US1103437A

US1103437A - Safety device.

Info

Publication number: US1103437A
Application number: US82764014A
Authority: US
Inventors: John Schade Jr
Original assignee: ALFRED C WESSMANN
Current assignee: ALFRED C WESSMANN
Priority date: 1914-03-27
Filing date: 1914-03-27
Publication date: 1914-07-14
Anticipated expiration: 1931-07-14

Description

J. SCHADE, Jn.

Y SA'FETY DEVICE.

APPLICATION FILED MAR. 27, 19144.

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1. SCHADE, JB.

SAFETY DEVICE. APPMUATON FILED MAR. 27, 1914.

' Patented July 14,1914.

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@maf/www l 65 ings, in which- JOHN SCHADE, JB., @F.NEW YQRK, N. Y., ASSIGNOR yF 'ONE-HALF T@ ALFRED C.'

WESSMANN, 0F NEW YB/K, N. Y.

SAFETY DEVECE.

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Specification of Letters Patent.

Patented Jelly *14, 191%.

Application filed March 27, 19M. 'Serial No. 627,640. i

the borough of Brooklyn, in 'the city and State of New York, have inventeda 'new' and useful Improvement in Safety Devices, of Whichthe following is a specification.A

"The object of my invention 4is to provide asafety device for reci rocatin machines,

` l@ such as power presses or pune ing, shearing, forming, forging, cte., which will auto,

' ma-tically control the movement' of the recip rocatingmember, should the operators hand bein any position within the operatingeld le of the press, -vvhere it might be iniured by the v4movement ofthe said member.

' A further 'object is to provide .a 'devicev that; is economic/al and inexpensive in they "manufacturqnnd 'one that can he 'readily' 20* appliedl to the' machines-now in eoinrnon'use,`

f r without reconstructi thereon. y r

A practical "embodiment of my invention is represented in the accompanymgydraw- Figurelgrepresents a 30 show the parts more clearly,-" i"g.3 .represents a detail plan view oi'fa partfof my da' vice on an enlarged scal`Fig4 .represents`- a front elevation of `the same showingthe parts in the position which they-will assume 35 when the`reciprocating member is at rest, Fig. 5 represents a view of the same showingl the parts in the positionwhich they assume when t he.reciprocating member is at work,

Fig. 6 represents a vertical section taken lin 40 the plane of the line A-A of Fig. 4, looking in the direction of the arrows, and Fig. 7 represents a horizontal section taken in the plane of the line B-B of Fig. 5, looking in' the direction of the arrows.

@5 The power press which l have illustrated yin Figs. 1 and 2 is one that is in common use and serves no'purpose other than to show one form of machine to which my safety device may be applied.

This power press consists of a frame denoted by 1, a .reciprocating meinber, fitted to slide therein, a drive shaft 3 mounted in the frame above the member 2, a drive Wheel,

4 loose on said shaft and a clutch 5 mounted 55 on said shaft and having a clutch releasing ng any of "the parts is 4constructed as follows.: The front elevation of a4 power press withemy safetyfdevice, applied theretoFig. 2 represents a side -elevation of the same, the drive wheelbein :removed to,

Withthe drive wheel by means of 'a spring 9. l

The ,clutch releasing 4lever 6 is indirectly operated4 from atreadle 1 0, fulcrumed at 11 'to'lthe side frame 12, .which treadle is con' a'stud`14jin:the-frame 12, by means of a rod15.

The treadlelO 'is held at the limit of its lupward 4movement vby arod 16 connected thereto and enacting with a spring 17 mounted` on the Jrframe 12. v i

A 'rod 18 extends upwardly .and connects therockingcrescent 13 with'the treadle actuated lever 19 vof a safety device which will behereinafterexplainedn A rod20 connects a lever 21 ofthe safety device lto the clutch releasing 2lever '6N The safety device is in'- -terposed between and connected tothe operating `treadle and clutch releasing lever and which the rod'l'S is connected is mounted .on a stud 22'xed'to the'base plate 23, .Which' is' secured by bolts 24 to Ithe frame 1. A rockingtoe 25 fis also loosely mounted 'on the lever 19'by a spring 26. A stop 27 is located onthe rocking 'toe 25 to be engaged by the lever 19 for lifting .the toe to its-normal po- -sit1on. f

two armed slide bar lever 28, mounted on a stud'29, liixed to the base plate,'has its up er' arm arranged to be engaged by the roc ing toe 25 and its opposite arm adapted to engage a slot in a horizontal bar 31,

This slidebar 31 is further provided with a'. slot 32 which is adapted ,to receive a lug '33 fast on 'the lookin ylever 21, which is also pivoted on the stu 22, and connected to the This locking lever .21 is heldin its normal position against a stop 34 fast on thebase plate, by 'a spring 35.

The lockin lever 21 is moved to its lock- 36 fast on the treadle actuated lever 19, which forces the lug 33into 'the slot 32 of the slide bar 31, as shownin Figs. 5 and`7.-

A. reciprocating guard 37' surrounds the clutch lslide 8 normally out of engagementjf nected to a lrocking crescent 13 mounted on i657 .at Y

ver 19 to 66" stud 22 and isyieldingly 'connected to the 135' which is mounted'to slide in the baseplate clutch releasing lever 6 through the rod 20. WW

ing position y the engagement of the lug W5 front of the reciprocating member at the point M0 of its contact with the work, and is adj ustabl secured to the lower end of a bar 38, whic is mounted to slide vertically in bearings 39,

40, fixed to the frame 1. The upper end of the said bar is turned laterally, as shown at 41, for the purpose of attaching `one end of a' `bearing I39, and the other end passing through the portion 41.

The guard 37 may be adjusted on the bar I38 and locked thereto by means 'of the thumb screw 47 andclamp 48. .l

l Inoperation: As'the operator presses the treadle 10 down, it will carry with it the rod 15, the rocking crescent 13, the rod 18 and the treadle actuated lever 19. The lever 19 being connected to the rocking toe 25 by the spring 26 will cause the toe 25 to rock and force the two armed slide' bar lever 28 forward, which, in turn, rocks on its pivot-29 and slides the slidebar431 rearwardly, whlch will, through its flexible connection, pull the lbar 38and the guard 37 downwardly so as to'surround the operating'eld of the press. The complete downward movement of the lever 19 will pull the toe 25 so that the lever 28`will push the slide bar 31 rearwardly f until the slot 32 will be in register with the itsworl'r, in the usual manner.

lug 33 on the locking lever 21 whence the lever 19,'with its lug 36, will force the lever 21 and lug 33 down to the limit of its movement, as shown in Figs. 5 and 7, in which position the clutch releasing lever 6 will be removed 'from the-clutch by the rod 20,

thereb.` allowing the clutch slide 8 to en-y gage t e drive wheel, which will rotate the shaft and force thereciprocatin member to hould there be' any obstruction beneath the guard 37, suchas the operators hand, the guard will be held against completing itsA downward movement which will prevent the slide bar 31 from moving rearwardly its full stroke, so that the slot 32 will not register with the lug 33 on the lever 21 and thelever 19 will continue in its downward movement until its lug 36 strikes the lever 21, which, with its lu 33 resting on top of the slide bar 31, will hcd the ylever 19 until the obstacle is removed or until the pressure is removed from the treadle. It will be seen that if the slide bar cannot travel rearwardly its full stroke, the lever 28 and toe 25 will hold the same position, while the lever 19` still travels downwardly t0 the. limit of its movement, thereby putting the spring 26 to its tension. The tension of this spring 26 is all that the operator will feel if caught under theguard 37, It is necessary that the guard must travel down to within a distance of the work where itis impossible to get the operators hand or finger beneath the reciprocating member, before the clutch releasing lever 6 is withdrawn.

While I have shown a reciprocating guardy 37 in the form of a bar, it will be understood that any form of shield might be fixed thereto, according to the protection desired tol cover the operating field of the press.

It is evident that slight changes might be resorted to in the form, construction and arrangement of the several. arts withoutdeparting from the spirit',` an scope of my invention; hence I do not wish to limit myself strictly to the structure hereinset forth, but

What I claim is:

1.- The combination withthe clutch of' a powerpress and an operating treadle therefor, and a clutch releasing lever, of a reci rocating guard adapted to be moved by te treadle into ing eld of t e press, and means interposed 'between said treadle and lever, comprising a slide bar exibly connected to said guard, a lever engaging said bar, arocking toe engaging' said lever, a treadle actuated lever having a yielding connection with said toe,

'alocking lever connected to said releasing Alever coacting with the treadle actuated lel ver, whereby the com letedownward moveosition to protect the operat- A ment of the guard wi l permit the treadle to actuate the clutch.

' 2. The'combination with the clutch of a power press and an operating treadle therefor, and a clutch releasing lever, of a reciprocating guard adapted to be moved by the treadle into position to protect the operating fieldl of the press, and means interposed between said treadle and lever, comprising a slide bar having a recess therein and flexibly connected to said guard, a lever engaging said bar, a rocking toe engaging 'said lever, a treadle actuated lever having a yielding connection with said toe, a locking lever provided with a lug arranged to enter 'said recess in the slide bar for locking the same, said locking lever being connected to said releasing lever and coacting with the treadle actuated lever, whereby the complete downward movement of the guard will per-A ineens? clutch.

4. The combination with the clutch of a ower press, and an operating treadle thereor, and a clutch releasing lever, of a vertically reciprocating bar mounted on the press, a guard adjustably secured thereto, and means interposed between the treadle and lever under the control of the treadle for moving the reciprocating bar with its guard Iinto position to protect the operating field of the press, said means comprising a slide bar having a recess therein and exibly connected to said reciprocating bar, a lever engaging said slide bar, a spring for returning the guard, reciprocating bar, the slide bar and the lever to their normal positions, a rocking toe engaging said'lever, a treadle actuated lever having a yielding connection with said toe, a locking lever provided with a lug arranged to enter said recess in the slide bar for locking the same, said locking lever being connected to said releasing lever, and coacting with the treadle actuated lever, whereby the complete downward movement of the guard and bar will permit the treadle to actuate the clutch.

5. The combination with the clutch of a power press, and an operating treadle therefor, ,and a clutch releasing lever, of a vertically reciprocating bar mounted on the press, a guard adjust-ably secured thereto, and means interposed between the treadle and lever under the lcontrol of the treadle for moving the reciprocating bar with its guard into position to protect the operating field of the press, said means comprising a slide bar having a recess therein and flexibly connected to said reciprocating bar, a lever engaging said slide bar, a spring for returning the gn ard, reciprocating bar, the slide bar and the lever to their normal positions, a rocking toe engaging said lever, a treadle actuated lever having a yielding connection with said toe, a locking lever provided with a lug arranged to enter said recess in the slide bar for locking the same, a stop for limiting the upward movement of the lock? ing lever, a spring for drawing said lever to said stop, said locking lever being connected to said releasing lever, and coacting with the treadle actuated lever, whereby the complete downward movement of the guard and bar will permit the treadle to actuate the clutch.

6. rlhe combination with the clutch of a power press, and an operating treadle therefor, and a clutch releasing lever, of a vertically reciprocating bar mounted on the press, a guard adjustably secured thereto,

and means lnterposed between' the treadle and lever under the control of the treadle for moving the reciprocating bar with its guard into. position to protect the operating field of the press, said means com rising a slide bar-'having a recess therein and exibly connected to said reciprocating bar, a lever engaging said slide bar, a spring for returning the guard, reciprocatingbar, the slide bar and the lever to their normal positions, a rocki toe engaging said lever, a treadle actu-atg lever having a yielding connection with said toe, a locking lever rovided with a lug arranged to enter said recess in the slide bar for locking the same, a'stop for limiting the upward movement ofthe locking lever, a spring for drawing said lever to vsaid stop, said locking lever being connected to said releasing lever,'said treadle actuated lever being provided with a lug for engaging said locking lever to move it into locking engagement with the slide bar, whereby the complete downward movementfof the gaurd and bar will permit the treadle to actuate the clutch.

In testimony, that I claim the foregoing as my invention, I have signed my name in presence of two witnesses, this sixteenth day of March 1914. A

JOHN SCHADE, JR. Witnesses:

F. GEORGE BARRY, C. S. SUNDGREN.