JPH074164A - Flap-up gate - Google Patents

Abstract

PURPOSE:To enable a single energizing means for upward turn to be used in common and improve appearance, even for different types of flap-up gates (gates with oscillation arms subjected to different moment far downward turn). CONSTITUTION:Regarding a flap-up gate having the base end of an oscillation arm 2 fixed to a support 1 at the prescribed height and a telescopic energizing means 3 to energize the oscillation arm 2 for upward turn, the means 3 is laid within the arm 2 for maintaining good appearance viewed from the outside. Furthermore, the support 1 is fitted with a bracket 5, and this bracket 5 and the base end 3a of the means 3 are jointed to each other with a link 4. Also, the fixing position of the bracket 5 or the forward end 3b of the means 3 is adjusted with positional adjustment means 6 and 8. The energizing force of the means 3 is thereby adjusted in such a way as corresponding to the downward turning moment of the arm 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flip-up type gate such as a gate or a breaker that is pivotally opened and closed vertically.

[0002]

2. Description of the Related Art A flip-up type gate of this type has a base end of a swing arm pivotally attached to a predetermined height position of a column by a shaft and further urges the swing arm to an upward movement open side. There is a means of action. By the way, as a flip-up type gate of this type, one conventionally disclosed in, for example, Japanese Utility Model Laid-Open No. 62-193100,
Alternatively, those disclosed in Japanese Utility Model Publication No. 162597/1991 are known.

In the flip-up type gate disclosed in Japanese Utility Model Laid-Open No. Sho 62-193100, as a biasing means for biasing the swinging arm upward, a relatively long length is pulled between the swinging arm and the column. I am using a coil spring for. This coil spring urges a rearward projecting portion that projects further rearward from the base end side pivotal support portion of the swing arm downward, and the biasing force downwardly rotates the swing arm (including the door body) by its own weight. I have to compete with. Also, in this known flip-up gate,
The coil spring is exposed to the outside.

In the flip-up type gate disclosed in Japanese Utility Model Laid-Open No. 1-162597, a gas-filled spring is interposed between the swing arm and the column as a biasing means for biasing the swing arm upward. I have set up. The gas charging spring has a biasing force that substantially opposes the downward turning force due to the own weight of the swing arm (including the door body). Also in this known example, the gas charging spring is exposed to the outside.

By the way, in the flip-up type gate of this type, the swinging arm should be rotated downward depending on the length of the swinging arm, the type of the door surface body attached to the tip of the swinging arm (weight change), and the like. And the moment will change. As described above, in the flip-up type gate, the moment that tries to rotate the swing arm downward varies depending on the model, but in the past, a biasing means having an elastic force adapted to the downward rotation moment was used. Each of them is adopted to compete with the downward dynamism.

[0006]

However, in the conventional flip-up type gate, as described above, the biasing means having different biasing forces are used each time the downward pivoting moment of the swing arm is different. However, it is necessary for the manufacturer to prepare a plurality of types of biasing means having different biasing forces, which increases the number of types of parts used and increases inventory costs.

In each of the flip-up gates disclosed in Japanese Utility Model Laid-Open No. Sho 62-193100 and Japanese Utility Model Laid-Open No. 162597, the biasing means (coil spring or gas charging spring) of the swing arm is used. Since it is installed in a state of being exposed to the outside, the urging means makes the appearance unfavorable. Further, in particular, in the case where the coil spring is used as the urging means, there is a problem that a finger, clothes or the like may be caught in the coil spring when the coil spring is contracted from its extended state.

It is an object of the present invention to make it possible to commonly use a component which serves as a biasing means in a flip-up type gate and to improve the appearance.

[0009]

The invention according to claim 1 of the present application is as follows.
A base end portion of a swing arm having a predetermined length is pivotally attached at a predetermined height position of a column by a shaft to allow the swing arm to swing up and down,
Moreover, in the flip-up type gate provided with the retractable biasing means for biasing the swing arm upward, the biasing means expands and contracts in the length direction of the swing arm within the swing arm. It is installed in a posture to obtain and the tip end of the biasing means is fixed to the swing arm, a bracket is provided on the support, and the bracket and the base end of the biasing means are connected by a link, and the bracket is attached. It is characterized in that it is provided with a bracket position adjusting means that is movable in the front-rear direction with respect to the support column and that can fix the bracket to the support column at a predetermined position in the front-rear direction.

According to the second aspect of the present invention, the base end portion of the swing arm having a predetermined length is pivotally attached by a shaft at a predetermined height position of the support column so that the swing arm can swing up and down. In a flip-up type gate having a retractable biasing means for biasing the swing arm upward, the biasing means can extend and contract in the swing arm lengthwise direction. The urging means is installed in a posture and with the tip end portion of the urging means fixed to the swing arm, and a bracket is provided on the column to connect the bracket and the base end portion of the urging means with a link, and the urging means. Of the urging means is fixed to the oscillating arm at a predetermined position in the oscillating arm length direction while the distal end of the urging means is movable in the longitudinal direction of the oscillating arm. It is characterized in that it is provided with a biasing means tip end position adjusting means adapted to be obtained.

[0011]

In each of the flip-up type gates according to claims 1 and 2, the moment of attempting to rotate the swing arm downward due to the weight of the vertically movable portion acts on the swing-up gate. Since the urging means for urging the moving arm to the upper rotation side is provided, the downward rotation moment due to the weight and the urging force to the upper rotation side by the urging means are substantially antagonized. The vertical movement of the swing arm can be performed easily. Further, in the flip-up type gates according to claims 1 and 2, the biasing means expands and contracts in the swing arm, and the biasing means cannot be seen from the outside.

By the way, in the flip-up type gate of this kind, when the length of the swing arm or the weight of the movable portion is changed, the moment for turning the swing arm downward is changed. In the flip-up type gate, the urging force of the urging means can be adjusted by the position adjusting means according to the change of the moment.

In the flip-up type gate according to claim 1 of the present application, the position of the bracket provided on the column is adjusted back and forth by the bracket position adjusting means to expand and contract the urging means through the link to exert its urging force ( The resilience) can be adjusted. That is, when the position of the bracket is adjusted back and forth, the urging means can be expanded or contracted by the amount of the displacement, whereby the urging force can be changed even with the same urging means. Therefore, even in a flip-up gate in which the downward pivoting moment of the swinging arm is different due to the difference in the model, by adjusting the position of the bracket back and forth, a single biasing means can be used to rotate the swinging arm downward. It is possible to apply upward turning force that opposes the dynamic moment.

Further, in the flip-up type gate according to claim 2 of the present application, the fixed position of the tip end portion of the biasing means can be adjusted in the swing arm length direction by the biasing means tip end position adjusting means. The urging force of the urging means can be adjusted by adjusting the fixed position of the tip of the urging means (adjusting the expansion and contraction amount of the urging means). Also in this case, a single urging means can deal with flip-up type gates having different downward pivoting moments of the swing arm.

When the urging means having an urging force on the extension side is used, the pivot end that pivotally attaches the base end of the link and the strut side to the swing arm base end and the strut. When the one that has an urging force on the contraction side is used as the urging means, the pivoting part that pivotally connects the base end part of the link and the column side, Position it at the rear side from the pivotal connection between the base end of the swing arm and the column.

[0016]

In the flip-up type gate according to the first aspect of the present invention, the bracket position adjusting means adjusts the position of the bracket to which the base end portions of the links are connected in the front-rear direction to urge the bracket. The biasing force of the biasing means can be adjusted. Further, in the flip-up type gate of the invention of claim 2, the tip end portion of the biasing means adjusts the tip end portion of the biasing means by the swing arm length. By adjusting the position in the vertical direction,
The urging force of the urging means can be adjusted. Therefore, in the flip-up gate according to each claim of the present application, even if the downward turning moment of the swing arm is changed due to a change in the model or the like, it is only necessary to adjust the biasing force of the biasing means by each position adjusting means. There is an effect that it is possible to cope with the situation, and the urging means can be shared (the type of the urging means can be reduced and the storage cost of parts can be reduced).

Further, in the flip-up type gate according to the claims of the present application, since the biasing means is adapted to expand and contract within the swing arm, the fingers and clothes are pinched by the expansion and contraction of the biasing means when the gate is opened and closed. This trouble can be solved in advance, and the urging means cannot be seen from the outside, so that the appearance can be improved.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Some embodiments of the present invention will be described with reference to FIGS. 1 to 11. FIGS. 1 to 9 show a first embodiment of the present invention, and FIG. 10 shows a second embodiment of the present invention. For example, FIG. 11 shows a flip-up gate according to the third embodiment of the present invention. still,
In the first embodiment (FIGS. 1 to 9) and the third embodiment (FIG. 11), flip-up doors are adopted as flip-up gates, respectively, and in the second embodiment (FIG. 10), flip-up doors are used. A flip-up circuit breaker is used as the lift-up gate.

The flip-up type gate according to the first embodiment shown in FIGS. 1 to 9 is used, for example, at an entrance / exit of a parking lot or the like, and is a pair of left and right columns vertically erected at a predetermined interval. The base ends 2a and 2a of the swing arms 2 and 2 are pivotally mounted on the shafts 10 and 10 at a predetermined height of 1, 1 (for example, about 75 cm), and further, between the tip ends of the swing arms 2 and 2. On the other hand, the door face member 7 is provided between the two swing arms 2, 2 so that the swing arms 2, 2 can swing up and down only within the range between the horizontal closed position and the vertical open position.

In the first embodiment, since the flip-up type door is adopted as the flip-up type gate, the pair of right and left swing arms 2 and 2 serve as support arms for supporting the door face member 7. The door face body 7 serves as a shielding member. The door body 7 is formed in a horizontally long rectangle having a relatively short vertical width. Therefore, the door face body 7 is separated from the ground surface considerably above even in the closed state.

Each swing arm 2, 2 is a hollow rod-shaped mold material having a length of about 125 cm and a hollow portion 20 inside. The swing arms 2 and 2 are capable of swinging up and down within a range of an angle of 90 ° between the closed position, which is the horizontal posture, and the open position, which is the vertical posture.
That is, at the position where the swing arm 2 moves downward to the horizontal posture,
As shown in FIG. 4, the lower surface of the swing arm 2 near the base end is the support column 1.
Is placed on the upper surface of the swing arm 2 to restrict the swing arm 2 from further moving downward, and at the position where the swing arm 2 is moved up to the vertical posture, as shown in FIG. The abutment piece 21 provided on the base end portion 2a of the abutment abuts the abutment projection 11 on the upper surface of the column 1,
The swing arm 2 is regulated so as not to fall further backward. When the swing arms 2 and 2 are stood upright as shown by the chain line 2'in FIG. 1, the height of the door face body 7 becomes slightly higher than the height of the person's back (about 2000 from the ground).
mm height).

The swing arms 2 and 2 are biased upward by the biasing means 3 and 3 provided inside the swing arm 2. In the first embodiment, as the biasing means 3, a coil spring 31 having a biasing force on the extension side is adopted. The biasing means 3 inserts / fixes a rod 33 into the holding case 32 having an appropriate length (for example, about 285 mm) in the length direction of the swing arm 2 in the swing arm length direction. The two spring receivers 34, 35 are guided by the coil springs, and a coil spring (compression coil spring) 31 is interposed between the spring receivers 34, 35. The biasing means 3 is installed in the swing arm 2 by fixing the holding case 32 with screws 81 from the front and rear two positions on the left and right outer side surfaces of the swing arm 2, respectively. . The holding case 32 can be adjusted in position in the lengthwise direction of the swing arm 2 by the biasing means tip end position adjusting means 8. The biasing means tip end position adjusting means 8 will be described below. It will be described later.

On the other hand, a bracket 5 is provided on the upper portion of the column 1. In the first embodiment, the bracket 5
Is positioned on the front side by an appropriate distance (for example, 55 to 70 mm) from the pivotal portion (shaft 10) between the swing arm base end portion 2a and the column 1. The bracket 5 can also be adjusted in the front-rear direction by the bracket position adjusting means 6. The bracket position adjusting means 6 will be described later.

The bracket 5 and the base end portion 3a of the urging means 3 are connected by a link 4. That is, the bracket 5 and one end portion (base end portion) 4a of the link 4 are rotatably pivoted by the shaft 41, and the other end portion (tip portion) 4b of the link 4 and the base side spring receiver 34 (claim Biasing means base end portion 3a in the range
And) are rotatably pivoted about a shaft 42. At this time, the coil spring 31 is maintained in an appropriately compressed state by the link 4 interposed between the bracket 5 and the base side spring receiver 34 being stretched.
In this state, the front side spring receiver 35 (which is the tip end portion 3b of the urging means in the claims) is prohibited from moving to the front side by the nut 36, so that the extension side of the coil spring 31 is attached. Due to the urging force, the pivotally connecting portion (the shaft 42) between the base-side spring receiver 34 and the link tip portion 4b is urged toward the oscillating arm base end side.

The pivotally connecting portion (shaft 41) between the bracket 5 and the link base end portion 4a is a swing arm base end portion 2a in the first embodiment.
Is positioned at the same height as the pivotally connected portion (shaft 10) of the column 1. Then, the link 4 takes a parallel posture with the swing arm 2 when the swing arm 2 is in the horizontal posture position as shown in FIG. 4, while the swing arm 2 is in the vertical posture position as shown in FIG. In a certain state, the swing arm 2 has a predetermined angle (for example, 20 to 3).
The tilted posture has an angle of about 0 °. A notch 22 is formed on the lower surface of the swing arm 2 on the base end side to allow the link 4 to project in and out of the hollow portion 20.

Further, while the swing arm 2 is arc-rotated from the horizontal posture position to the vertical posture position, the pivotal joint portion (shaft 42) between the link tip portion 4b and the base side spring receiver 34 is formed as shown in FIGS. At a circular arc locus (an arc locus having a radius of the length of the link 4) R, at this time, the initial length between the rotation center (shaft 10) of the swing arm 2 and the shaft 42 ( (Indicated by a virtual arc locus S in FIG. 4) is gradually shortened. Then, when the swing arm 2 is rotated upward to the vertical posture position, the coil spring 31 becomes longer than the initial length by the length indicated by the symbol T (FIG. 4).

By the way, the downward rotation moment applied to the swing arm 2 is the largest when the swing arm 2 is in the horizontal posture position, and becomes gradually smaller as the swing arm 2 rotates upward. , And has a characteristic of becoming minimum (0) when reaching the vertical posture position. Further, the downward turning moment applied to the swing arm 2 also changes depending on the total weight of the swing arm 2, the door surface member 7, and other movable parts. On the other hand, in the first embodiment,
The urging force of the coil spring 31 is proportional to the reduction amount of the coil spring 31, and the urging force increases as the reduction amount increases. Therefore, in the first embodiment, the urging force of the coil spring 31 is the largest in the swing arm horizontal posture state shown in FIG. 4, and the smallest in the swing arm vertical posture state shown in FIG. .

In the flip-up type gate of the first embodiment,
The adjusting means is provided so that the biasing force of the coil spring 31 can be adjusted according to the downward turning moment of the swing arm 2. That is, in the first embodiment, the bracket position adjusting means 6 is adapted to adjust the compression amount of the coil spring 31 by adjusting the position of the bracket 5 in the front-back direction with respect to the support column 1 (corresponding to claim 1). ) And the position adjustment of the front side spring receiver 35 in the length direction of the swing arm 2 so that the compression amount of the coil spring 31 can be adjusted. (Corresponding) and. The flip-up gate of this embodiment includes the two position adjusting means 6 and 8 described above, but in other embodiments, only one of the two position adjusting means may be used. .

The bracket position adjusting means 6 for adjusting the position of the bracket 5 includes a guide part 61 for guiding the bracket 5 in the front-rear direction on the upper part of the support column 1, and a predetermined part for moving the bracket 5 along the guide part 61. Adjustment bolt 62 for fixing in position.
As shown in FIG. 5, the guide portion 61 allows the bracket 5 to be moved only in the horizontal front-rear direction with respect to the support column 1 by fitting the lower part of the bracket 5 to the upper part of the support column by fitting the concave-convex fitting groove. . The adjustment bolt 62 is screwed into a female screw 63 provided on the upper portion of the column 1, and the bracket 5 can be positioned at a predetermined position in the front-rear direction depending on the amount of the adjustment bolt 62 entering the female screw 63. There is. That is, as shown in FIG. 4, when the amount of the adjusting bolt 62 entering the female screw 63 is increased, the bracket 5 moves rearward (on the side of the shaft 10) and, conversely, as shown in FIG. If the amount of penetration is reduced, the bracket 5 will move forward (on the side opposite to the shaft 10).
In the flip-up type gate according to the first embodiment, the bracket 5 can be moved back and forth within the range from the rear position shown in FIG. 4 to the front position shown in FIG. 7 (length range of about 15 mm). There is.

In FIG. 8, the swing arm 2 is pivoted up and down with the bracket 5 in the rear position (white circle position), and the bracket 5 is in the front position (black circle position). It shows how the expansion and contraction amount of the coil spring 31 changes when the swing arm 2 is pivoted up and down in the state in which the bracket 5 is placed on the front side (from the white circle side to the black circle side). It can be seen that the amount of compression of the coil spring 31 increases (that is, the biasing force of the coil spring 31 increases) at a lower angle position of the swing arm 2 (a position where the downward pivoting moment is large) as it is moved to (). That is, when the swing arm 2 is rotated up and down while the bracket 5 is located at the rear position (white circle position), the distal end pivot portion (the shaft 42) of the link 4 has an arc locus indicated by reference symbol R. The length of the coil spring 31 at this time (reference numeral 42
And the length between 41) changes at each angle as shown by the dotted line. On the other hand, when the swing arm 2 is pivoted up and down while the bracket 5 is in the front position (black circle position), the tip pivot portion (shaft 42 ') of the link 4 is indicated by the reference symbol R'. An arc locus is drawn, and the length of the coil spring 31 at this time is between the reference numerals 42 'and 41 at each angle. In FIG. 8, the shorter the coil spring 31 is, the larger the biasing force thereof becomes.

On the other hand, the biasing means tip position adjusting means 8 for adjusting the position of the front spring receiver 35 is provided with holding cases 32 on the left and right side surfaces of the swing arm 2 as shown in FIGS. As a hole for inserting the screw 81 for fixing the screw, a long hole 82 (front and rear, which has an appropriate length in the swing arm length direction,
There are a total of 4 locations with 2 locations on each side. In the illustrated example, two screws 81, 81 are inserted through each of the elongated holes 82, 82. Then, the urging means tip end position adjusting means 8 adjusts the positions of the screws 81, 81 screwed to the holding case 32 side in the swing arm length direction within the range of the elongated hole 82, and holds the holding case. The fixing position of 32 (where the front side spring receiver 35 is positioned) can be adjusted. In the illustrated example, the adjustment range L (FIG. 9) of the front spring receiver 35 is about 7 mm.

In the flip-up type gate according to the first embodiment,
Each of the above position adjusting means 6, 8 (either one or both)
By adjusting, the urging force of the coil spring 31 can be adjusted so as to correspond to the downward rotation moment applied to the swing arm 2. That is, when the downward pivoting moment of the swing arm 2 is small (for example, when the weight of the movable part is relatively small), the coil spring 31 is used in a slightly compressed state by each position adjusting means 6 and 8 so as to match it. Then
On the contrary, when the downward rotation moment is large, the coil spring 31 is used in a large compression state by the position adjusting means 6 and 8 so as to be commensurate with it. In this way, the biasing means 3
With a single urging means 3, a single urging means 3 can adjust the appropriate upward force for flip-up gates of different models (different downward pivoting moments of the swing arm 2). It can be adjusted to the rotational biasing force.

Further, in the flip-up type gate of this embodiment,
When the swing arm 2 is in the horizontal posture, the pivot arm (shaft 10) of the swing arm base end 2a, the pivot arm (shaft 41) of the link base end 4a, and the link tip 4b are pivoted. Since the attachment part (the shaft 42) is aligned on a straight line, the upward movement of the swinging arm by the biasing means 3 does not work, but when the swinging arm 2 is lifted up a little, it is linked to the swinging arm 2. 4 becomes an angle with
After that, the oscillating arm upward pivoting action is generated by the urging force of the urging means 3, so that the oscillating arm 2 can be pivoted upward with a comparatively light force. Further, as shown in FIG. 6, when the swing arm 2 is rotated upward to the vertical posture position, the link 4 supports the swing arm 2 from an oblique direction, so that the swing arm 2 is not supported. It doesn't fall forward easily. It should be noted that when the swing arm 2 in the vertical posture position is slightly strongly pushed forward, the coil spring 31 is contracted and the swing arm 2 can be arc-rotated to the downward closing side.

Further, in the flip-up type gate of this embodiment,
Since the biasing means 3 is installed inside the swing arm 2, the biasing means 3 becomes invisible from the outside to improve the overall appearance, and the coil spring is used when the swing arm 2 is vertically moved. The trouble of pinching your fingers or clothes with 31 is gone.

In the second embodiment shown in FIG. 10, a flip-up type breaker is adopted as the flip-up type gate, but in this flip-up type breaker, the swing arm 2 itself constitutes a blocking member. ing. The biasing means used in this second embodiment basically has the same structure as that of the first embodiment. In the second embodiment, the number of the columns 1, the swinging arms 2, and the biasing means may be one each.

In the flip-up type gate of the third embodiment shown in FIG. 11, as the biasing means 3, a pulling coil spring that exerts a biasing force on the contracting side is adopted. Also, this figure 1
In the first example, the base end portion 4a of the link 4 has the bracket 5 at the rear side of the pivotal attachment portion (shaft 10) of the swing arm base end portion 2a.
It is pivotally attached (axis 41) to. Further, the bracket 5 can be adjusted forward and backward by the bracket position adjusting means 6 on the rear side of the pivotal portion (shaft 10) of the swing arm base end 2a. The tip portion 3b of the biasing means 3 is
The position can be adjusted by the biasing means tip end position adjusting means 8 of the first embodiment. In the flip-up type gate of the third embodiment shown in FIG. 11, the biasing means 3 has the same function as that of the first embodiment, although the biasing force acts on the contracting side.

Further, in another embodiment, the flip-up type gate of the present invention can be used for opening / closing the entrance / exit of the carport. In that case, each pillar of the entrance / exit of the carport can be used as the pillars 1 and 1. Good.

Further, in the flip-up type gates of the above-mentioned first to third embodiments, coil springs for expansion or contraction are used as the biasing means 3, but in other embodiments gas charging springs are used. May be used.

[Brief description of drawings]

FIG. 1 is a perspective view of a flip-up type gate according to a first embodiment of the present invention.

FIG. 2 is a partial side view of FIG.

3 is a sectional view taken along line III-III in FIG.

4 is a sectional view taken along line IV-IV in FIG.

5 is an enlarged sectional view taken along line VV of FIG.

FIG. 6 is a state change diagram of FIG. 4.

FIG. 7 is a state change diagram of FIG.

FIG. 8 is an explanatory view of the operation of the flip-up type gate according to the first embodiment of the present invention.

9 is a partially enlarged view of FIG.

FIG. 10 is a perspective view of a flip-up type gate according to a second embodiment of the present invention.

FIG. 11 is a side view of a flip-up type gate according to a third embodiment of the present invention.

[Explanation of symbols]

1 is a column, 2 is a swing arm, 2a is a swing arm base end, 3 is a biasing means, 3a is a base end of the biasing means, 3b is a tip end of the biasing means, 4 is a link, 5 is A bracket, 6 is a bracket position adjusting means, 8 is a biasing means tip end position adjusting means, and 10 is a shaft.

Claims (2)

[Claims] 1. A base end portion (2a) of a swing arm (2) having a predetermined length is provided with a shaft (1) at a predetermined height position of a column (1).
0) so that the swing arm (2) can swing up and down,
Moreover, the flip-up type gate is provided with a retractable urging means (3) for urging the swing arm (2) upwardly, and the bias means (3) is the swing arm. It is installed in (2) in such a position that it can expand and contract in the lengthwise direction of the swing arm (2) and with the tip end portion (3b) of the biasing means (3) fixed to the swing arm (2). A bracket (5) is provided on the column (1) to connect the bracket (5) and the base end portion (3a) of the biasing means (3) with a link (4), and the bracket (5). ) Is movable in the front-rear direction with respect to the support column (1), while the bracket (5) is fixed to the support column (1) at a predetermined position in the front-rear direction. The flip-up gate is characterized by: 2. A base end portion (2a) of a swing arm (2) having a predetermined length is attached to a shaft (1) at a predetermined height position of a column (1).
0) so that the swing arm (2) can swing up and down,
Moreover, the flip-up type gate is provided with a retractable urging means (3) for urging the swing arm (2) upwardly, and the bias means (3) is the swing arm. It is installed in (2) in such a position that it can expand and contract in the lengthwise direction of the swing arm (2) and with the tip end portion (3b) of the biasing means (3) fixed to the swing arm (2). A bracket (5) is provided on the column (1) to connect the bracket (5) and the base end portion (3a) of the urging means (3) with a link (4), and the urging means. The tip portion (3b) of (3) is made movable in the length direction of the swing arm with respect to the swing arm (2), while the tip portion (3b) of the biasing means is moved to the swing arm length. A flip-up gate characterized by comprising a biasing means tip position adjusting means (8) adapted to be fixed to the swing arm (2) at a predetermined position in the vertical direction. .