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    • 2. 发明专利
    • DEVICE FOR STEPWISE DISPLACEMENT OF AN OBJECT
    • GB1510550A
    • 1978-05-10
    • GB4846575
    • 1975-11-25
    • LKB PRODUKTER AB
    • B23Q5/28B23Q5/22B23Q5/50G01N1/06G12B5/00H02K7/065F16H27/00H02N7/00H02N11/00
    • 1510550 Microtomes LKB-PRODUKTER AB 25 Nov 1975 [26 Nov 1974] 48465/75 Heading G2J [Also in Divisions F1 F2 and H2] A linear actuator in a microtome for effecting stepwise displacements of a driven object includes an elongate member I which can be caused reversibly to expand and contract in length by the action of an activating device 5, and two releasable clamps 2, 3, in each of which the elongate member 1 may be held stationary in a V-shaped groove 11, Fig. 2. Each clamp may be comprised of a contact screw 13 carried by a spring arm 12 which may be lifted by means of a lever 15 on a fulcrum 16, impelled by an electromagnet having a coil 18 and core 17. A mechanical link 6 may convey the displacements to a driven object (not shown). A sequencing switch 7 is provided, for connecting a power supply 8 to the clamps 2, 3, and the activating device 5, in such a manner that unidirectional stepwise displacements are produced. For example, with clamp 3 released and clamp 2 secured, the activating device 5 may produce an expansion of member 1, causing link 6 to be driven in a leftward direction as shown in Fig. 1, and then clamp 3 is secured, clamp 2 is released, and the activating device 5 then causes contraction, until clamp 2 again becomes secured, clamp 3 is released, and the foregoing cycle is repeated. The switch may alternatively be set to provide displacements in an opposite direction. In one embodiment the member 1, or a portion of that member, is composed of a magnetostrictive material. In another embodiment, a material susceptible to a Piezoelectric effect is employed. In a third embodiment, the member may include a material which expands or contracts when heated, and the activating device 5 is a heater.
    • 7. 发明专利
    • HEAT MOTOR AND CONTROL
    • CA1055904A
    • 1979-06-05
    • CA302438
    • 1978-05-02
    • NEW ENGLAND UNION CO INC
    • DRAXLER HELMUT J
    • F16K31/04H02N7/00
    • The specification describes a heat motor and control therefor for use in a valve construction, comprising a cylinder in which a heat responsive material is located, a base joined to said cylinder and projecting outwardly therefrom, a piston mounted for longitudinal movement in said base and in response to a predetermined increase in temperature of said heat responsive material, a flexible printed circuit heating element surrounding said cylinder and being operable to heat said material to an effective operating temperature, an insulating sleeve surrounding said heating element for insulating the heating element during the heating cycle thereof, and a thermal switch mounted directly on said cylinder and electrically connectable in circuit with said heating element, said switch being normally closed to complete the electrical circuit to said heating element, and including a temperature responsive element that is movable in response to a predetermined temperature in said cylinder to open the circuit to said heating element, wherein the heating element is deenergized.