GB969652A - Fork truck with three-part telescoping mast - Google Patents

Fork truck with three-part telescoping mast

Info

Publication number
GB969652A
GB969652A GB4346761A GB4346761A GB969652A GB 969652 A GB969652 A GB 969652A GB 4346761 A GB4346761 A GB 4346761A GB 4346761 A GB4346761 A GB 4346761A GB 969652 A GB969652 A GB 969652A
Authority
GB
United Kingdom
Prior art keywords
section
ram
pulley
rams
raised
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
GB4346761A
Inventor
Robert Sarkis Boyajian
Bernard Bernhardt Becker
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.)
SHEPARD CO LEWIS
Original Assignee
SHEPARD CO LEWIS
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 SHEPARD CO LEWIS filed Critical SHEPARD CO LEWIS
Priority to GB4346761A priority Critical patent/GB969652A/en
Publication of GB969652A publication Critical patent/GB969652A/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
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075—Constructional features or details
    • B66F9/08—Masts; Guides; Chains

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Forklifts And Lifting Vehicles (AREA)

Abstract

969,652. Masted lift trucks. LEWISSHEPARD CO. Dec. 5, 1961, No. 43467/61. Heading B8H. In a fork lift truck provided with a threesection mast 16, 18, 20, the forks 14 are raised on the inner section 20 by a pair of pull rams 24 and chains 40 at a 3: 1 velocity ratio while the section 20 is held fixed, the section 20, together with the fork 14, is then raised by a push ram 30 and the chains 40 at a 2: 1 velocity ratio and at the same time the intermediate suction 18 is raised by cables 68, 76 at half the rate of the section 20. Each chain 40 passes from an anchorage 38 on the piston-rod 28 of ram 24, round a pulley 42 on the cylinder of ram 30, a pulley 36 on piston-rod 28, a pulley 44 on the piston-rod 32 of ram 30, pulleys 46, 48, 50 in section 20 to a lug 52 on the fork 14. The section 20 is locked to the section 18 by a latch, Figs. 11-14 (not shown) which is released when the forks 14 reach the top of the section 20 by a finger on the forks which at the same time open a sequence valve to allow pressure fluid to pass to the ram 30. Extension of the ram 30 then raises the section 20 by means of the chains 40. At the same time the section 18 is raised at half the speed of the section 20 by a cable 68 which is secured at 70 to the section 20 and passes round a pulley 72 at the bottom of section 18 to an anchorage 74 on the fixed section 16. A cable 76, secured to the sections 20, 16 at 78, 82 respectively and passing round a pulley 80 on the section 18, ensures that when the section 20 is lowered, the section 18 will be pulled down at half the speed of the section 20. The effective areas of the pistons of rams 24, 30 are chosen to maintain a constant upward speed of the fork as the ram 30 takes over from the rams 24. The mast section 16 comprises braced channel members 16<SP>1</SP>, 16<SP>11</SP>, Fig. 20, provided at their upper ends with rollers 186, 186<SP>1</SP>, the section 18 comprises I-members 18<SP>1</SP>, 18<SP>11</SP> and is provided with upper and lower rollers 196, 196<SP>1</SP> and 188, 188<SP>1</SP> respectively, and the section 20 comprises I-members 20<SP>1</SP>, 20<SP>11</SP> provided with at their lower ends with rollers 198, 198<SP>1</SP>. The section 16 is pivoted to the truck and is tilted by rams 172.
GB4346761A 1961-12-05 1961-12-05 Fork truck with three-part telescoping mast Expired GB969652A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4346761A GB969652A (en) 1961-12-05 1961-12-05 Fork truck with three-part telescoping mast

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4346761A GB969652A (en) 1961-12-05 1961-12-05 Fork truck with three-part telescoping mast

Publications (1)

Publication Number Publication Date
GB969652A true GB969652A (en) 1964-09-16

Family

ID=10428874

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4346761A Expired GB969652A (en) 1961-12-05 1961-12-05 Fork truck with three-part telescoping mast

Country Status (1)

Country Link
GB (1) GB969652A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4449614A (en) * 1980-11-28 1984-05-22 Nissan Motor Company, Limited Lift device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4449614A (en) * 1980-11-28 1984-05-22 Nissan Motor Company, Limited Lift device

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