US1910523A - Metal working press - Google Patents

Description

3 May 23, 1933. v CRANE 1,910,523

METAL WORKING PRESS Filed Oct. 10, 1931 5 Sheets-Sheet 1 y 1933. E. v. CRANE 1,910,523

METAL WORKING PRES S y 1933- E. v: CRANE 1,910,523

METAL WORKING PRES 5 Filed Oct. 10, 1951 5 Sheets-Sheet s May 23, 1933. E, v. CRANE 1,910,523

' METAL WORKING PRESS Filed Oct. 10, 1951 5 Sheets-Sheet 4 May 23, 1933. E v CRANE 1,910,523

METAL WORKING PRESS Filed Oct. 10, 1931 5 Sheets$heet 5 Patented May 23, 1933 UNETED t'tTATES PATENT ()FFICE EDWARD V. CRANE, OF BROOKLYN, NEW YORK, ASSIGNOR TO MARQUETTE TOOL 8t; MFG. COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS METAL WORKING PRESS Application filed October 10, 1931.

This invention relates in general to metal working presses, but more specifically though not necessarily limited, to the use of drawing shlfet metal shells, vessels, receptacles and the li e.

It is well known that in presses of this character the limit of the drawing action or depth of the draw is determined by the actual travel of the slide of the press.

It is one of the objects of the present invention to provide in a press of this charac ter means whereby shells, vessels, receptacles and the like may be drawn deeper than onehalf of the stroke of the press, which is now the drawing limit of an ordinary press.

A further object is to provide. in a single action press improved means for increasing the depth of the draw beyond the actual travel of the slide of the press, and which means is arranged above the bed of the press, and at the same time provide means whereby the pressure required to maintain the blank against wrinkling will always be in proper proportion or ratio to the drawing pressure required by the material being acted upon.

To the attainment of these ends and the accomplishment of other new and useful ob jects as will appear, the invention consists in the features of novelty in substantially the construction, combination and arrangement of the several parts hereinafter more fully described and claimed and shown in the accompanying drawings illustrating this invention and in which Figure 1 is a view partly in elevation and partly in vertical section, parts being omitted, of a press of this character constructed in accordance with the principles of this invention, and showing the position the parts will assume. when the slide or ram is at the limit of its upward movement.

Figure 2 is a view similar to Figure 1, on an enlarged scale, showing the position the parts will assume during a portion, of the stroke of the press.

Figure 3 is a view similar to Figure 2 showing the position the parts will assume at the limit of the downward movement of the slide of the press.

Serial No. 568,135.

Extending above the bed of the press are uprights 14 and journaled in suitable bearings and extending across the space between the uprights is a shaft 15 to which is connected a crank 16. Movable between the up rights 14 and in a manner to be guided thereby is a reciprocable member or slide 17 which is connected tothe crank 16 by means of a suitable link or coupling 18 through the medium of a pivot pin 19. The shaft is rotated in any suitable manner (not shown) so as to cause a reciprocation of the slide 17.

Carried by the slide 17 are fulcrums 20, any number of which may be provided, but four are usually employed, one adjacent each corner of the slide. Pivotally mounted intermediate its ends and to each of the fulcrums 20 as at 21, is a lever 22, and adjustably secured to the outer end of each of the levers 22 by means of adjustable fastening devices 23 is a bearing 24, to which one end of a link 25 is pivotally connected as at 26, the bearing 24 being adjustable toward and away from the pivot 21 to vary or adjust the throw or rocking movement of the lever 22 as may be desired. The other end of each of the links 25 is pivotally connected as at 27 to a slide 28, which moves in suitable guides between the uprights 14 and secured to the slide 28 is a work holder 29, which, when the slide 28 is at the limit of its lowermost movement, will c0-0perate with the die 11 to clamp the work 30 therebetween and serve to hold the work with the desired pressure to permit the formation of the work and prevent wrinkling of the same.

The slide 28 is supported by the slide 17 through the medium of the fulcrums 20', pivot 21, levers 22 and links 25, so that when the slide 17 is reciprocated toward and away from the work during predetermined portions of the cycle of operation of the press the slide 28 will be correspondingly moved. However, the slide 28 is preferably spaced a short distance below the slide 17, and resiliently yielding members 31 preferably in the form of coiled springs, any number of which may be provided, are disposed between the slides 17 and 28, and tend normally to separate them, for a purpose and in a manner to be set forth.

The slide 28 is hollow and reciprocable therein is a member 32 to which one end of links 33 are pivotally connected as at 34 and the other end of the links are pivotally connected as at 35 to the respective levers 22 on the sides of the pivots 21 opposite to the side on which the bearing member 2 1 and the ends of the link 25 are connected.

With this construction it will be manifest that assuming the parts to be in the position shown in Figure 1 when the slides 17 and 28 are lowered they will move in unison and the levers 22 and links 25 and 33 will move therewith, the resilient members 31 tending to separate the slides 28 and 17 to maintain the parts in the relative positions shown in Figure 1. When, however, the slide 28 has moved to the position shown in Figure 2, that is so that the work holder 29 will 00- operate with the die 11 to clamp the work 30, the movement of the slide 28 will be arrested. This occurs before the limit of the downward throw of the press is reached. The slide 28 being thus arrested in its downward movement, the crank 16 will continue to rotate and will further move the slide 17 in the same direction, with the result that the resilient members 31 will be compressed so as to allow the slide 17 to move toward the slide 28. This relative movement of the slide 17 with respect to the slide 28 will lower the fulcrums 20 and consequently the levers 22, and as the slide 28 will then be held stationary such lowering movement of the slide 17 will cause the levers to rock about the pivots 21 by reason of the fact that the point of pivotal support or fulcrum will at this time be shifted from the pivots 21 to the pivots 26. This rocking movement of the levers 22 will move the member 32 which constitutes the ram downwardly with respect to the slide 28, causing a punch 36 which is carried by the member or ram 32, to force the material 30 into the die 11, as shown in Figure 3 of the drawings, thereby shaping the work.

At the time that the slide 17 starts to ascend, the slide 28 will be momentarily restrained from directly following the slide 17 by reason of the expansion of the resilient members 31, such relative movement being sufiicient to permit the punch or die 36 to be partially stripped of the finished work.

As the slide 17 continues to ascend and as the resilient members 31 expand to cause a relative movement between the slides 17 and 28 the fulcrums 20 will be raised with respect to the slides 28 and the pivot of the levers 22 will be again shifted from the pivot 26 back to the pivot 21, causing the levers 22 to rock in the opposite direction about the pivots 21 and thereby move the member or ram 32 from the position shown in Figure 2, back to the position shown in Figure 1, with respect to the work holder 29 and the slide 28.

It will therefore be manifest that with this improved construction it will be possible to provide in a single acting press a means to increase the stroke of the press beyond that of the normal crank throw, result ing in an increased depth of draw upon the work.

Obviously the depth of the draw may be controlled by adjusting the bearing members 24 towards or away from the pivot 21 to vary or alter the throw of the levers 22.

' As a means for maintaining the slide 17 and the ram or member 32 in alinement and to prevent lateral displacement one withrespect to the other, there may be provided a projection 37 carried by one of the slides, preferably the slide 17, which is adapted'to enter a recess or opening 38 in the proximate face of the member or ram 32.

If desired, the member or ram 32 may be provided with projecting ribs 39 adapted to move in guideways 40 in the slide 28.

It will also be manifest that with this invention the use of cumbersome toggles used in connection with toggle presses may be dispensed with and the construction of the press greatly simplified, with the result that the same results and purposes which have here tofore been produced upon a double action press may be accomplished in a single action press. The pressure necessary to main tain the blank from wrinkling is derived though a system of levers and links and the correct pressure can be determined through this arrangement and will always be in proportion to the drawing pressure required by the material.

This is accomplished because when the work holder 29 carried by the slide 28 abuts the work 30, the movement of the slide will be arrested. During this lowering of the slide 28 the slide 17 and fulcrums 20 with levers 22 are being pulled down or bodily lowered by the pivots 21, but when the slide 28 is arrested the member 32 continues to move downwardly causing a shifting of the fulcrum of the lever 22 from the pivot 21 to the pivot 26.

Furthermore, all of the parts of this mechanism are arranged above the bed of the ress.

While the preferred form of the invention has been herein shown and described, it is to be understood that various changes may be made in the details of construction and in the combination and arrangement of the several parts, within the scope of the claims, without departing from the spirit of this invention.

iVhat is claimed as new is 1. In a metal working press, a reciprocable member, a crank operating to impart a fixed throw to said member, a die movable with and with respect to said member, means operating automatically at a predetermined time in the cycle of operation of the press for moving the said die with respect to the said member, beyond the normal crank throw of said member, the said means embodying a work holder movable with and with respect to said member, and lever and link connections between said work holder, member and said die.

2. In a metal working press, a reciprocable member, a crank operating to impart a fixed throw to said member, a die movable with and with respect to said member, means operating automatically at a predetermined time in the cycle of operation of the press for moving the said die with respect to the said member, beyond the normal crank throw of said member, the said means embodying a work holder movable with and with respect to the said member, resiliently yielding means disposed between said work holder and member and tending normally to separate them, and lever and link connections between said work holder, said member and said die.

3. In a metal working press, a reciprocable member, a crank operating to impart a fixed throw to said member, a die movable with and with respect to said member, means operating automatically at a predetermined time in the cycle of operation of the press for moving the said die with respect to the said member, beyond the normal crank throw of said member, the said means embodying a work holder movable with and with respect to the said member, resiliently yielding means disposed between said work holder and mem her and tending normally to separate them, and lever and link connections between said work holder, said member and said die, said work hold-er also operating at a predetermined time in the cycle of operation of the press as a stripper for the work from said die.

4. In a metal working press, a ram, a die carried therewith and movable with respect thereto, said ram having a fixed throw, means embodying lever and link connections between said ram and said die and rendered active at a predetermined time in the cycle of operation of the ram for moving the die beyond the normal throw of the ram, and

means whereby the extent of the last said movement of the die may be varied.

5. In a metal working press, a ram, a die movable therewith and with respect thereto, a work holder also associated with the ram, a fixed element with which the work holder co-operates, and means whereby contact of said work holder with said element will move said die beyond the limit of the stroke of the die with the ram and towards the said element, the said means embodying lever and link connections between the ram and die.

6. In a metal working press, a slide, reciprocable with a set throw, a second slide disposed therebelow, resiliently yielding means disposed between the slides and tending normally to separate them, a lever fulcrumed intermediate the ends upon the first said slide, a link connection between one end of the lever and the said second slide, a movable die, a link connection between the said movable die and the other end of the lever, and a fixed element against which said second slide is adapted to abut at a predetermined time in the cycle of reciprocation of the press, whereby the movement of the said second slide will be arrested and the first said slide will continue its movement to rock said lever to move said die towards the said fixed element.

7. In a metal working press, a slide, reciprocable with a set throw, a second slide disposed therebelow, resiliently yielding means disposed between the slides and tending normally to separate them, a lever fulcrumed intermediate the ends upon the first said slide, a link connection between one end of the lever and the said second slide, a movable die, a link connection between the said movable die and the other end of the lever, a fixed element against which said second slide is adapted to abut at a predetermined time in the cycle of reciprocation of the press, whereby the movement of the said second slide will be arrested and the first said slide will continue its movement to rock said lever to move said die towards the said fixed element, and means whereby the extent of rocking movement of the lever may be varied.

8. In a metal working press, a fixed die, a work holder co-operating with said fixed die, a shaping member, means for actuating the said member to operate upon the work, and means whereby the pressure exerted by said shaping member upon the work to shape it, will automatically control the degree of pressure between the work holder and the work, the last said means embodying a series of levers and link connections between the shaping member and the work holder.

9. In a metal working press, a slide reciprocable with a set throw, a second slide spaced therefrom, resiliently yielding means disposed between the slides and tending normally to separate them, a lever fulcrumed intermediate it's en'ds upon one of the slides, a link adjustably connected by one end to one end of the lever and connected by its other end to the other slide, a movable die, a link connection between the said movable die and the other end of the lever, and a fixed element against Which said second slide is adapted to abut at a predetermined time in the cycle of reciprocation of the press, whereby the movement of the last said slide Will be arrested and the first said slide Will continue its movement to rock said lever to move said die to- Ward the said fixed element.

In testimony whereof I have signed my name to this specification, on this 25th day of September, A. D. 1931.

EDWVARD V. CRANE.

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