GB242139A - Improvements in or relating to lifting jacks - Google Patents

Improvements in or relating to lifting jacks

Info

Publication number
GB242139A
GB242139A GB571125A GB571125A GB242139A GB 242139 A GB242139 A GB 242139A GB 571125 A GB571125 A GB 571125A GB 571125 A GB571125 A GB 571125A GB 242139 A GB242139 A GB 242139A
Authority
GB
United Kingdom
Prior art keywords
pawl
sleeve
lever
pivot
pillar
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
GB571125A
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.)
Lake and Elliot Ltd
Original Assignee
Lake and Elliot Ltd
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 Lake and Elliot Ltd filed Critical Lake and Elliot Ltd
Priority to GB571125A priority Critical patent/GB242139A/en
Publication of GB242139A publication Critical patent/GB242139A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F1/00—Devices, e.g. jacks, for lifting loads in predetermined steps
    • B66F1/02—Devices, e.g. jacks, for lifting loads in predetermined steps with locking elements, e.g. washers, co-operating with posts
    • B66F1/04—Devices, e.g. jacks, for lifting loads in predetermined steps with locking elements, e.g. washers, co-operating with posts the posts being toothed
    • B66F1/06—Devices, e.g. jacks, for lifting loads in predetermined steps with locking elements, e.g. washers, co-operating with posts the posts being toothed and the devices being actuated mechanically

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)

Abstract

242,139. Barrett, H. R., and Lake & Elliot, Ltd. March 2, 1925. Jacks. - A lifting-jack of the kind having a variable fulcrum giving a high lift has a central extension in the form of pivoted legs adapted to support the load while the second fulcrum is brought into operation. The crutch 10 is connected by a parallel motion linkage 11 to a sleeve 4 slidably mounted on a pillar 2 on the base 1, the lower members 8 of the linkage being mounted on a pivot 6 in the sleeve and being formed as extensions of the operating lever 7. The sleeve carries a weighted pawl 21 adapted to engage teeth 22 on the pillar and the pivot 9 of the linkage carries a pawl 19 controlled by a lever 25 and adapted to engage teeth 5 on the sleeve. The pivot 9 also carries a pair of supporting legs 34 controlled by a lever 32. In operation, the lever 7 is moved downwards until the pawl 19 engages the top ratchet tooth 5. The trigger 36 is then released to free the catch 37 from the sleeve 31, pivoted to the lever 32, which operates the supporting legs 34, so that the legs swing down into the vertical position and rest in recesses 39, Fig. 5, in the base so as to support the load when the pawl 19 is released from the tooth 5 by manipulating t'he handle and trigger device 26. The lever 7 now fulcrums on the pivot 9 and is raised until the pawl 21 on the sleeve 4 engages one of the teeth 22 on the pillar as shown in Fig. 5. The handle now fulcrums. on the pivot 6 and a further lift is effected by raising the crutch until the pawl 19 engages the ratchet teeth 5. To lower the load the sequence of operations is reversed.
GB571125A 1925-03-02 1925-03-02 Improvements in or relating to lifting jacks Expired GB242139A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB571125A GB242139A (en) 1925-03-02 1925-03-02 Improvements in or relating to lifting jacks

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB571125A GB242139A (en) 1925-03-02 1925-03-02 Improvements in or relating to lifting jacks

Publications (1)

Publication Number Publication Date
GB242139A true GB242139A (en) 1925-11-05

Family

ID=9801190

Family Applications (1)

Application Number Title Priority Date Filing Date
GB571125A Expired GB242139A (en) 1925-03-02 1925-03-02 Improvements in or relating to lifting jacks

Country Status (1)

Country Link
GB (1) GB242139A (en)

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