Adjustable back rest

Claim 2

A back rest comprising a relatively rigid frame having a front and back, lower end and central portion, a horizontal base plate secured to the lower end of the frame, a vertical track secured at its lower end to the base plate and connected to the central portion of the frame, a guide mounted on and movable up and down on the track, said guide being a vertically elongated member made of spring steel and with at least one of its ends mounted in the track and its central portion being spaced forwardly from the track, a horizontally extending lumbar support disposed in front of the frame and carried by the central portion of the guide and movable up and down with the guide, adjusting means carried on the track for moving the central portion of the guide toward and away from the track so as to adjust the distance of the lumbar support from the front of the frame, said adjusting means being connected to the central portion of the guide so as to move that portion and the lumbar support toward and away from the front of the frame, cushioning means covering the front of the frame and lumbar support, and a cover fabric enclosing the frame, lumbar support, track and guide.

Claim 3

A back rest as defined in claim 1 further characterized by said guide engaging the track and remaining in any position in which it is placed with respect thereto by the frictional contact between them.

Claim 4

A back rest as defined in claim 1 further characterized by said track being U-shaped in cross-section and open to the front, said track having a base and side flanges, an elongated vertical slot through the base, a slide including a pair of plates, one on the front and one on the back of the base, and a screw extending through the pair of plates and slot in the base and engaging the guide to move it toward and away from the track, said slide and screw comprising said adjusting means.

Claim 5

A back rest comprising a frame having a front surface; a vertical track carried on the frame, said track being a U-shaped channel open to the front surface of the frame, said track having a base and side flanges and including an elongated vertical slot through the base; lumbar support means including a pad carried on and movable up and down on the track, said lumbar support means including a guide made of spring steel having at least one end which extends into and slides in the channel and a central portion which supports the pad, the central portion being spaced from and movable toward and away from the track; and adjusting means connected to the lumbar support means for moving it generally horizontally toward and away from the front surface of the frame to vary the forward projection of the lumbar support from the front surface of the frame, said adjusting means having a slide including a pair of plates, one on the front and one on the back of the track base, and a screw extending through the pair of plates and the slot in the base and engaging the guide to move it toward and away from the track, said screw being provided with a flange sandwiched between the plates so that the screw turns without moving axially with respect to the track.

Claim 6

A back rest comprising a frame having a front surface; a vertical track carried on the frame, said track being a U-shaped channel open to the front surface of the frame, said track having a base and side flanges and including an elongated vertical slot through the base; lumbar support means including a pad carried on and movable up and down on the track, said lumbar support means including a guide made of spring steel having at least one end which extends into and slides in the channel and a central portion which supports the pad, the central portion being spaced from and movable toward and away from the track; and adjusting means connected to the lumbar support means for moving it generally horizontally toward and away from the front surface of the frame to vary the forward projection of the lumbar support from the front surface of the frame, said adjusting means having a slide including a pair of plates, one on the front and one on the back of the track base, and a screw extending through the pair of plates and the slot in the base and engaging the guide to move it toward and away from the track, said screw being provided with a flange sandwiched between the plates so that the screw turns without moving axially with respect to the track.