US1116061A - Safety device for machines. - Google Patents

Description

G. HEAR. i SAFETY DEVICE FOR MAGHINES.

APPLIQATION FILED AUG. 8. 1913.

1,1 1 6,061 I Patented Nov. 3, 1914 2 SHEETS-SHBET 1.

WEE/2145565: I I22 wena QQ G. HBAP.

SAFETY DEVICE FOR MACHINES.

APPLICATION FILED AUG. 8 1913.'

' Patented N 0v. 3, 1914.

h 2 SHEETS-SHEET 2.

w'izzasse [5276226 021 GEORGE nnAr, or

CLEVELAND, OHIO.

SAFETY DEVICE FOR MACHINES.

iiiaoei.

Application filed August 8, 191-3. Serial No. 733,727.

Specification of Letters Patent.

Patented Nov. 3, 1914.

To all LU/1017b it may concern Be it known that I, Gannon HEAP, a subject of the King of Great Britain and Ireland, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented a certain new and useful Improvement in Safety Devices for Machines, of which the following is a full, clear, and exact desciiption, reference being had to the accompanying drawings.

This invention is for a safety device to be used in .connection with machines which are dangerous to the hands of the operator because the article to be acted upon must be held by the hands near to mechanism in which they are liable to be injured;

The principal object is to prevent running the machine while the operators hands are too near the danger zone. This is accomplis'hed by providing a pair of'latches which prevent the shifting of a clutch into driving position, except when each hand is resting on controlling mechanism, insuring them being out of the danger zone when'the machine is started.

. As shown in the accompanying drawings, my device is applied to a press for setting the 'ends on pasteboard boxes.

This invention is hereinafter more fully described and the essential characteristics are set fort-h in the claims.

In thedrawings, Figure 1 is a front eleva-' tion of an end setting machine showing my device as applied thereto; Fig. 2 is a side elevation of the same; Fig. 3 is a plan of the lever mechanism for operating the clutch with the foot; Fig. 4 is a sectional detail of the mechanism for holding the hand operating lever, being a section taken on the line 44 of Fig. 1.

The side members ofthe press shown are designated 5 and 6 and are mounted upon a base 7 and support a cross member 8 extending across the top-of the press and forming an abutment for the head 9 of the ram 10. This ram 10 is adapted to be-raised by mech anism, not shown, when the shaft 12 is rotated by the engagement of aclutch member 14 with theclutch member 15, rigid with a driving pulley 16. The cross head 8 is shown as yieldingly held to the frame members 5 and 6 by means of springs 18 surrounding suit able studs and adjustably compressed by means of nuts 19 threaded onto the studs. This is to prevent the breaking of any of the operating parts when too great a thickness comes between the cross head S'and the head 9. I

The clutch member 14 in the press shown is adapted to be shiftedby a bifurcated arm of a bell crank 20 pivoted at :21, having its other leg 22 engaging an arm of a foot lever 24 pivoted at 25 to the base 7 of the machine. lVhen the foot lever 24 is depressed, the arm 22 is raised and the other leg of the bell crank moves the clutch member 14 into engagement with the clutch member 15, thus starting the machine.

The foregoing is a brief description of a press with which my device may be used, but it is to be understood that the same is simply illustrative of any suitable power invention will now be fully described. Rigidly secured to the membersQG forming a bifurcated portion of the bell crank der 29 are two latches 30 and 31 pivoted 32 to a suitable bracket 33 carried on the side member 6 of the machine. These latches are in the form of hooks, so shaped that either of them will prevent the movement of the clutch member 14 by reason of their engagement with the shoulder 29, except when both are raised. To allow the shoulder to pass freely under the books on the return movement of the clutch member, the r are beveled, as at 34, to. present a cam. sur face to the shoulder. The return of this clutch member is caused by the action of a tension spring 35 secured to the frame member 6 and to the bell crank member 20.

Suitably journaled in bearings 3,6 mounted on the sides of the frame members and 6 are rock shafts 37 and 38. The rock shaft 38 has a rigid rock arm 40. to which is tached a chain 41 leading downw rdly to the book 30 to which it is suitably attached. A similar rock arm 43 is rigidly mounted on the rock shaft 37 and is connected by a chain 44 to the other hook 01. the chain passing intermediately over a pulley 45 loose on the shaft 38. It results from this cor struction, that, when the rock shaft is out of engagement with the shoulder 29, and, when the rock arm 48 is moved outwardly, by the rotation of the rock shaft 38, the other latch will be raised out of engagement with the shoulder 29 by means machine. The attachment constituting my 20 is a yoke 28 having thereon a transverse shoulder 29. Normally engaging this snout-- turned to move the arm. 4.0 upwardly, the latch connected to the chain 41. willbe raised of the chain st. In order to rock these rock shafts to raise the hooks and 31, and allow the clutch member to'be thrown into action only when the operators hands are out of danger, I provide levers i8 rigidly carried on the forward end .of these rock shafts 37 and 38. These levers extend to-- ward the center of the machine adjacent the head 9 of the ram 10. but enough below it, so that when the wrists or hands of the operator are depressing them by resting upon them, the hands will be entirely out of danger of getting between the head 9 and the cross head 8, where they could be crushed. The inner ends of these levers d8 are preferably provided with suitable pads 19 to prevent discomfort when the hands are resting on them. Each lever 48 is adjustably carried by a block 50 rigidly secured to the end of the respective rock shaft 3'7 or 38 and clamped thereon by means of an eyebolt 51, through which the lever 48 passes. These eye-bolts, as shown, pass through the blocks 50 and act todraw the lever-s 4:8 down against suitable ledges 53 under the influence of a thumb nut This is to provide for lateral adjustment of these levers to aecommodate different sized pieces of work In the operation of this machine, a portion of a box, indicated by broken lines at 56, is

held by the operator around the head 9, and an end or other portion of the box is moved between the head 9 and the head 8. This latter portion of the box having glue on its edges, is secured to the other portion of the box by the upward pressure of the head 9. Now, it will be seen that the operators hands are down at the sides of the box portion being held by the hand, that the wrist may depress the levers 48 by being in the position shown in Fig.2. Thus the hooks controlling the movable clutch member may be raised only when. both of these members are depressed, insuring both hands being in a safe position.

Having thus described by invention, what I claim is:

l. The combination with mechanism liable to injure the hands of the operator, of devices located adjacent said inechanisnr and adapted to control the starting thereof, said devices being adapted to be engagedby portions of the operators arms while he is per-' forminghis regular work on the machine and permitting the starting only when his hands are in safety position.

The combination, with mechanism liable to injure the operators hands, of a foot controlled clutch, a latch for preventing the movement of said clutch, and means eontrolling said latch located a safe distance away from the dangerous mechanism and adapted to be moved by the operators wrists when the hands are in working position to permit the movement of said clutch and starting of the mechanism.

3. The combination, with a machine liable to injure the operator, of a pair of rock shafts, means operated thereby for preventing the operation of the machine, and a pair of rods adjustably mounted on the rock shafts and projecting into the' position for .engagementibythe wrists of the operator while his hands are working but in safety position. v

4. The combination, with a press having a movable head and an abutment block, of means for moving said movable head, a clutch for controlling said means, latches for preventing the operation of the clutch, devices located adjacent to the movable head adapted to control said latches, connections between the latches and said devices, said devices being movable by'the operator while holding a blank to be operated upon to permit the movement of the clutch only when the operators members are in safety position.

5. The combination, witha press having an abutment block and a movable head, of

means for controlling the-movable head comprising a slidable clutch operated by a foot lever, latches controlling the movement of said clutch, rock shafts carried by the press, rock arms on the rock shafts, flexible connections between said latches and said rock shafts, and levers carried by the rock shaft extending to a point adjacent the movable head, whereby the rock shafts may be moved to release the clutch when the operators hands are in safe position.

6. The combination, with a press having an abutment-block and a movable head, of means for controlling the movable head comprising a slidable clutch operated by a foot lever, latches controlling the movement of said clutch, rock shafts carried by the press,

connections between said latches and said rock shafts, and rods adjustably mounted in clamps carried by the rock shafts and eX- tending to points adjacent the movable head on each side thereof, whereby the rock shafts may 'be moved to release the clutch by the operator s' forearms while his hands are at work, provided his hands are in asafe position.

In testimony whereof, I hereunto aiiix my signature in the presence of two witnesses. GEORGE HEAR Witnesses:

ALBERT H. Barns, BRENNAN B. VVEs'r.

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