JP2667208B2 - 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 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. The sensing unit 1 is attached to one opening of the container frame 2. A resin case 3 containing a switch (not shown) is attached to the other opening. The two sides 2 'of the case frame 2 are provided with two square holes 2 ". The case 3 has a convex portion 3 which fits into the two square holes 2" of the case frame 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. The method of deforming and caulking a part of the frame 2 was adopted.

However, in the above configuration, however, in 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 caulking is required, The workability is poor, the man-hour is increased, and 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 at the time of caulking, and can stabilize 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 which is provided with a cut-and-raised portion and which has a built-in switch is provided with a convex portion which is compatible with the above-mentioned cutout portion, and a surface which is in contact with the cut-and-raised portion of the above-mentioned case frame on a side surface opposite to the bottom surface of the case frame. Is provided with a concave portion which is a slope.

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 portion of the bottom of the case fits into the case recess, and the cut-and-raised end of the bottom of the case is line-connected to the slope of the case recess. It can be fixed to the case frame with one touch because it can be held down and the case is prevented from falling off.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 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.

Numeral 24 has a switch portion (not shown) inside a case attached to one opening of the container frame 21, and has a substantially rectangular shape. The two side surfaces 24a of the case 24 have a pair of rectangular projections 25, 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 casing 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 into the rectangular cutouts 22 of the case frame 21, and two concave portions 26, 26 in the case 24 are cut and raised of the case frame 21. The portion 23 is formed in such a size that it can be in contact with the slope 26a and can be stored. The bottom surface 24c of the case 24 has a pair of terminals 27, 27 that are 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 temperature sensing unit for holding the capillary 29 and the bellows 30. The temperature sensing unit 31 is attached to one opening of the casing 21.

Next, a procedure for attaching the case 24 to the casing 21 will be described. First, the case 2 is formed in the pair of rectangular notches 22 and 22 of the device frame 21.
The projections 25, 25 of 4 are fitted. Next, by pushing down the bottom surface 24c of the case 24, the two cut-and-raised portions 23, 23 of the casing 21 are lifted by the side surfaces 26c of the case 24. Then, when the bottom surface 24c of the case 24 is further pushed in, the two cut-and-raised portions 23, 23 of the casing 21 try 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,
When the leading end of the cut-and-raised portion 23 of the casing 21 is in line contact, the contact case 24 is to be pressed down. At the same time, the convex part of case 24
25, a protruding surface 25a and a cross section 33 on the rectangular notch 22 side of the container frame 21,
By hitting 33, the case 24 is fixed to the casing 21.

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
24 convex section 25 convex surface 25a and cross section 33 of rectangular notch 22 of container frame 21
And the end faces of the two raised portions 23 of the casing 21 are line-connected to the slopes 26a of the recesses 26 provided on the bottom surface 24c of the case 24, thereby restricting the movement in the insertion and withdrawal directions. .
That is, the convex portion 25 of the case 24 is fitted into the rectangular notch of the casing 21, and the bottom surface 24 c 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 the slopes 2 of the concave portions 26 of the bottom surface 24c 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 one part of the slope 26a of the concave part 26 of the case 24, and even if the dimensions of each part are uneven, play in the pulling-out direction does not occur.

Effect of the Invention As described above, in the present invention, the rectangular notch on the two sides of the container frame, the cut-and-raised portion on the bottom surface, the convex portion on the two side surfaces of the case, and the concave portion of the case frame on the other side surface. Since the surface in contact with the cut-and-raised end surface has a slope, 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. It provides an excellent thermostat that can prevent chipping and cracking of the case when caulking the case and case, and does not cause backlash even if the dimensions of each part vary, stabilizing the quality You can do it.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a thermostat showing an embodiment of the present invention, FIG. 2 is a sectional view of a main part of a thermostat main body, and FIG. 3 is a side view of a thermostat main body in a conventional example. 21 ... container frame, 22 ... rectangular notch, 23 ... cut and raised part, 24 ...
... case, 25 ... convex part, 26 ... concave part, 26a ... slope, 31
… Temperature sensor.

Continuation of front page (56) References JP-A-55-62631 (JP, A) JP-A-62-180924 (JP, A) JP-A-62-256334 (JP, A) JP-A-62-256335 (JP, A) , A) JP-A-63-133416 (JP, A) JP-A-2-10620 (JP, A) Japanese Utility Model Application No. 55-69354 (JP, U) Japanese Utility Model Application No. 56-2546 (JP, U) Japanese Utility Model Application No. 62-79342 (JP, U)

Claims (1)

(57) [Claims] 1. A substantially U-shaped container frame having a bottom surface and two opposite side surfaces, a temperature sensing portion attached to one of three openings of the container frame, and a bottom surface of the container frame facing the bottom surface. And a case accommodating a switch attached to one of the two openings other than the opening to be formed. A rectangular notch is provided on two side surfaces of the casing, and a center is provided on the bottom surface from the end to the center. A cut-and-raised portion is provided facing the portion, and a convex portion that fits into the notch of the cut-frame is provided on the two side surfaces of the case, and the bottom surface of the case has a slope in contact with the cut-and-raised portion of the container frame. A thermostat characterized by having a concave portion.