Chairs and seats – Back movement resiliently opposed in operating position – Back and bottom adjust in a fixed relationship
Patent
1998-09-08
2000-03-07
Brown, Peter R.
Chairs and seats
Back movement resiliently opposed in operating position
Back and bottom adjust in a fixed relationship
2973027, 297328, A47C 1024
Patent
active
060330201
ABSTRACT:
A rocking apparatus has a supported member and a supporting member. The supported member rotatably supported on the supporting member at two distant points on a rotary shaft. The rotary shaft is provided with a reaction force imparting member, which is constantly pushed toward its initial position by a reaction force imparting mechanism, so as to be capable of oscillation. A strut is provided between the reaction force imparting member and the supported member, and the supported member is supported on the reaction force imparting member and the rotary shaft by the three-point support using the connecting members and the strut. Further, a lock mechanism consisting of the locked member having engagement grooves, the lock member fitted in or removed from the engagement groove and a impetus giving member to transmit movement of the operating means to the lock member and elastically give an impetus at least in the direction for removing the lock member from the engagement groove is provided between the supported member and the supporting member, friction between the lock member and the locked member is used to prevent the lock member from coming off when the lock member is tried to be removed from the engagement groove and no load is being applied on the supported member, and the locked state is cancelled by using accumulated spring force to remove the lock member from the engagement groove at the same time when a load is applied on the supported member.
REFERENCES:
patent: 3434756 (1969-03-01), Walkinshaw
patent: 4832402 (1989-05-01), Zund
patent: 4858993 (1989-08-01), Steinmann
patent: 4889384 (1989-12-01), Sulzer
patent: 4892354 (1990-01-01), Esthowski et al.
patent: 4948198 (1990-08-01), Crossman et al.
patent: 5207479 (1993-05-01), Wickman et al.
Brown Peter R.
Takano Co., Ltd.
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