Adjustable extension stepladder

• US 5,590,739 A
• Filed: 11/01/1994
• Issued: 01/07/1997
• Est. Priority Date: 11/01/1994
• Status: Expired due to Fees

• Current Assignee: Timm J. Timmermann
• Original Assignee: High, DeWayne A., Timm J. Timmermann
• Inventors: Timmermann, Timm J., High, DeWayne A.
• Primary Examiner(s): CHIN SHUE, ALVIN C
• Application Number:
  US08/301,636
• Time in Patent Office: 798 Days
• Field of Search: 182/169, 182/174, 182/172, 182/165, 182/208, 182/211, 182/170, 182/22, 182/26, 182/180
• US Class Current: 182/169
• CPC Class Codes: E06C 1/12 extensible, e.g. telescopic
• CPC Class Codes: E06C 1/22 with extensible, e.g. telescopic, ladder parts or struts
• CPC Class Codes: E06C 1/393 Ladders having platforms foldable with the ladder
• CPC Class Codes: E06C 1/397 characterised by having wheels, rollers, or runners
• CPC Class Codes: E06C 7/06 Securing devices or hooks for parts of extensible ladders
• CPC Class Codes: E06C 7/423 Ladder stabilising struts
• CPC Class Codes: E06C 7/44 Means for mounting ladders on uneven ground

Abstract

A motorized utility extension ladder having a main and upper riser section extendable by a motor. The ladder further comprising a telescopic prop so that the ladder may be free standing, side wing legs for stabilizing the ladder, wheels for transporting the ladder, and a removable shelf.

Claims

1. A motorized utility ladder comprising a main riser section and an upper riser section, means for raising and lowering the upper section relative to the main section comprising a motor, battery housing with up and down switch, and a sprocket attached to the main section and a strip gear attached to the upper section, said ladder further comprising a telescopic tripod leg having a foot pad, a quick release adjusting pin with a safety chain, a stop collar, the top of the tripod leg having a bracket comprising a sliding collar slidably attached to the tripod leg, connecting rods and collars for attachment to a top rung of the upper section, an adjustable horizontal telescopic arm having a collar at one end attached to the tripod leg, and a bracket with a sliding collar, connecting rods and collars attached to a lower rung of the upper section, a utility shelf pivotally attached to the top of the upper section by quick release pins to enable removal of the shelf from the ladder, a pair of side wing legs hinged to the bottom of the main section, said wing legs comprising a telescopic members forming a bottom telescopic rung for the main section, said ladder having a pair of transport wheels attached to the lower end of the main section by support brackets, a pair of spring assisted pivot locks with spring assisted front clips attached to a lower portion of the upper section for locking the upper and main section at selected extensions.