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US5538379: Mechanical tensioner for and method of elongating and relaxing a stud and the like

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Filing Information

Inventor(s) John K. Junkers ·
Assignee(s) JUNKERS JOHN K ·
Attorney/Agent(s) Michael J. Striker ·
Primary Examiner Neill R. Wilson ·
Application Number US8388746
Filing date 02/15/1995
Issue date 07/23/1996
Predicted expiration date 02/15/2015
U.S. Classifications 411/432  · 411/403  ·
International Classifications F16B 3708  ·
Kind CodeA
International Classifications 411427;428;432;402;403;916;917 ·
10 Claims, No Drawings


Abstract

A mechanical tensioner for elongating and relaxing a stud having an axis and arranged in an object, comprises at least two parts including a first part connectable with a stud to pull the stud in an axial direction so as to elongate the stud and thereby to tension it in an object or to relax the stud, a second part connected with the first part movably in a transverse direction relative to the first part, and a friction element arranged between the first part and the second part and connected with the first part immovably in a transverse direction relative to the first part. The second part has a first engaging element engageable by a tool, while the friction element has a second engaging element engageable by a tool so that when an active force is applied to the second part through the first engaging element and an opposite holding force is applied to the friction element through the second engaging element the second part moves in a transverse direction and the first part moves only in an axial direction so as to elongate or to relax the stud.

Independent Claims | See all claims (10)

  1. 1. A mechanical tensioner for elongating and relaxing a stud having an axis and arranged in an object, comprising at least two parts including a first part connectable with a stud to pull the stud in an axial direction so as to elongate the stud and thereby to tension it in an object or to relax the stud; a second part connected with said first part movably in a transverse direction relative to said first part; and a friction element cooperating with said first part and said second part and connected with said first part immovably in a transverse direction relative to said first part, said second part having first engaging means engageable by a tool, while said friction element has second engaging means engageable by a tool so that when an active force is applied to said second part through said first engaging means and an opposite holding force is applied to said friction element through said second engaging means said second part moves in the transverse direction relative to said first part and said first part moves only in an axial direction relative to said second part so as to elongate or to relax the stud.
  2. 6. A method of elongating and relaxing a stud having an axis and arranged in an object, comprising the steps of connecting a first part with the stud to pull the stud in an axial direction so as to elongate the stud and thereby to tension it in the object and to relax the stud; connecting a second part with the first part so that the second part is movable in a transverse direction relative to the first part; arranging a friction element between the first part and the second part; providing on the second part first engaging means engageable by a tool; providing on the friction element second engaging means engageable by a tool; applying an active force to the second part through the first engaging means, and applying an opposite holding force to the friction element through the second engaging means so that the second part moves in the transverse direction while the first part moves only in an axial direction so as to elongate or to relax the stud.

References Cited

U.S. Patent Documents

Document NumberAssigneesInventorsIssue/Pub Date
US5137408 Junkers Aug 1992
US5152649 Hilti Aktiengesellschaft Popp Oct 1992
US5253967 Biach Industries Orban et al. Oct 1993
US5318397 Junkers Jun 1994
US5341560 Junkers Aug 1994

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