GB2216591A

GB2216591A - An improved door lock

Info

Publication number: GB2216591A
Application number: GB8906410A
Authority: GB
Inventors: David Ronald Perrett
Original assignee: BUSHBOARD PARKER Ltd
Current assignee: BUSHBOARD PARKER Ltd
Priority date: 1988-03-22
Filing date: 1989-03-21
Publication date: 1989-10-11
Also published as: GB8806757D0; GB8906410D0

Abstract

A lock for securing a door (14) in a frame or to a pilaster comprises a body member (32) which is secured by screws to the frame (3) and a rotatable member (5) which is mounted on a shaft or drive peg (6) rotatably mounted in the body member (32). The rotatable member (5) takes the form of a disc having a boss (10) eccentrically mounted on it which boss is mounted on a sleeve (33) in which the shaft (6) is non-rotatably fixed. The eccentric mounting of the disc (5) provides a projecting portion (12) by means of which the edge of the door (14) can be engaged to lock the door in a closed position. A handle (13) enables the disc to be pivoted to a position in which it is free of the door to permit said door to be opened. An indicating disc (9) is mounted on the shaft (6) on the other side of the frame (3) and is covered by a plate (19) having an aperture (20) through which only a portion of the indicating disc (9) is visible. The disc (9) is appropriately marked, for example "VACANT" and "ENGAGED" to indicate the position of the lock. <IMAGE>

Description

Title: AN IMPROVED LOCK This invention relates to an improved lock for securing a door in a frame or to a pilaster and is particularly concerned with locks for use in changing cubicles or toilets.

An aim of the present invention is to provide an improved lock which is simple to operate and has an emergency release mechanism.

According to the present invention, there is provided a lock for securing a door in a frame or to a pilaster, said lock comprising a body member, which is securable either to a door or to a frame or pilaster, and a rol:atable member pivoted in the body member between a locked and an unlocked position, wherein the rotatable member has a projecting portion which, on pivoting of the rotatable member to the locked position, is engageable with the frame or pilaster or the door o lock the door in a closed position.

Preferably, the body member is cylindrical with a central aperture through whist a pivot for the rotatable member passes.

ConvenienI-ly, the rotatable member is disc-shaped and has an eccentrically mounted pivot.

The rotatable member conveniently has a handle to pivot the member between the locked and unlocked positions In one preferred construction, the lock includes a disc-shapeq plate mounted on the door or on the frame or pilaster on the opposite face to the rotatable member and secured to the body member, the plate having grooves in opposite edges thereof, in which are engageable projections on a circular flange of a cover plate.

Preferably, the door or the frame or pilaster has a buffer against which the frame or pilaster or the door abuts. The rotatable member may conveniently be provided with a cam-like surface on its projecting portion which is arranged to engage the door or the frame or pilaster to lock the door firmly in the closed position.

The invention will now be further described, by way of example, with reference to the drawings, in which: Figure 1 is a fragmentary plan view, partly in section, o one embodiment of a lock according to the invention fitted to a frame for securing a door thereto; Figure 2 is a front elevation of the lock shown in Figure 1 in its closed position; Figure 3 i; a similar view to Figure 2 but showing the lock;in its open position; Figure 4 is a fragmentary section taken along the line 3-3 of Figure 1; Figure 5 is a front elevation of a second embodiment of a lock according to the invention fitted to a frame for securing a door thereto, the lock and the door being shown in the closed position; Figure 6 is a section taken on the line VI-VI in Figure 5 in the direction of the arrows;; Figure 7 is an enlarged detail of the part of the lock indicated by the circle VII in Figure 6; Figure 8 is a section taken on the line VIII-VIII in Figure 5 in the direction of the arrows; and Figure 9 is a front elevation, corresponding to Figure 5, but showing the lock in the open position.

In the drawings, like parts are denoted by like reference numerals.

Reference will first be made to Figures 1 to 4 of the drawings in which the lock comprises a cylindrical body 1 with a central aperture 2. The body is secured to a frame 3 by two threaded screws 4 passing through the frame. Rotatably mounted on the body 1 is a discshaped locking plate 5 eccentrically mounted by a rectangula:e hole on a square-shaped shank on the shaft 6 which passes through the aperture 2 in the body and through a hole 7 drilled in the frame 3.

The shaft is rotatably secured on the other side of the body and frame by a boss 8 carrying an indicating disc 9. The boss has a square hole fitting on a corresponding square-shaped end of the shaft 6.

The indicating disc has appropriate markings to show the condition of the lock, i.e. whether it is locked or unlocked.

The locking plate 5 has an eccentric boss 10 which locates in a recess 11 in the body 1, so that the disc-shaped plate forms a projecting portion 12 carrying e handle 13 to rotate the locking plate. In the closed position of the lock, the portion 12 engages the edge of a door 14 and locks it against the frame 3. The door abuts against a buffer 15 secured to the frame and is held firmly in the locked position by a cam surface 16 held by a screw 17 passing through a hole in the plate and into the handle 13.

The lock may be moved from its closed position as shown in Figures 1 and 2 to the open position as shown in Figure 3 by grasping the handle 13 and rotating the plate 5 in either a clockwise or an anti-clockwise direction.

Secured or the outside of the frame 3 is a further disc-shapeS plate 18 having holes through which the screws 4 pass fixing it to the frame 3 and the body 1.

Located over the plate 18 is a cover plate 19 formed with an aperture 20 aligned with the indicating disc 9. By th:is means, an indication can be given as to the state of the lock, i.e. locked or unlocked, from the side of the frame remote from the handle 13 and plate 5. This is useful if, for example, the lock is fitted to the door of a toilet or changing cubicle when the indicating disc 9 can be appropriately marked "VACANT" and "ENGAGED".

The periphery of the cover plate has a flange 21 formed on opposite sides with projections 22 engaging in grooves 23 provided in opposite sides of the plate 18, one of which is shown in Figure 4.

The pivotal movement of the locking plate 5 is arrested in its closed and open positions by a pin 24 in the boss 10 sliding in an arcuate slot formed in the face of the boss 10. Means (not shown) may be provided for retaining the locking plate in its closed and open positions.

The centre of the indicator disc 9 is provided with a machined slot 25 which, in the locked position of the lock is arranged to be substantia:Lly vertical. The slot 24 is accessible through the aperture 20 in the cover plate 19 so that, in the event of an emergency, the lock can be unlocked from the outside by inserting a screwdriver into the slot 25 and turning the indicator disc 9 through 1800 which has the effect of turning the locking plate 5 to release the door.

Should the lock become jammed causing a further emergency, the lock mechanism can be speedily released by unclipping the cover plate 19 and pulling the indicator disc 9 and boss 8 from the shaft 6 releasing the locking plate and opening the door.

Turning now to Figures 5 to 9 of the drawings, in this embodiment: of the lock according to the invention a sleeve 31 is fitted over a cylindrical spacer body 32 which is secured to the frame 3 by two screws 4 passing through the frame. The spacer body 32 has a central cslindrical bore in which is located a hollow shaft 33 and which is clamped against the face of the spacer body 32 facing the frame 3 by a spring clip 34, a washer 35 being interposed on the shaft 33 between the spacer body 32 and the spring clip 34. The hollow shaft 33 has a square-sectioned hollow bore in which a shaft or drive peg 6 having a corresponding square cross-section is located, one end of the drive peg projecting from one end of the hollow shaft 33.

Mounted on the projecting end of the square drive peg 6 is a boss 8 carrying an indicating disc 9. The indicating disc 9 has appropriate markings to show the condition of the lock as with the embodiment shown in Figures 1 to 4 of the drawings.

A disc-sha?ed back plate 18 is secured to the frame 3 by means cf the screws 4 which also serve to secure the spacer body 32 to the frame 3. The indicating disc 9 is located in a circular recess in the back plate 18, a washer 36 on the boss 8 being interposed between the indicating disc 9 and the base of the recess in he plate 18. The boss 8 passes through an aperture in the back plate 18 and is fixed to the back plate 18 in a rotatable manner by a spring clip 37, a washer 38 on the boss 18 being interposed between the back plate 18 and spring clip 37.

The other end of the hollow shaft 33 projects from the spacer boss 32 and is stepped to receive a boss 10 which is eccentrically mounted on a disc-shaped locking plate 5. A washer 39 mounted on the said other end of the shaft 33 is interposed between the boss 10 and spacer body 32. The boss 10 is secured to the locking plate 5 by means of two screws 41 and the eccentric mounting of the boss 10 on the plate 5 ensures that the plate has a projecting portion 12 which carries a handle 13 secured to the plate 5 by a round headed screw 42. In the closed position of the lock shown in Figures 5 to 8, the portion 12 engages the edge of a door 14 and locks the latter against the frame 3. The door abuts against a buffer 15 secured to the frame and is held firmly in the locked position by the round head of the screw 42 as shown in Figure 6.The lock may be moved from the closed locking position to the open position shown in Figure 9 by grasping the handle 13 and rotating the plate 5 in a clockwise direction as viewed in Figures 5 and 9.

The pivotal movement of the locking plate 5 is arrested in its closed and open positions by a pin 43 projectinc radially from the side of the boss 10 and engageable with a first pin 44 in the closed position of the locking plate 5 and with a second pin 45 in the open posit:ion of the locking plate. As can be seen from Figure 6, the pins 44 and 45 project from an axial end of the spacer body 32.

Located over the back plate 18 is a cover plate 19 which is preferably secured to the back plate 18 by double-sided adhesive tape (not shown). The cover plate 19 is provided with an aperture 20 which is aligned with the indicating disc 9. Thus, as with the embodiment shown in Figures 1 to 4 of the drawings, an indication can be given as to the state of the lock from the side of the frame remote from the plate 5 and handle 13 so that if, for example, the lock is used for a toilet or changing cubicle, the indicating disc can be appropriately marked "VACANT" and "ENGAGED".

Again, as with the embodiment shown in Figures 1 to 4 of the drawings, the centre of the indicating disc 9 is provided with a slot 25 which is accessible through the aperture 20 in the cover plate 19 so that, in an emergency, the lock can be unlocked by inserting a screwdriver into the slot 25 and turning the boss 8 which has the effect of turning the drive peg 6 and the locking plate 5 to release the door.

In either of the above-described embodiments, the frame 3 may, in fact, comprise a pilaster or frame of the front of a changing cubicle or toilet although the lock according to the invention is capable of being put to other applications and uses.

It will he appreciated that although the lock, according to the invention, has been described and illustrated as fitted to a frame it can equally well be fitted to a door and locked against a frame surrounding the door.

Claims

1. A lock for securing a door in a frame or to a pilaster, said lock comprising a body member, which is securable either to a door or to a frame or pilaster, and a rotatable member pivoted in the body member between a locked and an unlocked position, wherein the rotatable member has a projecting portion which, on pivoting of the rotatable member to the locked position, is engageable with the frame or pilaster or the door to lock the door in a closed position.

2. A lock according to claim 1, wherein the body member is cylindrical with a central aperture through which a pivot for the rotatable member passes.

3. A lock according to claim 1 or claim 2, wherein the rotatable member is disc-shaped and has an eccentrically mounted pivot.

4. A lock according to any preceding claim, wherein the rotatable member has a handle to pivot said member between the locked and unlocked positions.

5. A lock according to any preceding claim, wherein the rotatable member has a cam-like surface on its projecting portion which is arranged to engage the door or tha frame or pilaster to lock the door firmly in the closed position.

6. A lock according to any preceding claim, wherein the rotatable member is eccentrically mounted on a shaft extending through the door or the frame or pilaster aad wherein an indicating disc is mounted on the shaft on the side of the door or the frame or pilaster remote from the rotatable member.

7. A lock according to claim 6, wherein the indicating disc is covered by a plate secured to the door or tte frame or pilaster, said plate having an aperture through which only a portion of the indicating disc is visible.

8. A lock according to any preceding claim, wherein means are provided for limiting pivoting movement of the rotatable member to 1800.

9. A lock according to claim 8, wherein said pivot limiting means comprise a first pin projecting from a boss on which the rotatable member is mounted and a pair of second pins projecting from the body member, each of said second pins being engageable by the first pin in a respective end pivoting position of the rotatable member.

10. A lock substantially as described herein with reference to Figures 1 to 4 of the drawings.

11. ' A lock substantially as described herein with reference to Figures 5 to 9 of the drawings.