US4984655A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ladder adjustment apparatus
Assignee: Individual
•
Filing: 1990-02-23
•
Granted: 1991-01-15
•
Expires: 2010-02-23
Abstract
Abstract A ladder adjustment apparatus (10) which is designed to be secured to the rungs (101) of a ladder (100) whereby the apparatus (10) may be laterally shifted on the rungs (101) to position the apparatus (10) adjacent either leg (102) of the ladder without the need for physically detaching the apparatus (10) from the ladder (100).
Inventors
- 👤 Mark D. Scherer
- 👤 Thomas A. Hoy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:56
CPC Classifications
E; E06; E06C; E06C7/00; E06C7/42; E06C7/44
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
158 words
A ladder adjustment apparatus for ladders having a pair of vertical legs connected together by rungs wherein the ladder adjustment apparatus comprises: an outer tubing member provided with a pair of rung capturing members which are adapted to captively engage rungs on said ladder; wherein the pair of rung capturing members comprise: a stationary rung capturing member disposed at a fixed location on the outer tubing member; and, an adjustable rung capturing member which is vertically displaceable relative to said outer tubing member; wherein both of said rung capturing members are rotatably disposed relative to said outer tubing member; an inner tubing member slideably disposed within said outer tubing member and provided with a foot element on the lower end of the inner tubing member; and a locking unit operatively associated with said inner and outer tubing members for varying the relative position between the inner and outer tubing members to adjust the vertical height of the apparatus.
Claim 2
Dependent Claim
158 words
A ladder adjustment apparatus for ladders having a pair of vertical legs connected together by rungs wherein the ladder adjustment apparatus comprises: an outer tubing member provided with a pair of rung capturing members which are adapted to captively engage rungs on said ladder; wherein the pair of rung capturing members comprise: a stationary rung capturing member disposed at a fixed location on the outer tubing member; and, an adjustable rung capturing member which is vertically displaceable relative to said outer tubing member; wherein both of said rung capturing members are rotatably disposed relative to said outer tubing member; an inner tubing member slideably disposed within said outer tubing member and provided with a foot element on the lower end of the inner tubing member; and a locking unit operatively associated with said inner and outer tubing members for varying the relative position between the inner and outer tubing members to adjust the vertical height of the apparatus.
Claim 3
Dependent Claim
21 words
The apparatus as in claim 1 wherein said foot element comprises an elongated foot member pivotally attached to a tubular member.
Claim 4
Dependent Claim
49 words
The apparatus as in claim 2 wherein said tubular member and the lower portion of said inner tubing member are provided with a plurality of aligned apertures which are dimensioned to receive a locking pin for varying the alignment of the foot element relative to the inner tubing member.
Claim 5
Dependent Claim
18 words
The apparatus as in claim 1 wherein said inner and outer tubing members have a generally rectangular configuration.
Claim 6
Dependent Claim
32 words
The apparatus as in claim 4 wherein the outer tubing member is provided with an elongated aperture having a pair of toothed strip elements disposed along the sides of the elongated aperture.
Claim 7
Dependent Claim
32 words
The apparatus as in claim 5 wherein the locking unit comprises: a generally rectangular locking plate having a plurality of teeth dimensioned to engage the toothed strips on said outer tubing member.
Claim 8
Dependent Claim
54 words
The apparatus as in claim 6 wherein the locking unit further comprises: an elongated handle member having a threaded rod which passes through said locking plate and the elongated aperture in the outer tubing member and into the inner tubing member for moving the toothed surfaces into and out of engagement with one another.
Claim 9
Dependent Claim
41 words
The apparatus as in claim 7 wherein the outer tubing member is further provided with a pair of flanges which flank the toothed strips; and wherein the flanges are spaced from one another to slideably receive the generally rectangular locking plate.
Claim 10
Dependent Claim
70 words
The apparatus as in claim 1 wherein each of said rung capturing members comprises: a base mounted on a stem that is operatively attached to the outer tubing member; a bolt member and a latch member hingedly connected on the opposite ends of the base, wherein the latch member is configured to receive the bolt member; and, locking means for captively engaging the bolt member relative to the latch member.
Claim 11
Dependent Claim
18 words
The apparatus as in claim 1 wherein the adjustable rung capturing member is provided with a lock mechanism.
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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) | 1994-01-14 | 1994-07-16 | 1995-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-14 | 1998-07-16 | 1999-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-14 | 2002-07-16 | 2003-01-15 | $7700.00 | Window Closed / Lapsed |