Wheelchair seat back with two-point mounting hardware
View Patent ↗Wheelchair seat back mounting hardware permits the seat back to be mounted on various wheelchairs. The mounting hardware may be in the form of two-point mounting hardware that connects the seat back to the wheelchair and permits the seat back height to be adjusted independently of the mounting hardware location on the wheelchair.
1. A wheelchair seat back assembly comprising
a seat back and mounting hardware for mounting the wheelchair seat back in relation to wheelchair seat posts, the mounting hardware comprising
a tube clamp having inner and outer parts with flats defining a V-shaped geometry, with the inner and outer parts contacting each other at a rear end of the clamp,
the tube clamp having a swivel pin engagable with a fastener that fastens the inner and outer parts together,
the swivel pin being angularly displaceable to support the fastener at various angles in relation to the tube clamp,
the swivel pin together with the flats and V-shaped geometry permitting the tube clamp to fit wheelchair seat posts of various sizes,
wherein the clamp forms a third class lever, with the contact between the inner and outer parts forming a fulcrum at a rear end of the clamp, the front end of the clamp applying a clamp force to the wheelchair posts, and the fastener in conjunction with the swivel pin providing an axial load at a position intermediate of the rear end and front end of the clamp,
wherein the mounting hardware comprises a mounting pin configured to be mounted in relation to one of the wheelchair seat posts or the seat back and a pin receiver configured to be mounted in relation to the other one of the wheelchair seat posts or the seat back, the mounting pin being structured to be received by the pin receiver to mount the seat back in relation to the wheelchair seat posts; and
wherein the pin receiver is supported in relation to a mounting bracket by fasteners that pass through one or more slots in the mounting bracket, the fasteners mounting the pin receiver in relation to the mounting bracket, the slots being oversized to permit the pin receiver to be angularly adjustable in relation to the mounting bracket.
2. The wheelchair seat back assembly of claim 1 wherein the mounting hardware and the seat back are dimensioned and configured to permit the height of the seat back to be adjusted independently of the mounting hardware location on the wheelchair seat posts.
3. The wheelchair seat back assembly of claim 1 wherein the mounting pin and the pin receiver are conically shaped.
4. The wheelchair seat back assembly of claim 1 wherein the mounting hardware is configured to adjust the seat back to various width ranges of seat posts and also adjust in height, angle and depth.
5. A wheelchair seat back assembly comprising
a seat back and mounting hardware for mounting the wheelchair seat back in relation to wheelchair seat posts, the mounting hardware comprising
a tube clamp having inner and outer parts with flats defining a V-shaped geometry, with the inner and outer parts contacting each other at a rear end of the clamp,
the tube clamp having a swivel pin engagable with a fastener that fastens the inner and outer parts together,
the swivel pin being angularly displaceable to support the fastener at various angles in relation to the tube clamp,
the swivel pin together with the flats and V-shaped geometry permitting the tube clamp to fit wheelchair seat posts of various sizes,
wherein the clamp forms a third class lever, with the contact between the inner and outer parts forming a fulcrum at a rear end of the clamp, the front end of the clamp applying a clamp force to the wheelchair posts, and the fastener in conjunction with the swivel pin providing an axial load at a position intermediate of the rear end and front end of the clamp; and
wherein the locking lever, when pivoted to the unlocked position, is positioned in an interference relation with the mounting pin so that removal of the mounting pin from the pin receiver causes contact between the mounting pin and the locking lever, thereby pivoting the locking lever to the locked position, so that when the seat back is reattached to the wheelchair seat posts, the seat back is securely self-locked into place.
6. A wheelchair seat back assembly comprising
a seat back and mounting hardware for mounting the wheelchair seat back in relation to wheelchair seat posts, the mounting hardware comprising
a mounting pin configured to be mounted in relation to one of the wheelchair seat posts or the seat back and a pin receiver configured to be mounted in relation to the other one of the wheelchair seat posts or the seat back, the mounting pin being structured to be received by the pin receiver to mount the seat back in relation to the wheelchair seat posts,
the mounting hardware further including a pivotally mounted locking lever configured to be pivoted between a locked position, in which the pin is locked in the pin receiver, and an unlocked position, in which the pin can be removed from the pin receiver, and wherein the locking lever, when pivoted to the unlocked position, is positioned in an interference relation with the mounting pin so that removal of the mounting pin from the pin receiver causes contact between the mounting pin and the locking lever, thereby pivoting the locking lever to the locked position, and
wherein when the locking lever is in the locked position, the wheelchair seat back can be re-mounted onto the wheelchair and locked in place by inserting the pin into the pin receiver, without requiring additional adjustment of the locking lever;
wherein the mounting pin has a detent configured for engagement by the locking lever, and wherein in the locked position the locking lever is biased into engagement with the detent to hold the pin in the pin receiver.
7. The wheelchair seat back assembly of claim 6 wherein the mounting pin and the pin receiver are conically shaped.
8. The wheelchair seat back assembly of claim 6 wherein the mounting hardware further comprises a tube clamp configured to be mounted to wheelchair seat posts of various sizes.
9. A wheelchair seat back assembly comprising
a seat back and mounting hardware for mounting the wheelchair seat back in relation to wheelchair seat posts, the mounting hardware comprising
a mounting pin configured to be mounted in relation to one of the wheelchair seat posts or the seat back and a pin receiver configured to be mounted in relation to the other one of the wheelchair seat posts or the seat back, the mounting pin being structured to be received by the pin receiver to mount the seat back in relation to the wheelchair seat posts,
the mounting hardware further including a pivotally mounted locking lever configured to be pivoted between a locked position, in which the pin is locked in the pin receiver, and an unlocked position, in which the pin can be removed from the pin receiver, and wherein the locking lever, when pivoted to the unlocked position, is positioned in an interference relation with the mounting pin so that removal of the mounting pin from the pin receiver causes contact between the mounting pin and the locking lever, thereby pivoting the locking lever to the locked position, and
wherein when the locking lever is in the locked position, the wheelchair seat back can be re-mounted onto the wheelchair and locked in place by inserting the pin into the pin receiver, without requiring additional adjustment of the locking lever; and
including a latch plunger movable from a first latch position, in which the latch plunger biases the locking lever toward the locked position, and a second latch position, in which the latch plunger biases the locking lever toward the unlocked position.
10. The wheelchair seat back assembly of claim 9 wherein the pin receiver has an elongated relief, and the latch plunger is mounted for engagement with the elongated relief in the pin receiver, the latch plunger being mounted with a spring to bias the latch plunger into the elongated relief, thereby holding the locking lever in either the first or second latch positions.
11. A wheelchair seat back assembly comprising
a seat back and mounting hardware for mounting the wheelchair seat back in relation to wheelchair seat posts, the mounting hardware comprising
a mounting pin configured to be mounted in relation to one of the wheelchair seat posts or the seat back and a pin receiver configured to be mounted in relation to the other one of the wheelchair seat posts or the seat back, the mounting pin being structured to be received by the pin receiver to mount the seat back in relation to the wheelchair seat posts,
the mounting hardware further including a pivotally mounted locking lever configured to be pivoted between a locked position, wherein the pin is locked in the pin receiver, and an unlocked position where the pin can be removed from the pin receiver, the wheelchair seat back assembly further including a latch plunger movable from a first latch position, in which the latch plunger biases the locking lever toward the locked position, to a second latch position, in which latch plunger biases the locking lever toward the unlocked position
wherein the pin receiver is supported in relation to a mounting bracket by fasteners that pass through one or more slots in the mounting bracket, the fasteners mounting the pin receiver in relation to the mounting bracket, the slots being oversized to permit the pin receiver to be angularly adjustable in relation to the mounting bracket.
12. The wheelchair seat back assembly of claim 11 wherein the pin receiver has an elongated relief, and the latch plunger is mounted for engagement with the elongated relief in the pin receiver, the latch plunger being mounted with a spring to bias the latch plunger into the elongated relief, thereby holding the locking lever in either the first or second latch positions.
13. A wheelchair seat back assembly comprising
a seat back and mounting hardware for mounting the wheelchair seat back in relation to wheelchair seat posts, the mounting hardware comprising
a mounting pin configured to be mounted in relation to one of the wheelchair seat posts or the seat back, and a pin receiver configured to be mounted in relation to the other one of the wheelchair seat posts or the seat back, the mounting pin being structured to be received by the pin receiver to mount the seat back in relation to the wheelchair seat posts, wherein the mounting pin and the pin receiver are conically shaped
wherein the pin receiver is supported in relation to a mounting bracket by fasteners that pass through one or more slots in the mounting bracket, the fasteners mounting the pin receiver in relation to the mounting bracket, the slots being oversized to permit the pin receiver to be angularly adjustable in relation to the mounting bracket.
14. A wheelchair seat back assembly comprising
a seat back and mounting hardware for mounting the wheelchair seat back in relation to wheelchair seat posts, the mounting hardware comprising
a mounting pin configured to be mounted in relation to one of the wheelchair seat posts or the seat back and a pin receiver configured to be mounted in relation to the other one of the wheelchair seat posts or the seat back, the mounting pin being structured to be received by the pin receiver to mount the seat back in relation to the wheelchair seat posts,
the mounting hardware further including a pivotally mounted locking lever configured to be pivoted between a locked position, in which the pin is locked in the pin receiver, and an unlocked position, in which the pin can be removed from the pin receiver, and wherein the locking lever, when pivoted to the unlocked position, is positioned in a relation with the mounting pin so that removal of the mounting pin from the pin receiver results in a pivoting of the locking lever to the locked position, and
wherein when the locking lever is in the locked position, the wheelchair seat back can be re-mounted onto the wheelchair and locked in place by inserting the pin into the pin receiver, without requiring additional adjustment of the locking lever to achieve the locked position.
15. The wheelchair of claim 14 in which the mounting pin and the pin receiver are conically shaped.