초록 ▼

An improved adjustable wheel structure mainly adapted for use in a trailing vehicle on which a yacht, boat or motorcycle can be mounted for transportation; the present wheel structure is provided with a special nut member having its inner surface half threaded and half smoothed, and the nut member i

An improved adjustable wheel structure mainly adapted for use in a trailing vehicle on which a yacht, boat or motorcycle can be mounted for transportation; the present wheel structure is provided with a special nut member having its inner surface half threaded and half smoothed, and the nut member is able to be adjusted forward or backward so that the threaded inner surface thereof can be selectively engaged with a vertically disposed adjusting screw rod which has a smaller diameter than the central through hole of the slidable nut member so that the wheel structure can be smoothly adjusted in height; as the threaded side of the nut member is adjusted to disengage from the screw rod with the smoothed side thereof in contact with the adjusting screw rod, the wheel structure can be adjusted quickly rather than in stepwise manner.

대표청구항 ▼

An improved adjustable wheel structure adapted for use in a trailing vehicle comprising: an outer tube having a number of facets disposed at the top end thereof with a hand operated shaft being horizontally guided through the faceted portion, and a first bevel gear means being mounted to the shaft a

An improved adjustable wheel structure adapted for use in a trailing vehicle comprising: an outer tube having a number of facets disposed at the top end thereof with a hand operated shaft being horizontally guided through the faceted portion, and a first bevel gear means being mounted to the shaft and located within said outer tube; an inner tube disposed within said outer tube and having a closed top end which is provided with a hole so that a screw rod can be located therethrough; on the top portion of said inner tube being provided with a peripheral recess which defines an inward protrusion in said inner tube, thereby a supporting board having a central hole disposed thereon can be supported in place so as to form a chamber near the top portion of said inner tube; a slidable nut member housed in said chamber at the top portion of said inner tube, having an oval-shaped through hole with said screw rod going therethrough; the surface of said oval-shaped hole being half threaded and half smoothed; a vertical hole being disposed on an upper wall of said nut member, in communication with a horizontal burrow horizontally disposed on a side wall of said nut member; an adjusting bolt member having a peripheral groove disposed at the front end thereof being led through holes on the outer tube and inner tube and into said horizontal burrow with a pin element located in said vertical hole and engaged with said peripheral groove so as to operatively join said nut member and bolt member together; the top end of said screw rod being provided with a second bevel gear engaged with said first bevel gear mounted on said shaft; the hole on said outer tube, through which said adjusting bolt member is guided, being large enough to permit the bolt member to move upward or downward in adjustment along with the nut member in said inner tube; whereby the actuation of said adjusting bolt member can move said nut member inward or outward so as to keep the half threaded inner surface of said nut member engaged with or disengaged from said screw rod where the other half smoothed inner surface is in contact with said screw rod allowing the wheel structure to be adjusted in slow or fast manner.