US1218426A - Broaching-press. - Google Patents

Description

H. W. LOCKLEY.

BROACHING PRESS..

APPLICATION FILED AuG.II, I9I6.

Patented Mar. 6,1917. I

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APPLICATION F|LED'AuG.11,.1916. y I A 1,218,426. Patented Mar. 17. f 5 SHEETS-SH I.

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l BROACHING PRESS.

APPLICATION FILED AuG.lI. |916.v

'Patented Maf.' 6, 1917-. l

HARRY w. LocKiuEY, or NEW cA-sTLE, PENNSYLVANI.

IBROACHING-PRESS.

i Specification of Letters Patent.

Application filed August 11, 1916. Serial No. 114,444.

To all whom t may concern.'

-Be it known that I, HARRY IV. IJOGKLEYj 'a citizen of the United States, residing at New Castle, in the county of Lawrence and State of Pennsylvania, have invented certain new and useful Improvements in Broaching- Presses; and I do decla-re the following to be a full, clear, and exact description of the l invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention which has reference broadly to improvementsin broaching presses relates more .particularly to those designed for accurately finishing the bores of bronze and brass bushings.v Heretofore, presses of this character have been almost universally provided with clutches controlled by foot pedals and by means of these pedals the working head has been stopped after each broach has been forced through a bushing,

and while said head remains in this idle position, an additional bushing and broach have been inserted beneath it, whereupon by actuation of the foot pedal said head is again brought down. This method hasbeen found to require considerable time since the press cannot work at its maximum capacity due to the fact that it is successively stopped and started. Y

It is the object of the present invention to so improve upon broaching presses as to perbeing supplemented by the accompanying drawings which constitute a part of this application and in which:

Figure l is a side elevation of a broacliing i' press equipped with the improved features of construction;

Fig. 2 is a top plan view of the table and the parts carried thereby ;l

Fig. Bis an end elevation of the parts 'shown in' Fig. 2;

Figs. 4, 5 and 6 are vertical transverse sections on the planes'of the lines 4 4, 5-5 and 6,-6 of Fig. 2;

Fig. 7 is a longitudinal section 'on the plane of the line 7-7 of Fig. 2 showing one broach and bushing inposition for the for- .nier to be forced through the latter by the working head and illustrating another bushing and broach supported by the reciprocating feed member;

F ig. 8 is a view similar to Fig. 7 showing one broaching tool forced. substantially through a bushing and disclosing the other tool and bushing in position to be fed beneath the work head by the proceeding stroke of the reciprocating member;

Fig. 9 is a horizontal section taken' substantially on the plane of the line 99 of' Figl 3;

Fig. 10 is a plan view of the reciprocating feed member.

In specifically describing the structure shown in the drawings above briefly described, similar characters will be employed to designate corresponding parts throughout the several views and reference will be herein made to the numerous elements by their respective indices. To this end, the numeral' 1 designates a -suitable base from which the usual standards 2 risc, said standshaft 3 which is driven by means of suitable gearing from a main power wheel 4. An electric -motor 5 is preferably provided for driving the wheel Li, the two being connected y by means of a belt 6, and the speed of said motor and therefore the speed` of the entire machine', may be regulated at will by a suitable rheostat 7. A common type of vertically moving working head or ram v8 is 0perated continuously from the crankshaft 3,

being connected therewith 'by a pitman 9. For discontinuing movement ofthe working head-8 for any reasonwithout stopping the motor 5, the standard clutch (not shown) is .employed for connecting the crank shaft 3 with the driving means thereof, said clutch being controlled by the usual foot pedal which is illustrated conventionally at .P in Fig. l. This pedal and clutch referred to are standard equipment and will for the most part be used only vwhen setting or adju sting the machine or making a quick stop. The parts so far briefly described are of well known formation and the construction thereof bcnstitutes no part ofthe present inratentea iviar. c, wir. A

ards supporting at their upper ends a crank Y' coperate with the parts of the press to vention, although the details of the latter which reference has been made.

- I face of the tableJ 12.

Mounted on a Asuitable rectangular frame 10 spaced below the head 8 and secured to Asaid frame by bolts or the like 11 is a hori- ".*A relatively fixed angle metal guide bar 15 .extends across the table 12 from the rear edge of said table toward the front edge thereof, the horizontal ange of said guide havingtransverse slots' 16 through which lmachine screws 17 pass to secure the guide.

adjustably in place. The guide 15 as shown clearly in Fig. 6, is disposed, above one edge of the work supporting ring 14, while dis. posed vabove the opposite edge thereof in spaced parallel relation with said guide r15 is a second guide bar` 18, the lower edge of the latter being provided with laterally extending fianges 19 which rest slidably on the table 12 beneath a bar 20 which is secured in place by machine screws or the like 21.A An abutment bar 2 2 is adjustably secured by .bolts 23 and slots 24 to the table 12 and is spaced outwardly from the guide bar 18, coil springs 25 being interposed between said bars 18 and 22 whereby the former will be yieldably forced toward the bar 15, the utility of this structure being hereinafter, described.

In substantial' alinement with the bar 15 Aand extending from the horizontal flange thereof through the front edge of the table 12 is a groove 26 formed in the upper face of Asaid table, said groove receiving slidably therein a lblock 27 shown in detail in Fig. 10,'this block being connected by means of an integral arm 28 with a feedmember 29 in the form of a rectangular head .equal in height to the bars 15 and 18, the rear end of said head having a V-shaped vertically extending groove 30. A guide plate 31 is secured to the table and overlies the block 27 and arm 28, said plate having therein a longitudinally -extending slot 32 .through which a vertically disposed Vstud 33 extends, said stud being threaded into the block 27 while the upper end thereof is provided with a head 34.

pivoted by means of a bolt or the like 36 to the head 34, the rear end of this rod being pivoted to the upper end v'of a bell crank lever 37 fulcrumed to one of the standards 2, the1other end of said lever bleing'pivoted to the lower section of 'an expansible andcontractible pitman rod' 38 .Which at 39 is connected eccentrcally with a disk 40 on the crank shaft 3. It will thus be evident that as this shaft is rotated, the rod 38 will reciprocate vertically and that the bell crank 37 will transfer this motion to move the rod 35 horizontally, thus causing the feed memi ber 29 to alternately proceed toward the rear of the table 12 andrecede toward the front edgel thereof.; In a manner to be described, this proceeding and receding movement of the member 29 serves tosuccessively position unfinished bushings on the ring 14 in which position a broaching tool is forced therethrough by downward movement of the working head 8.

A work holder 42 is disposed at'and in a plane above the front ends of the guide bars 15 and 18, said holder comprising briefly a pair of jaws 43 and 44, the former adjustablysecured by means of bolts 45 to the table 12 kand preferably having a rib 4G traveling in a transverse groove 47 in the upper side of said table. The j aw 44 is provided on its lower side with a rib 48 received slidably in a transverse groove 49 in the upper side of table 12. The body shown clearly in Figs. 2, 3 and 4. A set screw 52 is threaded through an ear 53 rising from the outer end of the jaw 44and by tightening or loosening this screw, it will be seen that the active face of said member 44 may be correctly spaced from 43.

In operation, the motor 5 will be driven at the properspeed,l which speed is under the control of the rheostat 7, and said motor, through. the driving connections described will reciprocate the working head 8' and the feed member 29 in timed relation, said head being moved downwardly as soon as member'29 is moved to the limit of its rearward stroke. The bushings B are placed in the work holder 42 oney at a time when the feed member 29 is at or near the limit of its rearward movement (Figs. 2 and 7), said bushings resting on said member29, aI broa'ching `tool l having been previously inserted in the bushing as. will be clear from Figs. 7 and 8. As the feed member 29 now recedes from the posi-tion shown in Fig. 7 to that portion of the jaw 44 is slidably mounted in l a suitable guide 50 which is secured to the -table 12, a spring 51 being interposed between this guide and the jaw proper as depicted in.Fig. 8, the bushing which has 29 now moves again. rearwardly the bush- The front end of a horizontal rod 35is ing and tool will be positioned beneath the .working head or ram 8, and as the latter now moves downwardly, said tool is forced through the bushing and will be deposited into a boxy or the like not shown. While this is taking place, the operator places another unfinished bushing and a tool applied thereto within the workholder 42 and as these bars are formed on their inner opposed faces with verticalgrooves 54 which, due

lto the coil springs 25, yieldably gripv the bushings to retain them in operative position on the'ring 14 while the broach is being forced therethrough. When the next bushing is forced rearwardly the springs 25 yieldand thus permit the finishedV bushing to move toward the rear end of the machine at which all of the bushings are discharged after the broaching process. To -prevent unnecessary binding of the bushings between tlie rear ends of the bars 15 and 1S, the latter is preferably decreased in thickness in rear of its groove 54 as indicated at 55.

In case the operator should insert a bushing into the work holder .42 as one end of the feed member 29 is movingacross the lower end of said holder, no serious accident will occur since the lspring 51 will yield out wardly and will thus allow said member 29 to force the bushing free of the holder.

By constructing the machine to operate in the manner above described, much more .work can be accomplished since; it operates continuously rather than intermittently as -is the casewith most broa'chin'g presses now in use. It has been found that from four to seven times as many bushings .may b e broached in a day byjthe improvedinachine as can be finished by the machines now being employed for thisfpurpose.

In the foregoing, I have described certain specific details'ofconstruction for accomplishing probably the best resultsand due to the fact that themachine operates to great advantage when manufactured in this manner, the organization of parts shown and describedconstitutes the preferred form of my machine. It is to be understood, however, that within the scopeof the inventio-n as claimed, numerous changes may -be made without sacrificing the main advantages thereof. The machine is not .limited to -broachin bushings or to a 4hand feed since it is o vious that 4 it may be used'for other purposes and that any suitable mechanical or gravity feed may be used.

I claim 1. In a breaching press, the combination of a work holder for retaining bushings in place while the broaching process is being performed, a non-rotating proceeding and receding feed member for feeding bushings to said holder, and a second work holder over the feed member for retaining the unfinished bushings inA Vupright position on said feed member during the receding strokes thereof, said feed member and second work holder permitting said bushings to drop by gravity onto the proceeding path of the former at the completion of said `receding strokes, said second holder being immovable when the machine is properly operating but being expansible transverselyyof the lineof travel of the feedin-ember to prevent injury to the bushings or machine in case one 0f the former should bind lin said holder. l

2. In a breaching press, the combination of a table, a work holder for retaining 'bushings in place while the breaching process is being performed, a non-rotating proceeding and receding-feed member movable toward and away from .said work holder for feeding the bushings thereto, and a'secoiid work holder above said feed member for retaining the unfinished bushings in upright position on said feed member upon the receding strokes of thev latter, said member permitting the bushings' to drop by gravity onto its proceeding path at the completion of its receding strokes; said second work holder consisting of a relatively fixed jaw adjacent one side of the feed member, a guide secured to said table at the other side of said member, a second jaw in said guide and slidable transversely of the line of movement of the feed member, andl spring means for holding said second jaw in operative position, said second ]aw being wardly in case Aa bushing should bind in said second work holder.

3. A broaching press comprising a holder in which bushings or the like are adapted to .immovable when the machine is properly operating but being adapted to yield out-.

be held while the breaching process is being performed, said holder comprising a hori- 'zontal support, a fixedhorizontal bar eX- tending along thisJ upper side of said support,

a movable-horizontal 'bar parallel with and spaced horizontally from the fixed bar, and spring means for forcing the movablebar toward the fixed bar to gripthe bushings while being and for a vlimited time after being broached, the inneropposed faces of said bars having seats to engage opposite portions of said bushings while the broachingprocess is being performed in combina-l 4vtionwitli means for feeding the bushings linto the holder l 4. ,A broacliing press comprising a holder in which bushings or the like are adapted to be held while the broacliing process is being performed, said holder comprising a horizontal support, a fixed bar extending along' the upper side thereof, a relatively movable bar parallel with and spaced horizontally from said fixed bar, outwardly lprojecting .fianges on the lower edge Aof said movable bar, a guide bar overlying said fianges and secured to the support, a second fixed bar spaced outwardly from said guide bar, and springs interposed between said VirY second fixed bar and the movable bar for forcing the latter toward the first 'fixed bar to grip the bushings betaveegn the two while being and for a limited timei'after being broached; in combination with means for feeding the bushings into the space between lglie first named fixed b'arand the movable 5. A broaching press comprising a work holder in whichbushingsfcr the like are adapted to be heldwhile the broaching process is being performed, ,a non-rotating proceeding and receding feed member for feeding the bushings to said holder, said feed member having a flat straight upper side, andaV horizontal table upon which said holder is mounted and adjacent the upper.

side of which said feed member operates; v1n combinatlon with a second work holder comprising a VYpair of jaws secured to the afore-y said table on opposite'sides of the feed' member and extending to spaced points above'4 said feed member, said jaws serving to loosely hold therebetween the bushings to permitY them to rest on said flat side of the feed member during its receding strokes and to drop in` advance of said feed member on the proceeding strokes thereof.

6. In a broaching press, the combination of a horizontal table, a proceeding and receeding feed member mounted slidably on said table, an operating rod Aconnected with said member, a pair of horizontal guide bars resting on, said table on opposite 'sides of and extending beyond said feed member,

means for permittingone of said bars to4 Y :move toward the other, spring means for so moving said one bar, both bars having transverse grooves 'in their linner faces to receive the bushings while the broaching process is being performed, and a work holder above the feed member to receive the bushings, said feed member moving beyond said work holder on its receding strokes to permit the bushings therein to drop onto so moving said one bar, both' bars vhaving transverse grooves in their innerf-aces -to receive the bushings while, the broaching process 1s being performed, an Yangular iaw the combination y having vone end disposed above the feed` member and its other end secured to the table at one side of the feed member, a guide secured to said table at the other side lof said member, a second angular jaw received slidably in said guide and having one end disposed over the feed member for cooperation with the corresponding end of the first jaw, both of said jaws having vertically 4extending grooves to loosely' receive the bushings to Lbe broached, .and a spring `intery posed between the second named jaw 'and the guide thereof for normally forcing this jaw inwardly but for permitting it to yield outwardly in case of accident, the aforesaid feed member moving beyond the two jaws on its receding strokes to permit the busliings held by said jaws to drop onto the table in advance of said feed member'to be forced by the latter into the grooves ofthe aforesaid bars.

y In testimony whereof I have hereunto set my hand in the presence of two--siibscribing witnesses. f'

HARRY w. LocKLEY.

Witnesses: l o

" WALTER S. REYNOLDS REssA' M. FRANCIS,l

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