GB746283A - Improvements in or relating to extension ladders - Google Patents

Improvements in or relating to extension ladders

Info

Publication number
GB746283A
GB746283A GB13308/53A GB1330853A GB746283A GB 746283 A GB746283 A GB 746283A GB 13308/53 A GB13308/53 A GB 13308/53A GB 1330853 A GB1330853 A GB 1330853A GB 746283 A GB746283 A GB 746283A
Authority
GB
United Kingdom
Prior art keywords
ladder
hinged
pivoted
members
spindle
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
GB13308/53A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB13307/53A priority Critical patent/GB746282A/en
Priority to GB13308/53A priority patent/GB746283A/en
Publication of GB746283A publication Critical patent/GB746283A/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
    • E06C7/16—Platforms on, or for use on, ladders, e.g. liftable or lowerable platforms
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06C—LADDERS
    • E06C5/00—Ladders characterised by being mounted on undercarriages or vehicles Securing ladders on vehicles
    • E06C5/02—Ladders characterised by being mounted on undercarriages or vehicles Securing ladders on vehicles with rigid longitudinal members
    • E06C5/04—Ladders characterised by being mounted on undercarriages or vehicles Securing ladders on vehicles with rigid longitudinal members capable of being elevated or extended ; Fastening means during transport, e.g. mechanical, hydraulic
    • E06C5/16—Ladders characterised by being mounted on undercarriages or vehicles Securing ladders on vehicles with rigid longitudinal members capable of being elevated or extended ; Fastening means during transport, e.g. mechanical, hydraulic using mechanical transmission only, with or without fluid or other non-mechanical couplings or clutches

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ladders (AREA)
  • Braking Arrangements (AREA)

Abstract

746,283. Ladders. MATTHEWS, C. H. July 14, 1954 [May 13, 1953], No. 13308/53. Class 20(2). An extension ladder elevator comprises a pair of hinged parallelogrammatic members pivoted at their lower corners to a fixed part and at the opposite corners to the ladder, the rear end of the ladder being pivoted to a fixed part and means being provided to move the members about their hinges to alter their shape and thus raise or lower the ladder. As shown the ladder 6, which according to the Provisional Specification may be as described in Specification 593,874, is mounted on a turntable 5 as described in Specification 746,282, by pivoting thereto its rear end, and the lower corners of the hinged members such as 3, at 9 and 3a respectively. The hinged member 3 is operated by a double threaded spindle 11 screwed into its pivots 13 and having a chain wheel 17 at its centre ; a frame 23 is supported by the spindle 11 and the corresponding spindle of the other hinged member arranged at the other side of the turntable, and carries chain reduction gearing coupling a hand wheel 28 to both double threaded spindles. A stand or cradle 30 is pivoted to the upper end of the ladder and may be locked in adjusted position by wing nuts 33 engaging quadrants 32.
GB13308/53A 1953-05-13 1953-05-13 Improvements in or relating to extension ladders Expired GB746283A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB13307/53A GB746282A (en) 1953-05-13 1953-05-13 Improvements in or relating to extension ladders
GB13308/53A GB746283A (en) 1953-05-13 1953-05-13 Improvements in or relating to extension ladders

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB13307/53A GB746282A (en) 1953-05-13 1953-05-13 Improvements in or relating to extension ladders
GB13308/53A GB746283A (en) 1953-05-13 1953-05-13 Improvements in or relating to extension ladders

Publications (1)

Publication Number Publication Date
GB746283A true GB746283A (en) 1956-03-14

Family

ID=34740760

Family Applications (2)

Application Number Title Priority Date Filing Date
GB13308/53A Expired GB746283A (en) 1953-05-13 1953-05-13 Improvements in or relating to extension ladders
GB13307/53A Expired GB746282A (en) 1953-05-13 1953-05-13 Improvements in or relating to extension ladders

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB13307/53A Expired GB746282A (en) 1953-05-13 1953-05-13 Improvements in or relating to extension ladders

Country Status (1)

Country Link
GB (2) GB746283A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3043394A (en) * 1960-02-03 1962-07-10 Mccabepowers Body Company Boom attachments
US3095061A (en) * 1960-07-15 1963-06-25 Louie E Gregory Hydraulically operated lazy tongs structure
US3196979A (en) * 1961-08-22 1965-07-27 Eaton Metal Products Company Workman's cage or aerial basket
US3830336A (en) * 1973-08-22 1974-08-20 Chance Co Personnel bucket brake for hydraulic cranes

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4185716A (en) * 1977-05-12 1980-01-29 Ladder Towers, Inc. Self closing gate

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3043394A (en) * 1960-02-03 1962-07-10 Mccabepowers Body Company Boom attachments
US3095061A (en) * 1960-07-15 1963-06-25 Louie E Gregory Hydraulically operated lazy tongs structure
US3196979A (en) * 1961-08-22 1965-07-27 Eaton Metal Products Company Workman's cage or aerial basket
US3830336A (en) * 1973-08-22 1974-08-20 Chance Co Personnel bucket brake for hydraulic cranes

Also Published As

Publication number Publication date
GB746282A (en) 1956-03-14

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