US2196195A - Safety guard for presses and the like - Google Patents

Description

' April 1940- E. A. DESCHENES SAFETY GUARD FOR PRESSES AND THE LIKE Filed Feb. 28. 1939- Patented Apr. 9, 1940 2,196,195 r v SAFETY GUARD F o' a PRESSES AND THE; KE 7 Emile A. Deschenes, Salem, Mass., assignor to United-Shoe Machinery Corporation, Boroughof, Flemington, N. J., a'corporation of New Jersey Application February 28, 1939, Serial No. 258,985

5 Claims.

This invention relates tosafety guards for presses" and similar machines and is herein illustrated,"by way of example but noto'f limitation,

as 'embodied in a heel compressing machine of the 5 type disclosed in Letters Patent of the United Stats No. 776,823, issued December 6, 1904,01'1 theapplication of CharlesLlAllen'.

: InjtheQoperation of machines of this type, it

h occasionally occurs that the work not properly 10p1aced when presented to the presser members.

In'an "effort to prevent the'work from being damaged,- the operator sometimes attempts to straighten it after the machine has started. At

. ;,.sucffa time, the'operator' runs a serious risk of 1B"having his hand caught between the operating partsof the machine and being seriously injured. With a view to'preventin'g such injuries, devices havebeen suggested which require the use of the operators hands as well as his foot to start the gomachine. Such devices, however'are' unsatisfactor'y' because they furnish no protection after the machine has been set in motion. It has also been suggested that stationary guard fences beprovided'between the operator and the working parts 21y of'the machine. However, such devices have the disadvantage that in orderto have access to such parts, it is necessary to arrange the guard fence so, that it may be opened, and the operator will frequently leave the guard fencein open position. go' Furthermore on many'types of presses, it is impossible to find a place for a stationary guard fence of this type in a position where it will prop- I erly protect the operator and at thesame time not interfere with the action of the moving parts of 35- the machine. h

It is therefore'an object of thepresent invention to provide 'a guard 'fence'which will prevent the operator from putting his hands into the dangerzonebetween thepressure applying parts 6 f thehfachin'ebfit willnot interfere with the operation of the machine. It is a-further object of the invention to provide means connected to the guard fence which will prevent starting of the machine when the guard fence is open and will 45 prevent opening of the guard fence when the machine is running.

Accordingly, the invention comprises a safety device for presses and the like comprising a starting treadle, a reciprocating presser member, a

50 reciprocating guard fence mounted on the presser member by means permitting horizontal swinging movement of the guard fenceand means actuated by the horizontal movement of the guard fence for locking the treadle in inoperative position, the

a locking means being constructed and arranged to (Cl. 192-434)v prevent opening of the guard fence when the treadle is depressed.

j The invention will be further described with reference to the accompanying drawing, in which Fig. 1 is a front elevationof a heel compressing machine with the safety guard attached thereto;

Fig. 2 is a side elevationof the guard fence and reciprocating crosshead; and Fig. 3 is a view on a larger scale of the guard fence support, portions being broken away to show the keyway andthe arrangement of the detent pm. V I

The invention is illustrated as embodied in a heel compressing machine comprising a frame it carrying a vertically reciprocable crosshead l2. A v toggle M has its lower end pivoted on the frame it at IS, the upper end being pivoted to the crosshead I2. One end of 'a connecting rod I8 is connected to the center joint of the toggle. The other end of the connecting rod I8 is connected to 20 a crank provided with a flywheel adapted to be driven through a clutch (not shown) by a belt or an electric motor. In operation, the flywheel acts, through the crank andtoggle, to reciprocate the crosshead and compress the heels as they are insert ed in the machine. A treadle 22 fixed on a shaft 23 is connectedby the shaft to the clutch. The upper portion of the frame I0 is adapted to carry an upper mold 24, the lower mold (not shown) being carried, by, the crosshead l2. A feeding and ejecting mechanism 26 projecting for.- wardly from the crosshead i2 is provided to present the heels to the molds and to eject them from the machine after compression.

The guard fence 28 isan elongated wire frame extending from one side of the machine across the front thereof above the feeding mechanism 26 and covering substantially all of the open space between the molds. The guard 28 is adjustably fastened by screws 30 to a support 32 and may be raised or lowered soas to give just suificient clearance for a heel blank to be carried by the feeding mechanism ZB beneath the guard to the molds; The support 32 is bolted to an arm 34 held between the ends of a'forked bracket 36 which is fastened to the reciprocating crosshead. A rod 38 extending through the bifurcated end of the forked bracket 36 and the end of the arm 34 held therein is held against rotation relative to said arm by a keyway 40in the rod and a key 42 in the arm. The bracket 36 and the arm 34 may, however, move up and down-on the rod 38. The arm 34 carries a detent pin 44, the end of which is releasably held by a spring 46 in an aperture 48 in the forked bracket 36 and normally keeps the guard fence in its closed position.

The lower portion of the rod 38 is journaled in an arm of a bracket 52 bolted to the frame ID of the machine, the rod being held against vertical movement by collars 53 on either side of the arm 50. The lower end of the rod 38 is bent substantially at right angles to form a hook 54 the end of which is approximately parallel with the guard fence 28. The rod 38 is located sufliciently near the treadle 22 so that when the guard fence is opened, the hook' 54 is. swung under the treadle, thus preventing depression of the latter.

The treadle is held in its upmost position by a spring 56 and, while the guard 28 is in its closed position, may be depressed and released freely. When the treadle is in upmost position, however, the detent pin 44 may be pulled out and the guard fence 28 swung into open position. The key 42 and the keyway 40 compel the rod to rotate with the guard fence and the hook 54 is thus turned under the treadle 22, preventing depression of the latter.

If an attempt should be made to swing the guard fence to open position while the machine is operating and the treadle is in its down position, only a slight movement may occur before the end of the hook 54 strikes against a boss 58 on the side of the treadle 22 and prevents further opening.

When the machine is running, the forked bracket 36 which is bolted to the crosshead l2 moves upwardly as the crosshead rises to compress a heel, and carries the arm 34 and the guard with it. The guard is thus always maintained in the same position relative to the crosshead and feeding mechanism and does not interfere with the operation of the machine.

At the same time, however, when the machine is running, the guard 28 always remains in position between the operators hands and those portions of the machine most apt to cause him injury. The operator is thus completely protected against accidental movements of his hands into the danger zone between the compressing molds. Likewise, when the machine is at rest the guard may readily be swung aside to give access to the space within the machine for the purpose of changing molds and it will be impossible for the machine to be started until the operator has removed his hands from the danger zone and closed the guard.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent of the United States is:

1. A safety device for presses and the like comprising a starting treadle, a reciprocating presser member, a reciprocating guard fence mounted on said presser member by means permitting horizontal swinging movement of said guard fence, and means actuated by the horizontal movement of said guard fence for locking said treadle in inoperative position, said locking means being constructed and arranged to prevent opening of the guard fence when the treadle is depressed.

2. A safety device for presses and the like comprising a starting treadle, a reciprocating presser member, a rod, a guard fence slidably mounted on said rod by means permitting horizontal swinging movement of said guard fence with said rod, means for reciprocating said guard fence with said presser member, and means operated by said rod for locking said treadle in inoperative position, said locking means being constructed and arranged to prevent opening of the guard fence when the treadle is depressed.

3. A safety device for presses and the like comprising a starting treadle, a reciprocating presser member, a rotatable rod, a guard fence slidably mounted on said rod, means for preventing relative rotation of the guard fence and the rod, means for reciprocating said guard fence with said presser member, and means operated by horizontal movement of said guard fence for locking said treadle in inoperative position, said locking means being constructed and arranged to prevent opening of the guard fence when the treadle is depressed.

4. A safety device for presses and the like comprising a starting treadle, a reciprocating presser member, a rod, a guard fence slidably mounted on said rod by means permitting horizontal swinging movement of said guard fence with said rod, means for reciprocating said guard fence with said presser member, a hook at the lower end of said rod constructed and arranged to be swung under the treadle by the horizontal movement of said guard fence to prevent depression of said treadle, and a boss on the side of said treadle constructed and arranged to engage said hook and to prevent the guard fence from being opened when the treadle is depressed.

5. A safety device for presses and the like comprising a starting treadle, a reciprocating presser member, a rotatable rod, a guard fence slidably mounted on said rod, means for preventing relative rotation of the guard fence and the rod, means for reciprocating said guard fence with said presser member, a hook at the lower end of said rod constructed and arranged to be swung under the treadle by horizontal movement of said guard fence to prevent depression of said treadle. and a boss on the side of said treadle constructed and arranged to engage said hook and to prevent the guard fence from being opened when the treadle is depressed.

EMILE A. DESCHENES.

Images