US-12626873-B2 - Trigger switch

US12626873B2US 12626873 B2US12626873 B2US 12626873B2US-12626873-B2

Abstract

A trigger switch includes: a trigger that receives a pushing operation; a shaft member that supports the trigger on one end side thereof; and a housing in which a through hole is opened through which the other end side of the shaft member passes. The shaft member moves inside the housing due to the pushing operation on the trigger. The trigger switch includes a covering member that covers the shaft member in a circumferential direction, has its inside sealed, and is expandable and contractible in an axial direction. The covering member has one end side attached to an outer periphery of the shaft member and has the other end side attached to a periphery of the through hole of the housing.

Inventors

Takumi Fujihara
Taiki Koyama
Kazushi MAETA
Kohei Sugiyama

Assignees

OMRON CORPORATION

Dates

Publication Date: 20260512
Application Date: 20231224
Priority Date: 20230123

Claims (1)

1 . A trigger switch, comprising: a trigger, receiving a pushing operation; a shaft member, supporting the trigger on one end side thereof; a housing, in which a through hole is opened through which an other end side of the shaft member passes, in which the shaft member moves inside the housing due to the pushing operation on the trigger; and a return spring, wound around the shaft member outside the housing and energizing the shaft member in a direction opposite to a pushing direction, wherein the trigger switch further comprises a covering member that covers the shaft member in a circumferential direction, has its inside sealed, and is expandable and contractible in an axial direction; the covering member has one end side attached to an outer periphery of the shaft member and has an other end side attached to a periphery of the through hole of the housing; the covering member is attached so as to cover the return spring that is wound around the shaft member outside the housing; a fitting part is formed on an outer peripheral surface of the shaft member; the one end side of the covering member is fitted into the fitting part formed on the shaft member; and the trigger is able to be attached to and removed from the one end side of the shaft member.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application claims the priority benefit of Japan Application No. 2023-008341, filed on Jan. 23, 2023. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification. BACKGROUND Technical Field The disclosure relates to a trigger switch including a trigger that receives a pushing operation. Related Art A trigger switch used in controlling an electric tool includes, for example, a trigger that receives a pushing operation, a shaft member that supports the trigger on one end side thereof, and a housing in which a through hole is opened through which the other end side of the shaft member passes. In the trigger switch configured in this manner, the shaft member moves inside the housing due to the pushing operation on the trigger, and when the pushing operation is canceled, the shaft member returns to its original position. As the shaft member reciprocates, the trigger switch causes a breathing motion in which air pressure inside the housing changes. In the case where foreign matter such as external moisture, dust, or outside air is drawn in by the breathing motion, there is a risk of occurrence of abnormalities such as a failure in the trigger switch. To improve dustproof and waterproof properties, for example, Patent Document 1 (Japanese Patent No. 5898993) discloses a trigger switch for an electric tool, in which a bellows-shaped external packing is provided whose tip portion is engaged with a trigger and whose base end portion is locked to a case, thereby improving the dustproof and waterproof properties. However, in the trigger switch for an electric tool disclosed in Patent Document 1, since the external packing is engaged with the trigger, the engaged portion of the packing is hidden behind the trigger after the packing is assembled, thus making it difficult to inspect the engaged state. SUMMARY A trigger switch includes: a trigger, receiving a pushing operation; a shaft member, supporting the trigger on one end side thereof; and a housing, in which a through hole is opened through which the other end side of the shaft member passes. The shaft member moves inside the housing due to the pushing operation on the trigger. The trigger switch further includes a covering member that covers the shaft member in a circumferential direction, has its inside sealed, and is expandable and contractible in an axial direction. The covering member has one end side attached to an outer periphery of the shaft member and has the other end side attached to a periphery of the through hole of the housing. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic perspective view illustrating an example of an appearance of a trigger switch according to the disclosure. FIG. 2 is a schematic exploded perspective view illustrating an example of the trigger switch according to the disclosure. FIG. 3 is a schematic side view illustrating an example of the trigger switch according to the disclosure. FIG. 4 is a schematic cross-sectional view illustrating an example of a portion of the trigger switch according to the disclosure. FIG. 5 is a schematic perspective view illustrating an example of an assembly process of the trigger switch according to the disclosure. FIG. 6 is a schematic perspective view illustrating an example of the assembly process of the trigger switch according to the disclosure. FIG. 7 is a schematic perspective view illustrating an example of the assembly process of the trigger switch according to the disclosure. FIG. 8 is a schematic perspective view illustrating an example of the assembly process of the trigger switch according to the disclosure. FIG. 9 is an explanatory diagram conceptually illustrating an example of trigger replacement of the trigger switch according to the disclosure. DESCRIPTION OF THE EMBODIMENTS The disclosure provides a trigger switch in which inspection of an attached state of a covering member is easy. A trigger switch according to the disclosure includes: a trigger, receiving a pushing operation; a shaft member, supporting the trigger on one end side thereof; and a housing, in which a through hole is opened through which the other end side of the shaft member passes. The shaft member moves inside the housing due to the pushing operation on the trigger. The trigger switch further includes a covering member that covers the shaft member in a circumferential direction, has its inside sealed, and is expandable and contractible in an axial direction. The covering member has one end side attached to an outer periphery of the shaft member and has the other end side attached to a periphery of the through hole of the housing. In the trigger switch, a fitting part is formed on an outer peripheral surface of the shaft member. The one end side of the covering member is fitted into the fitting part formed on the shaft member. The trigger switch further includes a return spring that is w