Patent Description:
Nowadays, uses of sun umbrellas can be seen everywhere. The sun umbrellas are usually supported by umbrella bases, and most of the umbrella bases are carried manually. The weight of an umbrella base is an important factor to stably support an umbrella body, and the umbrella base must be heavy enough to support the umbrella body, so the umbrella base is usually heavy and can be moved only through the cooperation of several people during manual carrying, which is not only time-consuming and laborious, but also has a high risk factor, therefore, it is extremely inconvenient for moving the sun umbrella. From <CIT> an example of a comfortably movable sun umbrella base with wheels and a pull rod assembly is known.

In order to solve the problems of difficult carrying of sun umbrella bases and inconvenient movement of sun umbrellas, the invention is designed to provide a solution of a comfortably movable sun umbrella base.

A comfortably movable sun umbrella base includes an outer frame, an underframe being disposed in the outer frame, and roller wheels being provided at the bottom of the underframe. A pull rod assembly is disposed on at least one side of the outer frame, fixed tubes are cooperatively disposed at both ends of the pull rod assembly, a limiting assembly is disposed at an end of each fixed tube, the limiting assembly is connected to the underframe, the pull rod assembly can be overturned when being drawn outwards relative to the fixed tubes to the extent that the pull rod assembly abuts against the ends of the fixed tubes, the limiting assemblies are in a limiting fit with the pull rod assembly overturned upwards, and at the same time, through a warp motion, the roller wheels at the bottom of the underframe are downwards exposed out of the outer frame to abut against the ground, so as to achieve the movement of the base.

Further, the pull rod assembly includes a pull rod, guide rods are disposed at both ends of the pull rod, and the guide rods are disposed in the fixed tubes and can be drawn to move along the fixed tubes.

Further, the guide rod includes a convex groove that is opened at the bottom, snapping members are disposed on both sides of the top of the convex groove, an inner guide rod is disposed in the convex groove, and the inner guide rod is fixed to a corner connector at one end, and provided with a top member and a pulley that drives the guide rod to move along a bottom wall of the fixed tube at the other end.

Further, the limiting assembly includes a supporting member disposed between the fixed tube and the underframe, the supporting member is provided with a limiting slot for the top member and the pulley to snap into at the top, and the fixed tube is cooperatively provided with a notch at a position corresponding to the limiting slot.

Further, the limiting assembly further includes a locking member disposed in the fixed tube and configured to cooperatively abut against the snapping member.

Further, an arc-shaped groove provided in the snapping member achieves that the locking member snaps tightly against the snapping member within a corresponding angle of the arc-shaped groove.

Further, an upper frame is provided on the top of the outer frame, the pull rod assembly is disposed on the upper frame, the upper frame is an L-shaped frame, fixed on the top of the outer frame at one end by fixing members, and provided with a panel on the top of the other end, and the pull rod assembly is disposed in an L-shaped end surface.

Further, the fixed tube is fixed to the upper frame at the bottom and provided with channel grooves inside, the guide rods are cooperatively disposed in the channel grooves, and the guide rod is fixed to the corner connector at one end, and provided with the top member at the other end.

Further, the corner connector comprises a fan-shaped insert that is connected by inserting to the pull rod and a convex insert that fits with the convex groove of the guide rod.

Further, the guide rod is fixed to the convex insert through a fastener disposed at the top of the fixed tube.

Compared with the prior art, the invention has the following advantages: through the cooperation of the provided pull rod assemblies and limiting assemblies, not only the roller wheels can be driven and guided to be downwards exposed out of the outer frame to abut against the ground, so as to finish the movement of the base, but also the roller wheels can be made to enter the outer frame upwards to be hidden, such that the outer frame abuts against the ground, so as to achieve the fixation of the base; and after the roller wheels are downwards exposed out of the outer frame, the sun umbrella base can be comfortably moved by pushing the pull rod that is lifted up.

In the figures: <NUM>-outer frame, <NUM>-underframe, <NUM>-cross-shaped reinforcing frame, <NUM>-upper frame, <NUM>-panel, <NUM>-pull rod, <NUM>-fixed tube, <NUM>-guide rod, <NUM>-convex groove, <NUM>- pulley, <NUM>-top member, <NUM>-snapping member, <NUM>-fixing member, <NUM>-fastener, <NUM>-tripod, <NUM>-supporting member, <NUM>-limiting slot, <NUM>-corner connector, <NUM>-fan-shaped insert, <NUM>-convex insert, <NUM>-blocking member, <NUM>-locking member, <NUM>-roller wheel.

The present invention will be further described below with reference to the drawings.

As shown in <FIG>, a comfortably movable sun umbrella base includes an outer frame <NUM>, an underframe <NUM> being disposed in the outer frame <NUM>, and roller wheels <NUM> being provided at the bottom of the underframe <NUM>. An upper frame <NUM> is disposed on the outer frame <NUM>, a pull rod assembly is disposed on at least one side of the upper frame <NUM>, fixed tubes <NUM> are cooperatively disposed at both ends of the pull rod assembly, a limiting assembly is disposed at an end of each fixed tube <NUM>, the limiting assembly is connected to the underframe <NUM>, the pull rod assembly can be overturned when being drawn outwards relative to the fixed tubes <NUM> to the extent that the pull rod assembly abuts against the ends of the fixed tubes <NUM>, the limiting assemblies are in a limiting fit with the pull rod assembly overturned upwards, and at the same time, through a warp motion, the roller wheels <NUM> at the bottom of the underframe <NUM> are downwards exposed out of the outer frame <NUM> to abut against the ground, so as to achieve the movement of the base.

Specifically, the pull rod assembly includes a pull rod <NUM>, guide rods <NUM> are disposed at both ends of the pull rod <NUM>, and the guide rods <NUM> are disposed in the fixed tubes <NUM> and can be drawn to move along the fixed tubes <NUM>. The guide rod <NUM> includes a convex groove <NUM> that is opened at the bottom, snapping members <NUM> are disposed on both sides of the top of one end of the convex groove <NUM> that is away from the pull rod <NUM>, an inner guide rod is disposed in the convex groove <NUM>, and the inner guide rod is fixed to a corner connector <NUM> at one end, and provided with a top member <NUM> and a pulley <NUM> that drives the guide rod <NUM> to move along a bottom wall of the fixed tube <NUM> at the other end. The limiting assembly includes a supporting member <NUM> disposed between the fixed tube <NUM> and the underframe <NUM>, the supporting member <NUM> is provided with a limiting slot <NUM> for the top member <NUM> and the pulley <NUM> to snap into at the top, and the fixed tube <NUM> is cooperatively provided with a notch at a position corresponding to the limiting slot <NUM>. In addition, the limiting assembly further includes a locking member <NUM> disposed in the fixed tube <NUM> and configured to cooperatively abut against the snapping member <NUM>.

Specifically, the upper frame <NUM> is an L-shaped frame, fixed on the top of the outer frame <NUM> at one end by fixing members <NUM>, and provided with a panel <NUM> on the top of the other end, and the pull rod assembly is disposed in an L-shaped end surface. In addition, a cross-shaped reinforcing frame <NUM> is disposed between the upper frame <NUM> and the underframe <NUM>, the upper surface of the cross-shaped reinforcing frame <NUM> is fixed to the panel <NUM>, and four legs are connected by inserting between the upper frame <NUM> and the underframe <NUM>. Tripods <NUM> are disposed at four corners of the underframe <NUM>, and the side walls of the tripods <NUM> are snapped and connected between the upper frame <NUM> and the underframe <NUM>, which is not only configured to improve a strength of connection between the supporting underframe <NUM> and the upper frame <NUM>, but also can provide a lateral support force for the supporting member <NUM> disposed on the underframe <NUM>.

As shown in <FIG>, a set of pull rod assemblies is oppositely disposed on an outer frame <NUM>. The pull rod assembly includes a pull rod <NUM>, where the pull rod <NUM> is a fan-shaped tube, and fan-shaped insert <NUM> ends of corner connectors <NUM> are fixed by inserting into tube openings at both ends, and convex insert <NUM> ends of the corner connectors <NUM> are connected to fixed tubes <NUM>. The fixed tube <NUM> is a square tube, fixed to the upper frame <NUM> at the bottom, and provided with two channel grooves parallelly inside, guide rods <NUM> are cooperatively disposed in the channel grooves, and the two guide rods <NUM> are disposed opposite to each other, fixed to the corner connectors <NUM> at one end, and provided with top members <NUM> at the other end. Specifically, as shown in <FIG>, the guide rod <NUM> includes a convex groove <NUM> that is opened at the bottom, an inner guide rod is disposed in the convex groove <NUM>, the inner guide rod is fixed to the corner connector <NUM> at one end, and provided with a connecting block at the other end, a bearing is disposed on the connecting block, the top member <NUM> and a pulley <NUM> that moves along a bottom wall of the fixed tube <NUM> are disposed on the bearing, and snapping members <NUM> are disposed on both sides of the top of the convex groove <NUM>. The pulley <NUM> is disposed at one end of the guide rod to realize the smooth movement of the guide rod <NUM> in the fixed tube <NUM>. As shown in <FIG>, the two guide rods <NUM> are disposed oppositely in the fixed tube <NUM>. The guide rod <NUM> in one channel groove at the junction of the fixed tube <NUM> and the corner connector <NUM> is fixed by inserting to the convex insert <NUM> of the connector <NUM>. The guide rod <NUM> is fixed to the convex insert <NUM> by a fastener <NUM> disposed on the top of the fixed tube <NUM>. And, at the bottom of the fixed tube <NUM> in this channel groove, a notch corresponding to the limiting slot <NUM> of the supporting member <NUM> is provided; and in the other channel groove, a blocking member <NUM> is provided. A locking member <NUM> is disposed on one side of the blocking member <NUM> that is adjacent to the guide rod <NUM>. The locking member <NUM> is not only configured to fix the blocking member <NUM>, but also can be pressed against the snapping member <NUM> at the end of the guide rod <NUM>, that is, when the locking member <NUM> abuts against the snapping member <NUM>, it means that an extractable part of the guide rod <NUM> has reached its limit. A contact surface of the snapping member <NUM> that is in contact with the locking member <NUM> is an arc-shaped groove, and through the locking member <NUM>, the snapping member <NUM> that is lifted up is snapped and fixed in a corresponding angle of the arc-shaped groove.

The principle of the movement of the sun umbrella base is as follows: the movable rods <NUM> are drawn out to both sides, that is, the guide rods <NUM> connected to the corner connectors <NUM> on both sides of the movable rods <NUM> move outward along the bottom walls of the fixed tubes <NUM>, until the snapping members <NUM> of the guide rods <NUM> in the channel grooves abut against the locking members <NUM> provided at the notches of the other channel grooves of the fixed tubes <NUM>, the movable rods <NUM> are lifted up, the top members <NUM> and the pulleys <NUM> on the guide rods <NUM> are snapped downward into the limiting slots <NUM> of the supporting members <NUM> through the notches at the bottom of the fixed tubes <NUM>, the angle is adjusted such that the locking members <NUM> are snapped and fastened in the arc-shaped grooves of the snapping members <NUM>, and at the same time, a downward force drives the supporting members <NUM> to act downward, and through a warp motion, the underframe <NUM> and the roller wheels <NUM> at the bottom of the underframe act downwards, and then the roller wheels <NUM> are exposed out of the outer frame <NUM> to abut against the ground, so as to achieve the movement of the base; and the guide rods <NUM> are pushed down, such that the locking members <NUM> leave from insides of the arc-shaped grooves of the snapping members <NUM>, the top members <NUM> at the ends of the guide rods <NUM> are drawn out of the limiting slots <NUM>, and then the supporting members <NUM> and the underframe <NUM> move upwards, and through a warp motion, the roller wheels <NUM> are made to enter the outer frame <NUM> upwards to be hidden, such that the outer frame <NUM> abuts against the ground, so as to achieve the fixation of the base.

In order to push the base more easily and stably, a set of pull rod assemblies is preferably provided in this embodiment.

A pull rod assembly is disposed on one side of the outer frame <NUM>. The pull rod assembly includes a pull rod <NUM>, guide rods <NUM> are disposed at both ends of the pull rod <NUM>, the guide rods <NUM> are disposed in the fixed tubes <NUM> and can be drawn to move along the fixed tubes <NUM>. The fixed tube <NUM> is a square tube, fixed to an upper frame <NUM> at the bottom, and provided with channel grooves inside, guide rods <NUM> are cooperatively disposed in the channel grooves, and the guide rods <NUM> are fixed to corner connectors <NUM> at one end, and provided with top members <NUM> at the other end. A locking member <NUM> disposed in the fixed tube <NUM> and configured to cooperatively abut against a snapping member <NUM>. The other structures are basically the same as those in Embodiment <NUM>, and will not be repeated here.

The principle of the movement of the sun umbrella base is as follows: the pull rods <NUM> are drawn out to both sides, that is, the guide rods <NUM> connected to the corner connectors <NUM> on both sides of the pull rods <NUM> move outward along the bottom walls of the fixed tubes <NUM>, until the snapping members <NUM> of the guide rods <NUM> in the channel grooves abut against the locking members <NUM> provided at the notches of the fixed tubes <NUM>, the movable rods <NUM> are lifted up, the top members <NUM> and the pulleys <NUM> on the guide rods <NUM> are snapped downward into the limiting slots <NUM> of the supporting members <NUM> through the notches at the bottom of the fixed tubes <NUM>, the angle is adjusted such that the locking members <NUM> are snapped and fastened in the arc-shaped grooves of the snapping members <NUM>, and at the same time, a downward force drives the supporting members <NUM> to act downward, and through a warp motion, the underframe <NUM> and the roller wheels <NUM> at the bottom of the underframe act downwards, and then the roller wheels <NUM> are exposed out of the outer frame <NUM> to abut against the ground, so as to achieve the movement of the base; and the guide rods <NUM> are pushed down, such that the locking members <NUM> leave from insides of the arc-shaped grooves of the snapping members <NUM>, the top members <NUM> at the ends of the guide rods <NUM> are drawn out of the limiting slots <NUM>, and then the supporting members <NUM> and the underframe <NUM> move upwards, and through a warp motion, the roller wheels <NUM> are made to enter the outer frame <NUM> upwards to be hidden, such that the outer frame <NUM> abuts against the ground, so as to achieve the fixation of the base.

Claim 1:
A comfortably movable sun umbrella base, comprising an outer frame (<NUM>), an underframe (<NUM>) being disposed in the outer frame (<NUM>), and roller wheels (<NUM>) being provided at the bottom of the underframe (<NUM>), wherein a pull rod assembly is disposed on at least one side of the outer frame (<NUM>), fixed tubes (<NUM>) are cooperatively disposed at both ends of the pull rod assembly, a limiting assembly is disposed at an end of each fixed tube (<NUM>), the limiting assembly is connected to the underframe (<NUM>), the pull rod assembly can be overturned when being drawn outwards relative to the fixed tubes (<NUM>) to the extent that the pull rod assembly abuts against the ends of the fixed tubes (<NUM>), the limiting assemblies are in a limiting fit with the pull rod assembly overturned upwards, and at the same time, through a warp motion, the roller wheels (<NUM>) at the bottom of the underframe (<NUM>) are downwards exposed out of the outer frame (<NUM>) to abut against the ground, so as to achieve the movement of the base.