JPH032866Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a bimetallic indicator.

[Background of the idea]

Conventionally, examples of this type of bimetal indicator include those shown in FIGS. 8 to 11, for example. A pointer shaft 23 is supported in an upright state by a frame 22 of a bimetal indicator 21, and a resin collar 24 is rotatably inserted and held in this shaft 23. A cylindrical portion 32 of a pointer 25 made of resin is press-fitted into the collar 24. 26 is a link plate integrally formed with the collar 24;
A slot 27 is formed therein. 28 is a bimetal whose one end is fixed to the frame 22 and has a pin 29 protruding from the other end, and a heating wire 30 is wound around this bimetal 28. Also, the above pin 29 is inserted into the slot 2 of the link plate 26.
7 is loosely fitted. Reference numeral 31 denotes a dial of the instrument, and the dial 31 has a through hole 33 through which the cylindrical portion 32 of the pointer 25 is inserted. 35 is an engagement protrusion integrally formed at the base of the collar 24, and an engagement recess 36 corresponding to the engagement protrusion 35 is formed at the lower end of the cylindrical portion 32; 35 and the engagement recess 36, the pointer 25 and the link plate 26 are positioned. Further, a retaining protrusion 37 is formed on the engaging protrusion 35 , and a retaining recess 38 is formed on the edge of the engaging recess 36 , and the retaining protrusion 37 and the retaining recess 38 are engaged with each other. The fitting between the pointer 25 and the collar 24 is maintained by this. Note that 34 indicates a part of the housing case, and 43 indicates a washer.

However, in such a conventional bimetal indicator, the collar 24 and the pointer 25 are made of resin, and the pointer 25 is made of resin.
Since the pointer 25 is press-fitted into the pointer 25, the silicone oil applied between the pin 29 and the slot 27 or between the washer 43 and the link plate 26 will adhere to the fitting part of the pointer 25, thereby preventing the fitting. The friction coefficient of the joint decreases, and as a result, the cylindrical portion 3 of the pointer 25
There was a problem in that the pressing force of 2 was reduced and the pointer 25 easily fell off from the collar 24.

Furthermore, the direction of the pointer body 25' of the pointer 25 is determined when the cylindrical portion 32 of the pointer 25 is press-fitted into the collar 24.
An engagement recess 36 formed at the lower end of the cylindrical portion 32
by engaging with an engaging protrusion 35 formed on the collar 24. Since the direction of the pointer body 25' is determined by the longitudinal direction of the plate 26, in order to adjust the orientation of the pointer body 25', the mounting position and direction of the frame 22 must be changed, or the position of the engaging recess 36 can be adjusted to a fixed position in the longitudinal direction of the pointer body 25'. It is necessary to separately manufacture a pointer whose angle has been relocated, and the number of types of pointers increases, and the frame 22
There were some difficulties in the actual use of the bimetal indicator, as the free attachment of the indicator was sometimes restricted.

[Purpose of invention]

The present invention was developed by focusing on these conventional problems, and it allows the pointer and collar to always be fitted with a stable engagement force, and also allows the pointer body to be oriented in any direction and the pointer to be attached to the collar. The object of the present invention is to provide a bimetallic indicator that can be used.

[Example of idea]

Hereinafter, the present invention will be explained in detail based on the embodiment shown in FIGS. Illustrated.

1 is a resin link plate having a slot 27 at one end into which a pin 29 protruding from a bimetal 28 is inserted; behind the slot 27 is an insertion hole 2 into which a pointer shaft 23 is inserted. A cylindrical collar 3 is erected. Four concave grooves 4 extending downward from the upper end of the collar 3 are formed at equal intervals in the circumferential direction on the outer circumference of the collar 3. It is formed with a tapered surface that is slanted toward the That is, the width across the bottom wall surface of the facing grooves 4 formed in the collar 3 is such that the dimension A at the upper end of the collar 3 is larger than the dimension B at the lower end. Reference numeral 5 denotes a resin pointer in which a cylindrical portion 7 that fits into the collar 3 extends downward from the base end of the pointer body 6, and a groove formed in the collar 3 is formed on the inner peripheral wall surface of the cylindrical portion 7. 4, four axially extending protrusions 8 are formed at equal intervals in the circumferential direction, and are adapted to engage with the grooves 4, respectively. This protrusion 8 is formed into a tapered surface that slopes radially outward as it rises upward from the lower end of the cylindrical portion 7, and the taper of this protrusion 8 is formed to have the same slope as the taper of the groove 4. has been done. That is, the width dimension of the opposing protrusions 8 is such that the dimension C at the lower end of the cylinder is smaller than the dimension D above it. And this cylindrical part 7
One of the four protrusions 8 formed in
The dimension in the width direction of the collar 3 is finished with high precision, and the dimension in the width direction of the groove 4 formed in the collar 3 is also finished with high precision.

The structure of this embodiment has been described above, and the assembly process will now be explained.

First, the orientation of the pointer main body 6 is determined, and the protrusion 8 formed on the cylindrical portion 7 of the pointer 5 is aligned with the groove 4 formed in the collar 3, and the cylindrical portion 7 is pushed in. At that time, the width of the concave groove 4 widens at the upper end of the collar 3, and the length of the protrusion 8 narrows at the lower end of the cylindrical part 7, so the press-fitting allowance becomes the largest at the initial stage of pushing. By elastically deforming outward in the radial direction by this press-fitting amount, the concave groove 4 and the protrusion 8
Engagement is performed. And further guideline 5
is pushed in until the lower end of the cylindrical portion 7 comes into contact with the upper surface of the link plate 1a base portion 1a. The taper of the bottom wall surface of the concave groove 4 of the collar 3 and the taper of the protrusion 8 are formed in opposite directions, and since each taper is formed with the same inclination, the protrusion The outer end surface of the pointer 8 is pressed into contact with the bottom wall surface of the groove 4, that is, the pointer 5 is fixed to the collar 3 without any half-hearted press-fitting. Furthermore, the pointer 5 is positioned by engaging the protrusion 8 with the groove 4.

[Effects of embodiments of the invention]

As described above, according to this embodiment, four grooves 4 are formed at equal intervals along the axial direction on the outer circumference of the collar 3, and the width across the bottom wall surfaces of the opposing grooves 4 is determined by the upper end. The cylindrical portion 7 of the pointer 5 is formed with a tapered surface that widens at the side and narrows at the lower end, and has a projection 8 along the axial direction that corresponds to the groove 4 and engages with the groove 4 on the inner circumferential surface of the cylindrical portion 7 of the pointer 5. Four of the protrusions 8 are formed at equal intervals, and the outer end surfaces of the opposing protrusions 8 are tapered so that the upper end side is wider and the lower end side is narrower. Press 5,
Since the pointer 5 is fixed to the collar 3, the cylindrical part 7 undergoes the largest elastic deformation in the radial direction at the initial stage of pushing, and thereafter the cylindrical part 7 is pushed in while elastically restoring, and the cylindrical part 7 deforms to the collar 3. cylindrical part 7
Because of the pressure engagement due to the elastic restoring force of
Even if the pointer 5 swells, it is possible to prevent the pointer 5 from falling off.

Further, four grooves 4 are formed at equal intervals on the collar 3, and four protrusions 8 are formed at equal intervals on the inner peripheral surface of the cylindrical portion 7 of the pointer 5, corresponding to the grooves 4. By changing the engagement position of these grooves 4 and protrusions 8, as shown in FIG.
This provides the advantage that the mounting position of the pointer body 6 can be arbitrarily selected in any one of the four directions.

Furthermore, the concave groove 4 is finished with high precision,
One of the protrusions 8 has a high precision finish, so
Since the protrusion 8 engages with the groove 4 without play, an effect of improving the pointing accuracy of the pointer 5 is obtained.

In addition, in this embodiment, the groove 4 is formed on the collar 3 and the protrusion 8 is formed on the cylindrical part 7, but the protrusion 8 on the collar 3 and the groove 4 on the cylindrical part 7 may be formed with a reverse taper. .

[Summary of the idea]

As explained above, in the present invention, one end of the link plate 1 has a slot 27 into which a pin 29 erected at the tip of a bimetal 28 is inserted.
A collar 3 through which the pointer shaft 23 passes is provided on the outer periphery of the collar 3, extending in the axial direction and spaced at equal intervals in the circumferential direction of the collar 3, and having a width across the tip of the collar 3 inward. A plurality of concave grooves 4 are provided on a tapered surface that is inclined to be larger than the width across the section, and on the inner periphery of the cylindrical section 7 of the pointer 5 that fits into the collar 3,
a protrusion 8 formed to correspond to the groove 4 and have the same slope as the tapered surface and to engage with the groove 4;
This is a bimetallic instrument characterized by having a plurality of .

[Effect of idea]

Therefore, according to the bimetal indicator according to the present invention, at the initial stage when the cylindrical portion 7 of the pointer 5 is pushed into the collar 3, the engagement step portions 4 and 8 formed on the cylindrical portion 7 and the collar 3, respectively, close the cylinder. The portion 7 undergoes the largest elastic deformation in the radial direction, and then the cylindrical portion 7 is pushed in while restoring elastically and is pressed against the collar 3 by the elastic restoring force, so the cylindrical portion 7 is fixed to the collar 3 in an extremely stable state. and further the cylindrical part 7
In order to pull out the pointer 5 from the collar 3, the cylindrical part 7 must be elastically deformed in the radial direction due to the reverse taper of the engaging steps 4 and 8.
It can be fixed without falling off and the effect can be obtained.

Further, by changing the engagement position between the groove 4 and the protrusion 8, an effect can be obtained in which the direction of the pointer 5 can be freely changed. Furthermore, in the present invention, a plurality of concave grooves 4 are provided on the outer periphery of the collar 3, extending in the axial direction and spaced at equal intervals in the circumferential direction of the collar 3,
On the other hand, on the inner periphery of the cylindrical portion 7 of the pointer 5 that fits into the collar 3, a plurality of protrusions 8 that correspond to the grooves 4 and engage with the grooves 4 are provided.
When the cylindrical part of the pointer 5 is pushed into the collar 3, deformation easily occurs in the inner periphery of the cylindrical part other than the protrusion 8, so that a resilient fitted state is obtained, and moreover, a reliable positioning action is obtained in the rotational direction. It has the effect of

[Brief explanation of the drawing]

Fig. 1 is a sectional view of essential parts showing an embodiment of the bimetallic indicator according to the present invention, Fig. 2 is a plan view of the same, Fig. 3 is a side view of Fig. 2, and Fig. 4 is a sectional view of the same as Fig. 2. 5 is a sectional view showing an embodiment of the guide according to the present invention, FIG. 6 is an enlarged sectional view of the main part of FIG. 5, and FIG. 7 is a sectional view of FIG. 8
The figure is a perspective view of a conventional bimetallic indicator, FIG. 9 is a sectional view of the same as above, FIG. 10 is an exploded perspective view of the cylindrical part and collar of the same as above, and FIG. The figure shows. 1... Link plate, 2... Insertion hole, 3...
Collar, 4...Concave groove, 5...Pointer, 6...Pointer body, 7...Cylindrical portion, 8...Protrusion.

Claims (1)

[Scope of utility model registration request] A link plate 1 having a slot 27 into which a pin 29 erected at the tip of a bimetal 28 engages.
A collar 3 through which the pointer shaft 23 passes is provided at one end, and a collar 3 extending in the axial direction and spaced at equal intervals in the circumferential direction of the collar 3 on the outer periphery of the collar 3 and extending at equal intervals at the tip of the collar 3. A plurality of concave grooves 4 are formed on an inclined tapered surface so that the dimension is larger than the width across the inner part, and on the inner periphery of the cylindrical part 7 of the pointer 5 that fits into the collar 3, A bimetallic instrument characterized in that a plurality of protrusions 8 are provided corresponding to the grooves 4 and having the same slope as the tapered surface and engaging with the grooves 4.