Manual tensioner for non-metallic straps
View Patent ↗A tensioner is disclosed for applying a non-metallic strap around a load. The tensioner includes a base and a lever that can pivot. A drive gear is mounted to the lever and rotates clockwise. A tension gear engages the drive gear and rotates counter-clockwise. A feed wheel is coupled to the tension gear and rotates counter-clockwise. A gripper is attached to the base. The strap is held stationary by the gripper, wrapped around the load, is fed underneath and is in contact with the feed wheel. When the lever is rotated down, the feed wheel rotates counter-clockwise. The strap is pulled toward a distal end of the tensioner and is tensioned in a clockwise direction around the load.
1. A tensioner for applying an associated non-metallic strap around an associated load, the tensioner comprising:
a base;
a lever supported by the base and configured to pivot in a clockwise direction, the lever having a distal end near a distal end of the tensioner;
a drive gear rotatively mounted to the lever and configured to rotate clockwise when the lever is rotated in the clockwise direction;
a tension gear engaging the drive gear and configured to rotate counter-clockwise when the drive gear rotates in a clockwise direction;
a feed wheel coupled to the tension gear and configured to rotate counter-clockwise when the tension gear rotates in a counter-clockwise direction;
a gripper attached to the base, wherein a portion of the associated strap is positioned on and held stationary by the gripper to form a bottom layer, a downstream portion of the associated strap being wrapped around the associated load and fed underneath the feed wheel until it overlies the bottom layer and forms a top layer that is in contact with the feed wheel, wherein, when the lever is rotated in the clockwise direction and the feed wheel rotates counter-clockwise, the top layer is pulled toward a distal end of the tensioner and the associated strap is tensioned in a clockwise direction around the associated load.
2. The tensioner of claim 1 , further comprising a gear box, the gear box including left and middle housings that are removably fastened to one another, wherein the tension gear is positioned between the left and middle housings.
3. The tensioner of claim 2 , further comprising a spring, wherein the spring is positioned on the outside of the gear box and is positioned between the gear box and the base.
4. The tensioner of claim 1 , further comprising a middle housing and a right housing that are removably fastened to one another, the feed wheel being positioned between the middle housing and the right housing.
5. The tensioner of claim 1 , further comprising a cutting block having a flange formed on a proximal end of the cutting block and protruding upward, the cutting block being connected to the base.
6. The tensioner of claim 1 , further comprising a cutting blade positioned by a proximal end of the tensioner and connected to the base.
7. The tensioner of claim 6 , wherein the lever further comprises a cutting contact coupled thereto, the lever reaching a cutting point when the lever is rotated a predetermined number of radians in a counter-clockwise direction, and the cutting contact touching the cutting blade at the cutting point and urging the cutting blade downward when the lever is rotated counter-clockwise beyond the cutting point.
8. The tensioner of claim 1 , further comprising a selective locking mechanism and a shaft that couples the feed wheel and the tension gear to one another, the feed wheel and shaft rotating counter-clockwise when a user pulls the associated strap toward the distal end of the tensioner and the selective locking system preventing the tension gear from rotating.
9. The tensioner of claim 8 , wherein the selective locking mechanism further comprises grooves formed in the shaft and a pawl-ring assembly including a ring that presses the pawl against the shaft, wherein the tension gear includes an opening formed therein to receive the shaft and a notch formed within the opening, the notch shaped to receive a top portion of the pawl, wherein the groove and the pawl are shaped so that the groove can receive a bottom portion of the pawl and so that the pawl can move out of the groove when the pawl-ring rotates in one direction and so that the pawl cannot move out of the groove when the pawl-ring rotates in a second direction that is opposite the first direction.
10. A tensioner with a cutter for applying an associated non-metallic strap around an associated load and for cutting an unused portion of the associated strap, the tensioner comprising:
a base;
a lever supported by the base and configured to pivot, the lever further including a cutting contact;
a gear rotatively mounted to the lever and configured to rotate when the lever is turned in a first direction;
a tightener coupled to the gear and configured to rotate when the gear rotates;
a feed wheel coupled to the tightener and configured to rotate when the tightener rotates;
a cutting blade positioned by a proximal end of the tensioner and connected to the base, the cutting contact touching the cutting blade at a cutting point when the lever is rotated a predetermined number of radians in a second direction that is opposite to the first direction, wherein the cutting contact urges the cutting blade downward when the lever is rotated in the second direction beyond the cutting point;
a gripper attached to the base, wherein a portion of the associated strap is positioned on and held stationary by the gripper, a downstream portion of the associated strap being wrapped around the associated load and fed to the tightener, wherein the downstream portion of the associated strap is fed underneath the feed wheel, wherein, when the lever is turned in the first direction, the associated strap is tensioned around the associated load.
11. The tensioner of claim 10 , further comprising a cutting block including a flange formed on a proximal end of the cutting block and protruding upward, the cutting block being connected to the base.
12. The tensioner of claim 10 , wherein the tightener further comprises a windlass, wherein the downstream portion of the associated strap is fed into the windlass.
13. A tensioner with a cutter for applying an associated non-metallic strap around an associated load and for cutting an unused portion of the associated strap, the tensioner comprising:
a base;
a lever supported by the base and configured to pivot;
a gear rotatively mounted to the lever and configured to rotate when the lever is turned in a first direction;
a tightener coupled to the gear and configured to rotate when the gear rotates;
a feed wheel coupled to the tightener configured to rotate when the tightener rotates;
a cutting block including a flange formed on a proximal end of the cutting block and protruding upward, the cutting block being connected to the base;
a gripper attached to the base, wherein a portion of the associated strap is positioned on and held stationary by the gripper, a downstream portion of the associated strap being wrapped around the associated load and fed to the tightener, wherein the downstream portion of the associated strap is fed underneath the feed wheel, and wherein, when the lever is turned in the first direction, the associated strap is tensioned around the associated load.
14. The tensioner of claim 13 , further comprising a cutting blade positioned by a proximal end of the tensioner and connected to the base, wherein the lever includes a cutting contact coupled thereto, the cutting contact touching the cutting blade at a cutting point when the lever is rotated a predetermined number of radians in a second direction that is opposite to the first direction, wherein the cutting contact urges the cutting blade downward when the lever is rotated in the second direction beyond the cutting point.
15. The tensioner of claim 13 , wherein the tightener further comprises a windlass, wherein the downstream portion of the associated strap is fed into the windlass.
16. A tensioner for applying an associated non-metallic strap around an associated load, the tensioner comprising:
a base;
a lever supported by the base and configured to pivot in a clockwise direction, the lever having a distal end near a distal end of the tensioner;
a drive gear rotatively mounted to the lever and configured to rotate clockwise when the lever is rotated in the clockwise direction;
a tension gear engaging the drive gear and configured to rotate counter-clockwise when the drive gear rotates in a clockwise direction, the tension gear having an opening formed therein and a notch formed within the opening;
a pawl-ring assembly including a ring that presses a pawl against a shaft, a top portion of the pawl configured to cooperate with the notch;
the shaft, the shaft receiving the tension gear and coupling a feed wheel to the tension gear, wherein the shaft has a shaped groove formed therein, the shaped groove receiving a bottom portion of the pawl, wherein the shaped groove and the pawl are shaped so that the pawl can move out of the groove when the shaft rotates in a first direction and so that the pawl cannot move out of the groove when the pawl-ring rotates in a second direction that is opposite the first direction;
the feed wheel coupled to the tension gear and configured to rotate counter-clockwise when the tension gear rotates in a counter-clockwise direction;
a gripper attached to the base, wherein a portion of the associated strap is positioned on and held stationary by the gripper to form a bottom layer, a downstream portion of the associated strap being wrapped around the associated load and fed underneath the feed wheel until it overlies the bottom layer and forms a top layer that is in contact with the feed wheel, wherein, when the lever is rotated in the clockwise direction and the feed wheel rotates counter-clockwise, the top layer is pulled toward a distal end of the tensioner and the associated strap is tensioned in a clockwise direction around the associated load.
17. The tensioner of claim 16 , further comprising a base plate extending vertically from the base and a gear box, the gear box including left, middle, and right housings, the base plate and the left, middle and right housings being removably fastened to one another, wherein the tension gear is positioned between the left and middle housings and the feed wheel is positioned between the middle and right housings.
18. The tensioner of claim 16 , further comprising a spring, wherein the spring is positioned on the outside of the gear box and is positioned between the gear box and the base.
19. The tensioner of claim 16 , wherein the groove is defined by a vertical proximal end that forms a substantially orthogonal edge with a bottom surface of the groove and a distal end that forms an obtuse angle with the bottom surface, and wherein the pawl is defined by a vertical proximal end and a curved distal end.