DE2935999A1 - Nesting box spanner set - has head containing several axially spring loaded coaxially fitted sockets in mutual rotary locking alignment - Google Patents

Abstract

The spanner set comprises a head (1) with closing plate (3) provided with square openings (4), into which the end of the operating lever is introduced. The other end of the head (1) is open and has a hexagonal inner shape in which several hexagonal box elements (2) are fitted in a coaxial manner. The hexagonal shapes of the box elements (2) are standardised in such a way that the inner shapes fit with the hexagonal head of a bolt, or with the nut, while the outside shaped always lock with the adjacent inner shape and the largest box element locks with the inner surface of the head (1). The head cover-adjacent ends of the box elements (2) are provided with shoulders (7) resting against each other. The shoulder (7) of the smallest box element (2) rests against pressure plates (6,8) and the latter against spring (5) fitted between plate (8) and cover plate (3).

Description

description

to patent application Subject: Keys for screws and nuts 1 sheet of drawings for tightening or loosening nuts and bolts many keys are known. The oldest keys are the fork and ring spanner, which to this day are mainly used in workshops and factories. Also since long socket wrench sets known, which consist of a variety of socket heads consist of differently shaped handles, often provided with a ratchet can be put on.

The advantage of this socket wrench is that it is versatile can be used and can be accommodated in a small space Multi-purpose keys are known, such as the car key. This one has at both ends a rotatable head with four milled openings each with different wrench sizes Another universal key is the so-called "bone", which is often used as a key used on bicycles.

Now there are different screws on machines and devices and nuts of different sizes, which are also often located on very inaccessible It is for this reason that there are a multitude of keys when assembling equipment necessary.

The final price of an assembled device is not only caused by the Material costs, but especially due to the time required to assemble With today's high wage costs, time expenditure plays an essential role and exceeds it often even the material costs. A large part of the time is that a The fitter cannot tighten all the nuts and bolts with a wrench, because Yes, these are different. So the fitter is constantly forced to do his thing Put the key that is still in use down and look for a new key with required This is where it happens easy that the size of a screw head is not correctly recognized and the fitter is reaching for the wrong key.

This mistake, which is unfortunately often repeated, costs time again.

The use of socket wrench sets is even more time-consuming because additional time is required here to put the appropriate plug-in heads on the handle to get stuck.

But also with the universal keys such as the car key or the Bone must always first determine the appropriate wrench size before use or be tried out, which takes time.

In the case of a series production of devices, the amounts listed above add up It takes a lot of time for an eight-hour day. It would be an advantage if a key would fit many screws without the fitter taking the key out of his hand have to take, or as with the car key or the bone, the right one Would have to search for a key width.

Keys have been around for a long time in which the jaws twist can be changed so that the key can be used for different screw heads is.These are also known as "Englishmen". They often resemble a pair of pliers and often vary in shape. The use of such adjustable keys is however even more tedious because it takes a lot of time to adjust the jaws is, While the ring spanner grips all six corners of the head of the head, is The screw head of the adjustable "Englander" is held in place with only two jaws For this reason it can also happen that when fastening or loosening a screw the key (English) slips, which means there is a risk of accident and the screw heads or nuts can be damaged. Conventional adjustable wrenches can of handling them only as an emergency solution or as an alternative to ring or fork wrenches be considered.

They're good around the house and as a car tool, but for use in Production sites too inefficient.

Under the no. Gm 7437913 class IPC B25 B 13/180 is a on May 20th, 1976 Multipurpose key has become known, which is more or less the respective This is designed like a ring spanner, with the Ring is rotatably mounted on the handle. A fixed jaw protrudes into the ring During use, the multi-purpose wrench tightens onto the screw head each jaw of the multi-purpose key has grooves so that the multi-purpose key does not slip off the screw head ..

The disadvantage of this multi-purpose wrench is in contrast to the ring wrench in that the six corners of the screw head are not grasped from all sides.

The nut or the screw head is loaded on one side and through the grooves of the fixed jaw the rust-protecting tin layer becomes Damaged. Once a screw or nut is damaged, it rusts a lot The multi-purpose key only tightens in one direction of rotation this must always be turned once when screws are inserted during assembly or need to be screwed out. Also, this multi-purpose wrench is for something inaccessible screws cannot be used Tube or socket wrench can be used.

The invention is based on the object of addressing the deficiencies listed eliminate and invent a wrench, which one for different screws and nuts can be used without the user having to set the wrench size beforehand Must.Perner, this should be structured in such a way that the user can quickly access the key and can use it spontaneously without having to determine the wrench size beforehand or Having to put down the key.

Solution The solution to the disadvantages listed is characterized in that the key automatically adapts to the screw head or nut.

The key is preferably constructed like a key head in order to to be able to use it on different brackets. The function is based on the Drawings Fig. A, b and c emerge.

Fig. A and b shows the key head in cross section.

Fig.b shows the wrench head in function when screwing a Screw (10) Fig. C. shows the wrench head from the front from the point of view of the screw.

The key head consists of a housing (1) on the inside Is shaped into a hexagonal tube to grasp a screw head in the wrench head there are inserts (2) made of steel, which are like hexagonal tubes with a wall thickness of 1 mm are built up.

In the key head there are many such inserts (2) which always become smaller and can therefore be pushed into one another.

The upper part of the key head is secured by a lock (3) closed, in the middle of which there is a square opening (4) by the spring (5) in connection with a plate (6) all the inserts (2) are pushed forward the inserts do not fall out, edges (7) are attached to the end of these and in the A base (11) is attached inside the housing (1).

If the wrench head is now pressed onto a screw, only those inserts pushed into the inside of the wrench head, those from the screw head be sensed.

The remaining inserts (2) remain in the same place and enclose the screw head, so that the remaining inserts (2) are not also due to the friction are pushed into it, it is necessary that these are held.

This problem is solved according to the invention in that the housing (1) It is well known that the magnetic force is at the end of every permanent magnet the strongest.

This magnetic force at the top of the case attracts the rest Inserts (2) to the front. This device automatically searches for the key head always the right wrench size, because all inserts which are larger than that Screw head, remain untouched and enclose the respective screw head all six corners.

Since the jacket thickness of the inserts (2) is 1mm, the wrench sizes are increasing by 2 mm each. Wrench sizes of e.g. 8,10,12,14,16,18 etc be included in the key head.

The small wall thickness of only 1 mm is not noticeable negatively, because each insert (2) from the next insert to the housing (1) is coated. Of the Pressure when screwing is absorbed by the housing (1).

To prevent the many inserts from being blocked, is located inside the key head a felt washer (8), which is soaked with oil or grease The movement of the inserts when screwing causes the oil to migrate between the Inserts and also prevents rust formation.

Advantages This key head can be opened through the square opening (4) on every common socket wrench with and without ratchet and on motorized screwdrivers apply.

In order to be able to use the key head with other plug-in systems as well, can the lock (3) with the square opening by removing the grub screws (9) be exchanged for a suitable closure with a suitable opening the simple, uncomplicated structure, in which neither electrical nor pneumatic Technology is required, the key head can be manufactured very inexpensively.

A major advance is that very quickly and screws and nuts of various sizes can be screwed spontaneously because the fitter does not need to put the key head down.

Furthermore, no time is lost by constantly determining key widths For this reason, devices and machines can be assembled much faster, which favorably on the production price and, last but not least, on the selling price affects.

Even screws that are difficult to access can be screwed with the wrench head because it is plugged into the usual holders of socket wrench sets can be.

Even faster work is possible in conjunction with a motor Before a screw or nut is tightened, it must as is known, these are first screwed in by hand until the thread is caught is.

The magnetism of the case is also beneficial as the screws stick and now run together with the key head in very tight places and can be screwed in. This also has advantages for fitters who, for example Carry out assembly work on high scaffolding. This does not affect the weight here and size of many keys, but only requires the key head Holder.

Because of the versatility and the small footprint, the key head also an ideal tool kit for cars, motorcycles, planes, etc.

The wrench head encloses the nut or the screw head all six corners like a ring spanner, which means that it is safe and accident-free Work because the pressure when screwing is evenly applied to all six corners of the screw head is distributed.

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Claims (7)

Patent claims key, for screwing nuts and bolts characterized in that "this is shaped into a key head, which consists of a housing (1) in which there are several tubular inserts (2) which are getting smaller and smaller and can therefore be plugged into one another. 2. Key according to claim 1, characterized in that the inserts (2) Like hexagonal tubes, protruding edges are formed at the ends (7) are located. 3. Key according to claim 2, characterized in that it is inside a spring (5) is located, which in connection with a plate (6) the inserts (2) according to pushes forward. 4. Key according to claim 3, characterized in that in this a felt disc (8) or similar oil-sucking disc is located. 5. Key according to claim 4, characterized in that a lock (3) is present, which is fastened by grub screws (9). 6. Key according to claim 5, characterized in that the housing (1) is magnetized, with the magnetic poles at each end of the housing are located. 7. Key according to claim 6, characterized in that the housing (1) The inside is shaped into a hexagon to capture bolts and nuts and a base (11) is present.