Abstract: In one embodiment, a braking apparatus includes a pair of brake shoes, a cam follower connected to at least one of the shoes, a compressible spring connected to the cam follower, and an actuation assembly including a motor, a ball screw and an electromagnetic clutch. The braking apparatus is operative to transition from a brake applied position where the brake shoes are closed and a brake release position where the brake shoes are separated. When the braking apparatus is in the brake release position, a brake application may be commenced to close the shoes by power no longer being supplied to the electromagnetic clutch. Additionally, when the braking apparatus is undergoing a brake release cycle to separate the brake shoes, the brake application cycle may also be commenced prior to completion of the brake release cycle when power is no longer supplied to the electromagnetic clutch and the motor.

Abstract: In one embodiment, a braking apparatus includes a pair of brake shoes, a cam follower connected to at least one of the shoes, a compressible spring connected to the cam follower, and an actuation assembly including a motor, a ball screw and an electromagnetic clutch. The braking apparatus is operative to transition from a brake applied position where the brake shoes are closed and a brake release position where the brake shoes are separated. When the braking apparatus is in the brake release position, a brake application may be commenced to close the shoes by power no longer being supplied to the electromagnetic clutch. Additionally, when the braking apparatus is undergoing a brake release cycle to separate the brake shoes, the brake application cycle may also be commenced prior to completion of the brake release cycle when power is no longer supplied to the electromagnetic clutch and the motor.

Abstract: There is disclosed an automatic door installation 10 comprising: a door opening 16; and an optical door sensor comprising: a plurality of transmitters 30 arranged in a transmitter array 22, each transmitter 30 being configured to transmit an optical beam across the door opening along a respective beam path; a plurality of receivers 32 arranged in a receiver array 24, each receiver 32 being configured to generate a receiver output signal based on an intensity of light received. The plurality of receivers 32 are arranged in at least one set of receivers, the receivers of the or each set being linked so that the respective sensor output signals are combined into a compound signal for the respective set.

Abstract: There is disclosed an automatic door installation 100 configured to determine the presence of an obstacle 150 in one or more detection zones remote from a door opening, comprising: at least a first door 104 slidable in a door opening along a horizontal door axis from an open configuration to a closed configuration during a door closing operation; a plurality of transmitter-receiver pairs, each transmitter-receiver pair comprising: a transmitter 116 for transmitting a beam 140 and a receiver 118 for receiving a reflection of the beam, wherein one of the transmitter 116 and the receiver 118 is coupled to the first door so that, in use, the transmitter and receiver move closer together during the door closing operation; wherein the transmitter 116 defines a transmitter axis 120 corresponding to the optical axis of the beam; wherein the receiver 118 has a field of view 142 for receiving the beam, which is oriented around a receiver axis; and wherein the transmitter axis 120 and the receiver axis 122 are configure

Abstract: There is disclosed a method of testing an optical door sensor 100 having an emitter 102 for emitting a light signal 104 and a receiver 106 for detecting the light signal 104, the optical door sensor 100 having at least one sensor operating parameter and further having a baseline state in which the receiver 102 can detect a light signal from the emitter 106. The method comprises setting the optical door sensor in an offset state 204, 304, in which a sensor operating parameter is offset from a baseline setting by an offset amount, the baseline setting corresponding to the baseline state of the optical door sensor; conducting a signal test 206 with the optical door sensor in the offset state; and generating an alert 216 when the signal test result is negative for the offset state and the offset amount is less than or equal to a limit margin. The signal test comprises: emitting a light signal from the emitter 208 and determining whether the light signal is detected by the receiver 210.

Abstract: There is disclosed an automatic door installation 10 comprising: a door opening 16; and an optical door sensor comprising: a plurality of transmitters 30 arranged in a transmitter array 22, each transmitter 30 being configured to transmit an optical beam across the door opening along a respective beam path; a plurality of receivers 32 arranged in a receiver array 24, each receiver 32 being configured to generate a receiver output signal based on an intensity of light received. The plurality of receivers 32 are arranged in at least one set of receivers, the receivers of the or each set being linked so that the respective sensor output signals are combined into a compound signal for the respective set.

Abstract: There is disclosed an automatic door installation 100 configured to determine the presence of an obstacle 150 in one or more detection zones remote from a door opening, comprising: at least a first door 104 slidable in a door opening along a horizontal door axis from an open configuration to a closed configuration during a door closing operation; a plurality of transmitter-receiver pairs, each transmitter-receiver pair comprising: a transmitter 116 for transmitting a beam 140 and a receiver 118 for receiving a reflection of the beam, wherein one of the transmitter 116 and the receiver 118 is coupled to the first door so that, in use, the transmitter and receiver move closer together during the door closing operation; wherein the transmitter 116 defines a transmitter axis 120 corresponding to the optical axis of the beam; wherein the receiver 118 has a field of view 142 for receiving the beam, which is oriented around a receiver axis; and wherein the transmitter axis 120 and the receiver axis 122 are configure

Abstract: A method is disclosed of operating an automatic door installation comprising door sensor equipment including a door sensor. The automatic door installation is operable in at least a standard mode, in which the door sensor equipment conducts an obstacle check to determine whether an obstacle is present according to a first obstacle check procedure, and a contingency mode, in which the door sensor equipment conducts the obstacle check according to a different second obstacle check procedure. The method includes the steps of evaluating an operating condition of the automatic door installation; determining whether the operating condition lies within a standard operating range; and operating the automatic door installation in the contingency mode when the operating condition lies outside a respective standard operating range.

Abstract: There is disclosed a method of testing an optical door sensor 100 having an emitter 102 for emitting a light signal 104 and a receiver 106 for detecting the light signal 104, the optical door sensor 100 having at least one sensor operating parameter and further having a baseline state in which the receiver 102 can detect a light signal from the emitter 106. The method comprises setting the optical door sensor in an offset state 204, 304, in which a sensor operating parameter is offset from a baseline setting by an offset amount, the baseline setting corresponding to the baseline state of the optical door sensor; conducting a signal test 206 with the optical door sensor in the offset state; and generating an alert 216 when the signal test result is negative for the offset state and the offset amount is less than or equal to a limit margin. The signal test comprises: emitting a light signal from the emitter 208 and determining whether the light signal is detected by the receiver 210.

Abstract: There is disclosed a method of operating an automatic door installation comprising door sensor equipment including a door sensor 100, the automatic door installation being operable in at least a standard mode, in which the door sensor equipment conducts an obstacle check to determine whether an obstacle is present according to a first obstacle check procedure, and a contingency mode, in which the door sensor equipment conducts the obstacle check according to a different second obstacle check procedure. The method comprises: evaluating an operating condition of the automatic door installation; determining whether the operating condition lies within a standard operating range; and operating the automatic door installation in the contingency mode when it is determined that the operating condition lies outside the respective standard operating range.

Abstract: A method of treating sensitive teeth includes (1) attaching a fluoride releasing glass composition to a person's tooth, and (2) allowing fluoride to be slowly released over time in order to reduce chronic and/or acute tooth sensitivity. A preferred glass composition comprises the general empirical formula given below, expressed in approximate weight percent of the element: P: 16-24, F: 5-30, O: 20-40 and at least one of Na, K, Li, or Al in an amount up to a total of about 40 weight percent and optionally, up to about 5 weight percent of boron and/or silicon.