Chairs and seats – Movable bottom – Bottom and back movable as a unit
Reexamination Certificate
1999-10-19
2001-03-06
Nelson, Jr., Milton (Department: 3636)
Chairs and seats
Movable bottom
Bottom and back movable as a unit
C297S344100
Reexamination Certificate
active
06196630
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to horizontal swiveling angle positioning means for a chair, and more particularly, the horizontal swivelling angle positioning means for a motor driven wheelchair for disabled people.
2. Brief Description of the Prior Art
A motor driven wheelchair for disabled people or a common round chair or an armchair for the office or the family use often needs to be able to adjust its horizontal swivelling angle. However, a conventional swivel chair usually has no means to be positioned in the direction after it has been turned thereat. As for a conventional motor driven wheelchair, the horizontal swiveling positioning is simply carried out by a set screw tightened between an axle seat (or axle bush) and an axle. Positioning procedure is performed by at first slackening the set screw; swivelling the horizontal angle of the wheelchair to a predetermined direction; and then tightening the set screw. However, there are disadvantages that a tool, for example, at least a driver is required for the work that is particularly embarrassing to an aged person or a disabled one (perhaps he/she is unable to do). Besides, the rider must stand up from the wheelchair during a third person is working for him/her. In the case the swivelling angle is to be recovered to the original position, the above mentioned tedious work has to be repeated.
Besides, the work has to be done in a quite narrow working space, and the set screw is not so reliable because it is easy for it to become loose gradually caused by continuous vibration of the moving wheelchair.
In order to solve the above described problems, the applicant has carried out theoretical studies and practical experients for a long time for the present invention.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a horizontal swivelling angle positioning device for a chair which an user can conveniently and rapidly swivel the chair to a predetermined horizontal angle and position thereat without the fear of slackening.
It is another object of the present invention to a provide horizontal swivelling angle positioning device for a chair which can be positioned in the predetermined horizontal angle by simply operating a control lever whose mounted direction can be easily changed at random by the user according to his/her physical condition (a normal right-hander, a left-hander, or a one armed person). The construction is fully in compliance with human body engineering that even a disabled person can operate the control lever so easily and force savingly.
It is still another object of the present invention to a provide horizontal swivelling angle positioning device for a chair which can be tightly and reliably fixed at the adjusted position without the fear of loosening from forgetting to tight the set screw or slackening due to vibration that is likely to happen in the case a set screw is employed as tightening means.
To achieve the above mentioned object, the present invention to provide provides a horizontal swivelling angle positioning means for a chair which comprises an axle bush with a positioning ring having a plurality of positioning slots formed radially thereof being attached to a main frame of the chair. An axle is inserted in the axle bush and sustained thereon so as to integrally engage the main frame and the chair seat. A control lever is provided to interconnect two flanks formed on the axle and sandwiches a filler block therebetween. The filler block is further locked to the control lever by a set screw so that the two compoments are integrally combined to turn together. A spring disposed between a stationary substrate of the chair seat and a protruded tooth of the filler block. The protruded tooth is used to be inserted into one of the positioning slots and biased thereof by the spring so as to keep the chair in a predetermined horizontal swivelling angle. According to particular requirement of the user, the control lever may be removed to and set at a desired direction after detaching the set screw. The operation can be performed by the user who sits in a wheelchair by slightly bending down his/her head to turn the control lever without leaving the wheelchair.
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patent: 4518139 (1985-05-01), Barfell
patent: 4520893 (1985-06-01), Keough
patent: 1448864 (1966-07-01), None
Chan Raymond Y.
David and Raymond Patent Group
Jr. Milton Nelson
Merits Health Products Co., Ltd.
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