GB506792A - Improvements in and relating to extending and raising gear for ladders, telescopic masts, extensible platforms and the like - Google Patents
Improvements in and relating to extending and raising gear for ladders, telescopic masts, extensible platforms and the likeInfo
- Publication number
- GB506792A GB506792A GB32967/37A GB3296737A GB506792A GB 506792 A GB506792 A GB 506792A GB 32967/37 A GB32967/37 A GB 32967/37A GB 3296737 A GB3296737 A GB 3296737A GB 506792 A GB506792 A GB 506792A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pump
- drum
- valve
- clutch
- ladder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000012530 fluid Substances 0.000 abstract 3
- 230000004048 modification Effects 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
- 238000004804 winding Methods 0.000 abstract 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06C—LADDERS
- E06C5/00—Ladders characterised by being mounted on undercarriages or vehicles Securing ladders on vehicles
- E06C5/02—Ladders characterised by being mounted on undercarriages or vehicles Securing ladders on vehicles with rigid longitudinal members
- E06C5/04—Ladders characterised by being mounted on undercarriages or vehicles Securing ladders on vehicles with rigid longitudinal members capable of being elevated or extended ; Fastening means during transport, e.g. mechanical, hydraulic
- E06C5/16—Ladders characterised by being mounted on undercarriages or vehicles Securing ladders on vehicles with rigid longitudinal members capable of being elevated or extended ; Fastening means during transport, e.g. mechanical, hydraulic using mechanical transmission only, with or without fluid or other non-mechanical couplings or clutches
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Structure Of Transmissions (AREA)
- Auxiliary Drives, Propulsion Controls, And Safety Devices (AREA)
Abstract
506,792. Winding and paying - out apparatus. HUMBOLDT - DEUTZMOTOREN AKT.-GES. Nov. 29, 1937, No. 32967. Convention date, Nov. 28, 1936. [Class 78 (v)] [Also in Groups XXI and XXIV] The. winding-drum of a ladder, telescopic mast, or the like is driven through epicyclic gearing controlled by a fluid pump, the speed of rotation of the drum being determined by the setting of a throttling device which controls the resistance of the pump circuit. Overload on the drum is effective to open a fluid actuated clutch, between the epicyclic gear and the prime mover. A motor 1 is connected by a clutch 2, 3, controlled by a pressure cylinder 21 to a worm gear 4, 5 which drives the sun wheel 7 of the epicyclic gear, the second sun wheel 10 of which is connected by a shaft 11 to a gear pump 13. The planet wheels 8, 9 are mounted in the rope drum 12. The pump 13, Fig. 3, includes pressure and suction valves 15, 16 connected by links 14, 34, 35 and adapted to be operated in unison by a rod 36. Pressure fluid for actuating the clutch 2, 3 can be supplied to the cylinder 21 by a pump 20 by way of a pipe 37, valve 17, passage 40 in the valve 15, and pipe 31. The valve 17 has a lever 18 stressed by a spring 19 but held in the position shown by the rod 42 of a piston 45. The latter is exposed to the pressure side of the pump 13 and is biassed to the position shown by a spring 44, the tension of which is controlled by a cam 23 carried by the valve 16. The cam is such that movement of the valve in a direction corresponding to the driving of the drum 12 is effective to increase the tension of the spring 44. To start the apparatus, the link 35 is moved to the position a, Fig. 3. This connects the passage 40 to the pipe 31, so that the clutch 2, 3 is closed and the wheel 7 is driven. The circuit resistance of the pump 13 is low, so that the wheels 8, 9 drive the wheel 10 without rotating the drum 12. As the link 35 is moved progressively towards position d, the valve 15 is progressively closed, the circuit resistance of pump 13 rises, and the drum 12 is driven up to a maximum speed at the position d. If the drum is overloaded, as by the ladder striking an obstruction, the drum is locked, the wheel 10 and pump 13 are then driven at a higher speed, and the pump pressure acts on piston 45 to release lever 18. The valve 17 then connects the pipe 31 to the pump casing, so that the clutch 2, 3 opens. Simultaneously, the valves 15, 16 are returned to starting position through rods 48, 36, so that the ladder can descend under the braking action of the reverselydriven pump 13 and the worm gearing. For lowering the ladder, the link 35 is moved to the positions a<1>-d<1>. In a modification, the clutch 2, 3 and worm gearing 4, 5 are replaced by a combined clutch and brake mechanism controlled by the cylinder 21.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE506792X | 1936-11-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB506792A true GB506792A (en) | 1939-05-30 |
Family
ID=6546645
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB32967/37A Expired GB506792A (en) | 1936-11-28 | 1937-11-29 | Improvements in and relating to extending and raising gear for ladders, telescopic masts, extensible platforms and the like |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB506792A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2964615A1 (en) * | 2010-09-10 | 2012-03-16 | Mecaplast Sa | DEVICE FOR CONTROLLING A RETRACTABLE MARKET FOR ACCESSING A VEHICLE'S CAB |
CN115419361A (en) * | 2022-09-06 | 2022-12-02 | 贵州电网有限责任公司 | Multifunctional ladder with movable supporting point |
-
1937
- 1937-11-29 GB GB32967/37A patent/GB506792A/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2964615A1 (en) * | 2010-09-10 | 2012-03-16 | Mecaplast Sa | DEVICE FOR CONTROLLING A RETRACTABLE MARKET FOR ACCESSING A VEHICLE'S CAB |
EP2428401A3 (en) * | 2010-09-10 | 2012-11-28 | Mécaplast | Device for controlling a retractable step for accessing a vehicle cab |
CN115419361A (en) * | 2022-09-06 | 2022-12-02 | 贵州电网有限责任公司 | Multifunctional ladder with movable supporting point |
CN115419361B (en) * | 2022-09-06 | 2023-11-17 | 贵州电网有限责任公司 | Multifunctional ladder with movable supporting point |
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