Patent US5718306A successfully refreshed from Google Patents.
US5718306A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ladder leveling device
Assignee: Individual
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Filing: 1995-12-29
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Granted: 1998-02-17
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Expires: 2015-12-29
Abstract
Abstract A ladder leveling device is provided with an integrally formed tubular guide, a locking mechanism, a support shaft and a pivot foot. The tubular guide is attached to a ladder through its base portion. A guide bore is provided in the tubular guide for receiving the support shaft which may slide within the guide bore. A locking mechanism is housed in a lock portion of the tubular guide. The locking mechanism locks the support shaft in a fixed position relative to the tubular guide. The lock portion of the tubular guide protects the locking mechanism from foreign objects and reduces the risk of accidental release. A hole is provided on the side and rear surfaces of the lock portion for operating the locking mechanism and further increasing the safety and ease of use of the invention.
Inventors
- 👤 Gerald Baker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:50
CPC Classifications
E; E06; E06C; E06C7/00; E06C7/42; E06C7/44
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
243 words
A ladder leveling device for supporting a ladder in a substantially vertical position on an uneven surface comprising: (a) an extruded tubular guide having an integrally formed base portion, lock portion and guide bore, (b) securing means associated with said base portion for securing said tubular guide to a ladder, (c) a support shaft for adjustably supporting said ladder when said ladder leveling device is attached to said ladder, said support shaft being slidably secured in said guide bore, (d) a locking mechanism housed within said lock portion for locking said support shaft in a fixed position relative to said tubular guide whereby said fixed position is selected from a plurality of possible positions, and (e) a pivot foot, pivotally attached to said support shaft for supporting said ladder on a working surface, wherein said lock portion comprises a housing defining an inner chamber, said locking mechanism being located in said inner chamber and shielded from foreign objects whereby said locking mechanism is resistant to accidental release, wherein said locking mechanism comprises a trigger for operating said locking mechanism, said housing of said lock portion comprises a front wall, a rear wall, a side wall, and a trigger hole for providing access to said trigger, said trigger hole being located only in said rear and side walls, whereby said trigger is shielded from foreign objects, said locking mechanism is further resistant to accidental release, and said trigger is easily operated by a person.
Claim 2
Dependent Claim
243 words
A ladder leveling device for supporting a ladder in a substantially vertical position on an uneven surface comprising: (a) an extruded tubular guide having an integrally formed base portion, lock portion and guide bore, (b) securing means associated with said base portion for securing said tubular guide to a ladder, (c) a support shaft for adjustably supporting said ladder when said ladder leveling device is attached to said ladder, said support shaft being slidably secured in said guide bore, (d) a locking mechanism housed within said lock portion for locking said support shaft in a fixed position relative to said tubular guide whereby said fixed position is selected from a plurality of possible positions, and (e) a pivot foot, pivotally attached to said support shaft for supporting said ladder on a working surface, wherein said lock portion comprises a housing defining an inner chamber, said locking mechanism being located in said inner chamber and shielded from foreign objects whereby said locking mechanism is resistant to accidental release, wherein said locking mechanism comprises a trigger for operating said locking mechanism, said housing of said lock portion comprises a front wall, a rear wall, a side wall, and a trigger hole for providing access to said trigger, said trigger hole being located only in said rear and side walls, whereby said trigger is shielded from foreign objects, said locking mechanism is further resistant to accidental release, and said trigger is easily operated by a person.
Claim 3
Dependent Claim
221 words
A ladder leveling device for supporting a ladder in a substantially vertical position on an uneven surface comprising: (a) an extruded tubular guide having a base portion, lock portion and guide bore, said lock portion comprising a housing defining an inner chamber, (b) securing means associated with said base portion for securing said tubular guide to a ladder, (c) a support shaft for supporting said ladder when said ladder leveling device is attached to said ladder, said support shaft being slidably received in said guide bore, (d) a locking mechanism for locking said support shaft in a fixed position relative to said tubular guide, said locking mechanism being located substantially within said inner chamber whereby said fixed position is selected from a plurality of possible positions to level said ladder and said locking mechanism is protected by said housing and resistant to accidental release, and (e) a pivot foot, pivotally attached to said support shaft for supporting said ladder on a working surface, wherein said locking mechanism comprises a trigger for operating said locking mechanism, said housing of said lock portion comprises a front wall, a rear wall, a side wall, and a trigger hole for providing access to said trigger, said trigger hole being located on said rear and side walls, whereby said trigger is easily operated by a person.
Claim 4
Dependent Claim
221 words
A ladder leveling device for supporting a ladder in a substantially vertical position on an uneven surface comprising: (a) an extruded tubular guide having a base portion, lock portion and guide bore, said lock portion comprising a housing defining an inner chamber, (b) securing means associated with said base portion for securing said tubular guide to a ladder, (c) a support shaft for supporting said ladder when said ladder leveling device is attached to said ladder, said support shaft being slidably received in said guide bore, (d) a locking mechanism for locking said support shaft in a fixed position relative to said tubular guide, said locking mechanism being located substantially within said inner chamber whereby said fixed position is selected from a plurality of possible positions to level said ladder and said locking mechanism is protected by said housing and resistant to accidental release, and (e) a pivot foot, pivotally attached to said support shaft for supporting said ladder on a working surface, wherein said locking mechanism comprises a trigger for operating said locking mechanism, said housing of said lock portion comprises a front wall, a rear wall, a side wall, and a trigger hole for providing access to said trigger, said trigger hole being located on said rear and side walls, whereby said trigger is easily operated by a person.
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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) | 2001-02-16 | 2001-08-18 | 2002-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-02-16 | 2005-08-18 | 2006-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-02-16 | 2009-08-18 | 2010-02-17 | $7700.00 | Window Closed / Lapsed |