Limit switch and method for producing same

Patent metadata

Field	Value
Publication number	US-9941063-B2
Application number	US-201214368817-A
Country	US
Kind code	B2
Filing date	Mar 15, 2012
Priority date	Jan 13, 2012
Publication date	Apr 10, 2018
Grant date	Apr 10, 2018

Abstract

A limit switch having a housing having a box, an attachment hold made in a side surface of the box, having a cylindrical bearing section, a rotating shaft rotatably inserted through the cylindrical bearing section, a cam unit provided in a leading end portion of the rotating shaft, and an operation lever provided in the other end portion of the rotating shaft. Rotational action of the operation lever is converted into vertical action by the cam unit in the box. A contact of a switch main body accommodated in and fixed to the housing is opened and closed. An outer diameter of the cam unit is smaller than an inner diameter of the attachment hole.

First claim

The invention claimed is:

1. A limit switch comprising:
a housing comprising a box;
an attachment hole made in a side surface of the box, having a cylindrical bearing section;
a rotating shaft rotatably inserted through the cylindrical bearing section;
a cam unit provided in a leading end portion of the rotating shaft; and
an operation lever provided in another end portion of the rotating shaft,
wherein rotational action of the operation lever is converted into vertical action by the cam unit in the box,
wherein a contact of a switch main body accommodated in and fixed to the housing is opened and closed, and
wherein an outer diameter of the cam unit is smaller than an inner diameter of the attachment hole.

2. The limit switch according to claim 1 , wherein the outer diameter of the cam unit is larger than an inner diameter of the cylindrical bearing section.

3. The limit switch according to claim 2 , wherein the cam unit comprises a pair of circular cams and a return spring sandwiched between the circular cams.

4. The limit switch according to claim 1 , wherein the cam unit comprises a pair of circular cams and a return spring sandwiched between the circular cams.

5. A producing method of a limit switch comprising:
rotatably inserting a rotating shaft through a cylindrical bearing section in an attachment hole made in a side surface of a box partially constituting a housing,
disposing a cam unit in a leading end portion of the rotating shaft;
disposing an operation lever in another end portion of the rotating shaft;
wherein rotational action of the operation lever is converted into vertical action by the cam unit in the box,
wherein a contact of a switch main body accommodated in and fixed to the housing is opened and closed, and
wherein the producing method further comprises:
fitting the cylindrical bearing section in the attachment hole to rotatably support the rotating shaft after the rotating shaft in which the cam unit is provided in the leading end portion is inserted in the attachment hole.

Assignees

• Takahashi Manabu
• Tsukimori Kazuyuki
• Fukui Shigenobu
• Moriyama Hiroyuki
• Ishikawa Yuichi
• Omron Tateisi Electronics Co

Inventors

• Takahashi Manabu
• Tsukimori Kazuyuki
• Fukui Shigenobu
• Moriyama Hiroyuki
• Ishikawa Yuichi

Classifications

• H01H3/42 Primary

  using cam or eccentric · CPC title

• H01H21/285

  having an operating arm actuated by the movement of the body and mounted on an axis converting its rotating movement into a rectilinear switch activating movement · CPC title

• Y10T29/49105

  Switch making · CPC title

• H01H2235/01

  Spiral spring · CPC title

• H01H11/00

  Apparatus or processes specially adapted for the manufacture of electric switches (processes specially adapted for manufacture of rectilinearly movable switches having a plurality of operating members associated with different sets of contacts, e.g. keyboards, H01H13/88) · CPC title