Patent Application
20090007823
1. Field of the Invention
The present invention relates to a work table or a machine tool or a working machine, and more particularly to a work table including an adjustable supporting device for allowing the work table to be easily moved and to be stably supported on the ground or the supporting surface and to be suitably adjusted or leveled.
2. Description of the Prior Art
Typical work tables comprise a table body for supporting various machine tools or working machines, and for supporting various work pieces to be machined or operated or worked by the machine tools or working machines.
For example, U.S. Pat. No. 5,535,766 to Edwards discloses one of the typical transmission service benches comprising two wheels attached to one side of a table body, and two leveling screws attached to the other side of the table body, and a caster and a caster wheel provided in the middle portion of the table body for allowing the caster wheel and the wheels to support the weight of the service bench.
However, the caster and the caster wheel include a complicated structure that may increase the manufacturing cost of the service bench. In addition, the leveling screws may not stably support the service bench and will be engaged into the ground or will damage the floor.
U.S. Pat. No. 6,508,281 to Wang discloses another typical work table comprising four leveling screws attached to the corner areas of the table body for leveling purposes.
However, the typical work tables do not have wheels or caster wheels such that the typical work table may not be easily moved to the other places particularly when heavy machine tools or working machines are supported on the table body.
The present invention has arisen to mitigate and/or obviate the afore-described disadvantages of the conventional leveling devices for the work tables.
The primary objective of the present invention is to provide a work table including an adjustable supporting device for allowing the work table to be easily moved and to be stably supported on the ground or the supporting surface and to be suitably adjusted or leveled.
In accordance with one aspect of the invention, there is provided a work table comprising a housing for supporting a working machine thereon, the housing including a bottom portion having four corner areas, four leveling screws threaded and engaged with the corner areas of the housing respectively and adjustable relative to the housing, four lock nuts attached and engaged with the leveling screws respectively for engaging with the housing and for selectively securing the leveling screws to the housing at a selected position, four foot members attached to bottom of the leveling screws respectively, and the foot members each including a diameter greater than that of the leveling screw for stably engaging with a supporting surface and for stably supporting either of the corner areas of the housing on the supporting surface, and four wheel devices attached to each of the corner areas of the housing and disposed beside the leveling screws respectively, and each including a wheel member for selectively engaging with the supporting surface, either of the foot members of the leveling screws being selectively adjustable higher than bottom of the wheel member for allowing the wheel member to be engaged with the supporting surface and for allowing the housing to be moved to any required positions, the foot members of the leveling screws being selectively adjustable lower than bottom of the wheel members for elevating the wheel members and for separating the wheel members from the supporting surface and for stably supporting the housing on the supporting surface, and either of the foot members of the leveling screws being selectively adjustable relative to the wheel devices and the supporting surface for leveling the housing and for preventing the housing from being tilted relative to the supporting surface.
The housing includes four plates attached to the corner areas respectively for attaching the leveling screws and the wheel devices respectively.
The plates each include an orifice formed therein for engaging with the leveling screw and for allowing the leveling screw to be rotated and adjusted relative to the plate of the housing. The plates each include a fixed nut aligned with the orifice of the plate for threading with the leveling screw.
The wheel devices each include a base secured to the plate and each include two flaps extended downwardly therefrom for rotatably attaching the wheel member with an axle.
The leveling screws each include an enlarged head formed in bottom for attaching the foot members. The leveling screws each include a screw hole formed in the enlarged head for engaging with a fastener which secure the foot member to the enlarged head of the leveling screw.
Further objectives and advantages of the present invention will become apparent from a careful reading of the detailed description provided hereinbelow, with appropriate reference to the accompanying drawings.
Referring to the drawings, and initially to
A lock nut 21 may further be provided and attached to or engaged with each of the leveling screws 20 for engaging with the plates 13 of the housing 10 and for selectively and solidly securing the leveling screws 20 to the plates 13 of the housing 10 at the predetermined or selected position or location, and for allowing the leveling screws 20 to be rotated relative to the plates 13 of the housing 10 (
For example, a foot member 26 may be attached or secured to the lower or bottom portion 23 of each of the leveling screws 20 with the fastener 25, and includes an enlarged or greater outer diameter than that of the leveling screw 20 and/or the enlarged head 22 for providing an increased contact area with the supporting surface or the ground or the floor 88 and for stably supporting either of the corner areas 12 of the housing 10 on the supporting surface or the ground or the floor 88. One or more washers 27 (
A caster wheel or wheel device 30 is further provided and attached or engaged onto each of the plates 13 or onto each of the corner areas 12 of the housing 10 and disposed beside the leveling screw 20 respectively for selectively engaging with the supporting surface or the ground or the floor 88 (
For example, the wheel member 34 is rotatably engaged between the flaps 33 of each of the wheel devices 30 and rotatably attached or secured to the flaps 33 with an axle 35 for allowing the wheel devices 30 to be rotatably attached or secured to the plate 13 or to each of the corner areas 12 of the housing 10 and for allowing the wheel devices 30 to be selectively engaged with the supporting surface or the ground or the floor 88 (
In operation, as shown in
As shown in
As shown in
It is to be noted that the housing 10 includes four leveling screws 20 and four wheel devices 30 attached or secured to the plates 13 or to the corner areas 12 of the housing 10 respectively, for allowing either of the foot members 26 or either of the leveling screws 20 to be selectively moved or adjusted relative to the wheel devices 30 and/or the supporting surface or the ground or the floor 88, and for allowing either of the corner areas 12 of the housing 10 to be suitably leveled.
Accordingly, the work table in accordance with the present invention includes an adjustable supporting device for allowing the work table to be easily moved and to be stably supported on the ground or the supporting surface and to be suitably adjusted or leveled.
Although this invention has been described with a certain degree of particularity, it is to be understood that the present disclosure has been made by way of example only and that numerous changes in the detailed construction and the combination and arrangement of parts may be resorted to without departing from the spirit and scope of the invention as hereinafter claimed.
