US3703821A - Safety lock - Google Patents

Abstract

The invention relates to a safety lock provided with a number of apertures capable of receiving individual workmen''s padlocks and controlled by a master key so that the workman may work on a machine in the sure knowledge that the power cannot be switched on inadvertently by another workman.

Description

United States Patent Dorey 1 Nov. 28, 1972 [54] SAFETY LOCK [56] References Cited [72] Inventor: Albin E. Dorey, P.O. Box 727, H UNI 1 E PATN 1 S V Esterhazy, Saskatchewan, Canada 1,934,319 11/1933 Newbauer ..70/57 [22] Filed: May 20, 1971 pp 145,151 Primary Examiner.loseph H. McGlynn Attorney-Thomas M. Marshall [30] Foreign Application Priority Data May 27, 1970 Canada ..083,839 [57] ABSTRACT The invention reiates to a safety lock provided with a ..70/38 Eggs/131667.22 number f apertures capable f receiving individual 58 Field of Sea I. 76152-54, 337, s padhcks and by a master key 70/339, DIG. 63, 38, 41

that the workman may work on a machine in the sure a knowledge that the power cannot be switched on inadvertently by another workman.

PATENTED I973 3,703,821

SHEET 1 OF 2 FIG.1

l N VE N TOR A la/1v E. 0025/ PAIENTEnmm I 12 3,703,821

SHEET 2 [IF 2 FIG. 2

INVENTOR AL BIN f. 00RY ATTORNE SAFETY LOCK This invention relates to safety locks. Machine shops, plants, etc. often require various machines to be serviced or repaired. Such servicing is accomplished by different tradesmen, depending upon the type of servicing required, i.e. mechanics, electricians, refrigerating engineers, plumbers, etc. However, it is essential, when such a tradesmen is working on a machine, to ensure that the power is not switched on by somebody else. For instance, two different tradesmen, e.g., a mechanic and an electrician, may both be working simultaneously on the same machine. In consequence, lock-out arrangements have been known for some time. I

A lock-out arrangement generally resides in the provision of a so-called safety lock, which can be used in conjunction with the power switch to the machine, and which lock is provided with a number of holes each capable of receiving a padlock insertable thereinto and under the control and key of a particular mechanic. With such lock-out arrangements, there has always been the possibility that one of the tradesman will forget to use his padlock whereupon the other tradesman may remove his padlock and switch on the machine, thinking that he is the only person working on the machine.

Hence, it is the object of the present invention to provide a lock-out device which will permit the use of individual padlocks by tradesmen and yet which will be under the ultimate control of a supervisor.

Accordingly, the present invention relates to a lockout device including a lock body; a hasp pivotally and slidably connected to said body and capable of being retained in locked operative position with said body; a first wing secured to said body; a secondwing secured to said hasp; and corresponding apertures formed in said wings adapted to receive individual padlocks when said apertures and wings are aligned with one another and the hasp is in said operative position.

The invention is illustrated in the accompanying drawings in which:

FIG. 1 is a perspective view of the lock-out device in v an inoperative condition; and

FIG. 2 is a view similar to FIG[ I but showing the device in an operative condition.

Referring to the drawing, the lock-out device includes a lock body 1 containing a lock (not shown) operable through a keyway (also not shown). The body 1 is provided with a pivotable and longitudinally slidable elongated U-shaped hasp indicated generally at 2 and, as shown in FIG. 1, one limb 3 of the hasp is capable of being disengaged from the usual passageway 4 in which it is normally accommodated when the hasp is in an operative condition.

Welded to one side of the lock body 1, or integral therewith, is a first lock-out wing 5 provided with an aperture 6 and a plurality of further apertures 7.

Welded to the remaining limb 8 of the hasp 2, or integral therewith, is a second lock-out wing 9, the overall length of which is less than the overall length of first wing 5, and which is provided with a plurality of apertures 7 (see FIG. 1

In use, the lock-out device normally hangs from the main power switch to the machine by means of a chain (not shown) passing through aperture 6. When it is desired to lock-out the machine for the purpose of maintenance or repair, the operator, shop foreman or superintendent opens the main power switch and places the hasp through the usualhole provided on such switches and then locks the hasp to the body 1 in known manner. Such action enables the two wings 5 and 9 to be aligned with one another, as are the apertures 7 and 7 If, say an electrician then wishes to work on the machine, he would place his padlock through a pair of aligned apertures 7, 7'. If, simultaneously, a plumber wished to work on the same machine, he would place his own padlock through a pair of similar and aligned apertures 7, 7'.

Each workman is then able to repair the machine knowing that the ultimate responsibility of the lock-out resides with the shop foreman or operator..As each mechanic finishes his particular job, he reports to the operator, shop foreman or superintendent before removing his padlock from the lock-out device. When the final mechanic has reported, the superintendent or operator then checks the device to satisfy himself that all padlocks have been removed and then unlocks the device with his master key thereby permitting said power switch to be moved to its operative ON position.

If desired, aperture 6 can be utilized for the hanging of the workmens padlocks, provided with stamped serial numbers thereon, when not in use.

Although a preferred embodiment of the safety lock of the present invention has been described hereinabove and illustrated in the drawings, modifications and equivalents thereof will be readily apparent to those skilled in the art.

What is claimed is:

1. A lock-out device including a lock body; a hasp pivotally and slidably connected to said body and capable of being retained in locked operative positionwith said body; a first wing secured to said body; a second wing secured to said hasp; and corresponding apertures formed in said wings adapted to receive individual padlocks when said apertures and wings are aligned with one another and the hasp is in said operative position.

2. A lock-out device according to claim 1 including latch means within said body and cooperating with said hasp to retain the latter in its locked position, said latch means being controllable by a key.

3. A safety lock-out device comprising:

a lock including a body and a hasp pivotally and slidably connected to said body and capable of being retained in locked operative position with said body;

a first wing member secured to said body and including at least one aperture; and

a second wing member secured to said hasp and including at least one aperture, said apertures being aligned when the hasp is in operative locked position with said body whereby an individual padlock may be received within said aligned apertures thereby preventing the hasp from being moved to the unlocked inoperative position with said body.

4. A safety lock out device according to claim 3 including latch means within said body, said latch means cooperating with said hasp to retain the latter in its locked position, said latch means being controllable by a key.

5. A safety lock-out device as in claim 3 wherein said first and second wings each include a plurality of apertures.

6. A safety lock-out device as in claim 3 wherein the hasp is U-shaped, with the second wing being con- 5 nected to one leg of said U-shaped hasp.

Claims (6)

1. A lock-out device including a lock body; a hasp pivotally and slidably connected to said body and capable of being retained in locked operative position with said body; a first wing secured to said body; a second wing secured to said hasp; and corresponding apertures formed in said wings adapted to receive individual padlocks when said apertures and wings are aligned with one another and the hasp is in said operative position.

2. A lock-out device according to claim 1 including latch means within said body and cooperating with said hasp to retain the latter in its locked position, said latch means being controllable by a key.

3. A safety lock-out device comprising: a lock including a body and a hasp pivotally and slidably connected to said body and capable of being retained in locked operative position with said body; a first wing member secured to said body and including at least one aperture; and a second wing member secured to said hasp and including at least one aperture, said apertures being aligned when the hasp is in operative locked position with said body whereby an individual padlock may be received within said aligned apertures thereby preventing the hasp from being moved to the unlocked inoperative position with said body.

4. A safety lock-out device according to claim 3 including latch means within said body, said latch means cooperating with said hasp to retain the latter in its locked position, said latch means being controllable by a key.

5. A safety lock-out device as in claim 3 wherein said first and second wings each include a plurality of apertures.

6. A safety lock-out device as in claim 3 wherein the hasp is U-shaped, with the second wing being connected to one leg of said U-shaped hasp.

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