Donald L Shawkey

US Patent:

42405220, Dec 23, 1980

Filed:

Dec 11, 1978

Appl. No.:

5/968210

Inventors:

Kenneth J. Spear - Sharon PA
Donald L. Shawkey - Sandy Lake PA

Assignee:

R. D. Werner Co., Inc. - Greenville PA

International Classification:

E04G 130
E06C 118

US Classification:

182105

Abstract:

A device for automatically locking the fly assembly of an extension trestle ladder in an extended or lowered adjustment position. The fly assembly is supported to prevent downward movement by a displaceable member which abuts a rung on the fly assembly along a portion of the length of the rung, which member is spring biased for automatic return to locking position.