CZ9503226A3 - Safety device for thermostat - Google Patents

Abstract

Between the rotary knob (7) and the safety sleeve (4) is a connecting element (5) disposed in different ways angled positions relative to the rotary knob (7). The connecting element (5) is adapted to be non-rotatably connected to with the rotary knob (7) and with the safety sleeve (4), or allows a limited rotation of the rotary knob (7) with respect to it to the thermostat housing (6) to set the setpoint between two setpoint limits. One border setpoints are selectable by non-rotatable connection of the connecting element (5) in the angled angular position corresponding this setpoint limit relative to the rotary button (7).

Description

SECURITY EQUIPMENT FOR THERMOSTAT

Technical field

BACKGROUND OF THE INVENTION The present invention relates to a safety device for a thermostat connected to an adjusting valve, in particular for a radiator, for securing the thermostat against theft and damage and for securing the sleeve, axially ribbed rotary knob on the thermostat housing against predetermined rotation. in particular to provide a set angularly rotated position, the security device comprising a safety sleeve which on one hand engages the connection between the thermostat housing and the adjusting valve and on the other hand engages the rotary knob and is adapted for non-rotatable connection with the thermostat housing and the rotary knob.

BACKGROUND OF THE INVENTION

In a known security device of this kind (DE 26 03 461 C3), it is only possible to lock the rotary knob by means of a safety collar so that the set temperature setpoint cannot be changed by turning the rotary knob.

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SUMMARY OF THE INVENTION

SUMMARY OF THE INVENTION The invention is based on the object of providing a locking device of the kind in which it is possible to lock the rotary knob not only at a predetermined set point, but also to set the rotary knob to a selectable setpoint range which is smaller.

than normal range

According to the invention, this object is solved by a safety device for a thermostat connected to an adjusting valve, in particular for radiators, to secure the thermostat against theft and damage and to secure the sleeve, axially ribbed rotary knob on the thermostat housing against predetermined rotation. setting a setpoint, in particular to provide a set angularly rotated position, wherein the security device comprises a safety sleeve which, on the one hand, engages via the connection between the thermostat housing and the adjusting valve and on the other hand engages via a rotary knob, and is adapted for non-rotatable connection with the thermostat housing and the rotary knob. According to the invention, a connecting element is provided between the rotary knob and the safety sleeve, which in different angular positions relative to the rotary knob is either adapted to be non-rotatable with the rotary knob and the safety sleeve or allows limited rotation of the rotary knob relative to the thermostat housing for adjustment setpoints between setpoint limits, of which at least one limit is selectable by a non-rotatable connection of the fastener at an angular position corresponding to that limit

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PV 3226-95 setpoints relative to the rotary knob.

In this solution, therefore, the security sleeve not only constitutes a theft and damage protection device, but in combination with the coupling element also permits a fixed preset setpoint or a preset setpoint limit.

The adjustment is preferably performed for a limited range of adjustment of the rotary knob, offering a range between its minimum position and its center position, or between its center position and its maximum position. In this way, it is possible to ensure that the actual temperature value either does not exceed the adjustable upper limit value or does not fall below the adjustable lower limit value.

Furthermore, it is advantageous if the rotary knob is conical and the connecting element forms a ring with axial ribs on its inner side corresponding to the ribs of the rotary knob. Thus, before the safety sleeve is placed in position, the ring may be pushed into the desired angularly rotated position, axially to the rotary knob, or, after removal of the safety sleeve, may be removed from the rotary knob.

It is desirable to engage the coupling element and the safety sleeve in a locked engagement, for which the elements are adapted accordingly. In this way, a high degree of protection against undesirable relative rotation of the coupling element and the safety sleeve is guaranteed.

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In addition, the connecting element may have axial projections, and the projection formed on the inside of the security sleeve may engage the gap between the projections so that it is at rest with respect thereto. When the projection of the safety sleeve engages the central gap between the projections of the fastener, the rotary knob can no longer rotate, the safety sleeve and the thermostat housing being coupled so that they cannot rotate relative to each other. If, on the other hand, the projection of the safety sleeve lies outside the gap between the projections of the fastener against one or the other projection of the fastener, the rotary knob can only rotate in a direction of rotation in which the projections of the safety sleeve and the fastener do not engage. Thus, the projections of the fastener limit the range of adjustment of the setpoints in one direction of rotation to a preset value.

Furthermore, it is advantageous if the safety sleeve and the thermostat housing are arranged to be engaged with each other. In this way, the safety sleeve and the rotary knob are reliably protected against unwanted rotation.

A locked engagement between the safety sleeve and the thermostat housing can be achieved, for example, by having the safety sleeve on its inner side having a approximately U-shaped projection which engages over the axial bridge of the thermostat housing.

The safety sleeve may consist of two separate halves which may be connected by means of screws, in particular special screws and nuts. This allows easy assembly

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PV 3226-95 safety sleeve on the rotary knob or, if necessary, removing it, to change the setpoint without allowing or facilitating unauthorized persons to remove the safety sleeve.

List of Figures

BRIEF DESCRIPTION OF THE DRAWINGS The invention is described in detail with reference to the drawings, in which: FIG. 1 is an exploded view of a security device according to the invention with a thermostat connected; FIG. 2 is a perspective internal view of one half of the security device; 1, FIG. 4 is a perspective view of the thermostat of FIG. 1 with the safety device of the invention in a collapsed state, partially in section, and FIGS. 5-8 perspective. a view of the thermostat, with the safety device of FIG. 1 mounted, in different rotated angular positions between the coupling element and the safety sleeve.

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0 ’o

£

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DETAILED DESCRIPTION OF THE INVENTION

FIG. 1 shows a conventional, commercially available thermostat 1 for controlling the adjustment of the radiator valves. The safety sleeve 4 is divided into a first half 2 and a second half 2- In connection with the safety sleeve 4, the safety device further comprises a ring-shaped connecting element 2.

The thermostat 1 (FIGS. 1 and 3) has a thermostat housing 2, a rotary knob 7 arranged rotatably thereon to adjust the set point, and a connecting nut 2 which is arranged to rotate at one end of the thermostat housing 2. thermostatic control. The spring setpoint counteracts the vapor pressure prevailing in the actuator and its support can be axially displaced by the rotary knob 2 to adjust the set point. The actuator carries a plunger which acts without a fixed connection to the valve shaft

The valve shaft 2 acts on the valve closure member 2 illustrated in FIG. 3. The connection between the valve 2 and the thermostat housing 2 is formed by the coupling nut 2 and the threaded coupling piece 10 of the thermostat housing 2 to which the coupling nut 2 is screwed. The thermostat housing 2 has circumferential ribs 11, 12, 12 which are connected to axial bridges 14. 12, 16.

The rotary knob 7 tapers to an end remote from the adjusting valve 2 so that the annular connecting element 2 can be axially pressed against the rotary knob 2 on the rotary knob 2 to the axial position shown in FIG. 3.

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When the connecting element 5 is pressed, the axial ribs 17 (FIG.

1) on the inside of the connecting element 5 engage in axial grooves 18. forming the same angular interval as the axial ribs 17, between the axial ribs 15 on the outside of the rotary knob 7, so that the connecting element 5 and the rotary knob 2 are locked in engagement and cannot rotate relative to each other.

The connecting element 5 also has axial projections 20 between which there is a gap 21 or a slot.

The first half 2 of the security sleeve 4 has on its inside a side projection 22 (see FIGS. 2 and 4 to 8) in the form of an axial rib which, when assembled, fits into the gap 21 between the axial projections 20, as illustrated in FIGS.

6. Furthermore, the first half 2 has on its inner side a projection 23 of approximately U-shape which, when the thermostat 1 and the safety sleeve 4 are assembled, engage over the bridge 15 of the thermostat housing 5 (FIG. 5) so that the safety sleeve 4 and the thermostat the housing 5 is in a locked engagement. The opening 24 in the first half 2 makes it possible to see the setpoint scale 25 in the form of axially parallel markings I, II, III, IIII.

The other half 5 of the security sleeve 4 has on its inner side two disk segments 26 (see FIG. 1) of a ring-shaped disk that extends in the circumferential direction of the second half 5 of the security sleeve 4 and extends radially inwards. One disk segment 26 engages in the assembled state between the peripheral ribs 11 and 12 and the other disk segment 26 engages between the peripheral ribs 12 and 13 of the thermostat housing 5, just

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like the U-shaped projection 23 shown in FIG. 5 engages between the peripheral ribs 11 and 12. The second half 2 is further provided with second through holes 27 in the radial flange and the first half 2 is provided with first through holes 28 in the radial flange. The respective screw 29 shown in the drawings is only one of them, extending through each through hole 28. 27 and screwed into a nut (not shown) to connect the two halves 2, 3 of the security sleeve 4, the security sleeve 4 flush with the thermostat outline. and engages over the connection formed here by the nut 8 and the threaded connecting piece 10 between the thermostat 1 and the adjusting valve 2, so that on the one hand it improves the strength of the connection between the thermostat 1 and the valve 9 and It is not easily accessible, but is accessible only after removing the safety sleeve 4. For this purpose, special screws 29 with nuts are used, which can only be loosened by means of a special screwdriver.

The mode of operation of the alarm device with respect to the setpoint setting is described in detail below.

When the rotary knob 7 is to be fixed to the setpoint III on the setpoint scale 25, the thermostat housing 6 and the rotary knob 7 are rotated against each other prior to mounting the safety sleeve 4 so that the mark 30 provided on the thermostat housing 6 is aligned and aligned 3. The connecting element 5 is then pressed axially on the rotary knob 7 in an angularly rotated position such that the gap 21 between the axial projections 20 is disposed axially with the center line of the web 15 (FIG. 3). alike

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PV 3226-95 aligns with mark 30 and setpoint III. The halves 2, 3 of the security sleeve 4 are mounted such that the side projection 22 formed on the inner side of the first half 2 engages the gap 21 (see FIGS. 5 and 6) and the other U-shaped projection 23 formed on the inner side of the first half 2. It engages over the bridge 15 of the thermostat housing 3 as shown in FIG. 5. The halves 2, 3 are then firmly connected together by screws 29 to the nuts. The rotary knob 7 can no longer rotate with respect to the thermostat housing 5, since the thermostat housing 6 and the rotary knob 7 are locked to each other by the safety sleeve 4 and the connecting element 3 and are secured against rotation. However, the setpoint III remains permanently set.

If, on the other hand, the setpoint is to be adjustable within a limited range, for example between a low value corresponding to the closed position of valve 3 and III corresponding to the semi-open position of valve 3, the thermostat housing 6 and rotary knob 7 are equally opposite 3 and 7. The connecting element 3, however, is pushed onto the rotary knob 2 in such a rotated angular position relative to the rotary knob 2 that the axial projection 20 on the left side of Fig. 7 lies slightly to the right. from the center of the reference mark III. The halves 2, 3 of the safety sleeve 4, on the other hand, are mounted on the thermostat housing 4 in the same position as in FIG. 6, so that the lateral projection 22 lies opposite (in FIG. 7) the left edge of the left axial projection 20. in the direction of the first arrow 31 in FIG. 7 together with the connecting element 3 with respect to the thermostat housing 6 and the safety sleeve 4, so that

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PV 3226-95 • The setpoint can be set within a limited range between low value and III.

In this way, the setpoint can be set within a limited range ranging from the middle setting of the adjusting valve 9, which corresponds, for example, to the setpoint II, to the open position of the adjusting valve 2, which corresponds to the maximum setpoint. 7. rotate against each other so that the mark on the scale 25 corresponding to the set point II is aligned with the mark 30. The connecting element 5 is pressed on the rotary knob 7 in such a rotated angular position that the right edge of the right axial projection 20 on FIG. 8 lies somewhat to the left of the mark corresponding to the set point II, so that, after the safety sleeve 4 is mounted, the side projection 22 lies opposite the right edge of the right axial tab 20 and similarly aligns with the mark corresponding to the set point II. The rotary knob 7 can rotate together with the connecting element 2 with respect to the thermostat housing 6 and the safety sleeve 4 from the position shown in FIG. 8 only to the left in the direction of the second arrow 32 (counterclockwise), corresponding to a setpoint between setpoint II and maximum setpoint. Turning the rotary knob 7 to the right in the opposite direction against the second arrow 32 outside the positions shown in FIG. 8 is impossible because the right axial projection 20 would stop against the side projection 22.

Represented by:

Dr. Miloš Všetečka

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......

JUDr. Milos Všetečka advocate

120 00 Prague 2, Halkova 2

Claims (9)

PATENT CLAIMS Safety device for a thermostat (1) connected to an adjustment valve (9), in particular for radiators, for securing the thermostat (1) against theft and damage and for securing the sleeve, axially ribbed rotary knob (7) on the thermostat housing (6) against a predetermined rotation, wherein the rotary knob (7) is adapted to adjust the setpoint, in particular to provide a set angularly rotated position, the security device comprising a safety sleeve (4) which on one side engages via a connection between the thermostat housing (6) and the adjusting valve (9) and on the other hand engages over the rotary knob (7) and is adapted to be non-rotatably connected to the thermostat housing (6) and the rotary knob (7), characterized in that between the rotary knob (7) and the safety sleeve (4) a connecting element (5) is provided which is in different angular positions adapted to the rotary knob (7) either for non-rotatable connection with the rotary knob (7) and the safety sleeve (4), or allows limited rotation of the rotary knob (7) with respect to the thermostat housing (6) to set the setpoint between two setpoint limits of which at least one limit is selectable by a non-rotatable connection of the connecting element (5) in a rotated angular position corresponding to that setpoint limit with respect to the rotary knob (7). Security device according to claim 1, characterized in that the limited adjustment range 16 68231 (68231j.doc) PV 3226-95 • 12 of the rotary knob (7) extends between its minimum position and its middle position or between its middle position and its maximum position. Security device according to claim 1 or 2, characterized in that the rotary knob (7) is conical and the connecting element (5) is a ring with axial ribs on its inner side corresponding to the ribs of the rotary knob (7). Security device according to claim 3, characterized in that the coupling element (5) and the security sleeve (4) are adapted to engage a mutually locked engagement. Security device according to claim 4, characterized in that the connecting element (5) has axial projections (20) and a side projection (22) is formed on the inside of the security sleeve (4), which is adapted to engage the a gap (21) between the axial projections (20) so as to abut them. Security device according to one of claims 1 to 6 5, characterized in that the safety sleeve (4) and the thermostat housing (6) are adapted to be interlocked. Security device according to one of claims 1 to 7 6, characterized in that the safety sleeve (4) has on its inner side a projection (23) of approximately U-shape which engages the axial bridge (15) of the thermostat housing. 16 68231 (68231j.doc) PV 3226-95 <i S -,? 22é · «« * »* * * 32 32 32 32 Security device according to one of Claims 1 to 7, characterized in that the security sleeve (4) comprises two separate halves (2, 3). Security device according to claim 8, characterized in that the separate halves (2, 3) are connected by means of screws (29).