CH638416A5 - Chuck. - Google Patents

Description

638 416

PATENT CLAIMS

1.Bore chuck key for actuating a clamping sleeve of a drill chuck, with a shaft piece which bears a toothing which can engage in an associated toothed ring of the clamping sleeve, and with a handle bar which engages on the shaft piece and runs essentially at right angles thereto, characterized in that the handle bar ( 14) an approximately hook-like molded part at a free end

(17).

2. Drill chuck key according to claim 1, characterized in that the hook-like molded part (17) is formed from an arcuate bend (18) with an approximately walking stick-like shape.

3. drill chuck key according to claim 1 or 2, characterized in that the hook-like molded part (17) at the free end of the shorter, transverse to the shaft piece (11) extending beyond this rod arm (15) of the handle bar (14) and arranged as a one-piece part is.

4. Drill chuck key according to claim 2 or 3, characterized in that the arcuate bend (18) to the shaft piece (11) and the toothing (12) points out.

5. drill chuck key according to one of claims 1-4, characterized in that the approximately mouth-like opening (19) of the hook-like molded part (17) is located laterally next to the shaft piece (11).

6. Drill chuck key according to one of claims 2-5, characterized in that the opening width of the mouth-like opening (19) and the remaining inner region (20) of the hook-like molded part (17) is at least 7 mm.

7. chuck key according to claim 5, characterized in that the lateral distance between the shaft piece (11) and the mouth-like opening (19) of the hook-like molded part (17) is at least 7 mm.

8. drill chuck key according to one of claims 2-7, characterized in that the arcuate bend

(18) has approximately a semicircular shape.

9. drill chuck key according to one of claims 1-8, characterized in that the handle bar (14) including its hook-like molded part (17) has a circular cross-section with the same diameter throughout.

PRIOR ART The invention is based on a chuck key according to the type of the main claim. In a known drill chuck key of this type (DE-OS 2 610 935), the handle bar consists of a straight rod that is butt welded to the shaft piece. The rod consists of round material or e.g. also from a hexagonal profile. In the latter case, the rod is angled at approximately a right angle at the longer end, which results in a leg which runs approximately axially parallel to the shaft piece and which can be used as a key for screws with hexagon socket. Such chuck keys have proven themselves. However, the application of larger clamping and loosening forces for clamping or loosening the drill chuck is difficult. It is also unfortunate that the key, as a separate part that can be moved quickly, often has to be searched for when necessary, so it is not always available at hand. You can get an additional part, z. B. in the form of a plastic bottle, by means of which the key can be attached to the electric cable of the drill. However, such an additional part increases effort and costs and can tear off and / or get lost.

Advantages of the invention 5 The chuck key according to the invention with the characterizing features of the main claim has the following advantages. Due to the hook-like molded part, which is simple and cheap e.g. by bending the handle bar into an arcuate bend with a roughly cane-like shape, a larger contact and support surface is created on the chuck key, which enables the operator to apply considerably greater clamping or loosening forces to tension and loosen the drill chuck on the key; because now the lì thumb can attack the hook-like molded part over a relatively large area during these processes. The result is a distribution of the pressure acting on the hook-like molded part, which significantly reduces pressure points on the thumb that hurt or even completely avoids them depending on the force. It is also of particular advantage that the hook-like molded part can also act as a hanging hook of the chuck key. It is thus possible to use the key immediately, easily and effortlessly e.g. to the electric cable of the drill or also to the operator's work clothes, e.g. a belt buckle or the like, or in other suitable places captive and at any time ready to hang on or in. Special additional parts are not required, which simplifies handling and reduces the effort and costs.

The measures listed in the subclaims permit advantageous developments and improvements of the chuck key specified in the main claim. The hook-like molded part, in particular the Bo-35 gene-shaped bend, can lie on the side of the handle bar facing away from the shaft piece with teeth, so that the hook-like molded part protrudes upward beyond the otherwise continuous longitudinal profile of the handle bar. Instead, however, an embodiment is particularly advantageous, as a result of which the hook-like molded part does not protrude outwards and may therefore block the way. The key takes up little space.

Training in accordance with claims 5-7 is particularly advantageous. This makes it easy to use the drill 45 wrench e.g. to hang over an electric cable of the drill so that it is captively connected to the drill and can be quickly and easily removed for use. Due to the design according to claim 8 and the resulting roundness of the bo-50 gene-shaped bend, any risk of injury is eliminated, neither of the electrical cable nor of the operator. The embodiment according to claim 9 simplifies the manufacture and reduces the costs to a considerable extent. This enables trouble-free automation of production.

drawing

An embodiment of the invention is shown in the drawing and explained in more detail in the following description. The drawing shows a side view of a chuck key in natural size.

Description of the embodiment

The chuck key 10 65 shown in the drawing is used to actuate the clamping sleeve of a chuck of a drill. The drill with all of the above parts, including its electrical cable, is not particularly shown. The chuck key 10 is made

from a cylindrical shaft piece 11 which has a toothing 12 which can engage in an associated toothed ring (not shown) of the clamping sleeve of the drill chuck. To support the drill chuck key 10 on the drill chuck, a coaxial pivot 13 is arranged on the side of the toothing 12, which faces away from the shaft piece 11, and is inserted in a known manner into an associated receiving bore on the drill chuck.

At the end of the shaft piece 11 facing away from the toothing 12, a handle bar 14 is butt welded to the latter, e.g. through electrical resistance pressure welding. The central axis of the handle bar 14 is at least substantially perpendicular to the axis of the shaft piece 11. The handle bar 14 has a circular cross section.

The handle bar 14 has two bar arms 15 and 16, both of which protrude laterally beyond the shaft piece 11, the left bar arm 15 in the drawing being considerably shorter than the right bar arm 16. At the free end of the left rod arm 15 there is, in one piece with the latter, an approximately hook-like molded part 17 in the form of an arcuate bend 18 with an approximately walking stick-like shape. The handle bar 14, including this arcuate bend 18, has a continuous circular cross section with a uniform diameter dimension throughout. The Bogenför3 638 416

Mige bend 18 points to the shaft piece 11 and the teeth 12 thereof, wherein the free end of the arcuate bend 18 is aligned approximately parallel to the rod arm 15 and approximately at right angles to the axis of the shaft piece 11. s The arcuate bend 18 is approximately semicircular. Its mouth-like opening 19 is located on the side, in the drawing on the left, next to the shaft piece 11. This side distance is selected at least approximately as large as the outside diameter dimension of the electric power cable (not shown) of the drilling machine. In the same way, the opening width of the mouth-like opening 19 and of the entire remaining inner region 20 of the arcuate bend 18 is chosen to be at least approximately as large as the outer diameter dimension of the electrical cable. Said i5 side distance of the mouth-like opening 19 to the shaft piece 11 is, for. B. at least 6 mm. The clear width of the mouth-like opening 19 and the remaining inner region 20 of the arcuate bend 18 is e.g. about 7 mm in diameter.

20 The chuck key 10 is gripped and released for the chuck (not shown) in the area of the handle bar 14, the thumb being able to rest on the bar arm 15 and the arcuate bend 18 over a large area.

25th

s

1 sheet of drawings