Door security system
AssigneeRDS Innovations Limited
InventorRobert David Simpson
Life of this patent
Estimating the term…
Abstract
A security system for constraining the degree to which a door leaf (11) may be opened; the system being selectively activated from an inoperative position in which it does not block the opening and closing of the door leaf (11), into and out of an operative position in which it does so block the opening of the door leaf (11) beyond a predetermined constrained degree; the system being characterized in that it comprises: a chassis (14) adapted for mounting, in use, adjacent an opening edge of a door leaf (11); an electric actuator (17, 28, 36) mounted on the chassis (14); an arm (18, 29, 37) operating in conjunction with said actuator (17, 28, 36) so that the actuator drives the motion of said arm (18, 29, 37) without any lost motion mechanism.
Claims11
In a security system for constraining the degree to which a door leaf may be opened of the type having an inoperative position in which it does not block the opening and closing of the door leaf, and an operative door leaf blocking position in which it does so block the opening of the door leaf beyond a predetermined constrained degree and means for selectively activating said system for effecting movement between said inoperative and operative position, the improvement comprising:
- a chassis;
- means for mounting said chassis adjacent an opening edge of said door leaf;
- an electric actuator comprising a motor having a rotatable output shaft;
- means for mounting said electric actuator on said chassis;
- an arm operating in response to movement of said output shaft of said actuator, whereby said actuator drives said arm without any lost motion mechanism into and out of said operative position, at least a portion of said arm when in said operative position is moved into a position beyond said chassis, where said arm acts as a barrier to said door leaf being opened beyond a predetermined degree;
- and
- means for mounting said arm directly on said output shaft of said motor, so that when said motor shaft rotates, said arm rotates with it, and wherein said arm movement into and out of its operative door leaf blocking position is effected solely by the rotation of said output shaft with essentially no other arm-urging means being deployed.
In a door installation of the type comprising a door leaf and a security system for constraining the degree to which the door leaf may be opened, said system comprising means for selectively activating movement of said system from an inoperative position in which it does not block the opening and closing of the door leaf, into and out of an operative position in which it does so block the opening of the door leaf beyond a predetermined constrained degree, the improvement comprising:
- a chassis;
- means for mounting said chassis adjacent an opening edge of said door leaf;
- an electric actuator comprising a motor having a rotatable output shaft;
- means for mounting said electric actuator on said chassis;
- an arm operating in response to movement of said output shaft of said actuator, whereby said actuator drives the motion of said arm without any lost motion mechanism into and out of said operative position, at least a portion of said arm when in said operative position is moved into a position beyond said chassis, where said arm acts as a barrier to said door leaf being opened beyond a predetermined degree;
- and
- means for mounting said arm directly on said output shaft of said motor, so that when said motor shaft rotates, said arm rotates with it and wherein said arm movement into and out of its operative door leaf blocking position is effected solely by the rotation of said output shaft with essentially no other arm-urging means being deployed.
Dependencies are inferred from the claim text.