JP2738730B2 - thermostat - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a gas thermostat for temperature control used in refrigerators, showcases and the like.

2. Description of the Related Art In recent years, there has been a growing demand for cost reduction in thermostats.
A method that can reduce man-hours can be considered.

A conventional technique will be described with reference to FIG. Reference numeral 1 denotes a temperature sensing unit that senses the temperature of the control unit and causes a pressure change. Reference numeral 2 denotes a metal container frame formed in a U-shape. Is attached, and a resin case 3 containing a switch (not shown) is attached to another opening. The two sides 2 'of the casing 2 are provided with two angular holes 2 ". The case 3 has a convex portion 3 which fits into the two square holes 2" of the casing 2. ′
Are formed, and a part of the convex portion 3 'is cut in a triangular shape. 4 is a dial for adjusting the temperature setting.

In the thermostat thus formed, the casing 2
When assembling the case 3, the opening of the casing 2 is widened, the convex portion 3 ′ of the case 3 is fitted into the square hole 2 ″ of the casing 2, and the triangular cut of the convex portion 3 ′ of the case 3 is formed. A method of deforming and caulking a part of the frame 2 was adopted.

However, in the above-described configuration, when inserting the case into the container frame, the opening of the container frame must be expanded by hand, and after the insertion, a step of shaping is required, so that the workability is increased. However, there is a risk that the case may be chipped or cracked during the caulking process.

SUMMARY OF THE INVENTION An object of the present invention is to provide a thermostat which has good workability, can easily attach a container frame and a case, can prevent chipping and cracking during caulking, and has stable quality.

Means for Solving the Problems In order to achieve this object, the present invention is to provide a rectangular U-shaped container frame with rectangular cutouts on two side surfaces, and a bottom surface oriented from the end to the center. The case that is provided with a cut-and-raised portion and has a built-in switch and a convex portion that fits with the cut-out portion is provided on two side surfaces of the case, and a surface that is in contact with the cut-and-raised portion of the case frame on a side surface that is opposite to the bottom surface of the case frame Is provided with a concave portion which is a slope, and a flat plate-shaped temperature sensing portion is provided with an engaging portion with the container frame at one end, and a square hole having a projecting portion on one of four sides at the other end, and a bottom surface of the case and On the opposite surface, a projection is provided which is compatible with the square hole having the projection.

Action According to the above configuration, the case is inserted from the opening of the casing using the rectangular cutout on the side of the casing and the convex portion of the case as a guide,
Furthermore, the cut-and-raised part of the bottom of the case fits into the case recess, and the cut-and-raised end of the bottom of the case comes in line contact with the slope of the case recess. Because it can be held down firmly and keeps the case from coming off, the case can be firmly attached to the container frame with one touch, and the protrusion on the opposite surface of the case bottom is a temperature sensing part When the square hole is fitted with the square hole, the protrusion of the square hole is fitted into the protrusion of the case by press-fitting, so that mounting without rattling can be performed.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 and 3. In the figure, reference numeral 21 denotes a metal container frame (hereinafter, referred to as a container frame) having a substantially U-shape including two side surfaces 21a and a bottom surface 21b, and having openings in three directions. And the container frame
The two side surfaces 21a of 21 are provided with rectangular notches 22, 22, respectively, and the bottom surface 21b has two raised portions 23, 23 from the end toward the center. One opening other than the opening facing the bottom surface 21b has a wall surface (not shown) bent from the two side surfaces 21a, and one end of the wall surface has two square holes (not shown).

Reference numeral 24 denotes a case which is attached to an opening opposite to the opening having the wall surface 21c of the container frame 21 and has a switch portion (not shown) inside, and has a substantially vertical shape. The two side surfaces 24a of the case 24 have a pair of rectangular convex portions 26 and 25, and the other side surface 24b has a slope that is in contact with one end of the cut-and-raised portion 23 of the container frame 21. There are two recesses 26,26. A pair of convex portions 25, 25 in the case 24 are formed to have dimensions that fit with the rectangular cutouts 22 of the container frame 21, and the case 24
The two recesses 26, 26 in 24 are formed in such a size that the cut-and-raised portion 23 of the casing 21 is in contact with the slope 26a and can be stored.
Further, the side face 24c facing the case side face 24b has two protrusions.
There is 24d. The bottom surface 24e of the case 24 has a pair of terminals 27, 27 electrically connected to a switch unit (not shown) incorporated in the case.

Reference numeral 28 denotes a temperature adjusting dial which is inserted into and attached to a hole (not shown) on the bottom surface 21b of the casing 21. Reference numeral 29 denotes a capillary extending to the temperature detecting unit, and reference numeral 30 denotes a bellows whose gas pressure changes due to a temperature change. Reference numeral 31 denotes a flat plate-like temperature sensing portion 31 for holding the capillary 29 and the bellows 30. Two tongue-like portions 31a are provided at one end, and two square holes 31b are provided at the other end.
The four sides of the square hole 31b have a protruding portion 31c whose central portion protrudes in a triangular shape. The temperature detecting section 31 has one end in a side face 21c at an opening facing the bottom face 21b of the casing 21.
The square hole 21d is engaged with the tongue-shaped portion 31a, and the other end is
The two projections 24d on the side surface 24c of the case 24 fit into the projections 31b.

Next, a procedure for attaching the case 24 to the casing 21 will be described. First, the case 2 is inserted into the pair of rectangular cutouts 22, 22 of the casing 21.
The projections 25, 25 of FIG. Next, the bottom surface 24e of the case 24 is pushed in so that the side surface 24b of the case 24
The two raised portions 23, 23 are in the lifted state. Further, when the bottom surface 24e of the case 24 is pushed in,
One of the cut-and-raised portions 23, 23 tries to fit into the concave portions 26, 26 of the case 24. At this time, the slope 26a of the concave portion of the case 24 and the tip of the cut-and-raised portion 23 of the container frame 21 are in line contact with each other,
Try to hold down 24. At the same time, the projection 25 of the case 24
Cross section 33, 33 on the side of the rectangular notch 22 of the casing 21
, The case 24 is fixed to the container frame 21.

Further, the temperature sensing portion 31 engages with the tongue-shaped portion 31a and a square hole (not shown) in a side surface (not shown) of the casing 21 to form a temperature sensing portion.
Two square holes 31b of 31 and two projections of side 24c of case 24
24d is press-fitted and attached by the protrusion 31c of the square hole 31b.

With such a configuration, the case attached to the casing 21
In the case 24, movement of the projection 25 of the case 24 in the vertical and horizontal directions is restricted by the rectangular notch 22 of the casing 21. In addition, the case
Cross section 3 of the projecting surface 25a of the projection 25 of 24 and the rectangular cutout 22 of the casing 21
3 and the end faces of the two raised portions 23 of the casing 21 are
By making line contact with the slope 26a of the concave portion 26 provided on the side surface 24b of the case 24, the movement in the insertion and withdrawal directions is regulated.
That is, the convex portion 25 of the case 24 is fitted into the rectangular cutout of the casing 21, and the bottom surface 24 e of the case 24 is pushed in from the end of the casing 21 toward the center, thereby cutting the two cuts of the casing 21. Raising part 2
3 and 23 are inclined surfaces 2 of the concave portion 26 of the side surface 24b of the case 24.
By making line contact with 6a, the case 24 can be firmly fixed to the casing 21 in any direction without rattling. Further, the end face dimension of the cut-and-raised part 23 always comes into contact with a part of the slope 26a of the concave part 26 of the case 24, and even if the dimensions of each part vary, play in the pulling-out direction does not occur.

Further, after the case 24 is mounted on the casing 21, the protrusions 24d of the case side surfaces 24c are fitted by press-fitting by the protrusions 31c of the square holes 31b of the temperature sensing unit 31, so that rattling occurs even if the respective dimensions vary. No protrusion, even if the degree of press fit is large
Since only one point 31c abuts, the protruding portion 24d is cut by the protruding portion 31c so that the fitting can be performed relatively easily. Also square hole
Since the protruding portions 31c extend from the three sides of 31b, they can be securely caulked without any play in any of the left, right, front and rear directions.

Effect of the Invention As described above, in the present invention, the rectangular cutouts on the two side surfaces of the container frame, the cut-and-raised portion on the bottom surface, the convex portion on the two opposite side surfaces of the case, the concave portion on one of the other side surfaces, and the concave portion on the other side. A flat surface temperature sensing part has a tongue-shaped part at one end and a square hole with a projected part at the other end. Therefore, when inserting the case into the container frame, it is possible to omit the step of expanding and caulking the container frame opening by hand, thereby reducing man-hours, and further, connecting the container frame and the case. Lack of case when
Cracks can be prevented, and even if the dimensions of each part vary,
It is possible to provide an excellent thermostat that does not cause backlash and has stable quality.

[Brief description of the drawings]

1 is an exploded perspective view of a thermostat showing one embodiment of the present invention, FIG. 2 is a side view of FIG. 1, FIG. 3 is a detailed view of a square hole of a temperature sensing unit, and FIG. 4 is a conventional example. FIG. 2 shows a side view of a thermostat main body. 21 ... container frame, 22 ... rectangular notch, 23 ... cut and raised part, 24 ...
... Case, 24d ... Protrusion, 25 ... Convex, 26 ... Concave, 2
6a ... slope, 31 ... temperature sensor, 31b ... square hole, 31c ...
Projection.

Continuation of the front page (56) References JP-A-59-63629 (JP, A) JP-A-59-119631 (JP, A) JP-A-62-110219 (JP, A) JP-A-62-110220 (JP) JP-A-62-172619 (JP, A) JP-A-62-180924 (JP, A) JP-A-62-256334 (JP, A) JP-A-62-256335 (JP, A) JP-A-1-302626 (JP, A) JP-A-1-302627 (JP, A) JP-A-2-10619 (JP, A) JP-A-2-10620 (JP, A) A) Fully open sho 56-38949 (JP, U) Full open sho 56-165345 (JP, U) Full open sho 60-99750 (JP, U) Full open sho 62-79342 (JP, U) Full open sho 63 −121345 (JP, U) Jikken 133044 (JP, Y1) Jikken 46-1001 (JP, Y1)

Claims (1)

(57) [Claims] 1. A substantially U-shaped container frame having a bottom surface and two opposite side surfaces, and one end of the three opening portions of the three opening portions, which is attached to a position facing the bottom surface, is engaged with the container frame. A case in which a flat plate-shaped temperature sensing portion having a square hole at the other end and a switch housing attached to one of two openings other than the opening facing the bottom surface of the housing; The two side surfaces are provided with rectangular notches, the bottom surface is provided with a notch portion from the end toward the center, and the two side surfaces of the case are provided with protrusions that fit into the notches of the container frame. The bottom surface of the case is provided with a concave portion whose surface in contact with the cut-and-raised portion of the container frame is an inclined surface, and the square hole of the temperature sensing portion has a protruding portion on any one of four sides, and the case On the surface facing the bottom surface, there is a substantially angular projection, and the projection fits into the square hole by press-fitting. Thermostat, characterized in that arranged at a position.