GB821075A - Improvements in and relating to screw jacks - Google Patents

Improvements in and relating to screw jacks

Info

Publication number
GB821075A
GB821075A GB411357A GB411357A GB821075A GB 821075 A GB821075 A GB 821075A GB 411357 A GB411357 A GB 411357A GB 411357 A GB411357 A GB 411357A GB 821075 A GB821075 A GB 821075A
Authority
GB
United Kingdom
Prior art keywords
wire
jack
jaws
nut
rod
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
GB411357A
Inventor
Albert Godenir
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.)
SPEEDACC Co Ltd
Original Assignee
SPEEDACC Co 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 SPEEDACC Co Ltd filed Critical SPEEDACC Co Ltd
Priority to GB411357A priority Critical patent/GB821075A/en
Publication of GB821075A publication Critical patent/GB821075A/en
Expired legal-status Critical Current

Links

Classifications

    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/12Mounting of reinforcing inserts; Prestressing
    • E04G21/121Construction of stressing jacks

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Wire Processing (AREA)

Abstract

821,075. Tensioning wires. SPEEDACC CO. Ltd. Jan. 15, 1958 [Feb. 6, 1957], No. 4113/57. Class 45. [Also in Group X] A wire tensioning screw jack having a wire grip has means for indicating the wire tension ; the means being actuated by the deformation of a part of the jack subjected to the tension applied to the wire. The jack comprises a ram 3 engaged by a nut 2 rotatably mounted on the jack body 4. The grip comprises jaws 11 sliding within inclined bores in a member 10 carried by a rod 5, the jaws being biassed to the closed position by a spring 12. The rod 5 is the part subjected to the tension applied to the wire, and carries at the upper end a casing 8 containing the tension indicator 9 which is connected by means of a rod 7 to the lower end of the rod 5. Before tensioning a reinforcement wire 14, extending through concrete 21, a thrust plate 15, a gripper sleeve 17, a pressure tube 18 and a disc 19 are arranged about the wire. The jack carrying an axially movable heavy ring 13 is then positioned above the wire with the wire engaged between the jaws 11. The nut is rotated to raise the ram which engages the casing 8 to lift rod 5 to cause the jaws to grip the wire which is then tensioned by further rotation of the nut. The pressure exerted by the jack and tube on the gripper sleeve during tensioning of this wire causes the gripper sleeve to grip the wire. When the required wire tension is reached the nut rotation is stopped and the disc 19 is struck by the ring 13 to thrust the gripper sleeve into further gripping engagement with the wire. The rotation of the nut is reversed to free the jaws, the jack, pressure tube and disc are removed from the wire, the free end of the wire is cutoff, and the end of the wire is burred over the upper end of the sleeve.
GB411357A 1957-02-06 1957-02-06 Improvements in and relating to screw jacks Expired GB821075A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB411357A GB821075A (en) 1957-02-06 1957-02-06 Improvements in and relating to screw jacks

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB411357A GB821075A (en) 1957-02-06 1957-02-06 Improvements in and relating to screw jacks

Publications (1)

Publication Number Publication Date
GB821075A true GB821075A (en) 1959-09-30

Family

ID=9771017

Family Applications (1)

Application Number Title Priority Date Filing Date
GB411357A Expired GB821075A (en) 1957-02-06 1957-02-06 Improvements in and relating to screw jacks

Country Status (1)

Country Link
GB (1) GB821075A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3151842A (en) * 1963-07-05 1964-10-06 Technion Res & Dev Foundation Wire tensioning device
EP0491081A1 (en) * 1990-12-19 1992-06-24 Shimadzu Corporation Wedge type grip
CN117449608A (en) * 2023-12-26 2024-01-26 福建理工大学 A self-leveling carbon fiber board prestressing force tensioning equipment for cambered surface structure

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3151842A (en) * 1963-07-05 1964-10-06 Technion Res & Dev Foundation Wire tensioning device
EP0491081A1 (en) * 1990-12-19 1992-06-24 Shimadzu Corporation Wedge type grip
US5127696A (en) * 1990-12-19 1992-07-07 Shimadzu Corporation Wedge type grip
CN117449608A (en) * 2023-12-26 2024-01-26 福建理工大学 A self-leveling carbon fiber board prestressing force tensioning equipment for cambered surface structure
CN117449608B (en) * 2023-12-26 2024-03-12 福建理工大学 A self-leveling carbon fiber board prestressing force tensioning equipment for cambered surface structure

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