Winch tightening mechanism
According to some embodiments, a winch tightening apparatus comprises a mounting plate; it first moment arm coupled to the mounting plate and configured to provide leverage for rotating the mounting plate; and a pawl comprising a first end and a second end. The first end is pivotally coupled to the mounting plate such that the second end pivots to engage a ratchet gear when the mounting plate is rotated in a first direction and pivots to disengage the ratchet gear when the mounting plate is rotated in a second direction opposite the first direction. Some embodiments include a second moment arm coupled to the mounting plate and configured to provide leverage for rotating the mounting plate. Some embodiments include a counterweight coupled to the mounting plate and positioned to rotate the mounting plate in the second direction.
1. A winch apparatus, comprising:
a winch housing;
a winch drum rotationally coupled to the winch housing by a drive shaft;
a ratchet gear coupled to the drive shaft for rotating the winch drum;
a mounting plate rotationally coupled to the drive shaft;
a first moment arm coupled to the mounting plate and configured to provide leverage for rotating the mounting plate;
a pawl comprising a first end and a second end, wherein the first end of the pawl is pivotally coupled to the mounting plate and positioned such that the second end of the pawl engages the ratchet gear via the mounting plate being rotated in a first direction and disengages the ratchet gear via the mounting plate being rotated in a second direction opposite the first direction; and
a counterweight coupled to the mounting plate, the counterweight positioned to rotate the mounting plate in the second direction to disengage the pawl from the ratchet gear and return the mounting plate and first moment arm to a rest position.
2. The winch apparatus of claim 1 , wherein the counterweight is gravity operated or spring operated.
3. The winch apparatus of claim 1 , further comprising a second moment arm coupled to the mounting plate offset from the first moment arm and configured to provide leverage for rotating the mounting plate.
4. The winch apparatus of claim 1 , further comprising a stop pin coupled to the winch housing positioned to limit the rotational motion of the mounting plate.
5. The winch apparatus of claim 1 , further comprising:
a slot in the mounting plate; and
a stop pin coupled to the winch housing and extending into the slot in the mounting plate such that the stop pin limits the rotational motion of the mounting plate.
6. The winch apparatus of claim 1 , wherein the first moment arm is detachable from the mounting plate.
7. The winch apparatus of claim 1 , wherein the first moment arm comprises a shear point.
8. A winch tightening apparatus, comprising:
a mounting plate configured to be rotationally coupled to a winch drum;
a first moment arm coupled to the mounting plate and configured to provide leverage for rotating the mounting plate;
a pawl comprising a first end and a second end, the first end pivotally coupled to the mounting plate, wherein the pawl is positioned such that the second end of the pawl engages the ratchet gear via the mounting plate being rotated in a first direction and disengages the ratchet gear via the mounting plate being rotated in a second direction opposite the first direction; and
a counterweight coupled to the mounting plate, the counterweight positioned to rotate the mounting plate in the second direction to disengage the pawl from the ratchet gear and return the mounting plate and first moment arm to a rest position.
9. The winch tightening apparatus of claim 8 , wherein the counterweight is gravity operated or spring operated.
10. The winch tightening apparatus of claim 8 , further comprising a second moment arm coupled to the mounting plate offset from the first moment arm and configured to provide leverage for rotating the mounting plate.
11. The winch tightening apparatus of claim 8 , wherein the first moment arm is detachable from the mounting plate.
12. The winch tightening apparatus of claim 8 , wherein the first moment arm comprises a shear point.
13. A method comprising:
providing a winch housing and a winch drum, the winch drum rotationally coupled to the winch housing by a drive shaft;
rotationally coupling a winch tightening apparatus to the drive shaft, the winch tightening apparatus comprising:
a mounting plate;
a first moment arm coupled to the mounting plate and configured to provide leverage for rotating the mounting plate;
a pawl comprising a first end and a second end, the first end pivotally coupled to the mounting plate, wherein the pawl is positioned such that the second end of the pawl engages a ratchet gear coupled to the drive shaft via the mounting plate being rotated in a first direction and disengages the ratchet gear via the mounting plate being rotated in a second direction opposite the first direction; and
a counterweight coupled to the mounting plate, the counterweight positioned to rotate the mounting plate in the second direction to disengage the pawl from the ratchet gear and return the mounting plate and first moment arm to a rest position.
14. The method of claim 13 , further comprising coupling a stop pin to the winch housing positioned to limit the rotational motion of the mounting plate.
15. The method of claim 13 , wherein the counterweight is gravity operated or spring operated.
16. The method of claim 13 , wherein the winch tightening apparatus further comprises a second moment arm coupled to the mounting plate offset from the first moment arm and configured to provide leverage for rotating the mounting plate.
17. The method of claim 13 , wherein the first moment arm is detachable from the mounting plate.
18. The method of claim 13 , wherein the first moment arm comprises a shear point.