JP2973184B2 - Temperature sensor device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature sensor device mounted on a cooking stove and used for detecting overheating of a pot.

[0002]

A temperature sensor device of this type has a structure in which an inverted cup-shaped holder having a temperature sensor therein is placed on a cylindrical shaft and urged upward by a spring. (See, for example, Japanese Patent Application Laid-Open No. 8-126575). The shaft is fixed to the stove body, and the upper end of the holder is pressed against the bottom of the pan.

In this temperature sensor device, in order to protect the lead wire of the temperature sensor from being twisted, a rotation stopping means for preventing the holder from rotating with respect to the shaft is essential. Further, in order to protect the lead wire of the temperature sensor from being rubbed and scratched at the lower end of the shaft as the holder portion is moved up and down, a scratch prevention means is essential.

Conventionally, as a rotation stopping means, a structure is used in which vertically extending and recessed strips are formed on an outer periphery of a spring receiving portion provided on an upper portion of a shaft and an inner periphery of a holder portion so as to engage with each other (see above). Gazette).

In this structure, the spring receiving portion and the holder portion are
Each of them has a shape having a step-like portion and the like, and in addition to this shape, it is necessary to form the concave and convex strips by processing such as deep drawing, so that the production is difficult and the production cost increases.

Conventionally, a structure in which a metal fitting for fixing a lead wire is provided at the lower end of a shaft is used as a means for preventing damage (see the above-mentioned publication).

With this structure, the number of parts is increased, the assembly is troublesome, and the cost is high.

An object of the present invention is to simplify the manufacturing process and simplify the assembling work by using the above-mentioned means for protecting the lead wire as a simpler structure with a smaller number of parts.

[0009]

According to the present invention, an inwardly projecting edge is formed at a lower end of a holder as a rotation stopping means, and a non-circular engaging hole is provided in the edge to form an engaging hole. In this configuration, a hole is engaged with a shaft having a non-circular outer periphery.

[0010] The edge of the holder and the engaging hole can be formed by press working, and can be manufactured easily and inexpensively as compared with conventional deep drawing.

Further, the present invention provides a method for preventing scratches,
In this configuration, the lower end of the shaft and the periphery of the through hole in the upper portion of the bracket are caulked so that the inner periphery has a smooth curved surface.

The lead wire is protected by the smooth curved surface on the inner periphery of the caulking stopper, and the bracket, which is an essential part for attaching the temperature sensor device to the stove body, is
By using as a means for preventing damage, a conventional metal fitting for fixing a lead wire is not required, and the number of components is reduced.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The specific shape of the non-circular shape of the engagement hole of the rotation stopping means and the shaft is arbitrary as long as the holder can be raised and lowered and cannot rotate. For example, the engagement hole has a shape in which one or a plurality of protrusions are provided on a part of a circle, and the shaft has a concave groove for fitting the protrusion, and the engagement hole has one or more protrusions on a part of the circle. With a notch,
Shafts having a ridge fitting into the notch, engaging holes and a shaft having a polygonal shape such as a hexagon or an octagon are used.

The specific configuration of the crimp preventing portion of the damage preventing means is arbitrary as long as the inner periphery has a smooth curved surface and does not damage the lead wire. It is appropriate to provide an edge protruding inward or outward at the lower end of the shaft, and to caulk the edge and the through hole.

It is also possible to use only one of the rotation stopping means and the damage preventing means of the present invention. in this case,
Otherwise, conventional means will be used. Of course, it is also possible to use both.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

In the temperature sensor device 10, the holder portion 11 is configured such that a cap 13 is attached to the tip of a cylindrical holder main body 12 by press-fitting so that the whole becomes an inverted cup shape. A temperature sensor 14 is provided on the inner surface of the cap 13.
Are connected to each other.
5, 15 extend downward. An inwardly protruding edge 16 is formed at the lower end of the holder body 12.
Are formed with engagement holes 18 having four circular projections 17. The edge 16 and the engagement hole 18 are
It is manufactured simultaneously by press working. Further, a punch 19 protruding inward is formed on a side surface of the holder body 12.

The shaft 20 has four concave grooves 21,.
And a holder 11 on the upper outer periphery.
, And the projections 17,... Of the engagement holes 18 are engaged with each other, so that the holder portion 11 can move up and down and cannot rotate.
A spring receiving portion 22 having a slightly larger diameter is formed on the upper portion of the shaft 20, and a spring 23 is provided between the spring receiving portion 22 and the inner surface of the cap 13.
1 is urged upward from the shaft 20. The lower end of the spring receiving portion 22 contacts the punch 19 to hold the holder portion 11 so as not to be pulled out from the shaft 20. At the lower end of the shaft 20, an inwardly projecting edge 2
4 are formed.

The bracket 25 is formed of a substantially inverted L-shaped plate. The vertical portion 26 is provided with mounting holes 27, 27, and is fixed to a stove body (not shown) using the mounting holes 27, 27. Is done. A through hole 29 is provided in the upper horizontal portion 28, and the edge 24 of the shaft 20 is caulked by bending the periphery of the through hole 29 from the top to the outside. The crimp stop portion 30 has a smooth curved inner surface, and the lead wires 15 are penetrated therein.

The assembly of the temperature sensor device 10 is performed as follows. That is, the holder main body 12 is fitted to the shaft 20 from below, and then the bracket 25 is fixed by caulking.
Then, the cap 13 to which the temperature sensor 14 and the lead wires 15 and 15 are attached is pressed into the holder main body 12 and fixed.

[0021]

By using the rotation stopping means of the present invention, the holder portion only needs to form an edge portion and a non-circular engagement hole, so that difficult processing such as deep drawing is not required, and a simpler process is possible. The press working makes it possible to manufacture inexpensively and efficiently.

When the scratch preventing means of the present invention is used, a metal fitting for fixing the lead wire becomes unnecessary, the number of parts is reduced, and an operation for inserting and fixing the lead wire through the metal fitting becomes unnecessary. Is also simplified. Further, since no metal fitting is used, a large hole is formed at the lower end of the shaft, and a thick lead wire can be used. Therefore, as a temperature sensor, a bimetallic sensor that directly operates a safety device with a thick lead wire can be used, in addition to a sensor that only extracts a signal to be sent to an amplifier with a thin lead wire such as a thermistor.

[Brief description of the drawings]

FIG. 1 is a front view of one embodiment of the present invention.

FIG. 2 is a central longitudinal sectional view of the same example.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Temperature sensor apparatus, 11 ... Holder part, 12 ... Holder main body, 13 ... Cap, 14 ... Temperature sensor, 15 ... Lead wire, 16 ... Edge part, 17 ... Projection, 18 ... Engagement hole, 19 ...
Punch, 20: shaft, 21: concave groove, 22: spring receiving portion, 23: spring, 24: edge, 25: bracket, 26
... vertical part, 27 ... mounting hole, 28 ... horizontal part, 29 ... through-hole, 30 ... crimp stop part.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G01K 1/14 F23N 5/02 A47J 27/00

Claims (2)

(57) [Claims] 1. A shaft having an inverted cup shape and having a temperature sensor inside the upper end, a shaft having a cylindrical shape and having an upper outer periphery on which the holder portion can be raised and lowered and cannot rotate, and an upper portion of the shaft and the shaft. A spring that is provided between the upper portion of the inner surface of the holder portion and urges the holder portion upward, an edge portion formed at a lower end of the shaft and protruding inward or outward, and a through hole at an upper portion, A bracket attached to the stove main body, and a crimping stopper that joins the periphery of the through hole and the edge of the shaft and has a smooth curved inner surface to penetrate the temperature sensor lead wire without damaging it. A temperature sensor device characterized by the above-mentioned. 2. A holder having an inverted cup shape and having a temperature sensor inside the upper end, an edge formed at the lower end of the holder and protruding inward and having a non-circular engagement hole, and an outer periphery. Has a non-circular cylindrical shape, engages with the engaging hole, the holder portion can move up and down on the outer periphery of the upper portion, and the shaft is non-rotatably covered between the upper portion of the shaft and the upper portion of the inner surface of the holder portion. Provided, a spring for urging the holder portion upward, an edge formed at the lower end of the shaft and projecting inward or outward, and a bracket having a through hole at the top and attached to the stove body, A temperature sensor having a crimp stop portion that connects the periphery of the through hole and the edge of the shaft, and has a smooth curved inner surface to penetrate the lead wire of the temperature sensor without damaging it. apparatus.