US3743344A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Construction of a trolley
Assignee: Centre for Research in Engineering Surface Technology
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Filing: 1971-08-23
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Granted: 1973-07-03
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Expires: 1991-08-23
Abstract
Abstract A trolley for use particularily with ambulances and in hospitals which can be readily raised or lowered, fully collapsed to act as a stretcher, or folded to lie on a raised platform, the trolley having a stretcher framework which has two pairs of pivotally mounted wheel supporting legs. The legs on each side of the trolley engage in a scissors like manner and are adapted for relative movement to raise and lower the trolley so that the stretcher framework is always horizontal. Means are also provided to allow the legs to be folded rapidly.
Inventors
- 👤 G Jameson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:36
CPC Classifications
A; A61; A61G; A61G1/00; A61G1/04; A61G1/052; A61G1/056; A61G1/0565; A61G1/0567; A61G1/013; A61G1/02; A61G1/0206; A61G1/0212; A61G1/0231; A61G1/025; A61G1/0262
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
191 words
A trolley for use particularly with ambulances and in hospitals which comprises; a stretcher framework; a pair of front legs pivotally mounted on the stretcher framework; a pair or rear legs pivotally mounted on the stretcher framework, each rear leg crossing in a scissors like manner the front leg on the same side of the trolley; means for releasably interconnecting on each side of the trolley the front and rear legs, said means for releasably interconnecting on each side of the trolley the front and rear leg comprises; a wheel mounted on the rear leg; a curved guide track mounted on the front leg whereby the track engages and rests upon the wheel; the shape of the track being such that as the trolley is raised or lowered the stretcher framework remains substantially horizontal; and means for moving the wheel relative to the rear leg for disengagement with the track; leg movement control means on the stretcher framework for raising and lowering the trolley maintaining the stretcher framework substantially horizontal and a stay member pivotally mounted on one of the pairs of legs and connected to the leg movement control means.
Claim 2
Dependent Claim
191 words
A trolley for use particularly with ambulances and in hospitals which comprises; a stretcher framework; a pair of front legs pivotally mounted on the stretcher framework; a pair or rear legs pivotally mounted on the stretcher framework, each rear leg crossing in a scissors like manner the front leg on the same side of the trolley; means for releasably interconnecting on each side of the trolley the front and rear legs, said means for releasably interconnecting on each side of the trolley the front and rear leg comprises; a wheel mounted on the rear leg; a curved guide track mounted on the front leg whereby the track engages and rests upon the wheel; the shape of the track being such that as the trolley is raised or lowered the stretcher framework remains substantially horizontal; and means for moving the wheel relative to the rear leg for disengagement with the track; leg movement control means on the stretcher framework for raising and lowering the trolley maintaining the stretcher framework substantially horizontal and a stay member pivotally mounted on one of the pairs of legs and connected to the leg movement control means.
Claim 3
Dependent Claim
59 words
A trolley as recited in claim 1 wherein the rear leg has an elongated slot downwardly inclined to the longitudinal axis of the rear leg and having a downwardly directed recess at its end nearer to where the rear leg is pivotally mounted on the stretcher framework aNd the wheel is mounted on an axle which engages the slot.
Claim 4
Dependent Claim
57 words
A trolley as recited in claim 2 wherein the means for moving the wheel relative to the rear leg for disengagement with the curved track comprises: a cranked lever pivotally mounted on the rear leg adjacent the recess in the slot; and means for pivoting the lever against the wheel to force it out of the recess.
Claim 5
Dependent Claim
34 words
A trolley as recited in claim 3 wherein latch means are provided on the stretcher framework for releasably engaging the cranked lever when the legs are pivoted upwards to lie along the stretcher framework.
Claim 6
Dependent Claim
63 words
A trolley as recited in claim 1 wherein the leg movement control means comprises: means for slidably mounting the stay member on the stretcher framework; a block, having a threaded hole, releasably connected to the stay member; a lead screw mounted on the stretcher framework and engaging the threaded hole; and means for preventing rotation of the block relative to the stretcher framework.
Claim 7
Dependent Claim
109 words
A trolley as recited in claim 5 wherein: the stretcher framework is provided with a pair of parallel longitudinal rails which the stay member engages and depends from, whereby the stay member is permitted limited movement away from the rails; a pair of inwardly directed lugs are secured to the stay member; and a cover member is pivotally mounted on the block, the cover member having a pair of cut-out slots for engagement with the lugs, the dimensions of the slots being such that the cover member can only be pivoted out of engagement with the lugs when the stay member is depending and spaced apart from the rails.
Claim 8
Dependent Claim
62 words
A trolley as recited in claim 1 wherein the leg movement control means comprises: means for slidably mounting the stay member on the stretcher framework; a block, having a threaded hole, connected to the stay member; a lead screw mounted on the stretcher framework and engaging the threaded hole; and means for preventing rotation of the block relative to the stretcher framework.
Claim 9
Dependent Claim
109 words
A trolley as recited in claim 7 wherein: the stretcher framework is provided with a pair of parallel longitudinal rails which the stay member engages and depends from, whereby the stay member is permitted limited movement away from the rails; a pair of inwardly directed lugs are secured to the stay member; and a cover member is pivotally mounted on the block, the cover member having a pair of cut-out slots for engagement with the lugs, the dimensions of the slots being such that the cover member can only be pivoted out of engagement with the lugs when the stay member is depending and spaced apart from the rails.
Claim 10
Dependent Claim
62 words
A trolley as recited in claim 2 wherein the leg movement control means comprises: means for slidably mounting the stay member on the stretcher framework; a block, having a threaded hole, connected to the stay member; a lead screw mounted on the stretcher framework and engaging the threaded hole; and means for preventing rotation of the block relative to the stretcher framework.
Claim 11
Dependent Claim
109 words
A trolley as recited in claim 9 wherein: the stretcher framework is provided with a pair of parallel longitudinal rails which the stay member engages and depends from, whereby the stay member is permitted limited movement away from the rails; a pair of inwardly directed lugs are secured to the stay member; and a cover member is pivotally mounted on the block, the cover member having a pair of cut-out slots for engagement with the lugs, the dimensions of the slots being such that the cover member can only be pivoted out of engagement with the lugs when the stay member is depending and spaced apart from the rails.
Claim 12
Dependent Claim
62 words
A trolley as recited in claim 3 wherein the leg movement control means comprises: means for slidably mounting the stay member on the stretcher framework; a block, having a threaded hole, connected to the stay member; a lead screw mounted on the stretcher framework and engAging the threaded hole; and means for preventing rotation of the block relative to the stretcher framework.
Claim 13
Dependent Claim
109 words
A trolley as recited in claim 11 wherein: the stretcher framework is provided with a pair of parallel longitudinal rails which the stay member engages and depends from, whereby the stay member is permitted limited movement away from the rails; a pair of inwardly directed lugs are secured to the stay member; and a cover member is pivotally mounted on the block, the cover member having a pair of cut-out slots for engagement with the lugs, the dimensions of the slots being such that the cover member can only be pivoted out of engagement with the lugs when the stay member is depending and spaced apart from the rails.
Claim 14
Dependent Claim
22 words
A trolley as recited in claim 12 wherein the stretcher framework is provided with one or more wheels adjacent its front end.
Claim 15
Dependent Claim
30 words
A trolley as recited in claim 12 wherein a handle is provided on each of the rear legs to facilitate movement of the trolley and pivoting of the rear legs.
References Cited (Backward Citations)
US2319008A
Cited
US3082016A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |