Chairs and seats – Back movement resiliently opposed in operating position – Constantly oriented during up-and-down movement
Patent
1981-11-18
1984-03-27
McCall, James T.
Chairs and seats
Back movement resiliently opposed in operating position
Constantly oriented during up-and-down movement
297301, 297302, 248608, A47C 300
Patent
active
044389787
ABSTRACT:
The subject invention relates to a tilt back mechanism for resiliently controlling the rearward motion of a chair. More particularly, the subject mechanism includes a planar yoke having upstanding braces formed on the side edges thereof. A rocker plate is received between the braces of the yoke and is pivotally connected thereto enabling the rocker plate to tilt relative to the yoke. A longitudinally extending torsion bar is provided with the front end thereof being fixably mounted adjacent the front end of the rocker plate. The rear end of the torsion bar is supported for rotational movement adjacent the rear end of the rocker plate. A lever arm is fixably connected to the rear end of the torsion bar and extends to one side edge of the yoke in an abutting relationship with a stop member. By this arrangement, the tilting of the rocker plate in the rearward direction causes a rotational torque to be placed on the torsion bar through the rotation of the lever arm such that the tilt back motion is torsionally restricted thereby. In the preferred embodiment of the subject invention, a load arm is provided for pretensioning the torsion bar to facilitate adjustment of the mechanism to conform to the weight of the user.
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Brown Peter
McCall James T.
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