DE2127620A1 - Torque wrench - Google Patents

Description

Dipl.-Ing H .-. Tu: _e v ".i i'ulent.inwcrt f ': ·''' ■ i * '' -Osi -iit '.'tß V T. | _e f "n. {0 * 11) 48 ^ 8; ':

Tonichi Manufacturing Co. Ltd.
No. 16-5, 1-chome, Oomori Nishi, L 9429 / Fl / ho

Ohta-ku, Tokyo (Japan) 3.6.1971

Torque wrench

The invention relates to a torque wrench, with which screws tightened in a known manner under the influence of an optimal torque in the most favorable manner can be.

Basically, the operation of screws can be divided into two stages. In the first stage the nuts or Bolt screwed in or unscrewed so far that the screw rests against the body to be fastened, while in the second stage the nuts or bolts are turned further to a uniformly to obtain secure anchoring of the body to be fastened.

Usually only a small amount of torque is required to turn the nuts or bolts in the first stage; is there the angle of rotation to be passed through is very large, it is about 10 revolutions. On the other hand, in the second stage for the Tightening the screws (nuts or bolts) requires a considerably larger torque compared to the first stage. Furthermore, with regard to the magnitude of the torque, the force that anchors the body to be fastened can differ so that it is necessary to finish the fixing of the body at a certain amount of torque in order to make the body uniform to be able to anchor. Normally, the tightening of the screws is about half a turn at low Rotation angle reached.

209819/0514

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In other words, two different torque characteristics are required for tightening screws. The usual used, conventional torque wrenches are indeed for performing a rotary movement with a constant high torque amplitude at a low angle of rotation are well suited, but they are disadvantageous in the event that nuts or bolts be screwed in with a large number of revolutions at a low torque until it rests on the body to be fastened have to.

The present invention seeks to provide a torque wrench are made available, which enables efficient screwing with an appropriate torque amplitude enables.

According to the invention, this is achieved by one of an energy source actuated drive device for the rotation of a screw tightening ratchet assembly in connection with a hand-operated torque wrench using the same pawl assembly wherein the pawl arrangement in the screwing-in stage at high speed with low output torque from the energy source and in the tightening stage of the screw with a predetermined torque by manually operating the torque wrench is drivable.

The invention is explained in more detail below using the exemplary embodiment shown in FIG. Show it

Fig. 1 is a front view of an embodiment of the rotating door key with a compressed air motor as an energy source " some parts are shown in section;

FIG. 2 shows a sectional illustration through the exemplary embodiment along line A-A in FIG. 1.

Figures 1 and 2 show a torque wrench from the ratchet drive, on whose upper part a compressed air motor 1 with a wing rotor of compact design is provided ,

209819/0514

BATH ORIGINAL

• the one with relatively low drive power via a planetary gear ^! Gearbox 2 reduced and a ratchet wheel 7 automatically set in rotary motion via a clutch 3.

The aforementioned compressed air motor 1 is set in rotation * with the aid of compressed air, which is passed through a valve 5 is fed. The valve 5 is located on the handle 4 of the wrench and is connected to a flexible connecting line 6 provided. The ratchet wheel 7 forms, together with the ι ratchet tooth 8, a ratchet arrangement, so that the The ratchet wheel 7 can only move in one direction of rotation. On the ratchet wheel 7, a drive head 9 is attached, the one Has internal screw head formation 10. Screws 11, the heads of which are inserted into the internal screw head formation 10, are driven in rotation at high speed.

When the screws 11 are applied to the body to be fastened, the amount required for the rotational movement of the screws increases The amplitude of the torque increases sharply, making it impossible to use the output torque that only one of the relative Air motor of compact design emitting little movement power can be removed and the screws can be turned further.

In addition to the above activity levels, the handle 12 is moved by hand in the direction indicated by the arrow, whereby the ratchet 7 by means of the rotation force as in the case, a known Klinkenraddrehmomentschlüssel is set in motion, force the screws 11 aufzu an additional torque.

According to the working methods that are different from the ordinary torque

. ment limiting wrenches are known forth, the '■ Kppfteil 13 is transmitted to the torque acting as an axial force by means of a hinge 14 and a thrust bearing portion 15 to a spring sixteenth As soon as this axial force is greater than the spring force, the housing moves slowly until its inner wall touches the head part 13, which simultaneously with a corresponding

20U8, H / 0bU BAD ORIGINAL

. Movement of the joint 14 is associated. By touching this, it can be easily determined that the predetermined torque is reached.

The torque wrench according to the above-mentioned invention works such that by opening the valve 5 first the screw 11 at high speed with the aid of a compressed air motor is screwed in, e.g. until the head 11 rests on the workpiece to be fastened. Then the screw is used to secure: tightened to the desired rotational position under a predetermined torque.

About particularly effective and economical screwing to enable, the subject matter of the invention is accordingly the driving force of a compressed air motor in connection with manually applied torque used. In addition, it is extremely advantageous that in practice a compressed air motor compact design and light weight can be used because of the low output torque of such a motor is still enough to turn a screw.

The present invention has been described with reference to an embodiment shown in the drawings I, which was equipped with a ¹ air motor. Such an air motor j

can be replaced by any other suitable drive unit. The invention can also be used with other types of torque wrenches, for example with cheek and scale. The air motor can Mt the pawl assembly be connected via a bevel gear, so that the I.

Motor arranged parallel to the course of the key can be. In this case, too, similar effects can be obtained and the amount of the entire execution is reduced.

HirLJick can also refer to an increase in de ·; Aiisdrrlimomentes of the compressed air motor.-? being an impulse mechanism-noticing. Where can the energy sources win ¹ ^ i rj · ■ ■ ■ 1 pv ·· i? - · «

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an electric motor, provided in place of the air motor will.

2 0 Ü B Ί3 / 0514

Claims (1)

PATENT CLAIM Torque wrench, marked by a drive device actuated by an energy source for the rotation of a screw tightening pawl assembly in conjunction with a by hand actuating torque wrench that operates with the same pawl assembly, the pawl assembly in the screwing stage with high speed with a low output torque from the energy source and in the tightening stage the screw with a predetermined torque by manual operation the torque wrench can be driven. BAD ORIGINAU 20Ü819 / 05U Blank page