Showing papers on "Bimetal published in 1983"

Two-layer material

Abstract: Two-layer materials in the form of bimetal are known per se. By the joining together of two layers of materials with different coefficents of thermal expansion, bimetal strips assume different curvatures with changing temperatures and can thus be used as a temperature-dependent closed-loop or open-loop control element. However, the possible uses of bimetal are relatively restricted because of its other properties. Accordingly, the inventor has sought other two-layer materials which can be used for similar applications but with a greater scope. He has developed two-layer materials in which at least one layer consists of plastic and the other consists of a non-metallic material with a coefficient of thermal expansion which is as different as possible. In this case the two layers must have a high modulus of elasticity. The expansion coefficient of one layer must be zero or approximately zero, whereas the other layer has a high expansion coefficient. At least one of the layers must additionally have a shape-memory capacity. It has been found, surprisingly, that two-layer materials of this kind, in particular those with incorporated carbon fibres, have extremely good properties in the desired direction, so that they open up a multiplicity of fields of application which are closed to bimetallic closed-loop or open-loop control elements.

Bimetallic protection switch

Abstract: 1. A bimetal protective switch, which in response to a temperature rise above a preselected value is opened by a bimetal element and which is held in an open state by a resistor that bypasses the switch, characterized in that the resistor (19) is a thick-film resistor and that the contact spring (10), the movable switch contact (11) and the fixed switch contact (12) of the bimetal protective switch are disposed on one side of an electrically insulating carrier (1) whereas the resistor (18) is disposed on the opposite side of the insulating carrier (1) and the latter is apertured between the resistor (18) and the contact spring (10).

Three-layer metal laminate with bimetallic effect, and the application of this laminate in cooking vessels

Abstract: A three-layer metal laminate consists of only two different metals with different coefficients of thermal expansion. The two outer layers consist of the same metal, yet of different thicknesses so that, on heating the metal laminate there arises a cotrolled bimetal effect which is utilized in thin-based vessels for hot food, to maintain the base flat on being heated.

Wavelength split multiple circuit

Abstract: PURPOSE:To correct the spectral characteristics even in case when wavelength of a light source has been varied by a temperature, by constituting so that one of a diffraction grating, an optical fiber or an optical detector train has a function for converting a variation of a temperature to a variation of a position or an angle. CONSTITUTION:An incident side fiber 1 is fixed to a body 5 in a state that it has been optically arranged in advance, together with an optical system consisting of a lens 3, and a diffraction grating 4. As for an output side fiber 2, its two sides are constituted of a bimetal 6 in a state that it has been arranged with the optical system, and it is fixed onto the remaining one side of a parallelogram whose other one side is the body 5. In this state, when a temperature variation occurs, two sides of the parallelogram constituted of the bimetal 6 are bent, a position of the output side fiber 2 is moved in parallel, and the spectral characteristics of a branching filter are compensated. Instead of the bimetal, it is also possible to give a turning moment to the diffraction grating by a temperature variation.

Canceling Surface Acoustic Wave Reflections from Metallic Strips on GaAs Using a Bimetal Geometry

Abstract: Ahstmcr-The magnitude of surface wave reflections from metallic electrodes may be reduced by employing a bimetal geometry. Material properties’of the substrate and metals are used to determine the required electrode composition. Various reflector may devices were fabricated on semi-insulating GaAs substrates and the measured reflection coefficients are presented. This bimetal technique is expected to be useful for eliminating spurious signals due to reflections in SAW signal processing devices.

Temperature sensitive transducer with a resonant bimetal disk

Abstract: A temperature sensing transducer has a mechanically vibrating member whose rigidity varies with temperature, changing the resonant frequency. An output signal is generated having a frequency controlled by the vibrating member. The rigidity is caused to vary with temperature by making the vibrating member from a material whose modulus of elasticity is sensitive to temperature changes in the desired measurement range. Also by making the vibrating member of a bimetal shaped as a frusto-conical disk, the rigidity of the disk changes with temperature due to internal strains.

Method of making copper-clad bimetal electrodes for spark plugs

Abstract: A method of making a bimetal electrode for spark plugs on a single progressive header starts with a cylindrical bimetal blank having a diameter substantially equal to that of the finished electrode, with a core of high temperature-resistant metal and an outer layer of highly thermally conductive material, with the outer layer comprising substantially one-third of the material of the blank. In progressive operations, the blank is coned and then headed to a diameter so that the core at the headed portion has a diameter greater than that of the blank. A shearing operation then shears the outer portion of the headed portion and the thermally conductive material away to leave an end for the firing tip having a diameter equal to that of the rest of the blank but consisting essentially of the temperature-resistant core material.

Manual reset type bimetal thermostat

Abstract: Disclosed is a manual reset type bimetal thermostat where a reversible plate is affixed to a disc type bimetal which can reverse in response to temperature change, characterized in that at least either of the reversible plate and the bimetal is provided with an air passage hole.

Forcibly cooling heat sink

Abstract: PURPOSE:To obtain a heat sink which has preferable heat dissipating characteristic by dividing part of metal cooling fins implanted in parallel with each other in a bimetal structure. CONSTITUTION:A heat sink 5 is integrally mounted on the back surface of a substrate 2 which carries a heat generating body, and fins 3 and a bimetal structure 6 are provided in parallel with each other. When the quantity of heat is increased and the heat sink 5 becomes high temperature, a bimetal structure 6 is bent, causing the flow of the fluid to be disordered. Accordingly, the heat dissipating characteristic of the heat sink is enhanced. The bent is increased as the temperature rises, thereby increasing the effect, followed by operating to maintain the temperature of the heat generating body constant.

Thermocouple bimetal having a high application limit, and method of producing the same

Abstract: A thermocouple bimetal of the type made from a metallic component of high thermal expansion which is bonded to a component of low thermal expansion and in which said component of low thermal expansion consists of a thermally age-hardenable iron-nickel-titanium alloy with 26 to 55% nickel, 1-5% free titanium, 0-16% cobalt, remainder iron including impurities conditioned by the melt, and said component of high thermal expansion consists of a thermally age-hardenable iron-nickel-manganese-titanium alloy with 14-26% nickel, 3-10% manganese, 1-5% free titanium, remainder iron including impurities conditioned by the melt. An advantageous method of producing such a bimetal is also described.

High pressure discharge lamp with thermal switch

Abstract: An electric discharge lamp (5) has an arc tube within an outer gas filled glass envelope (7), and a thermal switching means is located within the outer envelope. The thermal switching means (47) has a bimetal strip (49) and a spring-like member (51) each affixed to at least one of the electrical conductors, and upon application of heat the bimetal strip (49) and spring-like member (51) are flexed to short-circuit the electrical conductors and remove any DC potential between the main electrode (21) and the starting electrode (25) minimizing electrolysis.

Manufacture of bimetal

Abstract: PURPOSE:To suppress oxidation of a metal at the time of hot press-sticking, and to elevate a manufacturing yield, by welding 2 sheets of metals one of which is ''Invar '', by an electronic beam, and subsequently, executing hot rolling by heating at a specified temperature CONSTITUTION:As a base material, to a low expansion side metal, an invar, that is to say, the first metal 1 consisting of an iron alloy containing 35-37% nickel is clad, and to a high expansion side metal, the second metal 2 whose coefficient of thermal expansion is larger than Invar is clad The junction boundary part of both sides in the longitudinal direction of both the clad metals 1, 2 is welded by performing electronic beam welding Subsequently, the welded metals 1, 2 are heated at a temperature of 900-1,000 degC, are made to pass through between rolling rollers, and hot rolling is executed By this hot rolling, the metals 1, 2 are rolled together since the junction boundary part is welded in advance, and at the same time, as for the metals 1, 2, each junction surface is press-stuck to each other Subsequently, the oxide film is removed by sandblast, and they are finished to prescribed dimensions by cold rolling

Bonding for semiconductor element

Abstract: PURPOSE:To positively execute bonding regardless of the boiling of flux or a variation in the height of bumps by a method wherein one end of a bimetal does not press a semiconductor element at room temperature and suitable pressure is applied at a predetermined temperature. CONSTITUTION:When a semiconductor element 3 and a base 5 loading a substrate 1 is passed through a furnace, the temperature at the whole part increases and when the temperature on bumps 4 reaches melting point, the bumps 4 are melted. At that time, a bimetal 6 starts to warp downwards, but space is left between the semiconductor element 3 and a head 7. Then, the bumps 4 are melted by surface tension and the semiconductor element 3 moves to a correct position. The head 7 contacts with the semiconductor element 3 under this heating condition and the bimetal 6 warps. Thus, the head 7 presses the semiconductor element 3 to ensure bonding. When temperature starts to decrease, no warp continues to separate the head 7. At that time, the bumps 4 are still under melting condition and the space between the substrate 1 and the semiconductor element 3 recovers by surface tension. The whole part is cooled under this condition and bonding is completed.

Temperature compensation type thickness slip piezoelectric oscillator

Abstract: PURPOSE:To reduce the rate of change of frequency over a broad temperature range with a simple constitution, by holding a piezoelectric element with a holder applying an external force to the piezoelectric element due to temperature change. CONSTITUTION:A crystal piece 4 having drive electrodes 5, 6 on both major planes is fixed to holders 7, 8 with a conductive adhesives at leads of the electrodes 5, 6. The holders 7, 8 consist of a bimetal overlapping two kinds of metals with different thermal expansion rate and are fixed to terminal pins 9, 10 of air-tight terminals. The holders 7, 8 of the bimetal are bent internally to compensate the temperature characteristics in the rate of change of frequency by applying external forces F1, F2 to the crystal piece 4 axially.

Air direction changing device in air conditioning device

Abstract: PURPOSE:To make the air conditioning device compact, by providing a bimetal air direction changing vane at an outlet port of heat exchanged air, and bowing out the warm air downward and the cool air upward CONSTITUTION:The air direction changing vane 8 is formed to a plate shape by sticking two sheets of metal plates 8a and 8b having different heat expansion coefficients Both ends thereof are fixed to the both side walls facing each other of the outlet port 3 through a shaft or the like The expansion coefficient of the metal plate 8a is made larger than that of the metal plate 8b so that the vane is curved with the longitudinal direction as an axis At the time of cooling operation, the air cooled by a heat exchanger 5 is blown out of the outlet port 3 Since the vane 9 is cooled, the flat plate state or slightly curved state in the upward direction is kept, and the cool air is blown in the horizontal direction At the time of warming, the vane 8 is gradually curved downward with the increase of the air temperature, and the blowing direction is gradually changed to the downward direction

Production of bimetal

Abstract: PURPOSE:To produce bimetal without degradation in a curving constant and mechanical properties by rolling an alloy on a high expansion side and an alloy on a low expansion side at the specific temp higher than the martensite transformation temp of the alloy on the high expansion side CONSTITUTION:The temp for rolling is set at the martensite transformation temp of an alloy on a high expansion side that causes martensite transformation by cold rolling +30 degC, more preferably +60 degC, whereby the martensite transformation is prevented and the degradation in the curving constant occuring in the decrease in the coefft of thermal expansion is prevented in the stage of producing bimetal by rolling said alloy on the high expansion side and an alloy on a low expansion side with or without intervention of an alloy of an intermediate layer The rolling temp is kept at <=500 degC to prevent the degradation in mechanical properties Alloy steel contg about 15-30wt% Ni and about 1-15% Cr is used as the above-mentioned alloy on the high expansion side and an invar alloy or the like is used for the alloy on the low expansion side

Fluorescent lamp circuit breaker with low contact resistance

Abstract: A rapid-start fluorescent lamp includes a circuit breaker therein having a sealed glass bottle, a thermally sensitive bimetal switch within the glass bottle, a pair of electrical conductors sealed into and passing through the sealed bottle with one electrical conductor attached to the bimetal and the other electrical conductor contacting the bimetal with each of the pair of electrical conductors formed of Dumet wire plated with an electrically conductive metal whereby formation of insulative oxides on the electrical conductors is inhibited.

High-pressure metallic vapor discharge lamp

Abstract: PURPOSE:To prevent malfunction of a pulse generating element and to shorten the time for restart by permitting a bimetal switch to perform its deactuating action quickly after the light emitting tube has lightened up and also to perform its restitution to ON promptly after the tube is put off. CONSTITUTION:When the light emitting tube 2 lights up at the time of starting, a bimetal piece 21 lies facing the heat emission H in the radial direction with a certain angle as illustrated in Fig. A, so that the heat from the light emitting tube 2 is easily received to initiate bending immediately. Accordingly, the bimetal switch 5 is deactuated quickly after the start. When the light emitting tube 2 lights up, on the other hand, the bimetal piece 21 is in parallel approx. with the radiating heat line H as illustrated in Fig. B. This attitude provides easy reception of the heat from the tube 2, whereby turning-off of the light emitting tube 2 will allow quick restitution of the bimetal piece 21, so that return to ON of the switch 5 can be made extremely fast.

Determining the degree of influence of iron coatings on the endurance of steel 45

Abstract: 1. The application of electrolytic iron coatings leads to a reduction in the finite fatigue limit of steel 45 by 20–30%, and the lower the probability of failure, the greater the reduction. 2. The test base has a significant influence on the coefficient of reduction of the finite fatigue limit and on the statistical characteristics of the spread in fatigue of steel 45 with and without a coating. With an increase in the base from 106 to 107 cycles the coefficient of reduction in the fatigue limit decreases by 10–12%. 3. The endurance of samples of steel 45 with and without a coating is described with the help of the parameters SL of the Johnson distribution. The determinations obtained of the parameters SL for various test bases makes it possible to predict the finite fatigue limits of the steel-coating bimetal and of the steel 45 with any probabilities of failure. 4. The decrease in the finite fatigue limits of steel 45 with a coating and the increase in the characteristics of spread of fatigue are related to peculiarities in the mechanism of deformation and failure of the steel-coating bimetal.

Bimetal type temperature-sensing valve

Abstract: PURPOSE:To prevent a valve body from sticking to a valve seat by constructing the valve body of an elastic member and a spring to push the valve body and providing a bimetal to push the valve body to a valve seat against the spring and a correcting bimetal to be transformed reversely. CONSTITUTION:A body 12 is provided with a pair of ports 12a and 12b, and a cylinder member 16 is fitted with a valve seat 15 to the lower end of the port 12b. A valve body 17 to open and close the valve seat 15 is pushed by a spring 18 to be separated, and held by a rod 14 from below. In a temperature-sensing chamber 14b under the rod, a bimetal 24, a leaf spring 23, and a correcting bimetal 31 to be thermally transformed in the opposite direction to the bimetal 24, are arranged. When the bimetal 24 is transformed upward by the rise of temperature, the correction bimetal 31 is transformed downward to offset the rise of a rod 22.

Closed type catalyst plug

Abstract: PURPOSE:To obtain the high efficiency of water recovery during a normal use and to secure the safety when a large quantity of acid or hydrogen gas flows in by fitting a sealing member to a bimetal to block the discharge hole of a closed catalyst plug used for a battery CONSTITUTION:A catalyst container 4 enclosing a catalyst pellet 5 is stored in an external housing 1 and a discharge hole 1-2 is provided on its upper plate 1-1 to form a closed catalyst plug used for a battery, then a sealing member 1-2 such as heat-resistant rubber or the like is fixed to a bimetal 2 to block the discharge hole 1-2 with the sealing member 1-2 Accordingly, the discharge hole 1-2 is closed under a condition that a small quantity of acid or hydrogen is generated, and when a large quantity of acid or hydrogen gas is generated, the discharge hole 1-2 can be opened by allowing the bimetal 2 to operate by means of its heat, thus the high efficiency of water retrieval is normally attained and the safety can be secured when a large quantity of gas flows in

Bimetal-actuated temperature responsive valve assembly

Abstract: The bimetal-actuated temperature responsive valve assembly includes a body having inlet and outlet parts, a valve member for controlling communication between the inlet and outlet parts, a movable rod engageable with said valve member, a first bimetal disc engageable with the rod, a spring disposed between the body and the first disc for biasing the first disc, the rod and the valve member toward a closed position and a second bimetal disc operatively associated with the first bimetal disc for moving the first disc against the bias of the spring.

Device for preventing abnormal temperature rise of fixing device in electrophotographic copying machine

Abstract: PURPOSE:To efficiently absorb energy radiated from the surface of a heating roll, by blackening the part of a thermostat to be heated. CONSTITUTION:A thermostat 10 has a housing 8 and a disc holder 9 under the housing 8. A movable contact point 6 is turned on and off by the action of the movable pin 5 of the holder 9. A bimetal 4 is installed in the inside of a cap 3 made of a metal having high heat conductivity. When the temp. of the bimetal 4 is elevated to a certain set value, it's shape becomes concave or convex, and the point 6 is opened through the pin 5. The part D of the thermostat 10 to be heated is blackened by inorganic treatment, such as zinc plating, coating with black chromate, black oxidized oil shale, heat resistant black paint, etc., in order to enhance absorption efficiency of radiated energy by the part D.