Patent US3735838A successfully refreshed from Google Patents.
US3735838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wheeled ladder with a weight actuated self-locking wheel thereon
Assignee: EVERETT SOUND MACHINE WORKS
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Filing: 1972-05-22
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Granted: 1973-05-29
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Expires: 1992-05-22
Abstract
Abstract The ladder is elevated above its supporting surface and has an arm pivotally mounted on the lower end portion thereof, which is yieldably biased in one angular direction thereof, into a stopped position on the ladder. The arm in turn has a surface engaging wheel thereon, which is rotatably mounted about an axis that is spaced apart from the pivotal axis of the arm, at a point on the arm at which the wheel supports the ladder above the surface in response to the bias on the arm. When the user''s weight is added to the ladder, the wheel is restrained against rotation by an element which is disposed on the ladder so as to engage the wheel when the arm and the ladder are pivoted in relation to one another in the direction opposed to the bias on the arm. However, there are means on the ladder whereby the restrainer element can be disengaged from the wheel under the condition in which the element and the arm are displaced in relation to one another in the direction opposed to the bias on the arm. Therefore, the wheel can be released for rotation even while the user remains on the ladder.
Inventors
- 👤 Jack W. Greenleaf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:35
CPC Classifications
E; E06; E06C; E06C1/00; E06C1/02; E06C1/38; E06C1/397
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
196 words
In combination, a ladder elevated above its supporting surface, an arm pivotally mounted on the lower end portion of the laddEr, which is yieldably biased in one angular direction thereof, into a stopped position on the ladder, and which has a surface engaging wheel thereon, which is rotatably mounted about an axis that is spaced apart from the pivotal axis of the arm, at a point on the arm at which the wheel supports the ladder above the surface in response to the bias on the arm, means for restraining the wheel against rotation when the user''s weight is added to the ladder, including an element which is disposed on the ladder so as to engage the wheel when the arm and the ladder are pivoted in relation to one another in the direction opposed to the bias on the arm, and means on the ladder whereby the restrainer element can be disengaged from the wheel when the element and the arm are displaced in relation to one another in the direction opposed to the bias on the arm, so that the wheel can be released for rotation even while the user remains on the ladder.
Claim 2
Dependent Claim
196 words
In combination, a ladder elevated above its supporting surface, an arm pivotally mounted on the lower end portion of the laddEr, which is yieldably biased in one angular direction thereof, into a stopped position on the ladder, and which has a surface engaging wheel thereon, which is rotatably mounted about an axis that is spaced apart from the pivotal axis of the arm, at a point on the arm at which the wheel supports the ladder above the surface in response to the bias on the arm, means for restraining the wheel against rotation when the user''s weight is added to the ladder, including an element which is disposed on the ladder so as to engage the wheel when the arm and the ladder are pivoted in relation to one another in the direction opposed to the bias on the arm, and means on the ladder whereby the restrainer element can be disengaged from the wheel when the element and the arm are displaced in relation to one another in the direction opposed to the bias on the arm, so that the wheel can be released for rotation even while the user remains on the ladder.
Claim 3
Dependent Claim
69 words
The combination according to claim 1 wherein the wheel has a series of recesses therein which are relatively angularly disposed about the rotational axis of the wheel, and there is a lug which is disposed on the ladder so as to engage one of the recesses when the arm and the ladder are pivoted in relation to one another in the direction opposed to the bias on the arm.
Claim 4
Dependent Claim
53 words
The combination according to claim 2 wherein the lug is disposed on a dog which is pivotally mounted on the lower end portion of the ladder in a plane parallel to that of the arm, and yieldably biased in the same angular direction as the arm, into a stopped position on the ladder.
Claim 5
Dependent Claim
51 words
The combination according to claim 3 wherein the dog has an actuator connected therewith, which extends lengthwise of the ladder, to points on the upper end portion thereof, and is manually operable at any one of the aforesaid points to pivot the dog in the direction opposed to the bias thereon.
Claim 6
Dependent Claim
21 words
The combination according to claim 3 wherein the dog and the arm are pivotally mounted on one standard of the ladder.
Claim 7
Dependent Claim
23 words
The combination according to claim 5 wherein the axes of the dog, the arm, and the wheel are all parallel to one another.
Claim 8
Dependent Claim
26 words
The combination according to claim 3 wherein the recesses with which the lug is engageable are defined by a ratchet on one side of the wheel.
Claim 9
Dependent Claim
15 words
The combination according to claim 1 wherein the ladder is movably suspended from a track.
Claim 10
Dependent Claim
141 words
The combination according to claim 8 wherein the track is elongated, V-shaped, and has a longitudinally extending slot in the bottom thereof, between the angularly related surfaces thereof, and there is a carriage on the track including a pair of relatively inner and outer rotationably engaged members which are disposed above the track, and the outer of which has a device suspended therefrom in the slot, on which the ladder is hung, the inner member being elongated on a parallel to the track, and having longitudinal spaced recesses therein, which are disposed at relatively angularly spaced points thereabout, and a plurality of track engaging wheels thereon, in the recesses, which are rotatably mounted about axes that extend substantially parallel to alternate surfaces of the track, as the wheels are considered from one recess to the next, lengthwise of the inner member.
Claim 11
Dependent Claim
194 words
In combination, a standard elevated above its supporting surface, an arm pivotally mounted on the lower end portion of the standard, which is yieldably biased in one angular direction thereof, into a stopped position on the standard, and has a surface engaging wheel thereon, which is rotatably mounted about an axis that is spaced apart from the pivotal axis of the arm, at a point on the arm at which the wheel supports the standard above the surface in response to the bias on the arm, means for restraining the wheel against rotation when a weight is added to the standard, including an element which is disposed on the standard so as to engage the wheel when the arm and the standard are pivoted in relation to one another in the directIon opposed to the bias on the arm, and means on the standard whereby the restrainer element can be disengaged from the wheel when the element and the arm are displaced in relation to one another in the direction opposed to the bias on the arm, so that the wheel can be released for rotation even while the weight remains on the standard.
Claim 12
Dependent Claim
194 words
In combination, a standard elevated above its supporting surface, an arm pivotally mounted on the lower end portion of the standard, which is yieldably biased in one angular direction thereof, into a stopped position on the standard, and has a surface engaging wheel thereon, which is rotatably mounted about an axis that is spaced apart from the pivotal axis of the arm, at a point on the arm at which the wheel supports the standard above the surface in response to the bias on the arm, means for restraining the wheel against rotation when a weight is added to the standard, including an element which is disposed on the standard so as to engage the wheel when the arm and the standard are pivoted in relation to one another in the directIon opposed to the bias on the arm, and means on the standard whereby the restrainer element can be disengaged from the wheel when the element and the arm are displaced in relation to one another in the direction opposed to the bias on the arm, so that the wheel can be released for rotation even while the weight remains on the standard.
Claim 13
Dependent Claim
139 words
In combination, a track which is elongated, V-shaped, and has a longitudinally extending slot in the bottom thereof, between the angularly related surfaces thereof, and a carriage for supporting a body on the track, including a pair of relatively inner and outer rotatably engaged members which are disposed above the track, and the outer of which has a device suspended therefrom in the slot, on which the body is hung, the inner member being elongated on a parallel to the track, and having longitudinally spaced recesses therein, which are disposed at relatively angularly spaced points thereabout, and a plurality of track engaging wheels thereon, in the recesses, which are rotatably mounted about axes which extend substantially parallel to alternate surfaces of the track, as the wheels are considered from one recess to the next, lengthwise of the inner member.
Claim 14
Dependent Claim
139 words
In combination, a track which is elongated, V-shaped, and has a longitudinally extending slot in the bottom thereof, between the angularly related surfaces thereof, and a carriage for supporting a body on the track, including a pair of relatively inner and outer rotatably engaged members which are disposed above the track, and the outer of which has a device suspended therefrom in the slot, on which the body is hung, the inner member being elongated on a parallel to the track, and having longitudinally spaced recesses therein, which are disposed at relatively angularly spaced points thereabout, and a plurality of track engaging wheels thereon, in the recesses, which are rotatably mounted about axes which extend substantially parallel to alternate surfaces of the track, as the wheels are considered from one recess to the next, lengthwise of the inner member.
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) | 1976-05-28 | 1976-11-27 | 1977-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-28 | 1980-11-27 | 1981-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-28 | 1984-11-27 | 1985-05-29 | $7700.00 | Window Closed / Lapsed |