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Publication numberUS3421787 A
Publication typeGrant
Publication dateJan 14, 1969
Filing dateJun 1, 1967
Priority dateJun 1, 1967
Publication numberUS 3421787 A, US 3421787A, US-A-3421787, US3421787 A, US3421787A
InventorsBehrman Arthur, Hoffman Louis
Original AssigneeBehrman Arthur, Hoffman Louis
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Auxiliary door lock
US 3421787 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

4, 1969 HOFFMAN ET AL 3,421,787

AUXILIARY DOOR LOCK Filed June 1, 1967 I Sheet 0f 2 IN VENTORS LOUIS HOFFMAN flfiTHl/I? Beak/WM! wrap/m 'Jan. 14, 1969 L. HOFFMAN ET AL 3,421,787

AUXILIARY DOOR LOCK Sheet Filed June 1, 1967 INVENTORJ HOFFMAN United States Patent 4 Claims ABSTRACT OF THE DISCLOSURE Auxiliary door locks of removable or semi-permanent type, suited for use on hotel and motel room doors and elsewhere, auxiliary to or in substitution of existing door locks.

Background of the invention Field of the invention.--This invention has two principal uses: The first is the provision of a portable, removable door lock which may be installed on hotel and motel room doors and the like, to guard against unauthorized entry by persons having keys to the existing door locks. The second use involves the provision of a semipermanent auxiliary door lock which may be mounted on door posts to supplement existing door locks. The latter use would be applicable to more permanent tenants, rooming house guests and apartment house and private home occupants. In either case the lock proper is entirely removable from the door when not in use.

Description of the prior art.The following United States patents were developed in the course of two Patent Ofiice searches and they are believed to constitute the closest art to this invention: 584,677, 588,619, 614,052, 692,083, 826,538, 1,252,003, 1,869,689, 1,947,773, 2,067,779, 2,665,935, 2,903,286.

Summary of the invention The invention comprises three basic components: a keeper plate 'which is either removably secured or otherwise afiixed to the door post, a locking plate which engages the door, and a sliding bolt mounted on the locking plate for engagement with the keeper plate. An important feature of the invention resides in the fact that the locking plate is caused to interlock with the keeper plate when the bolt is moved into locking position. Consequently there is a locking action by both the locking plate and the bolt with respect to the keeper plate.

Two embodiments of the invention are illustrated in the drawing and described in the specification. In the first embodiment the keeper plate is provided with a hookshaped inner end portion which engages the existing door jamb locking plate on the door post. The former is simply hooked into the latter and is readily removable therefrom. In the second embodiment the keeper plate is screwed or otherwise secured to the door post, this being in addition to the usual door jamb locking plate existing thereon. In this second embodiment of the invention, the keeper plate is intended for relatively permanent attachment to the door post in the sense that it is not designed for removal following each use.

Brief description of the drawing FIGURE 1 is a perspective view of an auxiliary door lock made in accordance with one form of the invention, wherein the keeper plate is hooked into the existing door jamb locking plate on the door post.

FIGURE 2 is a perspective View of the keeper plate component.

FIGURE 3 is a perspective view of the locking plate component of said door lock.

3,421,787 Patented Jan. 14, 1969 "ice FIGURE 4 is a transverse section on the line 44 of FIGURE 3.

FIGURE 5 is a horizontal section through the assembled door lock, showing it mounted in engagement with a conventional door and door post.

FIGURE 6 is a perspective view of a conventional door and door post, showing mounted thereon a door lock made in accordance with the second form of this invention.

FIGURE 7 is a fragmentary section taken on the line 77 of FIGURE 6.

FIGURE 8 is a fragmentary horizontal section showing how the keeper plate is secured to the door post and showing also how the locking plate engages the keeper plate.

FIGURE 9 is a perspective view of the assembled door lock made in accordance with the second embodiment of this invention.

Description of a preferred embodiment Referring in the first instance to the first form of this invention as illustrated in FIGURES 1-5 inclusive it will be observed that auxiliary door lock 10 consists of three main components: a keeper plate 12, a locking plate 14 and a sliding bolt 16.

The keeper plate 12 comprises an elongated strip hav ing a hook-shaped element 20 at one end, a slightly curved or bent end portion 22 at its opposite end, and an elongated shank 24 intermediate said hook and end portions 20 and 22, said shank being provided with a plurality of spaced notches 26 on opposite side edges thereof. A plurality of holes 28 may also be formed in said shank.

The locking plate 1 4 is a generally rectangular member having a transverse slot 30 formed therein to receive the keeper plate. A channel 32 is formed on said locking plate between a flange 34 along one side edge of said plate and a rib 36 formed a space-d distance from said flange, in parallel relation thereto. Channel 3 2 is adapted to receive and retain the sliding bolt 16 above mentioned.

The sliding bolt is a generally L-shaped member having a foot portion 40 and a transversely bent handle portion 42. The foot portion is adapted to slide within and along channel 32, handle portion 42 being the element by which it is manually moved in either direction along said channel.

It will now be observed that a longitudinally extending slot 44 is formed in the foot portion of said L-shaped sliding bolt 16 and a rivet 46' secured to the locking plate 14 and extending through slot 44 locks said sliding bolt in said channel while permitting it limited longitudinal movement therein.

In the use of this device hook-shaped element 20 of .keeper plate 12 is hooked into the existing locking plate 50 in door jamb 52. The locking plate 14 is then threaded upon the shank of said keeper plate as shown in FIGURES 1 and 5. When the locking plate is relatively tight against the door jamb 52 and door 54 sliding bolt 16 is moved into engagement with the nearest notch 26. However, in order to enable the sliding bolt to enter said notch it is necessary to move the keeper plate laterally so that the oppositely situated notch will engage the locking plate 14 in the manner shown in FIGURE 1. Stated differently, oppositely situated notches 26 on the keeper plate are respectively engaged by the sliding bolt and the locking plate 14. The keeper plate is accordingly not perpendicular to the plane of the locking plate. This firmly locks the two plates together and prevents unauthorized opening of the door, regardless of whether the existing door lock is or is not in locking position.

When it is desired to open the door the sliding bolt is disengaged from the keeper plate and this enables the keeper plate to be disengaged from the locking plate 14. The locking plate 14 is then removed from the keeper Description of a second embodiment Referring now to the second form of this invention as illustrated in FIGURES 6-9 inclusive it will be observed that auxiliary door lock 100 consists of three main components: a keeper plate 112., a locking plate 114 and a sliding bolt 116.

The keeper plate 112 comprises an elongated strip having a mounting plate element 120 at one end, a rounded end portion 122 at its opposite end and an elongated shank 124 intermediate said mounting plate and end portions 120 and 122, said shank being provided with a plurality of spaced notches 126 on opposite side edges thereof. A plurality of holes may optionally be formed in said shank.

The locking plate 114 is similar to that in the first form of this invention as above described, being a generally rectangular member having a transverse slot 130 formed therein to receive the keeper plate. A channel 132 is formed on said keeper plate between a flange 134 along one side edge of said plate and a rib 36 formed a spaced distance from said flange, in parallel relation thereto. Channel 132 is adapted to receive and retain sliding bolt 116 above mentioned.

The sliding bolt is a generally L-shaped member having a foot portion 140 and a transversely bent handle portion 142. The foot portion is adapted to slide within and along channel 132, handle portion 142 being the element by which it is manually moved in either direction along said channel.

It will again be observed that a longitudinally extending slot 144 is formed in the foot portion of said L-shaped sliding bolt 116 and a rivet 146 secured to the locking plate 114 and extending through slot 144 locks said sliding bolt in said channel while permitting it limited longitudinal movement therein. It is apparent that the sliding bolt and rivet of this second embodiment are similar to the same members in the first embodiment.

In the use of this device mounting plate element 120 of keeper plate 112 is secured by conventional permanent means to door jamb 152, as by the wood screws shown in the drawing. The locking plate 114 is then threaded upon the shank of said keeper plate as shown in FIGURES 6-9 inclusive. When the locking plate is relatively tight against the door jamb 152 and the door 154 sliding bolt 116 is moved into engagement with the nearest notch 126. However, in order to enable the sliding bolt to enter said notch it is necessary to move the locking plate rotationally so that the oppositely situated notch will engage the looking plate in the manner shown in FIGURE 7. Stated differently, oppositely situated notches 126 on the keeper plate are respectively engaged by the sliding bolt and the locking plate 114. The keeper plate is accordingly not perpendicular to the plan of the locking plate. This firmly locks the two plates together and prevents unauthorized opening of the door, regardless of whether the existing door lock is or is not in locking position.

When it is desired to open the door the sliding bolt is disengaged from the keeper plate and this enables the keeper plate to be disengaged from the locking plate 114. The locking plate 114 is then removed from the keeper plate and the door is opened. The keeper plate remains secured to the door jamb for repetitive use.

While there have been described two embodiments of the present invention it is clear that other embodiments and modifications may be had in accordance with the teachings thereof and the scope of the claims. For example, the holes which may be placed in the shank portions of the keeper plate are adapted to receive a sliding cylinder bolt which may be in addition to or in place of the sliding bolt shown in the drawing and above described. Also, the slightly curved end portion 22 of keeper plate 12 of the first form of this invention may be replaced by any other handle means which permits manual retention of the keeper plate in the door jamb locking plate while the door is being closed and while the sliding bolt and locking plate are being engaged therewith.

What is claimed is:

1. An auxiliary door lock comprising:

a keeper plate, said keeper plate engaging the door jamb and having a plurality of spaced notches on opposite side edges thereof;

a locking plate, said locking plate being adapted i conjunction with said keeper plate to constrain the door against opening; and

a sliding bolt, said sliding bolt being mounted in side- 'by-side relationship on said locking plate and selectively engaging one of said notches on said keeper plate, the respective notch on the opposite edge of said keeper plate engaging said locking plate in nonperpendicular relation to the plane of said locking plate.

2. An auxiliary door lock in accordance with claim 1 wherein said sliding bolt is secured in sliding relation to said locking plate by means of a rivet secured to said locking plate and a transverse slot in said sliding bolt engaging said rivet.

3. An auxiliary door lock in accordance with claim 2 wherein said keeper plate comprises:

a hook-shaped end, said hook-shaped end being adapted to engage the door jamb locking plate;

a curved opposite end; and

an elongated shank intermediate said hook-shaped end and said curved opposite end and having said notches situated on opposite side edges thereof.

4. An auxiliary door lock in accordance with claim 2 wherein said keeper plate comprises:

a mounting plate end, said mounting plate end being conventionally securable to the door jamb;

a rounded opposite end; and

an elongated shank intermediate said mounting plate end and said rounded opposite end and having said notches situated on opposite side edges thereof.

References Cited UNITED STATES PATENTS 584,677 6/ 1897 Doyle 292292 1,869,689 8/ 1932 Holland 292-288 2,903,286 9/1959 Richard 292295 FOREIGN PATENTS 77,031 1/ 1954 Denmark.

MARVIN A. CHAMPION, Primary Examiner.

E. J. MCCARTHY, Assistant Examiner.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US584677 *Nov 24, 1896Jun 15, 1897 Door-securer
US1869689 *Dec 20, 1930Aug 2, 1932James HollandDoorlock
US2903286 *Feb 11, 1957Sep 8, 1959Joseph RichardDoor lock
DK77031A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3475929 *Dec 9, 1968Nov 4, 1969Weingart Richard I NPortable locking device
US4575140 *Feb 28, 1983Mar 11, 1986Kenneth DargisDoor lock method and apparatus
US5098142 *Sep 24, 1990Mar 24, 1992Fontenot Albert MDoor security lock
US5360245 *Feb 22, 1994Nov 1, 1994Johnnie DavidRemovable door lock for hotels and the like
US5401068 *May 11, 1994Mar 28, 1995Barnard; Robert N.Portable door locking mechanism
US5480200 *Sep 8, 1994Jan 2, 1996Aintablian; DavidPortable auxiliary door lock
WO1997006330A1 *Jul 12, 1996Feb 20, 1997Flores Gonzalez Hector ManuelDevice for securing private property
Classifications
U.S. Classification292/289
International ClassificationE05C19/00, E05C19/18
Cooperative ClassificationE05C19/182
European ClassificationE05C19/18A