JPS6221124B2 - - Google Patents

Abstract

1. Stopping and locking device for an adjusting spindle (17), particularly a screw spindle of a thermostat, with a disk (20), optionally constructed as a stop disk, arranged in non-rotary manner on the inner end of spindle (17), and which is at least partly subject to the action of a pressing member (24), a resilient stopping element (27) on the pressing member (24) cooperating with a part on the disk (20), characterized in that the pressing member (24) is in the form of a ring (29) with externally joined, approximately rectangular shoulders (28) and displaced by 180 , and has at least two pressing parts (25), arranged symmetrically with respect to the axis of spindle (17) whilst, when viewed from the centre of the ring, stopping element (27) is shaped like a W and cooperates with a corresponding dog (26), ring, or the like on disk (20).

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a locking and fixing device for a regulating spindle, in particular a temperature regulator, comprising a disc non-rotatably arranged at the inner end of the spindle, the disc being In some cases, it is designed as a stop disk and is at least partially loaded by a pressure element, the elastic locking element of the pressure element cooperating with a corresponding part of the disk. related to things.

Fixing devices have already been proposed in which the pressing element consists of an elongated elastic strip plate with a central hole for the passage of the inner end of the screw spindle. In this case, each half of the elongated plate is provided with a cut towards the bottom and the stop disk is provided with a recess that cooperates with the cut. This recess together with the cutout forms a locking device. In this case, however, the notch belonging to the locking device also presses onto the stop disk in other angular positions of the adjusting spindle. The problem with this solution is that even the smallest irregularities in the sliding surface of the stop disk become immediately noticeable in the rotational moment and even in the case of very high special surface pressures. The object of the invention is to improve a locking and locking device of the type mentioned at the outset in such a way that it has a rotation prevention that is as uniform as possible over the entire rotation range.

To solve this problem, the invention proposes a device of the type mentioned at the outset, in which the locking element is only effective in the range of locking positions. With the arrangement according to the invention, the locking element is used only for locking, while the rotational restriction by the push element is achieved independently of the locking element.

In a further embodiment, the invention provides that the pressure element has at least two pressure parts, which pressure parts are arranged symmetrically with respect to the axis of the spindle. The symmetrical arrangement has the advantage that the pressing part presses uniformly onto the disc. In this case, it is particularly advantageous if the pressure element is arranged so as to act broadly on at least the edge of the disk, since a suitable lever arm is thereby obtained. According to a preferred embodiment of the invention, the pressing element is 180
It has the form of a ring with outwardly connected substantially square projections arranged offset by . The diameter of the ring then corresponds approximately to the diameter of the disk, so that the pressure part actually acts on the edge of the disk, and the square outer projection serves to fix the pressure element. A symmetrical arrangement is also advantageous here, since the pressure parts act with the same force on the disc.

In a further embodiment, the invention proposes that the locking element is arranged inside the circular ring. This has the advantage that the locking position is clearly perceptible but does not require large forces for forming the locking position and for overcoming the locking position.

According to another feature of the invention, the ring has a downwardly convexly curved cross section. This configuration makes it possible to punch out rings made of plate material, since the convex curvature of the cross section gives the rings high stability and good sliding properties.

The pressure part is advantageously formed by a groove in the ring. This groove is easily created at the same time as the ring is manufactured.

It is a particularly suitable manufacturing method if the pressure element is stamped out of a sheet material and the grooves and convex shapes are produced by embossing.

In another embodiment of the invention, the locking element has the shape of a W when viewed from the ring center point and cooperates with corresponding cams, pins, etc. of the disc. The locking position is then determined in that the cam lies between the inner legs of W, while the outer legs of W facilitate the insertion of the cam into the locking position.

For fixing the pressure element, it is proposed that the pressure element can be snapped on by means of a projection on the rear projection of the U-shaped closure frame. This snappability means easy assembly of the fastening device according to the invention.

In a particularly preferred embodiment of the invention, there are two pressure parts, which are located on a straight line passing through the axis of the adjusting spindle and perpendicular to the axis connecting the projections. With this configuration it is achieved that the spring constant for both parts is the same, which leads to an equal amount of pressing force on both pressing parts and thus to a very uniform rotation prevention of the adjusting screw.

Other features, details and advantages of the invention will be understood from the following description of preferred embodiments and the drawings.

In the temperature regulator shown in FIG. 1, the specific temperature regulator portion has been omitted for simplicity. The temperature regulator consists of a housing 11 to which a plate 12 is screwed on the front side, and the plate is provided with projections 13 for fixing to a microwave oven or the like. A spindle nut 14 with an internal thread is mounted in the housing. The spindle nut 14 has an annular projection 16 at the end located inside the housing 11. A threaded spindle 17 is screwed into the internal thread of the spindle nut 14 and has a rotation knob 18 at its outer end. The inner end 19 of the threaded spindle 17 has a non-circular cross section;
and is only briefly shown in FIG. Unlike what is shown in FIG. 1, the inner end of the spindle 17 actually extends through the disc 20 for a considerable length;
Its tip can perform functions such as switching, and its base can be moved between a free position, a locked position, and a rotational position by means of a click ball device (not shown).

A disc 20 is mounted non-rotatably on the inner end 19 of the threaded spindle 17. A closing frame 21 is likewise arranged inside the housing and has a cutout 22 at its end. This cutout is used for fixing the inner housing cover, and after placing the cover, the closing frame 21 is located above the cutout 22.
part is twisted. The closing frame 21 has its protrusion 23
The pressing element 24 is held by (FIG. 5). This pressing element is connected to the disk 2 by means of two pressing parts 25.
0 and press it against the top surface of the protrusion 16. Since the protrusion 16 is fixed to the housing, the pressing of the disk 20 against the protrusion 16 exerts enough friction to stop the threaded spindle 17 from rotating during rotation. The inwardly facing side of the disc 20 is provided with a cam 26 which is secured in the position shown in FIG. 1 by an elastic locking element 27. This locking element 27 has the shape of a W, the specific locking position being ensured by the cam 26 being located between the inner legs of the W. The outer leg of W serves to facilitate the engagement of the cam 26 into the locking position.

The pressing portion 25 of the pressing element 24 in FIG. 1 is formed by the pressing element 24 having a downwardly flexing portion within this area. In this case, the pressing element 2
The pressing portion 23 that grips the threaded spindle 17
passes through the longitudinal axis of , and both protrusions 2 of the pressing element 24
It is located on a straight line perpendicular to the straight line connecting 8 (Fig. 2).

In FIG. 2 a top view of the pressure element 24 according to FIG. 1 is shown. The - line in FIG. 2 corresponds here to the cross-section of the pressure element 24 in FIG. The pressing element has the form of a ring 29 which is arranged offset by 180 DEG and is provided with two outwardly connecting substantially square projections. As can be seen in FIG. 1, the ring 29 has a downwardly convexly curved cross section. The transition of the projection 28 to the ring 29 is reinforced by a groove 30. A locking element 27 is arranged inside the ring 29 .

3 and 4 show exact top views of the disk 20 shown only schematically in FIG. 1. FIG. Disk 2
0 has a central opening 31 which is non-circular and has a cross-section corresponding to the cross-section of the inner end of the threaded spindle 17. In order to strengthen the non-rotatable connection between the screw spindle 17 and the disk 20, the upper surface of the plate 20 is provided with a projection 32 corresponding to the cross section of the central opening 31.
has. This protrusion 32 is not shown in FIG. A cam 26 is likewise arranged on the upper surface of the disc 20, which together with a locking element 27 determines the locking position. The disk 20 has a constant curvature over most of its circumference, and on its lower left side in FIG. Together with the disposed projections 34 they form stops for limiting the rotational movement of the screw spindle on both sides. The upper surface of the disk 20, which is represented in FIG. 3 and which forms the contact surface with the pressing portion 25, is preferably non-planar, such as the pressing point.

In FIG. 5, a closure frame 21 is shown. The closure frame can be screwed inside the housing 11. The closure frame has a central hole 35 through which the spindle nut 14 passes. For this purpose U's web 3
6 can be expanded relative to the legs 37.
The leg 37, which is easily bent outwards in the unloaded state, has a projection 23 on its inside, which is formed in part by punching out the leg 37.
This projection serves to secure the projection 28 of the pressure element 24. For this purpose, the pressure element 24 is inserted between the legs 37 from above, the end of the projection 28 sliding over the projection 23 and snapping into the rear of the projection. Both pressing portions 25 are located approximately in the center of the pressing element 24 and press against the disc 20.

The illustrated embodiment of the invention shows its use with a threaded spindle. However, the invention can also be used for other adjusting spindles in which threaded spindles are not present. In this case, it must naturally be taken into account that the adjusting spindle is fixed in the axial direction.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional top view of the device according to the invention;
2 is a top view of the pressing element according to the invention, FIG. 3 is a top view of the stopper disk, FIG. 4 is a side view of the stopper disk according to FIG. 3, and FIG. 5 is a view of the pressing element mounted. It is a side view of a closure frame. Reference numeral in the figure, 27...Locking element.

Claims (1)

Claims: 1. A disk 20 non-rotatably arranged at the inner end of the adjusting spindle 17, in particular the threaded spindle 17 of the temperature regulator, which disk is optionally designed as a stop disk. and is at least partially biased by a pressure element 24 , in which case the pressure element 24 of the elastic locking element 27 cooperates with a part of the disc 20 . In the device, the pressing element 24 is a ring 29 with laterally extending substantially rectangular projections 28 arranged offset by 180°.
and at least two pressing parts 25 arranged symmetrically with respect to the axis of the spindle 17 , the locking element 27 having a W-shape when viewed from the ring center point and a corresponding one of the discs 20 . Locking and fixing device for the adjusting spindle, characterized in that it cooperates with projections 26, pins, etc. 2. Locking and fixing device for an adjusting spindle according to claim 1, wherein the locking element 27 is arranged on the inner surface of the ring 29. 3. Locking and fixing device for an adjusting spindle according to claim 1 or 2, wherein the ring 29 has a downwardly convexly curved cross section. 4. The pressing portion 25 is formed by the groove 30 of the ring 29.
Locking and fixing device for an adjusting spindle according to any one of the preceding clauses. 5. There are two pressing parts 25, which are located on a line passing through the axis of the adjusting spindle 17 and perpendicular to the line joining the projections 28. Locking and fixing device for an adjusting spindle according to any one of the above. 6. The adjusting spindle according to any one of claims 1 to 5, wherein the pressure element 24 is punched out of a sheet material and the grooves and depressions are produced by stamping. Locking and fixing device for. 7. The pressing element 24 is snap engageable with the rear projection 28 of the projection 23 of the substantially U-shaped closure frame 21. Locking and fixing device for the adjustment spindle of.