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    • 7. 发明专利
    • Improved jack device
    • GB728146A
    • 1955-04-13
    • GB1511952
    • 1952-06-16
    • GEORGE MOXON MINING LTDJAMES EDGAR MOXON
    • B66F1/00B66F1/06E21D15/20E21D15/54E21F13/08
    • 728,146. Lever load-handling machines. MOXON (MINING), Ltd., G., and MOXON, J. E. March 30, 1953 [June 16, 1952], No. 15119/52. Class 78 (3). [Also in Group X] In a rack-and-ratchet jack mounted on a strut which may be wedged between a pair of opposed surfaces, e.g. a mine roof and floor, to form a reaction member, the jack is mounted on the strut for rotary movement about the longitudinal axis of the rack bar. The jack comprises a rack 23 slidable through a housing 21 by a lever 28 pivoted at 27 to a link 26 which is pivoted at 25 to the housing; a pair of spring- pressed pawls (not shown) being provided in the casing to sustain the load whilst the pin 29 is disengaged from the rack teeth. A member 34 is provided to render the pawls inoperative. A cylindrical portion 19 on the housing 21 is rotatably mounted between a pair of half bearing members 16, 17 on the floor engaging foot 11 and flanges 22 on the portion 19 prevent it moving axially. The load-engaging head 48 is mounted on the rack for universal movement about axes 50, 52. Pivoted to the housing at 14 is a tubular member 13 provided with pairs of holes 39 co-operating with a pin 40 which adjustably supports a rod 12 provided with a roof-engaging head 42, sliding movement of the rod in the tube being limited by a pin 46 engaging a slot (not shown) in the rod. The strut 12, 13 may be wedged between a pair of horizontal surfaces instead of the roof and floor.
    • 9. 发明专利
    • Improvements relating to arrangements for operating electric discharge lamps
    • GB533016A
    • 1941-02-05
    • GB1944339
    • 1939-07-04
    • SIEMENS ELECTRIC LAMPS & SUPPLJOHN NORMAN ALDINGTONJAMES EDGAR ASKEW
    • H05B41/10
    • 533,016. Discharge lamps. SIEMENS ELECTRIC LAMPS & SUPPLIES, Ltd., ALDINGTON, J. N., and ASKEW, J. E. July 4, 1939, Nos. 19443/39 and 412/40. [Class 39 (i)] [Also in Group XXXVII] The method of starting a discharge lamp consisting in including in series with it a choke which also acts as an electromagnet to operate a switch which breaks a heating-circuit for the electrodes including the choke is applied to lamps in which the electrodes are connected in series so as to be both heated for starting by the current, this necessitates enclosing the switch in an envelope which does not contain air, it may be exhausted or contain oil or a'neutral gas. The invention is especially applicable to lamps of 1 metre and over in length. The switch may comprise a loose bar forming the armature of the choke magnet and bridging two mercury contacts or the armature may be carried on a leaf spring which carries or operates the contact. Fig. 5 shows an arrangement of the latter sort with provision for slight delay in the separation of the contacts. The armature 17 is mounted on a leaf spring 40 carrying a hook 19 arranged to engage a wire 22 after the armature has moved a certain distance. The wire 22 is mounted on a leaf spring 21 and makes contact with a wire 25.