US1733327A

US1733327A - Come along for metal-drawing machines

Info

Publication number: US1733327A
Application number: US219162A
Authority: US
Inventors: George E Barnhart
Original assignee: Individual
Current assignee: Individual
Priority date: 1927-09-12
Filing date: 1927-09-12
Publication date: 1929-10-29
Anticipated expiration: 1946-10-29

Description

Oct. 29, 1929. G. EBARNHART COME-ALONG FOR METAL DRAWING MACHINES Filed Sept. l2, 1927 una @www ,Sv @WW W? kd.

www 0c 29p 1929 ,27

GEORGE E. BARNHART, 0F PASADENA, CALIFORNIA COME ALONG FOR METAL-DRAWING MACHINES Application led September 12, 1927. Serial No. 219,162.

This invention relates to the art of forming ward end of which is forked or slotted as metal objects, suchy as tubular or rod-like indicated at 12 to receive a follower 13, such products by the operation of drawing the follower consisting of a plate or bar slotted same through suitable dies or forming deas indicated at 14 to receive bolts 15, which 5,; vices, being more particularly a novel come extend through the forked end of the carriage 55 along or gripping head arranged to impart 11, such mounting of the follower on the a positive movement of the Work through carriage 11 allowing a certain limited longithe dies or forming devices. tudinal movement of the follower in the carlt .is one of the-principal objects olf my riage. The follower is provided withadowni@ invention to produce a come-along of simple Wardly extending linger or abutment 16, 69 form and construction, edective to rmly which is designed to engage between the links grip thin walled material and so arranged ot a chain 17, the finger 16 engaging the pins as to, by simple operation of the return moveor rivets 18 of the chain. rlhis chain 17 may ment of the come-along,quiclrly release such be of any desired form, preferably of the ie material. endless chain type, adapted to be driven by e5 Another object of my invention is to pron sprockets from a power source, as will be vide a come-along having gripping or wedge understood by those skilled in the art. The blocks interiorly surfaced to enter the sur rear end of the carriage 11 is slotted horizontace oit the material or stoclr to a predetertally, .as indicated at 20, to receive a cam plate no mined distance and thereby prevent slippage 21, such cam plate being' pivotally attached .'fo

ot the stock during the working operation. to the carriage by means of a headed bolt or Another object ot my invention is to propin 22, retained in place by means of a Cotter vide a come-along ot simple torni, arranged pin 23..

to grip material or stock in the torni ota a 'llhe cam plate 21 is provided with two at tube without pointing the tube as ordinarily diagonally disposed cain slots 24, such slots I5 dem, being diagonally disposed with relation to @ther objects and advantages appear herethe longitudinal. axis oi the come-along, and

inatter from the following description and rearwardly converging as illustrated in accompanying drawings. Fig. 2. ao Referring to the drawings, which are tor 25 designates two sets of bell cranl levers, so

illustrative purposes only, there being one such lever of each set dislig. 1 is a sectional elevation oil a comeposed above and the other lever being disalong einbodyinga torni oil invention. posed below the cam plate 21, as shown in llig. 2 is a plan view, artly in section, ot l. Each lever 25 comprises a long arm the corne-along shown in lig. l.. 2li and a short arm 27', the long arm ot each e5 le ig. d is a cross-sectional on line 3--3 set of levers being pivotally connected to a oi lig. headed pin. or pivotal member 28, which en d is a cross-sectional view online tends throngh slots 2li the cam plate 21'. ofig 2. The levers 25 are pivotally mounted by means abn nig. 5i an enlar ed longitudinal sectional ot pins or pivot ineinlfiers 30 in a recess 3l Q0 :ai drawings, il designates a the away troni the viert through one oi the wedge bloclrs, rfiiovvu 'formed in the rear end oi a bead the engagement ol the saine with the spaced apart by spacing collars 33. The short Stoch. arm 27 of eamch lever terminates in a rounded Fig. 6 is a plan view partly in section ol a head 84, adapted to engage the forward ends modilied torni of my invention, and of stock or material gripping wedges 35. Eig. 'E' is a cross sectional view on line 'll-fl rllhese stoclr gripping we 1ges are mounted in out d. and engageable with a circular seat 3G, formed listening-particularly to the embodiment in a central opening in. *he head 32, the inner et my invention shown in the accompanying surface or 'tace ol suol ieni ir l The head 32 is supported in the machine by means of angle bars 41, and is directed through its travel by means of guide blocks or members 40, which slide between longitudinal channels ork members 42 of such frame. The short arms 27 of the levers 25 are beveled, as indicated at 44 in Fig. 3, so as to permit Clearance for the stock, should the same extend forwardly between such levers. The stock gripping members 35 consist, in the form shown, of four sections which together form substantially a frusto conical gripping member, each having its outer face tapered inwardly and rearwardly, as shown at 45, to engagek the seat 36 in the head 32,` as shown in- Figs. 1 and 2:

Thesegripping members 35 are provided on their inner face with a series of ribs 48 designed to bite into the stock for the purpose of more securely gripping the same between the gripping members. These members 45 are also provided with'channels 49 arranged to receive spring members 50, having a tendency to expand such gripping members.

The come-along, in the form just described, operates in the following manner. It being understood that the chain 17 hasbeen engaged by the finger 16 on the follower 13,l the follower resting upon the chain as shown` in Fig. 1, the follower is moved forwardly as indicatedby the arrow-in Fig. 1 until the rear bolt 15 engages the rear end of the slot 14, whereupon the carriage is moved forwardly with the follwer and the pull of the carriage on the cam plate 21 causes the long arms 26 of the bell crank levers 25 to move inwardly in the position shown in Fig. 2. The further forward pulling movement -of the carriage exerts a further inward move- .ment of the arms 26, thereby causing pressure of the short arms 27 .against the forward endy of the wedging members 35. Such wedging members, due to their co-operative relation with the seat 36, are wedged tightly against the stock which, in the present i`stance,is shown as a tube 51, until the ribs bite into the stock. as shown in Fig. 5, thereby firmly securing the stock in the come-along. When used for drawing thin tubes, as indicated at 51, a short mandrel 52 is preferably inserted in the end of the tube and the stock engaged between such mandrel and the straight inner faces ofthe wedging members, as shown in Fig. 5, after the ribs have engaged the stock as just described. Further forward movement of the carriage draws the entire comealong forwardly, together with the stock en-` gaged by the gripping members. After the stock has traveled through the dies, generally indicated -diagrammatically at 52, the movement of the gripping chain 17 is stopped and either reversed or the follower is disengaged from the chain. In either case the follower, being moved rearwardly, the arms 26 are ipsasev opened, due to the engagement of the pins 28 in the cam slots 24 in the plate 21. Such outward movement of the arms 26 relieves pressure of the short arms against the stock engaging means, thereby permitting an opening or expanding of the members of the stock gripping means by disengagement of such members from the seat 36 in the head 32 and removal of the work therefrom. By makin the seat 36 in the head 32 short in length and the opening beveled away from such seat, as heretofore described, it will be understood that the wedging members may more freely be moved from engagement with the stock than in the case Where a long engagement is had between such seat and the stock engaging members.

It is to be understood that the straight inner faces of the wedges 35 between the ribs 48 are designed to engage the stock and at the same time limit the depth of the biteof the ribs into the stock. By so constructing the wedges va contact with the stock by the Wedges 35 is maintained throughout the length of the wedges eXce t at the grooves 49.

As to the size of the ri s 48, such ribs are proportioned so that the area of the ribs, multi'plied by the pressure exerted over the ribs, is less than the elastic limit of the stock.

l'n the form of come-along shown in Figs- 6 and 7, the head 60 receives a plurality of wedgel members 61 which are engaged at their forward ends by levers 62 pivoted thereto, the outer ends of such levers being connected by links 63 with a carriage 64, which is provided with a finger 65 to engage the drive chain 66. The carriage 64 is recessed as shown at 67 to permit free movement of the come-along rearwardly, at the end of the drawing operation, the recess 67 allowing clearance for the stock indicated at 70.

I claim as my invention:

1. A come-along for advancing work through dies comprising: a head apertured to form a circular tapered seat; a plurality of stock gripplng members having ther outer faces engageable on said seat; a plurality of levers pivotally mounted on said head engaglng said gripping members; and lever engaging means independent of said head for advancing said head and imparting grip ing movement to said stock grlpping mem ers, said levers comprising draft means for said gripping members.

2. A come-along for advancing Work through dies comprising: a head apertured to form a tapered seat; a plurality of stock gripping members having their outer faces engageable on said seat; a plurality of levers 65 mental tapered gripping members in said members, said lever engaging means consisting of a cam plate and pins on said levers engaging said cam plate.

3. LA come-along for advancing work through dies comprising: a head apertured vto form a tapered seat; a plurality of stock through dies: a hea gripping members having their outer faces engageable on said seat; a plunality of levers pivotally mounted on said head engaging said gripping members and lever engaging means for advancing said head and imparting gripping movement to said stock gripping members, said lever. engaging means consisting of a plate having rearwardly converging cam slots formed therein and means on said levers engaging in said cam slots.

4. In combination with a driven member, a come-along for advancing work through dies comprising: a head apertured to form a seat; a plurality of tapered stock gripping members engaging said seat; a plurality of levers pivotally mounted on said head engaging said stock gripping members; a plate having cam slots therein; means on said levers engaging said cam slots; supportingI means for said plate; and means for releas- -ably connecting said supporting means to said driven member.

5. In a come-along for advancing Work through dies: a head apertured to form a seat; a plurality of segmental frustro-conical gripping members engaging said seat; and means pivotally mounted on said head and engaging said gripping members for simultaneously advancing said head and applying positive pressure to said gripping members in a direction opposed to said advance for forcingsaid gripping members against said seat.

6. In a come-alon for advancing Work apertured to form a seat; a plurality of segmental frustro-conical gripping members engaging said seat; means pivotally mounted on said head and engaging said gripping members for simultaneously advancing said head and applying positive pressure to said gripping members in a direction opposed to said advance for forcing said gripping members against said seat; and means for yieldingly expanding said gripping members.

7. In combination with a driven member, a support, a head slidable on said support 'apertured to form a seat, wedge-shaped stock gripping members on said seat, bell 'crank levers plvotally mounted on said head, a short arm n said levers engaging said gripping member, a plate having cam slots therein,- long arms on said levers, pins on said long arms engaging said cam slots, and means or'advancing said plate.

8. In a come-along for advancing material through dies, a head having an aperture therein forming a seat, a plurality of segh'ad engaging said seat, and a plurality of ribs on the gripping face of said gripping members, said gripping members having corresponding recesses therein and spring members in said recesses to expand the gripping members.

9. A come-along comprising a head apertured to form a circular seat, a plurality of gripping members extending into said aperture in engagement with said seat, and a plurality of draft members pivotally mounted on said head having gripping member engaging portions engaging the ends of said gripping members.

10. A come-along comprising a head apertured to form a circular seat, a plurality of gripping members extending into said aperture in engagement With said seat, and a plurality of draft members pivotally mounted on said head having gripping member ening portions engaging the ends of said gripping members, said gripping members having recesses formed therein and split ring elastic members in said recesses for yieldingly expanding the gripping members.

In testimony whereof, I have hereunto set my hand at Los Angeles, California, this 25th day of- August, 1927.

GEORGE E. BARNHART.