JPH0142638Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial field of application) This invention relates to a caster device for a telescopic gate or the like.

(Prior Art) Conventionally, this type of intermediate caster device, such as Japanese Utility Model Application Laid-open No. 58-1616093 and Japanese Utility Model Application Publication No. 59-8499, has a link that protrudes further downward from the pivot point at the bottom of the link material. A telescoping gate with casters attached to the lower end of the timber is disclosed.

In addition, Japanese Utility Model Application Publication No. 51-40028 discloses a bogie track of a U-shaped steel rail in which wheels are pivoted on both sides of a bogie attached to the lower ends of link rods that are telescopically connected, and the wheels are buried in the ground. A telescoping shelf is disclosed which is rotatably fitted into a moving chamber and run, and whose link rods are telescopically opened and closed.

(Problem to be solved by the invention) However, in the former case, when the telescoping gate is opened and closed, the inclination angle of the link material that makes up the gate changes, so the caster attached to the lower end also changes from the link material. As the slope changes, the telescoping gate tilts and lifts off the guide rail, which puts the weight of the telescoping gate on the connections with the pillars at both ends, causing premature wear or deformation of the connections, so the telescoping gate cannot move straight. There were problems in that opening and closing operations could not be performed smoothly, such as the opening and closing operations being difficult to obtain and meandering. In addition, in the latter case, wheels are attached to both sides of the cart in a direction perpendicular to the direction of telescopic movement of the telescoping shelf, so the wheels roll into the cart's orbiting chamber of the U-shaped steel rails buried in the ground. If it is not fitted freely,
Telescoping shelves meander or tilt and wobble during telescoping movements, making it impossible to open and close them smoothly.The structure is complex, and the construction work is time-consuming. There are problems such as mud flowing into the bogie track chamber of the rail and foreign matter such as dust accumulating, making it impossible for the wheels to run smoothly.

Furthermore, these types of gates do not have drop bars attached to them, so it is not possible to secure the telescopic gate.

Therefore, in view of the above-mentioned problems of the conventional technology, this invention is an attempt to solve them all at once, and it prevents the casters from lifting up when opening and closing the telescoping gate, and evenly distributes and supports the weight of the telescoping gate.
To provide a caster device which can operate lightly and smoothly and can also securely fix a telescopic gate by a drop rod attached to the telescopic gate.

(Means for Solving the Problem) As a means to achieve this, this invention connects link members arranged in front and back with inclinations in opposite directions in a flexible manner by crossing each other, and a predetermined link member In a retractable gate door in which casters are attached to the lower part of the door via a pedestal, the pedestal is formed with an upwardly projecting protrusion for pivoting the link material, and the lower ends of the link members facing each other in the front and back are attached to both sides of the protrusion. The casters are rotatably attached to the lower side of the pedestal, separated from each other in the direction of expansion and contraction of the telescoping gate across the pivot axis line, and are provided with casters at different positions in the depth direction of the telescoping gate. A drop rod that can be moved up and down is inserted into the pedestal.

(Example) An example of a specific configuration of this invention shown in the drawings will be described in detail below.

The link materials 1 are hollow rod-shaped bodies made of aluminum or the like, and are appropriately formed into a straight line or a curved shape such as a gentle S-shape. The central portions of the two parts are rotatably connected by a shaft 2. In addition, the upper and lower ends of each link member 1 are inclined in opposite directions and are arranged opposite to the upper and lower ends of the adjacent link member 1, and both are rotatably connected by a connecting cap 3 to form a telescopic gate. A is constructed so that it can be opened and closed. Reference numeral 4 denotes a caster device, which is attached to the lower end of the link member 1 located in the middle of the telescopic gate A. This caster device 4 consists of a pedestal 5, a caster 6, a link material cap 7, and a drop rod 8. A shaft 14 attached by a shaft 15 is provided protrudingly, and arms 10 are bent in a dogleg shape in directions away from each other so as to cross the axis of the shaft 14 in the horizontal direction below both side walls. A screw hole 11 is bored at the tip to pass through in the vertical direction. The caster 6 has a wheel 17 rotatably attached to the lower end of a screw rod 16 at an eccentric position as is well known, the screw rod 16 is screwed into the screw hole 11, and the height is fixed with an adjusting nut 18. Link material cap 7
is a short hollow cylindrical body with a bottom, and the shaft 14 is inserted into a bearing hole 19 bored on the side surface with a washer 21 interposed therebetween, and a flat washer 22 and an E-ring 23 are attached to the tip of the shaft 14. are fitted to rotatably connect the link material cap 7. Further, the upper half of the link material cap 7 has a fitting portion 20, into which the lower end of the link material 1 is fitted and fixed with screws 24 to connect the two. The drop bar 8 has a knob 2 on the top end.
5. A stopper 26 protruding toward the lower end, with a ring-shaped retaining groove 27 above the stopper 26, which is slidably inserted into the vertical hole 12 bored in the center of the base 9 of the pedestal 5; Insert the ball 28 and spring 29 into the hole 13 drilled in the side wall of the holder 3.
0, the tension of the spring 29 urges the ball 28 to come into contact with the drop bar 8, and the push bar 8 moves upward, causing the ball 28 to enter the locking groove 27.
When the two are fitted together, the drop rod 8 is held in a raised state.

Note that 31 indicates a tip caster.

With this structure, when the telescopic gate A is opened and moved, for example, in the direction of the arrow in FIG. 1, each link member 1 tilts in opposite directions about the central shaft 2. Along with this, the upper and lower ends rotate relative to each other at the connecting cap 3, and at the same time, the link material cap 7 of the caster device 4 also rotates around both shafts 14 protruding from both sides of the base 5 as the inclination of the link material 1 changes. The pedestal 5 is simultaneously moved in the direction of the arrow while rotating. At this time, each link material 1, 1 rotates independently with respect to the pedestal 5, so the pedestal 5 remains horizontal regardless of the change in inclination such that the inclination angle of the lower end of each link material 1, 1 becomes narrower. As a result, the wheels 17 of the caster 6 continue to be in contact with the ground. Therefore, the load of the telescoping gate A is evenly distributed to both casters 6, and the pedestal 5 does not fall due to unbalanced load, allowing smooth movement of the telescoping gate A. Also, since the arms 10, 10 of the pedestal 5 extend away from each other in the direction of expansion and contraction, even if an unexpected force is applied in the direction of movement of the telescopic gate A, one arm 10 extending in the same direction will not fall over. Because it has a preventive effect, the pedestal 5
maintains a horizontal state without rotating in the same direction,
Enables smooth movement of telescopic gates. When the telescopic gate A is opened to a predetermined position, if the drop bar 8 is lowered, the drop bar 8 is always fitted vertically into the pedestal 5, so it fits into the desired fitting hole drilled in the road surface. Since it can be fitted and fixed securely, the telescopic gate A can be kept open without moving unexpectedly even if external force is applied.

Further, when closing the telescopic gate A, the drop bar 8 is pulled up and the ball 28 is fitted into the locking groove 27 formed in the drop bar 8, so that the drop bar 8 is held in the pulled up state. Thereafter, by pulling out the telescopic gate A in the opposite manner to the above, the inclination angle of the lower end of each link member 1, 1 changes to widen, but the pedestal 5 remains horizontal and the wheels of the caster 6 17 can run on the road surface while remaining in contact with the ground, and can close the telescopic gate A.

(Effects of the invention) As described above in detail with respect to the embodiment, in this invention, each link member is attached to both sides of the pedestal so as to rotate independently, so that the inclination of each link member changes. Regardless of the situation, the pedestal is always held horizontally, and as a result, the caster wheels do not lift up and remain firmly on the ground, so the load of the telescoping gate is evenly distributed to both casters, and the connection part due to load imbalance In addition to preventing wear and deformation of the pedestal, the pedestal can be moved smoothly without falling over. In addition, the casters of the pedestal are installed at positions that are separated from each other in the direction of expansion and contraction.
Even if an unexpected force is applied in the direction of expansion/contraction, one caster installed on the extension line in the same direction prevents it from falling, and the pedestal remains horizontal without rotating in the same direction and moves smoothly. As a result, the telescopic gate can be opened and closed in an extremely stable state without rattling, in a straight line without meandering, and in a light manner. Moreover, the drop rod inserted into the center of the pedestal is always held in a vertical position by the horizontal pedestal, and as the telescopic gate opens and closes in a straight line, it fits into the desired fitting hole drilled in the road surface. Because it can be inserted easily and securely,
It has the excellent effect of being able to provide a robust and durable caster device at a low cost, such as being able to maintain a fixed state without causing the telescoping gate to move unexpectedly even when subjected to external force. .

[Brief explanation of the drawing]

Fig. 1 is a front view of the telescopic gate of this invention, Fig. 2 is a partially cutaway plan view of the caster device, and Fig. 3 is a partially cutaway side view of the caster device.
FIG. 4 also shows an exploded perspective view. 1... link material, 4... caster device, 5...
... Pedestal, 6 ... Caster, 7 ... Link material cap, 8 ... Drop rod, 9 ... Base, 10 ... Shaft, 16 ... Screw rod, 17 ... Wheel, 19 ... Bearing hole, A ... Telescoping gate.

Claims (1)

[Scope of utility model registration request] Link members arranged front and back with inclinations in opposite directions are intersected and connected in a flexible manner,
In a telescopic gate in which a caster is attached to the lower part of a predetermined link material via a pedestal, the pedestal is formed with an upwardly projecting protrusion for pivoting the link material, and the lower ends of the link materials facing each other in the front and back are attached to the above-mentioned pedestal. The casters are rotatably attached to both sides of the protrusion, are spaced apart from each other in the direction of expansion and contraction of the telescopic gate across the pivot axis on the lower side of the pedestal, and are located at different positions in the depth direction of the telescopic gate. A caster device characterized in that a drop rod is fitted into the pedestal and can be moved up and down.