US1496137A - Drawbench apparatus - Google Patents

Description

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A. SUNDH DRAWBENCH APPARATUS 3 Sheets-Sheet 1 Filed Sept. 22. 1921 awoaw o c- I LM 3331 h whom Lug mama? A. SUNDH DRAWBENCH APPARATUS Filed Sept. 22, 1921 3 Sheets-Sheet 2 3 373$ 51 V I 36, 3 43M 51 AUGUST SUNDH, or HASTINGS-UPON-HUDSON, NEW YORK, ASSIGNOR T0 SUNDH EN- GINEERING AND MACHINE COMPANY, OF PHILADELPHIA,

CORPORATION OF PENNSYLVANIA.

P NNSYLVANIA, A

DRAWBENCI-I APPARATUS.

Application filed September 22, 1921. Serial No. Q2-,559.

T 0 all whom it may concern: 1

Be it known that I, AUGUST SUNDH, a citi- Zen of the United States, residing in Hastings-upon-Hudson, in the county 'of est,-

chester and State of New York, have invent-,

ed a new and useful Improvement in Drawbench Apparatus, of which the following is a specification.

My invention relates to improvements 1n drawing apparatus and more. especially to apparatus for drawing tubes through a die or the like, to suitthe gage and shape of the material to be drawn;

Among the objects of my invention is. to I provide means to cushion the drawing mechanism against the. tube drawing die, means to permit lost motion in the drawing mechanism, and power means to close the jaws of the tube drawing tongs on the tube.

lVith the above objects in View, the invention consists in the apparatus hereinafter described and illustrated in the accompanying drawings, in which:

Figure 1 is a fragmentary plan view of a suitable bench with my invention applied thereto.

Figure 2 is a longitudinal vertical view of a drawing mechanism for a draw bench, embodying the principles of the present invention. 7 I

Figure 3 is a top or plan viewof the same.

Figure l illustrates a top or plan view of a part of the drawing mechanism.

Figure 5 is a longitudinal vertical view showing a section of another part of the drawing mechanism.

Figure ('3 is an end view of the drawing mechanism, illustrating some of the novel features of the same.

Figure 7 is a sectional end view of a draw bench embodying Figure 6, in a. simplified form, illustrating its position on the draw of the device in their operative relation to each other.

Figure 1.1 is a fragmentary perspective view of the toggle joint.

Similar characters of. reference are em ployed in the above described views to indi- .cate corresponding parts.

My invention, as heretofore stated, ap-

, plies to improvements in drawing apparatus n general, but moreespecially to apparatus for manufacturing tubing, andas it can be as well illustrated in connection, with the latter, I will so describe it.

Referrin to Figure 1,therein is illustrat ed, as suita Is for my'purpose, a fragmentary View of a draw bench, 1 comprising a structure built up of longitudinal frame ba rs,2 and 3, to form a track and guide for the travelling draw mechanism, 4. The bars, 2 and 3, being secured at their front ends to one Side of an abutment, 5, and their rear ends to standards, 6 and 7 the latter being fastened to a bed plate, 8, which supports a drum, 9, and' a motor, 10. Secured to the other side of the abutment,-5, is a tank, 11, to contain a liquid into which the tubes are dipped before being drawn. Recessed into the abutment, 5, is a die, 12, held in a vertical position, through which a tube, 13, is

, adapted to'be drawn over. a mandrel. 14,

Closing of the button operates the toggle joint, by means ofcurrentobtained from a source of supply through the wires, 20 and 21. Various mechanism may be employed to propel the drawing mechanism upon the tracks of the draw bench, 1. For illustrating my invention, I preferto use cables or other flexible connections, 22 and 23. The cables, which are the d 'a-wing or pulling means are secured atone of their ends to the draw mechanism, 4, at 24, their other ends being secured to the drum, 9. upon which they are wound. The cables, 23, which are th returning means, that is the means for see Figure 2.

returning the draw mechanism to the die after the completion of the draw, are also secured to the draw mcchanism'at one of their ends at 25; for illustration of same, The cables then continue throughgrooves, 26, Figure 8, in the inner sides of the longitudinal frame bars, 2 and 3, over pulleys, 27, not seen in Figure 1, as thcy are shown incased in covers, 28, a part of one of the said pulleys however being seen in Figure 8, a part of which pulley extends from within the cover, underneath the tank,

convenientmechanism, as for instance, from the electric motor, 10, through gearing, 29.

Means for operating, and power for the.

motor. 10, being bad by the switch, A, and

from the plus and minus mains.

Referring to'Figures 2 and 3, therein are shown assembly views of the drawing mech-"Q anism, 4. which comprises supports,,30, 31 and their-ends adapted to have sliding contact on the frame bars, 2 and 3, ofthe draw bench, 1. The support, 32, is a crosspiece,

and like the other supports, it-bridges the frame bars. 2 and 3, and has slidingcontact" thereon. The support, 30, carries theft'o-ngs,

I 17. they being centrally pinned to the supa slot, -10. in the rod.

port by a pin, 33, and adapted to rest on-"a boss, 34, on the support. and which-boss is:

shown in Figure 4. To the tongs pinned connection, 35, by means of pins, 36, the

other ends of the connections being pinned by a pin, 37, to a link. 38, in the support, 31. A rod, 39, see Figure l, is fastened to the support,30. by the pin, 33; it extends underneath the tongs and is engaged at its other end by the pin. 37, of the link, 38, engaging The purpose of the rod will be explained later. The link. 38, is held in the support. 31. by means of a slot. 41, see Figure 5, formed for its reception. There is also a crosspiece. -12. fastened to the link to hold the link in its slot in the .support. 31. The support. 31. also supports at its end opposite to the end which holds the link. a draw rod, 43, which draw rod is encompassed by a spring, 44. The support. 31. is cored out as seen in the Figure 5 for the reception of the draw rod, 4.3, and a nut, 4-5. fastened to the end of the draw r'od. cored hole, to, in the support. -31. through the part of the slot, 41. in the support. 31, indicated by 47, after which it is scrcwcd to the pin, through an opening, 48, above the The supports, 30 and 31, have tween them.

The nut. in. is placed in the cored hole by a tool, engaging the holes in the nut. The support, ,32, supports the other end of the draw rod, 43, together with other parts not spoken of heretofore of the drawing mechanism, and which are a crosspiece, 49, and an equalizing cable hitch bar,

50. The crosspiece is connected to the support, 32, through the intermediat'ion of connections, 51, which are fastened at one of equalizing cable hitch bar, 50, is fastened the ends, 25. of the cables, 23, the cable hitch bar being placed in-the fork, 52, of the draw rod, 43, and held therein by a'bolt, 53, which .bolt also is the fastening means of the draw rod, 43, to the support, 32.

5-1 indicates a spacer or bushing between the draw rod, 43, and support, 32. Also placed in the fork of the draw rod, 43, and held thereto by a pin,

55, is an equalizing cable hitch. 56, and to whichis fastened by pins. 57, cable cups, 58, in which are fastened the ends, 24, of the cables, 22.

' Beferring particularly to Figures 9, 10

and 11, therein are shown views of the toggle join t,,16, for operating the tongs of the drawinginechanism, consisting of bell crank levers, 59 and 60. Arms, 61 and 62, of the levers/are somewhat T-shaped. their pivotal points, 63 and 64, respectively,being loosely journalled to the bench side of the abutment, 5, shown in Figure 9.

To the uppermost end of each arm, (31 and 62, are loosely journalled bars, and 66. respectively. adapted to be moved toward each other, closing the tongs. 17. of the drawing mechanism when the same are be- The hatched squares. 67 and 68, in Figure 10 either side of the bars 65 and 66 represent a guide for the bars, which in the case of the draw bench shown in Figure 1, are in the form of slots cutin the abutment, 5, as shown in Figure 9. The other arms, 69 and 70. of the lcvers are looselypivoted at one of their ends to the lower ends of the T-shaped arms. (31 and 62. of the lever at T1 and 72. respectively. their other ends being pivoted together at Tflto an end of a link. 74. the other end of the link being pivoted between rods. and T6. of a lever, 77, which is pivoted at one of its ends to a bracket, 78, secured to a leg on the opposite side of the bench, opposite the leg. 79. shown in Figure 9.

Between and secured thereto, to the other ends'ot' the rods, 75 and T6. of thc lcvcr, T7. is a bar, 80, which is also loosely jouruallcd in the fork of a bar, 81, the said bar being secured between the fork formed in the plunger, 82, of an electro-magnet, 83. The coil, 84, and frame, 85, for the coil of the electro-magnet is mounted upon a. base, 86, supported by a bracket, 87, .afiixed to the leg, 79, as illustrated in liigures 8 and 9. An angle iron, 88, secured to the abutment, 5, and to the frame, 85, of the magnet, is used also as a support therefor. The action of the toggle insures that the} tongs will securely grip the tube to the end that the tongs will not slip on the tube in the beginning of the operation of drawing a tube.

T he operation of the draw mechanism and toggle joint will be clearly evident from the above description, and from an inspection of the accompanying drawings.

The operation of the abovementioned devices is bllBfl as follows: The tube to be drawn over a mandrel and through a die is caused to assume the position indicated in Figure 1., of the drawings the pointed or end portion, 18, of the tube, projecting through the die, 12, into the opened tongs of the drawing mechanlsm, which 1S caused to assume this open POSltlOll. The button, 19,

' in Figure 1. is pressed, completing a circuit from the plus main wire, 20, through the coil, 8i, of the electro-magnet of 'the toggle joint, button 19, wire 20, to the minus main. The coil is then energized, drawing its plunger, 82, into itself, the toggle fjoint assuming a position as in l igurelththe bars, and 66, of the toggle joint, will have moved the tongs of the drawing mechanism to cause it to be closed upon the end portion of the tube to be drawn, after which the button, 19, is released. and the bars. allowed to be come free of the grip. The drawing mechanism is then started to travel by means of the motor, 10, causing the drawing mecha nism to be pulled along the track formed by the frame bars. 2 ,and3, towards the rear end of the draw bench. drawing the tube, 13, over a mandrel. ll. andthrough the die, 12. It can readily be seen;that,=ias a result of the initial grip of the tongsnpon the end of the tube. by the action of the toggle, and by the design of the clamping tongs. the harder the pull required todraw the tube, the greater will be the gripping actiouof the tongs upon the tube. The-initial grip of the tongs upon the tube. caused by the toggle joint. insures a positive grip upon the tube in the beginning of the drawing operation. 4 I

Upon completion of the 'draw the tongs releases its hold upon the tube. as there is no resistance to ovcrcmne. namely the resistance ot the die. as the tube has been cntirely pulled through it, the tube falling out of the tongs ol the grip due to its own weight. and in the case of the draw bench in mind, the tube fall into a container lorated underneath the bench, thus eliminatmg any manual means for removing the tube from the bench. The drawing mechanism is then caused to travel back to the front end of the bench through a reversal of the motor, 10. by means of switch, A. At the start of the return operation, the tongs automatically open,'the resistance offered by the joint connection formed by the connections, 35, between the gripand the support, 31, being less than the resistance to be overcome in causing the support, 30, which carries the tongs to be moved. Accordingly the pin, 37, in the link, 38, in the support, 31, will travel in the slot. 4:0, n the rod, 39, underneath the tongs, until it assumes aposition as shown in the Fig ure 4, which shows a cross-section of the pin. The support, 30, will then be caused to travel with its opened tongs, being-virtually pushed by the other supports. 31- and 32, behind it. As will be seen from the aforegoing explanation the tongs are al ways open in the return operation, consequently, being in that position at arriving at the front end of the bench to, be in a position to engage another tube to be drawn as before. V

Should the operator fail to stop the drawing mechanism in time or should the automatic means used on some draw benches fail to render the power mechanism,inoperative, the drawing mechanism,-l, will abut against the die, 12, with undue shock to the bench, and in the instance where cables. or other flexible means are used as a return means. the said means may be broken as a consequence. This however is eliminated by the buffer effect embodied in the drawing mechanism, whereas when the drawing mechanism abuts against the die the support, 32, to which the return cables, 23, are fastened, will still be allowed to move through the movement imparted to the draw rod, 43, affixed to it. the draw rod and nut. 45, affixed to it, being projected into the hole. -16. in the support, 31. compressing the spring -l-l. The tongs, 17. ot the drawing mechanism, 4., are always in an open position when returned to the die, 12. for reasons before stated. and that when the drawing mechanism abuts against the die, that the motion of all its parts are not stopped, by the effect,

but that through the further motion of other 7 parts, by the driving motor, 10, through the intermediation of return cables, 23, the draw rod, 43. and nut, 45. are projected against the spring, 44. into the hole. 4-6. of the member. 31, until the driving motor, 10, is stopped, all of which has been stated before. As a consequence the motor for operating the draw bcnch mechanism will be allowed to start under no load. before it commences actually to draw a tube. the motor. 10, in starting pulling the draw rod, 43, and nut,

. could be inc 45, from its projected position through the intermediationof the pulling cables, 22, at

the end of which it will commence actually to draw the tube. The ,above described loose connection between the pulling cables 22 and drawing tongs, broatlly stated, at the beginning of the movement of the cables in the operation .ot pulling the tongs to draw a tube, may bercferred to as a lost motion de- "ased, lengthening the cor hole,ff,.-t(l, t he stroke of, the draw rod, 43, would tlinb'egreater, the length of the draw rod, and also. the spring, 44, to be increased if necessary.

I'Iavingthus described my iiwention, I

. claim as new. and desire to secure byLetters Patent ofth'ellnited States:

1. 'In"anapparatus for drawing metal tubes having a stationary tube drawing die and 'traveling tube drawing mechanism, adapted to travel from and to the die, a spring adapted to cushion the.v drawing mechanism againstthe die in its return travel thereto.

In ail apparatus for drawing metal tubes having a stationary tube drawingdie and traveling tube drawing mechanism, adapted to travel from and return to the die.a rod in said drawing mechanism and a spring on said rod to cushion the drawing mechanism against. the die upon its return thereto.

3, In a drawing mechanism for drawing ,metaltubes. the combination of a stationary tube drawing die, tongs to grip the tube to draw it. through the die. actuating means to move the. tongs to draw the tube through the die and a lost motion device between the tongs and actuating means.

l. An apparatus for drawing metal tubes consisting of the combination of a stationary tube drawing die, a pair of traveling tongs tor drawing the tube through the die adapted to travel from the die in drawing a tube, an electric motor for moving the tongs from the die to draw a tube, and connections including a lost motion device between the motor and tongs, whereby the motor can be started from rest to be brought up to a desired speed before it moves the tongs to draw atube.

5. In an apparatus for drawing metal tubes, the combination of a stationary tube drawing die, a pair of traveling tongs to grip the tube to be drawn and travel from the die in drawing a tube through it, a.

traveling support for the tongs and to which they are fastened, a draw rod, one end adapted to engage the support and be partially drawn through it, means fastened to the other end of the rod for moving it, whereby the rod is allowed to move a distance in said support before it begins to move the support and the tongs to draw the die. 7

6. In an apparatus for drawing metal tubes, the combination of astationary tube drawing die, a pair of traveling tongs adapted to grip the tube to be drawn through the die and travel from the die in drawing the the tube through tube through it, a traveling support for the tongs and to which they are fastened, a draw rod, one. end sleeved into and adapted to be partially drawn through and engage the support, means fastened to the other end of the rod for moving it and a coiled spring on the rod for cushioning the tongs against the die in their return travel to the die.

7. In an apparatus for drawing metal tubes, the combination of a pair of tongs for gripping the tube to be drawn, bell crank levers to close the tongs, a toggle joint device between the bell crank levers, another lever conn'ectedfto the toggle joint device, and electric means to actuate said last mentioned lever to actuate the toggle joint device and the bell crank levers to close the tongs on the tube.

In testimony whereof, name to this specification.

AUGUST SUNDH.

I have signed my

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