Devices for restricting the movement of doors

Details Devices for restricting the movement of doors Devices for restricting the movement of doors

1992-06-29

1993-12-14

Moore, Richard E.

Closure fasteners

Clamps

Cam-operating means

292DIG15, 292DIG7, 292207, 292199, E05C 1750

Patent

active

052695735

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

This invention relates to a device for restricting the movement of a door and, more particularly, is concerned with such a device which can be actuated to prevent unwanted entry through the door.


BRIEF SUMMARY OF THE INVENTION

According to the present invention there is provided a device for restricting the opening motion of a door so as to prevent unauthorized entry via the door which device comprises: floor over which the door moves when being opened and closed, an operating position in which it extends through said opening to engage with the floor and prevent opening movement of the door with respect to the floor and a retracted position in which it is spaced from the floor, and positions.
If desired, the cam member may be a roller of circular section and mounted for rotational movement about an axis which is eccentric with respect to the roller so that when pivoted about the axis the roller protrudes through the opening so as to occupy the operating position and retracts from the opening to occupy the retracted position. Preferably, however, the cam member is a roller of elliptical or other eccentric cross section appropriately mounted about an axis in the housing so that on rotation about the axis it protrudes beyond or is retracted within the opening so as to occupy the aforementioned operating and retracted positions, respectively. In either case, since a part only of the roller surface needs to cooperate operate with the floor in use of the device, the cam member may be in the form of part only of a roller.
It is particularly advantageous for the arrangement to be such that the cam member is bi-stable whereby, when it is not in one or other of the operating and retracted positions, it tends to move to one or other of those positions.
The means for moving the cam member between its operating and retracted positions may be in the form of first and second members in the form of foot operated levers which, on operation, cause the cam member to rotate between its operating and retracted positions. Any suitable means may be provided to mechanically link the levers to the cam member to convert the movement of the levers to the desired rotational movement of the cam member. Thus, for example, rectilinear movement of the lever may cause it to engage with an abutment on the cam member so as to move it from one of its operating and retracted positions to the other. Alternatively, the lever and the cam member may be linked by a rack and pinion mechanism to effect the desired rotational movement.
The housing may be formed of a polycarbonate resin or other suitable synthetic plastics material having a high mechanical and impact strength. Alternatively, it may be formed of a suitable metal such as brass or aluminium which may optionally be coated with plastics material by means of a powder coating technique. The roller may be formed of a synthetic plastics material or a metal such as steel and is preferably provided with a slip-resistant surface.


BRIEF DESCRIPTION OF THE DRAWINGS

For a better understanding of the invention and to show how the same may be carried into effect, a detailed description follows with reference, by way of example, to the accompanying drawings wherein:
FIG. 1 is a vertical section through a first embodiment of a device in accordance with the present invention,
FIG. 2 is a view of a first side of the device of FIG. 1,
FIG. 3 is a view of a second side of the device of FIG 1,
FIG. 4 is a plan view of one of the operating levers of the device of FIGS. 1, 2 and 3,
FIG. 5 is a plan view of the other of the operating levers of the device of FIGS. 1, 2 and 3,
FIG. 6 is a perspective view from the rear face of a second embodiment of a device in accordance with the present invention wherein the cam member is in its operating position,
FIG. 7 is a perspective view from the bottom of the device of FIG. 6 wherein the cam member is in its retracted position, and
FIG. 8 is a side view of the cam member of the device 6 and 7.


DETAILED DESCRIPTION

Referring to FIGS. 1 to

REFERENCES:
patent: 160285 (1875-03-01), Royle
patent: 343298 (1886-06-01), Conn
patent: 1081634 (1913-12-01), Smith
patent: 1157376 (1915-10-01), Franchaerts
patent: 2325914 (1941-06-01), Moberg
patent: 2955860 (1960-10-01), Jacques
patent: 4163574 (1979-08-01), Cheyem
patent: 4514000 (1985-04-01), Cheyem et al.
patent: 4807914 (1989-02-01), Fleming et al.

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