US3674240A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lifting device
Assignee: Individual
•
Filing: 1969-12-15
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Granted: 1972-07-04
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Expires: 1989-12-15
Abstract
Abstract A lifting device provided with a hydraulic unit having a pressure cylinder and a piston rod and a transverse shaft rotatably mounted on the upper end of the piston rod and having affixed thereto two fixed cogwheels, one having a larger diameter than the other, wherein the one cog wheel engages in a fixed rack and the second cog wheel engages in a rack movable vertically with a carrier device. The carrier device is movable vertically along a vertical rail or the like.
Inventors
- 👤 Bertil Ivar Torsten Larsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:10
CPC Classifications
A; A61; A61G; A61G15/00; A61G15/02; F; F15; F15B; F15B15/00; F15B15/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
230 words
A lifting device comprising, a hydraulic cylinder having a fluid-actuated piston reciprocable therein for linear travel, transmission means for converting reciprocable linear travel of said piston into rotary motion, said transmission means comprising two rotatable elements mounted on said piston for axial travel therewith and rotatable in one direction in response to the axial travel of said piston in one direction and rOtatable in an opposite direction of rotation when the piston travels in an opposite direction of axial travel, means in said transmission means including rotational means rotationally connecting said two rotary elements for driving the two rotary elements at a common speed, one of said rotary elements having a larger periphery and thereby a greater peripheral speed, means in said transmission means effective to cause said rotary elements to travel at the same speed of rotation in response to the axial travel of said piston in opposite directions, carrier means coupled to said rotary element having the greater peripheral speed and travelling a greater distance than the travel of said piston in response to said greater peripheral speed, and coupling means in said transmission means coupling said carrier means to said rotary element having the greater peripheral speed and converting the rotary travel of the last-mentioned rotary element to linear travel thereby to move said carrier linearly in opposite directions when said piston is reciprocated in opposite directions.
Claim 2
Dependent Claim
230 words
A lifting device comprising, a hydraulic cylinder having a fluid-actuated piston reciprocable therein for linear travel, transmission means for converting reciprocable linear travel of said piston into rotary motion, said transmission means comprising two rotatable elements mounted on said piston for axial travel therewith and rotatable in one direction in response to the axial travel of said piston in one direction and rOtatable in an opposite direction of rotation when the piston travels in an opposite direction of axial travel, means in said transmission means including rotational means rotationally connecting said two rotary elements for driving the two rotary elements at a common speed, one of said rotary elements having a larger periphery and thereby a greater peripheral speed, means in said transmission means effective to cause said rotary elements to travel at the same speed of rotation in response to the axial travel of said piston in opposite directions, carrier means coupled to said rotary element having the greater peripheral speed and travelling a greater distance than the travel of said piston in response to said greater peripheral speed, and coupling means in said transmission means coupling said carrier means to said rotary element having the greater peripheral speed and converting the rotary travel of the last-mentioned rotary element to linear travel thereby to move said carrier linearly in opposite directions when said piston is reciprocated in opposite directions.
Claim 3
Dependent Claim
77 words
A lifting device according to claim 1, in which the means in the transmission means effective to cause said rotary elements to travel at the same speed of rotation and said rotational means are disposed to coact with said two rotary elements to drive the two rotary elements in the same direction of rotation when the piston travels in one axial direction and in a same opposite direction when the piston travels in an opposite axial direction.
Claim 4
Dependent Claim
40 words
A lifting device according to claim 2, in which said rotary elements are two cog wheels and in which the means effective to cause said rotary elements to travel at the same speed of rotation comprises a fixed gear rack.
Claim 5
Dependent Claim
30 words
A lifting device according to claim 1, in which said coupling means comprises means effecting travelling lineraly of said carrier means in the same general opposite directions as said piston.
Claim 6
Dependent Claim
49 words
A lifting device according to claim 4, in which said carrier means comprises means to support a human being thereon for lifting the human being to different heights, and means to supply fluid to said hydraulic cylinder to effect travel of said piston to controllably determine said different heights.
Claim 7
Dependent Claim
26 words
A lifting device according to claim 4, in which said rotary elements comprise cog wheels and in which said coupling means comprises a movable gear rack.
Claim 8
Dependent Claim
47 words
A lifting device according to claim 4, in which said carrier means is guided for linear travel, means guiding the support means for axial travel in the same general directions as said piston, and means balancing forces developed in lifting a weight supported on said carrier means.
Claim 9
Dependent Claim
43 words
A lifting device according to claim 7, in which said means to balance said forces comprises a plurality of rotatably mounted rollers travelling with said carrier means during its linear travel, and a vertical guide rail having inclined surfaces engaged by said rollers.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |