US1257759A - Safety attachment for machines. - Google Patents

Description

A. STIER.

SAFETY ATTACHMENT FOR MACHINES.

APPLICATION FILED AUG-1.19m.

Patented Feb. 26, 1918.

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SAFETY ATTACHMENT FOR MACHINES.

APPLICATION-FILED AUG- 7, T916.

1,257,759. Patented Feb.26,1918.

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ABRAHAM s'rmn, OF BROOKLYN, NEW YORK.

SAFETY ATTACHMENT FOR MACHINES.

Specification of Letters Patent.

Patented Feb. 26, 1918.

Application filed August 7, 1916. Serial No. 113,417.

To all whom it may concern:

Be it known that I, ABRAHAM STIER, a citizen of the United States,-and resident of Brooklyn, in the county'of Kings and State of New York, have invented certain new and useful Ii'nprovements in Safety Attachments for Machines, of which the following is a specification.

This invention relates to safety attachments for machines and more especially metal working machines such as presses where parts of the machine are caused to move and approach each other while the operator is feeding material and runs the risk of having his hands or limbs caught between said moving parts.

The device consists of certain mechanism moving in advance of dangerous parts of the machine and controlling the clutch on the power shaft and preventing the same from connecting the driving means with the operating shaft of the machine when they said mechanism is obstructed by the finger or limb of the operator.

These and other objects and details of the invention are more fully described in the following specification, set forth in the claims, and illustrated in the accompanying drawings, wherein:

Figure 1 is a front view of a metal stamping or punching press frame showing the invention applied thereto. t

Fig. 2 is a plan view of the attachment.

Fig. 3 is a side view of the same.

Fig. 4 is a view similar to Fig. 1 but with the attachment in its lowered position.

Fig. 5 is a side view of the same.

The drawings show the front of the frame 10 of a metal press in which is mounted the shaft 11 for operating a slide that works in the guideways 12 and 13 and stamps or punches metal or other material supported on the base 13.

The guide way 12 carries a bracket 14 extending to the right of the frame and secured thereto by the bolts 15 which also connect the guides to the frame at each side. These bolts also secure vertically adjustable brackets 16, passing through slots 17 and adapted to be tightened after proper ad- 'ustment is secured. Extensions 18 at the lower ends of these brackets are adjustable horizontally and carry and are connected by Pivoted to the cross bar 90 are two levers 21 and the former lover being practically a yoke as shown in Figs. 2 and 5, with both sides pivoted on the bolt 23, and to the short arms 2 1 and. 25 of the levers are attached links 26 and 27.

The bracket 14 carries a shaft 29 having at one end an arm 30 supporting the upper ends of the links 26 and 27 and at the other end of the shaft is an arm 31 to which is attached the trcadle rod 32.

The clutch latch of the machine is operated by rods and 37 which are loosely connected by the coupling 38 carried by the rod 33 and in which the rod 37 loosely travels. Stops 40 on the latter rod are engaged by the coupling and operated when. the rod 33 is drawn downward by the forked arm at]. to which the rod is secured by a pin 42 passing throng] an eye at the lower end of the said rod. lhc roa. ")2 passes througi i and secured to the head 4-3 of the pin 42 and when the troadle is depre l. the clutch will operate if the levers 11 2 .id 22 are able to pass each other.

To operat the with Whirl the usual treadle ines are provided is :2 is t'lltl'lSi'. downward, and esevating the arm :Ztland, 27, causing the o approach each other and as the lever is'the longer and lever free to p; the .t. the latter does 'so if no ob: -:truct1on intervenes.

If, however, an object such as a hand or finger should be in line with the slide and be in danger of injury it will also be in the path of the closing levers as shown in the dotted lines in. Fig. 1 and will act as an obstruction to their closing and passing each other to the position shown in Fig. l. lVhen occupying the latter position the clutch connects the parts so as to cause the downward movement of the slide, but if a finger or hand obstructs the movement of these levers and prevents their movement beyond the position shown in dotted lines in Fig. 1, the treadle rod will be likewise prevented from moving far enough to throw the clutch parts into engagement. During the operation 0:!

the machine, the levers 26 and 27 will continue to pass each other until an obstruction is presented to their movement.

The lever 22, or both levers 21 and 22, may be faced with rubber 36 to prevent injury to the finger or limb it may come in contact with.

The length of the levers 21 and 22 and the arm 80 tends to materially weaken the power of these parts when an object is caught between them and although imparting only a slight pressure, the levers will retard the movement of the treadle and the operation of the clutch.

It is ob ions that this device may be applied to similar machines where it is necessary for workmen to expose their hands or limbs and where the movement of the levers or arms will control the movement of the driving shaft or other important parts.

The parts may also be otherwise arranged or modified without departing from the essential features above described or from the scope of the appended claims.

A spring 39 on the rod 33 returns the rods and the other parts to their places when the treadle is released.

lVhat I claim as new is:

1. In a safety attachment for machines, the combination with a machine frame and a clutch, of a treadle rod adapted to operate the clutch, levers pivotally mounted upon a fixed support and adapted to pass each other, and means positively connecting said levers with said treadle rod whereby the movement of said treadle rod will be arrested by an interruption of the movement of said levers.

2. In a safety attachn'ientfor machines, the combination with a machine frame, of a shaft and clutch, a treadle rod to control the clutch, levers pivoted to the frame and adapted to pass each other, an arm connected with the rod, and a second arm on the same shaft as the first and connected with the levers. y

In a safety attachment for a machine, the combination with a machine frame, of a driving shaft, a clutch, levers pivoted at the front of the machine and adapted to pass each other, a rod ada ted to o crate the clutch, a shaft at the si e of the rame, an arm on the shaft and connected with the rod, a second arm on the shaft, and links connecting the latter arm with the levers.

&. In a safety attachment for a machine, the combination with a machine frame, of slotted brackets adjustable at the front of the frame and carrying a cross bar, levers pivoted to the cross bar and adapted to pass each other, a shaft with a crank arm, links connecting the crank arm with the levers to swing them on a pivot, a second arm on the shaft, a rod connected with the secmid arm and adapted to be operated by the machine attendant, a rod connected with the clutch of the machine and having stops. and a rod with a spring interposed between the clutch rod and the operated rod.

5. In a safety attachment for a machine, the combination with a machine frame, of bracket adapted to be adjusted on the front of the frame, a cross bar carried by the brackets, levers pivoted on the cross bar, a shaft at the side of the frame, an. arm on the shaft, links connecting the arm with the levers, a rod with stops connected with the clutch of the machine, a second rod having acoupling for the first rod, a spring, and an operating rod connected with the second rod and operating the levers.

Signed at New York, in the county of New York and State of New York, this 25th day of July, A. D. 1916.

ABRAHAM STTER.

00p! a! flail pltelt my be obtained for five cent: each, by addressing the "Commissioner of Patents,

Washington, D. C.

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