Load-leveling, weight-distributing hitch system

• US 7,506,885 B2
• Filed: 09/13/2004
• Issued: 03/24/2009
• Est. Priority Date: 01/12/1998
• Status: Expired due to Term

• Current Assignee: Camco Manufacturing Incorporated
• Original Assignee: Colibert Enterprises
• Inventors: Colibert, Floyd A.
• Primary Examiner(s): Winner; Tony H.
• Application Number:
  US10/939,948
• Publication Number:
  US 20050057019A1
• Time in Patent Office: 1,653 Days
• Field of Search: 280/455.1,405.1,406.2,432,511,407
• US Class Current: 280/405.1
• CPC Class Codes: B60D 1/065 characterised by the hitch mechanism
• CPC Class Codes: B60D 1/247 for improving weight distribution
• CPC Class Codes: B60D 1/248 for measuring, indicating or displaying the weight
• CPC Class Codes: B60D 1/345 the springs being of the bar or leaf type torsion bars per se F16F1/14, leaf springs per se F16F1/18

Abstract

A load-leveling, weight-distributing hitch system includes a hitch head, configured for attachment to a rear of a towing vehicle, a T socket, horizontally pivotally attached to the hitch head, a spring bar, having a forward end removably attached to the T socket, a tension member, connected to a rearward end of the spring bar, and a spring bar lift, configured for attachment to the tongue of a trailer. The spring bar lift is configured to apply tension to the tension member, so as to lift the rearward end of the spring bar, and thereby transmit a moment to the hitch head tending to lift the rear of the towing vehicle.

Claims

1. A load-leveling, weight-distributing hitch system, comprising:

a) a hitch head, configured for attachment to a rear of a towing vehicle;

b) a T socket, horizontally pivotally attached to the hitch head;

c) a spring bar, having a forward end removably attached to the T socket;

d) a tension member, connected to a rearward end of the spring bar;

e) a spring bar lift, configured for attachment to a tongue of a trailer, configured to apply tension to the tension member, so as to lift the rearward end of the spring bar, and thereby transmit a moment to the hitch head tending to lift the rear of the towing vehicle; and

f) an adjustment mechanism, associated with the hitch head, configured for adjusting a vertical pitch of the hitch head relative to the towing vehicle, said adjustment mechanism comprising an arcuate slot that facilitates selective positioning of the hitch head in one of an infinite number of vertical pitch orientations as constrained by said arcuate slot, said adjustment mechanism comprising an adjustment member supported by the hitch head and configured to press against a shank associated with the towing vehicle to determine a pivotal orientation of the hitch head depending upon a degree of adjustment of the adjustment member.

2. A system in accordance with claim 1, further comprising a ball hitch, disposed atop a hitch head.

3. A system in accordance with claim 1, wherein the adjustment member comprises a thumb screw, threadedly disposed in the hitch head, having a head end configured to press against the shank associated with the towing vehicle, so as to determine the pivotal orientation of the hitch head depending upon a degree of extension of the thumb screw.

4. A system in accordance with claim 1, wherein the adjustment mechanism comprises:

a) a shank, associated with the towing vehicle, the hitch head being attached to the shank;

b) a hitch head mount, configured to attach the hitch head to the shank, configured to affix the hitch head to the shank in a selected pivotal orientation; and

c) a thumb screw, threadedly disposed in the hitch head, having a head end configured to press against the shank, such that rotation of the thumb screw in a first direction causes the hitch head to pitch rearwardly downward, and rotation of the thumb screw in a second direction allows the hitch head to be rotated forwardly upward, so as to control the pitch of the ball hitch.

5. A system in accordance with claim 1, wherein the spring bar is attachable to and disconnectable from the T socket without tools.

6. A system in accordance with claim 5, wherein the T socket comprises a spring bar opening, configured to receive the forward end of the spring bar when substantially linearly inserted thereinto, and configured to allow disconnection of an inserted spring bar when the spring bar is axially rotated and substantially linearly retracted therefrom.

7. A system in accordance with claim 5, wherein the T socket comprises a quick-connect, quick-disconnect system, comprising:

a) a spring bar opening in the T socket, configured to slidingly receive the forward end of the spring bar thereinto;

b) a springed retainer pin, extending into the spring bar opening, configured to engage and lock the forward end of the spring bar within the spring bar opening when the spring bar is inserted thereinto, and to be selectively disengageable to allow the spring bar to be removed from the spring bar opening.

8. A system in accordance with claim 7, further comprising:

a) a taper, disposed on the forward end of the spring bar, configured to push the retainer pin to a non-interfering position during forward insertion of the spring bar;

b) a retainer pin slot, disposed on the forward end of the spring bar rearwardly of the taper, the retainer pin being configured to engage the retainer pin slot to lock the spring bar within the spring bar opening when the spring bar is pushed to a forward locking position.

9. A system in accordance with claim 8, wherein the spring bar has a long axis, and the retainer pin slot is configured to push the retainer pin to the non-interfering position when the spring bar is rotated the long axis, to allow removal of the spring bar from the spring bar opening.

10. A system in accordance with claim 5, wherein lubricating material associated with the hitch head and disposed to promote horizontal pivoting of the spring bar is associated with the T socket and substantially prevented from direct contact with the forward end of the spring bar.

11. A system in accordance with claim 1, wherein the spring bar lift comprises:

a) a base, configured to attach to the tongue of the trailer; and

b) a latch, pivotally attached to the base, configured to receive a top end of the tension member, and moveable between a closed position, wherein tension is applied to the tension member, so as to lift the rearward end of the spring bar, and an open position, wherein tension on the tension member is released.

12. A system in accordance with claim 11, wherein the tension member comprises a chain, having links configured to attach to the latch.

13. A system in accordance with claim 11, wherein the latch comprises an inverted U-shaped element, having a mechanism for attaching the tension member.

14. A system in accordance with claim 13, wherein the tension member comprises a chain, and the mechanism for attaching the tension member comprises a chain opening, disposed in the inverted U-shaped element, configured to receive and hold a link in the chain.

15. A system in accordance with claim 13, further comprising an opening in a first side of the inverted U-shaped element, and a lock bar slot disposed in a second side of the inverted U-shaped element, whereby a lock bar may be inserted through the opening and fitted into the lock bar slot, to allow greater rotational force to be applied to the latch when closing the latch.

16. A system in accordance with claim 12, further comprising a spring bar lift lock, attached to the base, configured to releasably lock the latch in the closed position.

17. A system in accordance with claim 1, wherein the spring bar lift comprises a retention loop, the tension member being inserted therethrough, configured to reduce movement of the tension member to help maintain tension during sway of the trailer.

18. A system in accordance with claim 1, further comprising a sway control adjustment mechanism, associated with the hitch head, configured to allow adjustment of resistance to horizontal pivoting of the T socket.

19. A system in accordance with claim 18, wherein the sway control mechanism comprises a bottom plate, attached to the hitch head, disposed adjacent to the T socket, and having an adjustment mechanism, configured to adjust friction against the T socket, so as to allow adjustment of the freedom of horizontal pivoting of the T socket.

20. A system in accordance with claim 1, wherein the T socket comprises a pair of T sockets, the spring bar comprises a pair of spring bars, the tension member comprises a pair of tension members, one associated with each spring bar, and the spring bar lift comprises a pair of spring bar lifts, each spring bar lift being configured to attach to a laterally-spaced portion of the trailer tongue, and to receive one of the tension members.

21. A load-leveling, weight-distributing hitch system, comprising:

a) a hitch head, attached to a rear of a towing vehicle, configured to receive a trailer tongue;

b) a T socket, horizontally pivotally attached to the hitch head, configured for receiving an end of a spring bar, and configured to transmit vertical moment to the hitch head;

c) a spring bar, having a first end and a second end, the first end being removably received in the T socket;

d) a spring bar lift, attached to the trailer tongue;

e) a tension member, having a lower end connected to the second end of the spring bar, and an upper end connected to the spring bar lift, the spring bar lift having a closed position wherein tension is applied to the tension member, so as to lift the second end of the spring bar relative to the trailer tongue, and thereby transmit a moment to the hitch head tending to lift the rear of the towing vehicle; and

f) an adjustment mechanism, associated with the hitch head, configured for adjusting a vertical pitch of the hitch head relative to the towing vehicle, said adjustment mechanism comprising an arcuate slot that facilitates selective positioning of the hitch head in one of an infinite number of vertical pitch orientations as constrained by said arcuate slot, said adjustment mechanism comprising an adjustment member supported by the hitch head and configured to press against a shank associated with the towing vehicle to determine a pivotal orientation of the hitch head depending upon a degree of adjustment of the adjustment member.

22. A system in accordance with claim 21, wherein the T socket comprises a pair of T sockets, the spring bar comprises a pair of spring bars, the tension member comprises a pair of tension members, one associated with each spring bar, and the spring bar lift comprises a pair of spring bar lifts, each spring bar lift being configured to attach to a laterally-spaced portion of the trailer tongue, and to receive one of the tension members.

23. A load-leveling, weight-distributing hitch system, comprising:

a) a towing vehicle, having a rear;

b) a trailer, having a trailer tongue including a frame;

c) a hitch head, attached to the rear of the towing vehicle;

d) a ball hitch disposed atop the hitch head, configured to receive the trailer tongue;

e) a pair of T sockets, horizontally pivotally attached to the hitch head, each configured for receiving an end of a spring bar, and configured to transmit vertical moment to the hitch head;

f) a pair of spring bars, each having a first end and a second end, the first end of each spring bar being removably received within a respective one of the T sockets;

g) a pair of spring bar lifts, attached to opposing lateral sides of the frame of the tongue of the trailer;

h) a pair of tension members, each having a lower end connected to the second end of a respective one of the spring bars, and an upper end connected to a respective one of the spring bar lifts, the spring bar lifts being selectively adjustable between a closed position, wherein tension is applied to the respective tension member, so as to lift the second end of the respective spring bar relative to the trailer tongue frame, to thereby transmit a moment to the hitch head tending to lift the rear of the towing vehicle, and an open position, wherein tension on the respective tension member is released; and

i) an adjustment mechanism, associated with the hitch head, configured for adjusting a vertical pitch of the hitch head relative to the towing vehicle, said adjustment mechanism comprising an arcuate slot that facilitates non-discrete infinitely variable pitch adjustment of the hitch head as constrained by the arcuate slot, said adjustment mechanism comprising an adjustment member supported by the hitch head and configured to press against a shank associated with the towing vehicle to determine a pivotal orientation of the hitch head depending upon a degree of adjustment of the adjustment member.