Rotation locking device for T-bolt
A T-bolt locking device provides positive engagement of a T-bolt with a track as well as prevents disengagement from the track when loosening the T-bolt sufficiently to allow movement of an accessory along a slot in the track to a new position. Tightening the accessory onto the T-bolt secures flanges of the head of the T-bolt against an inner surface of the track while fixing the accessory to the track. The T-bolt locking device comprises opposing tabs configured to pass through the slot in the track and receive the flanges of the head of the T-bolt, whereby the locking device is in the engaged position, preventing rotation of the head of the T-bolt in relation to the tabs. When fastening the T-bolt and locking device, if the locking device does not seat against the track surface, this indicates that the T-bolt is under-rotated and not properly engaged with the track because the opposing tabs of the locking device are contacting the upper face of the T-bolt flange. This prevents the opposing flanges of the head of the T-bolt from being received between the terminal inner surfaces of the tabs of the locking device, and thus, prevents the accessory from being tightened against the track.
1. A T-bolt in combination with a T-bolt locking device for providing positive engagement of the T-bolt with an accessory mounting track to prevent rotation of the T-bolt to prevent inadvertent disengagement of the T-bolt with an accessory mounting track, wherein the accessory mounting track comprises a slot at least partially bounded between opposing upper walls and an interior at least partially bounded between the opposing upper walls and opposing side walls, the combination comprising:
the T-bolt comprising a head fixed in relation to a threaded shaft, and
the T-bolt locking device comprising a structure having a through hole for receiving the threaded shaft of the T-bolt therethrough and nodules on opposing sides of the through hole and extending in an axial direction with respect to the structure, the nodules being dimensioned to enter the slot of the accessory mounting track and being spaced to receive the head of the T-bolt therebetween, the nodules further having a length sufficient to pass through the slot and enter the interior of the accessory mounting track to prevent rotation of the head of the T-bolt,
wherein the structure comprises a track interface surface that is configured to engage an upper surface of the opposing upper walls of a track and an accessory interface surface that is configured to engage a lower surface of an accessory,
wherein the accessory interface surface is provided with a frictional feature that cooperates with the lower surface of an accessory, and
wherein the frictional features deform under stress upon tightening an accessory toward the track to increase frictional contact between the accessory interface surface and the lower surface of the accessory.
2. The combination of claim 1 , wherein the nodules have a T-bolt alignment surface facing in a direction proximate the through hole, the T-bolt alignment surfaces being approximately parallel with one another and cooperate to form an opening that is greater than a width of the head of the T-bolt.
3. The combination of claim 2 , wherein the T-bolt alignment surfaces are angled and function as stop surfaces, which are configured to engage parallel sides of the head of the T-bolt to prevent rotation of the T-bolt in both clockwise and counter-clockwise directions.
4. The combination of claim 3 , wherein the T-bolt alignment surfaces are angled at some angle so that rotation of the head of the T-bolt is limited to an angle less than 90 degrees relative to the side walls of the track, and the T-bolt alignment surfaces are approximately aligned with the rotated angle of the head of the T-bolt to thereby capture and retain the T-bolt.
5. The T-bolt locking device of claim 1 , further configured to hold the T-bolt in an orientation across the accessory mounting track so the head of the T-bolt cannot be removed without sufficiently retracting the nodules from the slot of the accessory mounting track.
6. The combination of claim 1 , wherein the structure is a generally disc-shaped structure.
7. The combination of claim 1 , wherein the generally disc-shaped structure is a structure with a shape that is generally round and generally planar.
8. The combination of claim 1 , wherein the structure is formed of a material selected from a group of materials comprising plastic, polymer, metal, or a combination thereof.
9. The combination of claim 1 , wherein the through hole is a generally square-shaped through hole.
10. The combination of claim 1 , wherein the interface surfaces are substantially planar surfaces.
11. The combination of claim 1 , wherein the frictional feature is comprised of radially extending raised and lowered surfaces defining teeth emanating from a point proximate the through hole toward an outer perimeter of the structure.
12. The combination of claim 11 , wherein the teeth provide interlocking contacts between the accessory interface surface of the structure and the mounting interface surface.
13. The combination of claim 1 , wherein the T-bolt locking device is integral with the T-bolt.
14. A T-bolt in combination with a T-bolt locking device for providing positive engagement of the T-bolt with an accessory mounting track to prevent rotation of the T-bolt to prevent inadvertent disengagement of the T-bolt with an accessory mounting track, wherein the accessory mounting track comprises a slot at least partially bounded between opposing upper walls and an interior at least partially bounded between the opposing upper walls and opposing side walls, the combination comprising:
the T-bolt comprising a head fixed in relation to a threaded shaft, and
the T-bolt locking device comprising a structure having a through hole for receiving the threaded shaft of the T-bolt therethrough and nodules on opposing sides of the through hole and extending in an axial direction with respect to the structure, the nodules being dimensioned to enter the slot of the accessory mounting track and being spaced to receive the head of the T-bolt therebetween, the nodules further having a length sufficient to pass through the slot and enter the interior of the accessory mounting track to prevent rotation of the head of the T-bolt,
wherein the structure comprises a track interface surface that is configured to engage an upper surface of the opposing upper walls of a track and an accessory interface surface that is configured to engage a lower surface of an accessory,
wherein the accessory interface surface is provided with a frictional feature that cooperates with the lower surface of an accessory,
wherein the frictional feature is comprised of radially extending raised and lowered surfaces defining teeth emanating from a point proximate the through hole toward an outer perimeter of the structure, and
wherein the teeth provide incremental adjustment of the accessory in relation to the structure, at discrete positions.
15. A T-bolt in combination with a T-bolt locking device for providing positive engagement of the T-bolt with an accessory mounting track to prevent rotation of the T-bolt to prevent inadvertent disengagement of the T-bolt with an accessory mounting track, wherein the accessory mounting track comprises a slot at least partially bounded between opposing upper walls and an interior at least partially bounded between the opposing upper walls and opposing side walls, the combination comprising:
the T-bolt comprising a head fixed in relation to a threaded shaft, and
the T-bolt locking device comprising a structure having a through hole for receiving the threaded shaft of the T-bolt therethrough and nodules on opposing sides of the through hole and extending in an axial direction with respect to the structure, the nodules being dimensioned to enter the slot of the accessory mounting track and being spaced to receive the head of the T-bolt therebetween, the nodules further having a length sufficient to pass through the slot and enter the interior of the accessory mounting track to prevent rotation of the head of the T-bolt,
wherein the structure comprises a track interface surface that is configured to engage an upper surface of the opposing upper walls of a track and an accessory interface surface that is configured to engage a lower surface of an accessory,
wherein the nodules have a T-bolt alignment surface facing in a direction proximate the through hole, the T-bolt alignment surfaces being approximately parallel with one another and cooperate to form an opening that is greater than a width of the head of the T-bolt,
wherein the T-bolt alignment surfaces are angled and function as stop surfaces, which are configured to engage parallel sides of the head of the T-bolt to prevent rotation of the T-bolt in both clockwise and counter-clockwise directions,
wherein the T-bolt alignment surfaces are angled at some angle so that rotation of the head of the T-bolt is limited to an angle less than 90 degrees relative to the side walls of the track, and the T-bolt alignment surfaces are approximately aligned with the rotated angle of the head of the T-bolt to thereby capture and retain the T-bolt, and
wherein the angle of the T-bolt alignment surface is 35 degrees in relation to a line perpendicular to side walls of the nodules.