US2280189A

US2280189A - Safety mechanism for nailing machines

Info

Publication number: US2280189A
Application number: US377877A
Authority: US
Inventors: John A Duran
Original assignee: United Shoe Machinery Corp
Current assignee: United Shoe Machinery Corp
Priority date: 1941-02-07
Filing date: 1941-02-07
Publication date: 1942-04-21
Anticipated expiration: 1959-04-21

Description

`April 21,1942. J. A. DURAN 2,280,189

SAFTY MECHANISM FOR NAILING MACHINES Filed Feb. 7, 1941 Patented Apr; 21,1942v SAFETY MECHANISM `Fort l MACHINES l NAILIN G John. Duran, BeverlyMass.`, assignor to United ShoeMachinery Corporation, Flemington, N.`J.,

a corporation of New Jersey .Application February 7,1941, serial No. 377,877

6 Claims. I

This invention relates to means for protecting `the operators of such nailing machines as those employed for attaching heels to shoes, from injury caused by the accidental starting of the machine in operation.`

In an apparatus of the character of that `disclosed in Letters Patent of the United States No.

1,157,688, Glidden, October 26, 1915, a hinged guard is placed in iront of the `reciprocatory nailing die and its co-operating drivers. When raised, this guard covers the"movable parts behind it, so'the operators hands cannot come in Contact with them.` VWhen lowered, access may be had to the die and drivers to allow them-to l beinspected orchanged. Careless operators may leavethe guarddown, or even entirely remove itbecause they feel it slows them in their work With the movable elements thus exposed,the starting treadle of the machine. may be depressed accidentally,"` causing said machine to go through an operating cycle.` The operator-s `hands might then be caught by the normally guarded moving parts, or hishead struck by the descending jack, forcedfdown for the application of preliminary pressure to the work. An object of this invention is to give the operator effective protection against' such accidents;

In the attainment of the above object, there is combined with nail-driving mechanism, as a die and co-operating' drivers, their shielding guard,

means by `whichthe driving mechanism is operated and a treadle or other controlling member for such means, locking members of which there may be two, one connected to the controlling member and the ,othermovable into and out of the path of the first and connected to the guard. This arrangement may be caused to prevent actuation of the treadle and the starting of the machine, when the movable parts are exposed, but will permit operation if these are covered. To render it diiiicult for the operator to take off the guard, and thus be completely deprived of its protection, I have furnished means for pre-f the associated elements to preventv ready separation.

The drawing illustrates a single embodiment of the invention, it showing my improved safety mechanism in broken side elevation.

Of the machine of the previously mentioned patent, there appears a frame I0, upon which are guided for vertical reciprocation a crosshead I2, carrying a die-block I4, and a crosshead 1I6, upon which` is mounted a plate having drivers I8 movable in nail-receiving passages in the die-block. From a power-shaft 20, the crossheads `I4 and IG are respectively `actuatedby connections in cluding toggle levers 22 and 24. In the connections to the crosshead I6, a cam-lever 26 is`ineluded, the movement of which is governed by a cycle.

cam-slot 28 formed in it and guided by a projection 3B from the frame, Power` is applied to the shaft 2E) through a single-`rotation clutch mecha` nism 32, which is tripped by depression of `a treadle 34, fulcrumed upon a spindle 36. Connected to the treadle by a link 38 is a locking bar 40, joined at its opposite extremity to the center of the toggle-lever 22.` When the treadle is depressed in the normal operation of the machine, the link 38 lifts a shoulder 42 upon the bar clear of a pin 44 projecting laterally from an arm 46 attached to the spindle 33, this allowing full depression ofthe treadle to initiate an operating As a protection `to the operator from the l power-actuated parts of the nailing mechanism,

there is hinged in front of these parts `upon a pin 48, lying in a horizontal bore in the frame,

venting disconnectionof the pivoted connections between the locking member andlguard,`w`hen l the elements are assembled. In the particular form ofthe invention herein disclosed, the

a guard 50. When this guard is raised to the position shown in full lines in the drawing, the

movab-le elements are completely shielded from contact with the operator, but it may be swung outwardly and downwardly to give full access to these elements. This relation `is indicated in dotted lines.

Considering now what is peculiar to the present invention, a boss 52 projects from the guard 50 and xed in the boss at one side of the axis and parallel thereto, is a pivot-pin 54. This pivot-pin is joined by a link 56 to a pivot-pin 58 lying in a recess at oneside of a stoparm`60 mounted to swing about the frame-projection 30. When the guard 50 is in its raised relation, a transversely extended surface 62 upon the lower end yof the arm 60 lies clear of an upward projection 64 from the stop-bar. It will be seen that under these conditions, upon elevation of the locking bar 4l] with its projection 64 by depression ofthe treadle 34, said bar will be free for movement, so the clutch 32 may be tripped to TENT OFFICE start the machine in operation. When, however, the guard is lowered, the pin 54, which is in effect a crank-pin, rotates clockwise, drawing the link 56 to the right. This similarly swings the arm 60 until its surface 62 is just above the top of the projection 64. If there is occasion to remove the guard, excessive movement of the arm in this direction is limited by a shoulder 66 upon the arm. The relation of the elements for the lowered position of the guard is as illustrated in dotted lines in the drawing. Now, if an attempt is made to treadle the machine, the bar 40 cannot rise, so it is impossible to release the clutch for driving engagement. Thus, the operator is positively protected from injury by moving parts of the machine, whether these be in the rising die mechanism and driver mechanism, or the unillustrated descending jack mechanism. To make it hard for the operator to uncouple the safety connections while the associated elements are in place, the pivot-pin 54 is driven into the boss 52 and the adjacent end of the link 56 lies in a circumferential groove formed between a head l upon the hinge-pin 48 of the guard 58 and the outer surface of the boss, the hinge-pin being secured tothe boss at 12. The opposite extremity of the link and the pivot-pin 58 are similarly situated between the cam-lever 28 and the arm 60. The retaining nut 'i4 of the cam-lever 26 may also be pinned at 76 to the frame-projection 30. The diculty involved in disconnection will usually prevent the operator from tampering with the safety mechanism.

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

l. In a nailing machine, nail-driving mechanism, a guard movable to shield or give access to said mechanism, operating means for the driving mechanism, a movable controlling member for the operating means, a locking member connected to the controlling member, and a second locking member movable into and out of the path of the rst locking member and connected to the guard.

2. In a nailing machine, a nailing die, naildrivers co-operating therewith, the work-engaging portions of said die and drivers being at all times free for the association with and removal of work therefrom, a guard movable to either shield or give access to the die and drivers below their work-engaging portions, operating means for the drivers, a movable controlling member for the operating means, and means movable under the influence of the guard to lock the controlling member against movement or to release it for actuation.

3. In a nailing machine, nail-driving mechanism, a guard pivotally mounted to be swung between the operator and the nailing mechanism or lowered to give access to said mechanism, operating means for the nailing mechanism, a movable controlling member for the operating means, and locking means for the controlling member, said means including a locking member and a connecting member pivoted to the locking f' member and to the guard, there being means for preventing the manual disconnection of the connecting member at its pivots while the associated elements are assembled,

4. In a heel-attaching machine, a frame, a nailing die and reciprocatory drivers mounted upon the frame, a guard pivoted upon the frame and lying normally in front of the die and drivers below the point of application of work thereto, operating means for the drivers, treadle mechanisrn by which the operating means is controlled, and a locking member for the treadle mechanism pivoted upon the frame and connected to the guard.

5. In a heel-attaching machine, a frame, nailing mechanism including a die and reciprocatory drivers movable upon the frame, a guard pivoted upon the frame in front of the die and drivers, operating means for the drivers, a treadle by which the operating means is controlled, a locking bar movable by the treadle and nailing mechanism, an arm pivoted upon the frame and movable into and out of bar-retaining relation, and a link joining the arm to the guard.

6. In a heel-attaching machine, a frame, a nailing die and reciprocatory drivers mounted upon the frame, a guard pivoted upon the frame in front of the die and drivers, operating means for the drivers, a treadle by which the operating means is controlled, a locking bar co-operating with the treadle, an arm pivoted upon the frame and movable into and out of bar-retaining relation, and a link pivotally connected to the arm and guard, the ends of the link at the pivots being covered and rendered inaccessible by the associated elements to prevent separation.

JOHN A. DURAN.