Knee brace with tool less length adjuster
A knee brace which allows the same bolster pad to be used for either the right or left leg, is adjustable to compensate for the differing angle between men and women and allows individual adjustment for each patient's comfort and brace rotation for proper fit and joint alignment. These characteristics are obtained by a contoured bolster that is selectively mountable at various positions on either side of the shin cross piece depending on whether the brace is for the left or right leg, the bolster always being on the medial side of the shin to contact the flat section on the front of the shin thereby minimizing unwanted rotation of the brace. The bolster pad has a front face with a curvature matched to a curvature of an inner side of the cross piece and a flat on a rear side to contact the front of the shin.
1. In a knee brace in which at least one of a pair of femoral arms has a length adjustment mechanism, the improvement comprising said length adjustment mechanism comprising:
a slide connected to a first part of said at least one of the femoral arms, said slide having a track with pairs of detent recesses spaced along a length thereof,
a receiver connected to a second part of said at least one of the femoral arms and in which said slide is displaceable in a lengthwise direction for changing the length of said at least one of the femoral arms,
a detent element that is received in the track of the slide, said detent element having at least one pair of detents that is engageable in at least one pair of detent recesses for fixing a position of the first and second parts of said at least one of femoral arms relative to each other, and
a toggle mechanism connected to said detent element and having a locking lever with a first position in which the at least one pair of detents is locked in engagement within said at least one pair of detent recesses, and a second position releasing said at least one pair of detents for movement out of engagement with at least one pair of detent recesses for enabling adjustment of the length of said at least one of the femoral arms, said locking lever executing an over top dead center movement from said second position into said first position so as to hold the detents against inadvertent movement out of said first position,
wherein said locking lever is movable relative to said detent element and only moves said detent element in a direction toward the slide when the locking member is moved from said second position to said first position.
2. In the knee brace according to claim 1 , wherein said at least one pair of detent recesses comprises a plurality of pairs of detent recesses with which said at least one pair of detents are engageable.
3. In the knee brace according to claim 1 , further comprising a cover plate attached to the second part of said at least one of femoral arms so as to overlie said receiver in a manner forming a channel within which the slide is movable.
4. In a knee brace in which at least one of a pair of femoral arms has a length adjustment mechanism, the improvement comprising said length adjustment mechanism comprising:
a slide connected to a first part of said at least one of the femoral arms, said slide having a track with pairs of detent recesses spaced along a length thereof,
a receiver connected to a second part of said at least one of the femoral arms and in which said slide is displaceable in a lengthwise direction for changing the length of said at least one of the femoral arms,
a detent element that is received in the track of the slide, said detent element having at least one pair of detents that is engageable in at least one pair of detent recesses for fixing a position of the first and second parts of said at least one of femoral arms relative to each other, and
a toggle mechanism connected to said detent element and having a locking lever with a first position in which the at least one pair of detents is locked in engagement within said at least one pair of detent recesses, and a second position releasing said at least one pair of detents for movement out of engagement with at least one pair of detent recesses for enabling adjustment of the length of said at least one of the femoral arms, said locking lever executing an over top dead center movement from said second position into said first position so as to hold the detents against inadvertent movement out of said first position,
wherein said detent element has biasing members engageable with said slide for forcing said detents out of engagement with said detent recesses when the locking lever of the toggle mechanism is moved into said second position.
5. In the knee brace according to claim 4 , wherein said biasing members comprises spring fingers or plate-shaped members connected to said detent element.
6. In a knee brace in which at least one of a pair of femoral arms has a length adjustment mechanism, the improvement comprising said length adjustment mechanism comprising:
a slide connected to a first part of said at least one of the femoral arms, said slide having a track with pairs of detent recesses spaced along a length thereof,
a receiver connected to a second part of said at least one of the femoral arms and in which said slide is displaceable in a lengthwise direction for changing the length of said at least one of the femoral arms,
a detent element that is received in the track of the slide, said detent element having at least one pair of detents that is engageable in at least one pair of detent recesses for fixing a position of the first and second parts of said at least one of femoral arms relative to each other, and
a toggle mechanism connected to said detent element and having a locking lever with a first position in which the at least one pair of detents is locked in engagement within said at least one pair of detent recesses, and a second position releasing said at least one pair of detents for movement out of engagement with at least one pair of detent recesses for enabling adjustment of the length of said at least one of the femoral arms, said locking lever executing an over top dead center movement from said second position into said first position so as to hold the detents against inadvertent movement out of said first position,
wherein the toggle mechanism is movably connected to the detent element, the locking lever being configured to pull the detent toward the slide when the locking lever is moved from the second position to the first position.