专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

11. 发明专利

GB700911A Improvements relating to signalling transformer apparatus for use in dangerous atmospheres 未知
公开(公告)号：GB700911A
公开(公告)日：1953-12-16
申请号：GB1714650
申请日：1950-07-10
申请人： JOHN DAVIS & SON DERBY LTD , WILFRID HENRY DAVIS
IPC分类号： H01F27/40
摘要： 700,911. Transformer arrangements. DAVIS & SON DERBY, Ltd., J.. and DAVIS, W. H. Oct. 10, 1951 [July 10, 1950], No. 17146/50. Classes 38 (2) and 38 (4) A signalling transformer apparatus of the intrinsically safe type (as defined in British Standards Specification 1259:1945) has a small wattage indicator lamp 15 connected directly across the secondary winding of the transformer and which is visible through a window in the flame proof casing 13 of the apparatus, the lamp being so arranged that the current which it consumes does not reduce the intrinsically safe output available from the transformer for signalling purposes. The intrinsically safe output is taken from terminals 12, 12a, the secondary winding in series with a current limiting resistor 17 being connected between these terminals. A terminal board 20 may be arranged to carry the indicator lamp ; the resistor 17 may also be wound thereon. Thus a failure is indicated without unnecessary opening of the flame proof casing.

12. 发明专利

GB603372A Improvements in and relating to exploder devices for shot-firing 未知
公开(公告)号：GB603372A
公开(公告)日：1948-06-15
申请号：GB2746745
申请日：1945-10-19
申请人： JOHN DAVIS AND SON DERBY LTD , CLIFFORD DAWSON
IPC分类号： F42D1/045
摘要： 603,372. Machines with permanent magnets. DAVIS & SON, DERBY, Ltd., J. and DAWSON, C. Oct. 19, 1945, No. 27467. [Class 35] A generator for use as an exploder has a rotary magnet disposed in an approximately cylindrical recess formed in the stator. In the form shown, a cylindrical magnet 15 is disposed between arcuate stator polepieces 14 carrying a winding 13 connected to terminals in an end cover through a switch closed when the driving mechanism is operated. Specification 551,957 is referred to.

13. 发明专利

DE527572C 未知
公开(公告)号：DE527572C
公开(公告)日：1931-06-19
申请号：DED0059188
申请日：1929-09-06
申请人： VERNON JOHN DAVIS
IPC分类号： B22C5/06

14. 发明专利

GB338628A Improvements in or relating to riddles 未知
公开(公告)号：GB338628A
公开(公告)日：1930-11-27
申请号：GB2666329
申请日：1929-09-02
申请人： VERNON JOHN DAVIS
IPC分类号： B22C5/06
摘要： 338,628. Davis, V. J. Sept. 2, 1929. Sieves with compound motion.-A riddle, for sifting sand for moulding operations and for other purposes is mounted by a. set-screw 2, in a frame 1, Fig. 2, which is supported by a bar extending from one end in a hanger 13 carried and actuated by eccentrics 11 on the shaft 10 of an electric motor 9. The motor is bolted to a bracket 4 hinged to a support 3, and is relieved of the weight of the frame and hanger by a spring 31 and by two springs 24 connected to the bracket 4 and a cross-bar 26 connected to rearwardly extending arms 25 of the hanger. The sieve frame is inverted to discharge accumulations of oversize materials and is held in its normal position by the engagement of a projection on the collar 19 of the supporting rod with a corresponding notch in the end of the bush 34 of the hanger, under the action of a compression spring 36, Fig. 3, inserted between a flange 37 on the end of the supporting rod 18, and an abutment on the bush of the hanger.

15. 发明专利

GB332201A Improvements in or relating to variable resistance devices 未知
公开(公告)号：GB332201A
公开(公告)日：1930-07-15
申请号：GB1159929
申请日：1929-04-15
申请人： WILFRED JOHN DAVIS
IPC分类号： H01C10/48

16. 发明专利

GB327033A Improvements in miners' electric battery lamps 未知
公开(公告)号：GB327033A
公开(公告)日：1930-03-27
申请号：GB1237829
申请日：1929-04-22
申请人： JOHN DAVIS AND SON DERBY LTD , WILLIAM GRAFTON
IPC分类号： F21L4/00 , F21V25/02
摘要： 327,033. Davis & Son, Derby, Ltd., J., and Grafton, W. April 22, 1929. Battery lamps.-A device for short-circuiting the filament of the bulb c of a miner's lamp and for blowing a fuse i connected with the circuit thereof when the protecting glass casing b is broken comprises a push-rod a which is fitted at one end into a recess b of the casing and depresses a spring-contact strip d. The central contact h of the bulb is connected through a metal piece o to a metal strip g, which is secured between fibre pieces k and is conected through the fuse i to a battery terminal. The screwed thread of the bulb is connected to the other battery terminal through the holder e.

17. 发明专利

GB309015A Improvements in or relating to electric condensers 未知
公开(公告)号：GB309015A
公开(公告)日：1929-04-03
申请号：GB17128
申请日：1928-01-03
申请人： WILFRED JOHN DAVIS
IPC分类号： H01G4/38
摘要： 309,015. Davis, W. J. Jan. 3, 1928. Condensers. - To obviate the use of external connectors and soldered joints for sections connected in series, the adjacent outside foils or electrodes 4a of neighbouring sections are m a d e of thicker material and arranged in direct contact, the sections being clamped together under pressure. To prevent flash-over, the end dielectric spacers 5a are extended into the path between adjacent turnstiles 6, 7.

18. 发明专利

GB276741A Improvements in or relating to adjustment devices particularly suitable for use with variable condensers, variometers and the like instruments 未知
公开(公告)号：GB276741A
公开(公告)日：1927-09-02
申请号：GB1398026
申请日：1926-06-02
申请人： WILFRED JOHN DAVIS
IPC分类号： H03J1/14
摘要： 276,741. Davis, W. J. June 2, 1926. Wireless tuning- apparatus, adjustment and indicating devices for. - A coarse and fine adjustment mechanism comprises epicyclic friction or toothed gearing having the intermediate wheels carried in a rotatable cage rigidly fixed to the operating- spindle, one of the gears being prevented from rotating during the fine adjustment, the arrangement being such that during the coarse adjustment there is no relative rotation between the gear wheels which rotate as a whole. In one construction, Fig. 1 (Provisional Specification), the intermediate wheels H, J are carried between plates D, E rigidly secured to the spindle A by a grub screw G. The fine adjustment spindle M is integral with a pinion L which is pressed into contact with the wheels H by springs K, the wheels J being simultaneously pressed into contact with the rim of a dished washer C. The washer C is loosely mounted on the spindle A and has a felt or other liner in its under side which frictionally engages the panel B. In modifications, the springs K engage with the pinion L only, pressure being transmitted through the gear wheels to the panel. The grub screw G is also arranged to project to the exterior of the coarse adjustment knob.

19. 发明专利

GB210588A Valve lifter for internal combustion engines 未知
公开(公告)号：GB210588A
公开(公告)日：1924-02-07
申请号：GB3433922
申请日：1922-12-16
申请人： HUGH JOHN DAVIS
IPC分类号： B25B27/26
摘要： 210,588. Davis, H. J. Dec. 16, 1922. Prizing-tools.-A tool for compressing the valve springs of internal combustion engines comprises a forked lever 1 pivoted on a pedestal adapted to be on the engine or other suitable part, and a catch 8 pivoted on the lever adapted to engage, the exhaust manifold or like part independent of the lifter to hold the valve spring in its compressed condition. The pedestal consists of a foot 5 having an eye-bolt 4 screwed therein, notches 7 on the foot serving to engage a flange on the engine. The eye-bolt 4 is pivoted to a lug 1 on the lever which may have a number of holes so that the position of the fulcrum can be adjusted. The catch 8, which moves in a slot in the lever and may be adjustable in length, is pivoted to a lug 9. A number of pivot holes may also be provided in the lug 9.

20. 发明专利

GB189233A Improvements in calling devices adapted to be operated by wireless signals 未知
公开(公告)号：GB189233A
公开(公告)日：1922-11-27
申请号：GB2272421
申请日：1921-08-26
申请人： WILFRED JOHN DAVIS
IPC分类号： H04L15/26
摘要： 189,233. Davis, W. J. Aug. 26, 1921. Electric selectors.-An alarm is actuated only on the receipt of signal impulses consisting of a regular series of dashes of definite length and spacing, for example three dashes each of four seconds duration, with an interval of one second between consecutive dashes. Provision is made for a limited error in timing either in the dash or in the interval. Signals outside the predetermined sequence and the permitted error margin, reset the apparatus without ringing the alarm. Alternatively the apparatus can be arranged to respond to intervals of predetermined length. The first signal opens a contact B and de-energizes an electromagnet C, the armature of which is so controlled by a spring c and dash pot D that it closes a spring contact E after three seconds, and a fixed contact F after five seconds of persistent de-energization. The contact E energizes a second delay-action relay H, and also an electromagnet J which causes a pawl K to turn a ratchet-wheel k through one tooth. Three such impulses bring a contact o, inset on a disc O at the axle L under an arm Q, thereby closing the circuit of an alarm bell R, which is kept ringing by the closure of a holding-contact v. If the signal impulse is prolonged beyond five seconds, the contact F is closed to energize a magnet u through a circuit which includes a contact T. The magnet u withdraws the pawl K and detent N from contact with the wheels k, n, Fig. 2, and the shaft L is re-set by a coiled spring l. The relay H measures the duration of the space between consecutive dashes. It is de-energized directly the contact E is broken at the end of any given signal. This contact E is not re-made until three seconds after the impact of the succeeding impulse. If the total interval during which the relay H is left de-energized exceeds five seconds, the contact I is made, and the magnet n is actuated to re-set the wheels and shaft L. Contacts W, X are inserted to prevent jamming signals from actuating the alarm bell by giving rise to rapid irregular vibrations of the armature of the first relay C.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式