US1550580A

US1550580A - Blank-holding means

Info

Publication number: US1550580A
Application number: US754349A
Authority: US
Inventors: Raymond E Servis; Fredrich J Rode
Original assignee: Marquette Tool & Manufacturing Co
Current assignee: Marquette Tool & Manufacturing Co
Priority date: 1924-12-06
Filing date: 1924-12-06
Publication date: 1925-08-18
Anticipated expiration: 1942-08-18

Description

3 Sheets-Sheet 2 Filed Dec. 6; 1924 R. E. SERVIS ET AL BLANK HOLDING MEANS Aug 18, 1925 redaoowfoade,

Aug. 18, 1925.

Filed Dec. 6, 1924 R. E. SERVIS ET AL BLANK HOLDING'MEANS 3 Sheets-Sheet 5 Even/Mfg flaa chlliocte an I .Y

Patented Aug. 18, 1925.

UNITED STATES PATENT OFFICE.

RAYMOND E. SERVIS AND FRIEDRICH J. RODE, OF CHICAGO, ILLINOIS, ASSIGNORS TO MABQUETTE TOOL & MFG. COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

BLANK-HOLDING MEANS.

Application filed December 6, 1924. Serial No. 754,349.

To all whom it may concern:

Be it known that we, RAYMOND E. SERVIS and FREDRICH J. Roma, citizens of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Blank-Holding Means, of which the following is a specification.

This invention relates to spring pressure cushions for use in drawing in one operation, metal shapes or shells of a greater depth than is ordinarily possible to draw in one operation, and is particularly adapted though not necessarily limited in its use in connection with what is termed a single action mechanical press.

In presses of this character there is provided a plurality of draw rings or blank holding means which co-operate with the die, the blank being held between the draw ring or blank holding means and the ram during the forming or the shaping of the article. These draw rings are usually arranged one within the other, one of the rings being held by spring pressure, against operation while the other ring is moved during the first portion of the cycle of operation of forming or shaping the blank over the stationary die and over the other die ring.

After the completion of the first portion of th cycle of operation in forming or shaping tie article and during the same strokeof the ram, the article is further shaped over the stationary die, the inner draw ring being then moved against the spring pressure acting thereupon.

The fluid pressure upon the inner draw ring must of necessity be of such a degree that the ring will not be moyedduring the first portion of the formation of the article, with the result that during that portion of the cycle of operation of the press in which the inner draw ring is moved, the ram must overcome the excess spring pressure to complete the formation or shaping of the article. This results in a strain upon the crank shaft and clutches and reduces the capacity orscope of the press.

It is one of the objects of the present invention to overcome these ditliculties and objections and to provide improved means to positively lock in a fixed position one of the blank holding members or draw rings while i the other member or'blank holding means is allowed to remain movable under the action of the ram, and to provide improved means for unlocking or releasing the locked member to allow it to move at a predetermined point or time in the cycle of operation of the press.

A further object is to provide improved means operating automatically to lock one of the blank holding means against move ment and to automatically unlock or release the blank holding means for movement.

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 sec- Figure 3 is a detail view, partly in section and partly in elevation taken on line 3-3, Figures 1 and 3.

Figure 4 is a detail horizontal sectional view taken on line 44, Figure 1.

Referring more particularly to the drawings the numeral 10 designates the bolster plate of a press, having mounted thereupon a stationary die member 11, with which a cutting member 12 co-operates.

(Jo-operating with the die is another die member 13, carried by the ram or a movable part of the press, and this die member 13 co-operates with the member 12 to cut or shear the material 14 and is so shaped that it will pass between the

dies

11 and 12 to shape the material over the die 11, all in a. manner as well known in this art.

Encompassing the die 11 are a plurality of draw rings or blank holding members 1516, one arranged within the other, and these members 15 and 16 are respectively supported by means of

pins

17 and 18 that pass loosely through the bed or bolster plate 10.

Figure l Supported below the bolster plate 10 is a spring cushioning device, which is supported preferably by means of a bolt or member 19 secured by one extremity to the bed or bolster plate 10. Supported by the other extremity of the bolt 19 is a plate 20 held in position by means of a nut or collar 21 threaded upon the end of the bolt 19 and which nut or collar 21 co-operates with a shoulder 22 on the bolt 19.,

The plate 20 is spaced for any desired distance below the bolster plate 10, and encompassing the bolt 19 is a sleeve or collar .23 upon the top of Which the pins 17 rest.

The collar is of any desired length and is supported by means of a coil spring 24 which encompasses the bolt 19, one end of the spring engaging the collar 23 and the other end engaging a nut or adjustable collar 25 carried by the bolt 19, and by means of which collar 25 the normal tension of the sprlng 24 may be varied.

ncompassing the sleeve or collar23 is another collar 26 which carries an adjustable member 27 adjacent the lower face of the collar. Encompassing the spring 24 and the bolt 19 is another spring 28, one end of which engages and rests against the member 27 and the other end engages and rests against the plate 20. The pins 18 engage and rest upon the collar 26 and the spring 28 normally tends to hold the collar 26 elevated, and the collar is adapted to be depressed against the tension of the spring 28 in a manner to be hereinafter described. By adjusting the member 27 with respect to the collar 26 the normal stress of the spring 28 may be varied.

During the operation of the ress when the member 13 descends the blank oldin-gmeans 16 is depressed against the stress of the spring 28 through the medium of the pins 18 during one portion of the operation of the press, and during another portion of the operation of the press, the blank holding means 15 is depressed against the stress ofthe spring 24 through the medium of the pins 17.

During a portion of the operation of the machine and while the blank is being formed during the shaping of the article over the die 11 and blank holding means 15, it is desirable to lock the blank holding member 15 against operation, and this is acromplished in the following manner.

Supported bythe plate 20 is a bracket 29 which depends therebelow. Links 3031 are pivotally connected by one extremity as at 32. The free end of the link 30 is pivotally connected as at 33 with the bracket 29. The free end of the link 31 is pivotally connected as at 34 to a rod 35 which passes loosel through the plate '20 and is connecte as at 36' with the sleeve or collar 23,

a lost motion such as a slot 37 being prefern1aterial has bee-n par'tra ably provided at the pivot 34 to permitof the proper operation of the links.

The

links

30 and 31 and rod 35 are of such lengths that when the collar 23 is at the limit of its upward movement or in the position shown in Figure l, the

pivots

32, 33 and 34 will be in alinement and the collar 23 will be locked against movement as will also the. member 15.

The member 15 is locked against operation until apredetermined time in the cycle of operation of-the press, that is until the completion of the formation of the article over the die 11 and member 15.

Any suitable means may be provided for releasing the locking mechanism, such as a bar or rod 38 which passes loosely through a lug or projection 39 carried by the collar 26 and also loosely through the plate 20.

A nut 40 is carried by the rod 38 on one side of the projection 39 and a nut 41 is carried by the rod on the other side of the projection 39.

The nut 40 serves as a means for supporting the rod 38 and for raising the same to permit the locking mechanism to become active when the collar 26 is raised by the stress of the spring 28.

Vhen the collar 26 is depressed against the stress of the spring 28 the lug or projection 39 will engage the nut 41 to shift the rod 38 downwardly causing the extremity of the rod to engage a pin or plunger 42, moving the latter forwardly and into contact with the link 31 on one side of the pivot 32 so as to knuckle the

links

30 and 31 and thereby unlock the blank holding member 14 and permit it, together with the collar 23 to be lowered against the stress of the spring 24.

The end 43 of the rod 18 and the extreminvention will be clearly understood from the foregoing but briefly stated it is as follows. Assuming the parts to be in the position shown in Figure 1, and when the die I 13 is lowered the material 14 will be cut by means 16 will then bel against the stress oft the material is shaped ov {the die 11 an blank holding mean *fter the eomple-. tion of this step in I the projection 39 on co the nut 41 to force the b'ar or rod 38 downwardly and the plunger or pin 42 forwardly.

the

dies

13 and 12. [The blank holding-- .ered by the die 13.

28 until-tbs shaped and'unti'l ng of the article ar 36 will engage' the links 30 and 3i, thereby unlocking the Spring The latter will ngage ae link 31 to knuckle blank holding member 15. 4

A further operation of the die '13 in the same direction will cause the blank holding means to. be-depressed'so that the article may be finished or shaped over the die. 11

and the blank holding means 15 will then be depressed against the stress of the en the die 13 is withdrawn the

collars A

26 and 23 willbe moved upwardly by the eral parts, within the" sco What is claimed'as new is 3-. p, 1. A draw press including a plunger a stress of the

springs

28 and 24. This movementof the collar 23 will straighten the links 30-31 with respect to each other through the medium of the rod until the

pivots

32, 33 and 34 are brought in alinement --to again lock the blank holding means 15, '1 'Upon the upward movement of the collar .26 the lugor projection 39 will engage the nut'l) to raise the bar or rod 38 so as to permit the pin 'or plunger 42 to be retracted.

" While the preferred form of the invention plurality of separate spring controlled 3 blank holding means 1 adapted to succes sively co-oporatewith -the plunger to clamp the work, and means operable to positively- 'lockone of the blank holding means against operation during the operation of theiother blank holding means, the last recited means including a toggle like device and means. operabletov knuckle the said toggle device to release the blank holding means locked thereby.

2. A draw press including a plunger,- a

plurality of separate spring controlled I "blank holding means adapted to .succes sively co-operate with the plunger to clamp the-work, means operable to positively lock one 'of the blankholding means against operation during the operation of the other 1 blank'holding means, the last recited means includinga toggle like-device, and means controlled in its operation by the actuation of one of the said blank holding means for knuckling the said toggle to release the blank holding means locked thereby. 3 A draw press including a plunger, a'

' to clamp "holdin plurality of blank holding means adapted I to successively co-operate with the plunger the work, springs individual to the blank holding means and'against the stress of which springs the respective blank .holding means is operable under the stress of said plunger, a toggle like construction operatively connected with one of the blank holding means for locking the latter against operation during the operation of the other blank holding means, and means responsive to the operation of the said other blank holding means for knuckling the said toggle device to release the blank holding means that is locked thereby.

4. A draw press including a plunger, a plurality of blank holding means adapted to successively co-operate with the plunger to clamp the work, springs individual to the blank holding means and against the stress of which springs the respective blank operatively' connected with one of the blank holdin means for locking the latter against operation during the operation of the other blank holdin means, a. plunger operable upon the sai toggle device for knuckling the latter, and a shifting device operable means is operable under the stress of sai plunger, a .toggle like construction automatically at .a predetermined time in the cycle of o. eration of the press for actuating the sai plunger.

5. A draw press including a plunger, a,

plurality of blank holding'means adapted to successively co-operate with the plunger I to clamp the work, springs individual to the blank holding means and against the stress of which springs the res ective blank holdin meansis operable un er the stress of sai plunger, a toggle like construction operatively connected with one of the blank holdin means for locking the latter against operation during the operation of theother blank holding means, a plunger operable upon the said toggle device for knuckling the latter, a'shifting device" operable at a tion of the press for actuating the said plunger, and means ,for varying at will the time in the cycle of-operation -ofthe press at which the said plunger is shifted by the said shifting device.

names to this specification onthis 28th day of November, A. vD. .1924.

RAYMOND slnnvrs. .,FREDRICH J. RODE,

predetermined time in the cycle-of .opera- 3 In testimony whereof we have signed our I