US3850263A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for fire escaping from high building
Assignee: JOHNSON ENTERPRISE CO Ltd
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Filing: 1973-11-08
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Granted: 1974-11-26
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Expires: 1993-11-08
Abstract
Abstract Apparatus for fire escaping from a high building comprising a frame, a winch rotatably mounted on said frame, a gear train driven by the winch shaft, a pair of parallelly disposed screw rods having threads in reverse direction to each other and being driven by said gear train, a plate with a pair of nuts matching said pair of reversely threaded screw rods and slidably mounted thereon, a hydraulic cylinder having a piston driven by the slide motion of the plate, a hydraulic selecting pump actuated by said hydraulic cylinder, a brake control cylinder actuated by said selecting pump, and a brake assembly controlling the rotation of said winch, whereby upon the rotation of the winch caused by the unwinding of the winch cable due to the falling of an escaper hanging on the cable end, pressure is built up in the hydraulic cylinder and passes through the selecting pump to actuate the brake assembly to stop the motion of the winch and the falling of the escaper. Upon release of the brake assembly the winch resumes rotation to start the whole cycle all over again, so that the escaper reaches the ground in intermittent stop-and-go intervals without undergoing gravitational acceleration.
Inventors
- 👤 S Chin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:03
CPC Classifications
A; A62; A62B; A62B1/00; A62B1/06; A62B1/08; A62B1/12
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
200 words
Apparatus for fire escaping from a high building comprising a frame, a winch having a cable thereon rotatably mounted on said frame, a gear train driven by said winch, a pair of parallelly disposed screw rods having threads in reversed direction to each other and being driven by said gear train, a plate with a pair of nuts matching said pair of reversely threaded screw rods and slidably mounted thereon, a hydraulic cylinder having a piston driven by the slide motion of said plate, a hydraulic selecting pump actuated by said hydraulic cylinder, a brake control cylinder actuated by said selecting pump, and a brake assembly controlling the rotation of said winch, whereby upon rotation of the winch caused by the unwinding of the winch cable due to the falling of an escaper hanging on the cable end, pressure is built up in the hydraulic cyinder and passes through the selecting pump to actuate the brake assembly to stop the motion of the winch, and upon release of said brake assembly, rotation of the winch is resumed to start the whole cycle all over again so that the escaper reaches the ground in intermittent stop-and-go intervals without undergoing gravitational acceleration.
Claim 2
Dependent Claim
200 words
Apparatus for fire escaping from a high building comprising a frame, a winch having a cable thereon rotatably mounted on said frame, a gear train driven by said winch, a pair of parallelly disposed screw rods having threads in reversed direction to each other and being driven by said gear train, a plate with a pair of nuts matching said pair of reversely threaded screw rods and slidably mounted thereon, a hydraulic cylinder having a piston driven by the slide motion of said plate, a hydraulic selecting pump actuated by said hydraulic cylinder, a brake control cylinder actuated by said selecting pump, and a brake assembly controlling the rotation of said winch, whereby upon rotation of the winch caused by the unwinding of the winch cable due to the falling of an escaper hanging on the cable end, pressure is built up in the hydraulic cyinder and passes through the selecting pump to actuate the brake assembly to stop the motion of the winch, and upon release of said brake assembly, rotation of the winch is resumed to start the whole cycle all over again so that the escaper reaches the ground in intermittent stop-and-go intervals without undergoing gravitational acceleration.
Claim 3
Dependent Claim
27 words
The apparatus according to claim 1, wherein at the free end of the cable a sling is provided for attaching a safety belt or other rescuing aids.
Claim 4
Dependent Claim
33 words
The apparatus according to claim 1, wherein the dimensions and pitches of said pair of screw rods are similar, the rotation of each rod being at the same speed but in opposite direction.
Claim 5
Dependent Claim
57 words
The apparatus according to claim 1, wherein the pair of nuts have threads in reverse direction to each other so as to match with the said pair of screw rods, the plate being normally located at the end of the screw rod pair and having the end of a piston rod of said hydraulic cylinder connected thereto.
Claim 6
Dependent Claim
165 words
The apparatus according to claim 1, wherein the hydraulic selecting pump comprises a cylinder body having a fluid inlet hole at its front end, a leakage hole of smaller diameter and an outlet hole of bigger diameter disposed at the side wall of the cylinder body; a piston slidably inserted inside the front end of the cylinder, a piston rod, a flange and a threaded portion being disposed at the middle portion of the piston rod; a sleeve threaded on the outside of a projecting portion of the cylinder body; an adjusting screw threaded on the inside of said projecting portion, an opening being provided at the center of the said adjusting screw to facilitate the passing through of a free end of said piston rod; a movable spring retainer threaded on the threaded portion of said piston rod; a fixed spring retainer threaded at the end of the said sleeve; and a spiral return spring retained between the said movable and fixed spring retainers.
Claim 7
Dependent Claim
130 words
The apparatus according to claim 1, wherein the brake control cylinder comprises a cylinder body having a fluid inlet hole at its top, and a projecting portion at the lower end of the cylinder body; a piston and a piston rod slidably retained inside the cylinder body, the lower portion of the piston rod being threaded and extending downwardly outside the cylinder body; a sleeve threaded on the outside of the projecting portion; a movable spring retainer threaded on the top of the threaded portion of the piston rod; a fixed spring retainer threaded at the lower part of the sleeve; and a spiral spring retained between said movable and fixed spring retainers; the lower end of said piston rod being connected to a brake band of the brake assembly.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |