DE1575201C - Bracket for attaching a rotary knob on a control shaft - Google Patents

Description

lighten. To be proportionate even with rotary knobs Soft material to ensure a good fit of the clamp in the knob is the stretched one Leg of the clamp on its surface facing away from the opposite leg provided sawtooth-like projections.

The invention is described below using an exemplary embodiment shown in the drawing explained in more detail. It shows

A b b. 1 is an elevation view of the clip according to the invention,

A b b. 2 shows a side view of the clip according to FIGS. 1 and

A b b. 3 the bracket according to A b b. 1 and 2 in the assembled state.

The U-shaped bracket 1 shown in the drawing is a stamped part made of spring steel strip that is produced in the simplest possible manner. The legs 2 and 3 and the web 4 of the clamp 1 have approximately the same cross section. The transition between the legs 2 and 3 and the web 4 is rounded. The leg 2 of the clamp 1 is straight and has several known sawtooth-like projections 5 on its surface facing away from the leg 3. The limb 3 of the clamp 1 is convexly curved in its central region in the direction of the limb 2 and has a short, straight central piece 3 a running parallel to the limb 2. At its free end, the leg 3 is designed as a claw-like tongue 6 . Furthermore, the free ends of the legs 2 and 3 have rounded portions 2 b and 3 b on their opposite surfaces.

The in the A b b. 3 has a circular cross-section and is provided at its free, a rotary knob 8 receiving end with a known flattening la . The rotary knob 8 has a hollow cylinder-like extension 8 α , the opening 9 of which accommodates the switching shaft 7 is adapted to the switching shaft cross-section, ie the opening 9 also has a flat 9 a corresponding to the flat 7 α of the switching shaft 7. In the hollow cylinder-like extension 8 a , a slot 10 extending perpendicularly to the flattening 9 a in both directions is provided, which is used to receive the clamp 1. The width of the slot 10 corresponds to the thickness of the clip 1, and its length is slightly greater than the clip length. Furthermore, the height of the slot 10 relative to the receiving opening 9 is so arranged that, when the clamp 1 is inserted, the inner surface of the elongated leg 2 is tangent to the receiving opening 9, while the curved leg 3 protrudes with its center piece 3 α into the receiving opening. The clip is held in place in the slot 10 by the claw-like tongue 6 on the one hand and by the sawtooth-like projections 5 on the other hand, and the distance between the opposing surfaces of the legs 2 and 3 is smaller than the smallest transverse dimension of the remote end of the switching shaft 7.

The rotary knob 8 prepared in this way is now pushed onto the control shaft 7 until the end of the control shaft 6 rests on the web 4 of the clamp 1. Due to the roundings 2 b and 3 b of the legs 2 and 3, this pushing-on process is facilitated. During this pushing-on process, the leg 3 of the clamp 1 is compressed against its spring action, and the spring force exerted by this leg 3 on the flattening la of the control shaft 7 holds the rotary knob 8 on the control shaft 7 as a result of the friction between the control shaft 7 and the clamp 1 .

The clamp 1 according to the invention, in addition to its simple production, has the advantage that it increases the pull-off force of the rotary knob 8 from the control shaft 7 is only necessary, the height of the Slit 10 to be reduced slightly.

List of reference symbols

1 bracket

2 legs

2 b rounding

3 legs

3 a middle piece

3 b rounding

4 bridge

5 protrusions

6 tongue

7 shift shaft
la flattening

8 rotary knob

8 a approach

9 opening

9 a flattening
10 slot

1 sheet of drawings

Claims (2)

1 2: - ■■ ■ These known brackets have to be produced in several patent claims: Work steps by first cutting them to size, then bending them and then hardening them 1. U-shaped clip made of spring steel with the must. The mounting arrangement with these one straight leg and one curved leg 5 brackets are required when the pull-off force is in advance non-positive fastening of a rotary should be certain limits, very tight production button on a segment-like flattened tolerances of the control shaft, rotary knob at the point and End of a switching shaft, thereby marked in particular the clamp (bending process), which only shows that the bracket (1) as a whole as er-U-shaped under great, unjustified effort Stamped part is formed, the io can be aimed. one leg (2) straight and the other one In addition, only the brackets must transfer the leg (3) convex curved with a straight required switching torque from the rotary knob to and parallel to the opposite leg (2) control shaft, whereby large cross-sectional middle piece (3 a) and a tongue (6), which is absolutely necessary for a claw dimensions of the clamps, are formed at its free end. forms is and both legs (2, 3) on the free The invention is therefore based on the object End on the inner opposite narrow a clip made of spring steel for attaching a see roundings (2 b, 3 b) . Knob on the flattened segment-like 2. Clamp according to claim 1, characterized in that the end of a switching shaft is created which identifies at that the straight leg (2) of the 20-fold training only the axial displacement of the Clamp (1) on the other leg (3) of the rotary knob prevents (securing against the turned away Side with known saw-pulling of the button) and thus a good fastening tooth-like projections (5) is provided. of the rotary knob ensures without the clamp even the slightest forces must be transmitted from the rotary knob to the shift shaft. With a U-shaped clip made of spring steel with a straight and a curved leg for the non-positive fastening of a rotary knob The invention relates to a U-shaped one segment-like flattened end of a switch bracket made of spring steel with a straight and 30 shaft, this object is achieved according to the invention a curved leg for frictional release that the clamp as a whole as a U-shaped fastening of a rotary knob is formed on a segment-like stamped part, one leg flattened end of a control shaft. straight and the other leg curved convexly with It is known to have a straight and parallel to the opposite one made of plastic and with a hollow cylindrical extension to the center piece running on the legs and a claw receiver a cylindrical selector shaft provided like tongue is formed at its free end Rotary knob by means of one in the wall of the hollow and both legs at the free end to the inner one cylindrical neck arranged stud screw opposite narrow sides roundings on to fasten the selector shaft. With such a wise man. The knob can be fastened as a result of its material slightly out in the area of the stud. it says that the straight leg of the bracket break. In addition, the fastening and on the side facing away from the other leg Loosening such a button cumbersome and with known sawtooth-like projections time consuming. is provided. Furthermore, it is known to fasten a rotary 45 The bracket according to the invention is produced as a pure button on a switching shaft, the rotary knob with a stamped part of high accuracy in a simple block of a cut approximately corresponding to the shaft diameter and does not subsequently require a bore and a groove to be provided. More on that in the additional work steps.
Slotted in the middle and with two segment-like ab- Because the clamp does not transmit any switching torque Flattened shaft end is a U-shaped 50 must, but only pushed the knob to prevent pulling the bent bracket so that it is secured from the control shaft, the clamp is designed with very small cross-sectional dimensions when inserting the control shaft into the knob,
one leg clamped in the slot of the shaft. Such a clamp can be easily and the other leg engages in the groove of the rotary knob in an axially extending slot of a rotary knob. 55 button, whereby the claw It is also known to secure the position of the clamp in the slot in a U-shaped manner on a tongue-like tongue that is flattened segment-like. The bent clamp is inserted between these clamp legs, one of which is pushed in with a corrugated shaft end, and the rotary knob is executed on the flattened leg, which is held by friction on the switch shaft.
others with claw-like projections on the opposite side, with large manufacturing tolerances, the opening receiving the overlying cylindrical side of the control shaft is tilted. The rotary knob has a cross-section to avoid that of the rotary knob, the curved segment-like flattened switching shaft end has a straight and parallel to the speaking, but larger bore on the leg of the bracket. When the button is centered on the shaft on the opposite side, 65 pieces claw into each other. The free ends of the legs are on the tongue-like projections of one leg on their opposite surfaces with Abder bracket in the shaft, since both legs are rounded, which brace the insertion of the switching of the bracket in the bore. shaft into the bracket in the rotary knob.