US3451703A - Tamperproof slide lock for doors - Google Patents

Description

June 1969 c. D. ROEGNER TAMPERPROOF SLIDE LOCK FOR DOORS Filed July 7. 1967 INVENTOR. Char/es l7. Foggy 21; WM v Affa/wQ/s' United States Patent US. Cl. 292-148 2 Claims ABSTRACT OF THE DISCLOSURE A tamperproof slide lock for doors and the like having a base plate secured to the door by fasteners such as screws. The bolt is carried by a slide plate and the bolt passes through at least one lug, carried by the base plate whereby the base plate and slide plate are captive and the bolt may be moved from locked to unlocked position by sliding the slide plate relative to the base plate. The slide plate isprovided with openings which provide access to the fasteners only when the parts are in an intermediate position, between. locked and unlocked position. Openings in the slide plate and. base plate permit a padlock or the like to secure the device either in locked or unlocked position, thus preventing the removal of the fasteners in either position.

My invention relates to tamperproof slide locks for doors and the like and has for an object the provision of such a device which may be secured in either locked or unlocked position by means of a padlock whereby the fasteners securing the base plate to the door are inaccessible.

Another object of my invention is to provide a device of the character designated in which the base plate and slide plate are captive relative to each other, preferably by providing a pair of lugs on the base plate through which the bolt slides and further to provide, between the lugs, an enlargement on the bolt, thus completing the captive assembly of the parts.

A further object of my invention is to provide a device of the character designated which the base and slide plates may be of angle shape in cross section, the out- 'standing leg of the base plate being provided with a single opening and the outstanding leg of the slide plate being provided with two openings, the openings being so relatively arranged that the hasp of a padlock or the like may be passed through the openings, selectively, thus to lock the device either with the bolt extended or with the bolt withdrawn, thereby preventing the movement of the parts to the intermediate, fastener exposing position.

In the art to which this invention relates a considerable amount of difliculty has ben experienced by warehouse and store owners with dishonest employees who, while working in normal. store hours will remove the fasteners from locks and the like, generally at a back or side door. After store hours such employees are therefore able to open the tear or side door of the establishment and make away with merchandise therein.

My invention contemplates a slide lock, the base plate of which is held to the door by fasteners and the slide of which may be locked in such position as always to cover the fasteners, whether the bolt is in door locking or door unlocking position. Thus, in compliance with the usual fire laws, the rear or side doors, during store hours, must be unlocked and yet, with my invention, with the padlock or other locking device in place on my improved slide lock, the securing fasteners for the base plate are inaccessible even though the door itself is unlocked. Further, when it is desired to lock the door after store hours the slide lock is moved to door locking position and the padlock inserted and the fasteners still are inaccessible.

3,451,703 Patented June 24, 1969 I 2 Further, my invention contemplates making captive the slide and lock plates and to provide an automatic stop means for holding the parts assembled which also properly align the holes for the padlock in the respective base and slide plates.

Apparatus illustrating features of my invention is shown in the accompanying drawings forming a part of this application, in which:

FIG. 1 is a view of the apparatus showing the same mounted on the free edge of a door and with the bolt thereof in engagement with a keeper mounted adjacent the opening in which the door moves;

FIG. 2 is a side elevational view of the same in the position shown in FIG. 1 but with the keeper and padlock removed;

FIG. 3 is a front elevational view showing the parts in the intermediate position, that is, a position between locked and unlocked relation thereby to expose the fasteners which hold the base plate to the door;

FIG. 4 is a view corresponding to FIG. 1 with keeper omitted and showing the slide bolt assembly padlocked in door unlocking position;

FIG. 5 is a side elevational view of the apparatus in the position shown in FIG. 4; and,

FIG. 6 is an end elevational view of the device shown in FIG. 3.

Referring now to the drawings for a better understanding of my invention I show the same as being mounted upon the side of a door at the end thereof, a fragment of which is indicated at 10. As the description proceeds it will be apparent that my invention may be applied to hinged, sliding and folding doors, and other types of closures.

As best shown in FIGS. 1 and 4, the base plate 11 is secured with its longer leg 11a flush with the side of the door and is held in place by means of a plurality of fasteners 14 which may be wood screws. The device thus is mounted adjacent the free end of the door and in position for the end 16 of the bolt 13 to project into a keeper 17 mounted in a stationary part of the opening in which the door is hung.

The base plate is provided with a pair of spaced apart lugs 18 and 19 having aligned openings therein through which the bolt 13 is slideably received. An enlargement 21 which may be in the form of a washer or the like is secured to the bolt 13 between the lugs 18 and 19. As will appear this enlargement acts to hold the slide plate, 12 captive relative to the base and also serves to align certain openings in the legs of the slide plate 12 and base plate.

The slide plate 12 is provided with an outstanding leg or projection 22 which slides alongside a similar projection 23 on the base plate 11. The leg 23 is provided with a single opening therethrough indicated at 24 and which is located adjacent the end of the assembly opposite the bolt. The leg 22 of the slide plate is provided with a pair of spaced openings 26 and 29 which, when the slide is moved relative to the base may be selectively aligned with the opening 24. Therefore, with the parts in the position of FIG. 1 and the opening 26 aligned with opening 24, the hasp 27 of a padlock 28 may be inserted through the openings thus to lock the slide and base plate with the bolt extended. A third opening 29 is provided in the leg 22 of the slide plate. With the parts in the position of FIG. 4 the openings 29 and 24 are aligned whereby the padlock may be inserted to lock the parts with the bolt withdrawn.

It will be noted that the leg 31 of the slide plate is provided with a plurality of openings 32. These openings are so disposed longitudinally of the slide plate and laterally thereof that when the parts are in the position of FIG. 3 the openings 32 uncover the screws 14. In this manner the screws may be inserted or removed. However, and as stated, when the device is secured by means of the padlock in either bolt latched or unlatched position, all the fasteners except the uppermost one 14 as shown in FIG. 4 are covered and hence are inaccessible.

It further will be noted that the enlargement on washer 21 is so relatively spaced that when the bolt is pushed outwardly the washer strikes against the side of lug 18, thus to bring the openings 24 and 26 into alignment. When in the position of FIG. 4 enlargement 21 strikes the side of lug 19 thus to bring openings 24 and 29 into alignment.

It will be apparent that instead of using angle shaped members the parts may be built with projections corresponding to the legs 22 and 23, these being long enough, of course, to afford the positioning of the openings in the legs 22 and 23.

In view of the foregoing it will be apparent that I have devised an improved tamperproof bolt type slide lock. In use, during the daytime or normal store hours, the manager of the store locks the device in the position in FIG. 4 whereupon the door may be opened as required by the fire code. In this position it is impossible for dishonest employees or others to remove the fasteners, At night, or when the store is closed, the parts are locked in the position of FIG. 1, similarly covering and making inaccessible the fasteners. It will also be noted that by cutting an L-shaped portion away from the top of the slide as indicated at 33 the upper leg 31 of the slide plate may lie directly on the upper surface of the longer leg of the base plate 11, whereby the lugs 18 and 19 afiord some degree of protection against knocking the slide plate off the base plate. However, it would be practical to secure the bolt by welding or otherwise to the leg 31 and cut the leg off all the way across along the line 34. This would eliminate some of the upper fasteners, but in some circumstances such an arrangement would be satisfactory.

In view of the foregoing it will be apparent that I have devised an improved slide type of lock which is tamperproof. In use I have found the device to be practical, simple of operation and reliable.

While I have shown my invention in but one form, it will be obvious to those skilled in the art that it is not so limited, but is susceptible of various other changes and modifications without departing from the spirit thereof.

What I claim is:

1. In a tamperproof slide lock for doors mounted in openings,

(a) a base plate adapted to be secured to the door adj acent the free end thereof, (b) a plurality of spaced apart fasteners passing through the base plate and into the door for securing the base plate to the door,

(c) a slide plate,

(d) a bolt carried by the slide plate and disposed in extended locked position to engage a keeper mounted adjacent the door opening and in withdrawn position to permit the door to move relative to the open- (e) an outstanding lug on the base plate slideably receiving the bolt, (f) means to secure the slide plate against movement relative to the base plate both in bolt extended, locked position and bolt withdrawn, unlocked position, and (g) openings through the slide plate spaced apart on centers corresponding with the spacing of said fasteners and alignable with said fasteners only when the slide plate is in an intermediate position between said locked and unlocked positions, the relative disposition of said fasteners and openings when the slide plate is secured in both the locked and unlocked positions being such that said fasteners are inaccessible. 2. Apparatus as defined in claim 1 in which the base plate and slide plate are provided with outwardly turned projections slideable alongside each other, said means to secure the slide plate against movement relative to the base comprising openings through the outturned projections on the slide plate and base plate, certain of said openings coming into alignment when the parts are in locked position and others thereof coming into alignment when the parts are in unlocked position, whereby a securing member may be passed through the openings thereby to secure the parts against relative sliding movement selectively in locked or unlocked position.

References Cited UNITED STATES PATENTS 2,198,079 4/1940 Ferris et al. 292143 2,468,406 4/1949 Mora -129 2,482,341 9/1949 Holmsten 292----148. 2,974,987 3/1961 OBrien 292-148 3,334,933 8/1967 Ehlers 292148 FOREIGN PATENTS 853,639 12/1939 France. RICHARD E. MOORE, Primary Examiner.

R. L. WOLFE, Assistant Examiner.

U.S. Cl. 70-129

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