JP2023151971A - Limit switch - Google Patents

Abstract

To provide a limit switch that can prevent idling of a lever.SOLUTION: A limit switch comprises a switch body that can switch between on and off, and an operation unit that is connected with the switch body. The operation unit includes a housing, a shaft member, a lever, and a fixing member. The shaft member has a shaft body that extends from an outside of the housing to an inside of the housing along a first direction, and is supported by the housing in a state in which the shaft body is rotatable around a rotation axis extending in the first direction from a return position to an active position. The lever is located, of both ends in the first direction of the shaft body, at one end in an outside the housing, and covers the shaft body around the rotation axis. When seen along the first direction, the fixing member penetrates the lever in a direction intersecting a direction of rotation of the shaft body and extends to the shaft body, and fixes the lever to the shaft body.SELECTED DRAWING: Figure 3

Description

The present disclosure relates to limit switches.

Patent Document 1 discloses a limit switch that includes a housing in which a built-in switch is housed, a shaft rotatably supported by the housing, and an arm provided at the tip of the shaft.

JP2015-204223A

In the limit switch, an arm is fitted into the serrations of the shaft. Therefore, for example, if the shaft and the arm have different coefficients of thermal expansion, when heat is applied to the limit switch, a gap may be formed between the shaft and the arm, and the arm may spin idle.

An object of the present disclosure is to provide a limit switch that can prevent a lever from rotating idly.

A limit switch according to one aspect of the present disclosure includes:
A switch body that can be turned on and off,
and an operation section connected to the switch body,
The operation section is
housing and
a shaft body extending from the outside of the housing to the inside of the housing along a first direction and supported by the housing in a rotatable state from a return position to an operating position about a rotation axis extending in the first direction; a shaft member having;
a lever located at one end outside the housing among both ends of the shaft body in the first direction, and covering the shaft body around the rotating shaft;
a fixing member that extends through the lever in a direction intersecting the rotational direction of the shaft body and fixes the lever to the shaft body when viewed along the first direction; include.

According to the limit switch of the above aspect, it is possible to realize a limit switch that can prevent the lever from rotating idly.

FIG. 1 is a perspective view showing a limit switch according to an embodiment of the present disclosure. FIG. 2 is a perspective view showing an operating section of the limit switch in FIG. 1; A cross-sectional view taken along the III-III line in FIG. 1. FIG. 2 is a sectional view showing a modification of the limit switch of FIG. 1;

An example of the present disclosure will be described below with reference to the accompanying drawings. The following description is merely illustrative in nature and is not intended to limit the present disclosure, applications of the present disclosure, uses of the present disclosure, etc. The drawings are schematic, and the ratio of each dimension does not necessarily match the reality.

As shown in FIG. 1, a limit switch 1 according to an embodiment of the present disclosure includes a switch body 2 that can be turned on and off, and an operating section 3 connected to the switch body 2.

The switch body 2 has a substantially rectangular parallelepiped shape, as shown in FIG. 1, for example. An operating section 3 is detachably connected to one surface of the switch body 2.

The operating section 3 includes a housing 10, a shaft member 20, a lever 30, and a fixing member 40.

As shown in FIG. 2, the housing 10 includes, for example, a hollow, substantially cubic housing body 11, and a substantially cylindrical peripheral wall portion 12. The housing body 11 is connected to the switch body 2. As shown in FIG. 1, the peripheral wall portion 12 is located on one of the side surfaces 112 that intersect with the surface 111 of the housing body 11 that faces the switch body 2. A bearing 13 that rotatably supports the shaft member 20 is located inside the peripheral wall portion 12 .

As shown in FIG. 2, the shaft member 20 has a shaft body 21 that extends from the outside of the housing 10 to the inside of the housing 10 along the first direction (for example, the X direction). The lever 30 is located at the end located outside the housing 10 among both ends of the shaft body 21 in the first direction X.

The shaft body 21 has, for example, a substantially cylindrical shape, and is supported by the housing 10 in a state where it can rotate around a rotating shaft 211, as shown in FIG. The rotating shaft 211 is located approximately at the center of the shaft body 21 when viewed along the first direction X, and extends along the first direction X.

For example, the shaft body 21 is configured to be rotatable in forward and reverse directions. In other words, as shown in FIG. 2, the shaft body 21 is configured to be rotatable around the rotating shaft 211 from the return position P1 in the direction toward the first operating position P2 (that is, in the direction of arrow A), and from the return position P1 to the direction of the first operating position P2. It is configured to be rotatable in a direction (that is, in the direction of arrow B) toward a second operating position P3 on the opposite side of the first operating position P2 with respect to the return position P1.

In FIG. 2, dotted virtual lines indicate the positional relationship between the return position P1, the first operating position P2, and the second operating position P3. When viewed along the first direction X, the virtual line of the return position P1 passes through the center of the shaft body 21 and extends along a second direction (for example, the Z direction) orthogonal to the first direction X. The virtual line of the first operating position P2 and the second operating position P3, when viewed along the first direction (for example, the Y direction).

By rotating the shaft body 21 from the return position P1 to the first operating position P2 or the second operating position P3, a plunger (not shown) located inside the operating section 3 moves along the second direction Z, The switch body 2 is turned on and off.

In this embodiment, the shaft member 20 has a plurality of accommodating portions 22 in which the fixing members 40 are respectively accommodated. The plurality of accommodating parts 22 are located around the rotating shaft 211 at intervals. Each accommodating portion 22 extends from the outer periphery of the shaft body 21 to the rotating shaft 211 along a direction intersecting the rotational direction of the shaft body 21 (for example, a radial direction with respect to the shaft body 21) when viewed along the first direction X. It extends towards. Each accommodating portion 22 is constituted by a recessed portion recessed from the outer periphery of the shaft body 21 toward the rotating shaft 211 . A thread groove (not shown) is formed on the side surface of the recess.

As shown in FIG. 1, the lever 30 has a substantially rectangular parallelepiped shape and extends in a direction intersecting the rotational direction of the shaft body 21 when viewed along the first direction X. A through hole 31 for accommodating the shaft body 21 is provided at one end of the lever 30 in the longitudinal direction. In other words, the lever 30 covers the shaft body 21 around the rotating shaft 211 . A roller 32 is provided at the other end of the lever 30 in the longitudinal direction.

As shown in FIG. 3, the fixing member 40 extends to the shaft body 21 by penetrating the lever 30 in a direction intersecting the rotational direction of the shaft body 21 when viewed along the first direction X. It is fixed to the shaft body 21. In this embodiment, the fixing member 40 is constituted by a screw including a head 41 and a shaft portion 42 . A thread (not shown) is formed on the outer periphery of the shaft portion 42, which corresponds to a thread groove formed in the housing portion of the shaft body 21.

The limit switch 1 can exhibit the following effects.

A limit switch 1 includes a switch body 2 that can be switched on and off, and an operation section 3 connected to the switch body 2. The operating section 3 includes a housing 10, a shaft member 20, a lever 30, and a fixing member 40. The shaft member 20 extends from the outside of the housing 10 to the inside of the housing 10 along the first direction, and is rotatably attached to the housing 10 from the return position P1 to each operating position about a rotating shaft 211 extending in the first direction. It has a supported shaft body 21. The lever 30 is located at one end outside the housing 10 of both ends of the shaft body 21 in the first direction, and covers the shaft body 21 around the rotating shaft 211 . The fixing member 40 passes through the lever 30 in a direction intersecting the rotational direction of the shaft body 21 when viewed along the first direction, extends to the shaft body 21, and fixes the lever 30 to the shaft body 21. That is, in the limit switch 1, since the lever 30 is mechanically fixed to the shaft body 21 by the fixing member 40, for example, the coefficient of thermal expansion is different between the shaft body 21 and the lever 30 (for example, the shaft body 21 and the lever 30 have different thermal expansion coefficients). If the main body 21 is made of stainless steel and the lever 30 is made of aluminum), the lever 30 can be prevented from rotating idly even if heat is applied to the limit switch 1.

The fixing member 40 is made of a screw. With such a configuration, the lever 30 can be more securely fixed to the shaft body 21.

The shaft member 20 extends from the outer periphery of the shaft body 21 toward the rotating shaft 211 along a direction intersecting the rotational direction of the shaft body 21 when viewed along the first direction, and the fixing member 40 is housed therein. , has a plurality of accommodating parts 22. With this configuration, the angle at which the lever 30 is fixed to the shaft member 20 can be easily adjusted.

The accommodating portion 22 is configured as a recessed portion recessed from the outer periphery of the shaft body 21 toward the rotating shaft 211 . With such a configuration, the durability of the shaft member 20 can be increased.

The limit switch 1 can also be configured as follows.

The shaft member 20 is not limited to a plurality of accommodating parts 22 as long as it has at least one accommodating part 22 . By reducing the number of accommodating portions 22, the durability of the shaft body 21 can be increased.

The end portion of the shaft body 21 to which the lever 30 is fixed can have any configuration depending on the design of the limit switch 1 and the like. For example, by enlarging the end portion of the shaft body 21 to which the lever 30 is fixed, durability can be increased and the number of accommodating portions 22 can be increased. By increasing the number of accommodating parts 22, the fixing angle of the lever 30 with respect to the shaft member 20 can be adjusted more finely.

The accommodating portion 22 is not limited to being a recess, and may be a through hole, as shown in FIG. 4, for example. In FIG. 4, each accommodating portion 22 extends toward the rotating shaft 211 along the radial direction with respect to the shaft body 21, and forms a plurality of through holes.

The fixing member 40 is not limited to a screw, but can be made of any member capable of mechanically fixing the shaft body 21 and the lever 30.

The switch body 2 can adopt any configuration that can be switched on and off by rotating the shaft body 21.

The operating section 3 may be connected to the switch body 2 in a non-detachable manner.

The peripheral wall portion 12 is not limited to being provided integrally with the housing body 11, and may be provided separately. In this case, the peripheral wall portion 12 may be made of the same material as the housing body 11, or may be made of a different material.

Various embodiments of the present disclosure have been described above with reference to the drawings, and finally, various aspects of the present disclosure will be described. Note that in the following description, reference numerals are also included as an example.

The limit switch 1 according to the first aspect of the present disclosure includes:
A switch body 2 that can be switched on and off,
and an operating section 3 connected to the switch main body,
The operation section 3 is
housing 10;
It extends from the outside of the housing 10 to the inside of the housing 10 along a first direction, and is supported by the housing 10 in a rotatable state from a return position to an operating position about a rotating shaft 211 extending in the first direction. a shaft member 20 having a shaft body 21;
a lever 30 located at one end outside the housing 10 of both ends of the shaft body 21 in the first direction, and covering the shaft body 21 around the rotating shaft 211;
When viewed along the first direction, the lever 30 is penetrated in a direction intersecting the rotational direction of the shaft body 21 and extends to the shaft body 21 to fix the lever 30 to the shaft body 21. A fixing member 40 is included.

The limit switch 1 according to the second aspect of the present disclosure includes:
The fixing member 40 is made of a screw.

The limit switch 1 according to the third aspect of the present disclosure includes:
The shaft member 20 extends from the outer periphery of the shaft body 21 toward the rotating shaft 211 along a direction intersecting the rotational direction of the shaft body 21 when viewed along the first direction, and It has at least one housing part 22 in which the member 40 is housed.

The limit switch 1 according to the fourth aspect of the present disclosure includes:
The accommodating portion 22 is constituted by a recessed portion recessed from the outer periphery of the shaft body 21 toward the rotating shaft 211 .

The limit switch 1 according to the fifth aspect of the present disclosure includes:
The shaft member 20 has a plurality of accommodating portions 22 located at intervals around the rotating shaft 211.

By appropriately combining any of the various embodiments or modifications described above, the effects of each can be achieved. In addition, combinations of embodiments, combinations of examples, or combinations of embodiments and examples are possible, and combinations of features in different embodiments or examples are also possible.

Although this disclosure has been fully described with reference to preferred embodiments and with reference to the accompanying drawings, various variations and modifications will become apparent to those skilled in the art. It is to be understood that such variations and modifications are included insofar as they do not depart from the scope of the disclosure as defined by the appended claims.

The limit switch of the present disclosure can be applied, for example, to assembly lines for automobiles and the like.

1 Limit switch 2 Switch body 3 Operation part 10 Housing 11 Housing body 12 Surrounding wall part 13 Bearing 20 Shaft member 21 Shaft body 211 Rotating shaft 22 Accommodation part 30 Lever 31 Through hole 32 Roller 40 Fixing member 41 Head 42 Shaft part

Claims (6)

A switch body that can be turned on and off,
and an operation section connected to the switch body,
The operation section is
housing and
a shaft body extending from the outside of the housing to the inside of the housing along a first direction and supported by the housing in a rotatable state from a return position to an operating position about a rotation axis extending in the first direction; a shaft member having;
a lever located at one end outside the housing among both ends of the shaft body in the first direction, and covering the shaft body around the rotating shaft;
a fixing member that extends through the lever in a direction intersecting the rotational direction of the shaft body when viewed along the first direction and extends to the shaft body to fix the lever to the shaft body; ,Limit switch. The limit switch according to claim 1, wherein the fixing member is comprised of a screw. The shaft member extends from the outer periphery of the shaft body toward the rotating shaft along a direction intersecting the rotational direction of the shaft body when viewed along the first direction, and the fixing member is housed therein. 3. A limit switch according to claim 1 or 2, comprising at least one housing. The limit switch according to claim 3, wherein the accommodating portion is constituted by a recessed portion recessed from the outer periphery of the shaft body toward the rotating shaft. The limit switch according to claim 3, wherein the shaft member has a plurality of the accommodating portions located at intervals around the rotation axis. The limit switch according to claim 4, wherein the shaft member has a plurality of the accommodating portions located at intervals around the rotation axis.

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