Lock and release mechanism for fifth wheel

• US 5,456,484 A
• Filed: 12/29/1994
• Issued: 10/10/1995
• Est. Priority Date: 12/29/1994
• Status: Expired due to Fees

• Current Assignee: John P.K. Fontaine
• Original Assignee: Fontaine Fifth Wheel Company (Berkshire Hathaway Incorporated)
• Inventors: Fontaine, John P. K.
• Primary Examiner(s): Hill, Mitchell J.
• Assistant Examiner(s): Hurley, Kevin
• Application Number:
  US08/365,807
• Time in Patent Office: 285 Days
• Field of Search: 280/433, 280/434, 280/435, 280/436, 280/437, 280/438.1, 280/441.1
• US Class Current: 280/434
• CPC Class Codes: B62D 53/12 engaging automatically

Abstract

A simpler, more direct mechanism for locking and unlocking of a king pin of a fifth wheel is provided. The mechanism includes a jaw member, a wedge member, a bumper member and a lever member interconnecting the jaw member, the wedge and the bumper member. The system may be operated by a two-way air cylinder, a one-way air cylinder or in an alternate embodiment, may be incorporated into an existing manually operated fifth wheel system as a retrofit assembly so as to convert existing fifth wheel locking mechanisms to the arrangement of the present invention.

Claims

1. A lock and release mechanism for a fifth wheel, said lock and release mechanism comprising:

a housing having a throat for receipt of a fifth wheel king pin,

a jaw member slidably mounted in said housing for engagement with said king pin,

a wedge member slidably mounted in said housing for engaging said jaw member and locking said jaw member in engagement with said king pin,

a lever member interconnecting said wedge member and said jaw member,

a bumper member pivotally mounted with respect to said jaw member and said lever member for initially extending into said throat and for being pushed out of said throat by said king pin entering said throat and being biased toward entry into said throat upon unlocking of said king pin by said jaw member, and

at least one device for moving said jaw member into a locked position in engagement with said king pin and for moving said jaw member away from said king pin for release of said king pin and for positioning said jaw member to allow insertion of a king pin.

2. A lock and release mechanism as claimed in claim 1, wherein an operating handle is connected to said wedge member and extends from said housing.

3. A lock and release mechanism as claimed in claim 2, wherein said operating handle is straight.

4. A lock and release mechanism as claimed in claim 2, wherein said operating handle includes a threaded portion located externally of said housing.

5. A lock and release mechanism as claimed in claim 4, wherein a nut is threadingly mounted on said threaded portion for rotation and movement of said wedge member.

6. A lock and release mechanism as claimed in claim 1, wherein said at least one device is a two-way piston cylinder unit.

7. A lock and release mechanism as claimed in claim 1, wherein said at least one device is a piston cylinder unit and at least one spring.

8. A lock and release mechanism as claimed in claim 1, wherein said at least one device are at least two springs.

9. A lock and release mechanism as claimed in claim 1, wherein a switch is positioned to indicate a positioning of said king pin.

10. A lock and release mechanism as claimed in claim 1, wherein a switch is positioned to indicate a positioning of said wedge member.

11. A lock and release mechanism for a fifth wheel, said lock and release mechanism comprising:

a housing having a throat for receipt of a fifth wheel king pin,

a jaw member slidably mounted in said housing for engagement with said king pin when said king pin is in said throat,

a wedge member slidable mounted in said housing for engaging said jaw member and locking said jaw member in engagement with said king pin,

a lever member interconnecting said wedge member and said jaw member,

a bumper member pivotally mounted with respect to said jaw member and said lever member for initially extending into said throat and for being pushed out of said throat by said king pin entering said throat and being biased toward entry into said throat upon unlocking of said king pin by said jaw member,

at least one spring structure for biasing said jaw member and said wedge member to lock said king pin in said throat, and

at least one device for moving said jaw member and said wedge member away from said throat to provide access to said throat for entry or removal of said king pin.

12. A lock and release mechanism as claimed in claim 11, wherein an operating handle is connected to said wedge member and extends from said housing.

13. A lock and release mechanism as claimed in claim 12, wherein said operating handle is straight.

14. A lock and release mechanism as claimed in claim 12, wherein said operating handle includes a threaded portion located externally of said housing.

15. A lock and release mechanism as claimed in claim 14, wherein a nut is threadingly mounted on said threaded portion for rotation and movement of said wedge member.

16. A lock and release mechanism as claimed in claim 11, wherein said at least one device is a two-way piston cylinder unit.

17. A lock and release mechanism as claimed in claim 11, wherein said at least one device is a piston cylinder unit and at least one spring.

18. A lock and release mechanism as claimed in claim 11, wherein a switch is positioned to indicate a positioning of said king pin.

19. A lock and release mechanism as claimed in claim 11, wherein a switch is positioned to indicate a positioning of said wedge member.

20. A lock and release mechanism as claimed in claim 11, wherein said at least one spring structure engages a connection between said wedge member and said lever member and a connection between said jaw member and said lever member.