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US 8,894,040 B2Granted
Trailer tongue lift jack
OwnerMark Murriinventor
Life of this patent
Estimating the term…
Abstract
Presented is a trailer tongue lift jack which tilts in order to allow the tongue and hitch to be aligned with a towing ball attached to a towing vehicle. The trailer lift jack includes a ball joint which allows the body of the hitch to tilt for this alignment step. The lift jack can also rotate to a storage position which is basically horizontal, and rotate to a lift position which is basically vertical for lifting the trailer tongue.
Claims13
A trailer tongue lift jack comprising:
- a generally cylindrical lift jack body attached to a trailer tongue frame, said lift jack body having a lifting assembly comprising a screw with a crank handle, for lifting said trailer tongue;
- and
- a tilt assembly attached to said trailer tongue frame, said tilt assembly comprising a ball joint, and a cage enclosing said ball joint, with said ball joint and said cage allowing said lift jack body to tilt in order to move said trailer tongue when connecting said trailer tongue to a tow hitch;
- and
- a cylindrical sidewall with a top edge and a bottom edge, an annular top plate attached to said sidewall top edge, an annular bottom plate attached to said sidewall bottom edge, with said annular plates defining a shaft passage between said lift jack body to allow said lift jack body to tilt.
2 more elements
A trailer tongue lift jack, comprising:
- a generally cylindrical lift jack body attached to a trailer tongue frame, said lift jack body having a lifting assembly comprising a screw with a crank handle, for lifting said trailer tongue;
- a tilt assembly attached to said trailer tongue frame, said tilt assembly comprising a ball joint, and a cage enclosing said ball joint, with said ball joint and said cage allowing said lift jack body to tilt in order to move said trailer tongue when connecting said trailer tongue to a tow hitch;
- said cage further comprising a cylindrical sidewall with a top edge and a bottom edge, an annular top plate attached to said sidewall top edge, an annular bottom plate attached to said sidewall bottom edge, with said annular plates defining a shaft passage between said lift jack body to allow said lift jack body to tilt;
- a bearing attached to said annular top plate on a bottom side positioned to contact said ball joint;
- at least one set screw in said sidewall, with a threaded screw passage, and a threaded set screw, with said set screw configured to press against said ball joint when turned, thereby immobilizing said ball joint;
- and
- a foot plate on an end of said lift jack body opposite said crank handle.
4 more elements
A trailer tongue lift jack, comprising;
- a generally cylindrical lift jack body attached to a trailer tongue frame, said lift jack body having a lifting assembly comprising a screw with a crank handle, for lifting said trailer tongue;
- a tilt assembly attached to said trailer tongue frame, said tilt assembly comprising a ball joint, and a cage enclosing said ball joint, with said ball joint and said cage allowing said lift jack body to tilt in order to move said trailer tongue when connecting said trailer tongue to a tow hitch;
- said cage further comprising a cylindrical sidewall with a top edge and a bottom edge, an annular top plate attached to said sidewall top edge, an annular bottom plate attached to said sidewall bottom edge, with said annular plates defining a shaft passage between said lift jack body to allow said lift jack body to tilt;
- a bearing attached to said annular top plate on a bottom side positioned to contact said ball joint;
- at least one set screw in said sidewall, with a threaded screw passage, and a threaded set screw, with said set screw configured to press against said ball joint when turned, thereby immobilizing said ball joint;
- at least one groove in said ball joint for engagement with said set screw. and
- a foot plate on an end of said lift jack body opposite said crank handle.
4 more elements
Dependencies are inferred from the claim text.