US1257444A - Safety manipulating device for machinery. - Google Patents

Description

R.1.ALDR!CH. SAFETY MANIPULATING DEVICE'FORl MACHINERY.

APPLICATIONl FILED APR. l0, 1913*.

Patented Feb. 26, 1918.

ginvrinn sraTEs PATE FFEC .I

RALPH J'. ALDRICH, 0F CHICAGO, ILLINOIS, SSIG'NOR T0 BENJAMIN ELECTRIC MFG. COMPANY SAFETY MANIPULATING- DEVIC FOR MACHINERY.

Applicationled April 10, 1913.

To all lwhom t may concern.'

Be it known that I, RALPH J. ALDRICH, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented new and useful Im* provements in Safety Manipulating' Devices for Machinery, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawing, forming a part of this specification.

My invention pertains to vsafety manipulating devices for machinery, that is, to devices for insuring safety to the operator in running machines which have to be intermittingly operated, as, for instance, in the case of punch presses; and the invention relates especially to that class of safety manipulating device (disclosed, for instance, by Pat. No. 1,046,374 granted Dec. 3rd, 1912, to R. B. Benjamin) in which two members are employed both of which must be operated before the desired eect upon the machinery can be produced. When, as is the most usual arrangement, the two members are hand levers, and the desired e'ect upon the machinery is the tripping of the clutch of a punch press, it'will be seen that the necessity of operating both hand levers before the press clutch can be tripped, effectually prevents the presence of the hands near the press head when the latter descends. Accidents to the operator are thus avoided. lt is the object of this invention to improve upon safet manipulating devices of the character escribe'd above, by producing a simple and durable device which will be more convenient in use than has been the case in prior devices.

A safety manipulating device constructed in accordance with my invention, as employed in connection with a punch press, is described, by way of example, in the following specification and shown in the accompanying drawing, in which:

Figure l is an elevation of a punch press equipped with a safety manipulating device, constructed in accordance with my inven tion- Fig. 2 is a section of the press on the line 2 2 of Fig. l, disclosing a top view of the safety device;

Fig. 3 is a section on the line 3-3 of Fig. 1, showing a detail of the device; and

Fig. 4 is a section on the line 4 4 of Fig. 1, showingr another detail.

Specication of Letters Patent.

Fatented Feb. 26, 1918..

serial No. 760,304. i

This lever extends in a general horizontal direction to the forward end of the machine. On the end of shaft projecting from the other side of the frame is mounted a bell crank lever 16 having a boss 17 surrounding and rmly secured to the shaft by a set screw 18. Any angular movement of the lever 15 therefore causes a like movement of the bell crank 16. i

Adjacent the boss 17 of the bell crank lever 16 is a hand lever- 19 which is loosely mounted on the shaft 12 and is retained thereon by a collar 2O secured to the shaft by a set screw 21. Integral with the hand lever 19 is an inclined extension 22 similar in lenth, shape and direction .to the rear arm 23 of the bell crank lever 16. rlhe eX- tension 22 and the arm 23 have, passing through them at their outer ends, in a substantially perpendicular direction thereto, stems 24 and 25 respectively. These stems carry coiled compression springs 26 and 27 interposed between the arm 23 and extension 22 and nuts 28 and 29 on the ends of the stems. The other ends of the stems are pivotally secured to the machine frame by means of a casting 30 bolted to the frame, having a lug 31 as a part thereof, and a pin 32 held in this lug and passing through eyes 33 and 311 formed in the stems. These. parts provide a construction whereby the hand lever 19, the bell crank lever 16 and through it the hand lever 15, are raised and maintained in that position by the action of the springs and resist any downward pressure upon the levers.

` The other arm, 25, of the bell crank lever 16 extends in the same horizontal direction as the loosely mounted hand lever 19, and their upper surfaces lie in the same plane. The arm 35 of the bell crank lever, however, does not extend to the forward end ofthe machine, but only far enough to give an ample bearing surface to a stopv 36, extending in a horizontal crosswise direction and connecting with it. This stop also presses on the upper surface of the hand lever 19. Itis adjustably secured ony a clutch operating rod 37 which presses between the bell crank lever arm and the hand lever. The upper end of this rod controls a clutch and the lower end is guided in an opening of a lug 38 extending from the casting 30 above mentioned. A compression spring 39 is mounted belly crank arm 35 topress upward on theclutch rod stop 36. Therefore, the rod is held in a raised position, unless external pressure is exerted upon the hand lever 19 and the crank arm 35 through its attached hand lever 15, to force them downward and overcome the action of their springs. As either one of these springs is stronger than the clutch rod spring, the action of both must be overcome to allow the clutch spring to act and draw the rod downward.

It will be noted that as the hand lever 19 is only loosely mounted in the shaft 12, any movement of the lever 15 will not be communicated to it; nor will any movement of the lever 15 cause a movement of the lever 19. Both the lever 19 and the lever 15, through the bell crank lever movable with it, press upwardly on the stop of the clutch rod on account of the action of their springs, consequently, depression of one lever only will leave the other lever in raised position and contacting with the stop on the rod; and, as each lever supporting spring is stronger than the rod depressing spring, depression of both levers is necessary to pera downward movement of the clutch The clutch is of that type where a downward pull on the operating rod connects the driving shaft with the driver and so puts the machine in operation. Therefore, when the hand levers are depressed, releasing the upward pressure on the stop on the rod, the rod spring will draw the rod downward, putting the machine into operation. As soon, however, as pressure on the hand levers, or either one of them, is removed, the lever springs raise them into engagement with the rod stop and further lift them and the rod stop, and consequently the rod, and so stop the machine.

It will be noted that it is immaterial whether the lever 15 or the lever 19 is depressed irst, or whether both levers are depressed together, in order to actuate the rod 37 and trip the clutch. This renders the device convenient of operatifn. The device consists of relatively few parts and there is nothing which is liable to get out of order under the ordinary conditions of use.

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

1. A safety manipulating device for machinery comprising, in combination, a clutch tripping member, means normally tending to actuate said member and a pair of operable devices each of which is adapted normally to prevent the actuation of said meniber and said devices being adapted to permit the actuation of said tripping member when both are operated, said devices being spaced apart, for the purposes set forth, the construction being such that when both said devices are operated said actuating means will automatically actuate the clutch-tripping member. Y 2. The combination with a punch press, of a clutch tripping device therefor having a normal tendency to trip the clutch, means for restraining said devlce in its non-tripping position comprising a pair of operable members each normally retaining said tripping device in its non-operable position, said device being permitted to move to its operable position only when both of said members are operated, the construction being such that when both of said members are operated said clutch-tripping device will automatically act to trip the clutch.

3. The combination with a punch press having a clutch-tripping device associated therewith, said clutch-tripping device comprising a tripping member, a spring normally tending to actuate said tripping member, and a pair of movable hand levers, one at each side of the machine, each of said hand levers being provided with a spring of greater strength than said first-named spring, tending to prevent the actuation of said tripping member.

Il. In combination, a punch press, a springpressed member, adapted, when moved by its spring, to actuate the clutch of the press, a pair of manually operable members each engaging said spring-pressed member, and a spring for each of said manually operable members, each of said springs being stronger than the spring of said clutch-tripping member, whereby movement of said clutch-tripping member is prevented unless both of said manually operable members are operate 5. In combination, a punch press, a clutchtripping rod having an abutment thereon, means normally tending to move said rod to trip the clutch, and a pair of manually operable devices engaging against said abutment and each preventing movement of said rod unless both are operated, the construc tion being such that when both said manually operable ydevices are operated said rodmoving means Will automatically move the rod to trip the clutch.

6. The combination with a machine having a part movable in a definite path, of driving means therefor, means for connecting and disconnecting said movable part from said driving means, means tending to hold said connecting and disconnecting means in connecting position, and a plurality of independently movable means tending to hold said connecting and disconnect.- ing means in disconnecting position, the construction being such that When said pluact to rality of independently movable means are moved said means tending to hold the connecting and disconnecting means in connecting position Will automatically act to connect the driving means with the movable parts.

In Witness whereof, I have hereunto subscribed my name in the presence of two Witnesses.

' RALPH J. ALDRICH. Witnesses:

CHARLES G. Corn, T. L. TOBIAS.

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