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Title:
FASTENING DEVICE, AND FIXING STRUCTURE OF SOFT MATERIAL USING THE SAME
Document Type and Number:
Japanese Patent JP2019148330
Kind Code:
A
Abstract:
To provide a fastening device superior in fixing strength of a soft material and excessive screwing prevention function.SOLUTION: Four engagement projections 12 are formed on a seating face 10 of a countersunk head 8 of a machine screw 6. A disc 5 has a tapered cylindrical portion 14 biting into a waterproof sheet 1, and a ring-shaped pressing portion 5a for pressing the water-proof sheet 1. A straight portion 15 is formed on an inner peripheral edge of the tapered cylindrical portion 14, and the tapered cylindrical portion 14 is provided with four engagement holes 16 to which the engagement projections 12 are fitted. The engagement holes 16 are closed holes not opened, so that the tapered cylindrical portion 14 keeps high rigidity, and is improved in a pressing function of the water-proof sheet 1. As the tapered cylindrical portion 14 and the straight portion 15 bite into the water-proof sheet 1 and a heat insulation material 2, a disc 5 is stopped in a prescribed state, and the engagement projections 12 can be firmly fitted into the engagement holes 16. Accordingly, excessive screwing can be surely prevented while securing high fastening strength.SELECTED DRAWING: Figure 2

Inventors:
FUJIIE MITSUO
FUJISAWA KENICHI
Application Number:
JP2018035282A
Publication Date:
September 05, 2019
Filing Date:
February 28, 2018
Export Citation:
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Assignee:
SEKISUI HOUSE KK
JAPAN POWER FASTENING CO LTD
International Classes:
F16B39/24; F16B25/00; F16B43/00
Domestic Patent References:
JP2017129247A2017-07-27
JP2007016864A2007-01-25
JP2010105667A2010-05-13
JP2017082546A2017-05-18
Attorney, Agent or Firm:
Hiroyuki Nishi
Ryuichi Watanabe