Patent US4807720A successfully refreshed from Google Patents.
US4807720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ladder leveling attachment
Assignee: Individual
•
Filing: 1988-01-15
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Granted: 1989-02-28
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Expires: 2008-01-15
Abstract
Abstract A ladder leveling attachment (10) for adjusting the length of one or both legs of a ladder (L) to compensate for uneven surfaces, has a housing (11) with means (12, 13, 14) for securing it to a leg of a ladder, and an extendible leg (15) is telescopically received in the housing for movement inwardly and outwardly of the housing to selectively increase or decrease the length of the leg. A plurality of angled notches or slots (25) are formed in the housing and a spring-biased latching pin (35) is carried by the extendible leg and is adapted to engage in the slots for latching the extendible leg in an adjusted position. The opposite ends (38, 39) of the latching pin project outwardly beyond the opposite sides of the housing and may be grasped in one hand to release the latching pin from the slots to move the extendible leg along channels (24) to a new position. Thereafter, the pin is simply released and the spring urges the pin into seated engagement in adjacent notches (25).
Inventors
- 👤 Soon Y. Kim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:46
CPC Classifications
E; E06; E06C; E06C7/00; E06C7/42; E06C7/44
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
216 words
A ladder leveling attachment, comprising: a hollow housing having an upper end and a lower end and having mounting means on the upper and lower ends thereof for attaching the housing to the leg of a ladder, said housing having a front wall, opposite side walls and a back wall which is disposed adjacent the leg of a ladder when the attachment is in use, an elongate channel in each of the opposite side walls extending along the length of the housing, and a plurality of upwardly angled notches in each side wall, communicating at one end with a respective channel and extending at their other end into close proximity with the back wall; an extendible leg telescopically received in the housing and having a lower end projecting beyond the lower end of the housing for engaging a surface on which the ladder is placed; and a latching pin carried by the extendible leg and extending transversely through the housing and leg, with opposite ends received in the notches in the housing to latch the leg in an adjusted position relative to the housing and ladder, said pin being movable out of said notches and into and along said channels for movement into a different notch to latch said extendible leg in a different adjusted position.
Claim 2
Dependent Claim
216 words
A ladder leveling attachment, comprising: a hollow housing having an upper end and a lower end and having mounting means on the upper and lower ends thereof for attaching the housing to the leg of a ladder, said housing having a front wall, opposite side walls and a back wall which is disposed adjacent the leg of a ladder when the attachment is in use, an elongate channel in each of the opposite side walls extending along the length of the housing, and a plurality of upwardly angled notches in each side wall, communicating at one end with a respective channel and extending at their other end into close proximity with the back wall; an extendible leg telescopically received in the housing and having a lower end projecting beyond the lower end of the housing for engaging a surface on which the ladder is placed; and a latching pin carried by the extendible leg and extending transversely through the housing and leg, with opposite ends received in the notches in the housing to latch the leg in an adjusted position relative to the housing and ladder, said pin being movable out of said notches and into and along said channels for movement into a different notch to latch said extendible leg in a different adjusted position.
Claim 3
Dependent Claim
29 words
A ladder leveling attachment as claimed in claim 1, wherein: spring means is engaged with said latching pin to urge it into the notches in the housing side wall.
Claim 4
Dependent Claim
84 words
A ladder leveling attachment as claimed in claim 2, wherein: the extendible leg has a front wall, a back wall and opposite side walls with a size and shape to be closely slidably received in the housing; and said side walls have elongate slots therein extending from the back wall toward the front wall, said latching pin being received in said slots, and said slots having a length to enable said latching pin to be disengaged from the notches in the housing side walls.
Claim 5
Dependent Claim
81 words
A ladder leveling attachment as claimed in claim 3, wherein: a spring retaining bar extends between the side walls of the extendible leg closely adjacent the back wall thereof and spaced upwardly of the slots and latching pin, said spring means comprising a coil spring having one end attached to the spring retaining bar and the other end attached to the latching pin, whereby the spring urges the latching pin upwardly and rearwardly with respect to the housing and extendible leg.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-02-28 | 1992-08-29 | 1993-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-28 | 1996-08-29 | 1997-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-28 | 2000-08-29 | 2001-02-28 | $7700.00 | Window Closed / Lapsed |