DE2522696A1 - Ring spanner with replaceable insert - has split insert carried in cylindrical spanner end and closed on nut under torque - Google Patents

Abstract

The spanner (7) has a ring end (1) and a number of inserts (3) which have the same outside dia. and fit inside the ring end (1). Each insert (3) has a hexagonal hole (4, 14) to suit a particular size nut or bolt. A slot (13) from the hole to the edge provides a degree of flexibility and two flats (5) abut against rollers (6) or balls which are fixed in the inner surface of the ring end (1). When a torque is applied to the spanner (7) one of the rollers (6) is pressed against the adjacent flat (5) causing the surface of the hexagonal hole to be pressed against the flats of the nut and provide a firm grip.

Description

Spannringxschlüssol with exchangeable inserts.

The invention relates to a ring spanner, in which the key is (2) when tightening or loosening on the threaded surfaces (screw head or nut) tense and thus a better contact between the key insert surfaces (4th or 14) and the threaded sub-surfaces.

In addition, the key insert (2) is interchangeable, which means that several Width across flats only one key holder (1) is required.

For loosening, for example, those damaged by corrosion or other influences Threaded parts are often very large loosening torques required, which only then from the wrench can easily be transferred to the thread surface when there is a full surface contact is guaranteed between the wrench surfaces and the threaded surfaces.

With conventional keys, the tolerance between the Width across flats of the threaded part and the width across flats of the tool are only There is partial surface contact, which often leads to deformation of the surfaces leads. There are also changes in the thread surfaces due to improper handling often the cause of thread connections that cannot be loosened with conventional wrenches.

The invention is based on the object of creating a Rin key, the surface pressure between the wrench insert surfaces with increasing tightening or loosening torque (4 or 14) and the thread faces increased to a full one every moment To ensure surface contact.

This object is achieved according to the invention in that in a key holder (1) two pollen (6) are used that span the entire width of the key holder (1) range. A key insert is inserted into the inside of the key holder (1) (2) used, which has an opening (13) and two contact surfaces (5). By twisting of the key holder (1) to the left or right over the lever (7) are the contact surfaces (5) pressed inwards by the olls (6), whereby the wrench insert surfaces (4 or 14) press on the surfaces of the threaded part.

Several key inserts can be used for different wrench sizes 2. Can be used with the same outside diameter for only one key holder. So that the dimension "B" remains as small as possible, around unfavorable screw connections to capture, key inserts (2) with smaller wrench sizes (14) are eccentric worked.

In order to be able to exchange the key inserts (2) and during the Record the work process in the key holder (1), as well as the force from the contact surfaces (5) is to be transferred to the key holder (1) via the key insert (2) in key holder (1j according to Fig. 2 a circumferential groove in which several balls (W) are stored. A retaining strap (9) holds the balls (8) in the circumferential groove.

It is also possible to use the key inserts (2) as shown in FIG a spiral spring (12) which is inserted in the circumferential ring groove of the key holder (1) is to be held and the force of the key insert occurring during the work process (2) to transfer against the key holder (1).

The key inserts (2) can be easily changed through the opening (13) possible, which makes the key insert (2) flexible in the outer diameter.

Claims (9)

Claims 1. Ring spanner with interchangeable inserts, consisting of a key holder (1) which is connected to a lever (7), but thereby characterized in that two rollers (6), balls or spherically shaped parts in the inner surface of the key holder (1) are inserted or put on. 2. Clamping ring wrench as under 1., but characterized that a key insert (2) with differently shaped inner surfaces (4), the wetting are designed for the threaded surfaces to be loosened, in the key holder (1) is inserted. 3. Clamping ring wrench as under 1. and 2., however marked that the differently shaped inner surfaces (4) for key inserts (2) with smaller ones Wrench sizes (14) are incorporated eccentrically into the key insert (2). 4. Clamping ring wrench as under 1. to 3, but characterized that the key insert (2) has a recess (opening) (13). 5. Ring spanner as under 2. to 4., however marked that in the key insert (2) two contact surfaces (5) on the outer diameter (3) of the Recess (13) are attached starting. 6. Clamping ring wrench as under 1., but characterized that the key holder (1) on the inner surface has a circumferential annular groove (Fig. 2 and 3), in which several balls (8) are stored, which are secured by a retaining strap (9) held in place. 7. Clamping ring wrench as under 1. and 6., however characterized that a spiral spring (12) is inserted into the circumferential ring groove of the key holder (1) is (Fig.3). 8. Clamping ring wrench as under 1., 6. and 7th, but characterized by that the spiral spring (12) is supported on the ollen (6) and this is in its position holds. 9. Ring wrench as under 1. and 2., but characterized that the key insert (2) according to Fig. 2 and 3 on the circumference of different depths indentations (10 and 11) through which the insertion and holding of the key insert (2) -in the key holder (1) is made possible. L e r s e i t e