DE102009042012A1 - Screw wrench for releasing fixed nut- or screw connection in e.g. ship building, has cable limited at end of drum, where torque amplification is effected by different radius ratio of bolt to larger diameter of cable receiving drum - Google Patents

Abstract

The wrench has a handle (1) connected with an integrated eccentric bolt (3) on a drive joint (2) that is pivotable with in a housing. A cable (4) suspended in the eccentric bolt is rolled in multiple coils over a cable receiving- and push through part drum (6), by a partial circle movement of the handle and the joint. The cable is limited, tightened and clamped at an end of the drum by a cable tightener with a spring (8), where a torque amplification is effected by different radius ratio of the eccentric bolt to the larger diameter of the drum.

Description

It is known that there are wrenches of multiple and simple conventional type. It is also known that there are wrenches with advanced ratchet technology in a variety of designs and sizes. It is also known that there are high-quality force multipliers, which are used for solving extremely heavy screw joints.

To overcome difficult to solve screw in remote areas, there is still no suitable wrench with torque gain, which can be so economically produced because of its simple technology, but robust and with a torque gain, so that it in many tool boxes and pockets in steel and Mechanical engineering, in the truck long-distance traffic as well as in the shipbuilding and the shipping, etc. would be to be found.

The invention is based on the object, due to their relatively simple mechanics, can be dispensed with costly production techniques, which without costly ratchet technology a wrench with efficient torque gain 1 ( 2 . 3 . 6 ) on the basis of a cable drive ( 4 ) is produced. The handle ( 1 ) is after a pitch circle rotation as in a conventional ratchet, freely pivoting or turning back and then, as in a conventional ratchet wrench, ready for further loosening a screw connection.

The possibility of freely rotatable drive on the Seilaufnahme- and Durchsteckteil-drum ( 6 ) is made possible in the form by tightening the preferably made of steel drive cable from both sides at the same time. 3 ( 3 . 8th ) On the drive side by handle ( 1 ), Drive joint ( 2 ), Eccentric bolts ( 3 ) over the rope ( 4 ) and on the opposite side (end), is connected to a compression or tension spring. Thus, both side ends are pulled simultaneously and on the Seilaufnahme- and push-through drum ( 6 ) immediately upon actuation of the handle by the bilateral tension 3 totally lashed. The totally solid connection drives so when the pressure on the handle ( 1 ), Drive joint ( 2 ), Eccentric bolts ( 3 ) the cable receiving and piercing drum ( 6 ) and is effective on the screw to be solved, while the tension or compression spring 1 - 4 ( 8th ), depending on how the springs are incorporated, the rope is held tight or tension.

At the same time, due to the different radii, once the pitch circle of the eccentric pin ( 3 ) and the larger diameter of the Seilaufnahme- and push-through drum ( 6 ) conditionally, a corresponding reduction, ie torque amplification effective. From the moment the user releases the pressure from the handle ( 1 ) takes the rope tightener 2 with compression or tension spring ( 8th ) relaxed 2 ( 3 . 8th ) and the rope ( 4 ) loosely when returning the handle on the Seilaufnahme- and Durchsteckteil drum (also square driver 2 ( 6 ), which is not moved and only then taken back, as soon as the user again the pressure on the handle ( 1 ) 3 exercise and from the moment again the tension on the rope ( 4 ) is produced at both ends of the rope and the Seilaufnahme- and push-through drum ( 6 ) with the lashed rope ( 4 ) over the complete rope winding 3 and 4 is tightly spanned.

LIST OF REFERENCE NUMBERS

1

handle

2

Drive joint for eccentric mount

3

Eccentric bolt (concealed) for cable pull receiver

4

rope

5

Axle for drive joint

6

Rope pick-up and push-through drum (replaces conventional ratchet ring)

7

Stop limit in the housing for drive joint

7a

Stop limit in the housing for drive joint

8th

Rope tightener with compression spring (partly hidden)

8a

Marking for fine adjustment of the cable tensioner

9

casing

9a

housing connector

Claims (3)

Wrench with cable torque converter provided for releasing excessively tight nut or screw, characterized in that in a pivot or pitch circle movement of a handle, which is connected to a pivotable within a housing drive joint with an integrated eccentric pin so that by the pitch circle movement of the handle and so with the pivotable drive joint, a suspended in the eccentric pin rope is rolled over a Seilaufnahme- and push-through drum in several turns and at its opposite end by a rope tightener with spring, also caused by the pitch circle movement of the handle, tightened and in the episode the Seilaufnahme- and push-through drum is lashed directly and by the different radii ratio of the eccentric pin to the larger diameter of Rope receiving through-hole drum torque gain is effective. Seilzugdrehkraftverstärkerschlüssel according to claim 1, characterized in that when turning back the handle of the rope tightening loses its effect and the lashed rope is released immediately and on the Seilaufnahme- and push-through drum, without moving them, sanding back and then another pitch circle movement of the handle another Operation on the screw connection to be solved, then continued again with automatically lashed rope. Seilzugdrehkraftverstärkerschlüssel, according to claims 1 to 2, characterized in that the cable tensioner equipped with a tension or compression spring is adjustable in its tensile or compressive strength.

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