JPH09140846A - Foldable ping-pong table - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a Ping-Pong table to be folded and opened safely by one person by erecting and supporting rods against a support supporting inner legs, and providing between a drive shaft and each rod a transmission mechanism which moves connecting links up and down through the back-and-forth rotation of the drive shaft. SOLUTION: To fold a Ping-Pong table, a handle 28 is rotated to rotate a driven gear 26 via a drive shaft 21 and a driving gear 27 to move the driven gear 26 downward along an external thread 19 on a rod 18. Then each connecting link 8 moves downward via a case 24 and an upper cross frame 20, and each inner link arm 9, 10 and each outer link arm 11, 12 push the approaching ends of top boards 2a, 2b downwards so that each top board 2a, 2b is curved about each inner leg 3 into a folding position. At the same time, each outer leg 7 is gradually rotated about a pin 7a toward the back of each top board 2a, 2b while being held in its vertical position by the action of a parallel link mechanism assisted by each connecting rod 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foldable table tennis table in which a top plate divided into right and left parts can be folded and stored in a valley shape when not in use.

[0002]

2. Description of the Related Art FIG. 7 shows a conventional technique. In FIG. 7, reference numeral 1 denotes a foldable table tennis table, in which the left and right divided top plates 2 (2a, 2b) are horizontally arranged by inner legs 3 and 3 on the approach side and outer legs 7 and 7 on the separation side. Each top plate 2, that is, the square-shaped left top plate 2a and right side top plate 2b is connected by a connecting link 8 so as to be valley-foldable. The inner legs 3 and 3 and the outer legs 7 and 7 are connected to the four corners of the left and right top plates 2a and 2b so as to be rotatable in the left and right directions via pins 3a and 7a. Of these, the lower ends of the inner legs 3, 3 are rotatably connected to a support base 4 via a pin 3b so that the support base 4 can be moved by wheels (casters) 5 attached to the left and right lower surfaces. To support.

The connecting link 8 is as follows. That is, the inner link arms 9 and 10 and the outer link arms 11 and 12 are respectively attached to the pins 9a and 1 at the approach-side ends of the top plates 2a and 2b located closer to the inner legs 3 and 3 than the inner legs 3 and 3, respectively.
0a, 11a, and 12a are rotatably connected in the left-right direction and hung down. The inner link arms 9 and 10 are crossed in an X shape, and the lower ends thereof are pinned to the left and right ends of the upper part of the plate-shaped bracket 13. The outer link arms 11 and 12 are rotatably connected in the left-right direction by 9b and 10b. The lower ends of the outer link arms 11 and 12 are connected to the lower end of the inner link arm 10 on the right side by the pin 11b, and the right part thereof. The lower end of the inner link arm 9 on the left side is rotatably connected to the left and right by pins 12b.

Further, connecting rods 15 and 15 are extended to the left and right ends of the lower portions of the outer legs 7 and 7 and the bracket 13 in parallel with the top plates 2a and 2b, and both ends thereof are provided with pins 15a ,.
It is connected so as to be rotatable in the left-right direction by 15b. The connecting link 8, the bracket 13, and the connecting rod 15 described above are provided on both sides of the top plate 2 (2a, 2b) in the front-rear direction.

When the folding table tennis table 1 is folded, the left end of the left top plate 2a and the right end of the right top plate 2b are lifted, and as shown in FIG. 2a and 2b are valley-folded and both are rotated until they become vertical.
By doing so, the top plates 2a and 2b face each other and stand upright in a vertical manner, and the outer legs 7 and 7 are rotated by the connecting rods 15 along the back surfaces of the top plates 2a and 2b standing upright. The folding table tennis table 1 is folded and the whole is supported by the wheels 5 via the support table 4.

[0006]

SUMMARY OF THE INVENTION In the above-mentioned conventional apparatus, when folding or opening a folded table tennis table, the left end portion of the left top plate 2a and the right end portion of the right top plate 2b are used. With these, they must be simultaneously rotated upward or downward at the same speed, and one person cannot fold or open them. Also, even when performed by multiple people, if the movement of each person becomes uneven, it can be folded smoothly,
You can't open it. In addition, there is a defect that when a lateral load is applied during movement after folding, it may be opened carelessly, and safety is poor. It is an object of the present invention to obtain a novel folding table tennis table which eliminates the above drawbacks.

[0007]

Means for Solving the Problems In order to achieve the above object, the present invention is configured as follows. That is, the rectangular top plates divided into the left and right are brought close to each other, and each top plate is supported by the inner leg and the outer leg that are rotatably provided on the approaching side and the separating side. A support base that rotatably connects the lower ends of the top and left top plates is rotatably hung from the end of each top plate on the approach side, and the lower ends of the link arms can be turned. In a foldable table tennis table that is connected in a valley foldable manner by a connecting link composed of a bracket that is connected to a rod, the rod is erected and supported on the support table and extends horizontally in the bracket side of the connecting link to intersect with the rod. A drive shaft is provided, and a transmission mechanism is provided between the drive shaft and the rod for vertically moving the connecting link by the forward and reverse rotation of the drive shaft.
In this case, the transmission mechanism may be configured such that a male screw is formed on the outer circumference of the rod, the driven gear is screw-fitted to the male screw, the rod is provided with a drive gear, and the drive gear is meshed with the driven gear. . Further, the connecting links are provided on both sides of the approach side end of each top plate, and the brackets of each connecting link are connected by a cross frame that crosses under each top plate. A rod vertically supported on a support base is inserted through the rod so as to be vertically movable, and a drive shaft rotatably supported by the cross frame is provided so as to extend in the longitudinal direction of the cross frame, and between the drive shaft and the rod. It is preferable to provide a transmission mechanism that moves the cross frame up and down by the forward and reverse rotations of the drive shaft. Further, one end of the drive shaft may be projected outward from the top plate, and a handle may be provided at the projecting end.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. In the drawings, FIG. 1 is a front view of a folding table tennis table showing an embodiment of the present invention, FIG. 2 is a right side view with a part thereof broken, FIG. 3 is a front view in a folded state, and FIG. It is a front view which shows the state of. It should be noted that, of the reference numerals attached to FIGS. 1 to 4, the portions having the same reference numerals as those in FIG. 7 have substantially the same structure as that in FIG. 1 to 4, reference numeral 17 denotes a lower cross frame made of a steel plate that connects the front and rear support bases 4 and 4. As shown in FIG. 5, the lower cross frame is a channel type having an open upper surface. The rods 18 are erected and fixed at the center of the lower cross frame 17 in the left-right and front-rear (left and right in FIG. 2) directions. This rod 1
No. 8 has a male screw 19 formed on the outer circumference over its entire length.

Further, the brackets 13 and 13 of the front and rear connecting links 8 and 8 for connecting the left and right top plates 2a and 2b are formed by the front and rear surfaces of the upper cross frame 20 which crosses the lower parts of the top plates 2a and 2b in the front and rear direction. Are welded or bolted together. As shown in FIG. 6, the upper cross frame 20 is formed in an elongated groove shape having an open upper surface,
The above-mentioned rod 18 is inserted through the central portion in the front-rear direction (left and right in FIG. 2). A drive shaft 21 is extendedly arranged in the front-rear direction in the upper cross frame 20, a front end 21a of the drive shaft 21 is provided on the front bracket 13, and a rear end 21b thereof is provided at the center of the upper cross frame 20 in the front-rear direction.
The case 24 is rotatably supported.

The transmission mechanism 23 moves the connecting link 8 up and down by the forward and reverse rotations of the drive shaft 21, and is as shown in FIGS. 5 and 6. That is, a box-shaped case 24 is fixed to the center of the upper cross frame 20 in the front-rear direction, and a driven gear 26 made of a helical gear is rotatably mounted in the case 24 via a thrust bearing 25. The driven gear 26 is connected to the rod 18
The male screw 19 formed on the outer periphery of the is screw-fitted. on the other hand,
A drive gear 27 composed of a helical gear is fixed to the rear end 21b (right end in FIG. 6) of the drive shaft 21, and the drive gear 27 is meshed with the driven gear 26. Further, the front end 21a of the drive shaft 21 is projected forward from the bracket 13 on the front side, and the handle 28 is detachably attached to this protruding end. Then, by rotating the handle 28 in the normal and reverse directions, the driven gear 26 is rotated in the normal and reverse directions via the drive shaft 21 and the drive gear 27, and the connecting links 8 are vertically moved through the case 24 and the upper cross frame 20. To move.

Next, the usage of the above embodiment will be described. First, when folding, the handle 28 is rotated in one direction, for example, rightward. By the way, the drive shaft 21, the drive gear 27
The driven gear 26 is rotated clockwise through the
Moves downward along the male screw 19 of the rod 18. When the driven gear 26 moves downward, the connecting links 8 move downward via the case 24 and the upper cross frame 20, and as shown in FIG. 4, the inner link arms 9 and 10 and the outer link arms 11 are moved. , 12 push down the approach-side ends of the top plates 2a, 2b downward, and the top plates 2a, 2b bend in a valley shape centering on the inner legs 3, 3. At the same time, each outer leg 7, 7 is rotated by the action of the parallel link mechanism by each connecting rod 15, 15 while gradually maintaining the vertical state and centering around the pins 7a, 7a toward the back side of each top plate 2a, 2b. Be moved.

When each connecting link 8 descends to the maximum,
As shown in FIG. 3, the top plates 2a and 2b face each other vertically with a predetermined space therebetween, and the outer legs 7 and 7 are supported in a state of being overlapped with the back surfaces of the top plates 2a and 2b. It is supported by the table 4 and the folding is completed. Next, the above-mentioned folded top plate 2
When opening a and 2b, the handle 28 is rotated in the opposite direction. By doing so, the driven gear 26 is rotated counterclockwise via the drive shaft 21 and the drive gear 27, and moves upward along the male screw 19, and each connecting link 8 moves upward through the case 24 and the upper cross frame 20. To do. As a result, the respective top plates 2a and 2b rotate outwardly about the inner legs 3 and 3, and the outer legs 7 and 7 gradually move around the pins 7a and 7a to the back surfaces of the top plates 2a and 2b. Then, the top plates 2a and 2b are horizontally opened as shown in FIG.

In this case, the top plates 2a, 2b are always engaged with the rod 18 via the connecting links 8, 8, the upper cross frame 20, and the transmission mechanism 21, so that the folding operation or the expansion is performed. The top plates 2a and 2b do not open accidentally during operation or during transportation after folding. The transmission mechanism 23 described above has a rack formed on one side surface of the rod 18, and a pinion is attached to the drive shaft 21.
The pinion may be meshed with the rack.

[0014]

As is apparent from the above description, according to the present invention, the rod is erected on the support base for supporting the inner legs, and the rod crosses the bracket side of the connecting link that connects the respective top plates so as to be openable and closable. Since the drive shaft is provided, and the transmission mechanism is provided between the rod and the drive shaft for moving the connecting link up and down by the forward and reverse rotations of the drive shaft, the table tennis table can be folded or expanded independently. There is an effect that can be performed safely.

[Brief description of the drawings]

FIG. 1 is a front view of a folding table tennis table showing an embodiment of the present invention.

FIG. 2 is a right side view with a part broken away.

FIG. 3 is a front view of a folded state.

FIG. 4 is a front view showing a state during folding.

FIG. 5 is a cross-sectional front view of an essential part showing a conduction mechanism part.

FIG. 6 is a cross-sectional side view of an essential part showing a conduction mechanism part.

FIG. 7 is a front view showing a state in the middle of folding showing a conventional example.

[Explanation of symbols]

 1 Folding Table Tennis Table 2 Top Plate 2a Left Top Plate 2b Right Top Plate 3 Inner Legs 3a, 3b Pins 4 Supporting Stand 5 Wheels 7 Outer Legs 7a Pins 8 Connecting Links 9, 10 Inner Link Arms 9a, 9b, 10a, 10b Pin 11, 12 Outer link arm 11a, 11b, 12a, 12b Pin 13 Bracket 15 Connecting rod 15a, 15b Pin 17 Lower cross frame 18 Rod 19 Male screw 20 Upper cross frame 21 Drive shaft 21a Front end 21b Rear end 23 Transmission device 24 Case 25 Thrust bearing 26 Driven gear 27 Drive gear 28 Handle

Claims (4)

[Claims] 1. A square-shaped top plate 2a, 2 divided into left and right.
b close to each other, and each top plate (2a, 2b)
Is supported by an inner leg (3) and an outer leg (7) rotatably provided on the approaching side and the distant side, respectively, and a lower end portion of each inner leg (3) is rotatably connected. (4) is provided, and the left and right top plates (2a, 2b) are rotatably hung from the approach-side ends of the top plates (2a, 2b) and the lower ends of the link arms are rotated. Brackets that can be connected (1
In the folding table tennis table, which is connected so as to be valley-foldable by a connection link (8) including the support table (4).
The rod (18) is erected and supported on the connecting link (8).
To the bracket (13) side of the rod (1
8) is provided with a drive shaft (21) intersecting the drive shaft (2)
A foldable table tennis table characterized in that a transmission mechanism (23) for moving the connecting link (8) up and down is provided between the rod (18) and the rod (18) by forward and reverse rotations of the drive shaft (21). 2. The transmission mechanism (23) comprises a rod (1).
8) A male screw (19) is formed on the outer periphery of this male screw (1)
9) Screw the driven gear (26) to the drive shaft (2)
The folding table tennis table according to claim 1, wherein a drive gear (27) is provided in (1) and the drive gear (27) is meshed with the driven gear (26). 3. The top plate (2a, 2a,
Provided on both sides of the approaching side end of 2b), each connecting link (8)
The brackets (13) are connected to each other by a cross frame (20) that traverses under the respective top plates (2a, 2b), and is erected on the support base (4) at an intermediate portion in the longitudinal direction of the cross frame (20). The drive shaft (21) rotatably supported by the cross frame (20) is provided by inserting the rod (18) vertically movable and extending in the longitudinal direction of the cross frame (20). A transmission mechanism (2) for vertically moving the cross frame (20) between the shaft (21) and the rod (18) by rotating the drive shaft (21) forward and backward.
The foldable table tennis table according to claim 1 or 2, further comprising 3). 4. The top plate (2) is attached to one end of the drive shaft (21).
The foldable table tennis table according to claim 1, 2 or 3, characterized in that the handle (28) is provided at the protruding end while projecting outward from (a, 2b).