US1544594A - Spring die cushion - Google Patents

Description

Jly 7. 1925.

Kjv. NlLsoN ET AL 2 Sheets-Sheet 1 July 7, 192s. Y 1,544,594

l K. V. NILSON- ET AL SPRING DIE CUSHION Filed oct. 15. 192s 4 2 sheets-sheet 2 l ii ,47

.29 25 Kwaad/kwa Patented July 7, 192,5.

UNITED STATES PATENT OFFICE.

KARL V'.I NILSON AND JOHN NELSON, 0F CHICAGO, ILLINO'IS, ASSIGNOR/S TO MAB,-

QUETTE TOOL MANUFACTURING C0., OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

SPRING DIE CUSHION.

'Application filed October 15, 1923. Serial No. 668,506.

'cushion for yieldingly sustaining the draw ring.

-Heretoiore in cushions of this character in which springs are employed for cushi0n-` ing purposes, the pressure or resistance of the spring is generally increased as the Stroke progresses.

,It sometimes happens that it is desired to vary this pressure so as to decrease or increase toward the end of the stroke, and at other times it is desirable that there shall be a substantially unvarying pressure of the cushion throughout the length of the stroke.

With the spring cushions as non' eln- *ployed such a. change is not possible.

It is one of the objects of the present invention to provide improved mechanism of a simple and compact construction which may be readily adjusted in accordance with the requirements of the work and` material being operated upon in the machine.

A further object is to provide an improved cushion ot this character which may be readily installed.

To the attainment of these ends and the accomplishment of other new and useful objects 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 vertical longitudinal sectional view of a portion of a press having a cushion constructed in accordance with the principles of this invention applied thereto, and showing the parts in one position.

Figure 2 is a detail vertical sectional view of the cushion showing the parts inanother position.

Figure 3 is a horizontal sectional view .as taken on line 3-3, Figure 1.

Figure 4 is a detail perspective view of one of the levers, forming a part of the cushion.

Referring more particularly to the drawings the numeral 10 designates generally a bolster' plate of a punch press, having a male die member 11 secured thereto and cooperating with the-male die member 1,1 is

a .female die member 12, the latter being connected to a movable part ofthe pressto be reciprocated in the ordinary and well known manner.

Encompassing the die member 11 is a draw ring 13, Supported by means of the usual pins 14 which engage the bottom of the member 13 and these pins 14 pass loosely through the bolster plate 10 to engage and rest upon a pin plate 15, the draw ring 13 co-operating with the die member 12 to grip the work 16. All of the above referred to parts are of the ordinary and well known construction.

The pin plate 15 is supported by means of a spring cushion, which in the presentform of the invention consists of an anchor bolt j 17, one end of which is detachably secured to the holster plate 10 in any desired or suitable manner, such as by means of a threaded extremity 18 engaging a threaded socket. in4 the bolster plate 10. This anchor bolt. 17 forms' a support for the cushion and may be of any desired lengt-h, the free extremity thereof being threaded to receive a nut or collar 19.l

Loosely encompassing the bolt 17 is a tubular member 20 which is provided with screw threads 21 adjacent its lower extremity. The end of the member 2O rests upon the nut or collar 19 while the end 22 thereof may either terminate short of the pin plate 15 or is adapted to project into a suitable aperture 23 inthe pin plate so as not to interfere with the longitudinal adjustment of the element 2O upon the element 17 This adjustment is accomplished through the me'- dium of the nut. o'r collar 19 being adjusted upon the threaded extremity of the element 17.

A nut or collar 24 is threaded upon the threads 21 on the end ot' the element 20. Encompassing the element 20 is an elastic element 25 preferably in -theform of a coil spring, one end ofwhich spring rests upon the collar 24- and upon the other end of the spring 25 a collar 26 rests, the latter loosely surrounding the element 20.

Interposed between the collar 26 and the pin plate l5 are cam formations preferably in the form of levers, each lever bein provided with arms 27-28, the arms o each lever being .preferably arranged at angles to each other so that the levers of each cooperating pair may be pivotally connected as at' 29. These elements are preferably arranged in pairs and the points of pivotal support of the respective pairs of levers are connected with the tubular element 20 so that when the tubular element 20 is adj usted lengthwise of the element 17 the cam formations will be bodily adjusted therewith.

The extremities of the arms 27 engage the lower face of the pin plate 15 While the extremities of the arms `28 engage the adjacent face of the collar 26. If desired and in order to reduce friction between the contacting points of the arms 27 and the pin plate 15, anti-friction rollers 30 may be provided and similar anti-friction rollers 31 may be connected with the ends of the arms 28 to engage the collar 26.

rlhe arms 27-28 may be of any desired length and the cam elements are adapted to be moved about their pivots 29 so as to vary respectively the oints of contact between the rollers 30 an the pin plate l5 and the rollers 31 and the collar 26.

By varying these points of contact it will be manifest that the leverage of the cam formations upon the collar 26 may be varied by varying the `points lof contact of the respective portions of the cam elements with the elements 15 Aand 26. This variation in leverage which occurs by the adjustment of the cam elements will control the action of the .spring 25.

In Figure 1 the cam. formations are so positioned with respect to the pin plate 15 and collar 26 that upon-the operation or depression of the draw ring 13 under the influence of the die member 12, the spring or elastic element 25 will be compressed in such a manner that as'tlie draw ring is depressed the pressure on the spring 25 will increase,

as the spring islcompressed, toward the end` parts assume the position as shown in Fig- Iure 2. n this -position of the parts and when the pin plate 15 is depressed the spring 25 will also be compressed but in such a manner that the pressure on the spring or elastic element will decrease toward the end of the stroke.

Obviously when it is desired that there shall be a substantially unvarying pressure of the spring 25 throughout the limit of the stroke, the cam formations may be adjusted so as to position theA ends thereof respectively with relation to the pin plate 15 and the collar 26, to accomplish this result.

Vhile the cam formations have been herein shown and described as consisting of a substantially bell crank lever formation it is to be understood that they may be of any desired 'configuration suitable for the purpose. It will also be understood that whereas the elastic element 25 has been herein .shown and described as a spr-ing, the same the collar 26, the nut or collar 24 should be adjusted upon the element 20. During the adjustment of the' nut or collar 19 on the element 17 to bodily raise or lower the cam formations, it' is manifest that the elastic element will exert its stress upon the cam formations through the medium of the collar 26 and this will cause the cam formations to assume the proper positions or .fol

low during theadjustment of the element Obviously the end of the element 20 adjacent the pivot 29 of the cani formations is so shaped or constructed that the end of the element 20 will not interfere with the movement of the cam elements about the pivot 29.

The term lever will be employed through the claims to designate the cam formation but it is to be understood that this is not to be considered as a term of limitation as a lever or any cam formation suitable for the purpose may be employed.4

Obviously, many changes in the details of constructionv and in the combination and arrangement of the several 4parts may be made, withiny the scope of the claims, with- -out departing from the spirit of this invention.

l/Vhat is claimed as new is A 1. A -sprin die cushion embodying a movable mem er, a spring resisting movement of saidl member, levers pivotally mounted intermediate their ends and disposed between the said spring and movable member and operating upon both, the movelon ment of the said member in one direction operating to move the levers about their pivots and against the stress of the spring, means for adjusting the normal relative position of the levers with respect to each other lto vary the normal relative position ot' the said member and spring, and means or bodily adjusting the levers. y 2. A spring die cushion embodying a movable member, levers pivotally mountrd'intermediate their ends, a movable element spaced from the said member, an adjustable support, levers pivotally mounted intermediate their ends upon the support and disposed between the said movable member and element, elastic means for opposing the movement ot' the said levers about their pivots, and means for adjusting the said support for varying the normal position of the said pivot of the levers with relation to the said movable member.

' 3. A spring die cushion embodying spaced movable members, levers pivotally mounted intermediate their ends, the respective ends of the levers having engagement with both the said members, lone of the members tending to move the levers about their pivots to move the other of said members, an velastic element resisting the last said movement of the -said levers about their pivots, and means for varying the respective points of contact of the ends of the said levers with the said members. l

'4. A spring die cushion embodying spaced movable members, levers pivotally mounted intermediate their ends, the respective ends of the levers having engagement with both the said members, one of the members tending to move the levers about their pivots to move the other of said members, an elastic element resisting the last said movement of the said levers about their pivots, and means for shifting at W1ll the position of the pivots of the levers With relation to one of the said members. v

5. A spring die cushion embodying spaced movable members, levers pivotally mounted intermediate their ends, the respective ends of the levers having engagement with both the said members, one of the members tending to move the levers about their pivots to move the other oit said members, an elastic element resisting the last said movement of.

the said members, one of the memberstend-- ing to move the levers about their pivots to move the other of said members, an elastic element reslstmg the last said movement of the said levers about their pivots, means for varying the respective points ot' contact ci' the ends of the said levers with the said members, and means for varying at will tht` normal tension ot' the said elastic element.

7. A spring die cushion embodying a movable member,l a stationary clement', a support adjustably mounted upon the said clement, a collar sleeved upon the support, au elastic element resisting the movement ot' the-collar in one direction upon the support, levers pivoted intermediate their ends upon the support, said levers being disposed between' the said movable memberand the said element, the respective ends of the levers having engagement with the said movable member andfelement,the action of the said movable member upon the levers tending to move the levers about their pivots to move the said collar against the stress of the said elastic element, and means for varying at will the normal tension of thesaid elastic element.

8. A spring' die cushion embodying a movable member, a stationary element, a support adjustably mounted upon the said element, a collar sleeved upon the support, an elastic element resisting the movement of the collar in one direction upon the support, levers pivoted intermediate their ends upon the support, said levers being disposed between the said movable member and the said. element, the respective ends of the levers. having engagement With the said movable member and element, the action of the said movable member upon the levers tending to move the levers about their pivots to move the said collar against the stress of the said elastic element, and means for adjusting the said support at will to vary they position of the pivot oit' the said levers with relation to the said movable member.

9. A spring die cushion embodying a movable member, a stationary element, a support adjustably mounted upon the said element, a collar sleeved upon the support, an elastic element resisting the movement of the collar in one direction upon the support, levers pivoted intermediate their ends upon the support, said levers being disposed between the said movable member and the said element, the respective ends ot the levers having engagement With the said movable member and element, the action of the said movable member upon the levers tending to move the levers about their pivots to move the said collar against the stress of the said 'ing at Will the normal tension of the said elasticelement.

l0. A spring die cushion embodying a tubular member, an anchor bolt upon which the member is sleeved, a collar adjustably connected with the bolt and operable to move the tubular member longitudinally of the bolt, a second collar loosely sleeved upon the said member, 'a collar adjustably connected to the tubular member, an elastic element encompassing the said membeil With its ends in operative engagement with the last two recited collars, a movable member spaced above the first recited collar, and levers pivotally mounted intermediate their said second collar and the said movable 15 member.

In testimony whereof We have signed our names to this specification, on this 10th day of October, A. D. 1923.

KARL V. NILSON. JOHN NELSON.

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