US1169684A - Safety device for power-presses. - Google Patents

Description

Wl /VESSES N. SHEFF.

SAFETY DEVICE FOR POWER PRESSES.

APPLlcA-IONVHLED APR. 9, |915.

Patented Jan. 25, 1916.

EM @ci THE CQLUMBIA PLANOGRAPH C0., WASHINGTON. D. C.

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SAFETY DEVICE FOR IPO"VVER-PRlESSElS.

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Specrication of Letters Patent. l Patented Jam, 25, 19316.,

Application led April 9, 1915. Serial No. 20,179.

To all whom it may concern:

Be it known that l, N ons Srinrr, a subject of the Czar ofRussia, and a resident of the city of N ew York, borough of Brooklyn, inthe county of Kings and State of New York,have invented a new and Improved Safety Device for Power-Presses, of

which the following is a full, clear, and exact description.

lThe object of the invention is to provide a new and improved safety device for use on -foot or power' presses and similar machinery, and arranged to prevent the movable press head from descending to final position as long as the operators hand or hands are in position between the the fixed die. Y

ln order to accomplish the desired result, use is made of a safety device pivotally mounted on the `press to' move up and down in front of the press head and the fixed press die, the said safety device being normally positioned at a distance above the fixed press die, a controlling device for the movable press head, and an actuating connection between the said safety device and the said controlling-device to normallv impart an up and down swinging motion to the said safety device and to render the said controlling device inoperative on an obstruction in the downward path of the safety device.

A practical embodiment of the invention is represented in the accompanying drawings forming a part of this specilicatiomin which similar characters of reference indicate corresponding parts Vin all the views. l

Figure l is aside elevation of the safety device in inactive erator to place the work in position on the die or remove it therefrom; Fig. 2 is an enlarged sectional front elevation of the safety device with the parts in inoperative position; Fig. 3 is a similar view of the same with the parts in position for connecting the friction clutch with the crank shaft` in case no obstruction is in the downward path of the safety device; and F ig. lis asectional plan view of the safety device as applied,

rlChe foot power stamping press,illus press head andposition to allow the op-y trated in the-drawings, is mounted on the usual frame A on which is fulcrumed a treadle B connected by a two-part rod C, C with a clutch mechanism D for connecting ythe driving part E of the press with the crank shaft F used for imparting an up and down reciprocating movement to the press head G carrying a punch or other die H, which operates in conjunction with the usual fixed die l on the frame A. The safety device is connected with the two part rod C, C and ithconsists of a guard J extending horizontally across the front of the press and adapted to move-up and down between the top of the fixed die l and the front of the press head Gf. 'l1-he guard J extends from the forward end of a transversely extending lever J fulcrumed at its rear end .l2 on one side of the frame A, and the said lever J is provided with a pivoted button J3 engaging a notch C2 formed in a cylindrical head C3 attached to the upper end of the pedal part C of the two-part rod connecting the treadle B with the clutch mechanism D.

The head C3 is mounted to slide in a bearing K attached to the frame A and in the said head C3 is mounted to slide a head C* attached to or formed on the lower end of the rod part C'. rlfhe mo'vement of the head C* in the head C3 is limited and this movement can be adjusted by a screw plug C5 screwing in the upper end of the head C3 and which screw plug is adapted to abut against the top plate K of the bearing K. The downward movement of the head C3 is limited by the bottom of the bearing K and the arrangement is such that when the rod C is moved downward on the operator pressing the treadle B then the screw plug C5 engages the top of the head C4 prior to the bottom of the head C3 reaching the bottom K2 of the bearing K (see Fig. 3). Thus when the treadle B is pressed and the rod C moved downward then a downward swinging movement is Vgiven to the lever J and consequently to the guard J, and during the time the head C3 moves from the position shown .in Fig. 2 to the position shown in F ig. 3 the head C4 and the rod C remain stationary so that the clutch mechanism D y remains inactive. Now in case the operators hands areY ystill at fthe die I then the guard J strikes the .'hand and in doing so prevents the operator from further pressing the treadleA B downward to pull the rod lpart` C and the clutch D into active position. in

the latter and the rod parts C, C and the v.clutch D are returned to -usual normal position together with the safety device J From the foregoing it will be seen that by the arrangement described the clutch mechanism D cannot be actuated as long asy the operators hand or any other obstruction is in the path of the Vdownwardly swinging guard J so that the operators hand'is not liable to be injured by the descending punch or die held on the press rhead Vl-avingthus describedY my invention, I

claim as new and desire to secure by Letters Patent:

l. The kcombination with a power-operated press having a movable press head, and a controlling device for the same including members one of which has alimited movement relative to the other, ofa safety device pivotally mounted on the press to move up and down infront of the said press head and i'ixed press die, the: said safety device being normally positioned at a distance above ythe press-die, and an actuating connection between the said safety device and lone of the members of the said controlling .dev-ice to normally impart an up and down swinging motion tothe said safety device and` to render the said controlling device inoperative on an obstruction in the downward path of the said safety device.

`2. 'ln a power-operated press, the combination of av treadle, a'clutch'mechanism for vconnecting and Vdisconnecting the movable press head relatively to the driving member of the press, a two-part rod connecting the treadle withthe clutch mechanism, the rod parts having heads slidable one on the other,

Y and a safety device pivoted on the said Ypress to swing up and down in front of the press, the safety device being connected with one of the said rod part heads.

3. in a power-operated press, the combination of a treadle, a clutch mechanism fork connecting and disconnecting the movable press head relatively to the driving member of the press, a two-part rod connecting the treadle with the clutch mechanism, the rod parts having heads, of which one has a limited sliding movement on the other, a casing fixed on the press and in which the head of the rod part connected with the treadle has a limited sliding movement, and a safety guard pivoted on the press and connected with the said head on the treadle part, the said safety guard extending in front of the press and being adapted to part of the rod, and the said head of the treadle part has a limited sliding motion in the said bearing and is pivotally connected with the said guard lever.

5. A press guard, comprising a lever pivoted on the press and having a guard arm extending horizontally across the front of the press, a bearing attached to the press, and a rod connecting the treadle with the clutch of the press, the rod being made in two parts having heads, of which the head of the clutch part of the rod has a limited slidable movement in the head of the treadle part of the rod and the said head of the treadle part has a limited sliding motion in the said bearing and is provided with a notch, and a button pivoted on the guard lever and engaging the said notch.

6. A press guard, comprising a lever pivloted on the press and having a guard arm extending horizontally across the front of the press, a bearing attached to the press, a rod connecting the treadle with the clutch of the press, the rod being made in two parts havingk heads, of which the head of the clutch part of the rod has a limited slidable motion kin the head of the treadle part of the Vrod and the said head of the treadle part has a limited sliding motion in the said bearing, and means for regulating the slidving motion of the head of the clutch part ment to move the 'same into active position, name to this specification in the presence of the engagement of the safety device during two Subscribing Witnesses. its downward movement with an obstruction preventing the movement of the last NHA SHEFF mentioned member of the controlling device Witnesses:

into active position. JULIUs H. SEIF,

In testimony whereof I have signed my MAX SHERESIIEVSKX.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner o1 Patents, Washington, D. C.

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