Retractable tie-down with rotation brake

• US 7,503,736 B1
• Filed: 08/22/2006
• Issued: 03/17/2009
• Est. Priority Date: 08/22/2006
• Status: Active Grant

• Current Assignee: Weiguo Chen
• Original Assignee: Weiguo Chen
• Inventors: Chen, Weiguo
• Primary Examiner(s): GUTMAN, HILARY L
• Application Number:
  US11/466,188
• Time in Patent Office: 938 Days
• Field of Search: 410/7, 410 9- 12, 410/19, 410 21- 23, 410/97, 410/100, 410/103, 248/499, 254/217, 254/223, 254/243, 254/245, 254/247, 254/330, 254/345, 254/346, 254/352, 254355-357, 254/365, 254/369, 254/376
• US Class Current: 410/100
• CPC Class Codes: B60P 7/083 Tensioning by repetetive movement of an actuating member
• CPC Class Codes: B61D 45/00 Means or devices for securing or supporting the cargo, including protection against shocks for vehicles in general B60P7/00

Abstract

The retractable tie-down provides an adjustable strap under control of a rotation brake during retraction and pay-out. The rotation brake impedes rotation of a spool on which the strap is wrapped and unwrapped during retraction and pay-out of the strap as the tie-down operates in one of either a pay-out mode or a retraction mode. Thus, the rate of retraction of the strap is user-controlled through the rotation brake. The tie-down is provided with a lanyard issuing from rearward from the tie-down and a strap issuing forward from the tie-down for securement without direct, or positive attachment of the tie down to an anchor point, such as a chassis of a vehicle or the like.

Claims

1. A retractable tie-down assembly including an assembly frame, a spool with a spool axis rotatably mounted on the assembly frame and rotatable in a pay out direction and a retracting direction, at least one ratchet wheel on ends of the spool, the ratchet wheel including ratchet teeth on the ratchet wheel, a strap adapted to be wound on and unwound from said spool with one end attached thereto, a ratcheting handle on a handle frame pivotably connected to the assembly frame and configured to optionally engage said ratchet wheel to rotate said spool in said retracting direction, the improvement comprising,

the tie-down assembly configurable between a ratchet configuration and a pay out configuration, in which

(a) in the ratchet configuration,

the handle includes a pawl under spring bias toward continuous engagement of the pawl with said ratchet wheel such that when the handle alone is lifted, the handle and ratchet wheel cooperating to ratchet said spool to rotate in said retracting direction, and

a rotation lock mounted to said assembly frame adapted to lock said ratchet wheel against rotation in said pay out direction by engaging the ratchet wheel, wherein said rotation lock remains in a locking position when said handle is movable to ratchet said ratchet wheel, the rotation lock being under spring bias toward the locking position therein allowing the ratchet wheel to rotate in said retracting direction but preventing the ratchet wheel from rotating in said pay out direction, and

(b) in the pay out configuration,

said handle is moved downward out of the ratchet configuration effecting a withdrawal of the pawl from engagement with the ratchet wheel and a withdrawal of the rotation lock from engagement with the ratchet wheel,

and further comprising a rotation brake pivotably mounted to said assembly frame and urged against the ratchet wheel under a spring bias resulting in a frictional engagement between the ratchet wheel and the rotation brake sufficient to prevent rotation of the ratchet wheel in the retracting direction while allowing the ratchet wheel to rotate in the pay out direction under frictional resistance of the rotation brake.

2. The tie-down assembly of claim 1 wherein the rotation lock comprises a lock plate forward in the assembly frame engaging the ratchet wheel.

3. The tie down assembly of claim 2 wherein the rotation lock comprises said lock plate extending through slits forward in the assembly frame, urged forward in the slits under bias of a lock spring between the assembly frame and the lock plate and wherein as the lock plate engages the ratchet wheel the lock plate is pushed against upper sides of the slits therein binding the lock plate from rotation and locking the ratchet wheel from rotation.

4. The tie-down assembly of claim 1 wherein the handle frame mounts to the assembly frame rotatably on the spool axis and further comprising a forward cam on the handle frame urging the rotation lock away from the ratchet wheel when the handle is urged down into said pay out configuration.

5. The tie-down assembly of claim 4 wherein the handle frame mounts to the assembly frame rotatably on the spool axis, the handle frame comprising a rearward cam urging the rotation brake away from the ratchet wheel when the handle is urged down into said pay out configuration.

6. The tie-down assembly of claim 1 wherein the handle frame mounts to the assembly frame rotatably on the spool axis, the handle frame comprising a rearward cam urging the rotation brake away from the ratchet wheel when the handle is urged down into said pay out configuration.

7. The tie down assembly of claim 1 further comprising a limiter on said assembly frame dividing handle motion between said ratchet configuration and said pay out configuration and further comprising a limiter latch engaging said limiter on a first side of said limiter in said ratchet configuration or engaging said limiter on a second side of said limiter in said pay out configuration, the limiter preventing the handle from moving out of each of said configurations.

8. The tie down assembly of claim 7 further comprising a release lever extending from said limiter latch configured such that when said release lever is depressed, the limiter latch is raised above said limiter to enable movement of the limiter latch between said ratchet and pay out configurations.

9. The tie down assembly of claim 8 further comprising a spring biasing the release lever against being raised above said limiter.

10. The tie down assembly of claim 1 wherein with the assembly in the pay out configuration the ratchet wheel is free from engagement with the rotation lock and the pawl and rotatable under resistance of the rotation brake spring biased against the ratchet wheel therein allowing the ratchet wheel to rotate in the pay out direction under pull of the strap under frictional resistance of the rotation brake sufficient to prevent retraction rotation of the ratchet wheel in the retracting direction.

11. The tie down assembly of claim 10 wherein the tie down assembly in the pay-out configuration remains amenable to further pay out after a first pay out by only pulling the strap until the strap is fully unwound from the spool.

12. The tie down assembly of claim 1 wherein in the pay out configuration the ratchet wheel is free from engagement with the rotation lock and the pawl, rotatable under resistance of the rotation brake spring biased against the ratchet wheel therein allowing the ratchet wheel to rotate in pay out direction rotation under pull of the strap under frictional resistance of the rotation brake sufficient to prevent rotation of the ratchet wheel in the retracting direction and further comprising a release lever connected to the rotation brake such that depressing the release lever withdraws the rotation brake from the ratchet wheel progressively as the release lever is depressed such that the strap is retractable by releasing or partially releasing the rotation brake by depressing the release lever with the rate of retraction being user-controlled by partially releasing the rotation brake.

13. The tie down assembly of claim 1 wherein the rotation brake is pivotably mounted to the assembly frame.

14. The tie down assembly of claim 1 wherein the rotation brake engages the ratchet wheel at an underside of the ratchet wheel.

15. The tie down assembly of claim 1 wherein the handle pawl and the rotation brake engage the ratchet wheel rearward of the spool and the rotation lock engages the ratchet wheel forward of the spool.

16. The tie down assembly of claim 1 further comprising a shaft rearward in the assembly frame with the rotation brake pivotably secured thereto.

17. The tie down assembly of claim 16 further comprising a lanyard secured to said shaft and extending therefrom rearward from the assembly.

18. A retractable tie-down assembly including an assembly frame, a spool with a spool axis rotatably mounted on the assembly frame and rotatable in a pay out direction and a retracting direction, at least one ratchet wheel on ends of the spool, the ratchet wheel including ratchet teeth on the ratchet wheel, a strap adapted to be wound on or unwound from said spool with one end attached thereto, a ratcheting handle on a handle frame pivotably connected to the assembly frame and configured to optionally engage said ratchet wheel to rotate said spool in said retracting direction, the improvement comprising,

the tie-down assembly configurable between a ratchet configuration and a pay out configuration, in which

(a) in the ratchet configuration,

a rotation lock mounted to said assembly frame is operable to lock said ratchet wheel against rotation in said pay out direction by engaging the ratchet wheel,

said ratcheting handle being movably mounted to said assembly frame, the handle including a pawl under spring bias toward continuous engagement of the pawl with the ratchet wheel such that when the handle alone is lifted, the handle and ratchet wheel cooperating to ratchet said spool to rotate in said retracting direction, and

wherein said rotation lock remains in a locking position when said handle is movable to ratchet said ratchet wheel, the rotation lock being under spring bias toward the locking position when the handle rotates the ratchet wheel in the ratchet wheel retracting direction but preventing the ratchet wheel from rotating in said pay out direction, and

(b) in the pay out configuration,

said handle is moved downward out of the ratchet configuration effecting a withdrawal of the pawl from engagement with the ratchet wheel and a withdrawal of the rotation lock from engagement with the ratchet wheel,

and further comprising a rotation brake pivotably mounted to said assembly frame and urged against the ratchet wheel under a spring bias resulting in a frictional engagement between the ratchet wheel and the rotation brake sufficient to prevent rotation of the ratchet wheel in the retracting direction while allowing the ratchet wheel to rotate in the pay out direction under frictional resistance of the rotation brake,

a limiter on said assembly frame dividing handle motion between said ratchet configuration and said pay out configuration and further comprising a limiter latch engaging said limiter on a first side of said limiter in said ratchet configuration or engaging said limiter on a second side of said limiter in said pay out configuration, the limiter preventing the handle from moving out of each of said configurations,

a release lever extending from said limiter latch configured such that when said release lever is depressed, the limiter latch is raised above said limiter to enable movement of the limiter latch between said ratchet and pay out configurations, wherein with the limiter latch below the limiter in the pay out configuration, the ratchet wheel is free from engagement with the rotation lock and the pawl, rotatable under resistance of the rotation brake spring biased against the ratchet wheel therein allowing the ratchet wheel to rotate in the pay out direction under pull of the strap under frictional resistance of the rotation brake sufficient to prevent rotation of the ratchet wheel in the retracting direction, wherein the tie down assembly in pay out configuration remains amenable to further pay-out after a first pay-out by only pulling the strap until the strap is fully unwound from the spool.

19. The retractable tie-down assembly of claim 18 wherein the release lever connects to the rotation brake such that depressing the release lever withdraws the rotation brake from the ratchet wheel progressively as the release lever is depressed such that the strap can be retracted by releasing or partially releasing the rotation brake by depressing the release lever with the rate of retraction being user-controlled by partially releasing the rotation brake.

20. A retractable tie-down assembly including an assembly frame, a spool with a spool axis rotatably mounted on the assembly frame and rotatable in a pay out direction and a retracting direction, at least one ratchet wheel on ends of the spool, the ratchet wheel including ratchet teeth on the ratchet wheel, a strap adapted to be wound on or unwound from said spool with one end attached thereto, a ratcheting handle on a handle frame pivotably connected to the assembly frame and configured to optionally engage said ratchet wheel to rotate said spool in said retracting direction, the improvement comprising,

the tie-down assembly configurable between a ratchet configuration and a pay out configuration, in which

(a) in the ratchet configuration,

a rotation lock mounted forward in said assembly frame is adapted to lock said ratchet wheel against rotation in said pay out direction by engaging the ratchet wheel at a ratchet wheel tooth radial side, the rotation lock further comprising a lock plate extending through slits forward in the assembly frame, urged forward in the slits under bias of a lock spring between the assembly frame and the lock plate and wherein as the lock plate engages a tooth of the ratchet wheel the lock plate is pushed against upper sides of the slits therein binding the lock plate from rotation and locking the ratchet wheel from rotation,

said ratcheting handle frame movably mounted rotatably on the spool axis, the handle frame further comprising a forward cam urging the rotation lock away from the ratchet wheel when the handle is urged down into said pay out configuration, the handle including a pawl under spring bias toward continuous engagement of the pawl with the ratchet wheel when the handle alone is lifted, the handle and ratchet wheel cooperating to ratchet said spool to rotate in said retracting direction, wherein as the handle is lowered into the pay out configuration, a cam forward cam on the handle frame moves the lock plate away from the ratchet wheel,

wherein said rotation lock remains in a locking position when said handle is movable to ratchet said ratchet wheel, the rotation lock being under spring bias toward the locking position, therein allowing the ratchet wheel to rotate in said retracting direction but preventing the ratchet wheel from rotating in said pay out direction, and

(b) in which in the pay out configuration,

said handle is moved downward out of the ratchet configuration effecting a withdrawal of the pawl from engagement with the ratchet wheel and a withdrawal of the rotation lock from engagement with the ratchet wheel,

and further comprising a rotation brake pivotably mounted to said assembly frame and urged against the ratchet wheel under a spring bias resulting in a frictional engagement between the ratchet wheel and the rotation brake sufficient to prevent rotation of the ratchet wheel in the retracting direction while allowing the ratchet wheel to rotate in the pay out direction under frictional resistance of the rotation brake.

21. The tie down assembly of claim 20 further comprising a transverse shaft rearward in the assembly frame with the rotation brake pivotably secured thereto and a lanyard secured to said shaft and extending therefrom rearward from the assembly.