JPS62150622A - Thermostat device with leakage proof casing - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Prior Art and Problems] A thermostatic device whose lower part is a drawn or pressed cup-forming portion has already been disclosed. The cup can be a conductor or an insulator depending on its structure. A bimetallic element is attached to a certain portion of the cup and serves as the operating mechanism for the thermostatic device. The opening of the cup is then closed by attaching some type of lid. Further, the lid may be made of a conductor or an insulator.

In particular, when the cup and lid are formed from electrically conductive materials, prior to final assembly of the device, a plate of insulating material is typically placed on the ridge formed in the cup member, and the lid is placed on top of this. The side edges of the cup are then rolled to clip the lid and insulating member into place. This type of structure is described, for example, in U.S. Pat. No. 3,100,827.
Inventor - Grimshaw and No. 3.
430.177 No. 1 Inventor - Audett
e).

As shown in the referenced patent, the sides of the cup are usually rolled up to clip the lid and insulating plate to the cup, and the ends of the device are not clipped. Thermostatic devices are often used on motor windings that are face impregnated after winding. When using a thermostatic device such as the one described above, since the edges are not clipped, the edges may leak into the thermostat device before it dries, causing the device to malfunction or even disrupting its normal operation. Operation may be impaired.

Clipping the lower cup-shaped member together with the intermediate insulating member to the upper lid is a preferred method from operational and especially economical points of view, and prevents leakage of insulating material into thermostatic devices formed in this way. Various measures have been taken to prevent this, but no success has been achieved so far. For example, an insulating plate placed between the cup and the lid may be impregnated with a B-stage resin that hardens with the heat of the device. Attempts have also been made to similarly seal the ends of the device with Glyptal (glyceryl phthalate) resin, General Electric Co., Ltd.'s alkyd type polymer, or other similar polymers.

However, the B-stage resin impregnated into the insulator is ineffective, and while the glyptal seal prevents leakage of the insulating material, the glyptal itself leaks causing problems similar to those of the insulating face.

[Means for solving problems]

The thermostatic device according to the invention is generally constructed according to the precepts of the prior art. That is, it means that the cup-shaped member of the casing is drawn or pressed and that the actuating bimetal is attached to this cup-shaped member. An insulating member is then inserted over the cup, typically placing the insulating member over a ridge formed on the cup-like member. The lid rests on the insulating member and has fixed contacts mounted on its inner surface. After assembly, the upright wings on the cup are folded back to clip the lid in place, and the insulating member is held between the cup and the lid.

However, according to the invention, the lid is not entirely flat. During clipping, the edges of the lid that are not directly colored are drawn at least slightly into a molded or depressed portion.

If desired, the entire lid may be drawn to provide the same effect, or the edges of the lid may be shaped slightly.
It is also possible to draw some of the lid to form a molded part, leaving a flat part.

When the sides of the lid are clipped in place, the molding of the lid compresses at the outer edge, thereby exerting pressure along the entire length of the mold. This creates pressure between the end of the lid and the adjacent portion of the cup-like member, and the insulating member is sandwiched between the three. This pressure prevents leakage of liquid, such as a face normally applied to the motor windings, into the working parts of the thermostatic device, allowing normal operation of the fruiting device.

〔Example〕

In the accompanying drawings, FIG. 1 is an enlarged perspective view of various parts of the thermostat device according to the present invention, including a lower cup-shaped member 1, a bimetallic element 2, a temporary 3 made of an insulating material, and an upper M.
Consists of 4. The downward force knob member has a cup IO, a ridge 11 extending around the opening of the cup 10, and two upright wings 12. A lead wire is clipped to a terminal 13 formed at one end as part of the ridge.

The bimetallic arm 2 is attached to the cup-shaped member 1 at its end 20. The mounting point is not important, bimetal 2
may be attached to the bottom of a drawn or press-formed cup, to a member protruding from the cup, to the cup, or to the rim 11. A movable contact 21 is attached to the bimetal end opposite to the end 20 serving as the attachment portion. Installation can be done by known means.

The insulating member 3 can be formed from any known inorganic or fibrous insulator. Alternatively, it may be formed from a paper material such as cardboard. If desired, the insulating member 3 may be formed of a material impregnated with a resin which has been used in the prior art, such as a B-stage resin, which hardens after assembly of the thermostat device. When assembled, the insulating member 3 is formed with a base 30 which bears on the ridge 3 and with an upright wing 31 lying within the upright wing 12 of the cup-shaped member 1. In addition, a notch 32 is formed in this insulating member 3, and the bimetal member 2 is movable through this notch, so that the movable contact 21 is aligned with the fixed contact.

The members described above are sections similar to those used in the prior art. The feature of the present invention lies in M4, which will be explained below.

According to the invention, the lid 4 is formed from an electrically conductive material and preferably has a generally flat surface 40 in the middle. At the bottom of the lid is a button 4 made of conductive material that faces inward when assembling the thermostat device.
1 is attached to form a fixed contact as a thermostatic device. Furthermore, a terminal member 42 for clipping the lead wire extends from one end of the M4.
3 and 44 are drawn into a descending shape as shown in FIG.

The purpose of the drop molding section is to generate additional pressure in the center of the end where there is no clipping effect, so that the assembly of the device and after clipping, the lid 4, the insulating member 3, the cup-shaped base member 1 An airtight seal can be created between them. In this manner, the assembly of the present invention makes the thermostat device more leak-proof than similar devices that have been used in the past. Third
．． 4.5 As shown in Figure 5, in the case of a device that is assembled in a state,
The base or cup-shaped member 1 has an insulating member 3 on its ridge.
The lid 4 is placed on top of the cup-shaped member 1, and these three members are held together by bending the wing member 12 of the cup-shaped member 1, and the lid 4 and the insulating member 3 are clipped to the cup-shaped member l. Figures 4 and 5 show leads 50 and 51 clipped into terminals 13 and 42. A bimetallic member 2 is installed in a cup-shaped member l.

As can be seen from FIG. 6, even after clipping, the molding at the end of the lid 4 is not completely flat.

Figure 6 shows the insulating member 3 in place after clipping,
4 is a partial enlarged view of FIG. 3 showing the end 44 of the lid 4; FIG. It can be seen that the edges 60 and 61 of the end portion 44 are slightly raised above the flat portion of the insulating member 3. This helps maintain additional pressure on the insulating member and thus on the ends of the ridges 11 of the sole 1.

It is clear that this pressure is exerted by the spring force generated by the edge of the lid when the clip is made against the edge. It is also clear that the insulating member 3 lies substantially flat against the ridge 11.

As is clear from Figures 1 and 3, preferably the lid is molded only at the ends. In the illustrated apparatus, the length of the lid is approximately 0.72 inches (approximately 18.3 m) as indicated by dimension a.
, the width is approximately 0.3 inches (approximately 7.5 inches) as shown in the dimensions above.
6m5). Under these conditions, the width of the molded section, as indicated by dimension C, is approximately 0.045 inches (approximately 1.1 mm). According to the dimensions mentioned above, the height of the molded part is approximately 0.008 inch (approximately 0.2 mm) as shown by dimension d in Figure 2.
It is. Obviously, the width and depth of the molding may vary as desired, depending not only on the part dimensions used, but also on the effect to be achieved. The dimensions given are merely examples of dimensions that can be fabricated.

Draw forming of the lid, as described above, is a preferred embodiment, so that the shaping is provided only at the ends of the lid. However, if desired, the entire lid may be drawn to the same effect. Furthermore, in some cases, the entire lid may not be drawn, but the drawn portion may be extended further from one or both ends toward the center than shown.

Using a thermostatic device made in accordance with the present invention, it is possible to place the thermostatic device within the windings of an electric motor or other device prior to adding an insulating face. The molding at the end of the thermostat lid provides sufficient pressure after clipping the lid and insulation to the thermostat base or cup to achieve liquid tightness even at the ends of the thermostat. be done. This pressure is sufficient to prevent intrusion of the vA edge face into the casing of the thermostatic device when the motor windings are insulated.

Although specific embodiments of the invention have been described above, the invention is not limited thereto within the scope of the appended claims.

[Brief explanation of drawings]

Figure 1 is an enlarged perspective view showing each part of the thermostat device of the present invention; Figure 2 is a front view of the end of the lid before assembly; Figure 3 is the end of the device with the parts of Figure 1 fully assembled. Front view; Figure 4 is a perspective view of the complete assembly of the thermostat device of the present invention; Figure 5 is a sectional view taken along line 5-5 in Figure 4; Figure 6 shows the end shape of the lid after clipping. Figure b is an enlarged view of the thermostat device of the present invention. DESCRIPTION OF SYMBOLS 1... Cup-shaped member (cup-shaped base), 2... Bimetal element, 3... Insulating member, 4... M (M
member), 10...cup (indentation), 11...
- Rim, 12, 31... (upright) wing, 43, 44... descending part, 50, 51...
Lead. Below margin F/G, 3

Claims (1)

[Scope of Claims] 1. A cup-shaped base having a ridge formed around the opening of the cup, and an insulating member disposed against the ridge of the base;
A thermostat device having a lid placed on the insulating member, the thermostat device having a means for collectively clipping the base, the insulating member, and the lid to the ribbed edge, the lid having a descending part. , a thermostat device characterized in that the center of the descending part is pressed against the insulating member before the base, the insulating member, and the lid are all clipped together. 2. The thermostat device according to claim 1, wherein the descending portions are formed at both ends of the lid. 3. a. a base having a recessed portion formed therein, a ridge surrounding the recessed portion, and wings attached to opposite sides of the ridge; and b. a base located within the recessed portion; a bimetallic element having a movable contact at one end of which the movable contact moves upwardly toward the fixed contact when the element bends; c. a first portion supported by a ridge of the base; , two upright wings formed on opposite sides of the first portion and supported within the wings of the base, with an opening in the center thereof allowing actuation of the bimetallic element. an insulating member: and d. a lid member supported on the first portion of the insulating member and clipped to the ridge of the base via the insulating member by acting on the two wings of the base; The base and the lid member are divided by an insulating member, the lid member has a descending portion, the descending portion has a center portion and an edge, and at least the center portion of the descending portion is pressed against the ridge with pressure; A thermostat device having. 4. The thermostat device according to claim 3, wherein the descending portions are formed at both ends of the lid.