Abstract:
Hardware that improves the safety of operating sectional doors that use torsional coil springs to facilitate door movement. A rotor assembly with centrifugally activated throw-out latches is affixed to the rotating shaft that bears the torsional coil springs. When a spring breaks, the shaft rotates rapidly as cables supporting the door unwind. Rapid rotation causes centrifugal force to bias the latches to an outer position in which they strike a trigger plate, allowing a pawl to move into a position in which the pawl blocks further rotation of the rotor, thus halting the descent of the sectional door. Raising the sectional door manually moves the latches, trigger plate, and pawl to their original position, disengaging the present invention and permitting the door to be lowered slowly without danger of injury.
Abstract:
The present invention is a door drop stop system designed to require a minimal amount of time and modification to install in an existing door system. It is effective with all overhead doors which employ a central axle; such overhead doors are in widespread use in residential, commercial, and vehicular applications. In addition, other configurations of the door drop stop system are effective with slab doors, bifold doors, and rollup doors. The present invention will reduce or eliminate property damage and personal injury resulting from a failure of a component of the door or its counterbalance system.
Abstract:
A controller for controlling a motor and other functions in a commercial door or barrier operator is described. The controller includes a unique motor start circuit for starting an AC motor which employs two dual-pole-dual-throw (DPDT) relays for activating the start coil in combination with a single triac for activating the main coil of the motor, eliminating dv/dt sensitivity. A motor start control for a door or barrier operator includes a speed governor integrated onto the controller for detecting when to shut off AC power to the start coil in a single phase motor. The integrated speed governor uses an RPM sensor for detecting the speed of the operator's limit shaft coupled to software run by the processor. Switches for operating open, close, stop and learn functions are located on the controller to facilitate installation, maintenance and programming by a service provider at the door operator. In addition, a cycle counter provides a warning when the number of barrier movements equals a predetermined, programmable number of movements.
Abstract:
A device for closing a sliding screen door is disclosed. The inventive device includes a housing mountable proximal to a sliding screen door. A retractable cable resiliently extends from the housing and couples with the sliding screen door to effect closing of the door subsequent to opening thereof.
Abstract:
A fluid free damper, comprising a spindle member; housing means mounted for relative eccentric rotation with respect to the spindle member; and engagement means interposed between the spindle member and the housing means for rotation along with one of the housing means and the spindle member with respect to the other one of the housing means and the spindle member so as to be deformably compressed between the spindle member and the housing means and thereby generate a resistive damping force between the housing means and the spindle member in response to the eccentric rotation of the one of the housing means and spindle member with respect to the other one of the housing means and the spindle member.
Abstract:
A power drive system for a sliding door, such as those employed on van type vehicles, enables a positive drive powered operation of the door by a control switch remote from the door and a programmed electronic control unit while accommodating manual operation of the door without mechanical interference or resistance from the drive or altering of the drive control program. A push/pull cable connected to the door is in positive meshed engagement at all times with a rotary drive gear whose rotative displacement from a rest position is continuously transmitted to the electronic control unit as a door position input signal. During powered operation of the door, the control unit is programmed to actuate or control a reversible drive motor or associated devices when the door is at selected positions along its path of movement. The drive motor is mechanically coupled to the drive gear via a normally disengaged clutch which is automatically engaged to establish a positive mechanical drive connection between the motor and drive gear only while the motor is in operation.
Abstract:
An electrically powered pet door assembly for use in a home or building. Each assembly includes a frame which is secured to an exterior surface of a building, a panel slidably mounted within parallel tracks of the frame, a rotatable and translational drive assembly for vertically raising the panel, a centrifugal brake for controlling the speed of the vertical opening or closing of the panel and a treadle for activating the rotational and translational drive assembly.
Abstract:
A pair of slotted, sector-shaped centrifugal weights 7, 8 are radially slidable on posts 5, 6 upstanding from a disk 4 mounted on the drive shaft 2 of a reversible electric motor 1. A cup member 11 carrying a pinion gear 13 is rotatably journalled on the shaft, and includes a cylindrical wall 11a surrounding the weights. A reduction gear mechanism 12 transmits the rotation of the pinion gear to a pivotally mounted sector gear 16, to which a linearly movable actuating rod 17 is connected. Alternatively, a plurality of sector-shaped weights 27 may be accomodated in similar shaped cavities between a pair of radially partitioned discs 24a, 24b.
Abstract:
A motor driven revolving door operating mechanism including a main gear connected to the revolving door shaft, a centrifugal brake assembly, a gear train assembly connected between the main gear and centrifugal brake assembly and a drive motor connected to the gear train assembly, the motor being disposed in the same horizontal plane as the main gear; the main gear, centrifugal brake assembly, gear train assembly and motor all being positioned within a housing in spaced, parallel, closely adjacent horizontal planes to thereby form a low-profile motor driven operating mechanism adapted for selective installation in either an overhead or floor-type revolving door installation.
Abstract:
A door operator of the fireproof door comprises a force applying end for releasing the reel of a door curtain, and a loading end for sustaining the weight of the door curtain. The rotary shaft comprises an internal (central) shaft and a plurality of external shaft coupled to each other via a clutch mechanism. The force applying end and the loading end act on the internal shaft and the external shaft respectively. A torsion spring brake mechanism is provided to resist the potential energy of the loading end by varying the inner diameter of the torsion spring so as to constantly restrain the rotary shaft from rotating, or to release the rotary shaft when the brake mechanism is subjected to an external force from the force applying end.