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Logic switch and lever thereof

A logic switch and lever technology, applied in the field of logic switches and their levers, can solve problems such as unfavorable cost control, and achieve the effects of reduced friction, reduced friction and high precision

Inactive Publication Date: 2013-11-13
HENGFENG SAITE IND SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is undoubtedly very unfavorable for cost control

Method used

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  • Logic switch and lever thereof
  • Logic switch and lever thereof
  • Logic switch and lever thereof

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Embodiment Construction

[0022] In the following detailed description of the embodiments, reference is made to the accompanying drawings that form a part hereof. The drawings show, by way of example, specific embodiments in which the invention may be practiced. The illustrated embodiments are not intended to be exhaustive of all embodiments according to the invention. It is to be understood that other embodiments may be utilized and structural or logical changes may be made without departing from the scope of the present invention. With respect to the drawings, directional terms, such as "lower," "upper," etc., are used with reference to the orientation of the drawings being described. Since components of embodiments of the invention can be implemented in a variety of orientations, these directional terms are used for purposes of description, not limitation. Accordingly, the following detailed description is not intended to be limiting, and the scope of the invention is defined by the appended claim...

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Abstract

The invention discloses a logic switch and a lever thereof. The logic switch comprises a casing, the lever rotationally connected to a pin shaft, an inductive element used for sensing characteristic variation of fluid outside the casing and loading induction torque relevant to the sensed characteristic variation of the fluid on a first part on one side of the pin shaft, an offset element used for loading pretension torque opposite to the induction torque on the first part of the lever, and a microswitch which is turned on or off by responding the variation of torque on the lever loaded on the inductive element and the offset element, wherein the lever further comprises a middle part positioned between the first part and a second part, and the middle part is provided with at least two through holes which are formed at an interval, have the centers aligned and are basically the same as the pin shaft in size to allow the pin shaft to penetrate therein. Compared with the lever of a logic switch in the prior art, the lever provided by the invention has the advantage that the condition that a long hole is processed is changed in the condition that two short holes are processed, so that processing can be easier, and the tolerance requirements on shaft-hole matching can be ensured more easily.

Description

technical field [0001] The invention relates to a logic switch and its lever. Background technique [0002] Logic switch (or called pressure logic switch) is a kind of control instrument widely used in automation control system. Logic switches are commonly used to measure the pressure or temperature of fluids such as gases or liquids. When the pressure or temperature of the measured fluid is higher or lower than the rated value, the logic switch will act accordingly to change the on-off state of the microswitch it contains, so as to achieve the purpose of automatic control. [0003] Existing logic switches are generally equipped with levers in the casing, and the levers are generally made of aluminum alloy through die-casting. The lever is also provided with a longitudinal through hole extending through its entire width at approximately the central position to rotatably cooperate with the pin shaft fixed on the housing. [0004] However, it has been found in practice that...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H35/24H01H35/26
Inventor 赵知渊
Owner HENGFENG SAITE IND SHANGHAI