US1448209A - Safety device for presses - Google Patents

Description

Mar. '13, 1923. 1,448,209

F J. GIBBONS SAFETY DEVICE FOR PRESSES Filed. July 10, 1922 mzz7f J GEM-072's ay am fi s Patented Mar. 13, 1923.

FRANK J. GIBBONS, 0F WORCESTER, MASSACHUSETTS.

SAFETY DEVICE FOR Application filed July 10,

To all whom it may concern:

Be. it known that I, FRANK J. Ginnons, a citizen of the United States, residing at Worcester, in the county of Worcester and State of Massachusetts, have invented, a new and useful. Safety Device forPresses, of which the following is a specification.

This invention relates to a device for-preventing the descent of the plunger of a hand fed press from catching and injuring the hand of the operator.

The principal object of. the invention is to provide a positive acting means which can absolutely be depended upon to act every time the plunger descends, even if that descent is irregular or accidental, to positively withdraw thehand of the operator from a position under the plunger which it normally assumes when feeding blanks to the press. The invention also involves the provision of. means to be worn on the wrist of the operator to co-operate with the other mechanism to positively insure the above mentioned action and the provision of this mechanism in a simple and inexpensive form suitable for attachment to any ordinary type of press.

Further objects and advantages of the invention will appear hereinafter;

Reference is to be had to the accompanying drawings, in which Fig. 1 is a side view of a press of.- well known type with a preferred embodiment of this invention applied thereto, and shown in position for feeding the blanks to the press when the plunger is raised; p

Fig. 2 is a front elevation showing the. parts in the position assumed when the plunger is depressed;

Fig. 3 is a side view of certain parts of the device on an enlarged scale;

Fig. 4 is a plan of the attachment worn by the operator with the strap broken away, and

Fig. 5 is a side elevation of the same with the strap and bar which operates the device in section.

The invention is shown as applied to a well known type of reciprocating press to which the operator feeds blanks by hand. This press has the usual table 10 and lunger 11. The rest of the press need not e described as the invention is independent of it. On the plunger is mounted a stud 12 shown in this instance as perforated but preferably having means for the free pas- 1922. Serial No. 573,915.

sage of a flexible non-stretchable connection: 2

13 which operates thesafety device from the plunger. This stud 12 is mounted on the plunger itself and of, course it moves up and down with itpositively. l

The flexible connection 13, which, may bev in the formof a belt or chain or cable, passes from the stud 12 in opposite direction upwardly and. each strand extendsiover-a pulley 14. These pulleys are mounted to swing,

on links '15 which support; them from above.

These links are connected at any desired point along a pair of brackets 16 mounted on the frame of. the. machine above the plunger. The brackets are perforatedgto receive the links at; different distances fromthe frame of the machine to accommodate different types of presses and work. Each end of the flexible connection 13, passes down from thepulley 14 and is connected with a metal link 17 which is pivoted. through one. of a seriesof perforations in anarm18 fixed This shaft is r to a transverse shaft 19. mounted in hearings on a; pair of brackets 2Qfixed on the press belowthe table. It

also'has: another arm 21 which is. adjustably mounted upon it and is provided with a head 22. These parts are duplicated at the other side of the press. This head=hasthree or more perforations 23 for an operatingrod 24. This operating rod extends across the press in front of the table thereof and can be placed in any one of the perforations 23 to locate it at different distances from the table.

From what has been said, itwill; be obvious that every time the plunger 1.1 descends both of the strandsof the flexible connection 13will be pulled down at the center and consequently the links 17 willv This I action is; positive. and there is no 'lostmotion in it. It results. in

be pulled up.

tightening up the strap, will rest against the lower side of the wrist. Extending down from this plate is a stop 2? in a plane at right angles t the plate and to the direction of the rod 24. This is preferably hooked over at the bottom so that after having placed it in position, it will engage the rod and the operator'will feel the pressure if she lifts her hand away from the rod 24:.

lln ordinary operation, she has to rest her hand, or rather the plate 26, on therod with the plate'Q? in front of it so that every time this rod moves forward th operators hand is moved forward by power at the same'time and it is moved out of the way before the,

plunger descends into contact with the table. This constitutes a positive and certain safety device which, as long as the operator has it on and is working on the press, will never fail to draw the hand away from danger at all times. It does not interfere with thefeed of the press by the operator and is comparatively inexpensive to make, and'install. It also has no electric connections.

Another advantage is that the device prevents the thrusting f the hand too far into the press at all times.

Although I have illustrated and described only a single form of the invention, I am aware of the fact that modifications can. be made therein by any person skilled in the art, and that it can be applied to other types of presses thatthat shown, without departing from the scope of the invention as expressed in'the claims. Therefore, I do not wish to be limited to all the details of construction herein shown and described, but what I do claim is lChe combination with a press having a table and reciprocating plunger, of a flexible connection connected with the plunger and positively moving therewith, a movable transverse rod. mounted to move toward and away from the press table, means connected with the flexible connections for moving said rod as the plunger descends, and means adapted to be worn on the wrist of the operator for engagement with said rod.

2. The combination with a press having a table and reciprocating plunger, of a flexible connection connected with the plunger to positively move therewith, a lever connecmasses ted with said flexible conection, and adapted to be swung by it on its pivot, said lever having mounted thereon a transverse rod in position to swing away from the press table as the plunger descends, and means adapted to be worn by the operator for engagement with said rod, whereby the hand of the operator will be moved away from the plunger positively every time it descends. i J

3. In a safety device, the combination with a reciprocating press head and plunger, of

flexible connection movable with the plunger, a shaft transversely located, an arm on said shaft connected with said flexible connection and adapted to be raised by it when the plunger descends, a'pair of arms on said shaft having means for supporting a transverse rod, whereby said rod will be moved when the plunger moves, a strap adapted to be 'worn around the wrist of the operator, and a plate extending down from the strap and adapted to engage the-rod to provide for positively moving the operators hand back when the plunger descends. m

a. In a safety device, the combination with a reciprocating press head and plunger, of a flexible connection, means on the plunger for moving said flexible connection as the plunger moves, a shaft, an arm on said shaft connected with said flexible connection and adapted to beraised by it when the plunger descends, a pair of arms on said shaft extending upwardly therefrom and having means for supporting a transverse rod in any one of a plurality of positions, wherebysaid rod will be moved forward when the plunger descends, a strap adapted to be worn around the wrist of the operator, and a hooked plate extending down from the strap and adapted to engage the rod to provide for positively moving the operators hand back when the plunger descends.

5. As an article of manufacture, an attachment for a press safety device, a wrist strap having a plate provided with a transversely proiecting hook for the purpose described.

In testimony whereof I have hereunto aflixed my signature.

FRANK J. cannons.

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