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    • 85. 发明专利
    • Improvement in thermostatic device and method of and apparatus for making the same
    • GB243511A
    • 1925-12-03
    • GB2677224
    • 1924-11-10
    • JOHN ALBY SPENCER
    • G01K5/32G01K5/68
    • 243,511. Spencer, J. A. Nov. 10, 1924. Thermostats.-In making a bi-metallic thermostatic element, the metal is clamped and heated to a temperature above its working range, the clamping preventing change of shape upon change of temperature. The method is particularly applicable to disc-shaped elements which alter their shape suddenly at a critical temperature. The clamp comprises a cylinder 1 adapted to receive a number of discs 3 separated by spacers 5, the discs being maintained flat by a clamping screw 11. The clamp is then placed in an oven and heated to about 450‹ C. for one hour. When the discs are released, they are concave on the side having the higher expansion coefficient, and operate more uniformly when in use. If the discs have a central aperture, the clamping bolt may pass through them. The discs are then shaped in a press, Fig. 7, between dies 17, 19, the movement of the upper die being limited by washers 28 and a ring 30. The temperature during pressing is preferably 100-150‹ C. above that at which the discs are to be used. After pressing, the discs are heated on a hot plate or oven to 50-100‹ C. above the maximum temperature in use, for 10-30 minutes. Specifications 19011/09 and 178,103 are referred to.
    • 88. 发明专利
    • Improvements in or relating to thermostats
    • GB158931A
    • 1921-02-24
    • GB2463319
    • 1919-10-08
    • HERBERT HAMILTON GRUNDY
    • G01K5/62G01K5/68
    • 158,931. Grundy, H. H. Oct. 8, 1919.. Thermal switches; mercury switches.-Relates to thermostats of the type such as described in Specifications 5311/12 and 110,938, in which an operating member A, Figs. 1 and 2, composed of one or more bi-metallic strips is adapted to actuate a rocking-switch B controlling the heating or cooling means. In order to obtain a better regulation of the temperature at which the thermostat responds, both the rocking-switch and the bi-metallic strip are capable of adjustment independently of each other, the coarser adjustment of the bi-metallic member being obtained by pivoting it at A on a supporting bar H and by operating screws A bearing upon the sides of the member A, and the finer adjustment of the rocking-switch B being obtained by mounting the switch on a carrier F slidable in a slotted curved plate G, Figs. 3 and 4, and operated by means of a rotatable threaded rod L engaging a nut K on the carrier. In order to allow the switch to move in a curved path while the nut K traverses a straight path, the nut is provided with trunnions K engaging slots F in the carrier. The rocking-switch is pivoted on a spindle C on the carrier, and a stop B is mounted on the carrier to limit the movement of the switch in either direction. The support H for the plate G and rod L is in the form of an annular member supporting a cylindrical casing M having apertures for the passage of the strip A and rod L, the various apertures facilitating circulation of the air around the switch. The strip A is preferably surrounded by a casing carrying a thermometer. In place of a single bi-metallic strip A, two strips A, Fig. 7, connected at their lower ends and normally splayed apart at their upper ends but held together under tension by a connecting piece A may be employed. The two strips A may either be straight or substantially U-shaped or coiled in reverse directions, the metals being so arranged that the free ends tend to move in the same direction under variations of temperature.