Importance

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Abstract

An inserting portion of a holding case holding a sensor is inserted in a fitting hole formed in the cylindrical wall portion of the cover. The hold-down frame portion of a hold-down member pivoted to the cylindrical wall portion is used to press the base portion of the holding case against the outer peripheral face of the cylindrical wall portion. The contact area between the base portion and the cylindrical wall portion is shut with an O-ring, so that any extraneous matter such as rainwater is prevented from penetrating into the cover. Also, a pair of elastic retaining pieces are provided for a plastic material which embeds a sensor. A pair of retaining projections are provided on the outer peripheral edge of a collar portion formed in the leading end portion of a cylindrical holding portion provided for a cover. While a corrugated sheet spring is elastically compressed in between the stepped portion of the plastic material and the collar portion, the retaining projections are each made to engage with retaining holes formed in the elastic retaining pieces. An O-ring retained by the outer peripheral face of the intermediate portion of the small-diameter portion of the plastic material is used to seal up the contact area between the outer peripheral face of the small-diameter portion and the inner peripheral face of the cylindrical holding portion.

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First Claim