A work machine operation apparatus that appropriately provides an operational feeling to an operator is provided. A base includes a plurality of first holes each having a first dimension. The base includes a plurality of second holes each having a second dimension different from the first dimension. An interval at which two adjacent first holes are arranged is different from an interval at which two adjacent second holes are arranged. A contact portion is in contact with the base. The contact portion can move relatively to the base and can selectively be engaged with any one of the plurality of first holes and the plurality of second holes. A biasing portion applies to the contact portion, biasing force in a direction in which the contact portion is brought in contact with the base. Upon accepting an input operation, an operational input portion moves the contact portion relatively to the base.

A medium voltage switching pole includes: a fixed contact of a vacuum interrupter; a movable contact of the vacuum interrupter; a piston; at least one electrical contact; a first terminal; and a second terminal. The fixed contact is fixedly connected to the first terminal. The movable contact is fixedly connected to the piston. The piston moves within the second terminal along an axis. The at least one electrical contact makes an electrical connection between the piston and the second terminal. An outer surface of the piston and an inner surface of the second terminal are arranged such that: when in an open configuration the fixed contact and movable contact are separated, at least one first radial line perpendicular to the axis extends through locations of the at least one electrical contact, and a first distance along the at least one first radial line extends from the outer surface.

A portable electronic device includes a first body, a second body, a switching mechanism, a spring and a sliding mechanism. The first body includes a base and an input module slidably disposed on the base. The second body is pivoted to the base of the first body. The switching mechanism is disposed at the input module and is configured to switch an engaging relationship between the input module and the base. The spring is disposed at the base and abuts against the input module. The sliding mechanism includes a rack and a gear set engaged with the rack, wherein the rack is mounted to the input module and the gear set is slidably disposed at the base.

A portable electronic device includes a first body, a second body, a switching mechanism, a spring and a sliding mechanism. The first body includes a base and an input module slidably disposed on the base. The second body is pivoted to the base of the first body. The switching mechanism is disposed at the input module and is configured to switch an engaging relationship between the input module and the base. The spring is disposed at the base and abuts against the input module. The sliding mechanism includes a rack and a gear set engaged with the rack, wherein the rack is mounted to the input module and the gear set is slidably disposed at the base.

A control device capable of providing rotational damping through a magnetic force is provided directly at the base of an electronic product and includes a supporting member, an adjusting member, and two magnetic members. The supporting member is provided at the base. The adjusting member is rotatably provided on the supporting member. The adjusting member has a bottom portion corresponding to a switch pre-installed in the base. The adjusting member further has a head portion outside the base. The two magnetic members are provided on the supporting member and the adjusting member respectively. The two magnetic members generate a magnetic force therebetween and thereby change the rotational damping between the supporting member and the adjusting member.

A portable electronic device includes a first body, a second body, a switching mechanism, a spring and a sliding mechanism. The first body includes a base and an input module slidably disposed on the base. The second body is pivoted to the base of the first body. The switching mechanism is disposed at the input module and is configured to switch an engaging relationship between the input module and the base. The spring is disposed at the base and abuts against the input module. The sliding mechanism includes a rack and a gear set engaged with the rack, wherein the rack is mounted to the input module and the gear set is slidably disposed at the base.

A portable electronic device includes a first body, a second body, a switching mechanism, a spring and a sliding mechanism. The first body includes a base and an input module slidably disposed on the base. The second body is pivoted to the base of the first body. The switching mechanism is disposed at the input module and is configured to switch an engaging relationship between the input module and the base. The spring is disposed at the base and abuts against the input module. The sliding mechanism includes a rack and a gear set engaged with the rack, wherein the rack is mounted to the input module and the gear set is slidably disposed at the base.

A filtration system interconnection structure having a filter manifold including a sump housing and a first correlated magnet located on or connected to a portion of the manifold, and a filter cartridge including a filter media, first and second end caps sealed to the filter media, and a second, paired correlated magnet located on or connected to the filter cartridge housing body. The first and second correlated magnets are interconnected via magnetic communication upon insertion of the filter cartridge into the sump housing, and upon movement of the filter cartridge into an alignment position, the correlated magnet located on or connected to the manifold is permitted to translate as a result of the magnetic communication. The polarity profiles of the paired correlated magnets are aligned such that a repulsion force is created when the filter cartridge is inserted within the manifold sump housing.

A lever switch which is capable of preventing loud operating noise from being generated during stepwise operation of an operating lever. The lever switch has a case, a click feeling generator placed inside the case, and a switch moving body placed inside the case and rotated with respect to the case by operating the operating lever. The click feeling generator has trough portions that abut against a convex portion of the switch moving body. Click feelings are given by the convex portion of the switch moving body sequentially abutting against the trough portions in response to stepwise operations of the operating lever. The convex portion of the switch moving body is urged toward the click feeling generator. The click feeling generator and the case are placed away from each other with a space left between them in a direction in which the first case is urged.

To provide a lever switch that reduces collision sound when a switch moving body rotates while reducing the number of parts. A click feeling generator is made integrally of an elastic member and disposed inside a third case. An operation lever is operated to rotate the switch moving body with respect to the third case. The click feeling generator includes clicking surfaces that abut on a tip end of the switch moving body to impart a click feeling, a shoulder portion, and a low rigidity portion. A corner portion of the switch moving body in the rotation direction abuts on the corresponding low rigidity portion to limit a rotation range of the switch moving body.