Rail mounting structure for electrical equipment

Abstract

The present invention includes: a rail (2) having an upper rail engagement portion (2b) and a lower rail engagement portion (2c) at both ends in a width direction; an electric device (1) in which an upper device engagement portion (6) and a lower device engagement portion (7) that are in the shape of a hook and face each other are provided at the top and bottom of a housing bottom surface (3a), and the upper rail engagement portion is fitted into the upper device engagement portion to be engaged therewith and the lower rail engagement portion is fitted into the lower device engagement portion to be engaged therewith; spring portions (10), (11) that are arranged in the vicinity of the upper device engagement portion of the housing bottom surface and apply a spring biasing force to the upper rail engagement portion that comes into engagement with the upper device engagement portion; and an engagement retaining means (8) for retaining the engaged state between the lower rail engagement portion and the lower device engagement portion when an impact force greater than the spring biasing force is applied to the electric device.

Description

[Technical field]

[0001] The present invention relates to a rail mounting structure for electrical equipment, for mounting electrical equipment such as molded case circuit breakers and electromagnetic contactors on a rail. [Background technology]

[0002] 2. Description of the Related Art Conventionally, a technique disclosed in Patent Document 1, for example, has been known as a rail mounting structure for an electric device. The electrical device of Patent Document 1 is attached by engaging with a first rail portion and a second rail portion provided at both ends of the rail in the width direction. A hook-shaped first engagement portion and a second engagement portion facing each other are formed on the bottom of the housing of the electrical device, and the first engagement portion engages with the first rail portion, and the second engagement portion engages with the second rail portion. A spring member is attached to the bottom surface of the housing of the electrical device, and the spring biasing force of the spring member acts on the first rail portion engaged with the first engagement portion, thereby moving the electrical device relative to the rail. This relative movement of the electrical device causes the second engagement portion to press the second rail portion, and the electrical device is attached in a state of straddling the rail. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5104827 Summary of the Invention [Problem to be solved by the invention]

[0004] However, with the structure of Patent Document 1, if a large impact force is applied to the electrical equipment in the opposite direction to the direction in which the second engagement portion presses against the second rail portion, the second engagement portion may come off the second rail, causing the electrical equipment to fall off the rail. The present invention has been made to solve these conventional problems, and its object is to provide a rail mounting structure for electrical equipment which will not fall off the rail even if an impact force is applied to the electrical equipment. [Means for solving the problem]

[0005] In order to achieve the above-mentioned object, a rail mounting structure for electrical equipment according to one embodiment of the present invention is a rail mounting structure for electrical equipment for mounting electrical equipment across a rail, and comprises a rail having upper rail engagement portions and lower rail engagement portions at both widthwise ends, an electrical equipment having hook-shaped upper equipment engagement portions and lower equipment engagement portions facing each other above and below the bottom surface of the housing, the upper rail engagement portion fittingly engages with the upper equipment engagement portion and the lower rail engagement portion fittingly engages with the lower equipment engagement portion, a spring portion arranged near the upper equipment engagement portion on the bottom surface of the housing and applying a spring force to the upper rail engagement portion engaging with the upper equipment engagement portion, and an engagement retaining means for maintaining the engaged state of the lower rail engagement portion and the lower equipment engagement portion when an impact force greater than the spring force is applied to the electrical equipment. Effect of the Invention

[0006] According to the rail mounting structure for electrical equipment of the present invention, there is no risk of the electrical equipment falling off the rail even if an impact force is applied to the electrical equipment. [Brief description of the drawings]

[0007] [Figure 1] 1 is a perspective view showing a rail mounting structure for electrical equipment according to a first embodiment of the present invention; [Diagram 2] FIG. 2 is a diagram showing a bottom surface of the electrical device according to the first embodiment. [Diagram 3] FIG. 2 is a diagram showing the electric device of the first embodiment from the left and right direction. [Figure 4] 1 is a diagram showing a main part of a rail mounting structure for an electric device according to a first embodiment. [Diagram 5] 1 is a diagram showing the rail mounting structure for electrical equipment of the first embodiment, viewed from the rail side. [Figure 6] FIG. 4 is a diagram showing a state in which a downward load is applied to the electric device in order to mount it on a rail in the first embodiment. [Figure 7]FIG. 4 is a diagram showing a state in which an electric device is rotated in order to be attached to a rail in the first embodiment. [Figure 8] 13 is a diagram showing a state in which a downward impact force acts on the electric device in the first embodiment, causing a lower rail engagement portion to come into contact with a protrusion formed on the bottom surface. FIG. [Figure 9] 5A to 5C are diagrams illustrating a state in which an electric device rotates when a downward impact force is applied in the first embodiment. [Figure 10] FIG. 11 is a diagram showing a bottom surface of an electric device according to a second embodiment of the present invention. [Figure 11] 13 is a diagram showing a main part of a rail mounting structure for an electric device according to a second embodiment. FIG. [Figure 12] 13A and 13B are diagrams illustrating a state in which a downward impact force acts on the electric device in the second embodiment, causing the electric device to rotate. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Next, an embodiment of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are given the same or similar reference numerals. However, it should be noted that the drawings are schematic, and the relationship between thickness and planar dimensions, the thickness ratio of each layer, etc., differ from the actual ones. Therefore, the specific thickness and dimensions should be determined with reference to the following description. In addition, it goes without saying that the drawings include parts with different dimensional relationships and ratios.

[0009] In addition, the embodiments shown below are merely examples of devices and methods for embodying the technical idea of ​​the present invention, and the technical idea of ​​the present invention does not specify the materials, shapes, structures, arrangements, etc. of the components to those described below. The technical idea of ​​the present invention can be modified in various ways within the technical scope defined by the claims. In addition, terms indicating directions such as "upper," "lower," "front," "rear," "left," and "right" used in the following description are used with reference to the directions in the accompanying drawings.

[0010] [First embodiment] The rail mounting structure for electric equipment according to the first embodiment of the present invention is a structure in which an electromagnetic contactor 1 is mounted across a rail 2, as shown in FIG. As shown in FIG. 1, the rail 2 comprises a flat rail main body 2a that is long in the left-right direction and extends in the up-down direction in the width direction, an upper rail engagement portion 2b that protrudes upward in an L-shape from one edge of the rail main body 2a in the width direction and extends in the longitudinal direction (left-right direction), and a lower rail engagement portion 2c that protrudes downward in an L-shape from the other edge of the rail main body 2a in the width direction and extends in the longitudinal direction.

[0011] The electromagnetic contactor 1 includes a first case 3 and a second case 4 as housings formed of insulating synthetic resin. An electromagnet and a drive lever for driving the contact portion are housed in the first case 3. Main contact terminals 5a to 5c, an auxiliary contact terminal (not shown), and coil terminals 5d and 5e of the electromagnet are fixed in the second case 4, and the contact portion including a movable contact and a fixed contact is housed inside the case.

[0012] FIG. 2 shows the bottom surface 3a of the first case 3 of the electromagnetic contactor 1 with the rail 2 removed, with a pair of upper equipment engagement portions 6 formed at the top of the bottom surface 3a and spaced apart in the left-right direction, and a pair of lower equipment engagement portions 7 provided at the bottom of the bottom surface 3a and spaced apart in the left-right direction, and a protrusion 8 formed on the bottom surface 3a above the pair of lower equipment engagement portions 7 and extending linearly in the left-right direction.

[0013] 3 shows the electromagnetic contactor 1 attached to the rail 2 from the left side, with the pair of upper device engaging portions 6 formed in a hook shape that opens downward along the bottom surface 3a while providing a gap into which the upper rail engaging portions 2b of the rail 2 fit. The pair of lower device engaging portions 7 are also formed in a hook shape that opens upward along the bottom surface 3a while providing a gap into which the lower rail engaging portions 2c of the rail 2 fit. As shown in FIG. 4, the protrusion 8 has a shape including a lower surface 8a that rises approximately perpendicularly from the bottom surface 3a on the side adjacent to the lower equipment engagement portion 7, and an inclined surface 8b that extends upward at an obtuse angle relative to the lower surface 8a.

[0014] FIG. 5 shows the electromagnetic contactor 1 attached to the rail 2 from the rear side, with a leaf spring 10 and a slider 11 attached to the top of the bottom surface 3a. The leaf spring 10 is a long member formed by stamping a metal plate having spring properties, and both ends in the longitudinal direction are supported by a pair of leaf spring supports 12a, 12b provided between a pair of upper device engagement parts 6. The slider 11 engages with the longitudinal center of the leaf spring 10 and is attached so as to be slidable up and down on the bottom surface 3a. When the electromagnetic contactor 1 is attached to the rail 2 with the upper rail engagement part 2b fitted into the pair of upper device engagement parts 6 and the lower rail engagement part 2c fitted into the pair of lower device engagement parts 7, the leaf spring 10, both ends of which are supported by the leaf spring supports 12a, 12b, elastically deforms into a convex shape facing upward. 3 and 5, the downward spring biasing force Fb of the elastically deformed leaf spring 10 is transmitted to the upper rail engagement portion 2b via the slider 11. When the spring biasing force Fb of the leaf spring 10 is transmitted to the rail 2, the electromagnetic contactor 1 moves upward relative to the rail 2, and the lower device engagement portion 7 presses the lower rail engagement portion 2c upward, so that the electromagnetic contactor 1 is attached straddling the rail 2.

[0015] Next, a method for mounting the electromagnetic contactor 1 on the rail 2 will be described with reference to FIGS. First, as shown in Fig. 6, the upper device engagement portion 6 of the electromagnetic contactor 1 is hooked onto the upper rail engagement portion 2b of the rail 2, and a downward load Fk is applied to the electromagnetic contactor 1, causing the leaf spring 10 to be largely elastically deformed into a convex shape facing upward via the slider 11 abutting against the upper rail engagement portion 2b. Then, the lower rail engagement portion 2c of the rail 2 is positioned above the lower device engagement portion 7 of the electromagnetic contactor 1.

[0016] 7, the electromagnetic contactor 1 is rotated in the direction of arrow R around the upper equipment engagement part 6 side engaged with the upper rail engagement part 2b, so that the lower rail engagement part 2c of the rail 2 abuts against the inclined surface 8b of the protrusion 8 formed on the bottom surface 3a of the electromagnetic contactor 1. As a result, the position of the opening 7a of the lower equipment engagement part 7 in the front-rear direction coincides with the lower rail engagement part 2c. Next, the downward load Fk applied to the electromagnetic contactor 1 is released. When this operation is performed, as shown in Fig. 3, the downward spring biasing force Fb of the elastically deformed leaf spring 10 acts on the rail 2 via the slider 11, and the electromagnetic contactor 1 moves upward relative to the rail 2. Then, the lower device engaging portion 7 of the electromagnetic contactor 1 presses the lower rail engaging portion 2c upward, and the electromagnetic contactor 1 is attached straddling the rail 2.

[0017] On the other hand, to remove the electromagnetic contactor 1 from the rail 2, a downward load Fk is applied to the electromagnetic contactor 1 shown in FIG. 7 to release the engagement between the lower equipment engagement portion 7 and the lower rail engagement portion 2c, and then the engagement between the upper equipment engagement portion 6 and the upper rail engagement portion 2b is released. This causes the electromagnetic contactor 1 to be removed from the rail 2. Next, the operation when a downward impact force acts on the electromagnetic contactor 1 attached to the rail 2 will be described with reference to Figures 8 and 9. The impact force Fs acting on the electromagnetic contactor 1 is a downward external force acting on the electromagnetic contactor 1 when, for example, the electromagnetic contactor 1 attached to the rail 2 is dropped, and is a force larger than the spring biasing force Fb generated by the leaf spring 10 when the electromagnetic contactor 1 shown in Figures 3 and 5 is attached to the rail 2 (Fs>Fb).

[0018] As shown in FIG. 8, when a downward impact force Fs acts on the electromagnetic contactor 1, the electromagnetic contactor 1 moves downward relative to the rail 2. As a result, the lower rail engagement portion 2c of the rail 2 tries to come out of the lower device engagement portion 7, but the upper portion of the lower rail engagement portion 2c abuts against the lower surface 8a of the protrusion 8 or a part of the inclined surface 8b, so that the lower rail engagement portion 2c does not come out of the lower device engagement portion 7. Next, as shown in FIG. 9, when the electromagnetic contactor 1 rotates in the direction of arrow M1 due to its own weight moment, the lower rail engagement portion 2c is pushed by the protrusion 8, and the tip of the lower rail engagement portion 2c engages with the opening 7a of the lower device engagement portion 7. Then, the spring biasing force Fb of the leaf spring 10 returns and acts on the rail 2, so that the electromagnetic contactor 1 moves upward relative to the rail 2, and the engagement is maintained in a state in which the lower device engagement portion 7 presses the lower rail engagement portion 2c upward.

[0019] Thus, according to the first embodiment, even if a downward impact force Fs acts on the electromagnetic contactor 1, the protrusion 8 abuts against the lower rail engaging portion 2c, and the electromagnetic contactor 1 rotates in the direction of the arrow M1 due to its own weight moment, thereby maintaining the engagement state of the lower equipment engaging portion 7 with the lower rail engaging portion 2c, and the spring biasing force Fb of the leaf spring 10 returns and acts on the rail 2, so that the lower equipment engaging portion 7 engages with the lower rail engaging portion 2c in a state in which it presses it upward. Therefore, with the structure for mounting the electromagnetic contactor 1 of the first embodiment to the rail 2, there is no risk of the electromagnetic contactor 1 falling off the rail 2 even if a large impact force Fs is applied to the electromagnetic contactor 1. In the present embodiment, only one protrusion is provided on the bottom surface of the housing so as to extend in the left-right direction, but a plurality of protrusions may be provided in the left-right direction. Also, the shape of the protrusion is not limited to that of the present embodiment.

[0020] [Second embodiment] 10 to 12 are diagrams showing a rail mounting structure for electric equipment according to a second embodiment of the present invention. Note that the same components as those in the rail mounting structure for electric equipment according to the first embodiment shown in Figs. 1 to 9 are given the same reference numerals and the description thereof will be omitted. 10, in the electromagnetic contactor 20 of the present embodiment, a groove 13 is formed in the bottom surface 3a of the first case 3, extending linearly in the left-right direction on the bottom surface 3a above a pair of lower device engaging portions 7. As shown in Fig. 11, the vertical width dimension Hm of the groove 13 is set to be larger than the vertical width dimension Hk of the lower rail engaging portion 2c of the rail 2 (Hm>Hk).

[0021] The structure for mounting the electromagnetic contactor 20 in this embodiment to the rail 2 is similar to that of the first embodiment, in that the downward spring force Fb of the elastically deformed leaf spring 10 acts on the rail 2 via the slider 11, moving the electromagnetic contactor 20 relatively upward with respect to the rail 2, causing the lower equipment engagement portion 7 of the electromagnetic contactor 20 to press against the lower rail engagement portion 2c of the rail 2, and the electromagnetic contactor 20 is mounted across the rail 2. Next, the operation when a downward impact force acts on the electromagnetic contactor 20 attached to the rail 2 will be described with reference to Fig. 12. The impact force Fs acting on the electromagnetic contactor 20 is also larger than the spring force Fb generated by the leaf spring 10 (Fs>Fb), similar to the first embodiment.

[0022] First, when a downward impact force Fs acts on the electromagnetic contactor 1, the electromagnetic contactor 1 moves downward relative to the rail 2. As a result, the lower rail engagement portion 2c of the rail 2 comes out of the lower device engagement portion 7. Next, when the electromagnetic contactor 1 rotates in the direction of the arrow M2 due to its own weight moment, the lower rail engagement portion 2c enters the groove portion 13 formed in the bottom surface 3a. Then, when the lower rail engagement portion 2c enters the groove portion 13, the spring biasing force Fb of the leaf spring 10 returns and acts on the rail 2. The spring biasing force Fb of the leaf spring 10 acts on the rail 2 and the electromagnetic contactor 1 moves upward relative to the rail 2, so that the lower rail engagement portion 2c fits into the lower device engagement portion 7, and the engagement is maintained in a state in which the lower device engagement portion 7 presses the lower rail engagement portion 2c upward.

[0023] Thus, according to the second embodiment, when a downward impact force Fs acts on the electromagnetic contactor 1, the lower rail engagement portion 2c that has come out of the lower equipment engagement portion 7 enters the groove portion 13 formed in the bottom surface 3a as the electromagnetic contactor 1 rotates in the direction of the arrow M2, and the spring biasing force Fb of the leaf spring 10 returns and acts on the rail 2, causing the lower rail engagement portion 2c that had entered the groove portion 13 to once again fit into the lower equipment engagement portion 7, and the lower equipment engagement portion 7 engages the lower rail engagement portion 2c in a state in which it presses it upward. Therefore, even in the structure for mounting the electromagnetic contactor 20 to the rail 2 in the second embodiment, there is no risk of the electromagnetic contactor 20 falling off the rail 2 even if a large impact force Fs is applied to the electromagnetic contactor 20. It should be noted that both the protrusion of the first embodiment and the groove of the second embodiment may be provided on the bottom surface of the housing. [Explanation of symbols]

[0024] 1,20 Magnetic contactor 2 Rail 2a Rail body 2b Upper rail engagement part 2c Lower rail engagement part 3 Case 1 3a Bottom (bottom of the housing) 4. Case 2 5a~5c Main contact terminal 5d, 5e Electromagnet coil terminals 6 Upper equipment engagement part 7 Lower equipment engagement part 7a opening 8 Projection (engaging and holding means) 8a Bottom side 8b Sloped surface (interference prevention part) 10 Leaf spring (spring part) 11 Slider (spring part) 12a, 12b Leaf spring support 13 Groove (engaging and holding means) Fb Spring force Fk Load Fs Impact force

Claims

1. A rail mounting structure for an electrical device in which the electrical device is mounted across a rail, comprising: a rail having an upper rail engagement portion and a lower rail engagement portion at both ends in a width direction; an electrical device provided with hook-shaped upper and lower device engaging portions facing each other on the top and bottom of a bottom surface of the housing, the upper rail engaging portion being fitted into and engaged with the upper device engaging portion, and the lower rail engaging portion being fitted into and engaged with the lower device engaging portion; a spring portion disposed near the upper device engaging portion on the bottom surface of the housing and configured to apply a spring force to the upper rail engaging portion that engages with the upper device engaging portion; an engagement holding means for holding an engaged state of the lower rail engagement portion and the lower equipment engagement portion when an impact force larger than the spring biasing force is applied to the electric equipment, The rail mounting structure for electrical equipment is characterized in that the engaging and retaining means is formed to protrude from the bottom surface of the housing, does not contact the lower rail engaging portion when the electrical equipment is attached to the rail, and is a protrusion that a part of the lower rail engaging portion abuts against when the impact force is applied to the electrical equipment, thereby preventing the lower rail engaging portion from coming out of the lower equipment engaging portion.

2. 2. The rail mounting structure for electrical equipment as described in claim 1, characterized in that the protrusion portion is provided with an interference prevention portion that prevents interference with the lower rail engagement portion when the lower rail engagement portion is engaged with the lower equipment engagement portion or when the lower rail engagement portion is disengaged from the lower equipment engagement portion.

3. A rail mounting structure for electrical equipment in which electrical equipment is mounted across a rail, comprising: a rail having an upper rail engagement portion and a lower rail engagement portion at both ends in a width direction; an electrical device provided with hook-shaped upper and lower device engaging portions facing each other on the top and bottom of a bottom surface of the housing, the upper rail engaging portion being fitted into and engaged with the upper device engaging portion, and the lower rail engaging portion being fitted into and engaged with the lower device engaging portion; a bottom surface of the housing adjacent to the upper device engagement portion; a spring portion that applies a spring force to the upper rail engagement portion that engages with the upper equipment engagement portion; an engagement holding means for holding an engaged state of the lower rail engagement portion and the lower equipment engagement portion when an impact force larger than the spring biasing force is applied to the electric equipment, A rail mounting structure for electrical equipment, characterized in that the engagement and retention means is a groove formed as a recess in the bottom surface of the housing, and when the impact force is applied to the electrical equipment, a part of the lower rail engagement portion enters into the groove, thereby preventing the lower rail engagement portion from coming out of the lower equipment engagement portion.

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