US3695657A - Slide lock - Google Patents

Abstract

A cast having one or more mounting holes through which a screw may be passed for mounting the casting on a jamb. A pair of upstanding ears are formed with coaxial apertures therein for axial movement of a sliding bar therethrough. The bar is provided with a machined intermediate section which may be positioned between the upstanding ears so that the shackle of a padlock may be positioned about the machined portion to prevent the bar from being withdrawn. Each ear is provided with a threaded bore which receives a screw or bolt so as to control the distance which the bar may be moved by abutting shoulders formed on the bar at its opposite limits of travel. Adjacent one side of the machined portion, and intermediate the shoulders, a cam surface is formed which may be moved past the screw when the lowest portion of the cam is aligned therewith. When the bar is rotated about its axis, the cam surface and the screw will enter into contact to prevent inadvertent axial movement or slippage of the bar. A center punch is formed on the leading end of the bar to aid in locating the centers of bores which must be drilled in a closure member which is locked against movement when the bar extends into such bores.

Description

United States Patent Rosen 1 Oct. 3, 1972 SLIDE LOCK [72] Inventor: Ruth Rosen, Marina del Rey, Calif.

[73] Assignee: Automatic Packaging Machinery Co., El Segundo, Calif.

22 Filed: April 27, 1970 [21] Appl. No.: 32,079

[52] U.S. Cl. ..292/57, 292/148, 292/ 149, 292/DIG. 53 [51] Int. Cl ..E05c 1/04 [58] Field of Search....292/57, 58, 62, 147, 148, 149, 292/175, DIG. 53, DIG. 55; 70/DIG. 57, 466

Primary Examiner-Albert G. Craig, Jr. Att0rneySmyth, Roston & Pavitt [57] ABSTRACT A cast having one or more mounting holes through which a screw may be passed for mounting the casting on a jamb. A pair of upstanding ears are formed with coaxial apertures therein for axial movement of a sliding bar therethrough. The bar is provided with a machined intermediate section which may be positioned between the upstanding ears so that the shackle of a padlock may be positioned about the machined portion to prevent the bar from being withdrawn. Each ear is provided with a threaded bore which receives a screw or bolt so as to control the distance which the bar may be moved by abutting shoulders formed on the bar at its opposite limits of travel. Adjacent one side of the machined portion, and intermediate the shoulders, a cam surface is formed which may be moved past the screw when the lowest portion of the cam is aligned therewith. When the bar is rotated about its axis, the cam surface and the screw will enter into contact to prevent inadvertent axial movement or slippage of the bar. A center punch is formed on the leading end of the bar to aid in locating the centers of bores which must be drilled in a closure member which is locked against movement when the bar extends into such bores.

11 Claims, 3 Drawing Figures SLIDE LOCK BACKGROUND OF THE INVENTION In modern architectural techniques, houses and other buildings are provided with a maximum amount of windows and other light-admitting devices. Further, modern living habits have given rise to the requirement for houses which are well-suited to indoor-outdoor living which is afforded by sliding glass doors. These occurrences have resulted in a large number of structures being built with such doors which may be easily opened so that people and air can easily pass into and out of the interior. Additionally, many other types of closure devices are in frequent well-known use such as large windows, marine hatches, etc.

Unfortunately, the extended use of these devices has also increased the vulnerability of such buildings or structures to illegal and/or undesired entry by humans and other animals. Many of these closure devices are susceptible to being quickly and easily jimmied open and, in fact, cannot be locked against being opened unless they are in the fully closed position. In other words, the closure cannot be left even partially opened for the passage of air without creating the danger of unauthorized entry unless some other type of locking device is provided.

These problems have lead to the creation of a wide variety of locking devices which will prevent the closure from being jimmied open whether they are fully closed or partly opened.

Some of the locking devices of this type have proven to be relatively inexpensive and to embody a variety of spring and/or thread systems. For example, devices have been provided which basically comprise rods which are mounted between the door jamb and the rear end of a slidable door or window panel. Often, such rods may be adjusted to a variety of positions so that the panel may be locked in the fully closed position or may be opened to any position between the fully closed position and some predetermined maximum opened position. While these locks do prevent such closures from being opened beyond that predeterminedposition, they do not fully prevent unauthorized entry-into the building since, in the case of most such closure members, it is quite easy to manually raise the slidable member away from its lower track, tilt it slightly away from the track, and remove it from the wall entirely.

Other devices have been manufactured which comprise a member which may be mounted on the door jamb or other structure so that a slidable rod may pass into a hole formed in the frame of the sliding panel. These devices have been provided with a spring-biasing member which tends to drive the rod into the panel bore and against which the rod must be drawn before the panel can be moved. If the spring should break, the rod may easily slide out of the panel bore due to vibration, etc. Further, such locks have only provided a nuisance resistance value in that a determined housebreaker can very simply cut a small hand-hole in the glass, reach into the building, and pull the rod out of the panel bore, thereby allowing the door to be moved to a fully opened position.

Thus, none of the prior art devices have proven to be truly acceptable in that they are not only costly, but also do not sufficiently prohibit house-breaking. As a further disadvantage, their structures generally require that they be mounted in what amounts to a predetermined position relative to the door, the jamb, etc., so that the building owner has little or no option as to the placement of the lock.

SUMMARY OF THE INVENTION The present invention relates to an improved slide lock which may be used with any slidable or hinged closure fitting to prevent unauthorized movement of the fitting.

In a preferred embodiment, the invention comprises a casting base which may be mounted in any desired position relative to an openable closure member. A pair of upstanding ears are formed on the base, between which the shackle of a padlock may be positioned, and through which a bar may be passed along its axis perpendicular to the plane of the padlock shackle. The sliding bar may be machined so as to maintain the padlock in such a position that the bar is prevented from axial movement in either direction due to the dimensional relationship between the shackle, the bar, the ears, and the base. In other words, the slide lock may be padlocked in a position in which the closure member is positively prevented from being moved when the bar is positioned within a bore formed therein.

If desired, a second machined surface may be formed in the slide bar so that the slide bar may be padlocked into a position in which it is prevented from locking the closure member. Thus, the slide lock can be padlocked in either the door locked or unlocked position to prevent unauthorized operation of the lock in either direction.

The base or casting is provided with a plurality of mounting bores through which wood or metal forming screws may be passed for attachment of the casting to the structure on which it is to be mounted. One of the mounting apertures may be positioned so that its axis is perpendicular to and intersects the axis of the slide bar. Thus, the casting cannot be removed from the structure on which it is mounted unless the bar is removed from the casting. Obviously, if a padlock is in place, this is impossible.

As a further feature, the slide bar is provided with a cam surface which is effectively bounded by shoulders. The shoulders cooperate with a camming bolt or screw which is threaded into position in either of the upstanding ears, depending upon the direction the bar is to be moved, to limit the axial travel of the bar by abutment with the bolt. The cam surface is so formed that a portion thereof will easily pass beneath the lower surface of the screw as the bar is moved axially through the ears. When the bar is moved to the locking position so that the lower surface of the screw is positioned over the radially smallest portion of the cam surface, the bar may be rotated about its axis so that the lower surface of the screw will come into contact with the cam surface as a portion thereof having an increased radius is rotated relative thereto.

Consequently, the present invention results in an improved slide lock which may be padlocked to prevent unauthorized opening thereof, which may be held in place by means of friction between a cam surface and a camming screw, and which cannot be removed from its mounting when the slide bar is in place. Additionally,

the apparatus can be mounted in an infinite variety of positions since its simplicity allows it to be reversed by removing the camming screw, axially removing the slide bar from the casting ears, inserting the slide bar into the casting ears from the opposite direction, and placing the camming screw into position in the opposite casting ear. A slide lock formed in accordance with this invention is inexpensive to manufacture since only a limited number of machining operations must beaccomplished and only a very small number of parts must be provided. The lock can be quickly and easily moved between closure-locked and closure-unlocked positions, in-either of which it maybe padlocked-to prevent unauthorized movement to the oppositeposition. Further, when padlocking is not deemed necessary, the device may be actuated to the closure-locked position and the slide bar may be merely rotated about its axis to prevent inadvertent or vibrational movement of the slide bar toward the'closure-unlocked position. As an additional feature, the slide bar may be provided with a center punch on the leading end thereof so that, when the lock is firmly mounted in place on one element of a closure device, a hammer blow on the opposite end thereof will locate a hole center which may then be drilled into the other closure device element to receive the bar in locking relationship.

' Other objects and advantages of the present invention will become apparent from the following description and claims as illustrated in the accompanying drawings which, by way of illustration, show a preferred embodiment of the present invention and principles thereof in what is now considered to be the best mode contemplated for applying those principles. It is recognized that other embodiments of the invention, utilizing the same or equivalent principles may be used and structural changes may be made as desired by those skilled in the art without departing from the present invention which is limited only by the scope of the following claims.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective illustration of a slide lock formedin accordance with a preferred embodirnent of the present invention, showing the lock being used to prevent unauthorized movement of a closure member;

FIG. 2 is a top plan view of the lock base; and

FIG. 3 is an axial elevation of an alternate embodiment of a slide bar which may be utilized with the base shown in FIG. 2.

DETAILED DESCRIPTION Referring now to FIG. 1, there is shown a door jamb member 11 past which a closure member 13 may be slidably or pivotably actuated. A base member 15, through which a pair of mounting screws 17 may be passed, is formed with a pair of upstanding ears 19.

Coaxial bores 21 are formed within the ears 19 so as to perpendicularly intersect the axis of one of the mounting bores through which a screw 17 is passed. This feature will prevent the base from being removed from the jamb 11 when a bar extends between the coaxial apertures 21 as described' below. Each of the ears is also'provided with a threaded bore 23,into one of which a cam screw or bolt 25 may be threaded.

It will be noted that the construction of the base member 15 is such thatit may be formed with only a single flange 26 extending away from the pair of upstanding ears. Whenthe screw "is threaded through flange 26 and into jamb member 11, it keeps the 'entire unit from pivoting about the screw 17 which is between the ears 19. Since a flange does not need to extend away from theears in'the opposite direction, the ears, which are essentially coextensive .with the 'base edges on their outer sides, can be placed veryclose to the upper cornerof sliding glass doors, for example. The

only clearance needed will be that required to allow a padlock to be installed as will be described below; This feature allows the slide lock itself to be positioned within such a confined area that it is essentially'tamperproof. It is nearly impossible to work on the slide lock, or a padlock installed on it, if thusly positioned, with a hacksaw, bolt cutters, etc. In other words, the compactness of the lock allows it to be used in such a way that major structural damage must be accomplished before the locked door can be reopened.

-A slide bar or rod 31 is positioned so as to be axially movable within the bores 21 of the ears 19 and is provided with an operating knob 33 for this purpose. A machined portion 35 is formed in the bar 31 so that when the leading end of the rod extends into an aperture 37 of the closure member 13, as shown in FIG. 1, a padlock shackle (not shown) may -be positioned between the machined portion 35, the ears l9, and the mounting screw 17. When a shackle is so positioned, the slide bar 31 is positively held in place and cannot be axially moved until the padlock is removed. If desired, a second machined portion 41 may be formed in the slide bar 31 so that when the bar is withdrawn from the aperture 37 it may be locked in position by a padlock so as to prevent unauthorized locking of the closure member or removal of the bar 31. The second machined portion 41 is clearly illustrated in FIG. 3.

Although, as explained below, axial movement of the bar 31 out of the locked position can be prevented by a camming action which occurs when the bar is twisted about its axis, this camming action need not be employed, if desired, when a padlock is used. Since the bar 31 is machined at 35, and the machining forms a groove about the entire periphery of the bar, a padlock can be installed when the groove is between the ears l9, regardless ofthe rotational orientation of the bar 31 relative to the ears 19. That padlock will positively prevent axial movement of the bar in either direction, even if it should be twisted by a person not authorized to pass through the door or window thus locked. The bar 31 may be passed through'the coaxial bores 21 from either direction and the camming screw 25 may be inserted into either threaded bore 23 :so that the relationship between the bar and screw is always the same as that illustrated in FIG. 1.'Thus the lock may be mounted in a nearly infinite number of positions, each producing the desired result. v

- Since'the bar can'be passed through the ears in either direction, the base 15 canbe installed near the top or bottom of a door, for example,'withthe flange 26 extending toward the other end of the door. This feature thus preserves the integrity provided'by'thecompactness of the lock since it will always be positionable at a location in which burglary tools cannot be conveniently used.

Intermediate the machined portion 35 and the knob 33, a cam surface 43 may be formed for cooperation with the cam screw 25. Basically, the cam surface may comprise a re-machined portion of the bar which has a tapered surface in eccentric relation to the axis of the bar from between approximately one-half to seveneighths of the circumference thereof. The portion 44 of the cam surface which has a maximum radius relative to the bar axis will easily pass under the leading edge of the cam screw 25 since it is slightly smaller than the radius of the bar 31, but a shoulder 45 adjacent the cam surface and a shoulder 47 at the opposite side of the machined portion 35 which are at the full bar radius, will abut the leading edge of the cam screw when the bar 31 is axially moved, thereby limiting the axial movement thereof.

Of course, if machine portion 41 is also formed, shoulder 47 will be reduced so as to pass under screw 25 and shoulder 48 will then limit the travel of the bar.

When the bar 31 is rotated about its axis so that the minimum radius portion of the cam surface 43 is opposed to the cam bolt 25, the bar may be axially moved until the cam bolt enters into abutment with one of the shoulders 45 or 47. If the bar is moved to the position illustrated in FIG. 3, the knob may then be rotated so as to rotate the bar about its axis. This causes an increased radius portion of the cam surface 43 to be rotated into contact with the leading edge of the cam screw until a tight friction gripping occurs, thereby preventing movement of the bar in either direction until rotation of the bar is once again accomplished. The taper formed on the cam surface will also aid in prohibiting movement of the bar from locking engagement with the closure member if the slide lock is mounted so that the bar axis is in the vertical position and must be pushed upward to lock a closure member in place since attempted axial movement of the barby hand or by gravitational force-will only serve to wedge the screw more tightly against the inclined portion of the cam surface.

In normal, everyday use around a house, it will probably be impractical to install a padlock over the bar 31 since easy access is needed by the occupants. The average housewife, for example, need only reach up (or down), push the bar into the opening, and twist it about one-half turn or less and the door will be securely locked to prevent pets and children from leaving the house and unwanted intruders from entering. Conversely, a simple twist and pull on the bar allows the door to be immediately opened. On the other hand, for extended absences from the house, such as during vacations, the bar may be pushed in, twisted if desired (but this is unnecessary), and a padlock shackle installed over the groove and between the ears. In either case, the house or other building is as secure as necessary under the circumstances.

Thus, as can be seen, with the exception of the mounting screws, only three pieces of structure need be utilized to form an effective closure lock. If a padlock is used in the manner described, the cam screw might be considered to be unnecessary. On the other hand, if it is convenient to lock the closure member in place without using a padlock, simply twisting the knob 33 will result in a firm friction locking of the slide bar so as to prevent its inadvertent withdrawal from the bore formed in the closure member.

As shown in FIG. 3, the bar 31 may be formed with a center punch 51 on the leading end thereof. When the base 15 is fastened to element 11, the bar may be passed through the apertures 21 as shown in FIG. 1. A hammer blow may then be exerted on the end 33 of the bar, causing the center punch 51 to locate a hole center in the element 13. A hole 37 may then be drilled into the latter element and this action may be repeated for as many holes as are to be located in the element 13 for various door positioning locations.

Since the bar may be inserted through the base from either direction, the lock may be mounted in a variety of positions limited only by the imagination of the user. Further, the lock may be used not only for sliding closure members, but also for standard, hinged doors, for example, by mounting the base on either the door or the jamb and positioning a piece of structure having a bore therein on the opposite member in coaxial relationship with the sliding bar. I

Thus the applicant has provided an embodiment of a new and improved concept in the lock art which yields a true advancement in that art brought about by a simplicity of design coupled with a greater degree of utility due to the versatility of the means for locking the sliding bar and the structure for allowing it to be mounted in a variety of positions.

Many further modifications and alterations of the illustrated embodiments, as well as other embodiments, will be obvious to those skilled in the art without exceeding the scope of the invention as defined in the following claims, wherefore what is claimed as the invention is:

l. A locking device comprising a base member having a pair of upstanding ears at one end thereof and integral therewith, said ears each being substantially coplanar with at least two peripheral edges of said base member and having coaxial apertures therein,

means intermediate said ears and passing through said base member for allowing said base member to be fastened to one element of a pair of elements which are to be locked against relative movement, means for preventing said base member from pivoting about said intermediate means, and a bar movement limiting and preventing means in at least one of said ears and extending into said coaxial aperture therein, a bar mounted in said coaxial apertures for cooperation with said movement limiting and preventing means and slidable relative thereto between an extended position in which it extends beyond one of said ears a sufficient distance to engage the second element of a pair of elements which are to be locked against relative movement and a retracted position in which it is withdrawn from such a sufficient distance, said bar having a reduced diameter section, one extremity of which abuts said movement limiting and preventing means in each of said extended and retracted positions and a wedging section of varying diameter, relative to the axis of said bar, within said reduced diameter section and terminating at at least one extremity of said reduced diameter section, and said bar being rotatable between a first position in which said bar is freely slidable between said extended and retracted positions, as limited by said movement limiting and preventing means, and a second position in which said varying diameter section of said bar is wedged against said movement limiting and preventing means, thereby selectively preventing axial movement of said bar when the latter is in said extended position. 2. The device of claim 1 wherein said bar further includes shackle-receiving means thereon which is positioned intermediate said ears when said bar is in said extended position. 3. The device of claim 1 wherein said bar further includes shackle-receiving means thereon which is positioned intermediate said ears, when said bar is in said retracted position. 4. The device of claim 1 wherein said bar further includes center punch means thereon for locating bar-receiving aperture centers in an element to be locked by said device. 5. The device of claim 1 wherein said bar includes means forming a groove about the entire periphery of said bar and so located thereon as to be intermediate said upstanding ears when said bar is in said extended position said groove, said base member, and said ears being so formed relative to one another as to allow a padlock shackle to pass therebetween in a close fitting relationship to lock said bar in said extended position regardless of whether said bar has been rotated to said first or second position. 6. A locking device for preventing relative movement between a pair of movable elements comprising a base member having a pair of separated upstanding ears thereon, each including a first aperture extending therethrough and coaxial with a similar first aperture in the other of said ears, at least one of said ears also having a second aperture extending from a surface of the ear and intersecting the one of said coaxial apertures therein, and movement limiting means fixed in said second aperture and extending into the one of said first coaxial apertures therein, bar member extending through said first coaxial apertures and the space between said ears and having a first end which may be extended into one element of the pair of movable elements to prevent such relative movement, a second end including means for gripping said bar member for movement thereof, and an intermediate section comprising ties thereof to pass said movement limiting means fixed in said second aperture, a second portion, located between the axial ex: tremities of said first portion, which is small enough to pass said means fixed in said second aperture, and

wedging surface extending between said second portion and at least one extremity of said first portion to prevent axial movement of said bar member when said wedging surface is forced into contact with said movement limiting means fixed in said second aperture. 7. A lock to prevent relative movement between two elements comprising a base member having means for supporting a slidable bar for movement relative to said base member so that the locking portion of a slidable bar may be extended from and retracted into said base member and means for limiting the travel of the slidable bar relative to said supporting means, a slidable bar mounted in said supporting means and having a lockingportion,

a pair of shoulders on said bar for abutment with.

saidlimiting means, at least one of said pairs of shoulders having a portion thereon which can pass under said limiting means, and means for wedging said bar against said limiting means upon rotation of said bar from a position in which said at least one of said pair of shoulders can pass under said limiting means toward a position in which said at least one of said pair of shoulders could not pass under said limiting means. 8. The device of claim 7 wherein said slidable bar further includes center punch means thereon for locating bar-receiving aperture centers in an element to be locked by said device. 9. The lock of claim 7 including shackle-receiving means formed on said slidable bar for prohibiting axial movement of said slidable bar when a padlock shackle is positioned therein. 10. The lock of claim 9 wherein said shackle-receiving comprises at leastone recess" formed entirely about the periphery of said bar so that a shackle may be positioned thereon regardless of the rotational orientation of said bar. 11. A- lock to prevent relative movement between two elements comprising a base member having means for supporting a slidable bar for movement relative to said base member so that the locking portion of a slidable bar may be extended from and retracted into said base member and means for limiting the travel of V the slidable bar relative to said supporting means,

9 .10 a slidable bar mounted in said supporting means and a second portion which will pass under and not having abut said limiting means, and a locking portion a means for wedging said bar into a fixed position a i i Shoulders on Sald bar for abutment with within said support means when said second said l1m1t1ng means, 5

portion is passed under said limiting means and at least one of said pair of shoulders having Said bar is rotated relative thereto a first portion which will abut and not pass under said limiting means and

Claims (11)

1. A locking device comprising a base member having a pair of upstanding ears at one end thereof and integral therewith, said ears each being substantially coplanar with at least two peripheral edges of said base member and having coaxial apertures therein, means intermediate said ears and passing through said base member for allowing said base member to be fastened to one element of a pair of elements which are to be locked against relative movement, means for preventing said base member from pivoting about said intermediate means, and a bar movement limiting and preventing means in at least one of said ears and extending into said coaxial aperture therein, a bar mounted in said coaxial apertures for cooperation with said movement limiting and preventing means and slidable relative thereto between an extended position in which it extends beyond one of said ears a sufficient distance to engage the second element of a pair of elements which are to be locked against relative movement and a retracted position in which it is withdrawn from such a sufficient distance, said bar having a reduced diameter section, one extremity of which abuts said movement limiting and preventing means in each of said extended and retracted positions and a wedging section of varying diameter, relative to the axis of said bar, within said reduced diameter section and terminating at at least one extremity of said reduced diameter section, and said bar being rotatable between a first position in which said bar is freely slidable between said extended and retracted positions, as limited by said movement limiting and preventing means, and a second position in which said varying diameter section of said bar is wedged against said movement limiting and preventing means, thereby selectively preventing axial movement of said bar when the latter is in said extended position.

2. The device of claim 1 wherein said bar further includes shackle-receiving means thereon which is positioned intermediate said ears when said bar is in said extended position.

3. The device of claim 1 wherein said bar further includes shackle-receiving means thereon which is positioned intermediate said ears when said bar is in said retracted position.

4. The device of claim 1 wherein said bar further includes center punch means thereon for locating bar-receiving aperture centers in an element to be locked by said device.

5. The device of claim 1 wherein said bar includes means forming a groove about the entire periphery of said bar and so located thereon as to be intermediate said upstanding ears when said bar is in said extended position said groove, said base member, and said ears being so formed relative to one another as to allow a padlock shackle to pass therebetween in a close fitting relationship to lock said bar in said extended position regardless of whether said bar has been rotated to said first or second position.

6. A locking device for preventing relative movement between a pair of movable elements comprising a base member having a pair of separated upstanding ears thereon, each including a first aperture extending therethrough and coaxial with a similar first aperture in the other of said ears, at least one of said ears also having a second aperture extending from a surface of the ear and intersecting the one of said coaxial apertures therein, and movement limiting means fixed in said second aperture and extending into the one of said first coaxial apertures therein, a bar member extending through said first coaxial apertures and the space between said ears and having a first end which may be extended into one element of the pair of movable elements to prevent such relative movement, a second end including means for gripping said bar member for movement thereof, and an intermediate section comprising a first portion, defined by axially separated extremities thereof, which are intermediate said first and second ends, extending about the periphery of said bar member, which first portion is small enough to pass through said first apertures but too large to permit the extremities thereof to pass said movement limiting means fixed in said second aperture, a second portion, located between the axial extremities of said first portion, which is small enough to pass said means fixed in said second aperture, and a wedging surface extending between said second portion and at least one extremity of said first portion to prevent axial movement of said bar member when said wedging surface is forced into contact with said movement limiting means fixed in said second aperture.

7. A lock to prevent relative movement between two elements comprising a base member having means for supporting a slidable bar for movement relative to said base member so that the locking portion of a slidable bar may be extended from and retracted into said base member and means for limiting the travel of the slidable bar relative to said supporting means, a slidable bar mounted in said supporting means and having a locking portion, a pair of shoulders on said bar for abutment with said limiting means, at least one of said pairs of shoulders having a portion thereon which can pass under said limiting means, and means for wedging said bar against said limiting means upon rotation of said bar from a position in which said at least one of said pair of shoulders can pass under said limiting means toward a position in which said at least one of said pair of shoulders could not pass under said limiting means.

8. The device of claim 7 wherein said slidable bar further includes center punch means thereon for locating bar-receiving aperture centers in an element to be locked by said device.

9. The lock of claim 7 including shackle-receiving means formed on said slidable bar for prohibiting axial movement of said slidable bar when a padlock shackle is positioned therein.

10. The lock of claim 9 wherein said shackle-receiving comprises at least one recess formed entirely about the periphery of said bar so that a shackle may be positioned thereon regardless of the rotational orientation of said bar.

11. A lock to prevent relative movement between two elements comprising a base member having means for supporting a slidable bar for movement relative to said base member so that the locking portion of a slidable bar may be extended from and retracted into said base member and means for limiting the travel of the slidable bar relative to said supporting means, a slidable bar mounted in said supporting means and having a locking portion, a pair of shoulders on said bar for abutment with said limiting means, at least one of said pair of shoulders having a first portion which will abut and not pass under said limiting means and a second portion which will pass under and not abut said limiting means, and means for wedging said bar into a fixed position within said support means when said second portion is passed under said limiting means and said bar is rotated relative thereto.

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