed indexing cam follower 3| which is rotatably mounted on indexing cam follower lever 32 which is pivotally mounted on a stationary rod 33. At its lower end, lever 32 carries a pivot pin 34 pivotally secured to one end of a link 35, the other end of which is pivotally secured to pin 36 pivotally secured in a boss 31 projecting upwardly from the surface of slide 39. Fig. 3 shows that slide 38 has mounted on it for horizontal oscillating movement, by means of a screw 39, a pawl 40 whose outer end abuts the flat faces of successive ratchet teeth 4| which are carried on the edge of a conveyer in a form of a disc 42. Figs. 1 and 7A show that disc 42 has on its upper surface a plurality of means 43 for contacting with and holding a card tridge case or like work piece W by means of the extracting groove in it.

Referring more specifically to Fig, 7 for the details of the drilling attachment, it will be seen that the plate 2| has a recess in it containing screw threads which mesh with the like screw threads on the upper end of a hollow central housing 5I which also has at its lower end screw threads 52 meshing with like screw threads on the upper part of the inner surface of the drilling a attachment body 53 so that housing 5| and body 53 are firmly united together. Body 53 has in its upper surface a ring-shape groove into which the spindle yoke 29 moves when it is lowered.

Body 53 also has secured in it a substantially tubular guide 55 into the axial opening 56 in which the cartridge case W enters for the performance of the drilling operation. A hexagonal cap 51 is secured to the bottom of the body 53.

Figs. 4, 5, 7, 8, 9 and 10 show that body 53 has secured to it three hollow drill spindle bearings 60 by means of screws BI (Fig. 10). Each drill spindle bearing 60 has on its upper surface a perforated boss 62 through which extends a pivot pin 63 on which is mounted a second spindle link more fully described later. In the horizontally extending cavity in each of the bearings 60 is located a tubular, Phosphor bronze, drive bearing bushing 64. Each of the bushings 64 supports in its central opening an elongated stem 65 of r a driven gear 66. A key 61 fastens each of the driven gears 66 to a hollow drill spindle 68 which has on its outer surface a collar 69 against which abuts an anti-friction bearing I0 having a fiat circular surface. Threads II are formed on the periphery of the outer end of drill spindle 68 and mesh with like threads on the inner surface of a ring-shaped drill spindle collar 12 which is likewise provided with a flat circular surface confronting the fiat circular surface on bearing 10. The bounding wall of the axial opening through the drill spindle 68 is also threaded by screw threads 13 which mesh with the threads on a set screw I4 which bears at its inner end against the end of a cylindrical drill anvil I5 having at its opposite or inner end an axial opening 16 into which fits an end of a drill 'I'I.

Drill rotating mechanism a drive shaft 82 having a bevel drive gear 83 at its innerend. On the outer end of drive shaft 82 is mounted a drive sheave 84 having in its perimeter a V-shaped notch 85 for the reception of a drive belt 86. A set screw 81 secures drive sheave 84 to drive shaft 82. At its inner end drive shaft 82 has a projecting section 88 of reduced cross section which fits and rotates in a hole in body 53 formed to receive it. Drive gear 83 meshes on either side with one of the driven gears 66. The opposite side of these driven gears 66 mesh with one of a pair of idler gears 90. Fig. 7 shows that idler gears 90 are each mounted on body 53 by means of a washer 9| which is secured by a nut 92 screw-threadedly attached to the outer end of a set screw 03 which has a notch in its outer end and a frustro-conical tip 95 at its inner end which rests in a suitably formed opening 94 in the outer surface of the guide 55 and thereby aids in retaining the guide 55 in position in the body 53. Around set screw 93 is a tubular idler gear support 96 which bears on its outer surface, between it and the inner surface of idler gear 90, a tubular Phosphor bronze bushing 91.

Drilling and retracting linkage Figs. '7, 7A and 8 show that spindle yoke 29 has on its outer peripheral surface three pairs of perforated projecting bosses I00. Through the projections in each of these pairs of bosses extends a spindle yoke pin IOI which is pivotally mounted in one end of. one of the first links I02. Each of the links I02 carries at its opposite end a link pin I03 secured thereto by washers I04 and pin I05 so as to pivotally support a pair of perforated second links I06. Each of the second links I00 has at least two perforations in it through the upper of which passes the link pin I03 and through the middle of which passes the pivot pin 63 having an enlarged head I01 at one end and a recessed portion I08 at the opposite end (Fig. 8). The pivot pin 63 is secured in position for ready attachment and detachment by means of a collar I09 having a grooved outer surface in which is mounted a coiled spring IIO whose ends are connected together so that it forms a torus. Fig. 5 shows that each of the second links I06 has at its opposite end from the link pin I03 curved side walls III which lie between the flat circular surface of bearing 10 and drill spindle collar I2 and slidably abut these fiat faces so that rotation of the second links I06 about pivot pin 63 project and retract the drills 11.

Operation Cam I5 then actuates the raising and lowering linkage for the drilling attachment by means of disc I'I, shaft I6, plate 2I, and housing 5I. This lowers guide 55 over the cartridge case W so that the cartridge case assumes the position in which it is shown in Fig. 7A.

At this point, the drilling and retracting linkage comes into operation. Cam 22 actuates disc 23, shaft 2d, plate 25, spindle yoke 29, first link I02, and second link I06, whose curved-wall .I II presses against the flat circular face of bearing 1B and thus projects the drill spindles 68 and the drills 11 carried thereby, so that the inner ends of the drills 'll' pass through the perforations in the walls of the guide 55 and drill holes in the sides of the cartridge case W. Upon the completion of these holes in the cartridge case W, the drilling and retracting linkage is moved in the opposite direction by the pressure of the second spring 25 so that the drills T! are retracted and withdrawn from the holes which they have formed in the cartridge case W. The raising and lowering linkage is then operated in the opposite direction by the force of spring H3 which raises the drilling attachment so that the guide 55 is lifted off the work piece W. The next operation of the indexing linkage then removes the work piece W from the drilling station in which the work piece W is located beneath the drilling attachment.

Summary It will thus be seen that this invention provides a multiple spindle drilling fixture or attachment suitable for use with existing cartridge case tapering machines and capable of efficiently and expeditiously drilling holes in dummy cartridge cases at a rate far exceeding that capable of attainment by known machines.

I claim:

1. In a tapering machine having a rotatable crankshaft and a crosshead reciprocated by the crankshaft, a drilling attachment including, a first cam on said crankshaft, a first cam follower slidably mounted in said crosshead so as to be operated by said first cam, a first spring stress- M ing said first cam follower towards said first cam,

a drilling attachment body carried by said first cam follower, a second cam on said cam shaft, a second cam follower slidably mounted in said crosshead so as to be operated by said second cam, a second spring stressing said second cam follower towards said second cam, at least one drill carried by said body for sliding and rotating movement, a linkage interposed between said second cam follower and said drill and operable to cause sliding movement of said drill towards a work piece in response to the operation of said second cam and said second cam follower and away from the work piece in response to the operation of said second spring and said second cam follower, a motor connected to said drill so as to rotate it and thereby drill a hole in the work piece during the movement of the drill toward the work piece, a conveyor for moving a succession of work pieces through the tapering machine, a third cam on said crankshaft, a third cam follower mounted so as to be operated by said third cam, and a linkage between said third cam follower and said conveyor whereby said conveyor and the work pieces carried thereby are moved step-by-step through said tapering machine.

2. In a tapering machine having a rotatable crankshaft and a crosshead reciprocated by said crankshaft, means for mounting a drilling attachment so as to make it movable onto a work piece before the drilling operation and to make it movable off the work piece after the drilling operation is completed, including, a cam on the crankshaft, a cam follower slidably mounted in the crosshead, a spring stressing said cam follower towards said cam, and an attachment body connected to said cam follower so as to move with said cam follower in response to the actuations of said cam.

EDWARD MOYER.

REFERENCES CITED FOREIGN PATENTS Country Date Great Britain -s Aug. 10, 1931 Number

Images