CA1123799A - Extension trestle ladder - Google Patents

Extension trestle ladder

Info

Publication number
CA1123799A
CA1123799A CA340,074A CA340074A CA1123799A CA 1123799 A CA1123799 A CA 1123799A CA 340074 A CA340074 A CA 340074A CA 1123799 A CA1123799 A CA 1123799A
Authority
CA
Canada
Prior art keywords
fly assembly
rung
arm members
fly
support
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
CA340,074A
Other languages
English (en)
French (fr)
Inventor
Donald L. Shawkey
Kenneth J. Spear
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RD Werner Co Inc
Original Assignee
RD Werner Co Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by RD Werner Co Inc filed Critical RD Werner Co Inc
Application granted granted Critical
Publication of CA1123799A publication Critical patent/CA1123799A/en
Expired legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06C—LADDERS
    • E06C7/00—Component parts, supporting parts, or accessories
    • E06C7/06—Securing devices or hooks for parts of extensible ladders
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06C—LADDERS
    • E06C1/00—Ladders in general
    • E06C1/02—Ladders in general with rigid longitudinal member or members
    • E06C1/04—Ladders for resting against objects, e.g. walls poles, trees
    • E06C1/08—Ladders for resting against objects, e.g. walls poles, trees multi-part
    • E06C1/12—Ladders for resting against objects, e.g. walls poles, trees multi-part extensible, e.g. telescopic
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06C—LADDERS
    • E06C1/00—Ladders in general
    • E06C1/02—Ladders in general with rigid longitudinal member or members
    • E06C1/14—Ladders capable of standing by themselves
    • E06C1/16—Ladders capable of standing by themselves with hinged struts which rest on the ground
    • E06C1/20—Ladders capable of standing by themselves with hinged struts which rest on the ground with supporting struts formed as poles
    • E06C1/22—Ladders capable of standing by themselves with hinged struts which rest on the ground with supporting struts formed as poles with extensible, e.g. telescopic, ladder parts or struts
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06C—LADDERS
    • E06C1/00—Ladders in general
    • E06C1/02—Ladders in general with rigid longitudinal member or members
    • E06C1/38—Special constructions of ladders, e.g. ladders with more or less than two longitudinal members, ladders with movable rungs or other treads, longitudinally-foldable ladders
    • E06C1/39—Ladders having platforms; Ladders changeable into platforms

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ladders (AREA)
CA340,074A 1978-12-11 1979-11-19 Extension trestle ladder Expired CA1123799A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US05/968,210 US4240522A (en) 1978-12-11 1978-12-11 Extension trestle ladder
US968,210 1978-12-11

Publications (1)

Publication Number Publication Date
CA1123799A true CA1123799A (en) 1982-05-18

Family

ID=25513912

Family Applications (1)

Application Number Title Priority Date Filing Date
CA340,074A Expired CA1123799A (en) 1978-12-11 1979-11-19 Extension trestle ladder

Country Status (11)

Country Link
US (1) US4240522A (enExample)
JP (1) JPS5581994A (enExample)
AU (1) AU526911B2 (enExample)
BR (1) BR7907958A (enExample)
CA (1) CA1123799A (enExample)
DE (1) DE2949636A1 (enExample)
ES (1) ES253567Y (enExample)
FR (1) FR2444152A1 (enExample)
GB (1) GB2036845B (enExample)
NL (1) NL7908558A (enExample)
NZ (1) NZ192044A (enExample)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9022043D0 (en) * 1990-10-10 1990-11-21 Daniels Seymour C Stair apparatus
CA2054670C (en) * 1990-11-06 1999-05-25 Gerald O. Hustad Food package having a compartmentalized rigid base tray
US5740575A (en) * 1995-09-29 1998-04-21 Gordon; Julian D. Ramp systems
US5922376A (en) * 1996-01-02 1999-07-13 Privert; Peter Nestable food and beverage package
CA2215873C (en) * 1997-09-10 2003-12-02 J.M. Schneider Inc. Improvements in packages for a food tray
US8992388B2 (en) * 2011-06-10 2015-03-31 Gym-Mark, Inc. Modular ladder frame playground system
US11131103B2 (en) * 2016-03-22 2021-09-28 Werner Co. Assembly, plank adapter for a work stand and method
CN109025781A (zh) * 2018-10-29 2018-12-18 中航鼎衡造船有限公司 一种滑动型人字梯

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US838831A (en) * 1906-01-04 1906-12-18 Daniel W Church Extension step-ladder.
US947810A (en) * 1908-10-27 1910-02-01 Wright L Glidden Extension ladder and trestle.
US1140390A (en) * 1913-04-29 1915-05-25 Fred H Moulton Extension-trestle.
US1965311A (en) * 1933-09-09 1934-07-03 Herman B Gaffers Combined extension ladder and trestle
US2210803A (en) * 1938-08-25 1940-08-06 Stanley E Dunn Extension ladder
US2144440A (en) * 1938-09-16 1939-01-17 Herman B Gaffers Extension ladder trestle
US2947378A (en) * 1959-06-29 1960-08-02 Bergur L Brynjolfsson Extensible trestle
JPS4912354U (enExample) * 1972-05-15 1974-02-01

Also Published As

Publication number Publication date
FR2444152B1 (enExample) 1983-06-17
DE2949636A1 (de) 1980-06-19
AU5364379A (en) 1980-07-10
NZ192044A (en) 1982-05-25
JPS6342069B2 (enExample) 1988-08-19
US4240522A (en) 1980-12-23
AU526911B2 (en) 1983-02-03
GB2036845B (en) 1983-01-06
JPS5581994A (en) 1980-06-20
NL7908558A (nl) 1980-06-13
BR7907958A (pt) 1980-07-08
FR2444152A1 (fr) 1980-07-11
GB2036845A (en) 1980-07-02
ES253567U (es) 1981-06-16
ES253567Y (es) 1981-12-01

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Legal Events

Date Code Title Description
MKEX Expiry