US2383221A - Safety attachment for presses - Google Patents

Description

Aug. 2 1, 1945. .1. E. SKOOC SAFETY ATTACHMENT FOR PRESSES Filed April 21, 1944 v 5 I INVENTO R Jase 0% 15f Patented Aug. 21, 1945 f r is i vention-relates amassing; attachment 0 a p ss z ay be'soperated; by: either foot or power. A

An :operator of a lpress -where smallwwork is handled :frequently: faiis 1170 remove his, lfingers' from beneath eth'e Q plunger which 1 descends upon the work,-therebm causing 'injury .to'rthe operator. I

An attachment (topreventthe flngersffrom being injured has been. provided {on a press but such an attachment is 't rrequcntly.ycomplicated: 'or re- :quires springs to'operateit-or may limit the movementof .the punch carrier-or restrict'the operation-oflthe press, l 1

One of theobjects ofrthis inventionaisto :pro-

videl-asafety-attachment for use'on'a foot or power .press which will be extremely 'rsimple in construction and :yet will effectively 'proteot zthe the punch carrier to bellimited irrany of its movemerits, .the safety -attach-ment. irather 1 being of such an. arrangement that the l punch carrier may be liftedc so as tto entirely clear the attachment from the die-and rwork- 'and l-permitl free manipulation of the work.

Another object of the invention is to provide a safetyattachm-eritwhich by reason of its arrangeis positioned on the die .Fig. '4is' arplan viewof then-rain memberofthe safety=attaohmentin blanked out form 1 vFig. 5 is=a-perspective-view of'themember bent toshapeyw a Fig. 6 isa sectional view. on-substantiallytline .Figs 7 is a sectional view on strbstantiallyline l In proceeding ;with this invention :I provide a guard which. may conveniently be formed. at the end of an arm and supportflthe same in depend- .entrelationon :a pivot, l-the positionrof ther arm being controlled bya.stopaso 'thatwhen-the arm descends to :engage the i die the I angular relation of ;.the arm will .besuchlthat the guard willbe moved by theIdie-in theadesireddirectionacross l thepath; of the descending 'punch. Themount- I ing oflthe arm willybesuch thatpgravity holds the same, iniposition .andno rsprings are lrequired.

With reference to the drawing till-designates the upwardly extending casting'of a presswfrom which an .overarm extends frmounting the 'reciprocating head H. in which -the ;-punch carrier 12 .-is secured lbylmeansof the -set screw 43 engaging theIstud M-of the-carrier. Axpunch I is mountedin thiscarrier tz byrmeans of the set screw 1.6 engaging,lthe shank 441". thereof. The

.bed of the press-t8 suitably mounts-ilthe'di'e block is by means of the set screw-20.. 'I-hework-ZI engaged by punch li -as itl descends.

-fIhe safety attachment-consists essentially of a .member. designated \generally ;.and shown in perspective. at Fig; 4. .A guardlfor swingingacross ment need not be touched or in any way manipulated when the punch carrier descends upon the die after being lifted free from contact therewith. With these and other objects in view, the inl vention consists of certain novel features of construction, as will be more fully described and particularly pointed out in the appended claims.

In the accompanying drawing: Fig. 1 is a sectional view of fragmental portions of a press illustrating the punchand its carrier and my attachment in position thereon, the dotted lines indicating the lower position of the punch in engagement with the work and the relative position of the attachment with respect thereto;

Fig. 2 is a sectional view on substantially line 2-2 of Fig. 1;

Fig. 3 is a perspective viewof the safety attachment; l

.the pathot movement of the. punch carrier and punch' is conveniently formed integral with the. member such for instance as by rolling the end of the sheet stock 26 as at 21. This portion 21 will be of a width desirable for sweeping across the work so as to remove any fingers which may .be located at any point about the Work and. in

the path of travel of the plunger or punch. In

order to conveniently space this sweep armor guard 2Tabove the work I .providefianges 28 on either end of this portionZ'l (see Fig. 6). These flanges 28 are the heads of shank portions 29 extending into the hollow 30. of the roll 21 at the end of the member 25. ,These flanges 28 are of 1 a distance apart to span the work and are in fixed relation with reference to the portion 21 but will be of a dimension to space it above the work as the portion 21 moves thereover. l The sheet stock 26 of the member designated generally 25 is slit as at 31 and 32, (see Fig. 3),.

to provide three arms 33, 34, and 35. The ends of each of these arms are rolled to provide hinge eyes 36, while the arms 33 to 35 are bent at right angles to the sheet stock 26 (see Fig. 4) so as to provide offset arms. A cut-out portion 31 in the sheet stock 26 is formed through which the punch l5 may pass. The member 25, however, may comprise any connection between the hinge mounting and the guard such as merely an arm comprising the portion 38 at one side of this opening and which also will be at one side of the plunger.

This member may be mounted directly upon the punch carrier in a pivotal manner through the hinge eyes 36 but a more convenient manner of handling the attachment 'so that it will be complete within itself is to provide a block or member 40 carrying a pivot pin 41 at its. lower end 42 for the hinge eyes'36 of the arms 33 and to engage as shown in Fig. 3. This block also carries anabutment 42 which maybe in the form of a threaded bolt having threads 43 to extend into the threaded opening 44 in this block 40. -This abutment 42 is so positioned-that it will be engaged by the rounded end 36 of the arm 34 forminga stop for locating the member 25 at the angle shown in Fig. 1. The block 40 may be secured to the carrier I2 in a suitable recess 41 by a bolt 45 passing through the opening 46 of this block to secure it in place. The

edges of the recess prevents the block from rocking about the bolt 45.

The abutment 42 will be adjusted to engage the arm 34 so that the lower guard end 21 of the member 25 will always be positioned on the opposite side of a vertical passed through the pivot pin 4|. A portion of the guard at the left of the pivot pin 4 I, illustrated in Fig. 1, is heavier than the portion of the guard at the right of the pivot pin thus always maintaining the guard and its lever arm 25 in substantially the angular position as shown in Fig. 1, even though this attachment is lifted clear of the die block I9, as shown in full lines in Fig. 1. An angularity, however, will be maintained such that when the carrier and the attachment descend so that flanges 28 of the guard engage the die block IS, the die will then sweep forwardly across the work 2!, but out of contact therewith, into the dotted line position as shown in Fig. 1, so as to remove any persons fingers which mightbe in the path of travel of the punch.

By balancing the lever arm and guard, in the manner herein illustrated, no springs are re-' quired and the'carrier may be lifted with its attachment clear of the work that the die may be easily manipulated and no attention need be paid to the attachment when the carrier with its punch descends. There is no possibility of the attachment jamming because ofthemaintained angular relation.

The attachment complete as illustrated in Fig. 3 maybe easily secured in place by a single bolt and all parts may be preadjusted if desired.

It will, of course, be apparent that as theguard is swept across the work the plunger willpass into the opening 31 in the sheet stock of the member 26 so as to engage the work.

.I claim:

1. A safety attachment for a press having a reciprocating punch carrier and a die block comprising a. member carrying a guard, means to pivotally support said member in a dependent relation on said punch carrier clear of the die block, and an adjustable stop to engage said member to position the same at such an angle to said'die block'that the guard will engage the die block and sweep a'crossthe path of movement of the punch carrier as the same descends.

2. A'sa'fety attachment for a press having a reciprocatingpunch carrier and a die block comprising a-rmember' having an offset arm and carrying a. guardat one side ofthe arm, means to pivot said offset arm, a stop to engage the member on the side of 'the pivot distant from the guard, said guard being of a weight to gravitationally causeyengage'ment with said stop, said guard being in a dependent relation from said pivot means at the other side of a vertical through said pivot froin'said stop.

3. A safety attachment for a press having a reciproacting punch carrier and a die block comprising a member having an ofiset arm and carrying'a. guard at one end portion of the arm, means to pivot said ofisetarm, 'a stop to engage the lever at the other end portion of said arm, said guard being of a weight to gravitationally cause engagement with said stop, said guard being in adependent' relation from said pivot means at the other side of a vertical through said pivot from said stop and at such an angle to said die block that the guard will engage the die block and swing about its pivot to sweep across the path of'movement of the punch car- 60 rier as the same descends.

4. A safety attachment for a press as set forth in claim l'wherein the guard has flanges thereon positioned at either side of the work to engage the die and space the guard from the work in its movement across the die.

JOSEPH E. SKOOG.

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