JPH10195850A - Bearing beam for preventing movable rack from buckling rod - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a rack from bucking by a bearing beam and to keep the bearing beam from obstructing the raising of a door to the full. SOLUTION: Guide rods 7 are arranged parallel to a rack rod 5 on both side building frames 4 sandwiching the rack rod 5 for opening and closing a door 1. Sliding holes for inserting the rack rod 5 and both side guide rods 7 are formed in a bearing beam 9, the rack rod 5 and the guide rods 7 are slidably inserted in the respective sliding holes of the bearing beam 9, and the rack rod 5 is stopped at the buckling position by the bearing beam 9 not to descend lower than that.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called steadying mechanism for preventing a buckling of a rack bar (or a spindle bar) for moving a gate door up and down.

[0002]

2. Description of the Related Art When closing a gate by lowering a door body, if the rotation of the motor is stopped at the same time when the door body reaches the lowermost part of the gate, no extra load acts on the rack bar. However, if the motor does not stop even if the door reaches the bottom of the gate for some reason, the rack rod is not lowered, but a force acts on the rack rod to move it downward by the rotation of the motor. I do.

[0003] Since the rack bar is elongated, if this state is continued as it is, the rack bar may be bent in a U shape and buckle. Therefore, in order to prevent the buckling of the rack bar, a so-called anti-vibration girder is fixed to the left and right sides of the frame so that the rack bar is shorter than the buckling length, and the rack girder is fixed by the girder. To prevent buckling.

[0004]

However, since such a conventional girder is fixed to the frame by bolts or the like,
When trying to raise the door fully, it is necessary to remove the fixed girder from the frame one by one in order for the door to be obstructed by this girder and raise it to the highest position. Was troublesome.

The buckling length of the rack bar is determined by the height of the gate post and the strength of the rack bar, and the effect cannot be exerted unless the receiving girder is set at a predetermined position. It is essential to set the digit at the position. On the other hand, in order to be able to easily raise the door body to the highest position, it is necessary that the receiving girder be located above the highest position of the door body.

[0006]

In order to solve the above problem, a movable rack bar buckling prevention girder according to the present invention has a rack bar on both sides of a rack bar for opening and closing a door. Guide rods are arranged in parallel with each other, slide holes are formed in the receiving girder for inserting the rack rods and guide rods on both sides of the rack rods, and the rack rods and guide rods slide in the respective sliding holes of the girder. In addition to inserting the rack as much as possible, the receiving girder is stopped at a position where the rack bar buckles and does not descend below it.

Further, the guide rod is erected on an arbitrary upper end surface of the frame, and the receiving girder is stopped by contacting the upper end surface of the frame so as not to descend below it (claim 2). A support fitting which can be in contact with the lower surface of the receiving girder is attached to an arbitrary position of the bar, and the supporting fitting abuts on the position of the center of gravity of the receiving girder to support the receiving girder horizontally (claim 3).

[0008]

When the door located at the highest position is lowered, the supporting bracket of the girder is lowered at the same time, so that the girder is lowered as the door is lowered. Then, when the girder lowers to a position where it comes into contact with the upper end surface of the frame, the girder is supported by the upper end surface and remains at that position even if the door body is lowered and the girder support bracket is lowered. The position where this girder stays is set to match the buckling length of the rack bar. Therefore, even if an excessive force is applied to the rack bar, the rack girder can move in the left-right direction by the girder. By being regulated, run-out is prevented.

On the other hand, when the door is raised, the girder support bracket is also raised as the door is raised. After the upper surface of the girder support bracket comes into contact with the lower surface of the girder, the girder rises together with the support bracket while sliding on the guide rod. When the receiving girder is lowered to a predetermined position, it functions as a steady rest, and when the door body rises, it rises together with the rise.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a movable rack bar buckling prevention receiving girder according to the present invention will now be described with reference to the drawings. 2 is attached, and moves up and down in a roller guide groove 4 provided in the gate body 3. Two rack bars 5 are connected to the upper end of the door body 1. The rack bar 2 is moved up and down by a motor 6 with the door 1 suspended. In the following description, a case using a rack bar having an H-shaped cross section will be described.
The same applies when a spindle rod having a round cross section is used.

Reference numeral 7 denotes a guide rod which stands on the upper end face 8 of the roller guide 4 provided on the frame 3. The rack rod 5 is provided on the upper end face 8 of the roller guide groove 4 on both sides of the rack rod 5.
It is provided so that it may become parallel. For example, a cylindrical pipe or the like is used as the guide rod 7, but in some cases, the guide rod 7 may have a square cross section or another shape. The guide bar 7 can be provided at any other location, but in any case, it is sufficient that the guide bar 9 described below does not fall below a predetermined position.

The receiving girder 9 is constructed by assembling a steel material or the like having a sufficient strength, and has circular sliding holes 10 for sliding the guide rods 7 at both ends. In the middle part, two rectangular sliding holes 11 for sliding the rack bar 5 are provided. In the illustrated example, the door 1 is connected to two rack bars 5.
However, when the door body 1 is hung by one rack bar 5, the number of the rectangular sliding holes 11 may be one.
The circular sliding hole 10 is slidable with the guide bar 7 and also slidable with the two rack bars 5 at the same time.

Incidentally, an appropriate bushing material may be provided in the sliding hole in order to ensure a smooth movement. The receiving girder 9 can be formed in an appropriate shape by the arrangement of the rack bar 5 and the guide bar 7. In any case, the position of the receiving girder 9 in the left-right direction is regulated by the guide bar 8. It is sufficient that the receiving beam 9 prevents movement in the left-right direction.

Reference numeral 12 denotes a support for the girder 9 attached to the lower end of the rack bar 7 immediately above the door 1. A cushioning rubber 13 is provided on the upper surface of the support fitting 12, and the cushioning rubber 13 comes into contact with the center of gravity of the receiving girder 9, and the receiving girder 9 is kept horizontal by the support fitting 12. It moves up and down. In some cases, the support fitting 12 may not be located at the center of gravity of the receiving girder 9, or an optional portion of the door 1 may directly contact the receiving girder 9 without providing a special supporting fitting.

When the door 1 is lowered and the gate is closed by the door 1 as shown in FIG. 1, the receiving girder 9 is held at the lower end of the guide rod 7 and is shown in FIG. As shown in ()), the door 1 and the support fitting 12 are completely spaced apart. In this state, the receiving girder 9 is the rack bar 5
Will function as a steady rest.

Next, when the door body 1 is raised from this state, when the door body 11 is raised to the position shown in FIG. 5B, the cushion rubber 13 of the support fitting 12 comes into contact with the lower surface of the receiving girder 9. Thereafter, as the door 1 rises, the receiving girder 9 also rises while being balanced by the support fittings 12. And FIG.
(A). When the door 1 rises above a certain height, the girder 9 automatically rises at the same time, so that the door 1 is not limited to the girder 9.

When the door 1 is lowered from this state, the receiving girder 9 is also lowered at the same time when the door 1 is lowered. And
When the position shown in FIG. 5B is reached, only the door 1 descends without the receiving beam 9 descending thereafter. The receiving girder 9 regulates the horizontal movement (movement in the front, rear, left and right directions) of the rack bar 5 at the position of the buckling length of the rack bar 5, and functions as a steady rest of the rack bar 5.

[0018]

As described above, according to the movable rack bar buckling prevention girder according to the present invention, guides are provided on both sides of the rack bar for opening and closing the door in parallel with the rack bar. A rod is provided, and a sliding hole is formed in the receiving girder for inserting the rack rod and the guide rods on both sides thereof. The rack rod and the guide rod are slidably inserted into the respective sliding holes of the receiving girder. At the same time, since the receiving girder is stopped at the position where the rack bar buckles and does not descend downward, the horizontal position of the receiving girder is regulated by the guide bar, so that the position of the rack bar is also regulated. This prevents buckling of the rack bar, and the girder can move up and down without being fixed to the frame.
There is no hindrance when raising the door to the full.

Also, the guide rod is erected on an arbitrary upper end surface of the skeleton, and the receiving girder is stopped by contacting the upper end surface of the skeleton so as not to descend below it. Can be easily performed, and the support of the girder can be ensured.

On the other hand, a support fitting which can be brought into contact with the lower surface of the receiving girder is mounted at an arbitrary position on the rack bar, and the supporting fitting abuts on the center of gravity of the receiving girder to support the receiving girder horizontally. Can be raised and lowered while being supported in a horizontal state, and sliding of the receiving girder with the rack bar and the guide bar can be performed very smoothly.

[Brief description of the drawings]

FIG. 1 is a front partial sectional view of a gate provided with a movable rack bar buckling prevention receiving girder of the present invention.

FIG. 2 is a partial side sectional view of a gate provided with a movable rack bar buckling prevention receiving girder of the present invention.

FIG. 3 is a plan view of a movable girder bar buckling prevention girder of the present invention.

FIG. 4 is a front view of the movable rack bar buckling prevention receiving girder of the present invention.

FIG. 5 is a side view showing an operation state of the movable rack bar buckling prevention receiving girder of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Door body 2 Roller 3 Roller guide groove 4 Frame 5 Rack bar 6 Motor 7 Guide bar 8 Top surface 9 Receiving beam 10 Circular sliding hole 11 Square sliding hole 12 Support bracket 13 Buffer rubber

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Hiroshi Nakaigawa 1-9-1, Motoasakusa, Taito-ku, Tokyo Inside Japan Kiko Co., Ltd.

Claims (3)

[Claims] 1. A guide bar is provided on both sides of a rack bar for opening and closing a door, and a guide bar is disposed in parallel with the rack bar, and the rack bar and the guide bars on both sides are inserted into a receiving girder. A hole is formed, and a rack bar and a guide bar are slidably inserted into respective sliding holes of the receiving girder, and the receiving girder stops at a position where the rack bar buckles and does not descend below it. A movable girder bar buckling prevention girder. 2. The guide rod is erected on an arbitrary upper end surface of the skeleton,
2. The movable rack bar buckling prevention girder according to claim 1, wherein the girder stops by coming into contact with the upper end surface of the frame and does not descend below it. 3. The rack according to claim 1, wherein a support bracket is provided at an arbitrary position on the rack bar, the support bracket being capable of abutting on the lower surface of the girder, and the support bracket is in contact with the center of gravity of the girder to support the girder horizontally. Movable rack bar girder to prevent buckling.