JPH0517219U - Thumbscrew mounting structure - Google Patents

Abstract

(57) [Summary] [Purpose] The objective is to reduce the protrusion size of the thumbscrew and improve the appearance, operability, and safety. [Structure] Block 2 is provided on the back surface of housing 1 having insertion hole 4.
0 and the nut member 5 are arranged. The male screw portion 3B of the thumbscrew 3 is formed by the screw storage hole 21 of the block 20 and the insertion hole 4 of the housing 1.
A storage space 9 for storing the is formed. Screw hole 2 on panel 2
2 prevents the thumb screw 3 from coming off. A washer 23 is provided on the panel surface, and the washer 23 and the knob 3 of the thumbscrew 3
A conical coil spring 26 is provided between C. The washer 23 is provided with a spring accommodating recess 25A, the male screw portion 3B of the knob screw 3 is screwed into the nut member 5, the panel 2 is fastened and fixed to the housing 1, and the conical spring 26 is compressed into a flat plate shape to accommodate the spring. It is stored in the recess 25A.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a thumbscrew mounting structure suitable for use in cases where a panel is screwed and fixed to a housing of various electric devices.

[0002]

[Prior Art]

 Conventionally, when mounting a panel on the front surface or the back surface of an electric equipment casing, the most common method is fixing with a screw. However, when the panel is attached and detached with screws, the screws are likely to fall off the screw mounting holes in the panel, and if they fall off, there is a risk that they may be lost. Therefore, as a method of solving such a problem, the thumbscrew is attached to the panel in advance so as not to fall off, and when the panel is fastened and fixed, the thumbscrew is screwed into a screw hole or a nut provided on the housing side. Things are known.

FIG. 4 and FIG. 5 are conventional examples showing such a mounting structure of the thumbscrew, FIG. 4 is a sectional view showing a state before fastening, and FIG. 5 is a sectional view showing a state after fastening. In these drawings, reference numeral 1 denotes a housing to which the panel 2 is attached, which has an insertion hole 4 into which the male screw portion 3B of the thumb screw 3 is inserted, and a nut member 5 on the inner surface corresponds to the male screw portion 3B. Have been installed. The panel 2 fastened and fixed to the surface of the housing 1 by the thumb screw 3 has an insertion hole 6 having a hole diameter sufficiently larger than that of the male screw portion 3B, and a boss 7 is projected on one end surface of the panel surface. The thin fitting cylinder portion 7a provided is fitted and fixed in the insertion hole 6 and arranged. The knob screw 3 is composed of a columnar main body 3A, the male screw portion 3B provided at the tip of the main body 3A, and a knob portion 3C provided at the base of the main body 3A. The male screw portion 3B and the main body 3A A part of is inserted into a screw accommodating recess 8 provided on one end surface of the boss 7, and the screw accommodating recess 8 and the insertion hole 4 of the housing 1 form an accommodating space 9 for the male screw part 3B. ing. The outer diameter of the male screw portion 3B is larger than the outer diameter of the main body 3A. A spring accommodating recess 10 is provided in the other end surface of the boss 7. The spring accommodating recess 10 accommodates one end of a compression coil spring 12 for urging the thumbscrew 3 in the counter panel direction. The other end is housed and held in an annular groove 13 formed on the back surface of the knob 3C. The screw accommodating concave portion 8 and the spring accommodating concave portion 10 are communicated with each other by a screw hole 14 into which the male screw portion 3B can be screwed, thereby preventing the thumb screw 3 from falling off the boss 7. In such a configuration, when the panel 2 is fastened and fixed to the housing 1, the panel 2 is placed on the surface of the housing, and the screw housing recess 8 of the boss 7 is aligned with the insertion hole 4 of the housing 1 so as to be in close contact. The rear knob screw 3 is rotated while pressing it against the compression coil spring 12, and the male screw portion 3B is screwed into the screw hole 15 of the nut member 5 until the knob portion 3C abuts the boss 7.

[0004]

[Problems to be solved by the device]

However, in the above-mentioned conventional thumbscrew mounting structure, since the boss 7 is provided on the panel surface and the screw accommodation recess 8 and the spring accommodation recess 10 are provided in the boss 7, the length of the boss 7 is reduced. However, there is a problem in that the protruding dimensions D ₁ and D _{2 of} the thumbscrew 3 from the panel surface become large because of a long length. Therefore, the appearance of the housing 1 is not good, and the hands and clothes are easily caught during operation, carrying, etc., and there are problems in operability and safety.

Therefore, the present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to make it possible to reduce the protruding dimension of the thumbscrew, to improve the appearance, operability, Another object is to provide a thumbscrew mounting structure that improves safety and the like.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a mounting member having an insertion hole, a fixed member that is fastened and fixed to the front surface of the mounting member by a thumbscrew, and the insertion member disposed on the back surface of the mounting member. A block for accommodating the male screw portion of the thumbscrew together with the hole, a nut member arranged on the block and screwed with the male screw portion of the thumbscrew, and a spring accommodating recess are provided on the surface of the fixed member. A washer is provided and is elastically mounted between the washer and the knob portion of the knob screw to urge the knob screw in a direction projecting from the insertion hole, and by the knob portion when the fixed member is fastened. The conical coil spring is housed in the spring housing recess by being compressed into a flat plate shape.

[0007]

[Action]

 In the present invention, the conical coil spring is compressed into a flat plate shape when the fixed member is fastened and is housed in the spring housing recess of the washer. The block is provided on the back side of the mounting member and forms a storage space for the male screw portion of the thumbscrew.

[0008]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. FIG. 1 is a sectional view showing an embodiment of a mounting structure of a thumb screw according to the present invention before fastening, FIG. 2 is a sectional view showing a state after fastening, and FIGS. 3 (a) and 3 (b) are casings. FIG. 3 is a front view and a main part plan view of FIG. The same components as those in FIGS. 4 and 5 are designated by the same reference numerals, and the description thereof will be omitted. In these figures, a block 20 and a nut member 5 are arranged on the back surface of the housing (mounting member) 1. A screw accommodating hole 21 is formed in the center of the block 20 so as to form an accommodating space 9 for accommodating the male screw portion 3B of the thumbscrew 3 together with the insertion hole 4 of the housing 1.

The panel (fixed member) 2 has a screw 22 into which the male screw part 3 B of the thumbscrew 3 is screwed and penetrated, thereby preventing the thumbscrew 3 from falling off the panel 2. A washer 23 having a relatively small thickness is arranged on the surface of the panel 2. The washer 23 is provided with a central hole 24 through which the main body 3A of the thumbscrew 3 penetrates and a stepped recess 25 formed on the side opposite to the panel so as to communicate with the central hole 24. The small-diameter concave portion of the stepped concave portion 25 is a spring accommodating concave portion 25A, and the large-diameter concave portion is a accommodating portion 25B for accommodating a part of the knob portion 3C of the knob screw 3 at the time of fastening. The spring 26 for urging the knob screw 3 toward the counter panel side is composed of a conical coil spring, and the large-diameter side end thereof is housed in the spring housing recess 25A of the washer 23, and the small-diameter side end is the knob. It is pressed against the back surface of part 3C. The depth of the spring accommodating recess 25A is substantially equal to the wire diameter d of the conical coil spring 26, and the difference in outer diameter between the adjacent coil wheels 26a to 26d of the conical coil spring 26 prevents overlap during compression. It is set to be approximately equal to or slightly larger than 2d. Therefore, when the knob screw 3 is pushed in, the male screw portion 3B is screwed into the screw hole 15 of the nut member 5, and the panel 2 is fastened and fixed to the housing 1, the conical coil spring 26 becomes substantially flat, that is, each wire. The wheels 26a to 26d are compressed so as to be located on the same plane and housed in the spring housing recess 25A.

Thus, in the thumbscrew mounting structure having such a configuration, the housing space 9 for the male screw portion 3B is provided on the back surface side of the housing 1, and the spring for urging the thumbscrew 3 has a conical shape. Since the coil spring 26 is configured to be compressed into a flat plate shape at the time of fastening so as to be housed in the spring housing recess 25A of the washer 23, not only at the time of fastening but also before fastening, the thumb screw 3 The protrusion dimensions D ₃ and D ₄ from the panel surface can be made smaller than those of the conventional structure shown in FIGS. 4 and 5. Therefore, the appearance is good, and it is possible to prevent the hand from being caught when the switch 30 is operated.

[0011]

[Effect of the device]

 As described above, according to the attachment structure of the thumbscrew according to the present invention, since the protrusion size of the thumbscrew can be made small, the appearance is good, and there is little risk of catching hands or clothes. The operability and safety can be improved, and its practical effect is great.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a mounting structure of a thumbscrew according to the present invention before fastening.

FIG. 2 is a cross-sectional view showing a state after fastening.

3 (a) and 3 (b) are a front view and a plan view of a main part of a housing.

FIG. 4 is a cross-sectional view showing a state before fastening of a conventional thumbscrew mounting structure.

FIG. 5 is a cross-sectional view showing a state after fastening.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 case 2 panel 3 knob screw 3A main body 3B male screw part 3C knob part 4 insertion hole 5 nut member 7 boss 9 storage space 20 block 21 screw storage hole 22 screw hole 23 washer 25 stepped recess 26 conical coil spring

Claims (1)

[Scope of utility model registration request] 1. A mounting member having an insertion hole, a fixed member which is fastened and fixed to the front surface of the mounting member by a thumbscrew, and a male screw portion of the thumbscrew provided on the back surface of the mounting member together with the insertion hole. A block for accommodating the same, a nut member disposed on the block and screwed with the male screw portion of the knob screw, a washer disposed on the surface of the fixed member having a spring accommodating recess, and the washer And the knob screw is urged in a direction projecting from the insertion hole by being elastically mounted between the knob portions, and is compressed into a flat plate shape by the knob portion when the fixed member is fastened. A conical coil spring housed in a spring housing recess, and a mounting structure for a thumb screw.