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Class Information
Number: 182/205
Name: Fire escape, ladder, or scaffold > Ladder > Supporting surface compensating means > Stile extension > Increment adjustment > Ratchet type
Description: Device wherein the incremental adjustment is by means of a ratchet-like structure.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 6745870 |
Adjustable ladder support |
Jun. 8, 2004 |
| 6478113 |
Ladder leveling system |
Nov. 12, 2002 |
| 6450292 |
Ladder levelling device |
Sep. 17, 2002 |
| 6408984 |
Ladder leveling device |
Jun. 25, 2002 |
| 6401866 |
Machine for leveling a ladder on an uneven surface |
Jun. 11, 2002 |
| 6237718 |
Extendable leg means for levelling ladders and the like |
May. 29, 2001 |
| 6158552 |
Adjustable and locking step stool |
Dec. 12, 2000 |
| 5913382 |
Ladder extension system |
Jun. 22, 1999 |
| 5678656 |
Positive engaging ladder stabilizing and leveling device |
Oct. 21, 1997 |
| 5464071 |
Ladder leveling device |
Nov. 7, 1995 |
| 5341899 |
Anti-skid and leveling device for ladders |
Aug. 30, 1994 |
| 5335754 |
Self-levelling ladder |
Aug. 9, 1994 |
| 4807720 |
Ladder leveling attachment |
Feb. 28, 1989 |
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