GB1455254A - Safety gear for lifts - Google Patents
Safety gear for liftsInfo
- Publication number
- GB1455254A GB1455254A GB5789872A GB5789872A GB1455254A GB 1455254 A GB1455254 A GB 1455254A GB 5789872 A GB5789872 A GB 5789872A GB 5789872 A GB5789872 A GB 5789872A GB 1455254 A GB1455254 A GB 1455254A
- Authority
- GB
- United Kingdom
- Prior art keywords
- platform
- pulley
- actuator
- chains
- switch
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
- B66B5/02—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions
- B66B5/028—Safety devices separate from control system in case of power failure, for hydraulical lifts, e.g. braking the hydraulic jack
Landscapes
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
1455254 Latch gear G C RAWLINS 30 Nov 1973 [15 Dec 1972] 57898/72 Heading B8L Safety cut-out in a hydraulically actuated lift comprising a platform 6 movable along guides 8 by a pair of hydraulic actuators 10 disposed on opposite sides of the platform and connected therewith by chains 13 passing over sprockets 12 mounted on the head of the actuator, comprises an auxiliary pulley 18 mounted in a housing 21, itself being slidably mounted at the head of the actuator and biased by a spring 22 into an end position. A cable wire or rope 19 passes over the pulley 18 and is secured at opposite ends to the actuator and the platform and during the normal operation of the lift applies no load to the pulley 18. When, however, one or both of the chains 13 break the weight of the platform is transferred to the cable &c. which thus deflects the pulley against the bias so that a collar 25, mounted coaxial with the pulley closes a switch 26 to switch off a pump supplying fluid to the actuators. External means (not shown) may then be used to actuate the hydraulics to lower the platform.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB5789872A GB1455254A (en) | 1972-12-15 | 1972-12-15 | Safety gear for lifts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB5789872A GB1455254A (en) | 1972-12-15 | 1972-12-15 | Safety gear for lifts |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1455254A true GB1455254A (en) | 1976-11-10 |
Family
ID=10480314
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5789872A Expired GB1455254A (en) | 1972-12-15 | 1972-12-15 | Safety gear for lifts |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1455254A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4499971A (en) * | 1983-04-22 | 1985-02-19 | Crown Controls Corporation | Material handling vehicle having improved chain monitoring |
| CN108394783A (en) * | 2018-01-29 | 2018-08-14 | 卢渭彬 | A kind of building construction hoist rope broken protector |
-
1972
- 1972-12-15 GB GB5789872A patent/GB1455254A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4499971A (en) * | 1983-04-22 | 1985-02-19 | Crown Controls Corporation | Material handling vehicle having improved chain monitoring |
| CN108394783A (en) * | 2018-01-29 | 2018-08-14 | 卢渭彬 | A kind of building construction hoist rope broken protector |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PE20 | Patent expired after termination of 20 years |
Effective date: 19931129 |