Title:
EXTENSION AND CONTRACTION MECHANISM AND METHOD FOR MANUFACTURING EXTENSION AND CONTRACTION MECHANISM
Document Type and Number:
WIPO Patent Application WO/2021/065354
Kind Code:
A1
Abstract:
Provided is an extension and contraction mechanism that enables cost reduction with a convenient mechanism. An extension and contraction mechanism (10) is provided with: a shaft (32) and a back-and-forth pipe (22) disposed coaxially with respect to a reference axis line (J); a motor (28) that rotates the shaft (32); a base-end pipe (20) that holds the back-and-forth pipe (22) non-rotatably and movably back and forth along the reference axis line (J); a plurality of rollers (46) disposed in an inner cavity of the back-and-forth pipe (22); and a roller holder (44) that rotates integrally with the shaft (32) and holds a plurality of rollers (88) rotatably. Each of the plurality of rollers (46) is brought into contact with an outer peripheral face of the shaft (32), and is held by the roller holder (44) such that a central axis thereof forms an inclined angle θ with respect to the reference axis line (J). At least one of an outer peripheral face of the roller (46) and the outer peripheral face of the shaft (32) is an elastic body, and at least one thereof has been subjected to a non-slip treatment.
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Inventors:
OHASHI MICHIO (JP)
Application Number:
PCT/JP2020/033670
Publication Date:
April 08, 2021
Filing Date:
September 04, 2020
Export Citation:
Assignee:
MITSUI KINZOKU ACT CORP (JP)
International Classes:
B25J18/02; B25J19/00; F16H19/02; F16M11/28; F16M13/00
Domestic Patent References:
| WO2016185943A1 | 2016-11-24 |
Foreign References:
| JP2007010146A | 2007-01-18 | |||
| JPH08184360A | 1996-07-16 | |||
| JPH05106703A | 1993-04-27 | |||
| JPH04266314A | 1992-09-22 | |||
| JPS638238A | 1988-01-14 | |||
| JPH04203649A | 1992-07-24 |
Attorney, Agent or Firm:
SAKAI INTERNATIONAL PATENT OFFICE (JP)
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