Patent ID: 8113586
Filing Date: 2012-02-14
Classification: A47C

Abstract:
1. An apparatus for adjusting a seat back angle of a seat back, and more particularly an adjuster inclinedly disposed at a lower position of a bottom of the seat back and a rear side of a seat portion, comprising: a) a rotating sleeve having an opening at a rotating sleeve front end thereof such that a cavity is created, a primary threaded hole being positioned in an axial direction relative to the rotating sleeve at a coaxial center of a bottom of the cavity; b) an L-shaped connection body having a threaded rod at a lateral side thereof, the threaded rod being screwed into the primary threaded hole of the rotating sleeve, the threaded rod of the connection body having a primary through hole extended in the axial direction relative to the rotating sleeve, the L-shaped connection body having a first pivoted portion at a longitudinal side thereof, a radial hole being formed in the connection portion between the longitudinal side of the connection body and the threaded rod, the radial hole being formed to extend to the primary through hole; c) a large spring having a tail portion fitting into the cavity of the rotating sleeve; d) a shift shaft having a second pivoted portion at a shift shaft front end thereof, the second pivoted portion having a first external diameter and a pivotal hole through the second pivoted portion, a first stem having a smaller second external diameter than the first external diameter of the second pivoted portion and the first stem being positioned at an internal side of the second pivoted portion, a second stem having a smaller third diameter than the second diameter of the first stem and being disposed at an internal side of the first stem and fitting into the primary through hole of the threaded rod, an end stop having an external diameter greater than the primary through hole being formed at a connection area between the first stem and the second stem, a tail of the shift shaft passing through the large spring and the primary through hole first whereupon a positioning element at the end of the shift shaft is employed to fix the shift shaft within the connection body in such a manner that the shift shaft is axially movable and the large spring is confined between the second pivoted portion and the cavity, the second stem being provided with a plurality of pin holes corresponding to the radial hole of the connection body; and e) a locking device mounted on the radial hole of the L-shaped connection body, an insertion pin at an end of the locking device fitting in the radial hole and being extended into at least one of the prearranged pin holes of the second stem such that the shift shaft is locked in an unmovable state, the locking device further having a control lever; wherein, when the insertion pin is removed with the control lever, the shift shaft is unlocked in an axially movable state relative to the locking device, and wherein the compression state of the large spring is adjustable by a clockwise and counter-clockwise rotation of the rotating sleeve on the threaded rod, thereby achieving a practical control of a telescopic tightness of the shift shaft.