Showing papers on "Bimetal published in 1971"

Electric toaster with improved heat-up cool-down bimetal timer

Abstract: An electric toaster with a heat-up cool-down bimetal timer wherein a separate bimetal timer control blade is positioned between a bimetal and its support for accurately controlling the pivot point of the bimetal during its heat-up cycle A calibration screw is threaded through an end portion of the bimetal control blade The calibration screw rests against a cam follower, and an improved arrangement is provided for adjusting the cam follower for reliably setting the toast brownness or color A unique manual ON-OFF mechanism is also provided for allowing or preventing the bimetal timer from automatically moving from its heat-up cycle to its cool-down cycle

Bimetal spinel surfaced electrodes

Abstract: ELECTRODES SUITABLE FOR ELECTROLYTIC PURPOSES, FOR EXAMPLE, AS ANODES IN THE ELECTROLYSIS OF AQUEOUS ALKALI METAL CHLORIDES, ARE DISCLOSED. THE ELECTRODES OF THIS INVENTION COMPRISE SPINEL OUTER SURFACES ON ELECTROCONDUCTIVE SUBSTRATES. THE ELECTRODES OF THIS INVENTION HAVE LOW OVERVOLTAGE AND ARE LONG LIVED IN THE ELECTROLYTIC CELL ENVIRONMENT.

Thermostatic vacuum positioner

Abstract: An automatic temperature control system for air conditioning the passenger compartment of an automobile utilizing a spirally wound bimetal to sense the temperature of air which is drawn through an opening in the dashboard and through an ambient temperature compensating heat exchanger. The center of the spiral bimetal is supported by a shaft while the peripheral end of the bimetal coacts with an air bleed valve assembly which is connected to a vacuum pressure source and a vacuum motor to position an air damper for producing desirable air temperatures in the passenger compartment. The air bleed valve is movable with respect to the bimetal in response to settings of a dash mounted control adapted to be manually set for a temperature desired in the passenger compartment. A feedback mechanism which operates in correspondence to the position of the damper rotates the interconnected shaft and bimetal to re-establish a desirable spacial relationship between the end of the bimetal and the air bleed valve assembly after a setting change of the control assembly.

Stepped bimetallic shadow mask mounting element

Abstract: In a shadow mask assembly for use in a color picture tube of the type including a frame, a shadow mask supported by the frame, a bimetal element secured to the frame and a leaf spring secured to the bimetal element, the bimetal element comprises an upper side portion secured to the frame, a lower side portion secured to the leaf spring and a flat step intermediate the upper and lower sides, the width of the intermediate flat step gradually varying from one end to the other end of the step.

Copper backed electrical contact

Abstract: A copper backing is formed on a silver-cadmium oxide contact by first forming a bimetal strip having a thin layer of substantially pure silver and copper layer. The bimetal strip is secured at at least one end to a billet of the contact material, to retain them together during subsequent operations, with the silver surface of the bimetal strip against a surface of the billet of contact materials. The composite is then rolled to a substantial reduction of thickness, of the order of at least 50 percent to bond the silver surface of the bimetal to the contact material. This produces a tri-layer contact with the layers fully integrated, consisting of the main contact material section, an intermediate silver layer and a copper backing layer.

Time delay switch

Abstract: A switch having a bimetal latch for locking a resilient contact in a closed circuit position, and a heating coil for activation of the latch to release the contact An integral ambient temperature responsive switch energizes the coil periodically to stabilize the temperature of the bimetal

Bimetal capable of deformation

Abstract: A BIMETAL IS DISCLOSED THAT CONSISTS ESSENTIALLY OF A FIRST METALLIC ELEMENT THAT UNDERGOES TOW PHASE CHANGES AT TWO PRESELECTED TEMPERATURES. THE FIRST ELEMENT IS METALLURGICALLY BONDED TO A SECOND METALLIC ELEMENT THAT DOES NOT UNDERGO PHASE CHANGES UNDER THE OPERATING TEMPERATURES AND HAS A COEFFICIENT OF THERMAL EXPANSION WHICH APPROXIMATELY MATCHES THE FIRST ELEMENT THROUGH THE RANGE OF THE PRESELECTED TEMPERATURES. THE BIMETAL IS DEFORMED A PREDETERMINED AMOUNT BY SUBJECTING THE BIMETAL TO ONE OF THE TRANSFORMATION TEMPERATURES. AFTER DEFORMATION THE BIMETAL REMAINS IN THE DEFORMED STATE WITHOUT AN APPRECIABLE CHANGE UNTIL THE BIMETAL REACHED S THE OTHER PHASE CHANGE TEMPERATURE.

Heat motor operated gas valve construction and system and method

Abstract: A heat motor operated gas valve construction having a housing for the passage of gaseous fuel therethrough and a bimetal member for operating a valve member of said housing and carrying an electrical heater that is utilized to cause warpage of the bimetal member to move the valve member to one operating position thereof when the heater is energized to heat the bimetal member Means are disposed between the bimetal member and the electrical heater with such means not acting as a catalyst with the gaseous fuel to prevent the bimetal member when heated from acting as a catalyst with the gaseous fuel to ''''crack'''' the fuel and cause carbon to build up between the bimetal member and the heater

Ambient compensated time delay switch

Abstract: A switch having a bimetal latch for locking a movable spring contact in closed circuit with a second contact, and a heating coil for activating the latch to release the spring contact. A second bimetal element engages and opposes the bimetal latch and thereby counteracts the torque developed in the bimetal latch by changes in the ambient temperature.

Thermostatic vacuum valve

Abstract: A temperature responsive vacuum modulating valve having an enclosed bimetal temperature sensitive element supported at both ends for improved operation and calibration, the overall valve design exhibiting improved thermal responsivity.

Thumbwheel vacuum thermostat

Abstract: An automotive air temperature control system including a vacuum regulator which is responsive to the air temperature of the passenger compartment to vary the strength of vacuum applied to a multiposition vacuum motor which is connected to an air damper. The vacuum regulator includes a bleed port with a valve controlled by the combination of a main bimetal element and a compensator bimetal element whose relative response to changes in air temperature is in opposition to one another. The action of the compensator tends to reduce temperature overshoot caused by thermal delay of single bimetal regulators. Cam means connected to a thumbwheel dial are provided for manually setting the vacuum regulator for a range of predetermined temperatures.

Bimetal thermal gauge having zero and full scale calibration means

Abstract: A bimetal thermal gauge having a U-shaped bimetal strip which is deformed when heated and a pointer which is rotatable about a stationary shaft and which is positioned relative to a graduated scale, the pointer being calibrated for alignment with respect to upper and lower limit lines of the scale by moving the bimetal strip in two directions. The alignments with respect to the lower and upper limits can be achieved independently from each other.

Frost anticipating bimetal control for an air conditioner

Abstract: An air conditioner for cooling room air having a separate electrical apparatus compartment within the air conditioner housing completely enclosing a temperature responsive device such as a bimetal thermostat element within the compartment. Means are provided for establishing a subsidiary flow path for room air over the thermostat and separate from the main room airstream that is directed over the air conditioner evaporator. The subsidiary airstream is directed through the electrical apparatus compartment in heat exchange relation with the temperatureresponsive device and then to the exterior of the room rather than being returned to the room. In a preferred embodiment an end portion of the evaporator is arranged in the subsidiary air flow path in heat exchange relationship with the subsidiary airstream so as to effect the temperature of this air. Frost buildup on the air conditioner evaporator is anticipated by a lowering evaporator temperature which is reflected at the unit thermostat as a result of room air passing over the end portion of the evaporator in its passage to the thermostat.

Cold welding process for metals

Abstract: The surfaces to be welded are cleaned by sputtering and pressed together before final cold welding. The pieces to be welded are kept in a vacuum of less than 10-5 mm Hg. residual stress from the beginning of the cleaning process to completion of welding. Specif. the cleaning is effected by cathodic sputtering etc. The process is particularly used to produce bimetal contact rivets.

Plunger type relay

Abstract: A plunger type relay for locking the door of a washing machine. Such a relay includes first and second bimetal strips, at least one heating winding for heating the bimetal strips, a fixed contact and a movable contact actuatable by the second bimetal strip to co-operate with the fixed contact to short circuit the heating winding.

Thermostat with stable bimetal support

Abstract: A line-voltage thermostat is described having a snap-switch proportioned to carry heavy line current to an electric room heater. The snap-switch is mounted on a baseplate which is to be mounted on a wall box. The screws used to mount the baseplate have long shanks so as to be accessible well forward of the baseplate. The mounting screws extend through arched straps which are sheared free of the baseplate except at their ends. This avoids upset of the calibration due to deformation of the baseplate during tightening of the mounting screws, considering mainly the area of the baseplate where the switch is mounted. The thermostat has a bimetal held at a hinge point by a singleunique spring. Fixed ears project toward the bimetal to limit the extent the bimetal can be depressed, protecting the switch from damage and from calibration error due to excessive manual force on the bimetal when the thermostat is being installed or serviced.

Thermostatically controlled heating implement

Abstract: A thermostatically controlled heating implement in which one surface of a formed sheet of metal defines the heating surface of the implement and in which the formed sheet forms one element in a bimetal bow-type thermomechanical switch to control the heating temperature of the implement.

Thermostat with overlapped bimetal control strips therein

Abstract: A thermostat, thermal protector, or the like is provided including a shunt strip extending into the casing in cantilever form and where a pair of opposed contacts are usually carried by the free end of the shunt arm and the inside wall of the case in opposed relation. A bimetal strip is secured as a cantilever and its free end overlaps with the free end of a second bimetal strip secured to the shunt arm adjacent the free end thereof and extending towards the secured end of the first bimetal strip to overlap the first bimetal strip and normally have the free ends thereof in pressure contact.

Temperature compensation for magnetostrictive bimetal

Abstract: Temperature compensation which renders magnetostrictive bimetal insensitive to moderate temperature changes is suggested in the way of adding a third metallic strip. The formulation to determine the thickness of the third metal is carried out, the mechanics and sensitivity of the composite trimetal are discussed.