DE10255682A1 - Device for manually turning, tightening and loosening fasteners with an external and / or internal attack - Google Patents

Abstract

In a device (1) for manually turning, tightening and loosening fasteners with an external and / or an internal attack, a screw-in part (2) and a handle (3) are provided, between which a torque limiting device (4) is inserted in order to If a predetermined torque is exceeded, the further rotary movement of the handle (4) relative to the screw-in part (2) is released. The torque limiting device (4) is formed by a spring (5) arranged in the handle (3) and a ball (6) acted upon by the spring (5). The screw-in part (2) has an indentation (7) which extends in the axial direction and into which the ball (6) engages. The indentation (7) is provided with flat boundary surfaces (8, 9) in the region of the contact of the ball (6), the boundary surface (9) lying at the front in the direction of insertion (11) with the screw-in part ( 2) and the spring (5) imaginary central plane (12) encloses a larger acute angle (alpha) than the boundary surface (9) located at the rear in the direction of rotation (11).

Description

The invention relates to a device for manual operation Screw in, tighten and loosen Fasteners with an external and / or internal attack, consisting of a screw-in part and a handle, between which a torque limiting device is used to when exceeded a predetermined torque, the further rotational movement of the handle release.

In a known device of the type mentioned at the beginning ( U.S. Patent 2,503,499 ) a square is formed to limit the torque at the end of the screw-in part inserted into a handle, a spring-loaded bolt being supported on one surface of this square. When a corresponding torque is reached, the bolt is raised and the screw-in part can turn relative to the handle. In this way, however, only a relatively small torque can be set. In order to be able to tighten screws appropriately, for example when fastening tool parts, such a pure installation of parts is not sufficient. In addition, only the same tripping torque can always be set in both the screwing-in direction and in the release direction.

In another known device ( EP-A-0 925 878 ) there is only a spring-loaded contact of a dome-shaped part on one of the flat surfaces of a square at one end of the screw-in part. Even if the spring is preloaded no matter how strong, sufficient torque cannot be achieved to properly tighten, for example, screws in machine and tool construction.

The invention has therefore become Task set a device of the type mentioned above to improve that a high insertion torque is achieved despite manual operation can be.

This is achieved according to the invention in that the Torque limiting device arranged in the handle Spring and an acted upon by the spring Ku gel is formed and the screw-in part at least one extending in the axial direction Has indentation in which the ball engages, and that the Indentation at least in the area of the ball contact with planes boundary surfaces is provided, the boundary surface lying at the front in the direction of rotation with the median plane conceived by the handle, the screw-in part and the spring a bigger point Includes angle than the boundary surface at the back in the direction of rotation.

These measures ensure that the Fasteners can be tightened with a high torque because far higher personnel have to be spent to force the ball out of the indentation in the radial direction as this when sliding on a flat surface with a square Case is. It is precisely in this way that the magnitude of the torques has become possible when screwing in and loosening to have a fastener of different sizes. With a device according to the invention it is possible become the necessary Power also for loosening a fastener to apply without the torque limiting device comes into effect. But this is precisely the case with fasteners, the possibly turned in several times and also to be solved again, of crucial Advantage.

An advantageous embodiment is that the boundary surface at the front in the direction of rotation with the one meant by the handle, the screw-in part and the spring Middle plane includes an acute angle between 15 ° and 45 °, preferably 30 °. It is a possibility in the direction of rotation created despite the high for transmission potential Torque to cause a good torque limitation.

To create a safe way, the fasteners to solve again it is therefore proposed that the one lying in the back in the direction of rotation boundary surface with the median plane conceived by the handle, the screw-in part and the spring an angle between 0 ° and 30 °, preferably of 15 °. It requires therefore when turning in the loosening direction of a far higher one Exertion of force to trigger the torque limiting device.

A particularly beneficial and effective complement arises when the transitions between the boundary surfaces the indentation and the outer circumference of the Screw-in part rounded off are. It is therefore after a corresponding torque-related lifting the ball a quick and more or less disabling release has become possible. Furthermore, there is practically no wear and tear on the ball and at the transition given.

It is therefore proposed that the transition between the front surface of the Indentation and the outer circumference of the screw-in part has a radius of 0.3 to 0.7 mm, preferably of 0.5 mm. It is therefore in the direction of rotation after reaching the preset torque no problem with a quick release of the There is a connection between the handle and the screw-in part.

In this regard, too, the effect of the torque limiting device in the loosening direction for fastening means can be intensified, namely by making this transition more angular than is the case in the transition in the direction of rotation. It is therefore proposed here that the transition between the rear in the direction of rotation boundary surface of the indentation and the outer circumference of the screw-in part has a radius of 0.2 to 0.6 mm, preferably 0.4 mm.

Constructively needed it for proper power transmission even with a manually operated Providing a precise solution that is ideal for many setting and loosening processes. A A special design is therefore seen when the ball is guided in a displacement sleeve in its displacement area in the axial direction of the spring.

Especially with such a hand tool is also the mounting option really important. It is therefore to be considered advantageous that the Bullet, the fitting sleeve and the spring in a hole in the handle open to one side are used.

Result from the configuration according to the invention other options and here in particular in the construction of the handle itself. Even when screwing in, tightening and loosening not easily accessible Fasteners prove to be advantageous if the handle from an essentially radially freely cantilevered to one side wing is formed. As a result, accessibility is hardly possible accessible places have been facilitated. For use in all areas is such a handle with a protruding only on one side wing easy to handle.

When training the device with a wing projecting only on one side is advantageously provided, that the hole from that of the wing section of the handle facing away, that is from one of the inserted Screw-in part facing away from the wing Section of the handle. It is therefore also a simple one Assembly of the device ensured.

So that the fully assembled device also for many operations for screwing in, tightening and loosening can be used without interfering with external manipulations has been suggested that the open end of the bore in the wing facing away portion of the handle by means of a cap or a Plug is closed.

The device according to the invention is intended for a large number can be equipped with similar drives. It it is conceivable to use a wide variety of bits with an outside and / or an internal attack. In this context, it is advantageous if the screw-in part has a receiving opening at its freely projecting end positive and / or non-positive Holder for a drive for Fastening means having an external or internal attack.

Further measures according to the invention and Advantages will appear in the description below with reference to the drawing even closer explained. Show it:

1 a longitudinal section through a device according to the invention;

2 a section along the line II-II in 1 ;

3 an oblique view of a device according to the invention, a possible original size is shown here.

With a device according to the invention 1 a simple and effective way to enable manual turning, tightening and loosening of fasteners with an external and / or internal attack. This device 1 consists essentially of a screw-in part 2 and a handle 3 , Between the screw-in part 2 and the handle 3 is a torque limiting device 4 used to the further rotary movement of the handle when a predetermined torque is exceeded 3 release. The torque limiting device 4 is in the handle of one 3 arranged spring 5 and one from the pen 5 loaded ball 6 formed, the screw-in part 2 at least one indentation extending in the axial direction 7 in which the ball 6 intervenes. Only a single indentation is advantageous 7 provided that then a locking position between the handle 3 and screw-in part 2 given is. After releasing the lock as a result of reaching the torque, the handle can 3 then be turned through 360 ° until the lock engages again. So there is always a very clear release and re-engagement. Within the scope of the invention, two or more such indentations can of course also be provided running parallel to one another, but this only makes the exact design and effectiveness more difficult.

The dent 7 is at least in the area of the lateral contact of the ball 6 with flat boundary surfaces 8th and 9 Mistake. A lower boundary surface 10 can also be made flat or curved in cross section. The in the direction of rotation 11 front boundary surface 8th closes with the by the handle 3 , the screw-in part 2 and the feather 5 imaginary middle plane 12 a larger acute angle α than that in the direction of insertion 11 rear boundary surface 9 , It is advantageously provided that the direction of rotation 11 front boundary surface 8th with that through the handle 3 , the screw-in part 2 and the feather 5 imaginary middle plane 12 includes an acute angle α between 15 ° and 45 °, preferably 30 °. The in the direction of rotation 11 rear boundary surface 9 closes with the imaginary middle plane 12 a win kel β between 0 ° and 30 °, preferably from 15 °.

The transitions 13 and 14 between the boundary surfaces 8th and 9 the indentation 7 and the outer circumference 15 of the screw-in part 2 are rounded. The transition points 13 between the in the direction of rotation 11 front boundary surface 8th the indentation 7 and the outer circumference 15 of the screw-in part 2 a radius of 0.3 to 0.7 mm, preferably 0.5 mm. The transition 14 between the in the direction of rotation 11 rear boundary surface 9 the indentation 7 and the outer circumference 15 of the screw-in part 2 has a radius of 0.2 to 0.6 mm, preferably 0.4 mm.

The bullet 6 is in its displacement range in the axial direction of the spring 5 in a fitting sleeve 16 is led. The bullet 6 who have favourited Passport Sleeve 16 and the feather 5 are in a bore 17 open to one side in the handle 3 are used. The open end 18 the hole 17 can be closed by a cap or a stopper.

Because of the simple construction is an easy replacement of the torque limiting device if necessary forming parts possible. For example, the effective torque in such a device to change, only the spring itself is replaced. Otherwise no one is needed Settings. It can therefore be used for a special application device with the necessary presetting (special spring). Such a device that actually be designed as a small hand screwdriver can only be used for this one application is used on a machine tool, e.g. for attaching and detaching of indexable inserts for drilling, turning and cutting tools.

The handle 3 can have any shape in itself. In the sense of a material-saving design and above all in terms of better accessibility when used with fasteners, it is advantageous to use the handle 3 as a radially freely projecting wing essentially to one side 19 train. The hole can then be seen from the drawing 17 from that the wing 19 opposite section of the handle 3 , that is from one of the inserted screw-in part 2 the wing 19 opposite section of the handle 3 , going out.

The device according to the invention can be used for any type of bits, that is to say inserts with an attack for fastening means with an external and / or an internal attack. Hence the screw-in part 2 at its freely projecting end with a receiving opening 20 for positive and / or non-positive mounting of a drive 21 equipped with an external or internal attack for fasteners.

With the device according to the invention can even with manual operation with small screw connections, also when screwing in relatively small ones Screws, on a proper setting be observed with a specified screwing torque. Still are high tightening torques possible and furthermore there is also a loosening the fastener can be easily carried out with the same tool.

Claims (12)

Device for manually turning, tightening and loosening fasteners with an external and / or an internal attack, consisting of a screw-in part and a handle, between which a torque limiting device is inserted in order to release the further rotary movement of the handle when a predetermined torque is exceeded, characterized that the torque limiting device ( 4 ) in the handle ( 3 ) arranged spring ( 5 ) and one from the pen ( 5 ) loaded ball ( 6 ) is formed and the screw-in part ( 2 ) at least one indentation running in the axial direction ( 7 ) into which the ball ( 6 ) engages and that the indentation ( 7 ) at least in the area of the ball ( 6 ) with flat boundary surfaces ( 8th . 9 ) is provided, whereby the direction of rotation ( 11 ) front boundary surface ( 9 ) with the by the handle ( 3 ), the screw-in part ( 2 ) and the spring ( 5 ) imaginary middle plane ( 12 ) encloses a larger acute angle (a) than that in the direction of rotation ( 11 ) rear boundary surface ( 9 ). Device according to claim 1, characterized in that the in the direction of rotation ( 11 ) front boundary surface ( 9 ) with the by the handle ( 3 ), the screw-in part ( 2 ) and the spring ( 5 ) imaginary middle plane ( 12 ) includes an acute angle (α) between 15 ° and 45 °, preferably 30 °. Device according to claim 1, characterized in that the in the direction of rotation ( 11 ) rear boundary surface ( 9 ) with the by the handle ( 3 ), the screw-in part ( 2 ) and the spring ( 5 ) imaginary middle plane ( 12 ) includes an angle (β) between 0 ° and 30 °, preferably of 15 °. Device according to claims 1 to 3, characterized in that the transitions ( 13 . 14 ) between the boundary surfaces ( 8th . 9 ) the indentation ( 7 ) and the outer circumference ( 15 ) of the screw-in part ( 2 ) are rounded. Device according to claim 4, characterized in that the transition ( 13 ) between the in the direction of rotation ( 11 ) front boundary surface ( 8th ) the indentation (λ) and the outer circumference ( 15 ) of the screw-in part ( 2 ) a radius of 0.3 to 0.7 mm, preferably 0.5 mm. Device according to claim 4, characterized in that the transition ( 14 ) between the in the direction of rotation ( 11 ) rear boundary surface ( 9 ) the indentation ( 7 ) and the outer circumference ( 15 ) of the screw-in part ( 2 ) has a radius of 0.2 to 0.6 mm, preferably 0.4 mm. Device according to claim 1, characterized in that the ball ( 6 ) in their displacement range in the axial direction of the spring ( 5 ) in a fitting sleeve ( 16 ) is performed. Device according to one of claims 1 to 7, characterized in that the ball ( 6 ), the fitting sleeve ( 16 ) and the spring ( 5 ) in a hole open on one side ( 17 ) in the handle ( 3 ) are used. Device according to one of claims 1 to 7, characterized in that the handle ( 3 ) of a wing that projects freely radially essentially to one side ( 19 ) is formed. Apparatus according to claim 8 and 9, characterized in that the bore ( 17 ) of which the wing ( 19 ) facing section of the handle ( 3 ), i.e. from a screw-in part used ( 2 ) the wing ( 19 ) facing section of the handle ( 3 ), goes out. Apparatus according to claim 10, characterized in that the open end ( 18 ) the bore ( 17 ) in which the wing ( 19 ) facing section of the handle ( 3 ) is closed by means of a cap or a stopper. Device according to claim 1 and one of the preceding claims, characterized in that the screw-in part ( 2 ) a receiving opening at its freely projecting end ( 20 ) for positive and / or non-positive mounting of a drive ( 21 ) for fasteners with an external or internal attack.