Movable table stand

Abstract

A movable table stand is mainly composed of a table stand and two locking members. The table stand includes four corner plates, four adjustable restrictive rods, two direction-free wheels and two auxiliary wheels set at preset positions. Each of the corner plates is formed integral, able to avert mistakes of secondary machining and enforce the whole strength. The locking members are respectively set at a preset position at two sides of the table stand and controlled to keep the table stand locked or unlocked by treading with a foot. Being independent from locking system, the direction-free wheels and the auxiliary wheels can be processed mechanically and simply, reducing cost and increasing marketing competition.

Description

BACKGROUND OF THE INVENTION

1. Field of the Invention

This invention relates to a movable table stand, particularly to one including four corner plates formed respectively integral for enforcing the whole strength and locking members independent from wheels, reducing machining complexity.

2. Description of the Prior Art

Common conventional movable stand, as shown in FIG. 1, is mainly provided with four corner plates 1, four adjustable fixing rods 2, two direction-free wheels 3 and two auxiliary wheels 4. Each of the corner plates 1 is formed of several plates welded together. The adjustable fixing rods 2 are respectively connected with one side of two corner plates 1, assembled together with the corner plates to form a table stand. The direction-free wheels 3 and the auxiliary wheels 4 are set at preset positions around the table stand, enabling the table stand to move freely with a load on it. Additionally, the auxiliary wheel 4 is provided with a brake 5 so as to keep the table stand stopped steadily when the brake 5 is treaded by a foot. But, such a table stand, after having been used for a period of time, is easily damaged because of the degrading of the strength of the corner plates 1. Also, because each of the corner plates 1 is formed of several plates, welding work is extra needed to finish it, increasing the manufacturing cost. And, the brake 5 of the auxiliary wheel 4 has to be pushed manually with a great force when the table stand is wanted to move, causing a very inconvenient operation. So this invention has been devised to improve the defects mentioned above.

SUMMARY OF THE INVENTION

The prime object of this invention is to offer a movable table stand with a better structure.

The main characteristics of the invention are two locking devices provided in a table stand. The table stand includes four corner plates, four adjustable restrictive poles, two direction-free wheels and two auxiliary wheels. Each of the corner plates is composed of a triangular bottom plate and two side plates extended up vertically from two sides of the bottom plate and formed integral, able to enforce the strength and save a secondary machining process and reduce the cost for competition in marketing. The locking members are respectively set at a preset position at two front sides of the table stand and independent from four wheels set around the table stand, with the manufacturing cost possible to be reduced. In addition, being controlled to keep the table stand locked or unlocked by treading with a foot, the locking members can be operated easily.

BRIEF DESCRIPTION OF DRAWINGS

This invention is better understood by referring to the accompanying drawings, wherein:

FIG. 1 is perspective view of a conventional movable stand;

FIG. 2 is a perspective view of a preferred embodiment of a movable table stand in the present invention;

FIG. 3 is a partial exploded perspective view of the preferred embodiment of a movable table stand in the present invention;

FIG. 4 is a perspective view of the material of a gusset in the preferred embodiment of a movable table stand in the present invention;

FIG. 5 is a perspective view of a locking member of the preferred embodiment in the present invention, showing it in an unlocking condition;

FIG. 6 is perspective view of the locking member of the preferred embodiment in the present invention, showing the locking member in a locked condition; and

FIG. 7 is a perspective view of the locking member of the preferred embodiment in the present invention, showing the locking member recovered from the locked condition to the unlocked condition.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

As shown in FIGS. 2 and 3, a preferred embodiment of a movable table stand in this present invention includes mainly a table stand 10 and two locking devices 20.

The table stand 10 is composed of four corner plates 11, four adjustable restrictive rods 12, two direction-free wheels 13 and two auxiliary wheels 14.

The cover plate 11, as shown in FIG. 4, possesses a triangular bottom plate 111 and two sideboards 112 extending up vertically from two sides of the bottom plate 111. There are a preset number of fixing blocks 113 pressed at the conjunction of the bottom plate 111 and each side plate 112. The top of each side plate 112 is pressed to form a fixing groove 114. A fixing hole 115 is bored at a preset position of each side board 112, to be threadably engaged with a quick disassembling bolt 15, which is composed of a fixing bar 151, an elastic spring 152, a sleeve 153 and a washer 154. A restrictive flange 155 is formed at a preset position in the intermediate portion of the fixing bar 151. The elastic spring 152 is to be fitted restricted around the fixing bar 151. Next, the fixing bar 151 is inserted into the sleeve 153, with the elastic spring 152, which is stopped by the restrictive flange 155, and simultaneously confined in the sleeve 153. Finally, the outer portion of the fixing bar 151 is screwed together with the washer 154, keeping the fixing bar 151 confined in the sleeve 153 completely.

The adjustable restrictive rod 12 bored with a preset number of fixing holes 121 corresponding to the quick disassembling bolt 15 is to be put in the inner side of the fixing block 113 and the fixing groove 114 of the corner plate 11.

The direction-free wheels 13 are respectively screwed pivotally at a preset front position of the corner plate 11 at the front portion of the table stand 10.

The auxiliary wheels 14 are respectively screwed pivotally at a preset position beside the corner plate 11 at the rear portion of the table stand 10.

The locking members 20 are fixed respectively at a preset position beside the corner plate 11 at the front portion of the table stand 10, consisting of a bottom base 21, a pedal 22, a restrictive plate 23, a fixing base 24 and an outer cover 25 respectively.

The bottom base 21 is fixed at a preset position of the corner plate 11, with the pedal 22, the restrictive plate 23 and the fixing base 24 orderly connected pivotally with its outer side, and a fixing pivot 211 is fixed upright on the bottom base 21 in an intermediate portion.

The pedal 22 has a pedal plate 221 extending from its rear end and formed with an arced surface 222 formed at an underside of its front-end section set with a restrictive projection 223 at a preset position. In addition, the pedal 22 is bored with a pivotal hole 224 in the front end section at a preset position for fitting with a double-head rivet 225 to be pivotally connected with the bottom base 21. The double-head rivet 225 is matched with a twisting spring 226 fixed at the pedal 22 with its one end and the bottom base 21 with the other end.

The restrictive plate 23 is provided with a fixing groove 231, corresponding to the fixing pivot 211 of the bottom base 21, and a locking surface 232 projecting on its upper side. In addition, the restrictive plate 23 is extended sidewise from its front to form a slope 233 and bored with a pivotal hole 234 at its rear end for fitting with a double-head rivet 235 to be pivotally connected with the bottom base 21. The double-head rivet 235 is matched with a torsion spring 236 fixed at the restrictive plate 23 with its one end and the tail of the bottom base 21 with the other end.

The fixing base 24 is bored with a pivotal hole 241 at its front end for fitting with a double-head rivet 242 to connect pivotally with the bottom base 21. The double-head rivet 242 is matched with a torsion spring 236 fixed at the fixing base 24 with its one end and the bottom base 21 with the other end. In addition, from the bottom of the fixing base 24 is extended outwards and vertically a flat fixing plate 244 for fitting with a braking block 246 screwed together with a screw nut 245 at two sides of the fixing base 24 respectively.

The outer cover 25 is to be covered on the pedal 22, the restrictive plate 23 and the fixing base 24 and riveted with the two double-head rivets 225 and 235 of the pedal 22, the restrictive plate 23 and the fixing base 24.

In using, as shown in FIGS. 2 and 3, the bottom plate 111 and the side plate 112 of each corner plate 11 are formed integral as one unit, providing a large strength for heavy loading. The direction-free wheels 13 can be moved in a controlled direction. As shown in FIGS. 5 and 6, they depict how the movable table stand in this invention is stopped steadily by the brake. First, the pedal 22 of each fixing member 20 must be treaded by foot to enable the arced surface 222 at the bottom of the pedal 22 to rotate against the double-head rivet 225 and the torsion spring 225, then, to be compressed to sustain a rebounding force. By this time, the arced surface 222 is to enable the fixing base 224 beneath it to rotate against the double-head rivet 242 and the torsion spring 243 to be compressed to sustain a rebounding force. The fixing base 24, after being rotated, is to keep the braking block 246 moved downwards so as to lift up the direction-free wheel 13 from the ground and stay steadily and immovable on the ground. Simultaneously, the restrictive projection 223 of the pedal 22 is to move along the locking surface 232 of the restrictive plate 23, which is to rotate downwards against the double-head rivet 235 so as to compress the torsion spring 236 to sustain a rebounding force. When the restrictive projection 223 moves over the locking surface 232, it will be restricted by the locking surface 232 and the slope 233, achieving a steady stopping for the movable table stand in this invention.

On the contrary, as shown in FIG. 7, if the movable table stand is to be moved, the pedal 22 must be treaded by foot to enable the restrictive projection 223 of the pedal 22 to move ahead slightly to the tip of the slope 233 of the restrictive plate 23 and further into the inner side of the slope 233. By this time, because of the loosening of the torsion spring 236, the restrictive plate 23 will rebound back to stay stopped owning to the fixing pivot 211 of the bottom base 21 fitting in and restricting the fixing groove 231. Then, the pedal 22, being no more restricted by the restrictive plate 23, will rebound because of the loosening of the torsion spring 226. Next, the fixing base 24 will as well rebound with its own rebounding force, enabling the braking block 246 to rise up from the ground and the wheels 13 to touch the ground and able to move.

Finally, the advantages of the movable table stand are listed as below:

1. Each of the corner plates 11 is formed as an integral unit, enforcing its strength, averting any mistake caused by secondary machining and to reduce the cost, enhancing practicality and marketing competition.

2. Each of the locking members 20 is set at a preset position independently, able to reduce the machining complexity for the direction-free wheel 13 and the auxiliary wheel 14, and is to control stopping and moving actions by direct treading with foot providing a convenient operation.

While the preferred embodiment of the invention has been described above, it will be recognized and understood that various modifications may be made therein and the appended claims are intended to cover all such modifications that may fall within the spirit and scope of the invention.

Claims

1. A movable table stand comprising:

a table stand having four corner plates, four adjustable restrictive poles, two direction-free wheels and two auxiliary wheels; each said corner plate possessing a triangular bottom plate and two side plates extending up vertically from two sides of said bottom plate, plural fixing blocks pressed at the conjunction of said bottom plate and each of said side plates, each said side board pressed to form a fixing groove at its top and bored with a fixing hole at a preset position for fitting with a quick disassembling bolt; each said adjustable restrictive rod bored with a preset number of fixing holes corresponding to said quick disassembling bolts and to be put in the inner side of said fixing block and said fixing groove of said corner plate; said direction-free wheels respectively screwed pivotally at a preset front position of said corner plates at the front portion of said table stand; said auxiliary wheels respectively screwed pivotally at a preset position beside said corner plates at the rear portion of said table stand;

two locking members fixed respectively at a preset position beside said corner plates at the front portion of said table stand and respectively having a bottom base, a pedal, a restrictive plate, a fixing base and an outer cover;

said bottom base fixed at a preset position of said corner plate, said pedal, said restrictive plate and said fixing base orderly and pivotally connected with an outer side of said bottom base, a fixing pivot fixed at a preset position sidewise on said bottom base;

said pedal having pedal plate extending from its front end and an arced surface formed at its rear end and set with a restrictive projection at a preset position and bored with a pivotal hole at a preset position for fitting in with a double-head rivet for connecting pivotally with said bottom base, said double-head rivet matched with a torsion spring fixed at said pedal with its one end and said bottom base with the other end;

said restrictive plate having a fixing groove corresponding to said fixing pivot of said bottom base and provided with a locking surface at its upper side, a slope extending sidewise from its front and a pivotal hole bored at its end for fitting with a double-head rivet for connecting pivotally with said bottom base, said double-head rivet matched with a torsion spring fixed at said restrictive plate with its one end and the tail of said bottom base with the other end;

said fixing base bored with a pivotal hole at its front end for fitting in with a double-head rivet for connecting pivotally with said bottom base, said double-head rivet matched with a torsion spring fixed at said fixing base with its one end and said bottom base with the other end, said fixing base having a fixing plate extending outwards and vertically on its bottom for fitting with a braking block screwed together with a screw nut at two sides of said fixing base respectively; and,

said outer cover covered on said pedal, said restrictive plate and said fixing base and riveted with each of said two double-head rivets of said pedal, said restrictive plate and said fixing base.

2. A movable table stand as claimed in claim 1, wherein said quick disassembling bolt is composed of a fixing bar, an elastic spring, a sleeve and a washer; said fixing bar has a restrictive flange in the intermediate portion, said elastic spring is fitted around said fixing bar that is successively inserted into said sleeve, so that said elastic spring, being stopped by said restrictive flange, is confined in said sleeve, and the outer portion of said fixing bar is screwed together with said washer.