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Hydraulic tensioning tool

  • US 4,598,897 A
  • Filed: 02/11/1985
  • Issued: 07/08/1986
  • Est. Priority Date: 02/16/1984
  • Status: Expired due to Fees
First Claim
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1. An hydraulic tensioning tool for tensioning reinforcing cables, rods and like devices (13) in concrete structures, comprising:

  • a first working piston-cylinder device (21) including a cylinder (23) and a tensioning piston (24); and

    a cable holder (14) for creating tension; and

    a second working piston-cylinder device (12) including a locking cylinder (27) and a locking piston (26); and

    a cable lock (12) for anchoring the cable subsequent to creating tension therein;

    a cylinder housing (11) in which both of said piston-cylinder devices (21,12) are housed, said cylinder housing (11) being common to both of said piston-cylinder devices;

    said piston (24,26) of said first and second piston-cylinder devices being movable in mutually opposite directions during their respective working strokes;

    said tensioning piston (24) having a free end (25) projecting from said cylinder housing, and said cable holder (14) being mounted on said free projecting end (25); and

    an electromechanical position indicator (16) arranged between said cylinder housing (11) and said cable holder (14);

    said position indicator (16) including a coil assembly (17) for generating a magnetic flux, and a core (18) arranged for insertion into said coil assembly so as to influence the magnetic flux in relation to the relative movement between said cylinder housing (11) and said cable holder (14);

    said cable holder (14) including an outer sleeve (40) having movable tensioning jaws (41) mounted therein; and

    said outer sleeve (40) including a readily removable backpiece (44).

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