BALL CHAIN AND SHADE DEVICE - TACHIKAWA BLIND MFG

Title:

BALL CHAIN AND SHADE DEVICE

Document Type and Number:

WIPO Patent Application WO/2020/209355

Kind Code:

A1

Abstract:

The present invention provides a ball chain that makes it possible to provide a fail-safe function to metal ball chains.　Provided is a ball chain in which metal balls 16a are linked by a metal link shaft 16b, wherein a first end portion 17 and a second end portion 18 are coupled by a coupling part 21. The coupling part 21 comprises a first metal connector 22a provided with a first fitting protrusion 28a, a second metal connector 22b provided with a second fitting protrusion 28b, and a coupling member 23 for coupling the first metal connector 22a and the second metal connector 22b. A resin core member 31 of the coupling member 23 has a first fitting recess into which the first fitting protrusion 28a is fit and a second fitting recess 32b into which the second fitting protrusion 28b is fit. When a pulling force is applied that exceeds the pulling force during normal operation, at least the fitting protrusion 28a, 28b is dislodged from the fitting recess due to the elasticity of the resin in the resin core member 31.

Inventors:

YAMAGISHI KAZUTO (JP)
NAKAMURA HAJIME (JP)
TANAKA RYOSUKE (JP)
ASAKA TSUBASA (JP)

Application Number:

PCT/JP2020/016088

Publication Date:

October 15, 2020

Filing Date:

April 10, 2020

Export Citation:

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Assignee:

TACHIKAWA BLIND MFG (JP)

International Classes:

E06B9/326; E06B9/42; F16G13/12

Domestic Patent References:

WO2011129345A1	2011-10-20
WO2015022949A1	2015-02-19
WO2010150799A1	2010-12-29
WO2011080834A1	2011-07-07
WO2011027407A1	2011-03-10

Foreign References:

KR101370974B1	2014-03-10
JPS4835628Y1	1973-10-26
US2110201A	1938-03-08
JPH0681262U	1994-11-22
JP2000050921A	2000-02-22
JP2008002193A	2008-01-10
JPS5613387B2	1981-03-27

Other References: