초록 ▼

Changes in the vertical inclination of a lumbar support plate pivotally mounted within a backrest cause different portions of the convex surface of the support plate to contact the back of the lumbar region of the backrest, vertically altering the site of support afforded by the plate. A cable trans

Changes in the vertical inclination of a lumbar support plate pivotally mounted within a backrest cause different portions of the convex surface of the support plate to contact the back of the lumbar region of the backrest, vertically altering the site of support afforded by the plate. A cable transmits motion of user controls mounted on the outside of the backrest into incremental or continuous rotation of a circular cam. Cam followers on the rear of the support plate translate cam rotation into changes in support plate inclination. The disclosed mechanism is employable simultaneously with controls for rendering the support plate adjustable also in the horizontal direction.

대표청구항 ▼

A lumbar support for a backrest having a lumbar portion designed to be vertically aligned with the lumbar region of a user of the backrest, said lumbar support being adjustable according to a desired adjustment setting operated by regulating means and comprising: a. a support plate having front and

A lumbar support for a backrest having a lumbar portion designed to be vertically aligned with the lumbar region of a user of the backrest, said lumbar support being adjustable according to a desired adjustment setting operated by regulating means and comprising: a. a support plate having front and rear surfaces, at least a portion of said front surface engaging the rear of said lumbar portion of said backrest to define an effective contact region, the vertical position of which on said backrest varies with the vertical inclination of said support plate; b. bracket means in fixed vertical position relative said backrest, said first bracket means pivotally supporting said support plate to permit changes in the vertical inclination of said support plate, said bracket means including a pawl rotatably connected thereto; c. a cam member disposed between said support plate and said bracket means and rotatably fixed to said bracket means and rotatable to rotate said support plate to change said vertical inclination of said support plate, said cam member having at least one ratchet tooth at the periphery thereof; d. control means for rotating said cam member by an amount determined by the regulating means to vertically align said effective contact region with said lumbar region of a user said control means also including: transmission means connected to the regulating means for producing an activating force; means connected between said transmission means and said pawl for rotating said pawl in response to said activating force produced by said transmission means; and means for engaging said pawl and said at least one ratchet tooth to rotate said cam.