Abstract: An improved vitreous cutter having a housing with two halves connected together by tapered pins on one half fitting into holes on the other half with a proximal end, a distal end, an internal transverse bore and a longitudinal bore intersecting the transverse bore and penetrating the housing at the proximal and distal ends, a pair of inlets in the proximal end of the housing in fluid communication with opposite ends of the transverse bore for allowing pressurized air to be introduced into the transverse bore, a thermoplastic piston slideably received in the transverse bore having a toothed, longitudinal slot, a stainless steel stationary outer cutting tube having a cutting port on a distal end, a stainless steel rotatable inner cutting tube telescopically received in the outer cutting tube having a cutting port on a distal end and penetrating the proximal end of the housing to form a suction port, a flexible seal between the inner cutting tube and the outer cutting tube and a pinion gear on a medial section o

Abstract: A surgical instrument is provided which has two concentric transfer tubes: an outer tube and an inner tube. One tube is used for aspiration of fluid, the other for infusion of fluid. The concentric tubing section has proximal and distal ends, the distal end being tapered and having openings for simultaneous aspiration and infusion eye fluid. On the proximal end, the inner transfer tube extends a proximal length greater than the outer transfer tube. The concentric inner and outer transfer tubes are both connected to independent supply tubes. The proximal end of the inner transfer tube, being longer than the outer transfer tube, pierces and protrudes through the wall of the flexible fluid tube connected to the proximal end of the outer tube. This protrusion provides a place on the inner transfer tube for its own independent connection to a supply tube. The tubing assembly is contained within and supported by an elongated, generally tubular housing.

Abstract: A user, touch actuable capacitive switch for changing the level of an output signal to an electrical circuit. The switch includes an external, user touchable capacitive plate formed on a first dielectric panel and two internal capacitive plates formed on a second dielectric panel affixed to the first flexible dielectric panel, the two internal capacitive plates being oppositely disposed from said external capacitive plate on opposite sides of said second dielectric panel. Electrically conductive paths on the second dielectric panel interconnect the internal capacitive plates to the electrical circuit. A trim tab formed on the second dielectric panel permits the adjustment of the change of level of the output signal upon actuation of the capacitive switch.

Abstract: A user, touch actuable switch panel of the capacitive type that includes one or more touch actuable capacitive switches, each switch including at least two capacitive plate elements formed on a dielectric panel. Conductive paths formed on the dielectric panel interconnect the capacitive plate elements to a source for applying signals to the capacitive plate elements forming said capacitive switches and sensing a resulting change in signal level when a selected switch is actuated by the user. Trim tabs formed on the dielectric panel are provided to balance the effect of stray capacitance between the conductive paths and the capacitive plate elements to maintain the level of change of signal at a determined value upon the actuation of each of said one or more capacitive switches.

Abstract: There is disclosed a telemetric temperature probe for telemetry of temperatures of comestibles which are heated within microwave ovens. The probe includes a temperature responsive circuit for generating a signal responsive to the temperature of the comestible and an electromagnetic wave broadcasting circuit for telemetric transmission of the signal to a remote receiver which can conveniently be incorporated in the microwave oven and coupled to its control circuit. The probe is provided with facilities to derive power necessary for its operation from the microwave energy generated by the oven and includes, for this purpose, an antenna to receive microwave energy, a rectifier circuit for developing direct current power therefrom and a voltage regulation circuit to produce a source of direct current of controlled voltage for operation of the temperature responsive circuit and the broadcasting circuit.

Abstract: Electrical heater construction having a substantially closed housing containing controls therein and having a bracket unit carrying electrical heaters externally thereof, the housing having connectors detachably interconnected to the heaters externally to the housing and electrically interconnecting the heaters to the controls within the housing to be operated thereby. The housing has an externally accessible detachable arrangement and the bracket unit has a detachable arrangement detachably interconnected to the detachable arrangement of the housing in a manner that is accessible externally to the housing whereby the detachable arrangement of the bracket unit can be detached from the detachable arrangement of the housing without access to the interior of the housing so that the heaters can be detached from and/or attached to the housing without requiring the opening of the housing.

Abstract: There is disclosed a method, and apparatus for practicing the method, of controlling microwave cooking. A temperature measuring probe monitors the temperature of a comestible during cooking which is interrupted at a predetermined time in the cooking cycle and the comestible is permitted to equilibrate to a true temperature. This true temperature is detected and the cooking is resumed in a manner responsive to the detected, true temperature, e.g., the input power level is selected based on the differential value between the true and desired final temperatures, whereby the rate of cooking is reduced when the true temperature is close to the final temperature to permit the comestible to coast to the final temperature, insuring against over-cooking. The direction of the temperature error between the instantaneous and true temperatures can also be used to control the cooking process as, for example, the power level can be reduced if the instantaneous temperature is less than the true temperature.

Abstract: An electrical heater construction having a frame carrying electrical heaters and a movable drawer-like unit that is adapted to interconnect power source leads to the heaters when the unit is in one position thereof relative to the frame, the frame carrying a movable latch member that is operatively associated with the unit to latch the unit in an out position thereof when the unit is moved out of the one position thereof to the out position to disconnect the power source leads from the heaters whereby the unit cannot be moved in any direction from the out position thereof until the unit is unlatched from the latch member by the latch member being manually moved to an unlatching position thereof.

Abstract: Electrical heater construction having a substantially closed housing containing controls therein and having a bracket unit carrying electrical heaters externally thereof, the housing having connectors detachably interconnected to the heaters externally to the housing and electrically interconnecting the heaters to the controls within the housing to be operated thereby. The housing has an externally accessible detachable arrangement and the bracket unit has a detachable arrangement detachably interconnected to the detachable arrangement of the housing in a manner that is accessible externally to the housing whereby the detachable arrangement of the bracket unit can be detached from the detachable arrangement of the housing without access to the interior of the housing so that the heaters can be detached from and/or attached to the housing without requiring the opening of the housing.

Abstract: An electrical heater construction having a frame carrying electrical heaters and a movable drawer-like unit that is adapted to interconnect power source leads to the heaters when the unit is in one position thereof relative to the frame, the frame carrying a movable latch member that is operatively associated with the unit to latch the unit in an out position thereof when the unit is moved out of the one position thereof to the out position to disconnect the power source leads from the heaters whereby the unit cannot be moved in any direction from the out position thereof until the unit is unlatched from the latch member by the latch member being manually moved to an unlatching position thereof.

Abstract: An electrical unit having a frame provided with a terminal means and a bus-bar means electrically interconnected to the terminal means for transmitting electrical current between the terminal means and desired devices electrically interconnected to the bus-bar means, the bus-bar means having a pair of bus-bar sections spaced from each other and having a selector arrangement for electrically interconnecting the bus-bar sections together when the selector arrangement is in one position relative to the frame and for electrically disconnecting the bus-bar sections from each other when the selector arrangement is in another position relative to the frame. The selector arrangement comprises an electrical connector that wedges against both of the bus-bar sections when said selector means is in the one position thereof and a spring is operatively associated with the electrical connector to urge the same into its wedging relation.

Abstract: An electrical furnace has a plurality of electrical heaters and a control unit carried by a frame. A rigid lead unit is carried by the frame and has rigid lead means directly and electrically interconnected to terminals of the heaters and terminals of the control unit, the rigid lead unit itself having terminals for electrically interconnecting the rigid lead means to power source leads whereby the power source leads are directly and electrically interconnected to the terminals of the heater and the control unit by the rigid lead means without the need for auxiliary wiring. The control unit includes an electrical sequencing switch construction having a plurality of electrical switches for sequentially operating the heaters, the switch construction having a temperature sensing unit operatively interconnected to the switches for moving and holding the same in open conditions thereof when the temperature sensing unit senses a high temperature condition of the heaters.

Abstract: A motor control circuit for controlling the operation of a motor having main running-speed windings and also start-up windings includes a fixed time delay circuit to energize the main windings after a time delay following energization of the startup windings. In addition a lock-out circuit is provided to prevent re-start of the circuit following a particular fault condition.

Abstract: A motor protection circuit has a current sensing means connected in series with a contactor winding energization circuit for sensing current flow to initiate operation of a delay after break circuit or to maintain an oil pressure protection circuit unoperated.

Abstract: In a protection circuit for a device such as a motor, the unused half or a dedicated half of an AC signal on the secondary of an isolation transformer is sensed to disconnect the AC line from the device if the line voltage is abnormal, such as being too low. Conveniently the protection circuit is employed in a complete motor protection system which may include a thermal protection circuit, a low oil pressure protection circuit, and/or a time delay circuit to prevent start-up too soon after shut-down.

Abstract: A heating system employs a thermostat fuel control device and a safety fuel control device, such as a safety valve retained against a closing bias wherein a bulb contains an expandable fluid for releasing the safety valve, responding to an overheat condition of the heating system. The safety fuel control device can be employed as an addition to the normal recyclic cutoff.

Abstract: There is disclosed a mechanical transducer which is particularly adapted for use as an actuator for a damper in a ventilating system. The transducer comprises a housing having a motor drive unit with a rotary shaft output therefrom carried on one wall of the housing and in driving connection to a lead screw which is rotatably carried by thrust bearing means on the wall of said housing. A traveling nut member is engaged on the lead screw and a tubular work output member extends through an opposite wall of the housing in generally co-axial alignment with the lead screw. The inboard end of the tubular member is secured to the traveling nut member whereby the lead screw it totally enclosed. The outboard end of the tubular member bears a work-receiving means which, preferably, is a tapped plug for removable attachment to an actuating lever of the damper unit.

Abstract: A motor protection circuit employs a resistance bridge circuit with one side having multiple branches containing temperature responsive resistances for sensing an overheat condition in the motor. Semiconductor voltage sensing devices, such as high gain amplifiers, are responsive to voltages between a standard sensing node and each of the sensing nodes in the multiple branched side of the bridge circuit. Logic facilities respond to any of the sensing devices to operate switching facilities controlling energization of the motor. Additionally, the protection circuit may include a lubricating oil pressure responsive control which is not affected by power loss or spurious signals, and which may be controlled by the operation of a motor control switch.

Abstract: A contactor or switch to an electrically powered unit, such as a motor, is controlled by a condition responsive circuit which may include facilities for changing the response condition of the circuit and/or facilities responsive to several conditions, such as temperature and excessive current.

Abstract: A burner system employs a fuel control which supplies fuel flow to a pilot burner and a main burner and which energizes an electric igniter adjacent the pilot burner for igniting the pilot burner. A valve between the control and the main burner is opened when the pilot burner flame is sensed to allow passage of fuel to the main burner which is ignited by the pilot burner. The pilot burner flame is sensed by a bulb adjacent the pilot burner containing a charge of gas and an adsorbent carbonaceous material which is a decomposed compound of carbon and a non-carbon component wherein the non-carbon component has been removed leaving a porous structure with cavities of sufficient size to receive and adsorb the gas.