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1. 发明专利

GB643885A An improved mobile tower for supporting cameras, optical projectors or other apparatus used in the cinematographic film making industry 未知
公开(公告)号：GB643885A
公开(公告)日：1950-09-27
申请号：GB2801847
申请日：1947-10-20
申请人： PRODUCTION FACILITIES FILMS LT , DAVID WILLINGHAM RAWNSLEY , EDWARD RAMSAY GREEN
IPC分类号： G03B17/56
摘要： 643,885. Load-handling machines. PRODUCTION FACILITIES (FILMS), Ltd., RAWNSLEY, D. W., and GREEN, E. R. Oct. 20, 1947, No. 28018. [Class 78 (iii)] [Also in Group XX] A mobile tower for supporting kinematographic cameras or other optical apparatus comprises a platform 4 raised and lowered between uprights 3 extending from the base 1 of the tower by power means, the base comprising wheels 6 adapted either to bear upon the ground for transport or to be raised from the ground so that the tower is supported on fixed members. The fixed members preferably comprise jack-actuated feet 5, wheels 6 being freely rotatable on axes fixed vertically but capable of swivelling. The platform is supported between vertical guides 22 in the uprights 3 by means of four slippers 15 secured to two uprights 20, Fig. 4, extending upwards from the platform and forming part of a framework which also includes a transverse beam 11. Each slipper 15 consists of a U- shaped channel member, Fig. 4, to one side of which is fixed a plate 31, the other side being provided with a similar plate 23 loosely attached to the slipper by dowels and by a bolt 25. Plate 23 is kept in light frictional contact with guide 22 by means of a spring 26 adjustable by nut 28. A taper jib 16 is supported in brackets 32 on each slipper for sliding vertically, so that movement of a lever 17 operating a short double arm crank 18 at each side of the platform which is connected through links 19 to the jibs at that side, moves them in a direction so as to press on the plates 23 of each slipper, causing binding on the guide 22 and consequent locking of the platform. Cables 7 attached to the platform pass through apertures 12, Fig. 4, in the slippers 15 and over pulleys 8 to a winch or hydraulic ram in the base, counterweights 13 sliding on guides 14 being included in the vertical stretches of the cable in the uprights 3. The wheels 6 at two corners may be coupled together for steering, while the other two wheels or wheel pairs are free to trail. Alternatively, the wheels may be flanged and on fixed axes, one at each corner of the base, for running on a rail track and a further set of flanged wheels on axes at right angles to the first set may be arranged to be lowered by hydraulic jacks to engage cross-over rails leading to a parallel track. In all forms the jackactuated feet 5 may be replaced by fixed feet and the wheels may be raised and lowered by separate jacks or a single jack coupled to all the wheels.

2. 发明专利

GB650461A An improved mobile screen holder adapted more especially for use in the picture filmmaking industry 未知
公开(公告)号：GB650461A
公开(公告)日：1951-02-28
申请号：GB2802147
申请日：1947-10-20
申请人： PRODUCTION FACILITIES FILMS LT , DAVID WILLINGHAM RAWNSLEY , EDWARD RAMSAY GREEN
IPC分类号： G03B21/58
摘要： 650,461. Load-handling machines; hydraulic jacks. PRODUCTION FACILITIES (FILMS), Ltd., RAWNSLEY, D. W., and GREEN, E. R. Oct. 20, 1947, No. 28021. [Class 78 (iii)] [Also in Group XX] A screen holder intended more especially for use in the picture film making industry, comprises a low wheeled truck 3 bearing a pair of widely spaced uprights 8 to each of which is pivotally connected a luffing arm 15 which arms are connected by a cross rail carrying thereon a platform 18 from beneath which is suspended a projection screen 22. The arms 15 which are counterbalanced by the mechanism disclosed in Specification 650,470, are luffed by means of a motor-driven reduction gear driving a worm 25 which rotates a gear engaging a toothed sector 26 secured to the arms. The platform 18 is maintained horizontal for all positions of the arms 15 by means of chains 17 engaging sprockets 171, 161 secured to the uprights and platform 18 respectively. A telescopic stay 23 is used to steady the screen at any desired angle. Hydraulic jacks.-The wheel units 4 are simultaneously retractable by means of jacks 5, Fig. 7, the piston rods 9 of which are axially rotatable with the wheel units and have splined thereto sprockets 14 which are axially slidable thereon to allow the wheels to retract. The sprockets on adjacent wheel units are connected by endless chains 13 which ensure equal rotational steering movement of each wheel unit. In a modification (not shown) this chain and sprocket mechanism, together with the mechanism for maintaining platform 18 horizontal, may be replaced by linkage mechanisms.

3. 发明专利

GB650470A Improved means for counterbalancing a pivoted arm or member 未知
公开(公告)号：GB650470A
公开(公告)日：1951-02-28
申请号：GB426748
申请日：1948-02-13
申请人： PRODUCTION FACILITIES FILMS LT , DAVID WILLINGHAM RAWNSLEY , EDWARD RAMSEY GREEN , JOHN GEORGE GILL
IPC分类号： B66C23/72
摘要： 650,470. Balancing devices ; jib cranes; load - handling apparatus. PRODUCTION FACILITIES (FILMS), Ltd., RAWNSLEY, D. W., GREEN, E. R., and GILL, J. G. Feb. 13, 1948, No. 4267. [Classes 78 (ii), 78 (iii) and 78 (iv)] An unbalanced arm 1 (Fig. 2), which may be the jib of a crane is secured to a shaft 2 and is balanced by a spring 3 connected at one end by a cable 10 to a sector 11 on the arm 1 and at the other end to a pin 4 on a crank 5 secured to a shaft 6 carrying a sprocket 7 connected by a chain 8 to a sprocket 9 on the shaft 2. Thus the chain exerts balancing forces directly on the sector 11 and indirectly through the chain 8 on the shaft 2. As shown, the crank 5 is horizontal when the arm 1 is vertical. The sprockets 7, 9 may be of different sizes and the sector 11 may be specially shaped. The spring 3 may comprise a series of compounded springs which become effective at various points during the displacement of the arm 1 and the tension spring 3 may be replaced by a compression spring or springs acting through a suitable harness upon pull rods. Fig. 6 shows the application of the invention to means for supporting a kinematograph screen 13 as in Specification 650,461. The arm 1 supported on a shaft 2 carries a sector (not shown) behind the rack-wheel 17 to which sector is secured a cable 10 connected to a spring 3 secured at 4 to a crank 5 on a shaft 6 connected by a chain 8 passing round a guide sprocket 30 and round sprockets 7, 9 on the shaft 2. The remaining description of Fig. 6 is included in Specification 650,461, which is referred to.

4. 发明专利

GB641281A Improvements in and relating to frames for sustaining optical projection screens 未知
公开(公告)号：GB641281A
公开(公告)日：1950-08-09
申请号：GB100248
申请日：1948-01-13
申请人： PRODUCTION FACILITIES FILMS LT , DAVID WILLINGHAM RAWNSLEY , EDWARD RAMSAY GREEN , JOHN GEORGE GILL
IPC分类号： G03B21/58

5. 发明专利

GB645497A Improvements in and relating to the steering of trucks and like wheeled vehicles 未知
公开(公告)号：GB645497A
公开(公告)日：1950-11-01
申请号：GB2801947
申请日：1947-10-20
申请人： PRODUCTION FACILITIES FILMS LT , DAVID WILLINGHAM RAWNSLEY , EDWARD RAMSAY GREEN , GEOFFREY NORMAN TICEHURST
IPC分类号： B62D7/02
摘要： 645,497. Vehicle steering. PRODUCTION FACILITIES (FILMS), Ltd., RAWNSLEY, D. W., GREEN, E. R., and TICEHURST, G. N. Oct. 20, 1947, No. 28019. [Classes 79 (iii) and 79 (v)] [Also in Group XXIX] A truck comprises four steerable ground wheels, each mounted for independent swivelling movements, a power-operated steering unit for each wheel, and steering control mechanism controlling the supply of power to the units whereby the wheels can be swivelled so that either different pairs of wheels can be locked with their axles aligned while the remaining two wheels are coupled together for related steering movement or all the wheels can be locked with their axles disposed radially to a common centre within the truck when it is desired to rotate the truck about this centre. The truck may have pairs of steering wheels forming units disposed at each corner, each pair being capable of swivelling about a vertical axis. The units are controlled from the steering control mechanism by hydraulic means, but according to the provisional specification the control may be mechanical, electrical or hydraulic. The control mechanism controls the units for three methods of steering as shown in Fig. 1, in the first of which the axles of all the wheels are aligned to cause rotation of the truck about a central vertical axis, in the second the two rear wheel units are held immovable and steering is obtained by movement of the front units during forward or rearward movement of the truck and in the third method two side wheel units are held against swivelling and the other units are controlled for steering during lateral movement of the truck. As shown each pair of wheels 2 can swivel about a king pin 4 and may be driven from an electric motor 5 and through a differential gear 3. Integral with each king pin 4 is a pinion 9 operated by racks 8 each connected to a plunger in a single acting twin cylinder hydraulic ram. Secured to one of the racks 8 is a cable 10 leading to the steering control mechanism 11, to which also lead delivery and return pipes for the ram of each steering unit. The hydraulic system comprises a header tank 25, a pump 27 with a delivery pipe 29, a by-pass relief valve 28 and a low pressure return pipe 30. The pump 27 delivers pressure fluid through a control valve 31 and pipes 32 to jacks 6 situated at each corner of the truck, operation of which jacks supporting the truck when static, and a hydraulic control valve 16 in the control mechanism 11 for each of the steering units. The steering control mechanism 11 comprises a steering shaft 12 having secured to it a steering wheel or tiller bar (not shown) and cams 13. A roller 18 on a spring-loaded lever 17 follows each cam 13, the levers 17 controlling the hydraulic valves 16. Another roller 18 on the lever 17 follows a cam 15 rotatably mounted on a shaft 14, the cams 15 being controlled by the cables 10. Secured on the shaft 12 is a sector plate 20 having three cut-away portions corresponding to the above-mentioned three methods of steering. A movable plunger 21, which can be interlocked with the switch controlling the electric motors to prevent any accidental driving of the truck during the change over from one method of steering to another, engages the required portion of the sector plate 20 permitting angular movement of the shaft 12 within that portion. Movement of the shaft 12 which is damped by a hydraulic dashpot 33 causes actuation of the appropriate hydraulic valves 16 (dependent upon the method of steering required) through the respective cams 13 and lever 17, the valves 16 in turn actuating the plungers of the appropriate steering units. This movement cf transmitted from the steering units by the cables 10 to the cams 15 which operates the levers 17 causing a centralising and closing of the associated valves 16. Change over from one steering method to the other is effected by appropriately shaping the cams, eccentric portions of each cam 13 causing the requisite movement of each wheel unit on rotation of the shaft 12 between one cut-away portion of the plate 20 and the next.

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