MOBILE BASE DEVICE

DISPOSITIF DE BASE MOBILE

English Abstract

A mobile base device for a sun umbrella including a base cover. A bearing support is arranged inside the base cover and is hinged with a main lifting arm via a stiffened plate mounted thereon. An outer end of the main lifting arm is screwed to a lifting screw mounted on the bearing support via a lifting screw sleeve and an inner end of the main lifting arm is fixedly coupled to a set of secondary lifting arms through joints. A central portion of the set of secondary lifting arms is hinged with a set of stiffened plates mounted on the bearing support and a lower portion of the outer end of the set of secondary lifting arms is fixedly coupled to a set of casters. The lifting arms are hinged to the umbrella base via the bearing support and the lifting arms are enabled to move upwards or downwards by means of controlling the end of the main lifting arm by a handle and meanwhile allow the secondary lifting arms to drive the casters mounted thereon to drop or lift. Thus, the sun umbrella moves easily and rapidly when the casters touch the ground and the umbrella will be securely fixed when the casters lift and foot mats touch the ground. Such structure has the advantages of easy movement and fixation as well as practicality and convenience.

French Abstract

Un dispositif de base mobile pour un parasol comprenant un couvercle de base. Un support de palier est placé à lintérieur du couvercle de base et est articulé avec un bras élévateur principal à laide dune plaque rigide qui y est montée. Une extrémité extérieure du bras élévateur principal est vissée à une vis élévatrice montée sur le support de palier à laide dun manchon fileté élévateur et une extrémité intérieure du bras élévateur principal est couplée de manière fixe à un ensemble de bras élévateurs secondaires par lintermédiaire de joints. Une partie centrale de lensemble de bras élévateurs secondaires est articulée avec un ensemble de plaques rigides installées sur le support de palier et une partie inférieure de lextrémité extérieure de lensemble de bras élévateurs secondaires est couplée de manière fixe à un ensemble de roulettes. Les bras élévateurs sont articulés à la base du parasol par le support de palier et les bras élévateurs peuvent se déplacer vers le haut ou le bas au moyen dune commande de lextrémité du bras élévateur principal par une poignée et permettent en même temps aux bras élévateurs secondaires dentraîner labaissement ou lélévation des roulettes installées dessus. Ainsi, le parasol se déplace facilement et rapidement lorsque les roulettes touchent au sol et le parapluie sera solidement fixé lorsque les roulettes sélèvent et que les tapis de sol touchent le sol. Une telle structure possède les avantages dun mouvement et dune fixation faciles ainsi que laspect pratique et facile dutilisation.

Claims

CLAIMS
1. A mobile base device for supporting an umbrella, the umbrella having a
pole, the
mobile base device comprising a base cover (9), a bearing support (1), a main
lifting arm (10), a lifting screw (2), a lifting screw sleeve (6), a plurality
of
stiffened plates (la), a cross joint (14), a plurality of secondary lifting
arms (11),
and a plurality of casters (12), characterized in that
the bearing support (1) is arranged inside the base cover (9);
lower ends of the plurality of stiffened plates (la) axe fixedly mounted on
the bearing support (1);
upper ends of the plurality of stiffened plates (1a) are connected to one
another for receiving the pole;
a central portion of the main lifting arm (10) is pivotally connected to one
of the plurality of stiffened plates (1a);
an outer end of the main lifting arm (10) is screwed to the lifting screw (2)
mounted on the bearing support (1) via the lifting screw sleeve (6) and an
inner
end of the main lifting arm (10) is fixedly coupled to inner ends of the
plurality of
secondary lifting arms (11) through the cross joint (14);
central portions of the plurality of secondary lifting arms (11) are pivotally
connected to the plurality of stiffened plates (1a), respectively; and
lower portions of outer ends of the plurality of secondary lifting arms are
fixedly coupled to the plurality of casters (12), respectively.
2. The mobile base device according to claim 1, characterized in that an
upper
portion of the lifting screw (2) rotationally cooperates with the bearing
support (1)
via a bearing (5) and cooperates with the bearing (5) to clamp an elastic
collar for
a shaft (4) and the bearing (5) is arranged with a water seal ring (3).
3. The mobile base device according to claim 1, characterized in that a top
of the
lifting screw (2) is spliced with a handle (7).

4. The mobile base device according to claim 1, characterized in that a
bottom
portion of the bearing support (1) is fixedly coupled to a plurality of foot
mats
(13).
5. The mobile base device according to claim 1, characterized in that a
number of the
plurality of the stiffened plates (1a) is four,
6. The mobile base device according to claim 1, characterized in that the
casters (12)
are movable in all directions.
7. The mobile base device according to claim 1, characterized in that a
plurality of
saddle weights (8) is arranged inside the beating support (1) and each of the
plurality of stiffened plates (1a) is located between two adjacent saddle
weights
(8).
8. The mobile base device according to claim 1, characterized in that a top
of the
bearing support (1) and the base cover (9) are fixedly coupled to a foot tube
(16)
by screws; and an upper base cover (15) is sleeved on the foot tube (16) to
cover
the screws.
8

Description

CA 02759944 2011-11-30
MOBILE BASE DEVICE
FIELD OF THE INVENTION
[0001] The invention relates to the field of a sun umbrella, and more
particularly to a mobile base device for a sun umbrella.
BACKGROUND OF THE INVENTION
[0002] Conventionally, a base of a sun umbrella is an integrated structure
which further comprises an upper pole and canopy fixedly coupled thereto.
Therefore, when the sun umbrella requires moving, it must be moved as a
whole. Due to a large size and heavy weight of the umbrella, the process is
highly inconvenient and time and labor consuming.
SUMMARY OF THE INVENTION
[0003] In view of the above-described problems, it is one objective of the
invention to provide a mobile base device for a sun umbrella with
convenient movement and fixation.
[0004] To achieve the above objective, in accordance with one
embodiment of the invention, there is provided a mobile base device
comprising a base cover, wherein a bearing support is arranged inside the
base cover, the bearing support is hinged with a main lifting arm via a
stiffened plate mounted thereon, one outer end of the main lifting arm is
screwed to a lifting screw mounted on the bearing support via a lifting screw
sleeve and one inner end of the main lifting arm is fixedly coupled to a set
of
secondary lifting arms via joints, a central portion of the set of secondary
lifting arms is hinged with the stiffened plate mounted on the bearing
support, and a lower portion of an outer end of the set of secondary lifting
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arms is fixedly coupled to a set of casters.
[0005] The mobile base device is characterized in that an upper portion of
the lifting screw rotationally cooperates with the bearing support via a
bearing and cooperates with the bearing to clamp an elastic collar for shaft
and the bearing is arranged with a water seal ring.
[0006] The mobile base device is characterized in that a top of the lifting
screw is spliced with a handle.
[0007] The mobile base device is characterized in that a bottom portion of
the bearing support is fixedly coupled to a set of foot mats.
[0008] The mobile base device is characterized in that the inner end of the
main lifting arm is fixedly arranged with a cross joint, which is fixedly
coupled to four secondary lifting arms.
[0009] The mobile base device is characterized in that the casters are
universal.
[0010] The mobile base device is characterized in that a set of saddle
weights are arranged inside the bearing support and the stiffened plate is
located between two adjacent saddle weights.
[0011] The mobile base device is characterized in that the top of the
bearing support and the base cover are fixedly coupled to a foot tube by
screws. An upper base cover is sleeved on the foot tube to cover the
screws.
[0012] In accordance with the invention, the lifting arm is hinged to an
umbrella base via the bearing support and the lifting arm is able to move
upwards or downwards by means of controlling the end of the main lifting
arm by the handle, which allows the secondary lifting arm to drive the
casters mounted thereon to drop or lift. Thus, the sun umbrella moves
easily and rapidly when the casters touch the ground and can be securely
fixed when the casters lift and the foot mats touch the ground. Such
2

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structure has the advantages of easy movement and fixation as well as
practicality and convenience.
BRIEF DESCRIPTION OF THE DRAWINGS
[0013] FIG. 1 is a structural representation of a mobile base device of the
invention;
[0014] FIGS. 2-5 are exploded views of a mobile base device of the
invention; and
[0015] FIG. 6 is a structural representation of a mobile base device of the
invention used for a sun umbrella.
[0016] In the drawings, the following reference numbers are used: 1.
Bearing support; 1a. Stiffened plate; 2. Lifting screw; 3. Water seal ring; 4.
Elastic collar for shaft. 5. Bearing; 6. Lifting screw sleeve; 7. Handle; 8.
Saddle weight; 9. Base cover; 10. Main lifting arm; 11. Secondary lifting arm;
12. Caster; 13. Foot mat; 14. Cross joint; 15. Upper base cover; 16. Foot
tube.
DETAILED DESCRIPTION OF THE EMBODIMENTS
[0017] The invention is explained in further detail below with the aid of the
attached drawing.
[0018] As shown in FIG. 1, a mobile base device of the invention comprises
a base cover 9. A bearing support 1 having a set of foot mats 13 is arranged
inside the base cover 9. The bearing support 1 is hinged with a main lifting
arm 10 via a stiffened plate la mounted thereon. An outer end of the main
lifting arm 10 is screwed to a lifting screw 2 mounted on the bearing support
1 via a lifting screw sleeve 6 and an inner end of the main lifting arm is
fixedly coupled to a set of secondary lifting arms 11 through joints. Central
3

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portions of the set of secondary lifting arms 11 are hinged with the stiffened
plate 1a mounted on the bearing support 1 and a lower portion of the outer
end of the set of secondary lifting arms is fixedly coupled to a set of
casters
12.
[0019] The mobile base device of the invention employs the bearing
support Ito arrange the main lifting arm 10 and the secondary lifting arms
11 and enable the main lifting arm 10 and the secondary lifting arms 11 to
lift
or drop the casters 12 mounted at an outer end of the secondary lifting arms
11 so as to achieve movement and fixation of the sun umbrella.
[0020] In accordance with the invention, an upper portion of the lifting
screw 2 rotationally cooperates with the bearing support 1 via bearings 5
and cooperates with the bearings 5 to clamp an elastic collar for shaft 4.
Each of the bearings 5 is arranged with a water seal ring 3. Such structure
helps lubrication and sealing of the bearings and ensures smooth rotation of
the lifting screw 2 within the bearing seat hole of the bearing support 1. The
top of the lifting screw 2 cooperates with a handle 7, making it easier to
operate the lifting screw 2. An inner end of the main lifting arm 10 is
fixedly
arranged with a cross joint 14, which is fixedly coupled to four secondary
lifting arms 11 and the casters 12. Such structure is beautiful symmetrically
and more stable. The casters 12 are universal, allowing the sun umbrella to
be easily moved in every direction. A set of saddle weights 8 are arranged
inside the bearing support 1 and the stiffened plate 1a is located between
two adjacent saddle weights 8; the saddle weights 8 increase the weight
bearing of the base, making the sun umbrella more stable and not liable to
decline or tilt.
[0021] As shown in FIGS. 2-5, the mobile base device is mounted as
follows. The casters are aligned with four holes of the secondary lifting arms
11. Hexagon socket head cap screws are put on, and steel spacers and
outer hexagon screws are screwed to finish the installation of the secondary
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lifting arms. Press one of the bearings 5 into the bearing seat hole (lower
hole) of the bearing support 1, put on the lifting screw 2 and the elastic
collar for shaft 4, put another bearing 5 through the lifting screw 2, press
it
into the bearing seat hole (upper hole) of the bearing support 1 and put on
the elastic collar for shaft 4 and water seal ring 3. Put round head cross
screws through the foot mats 13 and a lower frame hole of the bearing
support and then screw on two outer hexagon nuts. Insert hexagon socket
head cap screws into the slot of the main lifting arm 10 and mount it on the
bearing support 1, put the lifting screw sleeve 6 into the slot (long hole
slot)
of the main lifting arm 10 and screw it with the lifting screw 2, put the
hexagon socket head cap screws mounted at the central portion of the main
lifting arm 10 through the stiffened plate 1a of the bearing support 1, adjust
the spacers, main lifting arm 10, friction spacers and the other stiffened
plate 1a and then put on steel spacers and screw on outer hexagon nuts.
Align the cross joint 14 with the holes and put it in the hexagon socket head
cap screws of the main lifting arm 10 and screw two outer hexagon screws;
insert the secondary lifting arm components into the center of the stiffened
plate 1a of the bearing support 1, align the central holes to allow the
hexagon socket head cap screws of the secondary lifting arms 11 pass
through the stiffened plate 1a of the bearing support 1, friction spacers,
secondary lifting arms 11 and the stiffened plate la (the other one) of the
bearing support 1, and then put on steel spacers and screw on outer
hexagon nuts; align the holes of the secondary lifting arms 11 to those of
the cross joint 14, put on the hexagon socket head cap screws and steel
spacers, screw on the outer hexagon screws and then adjust and tighten
the outer hexagon nuts mounted at the bottom of the cross joint 14; mount
four saddle weights 8 and cover the upper base cover 9 to finish the
assembly of the mobile base device.
[0022] As shown in FIGS 1-5, in use, the handle 7 is inserted into the
square hole located at the top of the lifting screw 2 and then the handle 5 is
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rotated anticlockwise (or clockwise) to drop (or lift) the lifting screw 6 to
enable the main lifting arm 10 and the secondary lifting arms 11 to make the
casters 12 move downwards (or upwards). When a sun umbrella is required,
users can rotate the handle 7 to drop the casters 12 and then push the
umbrella base to move when the foot mats 13 have an appropriate height
from the ground. When the base is at the intended position, rotate the
handle 7 to lift the casters 12, allowing the foot mats 13 to be fully against
the ground to fix the base.
[0023] As shown in FIG. 6, the top of the bearing support 1 and the base
cover 9 are fixedly coupled to the foot tube 16 by screws for mounting the
upper pole and canopy of the umbrella. An upper base cover 15 is sheathed
on the foot tube 16 to cover the screws. Such structure is simply and
beautiful.
6

Representative Drawing