Convertible chair ladder

Description

FIG. 1 is a front perspective view of a convertible chair ladder, in chair mode, showing our new design;

FIG. 2 is a front elevation thereof;

FIG. 3 is a rear elevation thereof;

FIG. 4 is an elevation of one side thereof, the opposite side elevation being a mirror image;

FIG. 5 is a top plan thereof;

FIG. 6 is a bottom plan thereof;

FIG. 7 is a front perspective view thereof in ladder mode;

FIG. 8 is a front elevation thereof;

FIG. 9 is an elevation of one side thereof, the opposite side being a mirror image;

FIG. 10 is a rear elevation thereof;

FIG. 11 is a top plan thereof; and,

FIG. 12 is a bottom plan thereof.

Referenced Cited
U.S. Patent Documents
D23739 October 1894 Herhold
D111670 October 1938 Sunquist et al.
D153488 April 1949 Balavny
D161792 January 1951 Schilling
D353720 December 27, 1994 Ward
371128 October 1887 Dudley
910818 January 1909 Hook
2291996 August 1942 Tucker
Foreign Patent Documents
513850 November 1920 FRX
Other references
  • Hasluck Woodworking, .COPYRGT.1907, pp. 525 & 526, Chair at bottom right and chair at top left, respectively. Popular Mechanics, Feb. 1952, p. 205, chair in center of page.
Patent History
Patent number: D369684
Type: Grant
Filed: Jul 17, 1995
Date of Patent: May 14, 1996
Inventors: John J. Engel (Ripon, CA), Robert W. Kammerer (Wilton, CA)
Primary Examiner: Gary D. Watson
Law Firm: Lothrop & West
Application Number: 0/41,481
Classifications
Current U.S. Class: D/6335