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US 7,311,179 B1Granted
Elevator dampening system
OwnerSamuel H. Franklininventor
Life of this patent
Estimating the term…
Abstract
A dampening device for use with elevator cars or similar devices prevents damage to objects or persons within the elevator car upon failure of a drive chain. A hydraulic motor regulates the rate of descent. The dampening motor is monitored constantly using a pressure gauge.
Claims8
An elevator dampening device comprising:
- a hydraulic motor having an axle;
- a hydraulic fluid reservoir in fluid communication with the hydraulic motor;
- a relief valve in fluid communication with the motor and the reservoir;
- a check valve in fluid communication with the motor and the reservoir;
- hydraulic fluid in the hydraulic fluid reservoir and the motor;
- a cog attached to the axle of the hydraulic motor and the cog having an alternating series of radially projecting teeth and grooves;
- a pair of guide rollers being axially spaced and coaxially parallel;
- a non-rigid track having a series of projecting teeth fitting into the series of grooves on the cog;
- wherein said cog is offset perpendicularly from said axis of said guide rollers;
- wherein said guide rollers cause the track to firmly engage the cog;
- wherein the cog substantially resists downward motion along the track;
- and
- wherein said non-rigid track comprises at least one roller chain attached to a structure above an elevator car containing a load, said at least one roller chain allowing said elevator car to move up and down along said at least one roller chain.
10 more elements
An elevator dampening device comprising:
- a hydraulic motor having an axle;
- a hydraulic fluid reservoir in fluid communication with the hydraulic motor;
- a relief valve in fluid communication with the motor and the reservoir;
- a check valve in fluid communication with the motor and the reservoir;
- a drive pump in fluid communication with the motor and the reservoir;
- hydraulic fluid in the hydraulic fluid reservoir and the motor;
- a cog attached to the axle of the hydraulic motor and the cog having a series of radially projecting teeth;
- a pair of guide rollers being axially spaced and coaxially parallel;
- at least one drive chain having individually addressable links fitted into one another to receive said radially projecting teeth on the cog;
- wherein said cog is offset perpendicularly from said axis of said guide rollers;
- wherein said guide rollers cause the drive chain to firmly engage the cog;
- wherein the cog substantially resists downward motion of the drive chain;
- and,
- wherein the drive pump actuates the cog to cause upward motion of along the drive chain.
11 more elements
Dependencies are inferred from the claim text.