US2554998A - Draw bench - Google Patents

Description

May 29, 1951 E. J. MOILVRIED ETAL DRAW BENCH 5 Sheets-Sheet 2 Filed May 14, 1947 INVENTOR EOW N J. M: II. VR/ED AND BY NORMA/V HJVYE ATTORNEYS.

May 29, 1951 E. J. MCIL-VRIED/ EI'AL DRAW BENCH 5 Sheets-Sheet 5 Filed May 14, 1947 INVENTORJ EDWIN J. M: IL VR/ED AND BY NORM/Ml HJVYE 06% 'r {M61011 ATTOk/VEYS May. 29, 1951 E. J. MOILVRIED :rAl.

DRAW BENCH Filed May 14, 1947 5 Sheets-Sheet 4 INVENTORS EDWIN J. Ma ll. VR/ED n/vo By NORfiAN H. NYE- 4TTONEY6 May 29, 1951 E. J. MOILVRIED ETAL DRAW BENCH 5 Sheets-Sheet 5 Filed May 14, 194

INVENTORJ EDW/IV J. Ma/L VIE/ED AND BY NORMA/V HJVYE w QTTOkA/EYJ.

Patented May 29, 1 951 UNITED STATES PATENT orrrcr.

hoga Falls,- Ohio, assignors tojlhe Vaughn Machinery Company, Cuyahoga Falls, Ohio, a corporation of Ohio Application May 14, 1947; Serial N: 748 U8-2 12 Claims.- 1

This invention relates to draw benches and particularly to heavy duty draw benches for draw i'ng tubular and rod stock.

The prior draw benches of this general type consist generally of an elongated track onwhich a gripper carriage is arranged to travel in opposite directions and along which it is propelled by a driven chain or ehains. In general, these prior benches are of two types. Qne type is that ii! which the track is supported from beneath by suitable posts or standards and the gripper carriage is supported on the tracks so that its grippers are positioned directly above the track, the drive chain being arranged so that the driving portion is at a level between the carriage and track and the returning portion is below the track level. v

The other prior type is one in which the track is suspended from the top (if 1arge C=shaped rip right standards and the carriage, in turn, is suspended directly below the track, the chain be: ing positioned above the level o'f'tl ie carriage so that the space beneath the path of the carriage is unobstructed.

There are several disadvantages in these types of benches. In the former, the stock being drawn is directly above and very close to the track and chain and must be removed by aro'w or side dumping devices which inove laterally of the track into and out of the vertically limited space between the stock, on the one hand. and the track and chain therebeneath, on the other. Not only are these devices and their operating mechanism very expensive, but also, in heavy duty benches. the bulk and weight of the dumping devices makes the solution of this problem diflicult. The difiiculty is increased due to the fact that the dumping devices generally cannot be moved into position until the carriage has passed beyond them in the drawing direction.

The overhead track type of benches eliminates some of these objections but requires large and expensive c -shaped standards, greater height of equipment, and other structural features which render it less desirable for heavy duty inmany respects.

The principal objects of the present invention is to provide a heavy duty draw bench by which heavy tubular and rod stock may be drawn efficiently and safely and may be readily discharged by being dropped vertically from the drawing position into a large clear space which afiords adequate room for operation of dumping devices and the like by which the stock is handledand 2 removed from'the drawing side after the drawing -.operation.

Another object is to provide a new and improved releasable mechanism for connecting the carriage to the driving chain for effecting both the drawing and return stroke of the carriage with greater safety and eificiency.

Other objects and advantages will become apparent from the following description wherein reference is made to the drawings, in which:

Fig. 1 is a side elevation of a preferred embodimentof our invention;

Figs. 2 and 3 are enlarged fragmentary cross sectional views on lines Z -"=2 and 3=-"3 respectivey;

Fig; 4 is an enlarged top plan view of the gripper carriage and a'portionof the track illustrated in Fig. 1;

Fig. 5 and 6 are front and rear elevations respectively of the carriage illustrated in Fig; 4;

Fig. 7 is a fragmentary side elevation of that end portion of the track and chain which is farthest removed from the die end of the bench;

Fig; 8 is a fragmentary cross sectional view taken on line 8 -8 of Fig; 6;

Fig. 9 is a fragmentary horizontal sectional view illustrating the gripper and gripper operat-' ing mechanism of the gripper carriage and is taken on line 99 of Fig; 3.;

Fig} 10 is a sectional view taken on line Ill-=10 of Fig. 9;

Fig; 1-1 is a cross sectional view taken online I- l'-'H of Fig.2; and

. Fig. 12 is a fragmentary detail view of the means interconnecting the draw carriage with the-driving chain.

Referring to the drawings, the draw bench comprises generally anelongated trackton which a gripper carriage 2 is mounted for movement towardand away from a drawing die stand which, in Fig. 1, would be located at the left hand end of the track I. The carriage is driven by an endless chain 3 which passes around sprockets 4 and 5 arranged at opposite ends of the track I; The sprockets are driven through a reduction gear mechanism 6 by a suitable reversible power. means, such as a reversible electric motor 'l,- so that the chain can be driven clock wise, in Fig. 1, for the drawing stroke of the car riage and counter clockwise I01 the return stroke;

The track I carried by the upper laterally extending arms ,H! onstandards or posts ll of generally B sha-ped vertical cross section. The bases of the standards underlie the trackand extend laterally thereofbeyond its opposite side 3 so as to underlie the path of the carriage 2, as best illustrated in Figs. 2 and 3.

Carried on the upper faces of the arms I closely adjacent the track are scuff plates l2 which extend parallel to the track and support the chain so that its upper surface is near to the upper level of the track and in a position for easy access from above.

The bases of the standards ll support a scuffchannel I3 for accommodating the slack side of the chain and are provided with sloping portions I4 which slope downwardly in a direction toward the opposite side of the track from the upright portions of the standards and in underlying spaced relation to the path of the gripper carrying portion of the carriage 2. The portions I4 merge with a horizontal platform portion I5 of the standards.

Referring next to Figs. 2 thru 6, the carriage 2 comprises a rigid housing in which a pair of supporting rollers 2| are mounted for rotation about horizontal transverse axes. The rollers 2| are arranged one near each end of the carriage at the top thereof so as to roll along the top surface of the track I and support the carriage for travel endwise of the track.

The carriage has rigid lateral gripper housing portion 22 which, when the carriage is supported by the rollers 2i lies wholly to one side of the track and as close as possible thereto. Since the grippers, later to be described, are located in the portion 22, any pull imparted to them imposes a turning moment on the carriage 2 about an upright axis. To counteract such a turning moment, the portion 22 is arranged to lie between the levels of the upper and lower limits of the track and thrust rollers 23 are mounted in the housing 20 for rotation about upright axes and engage the sides of the track.

In the form illustrated, four thrust rollers 23 are provided at each end of the carriage 2. The rollers 23 at each end of the carriage are arranged in pairs, the rollers of the upper pair engaging the upper lateral margins of the track at points directly opposite from each other and the rollers of the lower pair engaging the lower lateral margins of the track at points directly opposite each other and directly below the corresponding rollers of the upper pair.

The arms l0 are preferably in the form of hollow castings having integral upright top and bottom flanges 24 to which the tread portions 25 of the track are detachably secured and interlocked by bosses 26 which interfit with suitable channels of the tread portions.

Due to the fact that the chain and gripper housing portion 22 are closely adjacent the sides of the track the twisting moment imposed on the carriage by the chain and draw of the stock is reduced to a minimum consistent with the heavy drawin force applied.

In order detachably to connect the carriage 2 to the chain 3 for driving the carriage in either direction and for releasing the carriage from the chain at the proper positions, the carriage is provided with a connecting arm 21. The arm 21 is secured by one of its ends to the carriage by a transverse pivot or shaft 28, the connected end being in alignment endwise of the carriage with the gripper portion 22 of the housing 20. The arm 21 extends from its connected end generally parallel to the carriage part way of its length, then laterally thereof into overhangin relation to the chain, th unconnected end being positioned directly above the chain 3 and being in the form of a hook 29. The hook 29 is shaped to pass between the links of the chain 3 when the arm is swun about its pivot 28 into fully lowered position. The face 30 of the hook 29 toward the gripper end of the carriage is concave and shaped to fit part way about the connecting pins between adjacent chain links. In this position of the arm 21, the carriage 2 is connected to the chain for driving in the drawing direction.

The opposite face 3| of the hook 29 is rounded and in the form of a cam which is shaped, as illustrated, so that upon movement of the chain in the return direction, the connecting pins between adjacent chain links engage the surface 3! and wedge the hook upwardly so as to disconnect the arm 2'! from the chain.

In order to keep the hook from jumping out of engagement With the chain in event of a sudden release or reduction in the draw resistin pressure exerted on the carriage, such as occurs upon the trailing end of the stock passing out of the die, a detent 32 is pivotally mounted between yoke arms 33 on the rear of the hook 29. Ilhe detent 32 is arranged to extend downwardly between the links of the chain with the hook, in a position to be engaged by the connecting pins between the links when the chain and carriage are moved in opposite directions from each other, as for example by initial movement of the chain in the return direction or by overrunning of the table in the driving direction of the chain upon sudden reduction of the pull on the grippers. The detent 32 is normally held in position in the path of the pins by a spring 34. The spring 34 is strong enough to hold the detent in extended position so as to transmit to the carriage a sufficient amount of the driving force of the chain to drive the carriage on its return stroke against the normal frictional resistance. On the other hand, the spring is sufficiently weak to permit the detent to be moved to a retracted position by the chain when the resistance to return travel of the carriage is increased due to jammin or striking the usual end stop. If the chain continues its movement in the carriag return direction after the carriage is arrested, the connecting pins between the chain links successively retract the detent 32 and engage the cam surface 3| of the hook and lift the hook and along with it the detent 32, out of driven relation to the chain, the hook bumping harmlessly along the surface of the chain so long as the return movement of the chain continues.

As mentioned, the housing portion 22 of the carriage 2 is arranged to accommodate grippers for engaging the stock to be drawn.

The grippers and their operating mechanisms are best illustrated in Figs. 3, and 8 through 10. As there shown, three grippers are used. Mounted in the front of and closing the housing portion 22 is a stationary wedge plate 35 provided.

with a plurality of ports 36 in which the reduced end portions of stock to be drawn are receivable. Inwardly from each port 36 are complementary wedge sliding surfaces 31 which are relatively convergent toward the associated port and between which are coacting sliding jaws 38 which cooperate with the surfaces 31 to effect gripping of the stock when the jaws move toward the ports The pairs of jaws are arranged in a row transversely of the housing portion 22. In order to advance the jaws toward the ports 35 to wedging position and retract them therefrom to releasing position, the jaws 3B of each port are connected to a cross bar 39 carried on a rod 40 which is reciprocable toward and awayfromzthe ports. Each arm 40 is connected itoarod .141 car.- ried on one arm .42 .of .a bell crank .43, .to the other arm 44 of which i connected a suitable driving mechanismto be described.

Each rod 40 has its cross bar "39 mounted to engage the upper one of two suitable notches 4-5 in the associated jaws 38, two notches "46 being provided in each jaw so that, in case-of weanthe jaws may be removed and reinserted or use in a position in which they are rotated 180 about their horizontal axes. Thus each rod 40 can be detached from its associated jaws by swinging the rod upwardly aboutt-he rod-4 I.

A lost motion connection is provided between each rod id and the rod 41 to compensate for di fer e n oc iamete and ea jaws 38. In the orm l ustra ed, of the lost motion connectio s com rises a p unger I 1 e p ocalole in the rod ill and u ged t ..e.x e,nd ed p sition by a sp ng .48. The rod 1 operates in an e n ated closed end slot 4 in the rod .49 and en a es t e end of t e pi ton ior apply ng th jaw losi force. .Thesprihe B is uiii ieat ly strong to transmit the normal jaw closing orce with t su s antial omp ession but omp ess s and relieves any e cessive c osing i ree. Thes1ots49 may eslight y .w der th n th -d s eter of the rod 4| to ,compensateior the arcu te movement of the rod 41 o d to holdthe rods imposition aw ththe r ss ars 9seated i the rooves 4.6, .each rod is p ov ded with d pendin arm 50 extendin parallel :to the underside of the rod and between wmch red and the arm an eccentric cam -11 arranged. The cams .45.] are mounted .on a rock shaft :52 which may be rocked inopposito direc tions to seat and hold the bars 39 in the notches 46 or to raise them clear of the notches.

"The bell crank 43 is operated by a piston and cylinder assemblage 53 which is connected to the arm 44 by a linkage mechanism 54. 'The mechanism comprises a cam plate 55 connected "by linksiiii tothe frame of thebench and connected to the piston of the assemblage 53, A roller :5"! is carried on the end of the arm 44 and operates between guideways 58 n the plate .55 and m e y the p a e to t ansmit movement to t e Th c a n is pr fe ab y d v lo a r ver ible mo r, as mentione and the n uallimit switch s are provided for stopping the motor ,andchaingat the end positions o ar iage t avel- SRwosueh limit switches are ororidedone hearieaehendiof the t ack- For xamp e. a i ustrated iniiig- .1.. one of the limit switches 59 is illustrated an secured in fixed relation to the track ,so as to be enga ed by one operat ng a e 0 of s cam for stopp g the m o a t e d o thed auiri operation. The other limit switch is similar to the sw ch 59 and en a ed-by theothcrioperatingjace 62 of thepam plate forzstopping themo tor .a t e end f he carr a e return operation.

.As a safety .:precaution, .means are provided ato hold the h00k;29 clear of the chain atsthe endlof the drawing stroke .of the carriage. This means comprises a platform .6:3 having a ibifurcated end 6:4 connected by a pivot .65 to the trame of the bench and overlying the :track so as to swing downwardly theretowar-d. A spring 66 normally holds the platform in raised position.

Ordinarily, whenthe stock'leaves -the die, the

carriage jumps in the drawing directionand releases the hook 29 from the chain. However, in event of undue length of a piece of stock, there would be no jump .of the carriage and disengagement of the hook 29 and the carriage might run to the end of its track and jam, if the limit switch should fail to function and stop the chain. To eliminate the dangers which would result, the platform is arranged to be engaged at its bifurdated end by'the underside of the leading edge 6 1 of the arm 21 so as to positively lift the arm to di nga ge the hook from the chain.

the eis provided a draw b nch in which the arriage is s .ar ng drelativ t th ha is and chain. and th g i per means ar s positioned r ative to the carr a e that t i nal stresses are reduced to a minimum, are efiicients ly counteracted and at the same time, the space eneat the ri e m ans in o which thedr w stock to be dischar d un st u ted for a material d st ce low the c r ia e for thez uil distance of carriage travel and in all positions of the carriage. Furthermore, the track supports are so arranged that undue'height of the draw, ing level is-eliminated, compactness of the bench is increased, and the track supports themselves are utilized to assist in the removal of the drawn stock.

Other modes of applying the principle of the invention maybe employed, change-being madeas regards the details described, provided the features sta-tedin any of the following claims or the equivalent of such be employed.

"We therefore particularly point out and distinctly claim as our invention:

i. In drawing mechanism including a mono.- rail trackway, an endless driving chain having upper and lower courses supported parallel to and closely adjacent one side of said trackway, and means selectively operable to drive said chain in opposite directions; a draw carriage, a pair of rollers mounted on horizontal axes spaced front to rear in said carriage adapted to rest on and travel alongthe upper surface of said trackway with said'carriage suspended therefrom, whereby saidcarriage is adapted to reciprocate along said trackway, work gripping means on said carriage spaced laterally from said trackway-on the side opposite to said chain, a chain engaging arm connected to said carriage in general alignment, front to rear, with said work gripping means and bridging said trackwa-y re leasablytoengage the upper course of said chain, andwpairs .of rollers mounted on vertical axes :in said carriage disposed and arranged to engage opposite :sides of said :trackway .both :to the front and the rear ,of such .connection with said arm.

.2. In drawing mechanism including a track.- way, anendless driving chain having upper and lower courses supported parallel to and closely adjacent one side of said trackway, and means therewith, chain engaging means connected tosaid carriage on the side of said trackway opposite-to said chain and bridging said'trackway to engage the upper course of said chain, and work gripping means on said carriage to the so. I; same side of said trackway-as such connection.

of: said chain engaging meansa 3. In drawing mechanism including a trackway and a draw carriage mounted for reciprocation therealong; an endless driving chain having upper and lower courses disposed to one side of said trackway and closely parallel thereto, work gripping means on said carriage spaced laterally of said trackway to the side opposite to said chain, chain engaging means connected to said carriage on the same side as said work gripping means, whereby said carriage maybe reciprocated along said trackway upon driving said chain, and guide means on said carriage spaced forwardly and rearwardly of such connection of said chain engaging means adapted to bear against opposite of said trackway to maintain'proper alignment of said carriage.

4. In drawing mechanism including a trackway and a draw carriage reciprocable therealong; anendless driving chain disposed to one side of said trackway and parallel thereto, work grippingmeans on said carriage spaced laterally of said trackway to the side opposite to said chain, and chain engaging means connected to said carriage on the same side as said work gripping means. 7

5. In drawing mechanism including a trackway and a draw carriage mounted for reciprocation therealong; driving means disposed entirely to one side of said trackway adapted to travel parallel thereto, work gripping means on said carriage spaced laterally of said trackway to the side opposite to said driving means, and means connected to said carriage on the same side as said work gripping means adapted to engage said driving means for reciprocation oi said carriage.

6. In drawing mechanism including a trackway and a draw carriage mounted for reciprocation therealong; driving means disposed entirely to one side of said trackway adapted to travel parallel thereto, work gripping means on said carriage spaced laterally of said trackway to the side opposite to said driving means, and means adapted releasably to connect said carriage to said-driving means.

fl. In drawing mechanism including a monorail trackway, standards supporting said trackway, brackets extending laterally from said standards and secured to one side of said track way to carry the same, and a draw carriage suspended from said trackway for reciprocation therealong; an endless driving chain disposed to the standard ide of said trackway and parallel thereto, said chain having an upper course passing above said-brackets and a lower course pass-' ing therebelow,work gripping means 'onsaid carriage to the other side of said trackway from said standards and chain, and means connected to said carriage on the same side as said work gripping means adapted releasably to engage the upper course of said chain for reciprocation of said carriage.

8. In drawing mechanism including a monorail trackway, standards supporting said trackway, brackets extending laterally from said stand-. ards and secured to one side of said trackway to carry the same, and a draw carriage mounted on said trackway for reciprocation therealong; an endless driving chain disposed to thestandard side of said trackway and parallel thereto, work gripping means on said carriage to the other side of said trackway from said standards and g chain, and means releasably connecting said'cai riage and chain.

9. In drawing mechanism including a track-.-

way, an endless driving chain having upper and lower courses supported parallel to and closely adjacent one side of said trackway, and means selectively operable to drive said chain in opposite directions; a draw carriage, rollers mounted on horizontal axes in said carriage adaptedto rest on and travel along the upper surface of said trackway with said carriage suspended therefrom, chain engaging means connected to-said carriage on the side of said trackway opposite to said chain and bridging said trackway to engage the upper course of said chain, work gripping means on said carriage on the same side or said trackway as such connection of said chain said chain selectively in either direction, a draw carriage mounted on said trackway for reciprocation therealong, and a hook pivotally mounted on said carriage adapted to engage said chain thus to move said carriage in one direction during the drawing operation; a cam surface on said hook disposed to ride up on said chain and thereby disengage said hook from said chain when said chain is driven in the other direction, and a spring-supported detent on said hook normally engaging said chain, such spring operating to hold said detent in engagement with said chain for normal return movement of said carriage therewith after completion of the drawing operation but permitting said detent to be forced into retracted position by said moving chain when said carriage is thereupon brought to a stop. I

11. In drawing mechanism including a track way, a driving chain disposed adjacent and parallel to said trackway, means operative to drive said chain selectively in either direction, a draw carriage mounted on said trackway for reciprocation therealong, and a hook pivotally mounted on said carriage adapted to engage said chain thus to move said carriage in one direction dur-' ing the drawing operation; means on said hook resiliently engaging said chain for return of said carriage therewith in the other direction after completion of the drawing operation, said resilient means being adapted to yield and retract from operative engagement with said chain when resistance to further movement of said carriage exceeds a predetermined force.

12. In drawing mechanism including a track way, a driving chain disposed adjacent and parallel to said trackway, means operative to drive said chain selectively in either direction, a draw carriage mounted on said trackway for recipro-' cation therealong, and a hook pivotally mounted on said carriage adapted to engage said chain thus, to move said carriage in one direction during the drawing operation; means on said hook adapted to engage said chain for return movement of said carriage therewith in the other direction after completion of the drawing operation, said means being adapted automatically.

2,654,998 9 to disengage from operative relationship with said chain when resistance to further movement of 10 UNITED STATES PATENTS said carriage exceeds a predetermined force. ag ga P 1,447,895 Schafer Mar. 6, 1923 EDWIN MCILVRIED- 5 1,816,484 Holmes July 28, 1931 NORMAN H. NYE. REFERENCES CITED FOREIGN PATENTS 7 Number Country Date The following references are of record 1n the 547 614 Germany Man 24 1932 file of this patent: 692:034

Germany June 12, 1940

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