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Publication numberUS2560624 A
Publication typeGrant
Publication dateJul 17, 1951
Filing dateFeb 4, 1948
Priority dateFeb 4, 1948
Publication numberUS 2560624 A, US 2560624A, US-A-2560624, US2560624 A, US2560624A
InventorsDiestelbrink Bartlett William
Original AssigneeCelanese Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Lock sling
US 2560624 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

Jufiy B7, 1951 w. D. BARTLETT LOCK SLING Filed Feb. 4, 1948 INVENTOR.


ATTORNEYS Patented July 17, 1951 LOCK SLING William Diestelbrink Bartlett, Cumberland, Md., assignor to Celanese Corporation of America, a

corporation of Delaware Application February 4, 1948, Serial No. 6,220

1 Claim. 1

This invention relates to lock slings, and relates more particularly to a novel lock sling adapted for use in sealing certain elements against undesirable or unauthorized use.

It is often desirable, and sometimes even necessary to prevent serious accidents, to lock certain elements, such as electrical switches, valves, machine parts, etc., to prevent the same from being opened or placed in operation prematurely, or by unauthorized persons.

It is an object of this invention to provide a simple, inexpensive and effective lock sling adapted for use in sealing electrical switches, valves, machine parts, etc. against undesirable or unauthorized use.

Other objects of this invention, together with certain details of construction and combinations of parts, will appear from the following detailed description.

In the accompanying drawing,

Fig. 1 is a perspective view of the novel lock sling of this invention in closed or operative arrangement, and

Fig. 2 is perspective view of the lock sling in open position.

Like numerals indicate like parts throughout both views of the drawing.

Referring to the drawing for a detailed description of the lock sling of this invention, it will be seen that the lock sling consists of two substan tially similar members 3 and 4 each comprising a fiat, relatively narrow bar, which may be of any suitable material, such as iron, steel, brass, etc. One end of each bar is formed into a hook 5, 6 while the major portion of the shank of each bar is provided with an elongated slot 1, 8. To form the lock sling, the two bars 3 and 4 are pivotally mounted, at a point just below the hooked ends, on a pin 9 by which they are held together. In mounting the two bars 3 and 4, they are arranged so that the hooks face each other in a sort of sister-hook arrangement. By this arrange ment, the hooks, when the bars are brought together as shown in Fig. 1, form a substantially circular opening I l which surrounds the element to be sealed.

After locating the hooks 5 and 6 about the equipment, it is desired to seal, the hooks are brought together by the movement of bars toward each other until they overlap and the slots 1 and 8 are in register. The bars 3 and 4 may then be held in closed or operative position by passing a lock through slots 1 and 8. As shown in the drawing, the ends of the hooks 5 and 6 will overlap before any portion of the slots 1 and 8 come into overlapping position so that it is impossible to pass a look through said slots before the hooks have firmly engaged th equipment it is desired to seal. A plurality of locks may be employed, depending upon the number of men working and/or the type of work being carried out on a particular job.

The present invention is applicable where different types of work, such as welding, pipe fitting, rigging, etc., are being done on the same line. The present lock sling can be used to seal the control valve, for example, and th several workers involved on the particular job each will have his own lock on the sling. To open the valve, therefore, the lock sling must be cleared of all looks. Accordingly, the present invention furnishes a foolproof safety device for preventing premature opening of valves controlling steam and flammable and poisonous materials, and of switches controlling flow of electricity and the starting up of machines. It also prevents the placing of chemical systems in operation prematurely, thus avoiding the loss of valuable materials.

It is to be understood that the foregoing detailed description is given merely by way of illustration and that many variations may be made therein without departing from the spirit of my invention.

Having described my invention, what I desire to secure by Letters Patent is:

A look sling comprising a pair of pivotally connected, relatively movable identical bars each having an opening in the shank thereof running substantially the full length of said shank and a hook at the end of each bar, the concave portion of said hooks facing each other and being spaced apart in the open position and overlapping each other in the closed position to form an opening, and the slots being coextensive with each other in the closed position to receive at least one look for the purpose of maintaining the bars in the closed position, said hooks extending toward each other sufficiently so that the ends of the hooks overlap each other before any portion of the slots come into overlapping position.


REFERENCES CITED The following references are of record in the file of this patent:

' UNITED STATES PATENTS Number Name Date 1,136,735 Taylor Apr. 20, 1915 1,197,020 Farrar Sept. 5, 1916 1,439,111 Laney Dec. 19, 1922 FOREIGN PATENTS Number Country Date 489,155 Great Britain July 20, 1938

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1136735 *Dec 26, 1914Apr 20, 1915Charles G TaylorLock.
US1197020 *Jan 6, 1916Sep 5, 1916Asa FarrarSafety attachment for switch-stands.
US1439111 *Sep 6, 1921Dec 19, 1922Archie F LaneyClutch-pedal lock for autovehicles
GB489155A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3667259 *Aug 5, 1970Jun 6, 1972Eng Dev Co IncSafety lock
US4085599 *May 23, 1977Apr 25, 1978Square D CompanyPadlock adapter assembly
US4732018 *Nov 6, 1986Mar 22, 1988Crosby Lyndon AAir coupling locking device
US4864834 *Mar 8, 1989Sep 12, 1989Ronald WaiteSafety lock
US5432308 *Aug 10, 1994Jul 11, 1995Howie, Jr.; Robert K.Lockout strip for an electrical switch
US5467622 *Apr 29, 1994Nov 21, 1995Eaton CorporationHandle lock for reciprocally movable operator handle
US5582042 *Mar 3, 1995Dec 10, 1996Federal-Hoffman, Inc.Safety double lock
US5881582 *Aug 27, 1997Mar 16, 1999Panduit Corp.Multi-purpose lockout
US7581420 *Jun 13, 2006Sep 1, 2009Master Lock Company LlcLockout device
US7640772 *May 12, 2007Jan 5, 2010James JohnsonWatersports apparatus locking device
US7870767Jun 1, 2007Jan 18, 2011Master Lock Company LlcLockout device
US8347671Nov 15, 2010Jan 8, 2013Master Lock Company LlcLockout device
US8353182 *May 18, 2011Jan 15, 2013Assa Abloy Australia Pty LimitedSafety lockout hasp
US8839649 *Mar 7, 2013Sep 23, 2014Master Lock Company LlcLockout device
US20110283753 *May 18, 2011Nov 24, 2011Assa Abloy Australia Pty LimitedSafety lockout hasp
EP0340894A1 *Mar 7, 1989Nov 8, 1989Nash Motors LimitedSpacer for holding an openable member in an open position
U.S. Classification70/14, 70/19, 70/57, 70/203
International ClassificationE05B67/00, E05B67/38
Cooperative ClassificationE05B67/383
European ClassificationE05B67/38B