JPH072716Y2 - Gas damper drive type lid opening / closing device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a gas damper drive type lid opening / closing device used for a grating lid or the like that closes openings such as snow melting grooves and common grooves installed on sidewalks. It is a thing.

[Prior Art] As disclosed in Japanese Utility Model Application Laid-Open No. 57-133660, it has been conventionally performed to reduce the labor load at the time of opening the lid by utilizing the gas pressure sealed in the cylinder of the gas damper. There is.

In the conventional device shown in FIG. 4, the base end of the lid 42 is pivotally attached to the fixed frame body 41 by the horizontal pivot 43, and the upper end of the fixing bracket 44 is fixed to the fixed frame 41 at a position below the horizontal pivot 43. Of the gas damper 46, the mounting end 48 of the cylinder 47 of the gas damper 46 is pivotally attached to the tip of the lid 42 by a horizontal pivot 49.
A mounting end portion 51 of a rod 50 of a gas damper 46 is pivotally attached to a lower end portion of a fixed bracket 44 by a horizontal pivot shaft 52 parallel to the horizontal pivot shaft 43 at a position below the base portion 45.

In this conventional device, the gas damper 46 rotates upward about the horizontal pivot 52 as shown by the chain line in FIG.
At the final stage of crossing the vertical plane standing on 52 toward the horizontal axis 43 side, the lid 42 makes 90 degrees with respect to the horizontal plane.

In this way, when the lid 42 is rotated open to the specified angle,
The piston fixed to the inner end of the rod 52 is in contact with the end block of the cylinder 47 through which the rod 52 penetrates, and the gas damper 46 is in a state of being extended to the maximum length.

However, due to the play space existing between the fixed frame body 41 and the lid 42, the lid 42 can be opened up to about 130 degrees, so that the lid 42 exceeds the specified angle due to excessive pulling operation by an operator or the like. When opened, the gas damper 46, which is in the maximum length stretched state, has pistons, end blocks,
Excessive force was applied to the connecting portion between the piston and the rod, and the gas damper 46 was damaged or destroyed.

[PROBLEMS TO BE SOLVED BY THE INVENTION] Therefore, an object of the present invention is to provide a gas damper drive type lid opening / closing device provided with double preventing means so as not to damage or destroy the gas damper due to excessive opening of the lid. Is to provide.

[Means for Solving the Problem] The following will describe with reference numerals in the accompanying drawings. In the gas damper driving type lid opening / closing device of the present invention, the base end portion of the lid 2 is fixed to the fixed frame body 1 by the horizontal pivot 3 Then, the base end portion of the swing bracket 13 is pivotally attached to the tip end side of the lid 2 by the horizontal pivot shaft 15.

The mounting end 8 of the cylinder 7 of the gas damper 6 is pivotally attached by means of a horizontal pivot 9 to the tip of a rocking bracket 13 on the opposite side of the horizontal pivot 3 with respect to the horizontal pivot 15.

At a position below the horizontal pivot 3, the mounting end 11 of the rod 10 of the gas damper 6 is fixed by the horizontal pivot 12 to the bearing plate 5.
The lid 2 is rotatably biased in the opening direction by the pressure of the gas sealed in the cylinder 7.

When the attachment portion 20 of the tension member 21 is provided at the tip of the lid 2 and the attachment portion 24 of the tension member 21 is provided on the fixed wall surface 27 located on the tip end side of the lid 2, when the lid 2 rotates beyond the specified angle. A tension member (21), which is tensioned by, is installed between the mounting portion (20) and the mounting portion (24).

[Operation] The lid 2 is constantly urged to rotate in the opening direction by the gas damper 6, but the rotational force in the opening direction by the gas damper 6 is set to a certain extent smaller than the rotational force in the closing direction due to the gravity of the lid 2. Therefore, the lid 2 is stably held in the closed state.

The tip of the lid 2 is pulled up manually by a worker so as to cancel the difference between the rotational force in the closing direction and the rotational force in the opening direction.
When the start of open rotation is given to the rod, the rod of the gas damper 6
10 extends from the cylinder 7, and the lid 2 starts to rotate around the horizontal pivot 3 by the reaction force of the gas damper 6.

As the opening rotation of the lid 2 progresses, the gas damper 6 rotates upward about the horizontal pivot 12 as shown by the chain line in FIG.
At the final stage when the vertical plane set up on the horizontal pivot 12 is moved to the horizontal pivot 3 side by about 10 degrees, the lid 2 stands upright at 90 degrees with respect to the horizontal plane.

The lid 2 opened to the specified angle in this way is held in the opened position by the urging force of the gas damper 6 extended to the maximum length.

When the lid 2 is opened and rotated beyond the specified angle as shown in FIG. 3 by excessive pulling operation, the swing bracket 13 is rotated downward about the horizontal pivot 15 as shown in FIG. Along with this, the horizontal pivot 9, which pivotally mounts the mounting end 8 of the cylinder 7 of the gas damper 6, also moves downward.

Due to the escape rotation of the swing bracket 13 as described above, the gas damper 6 does not receive a force in the extension direction by keeping the extension state at the stage of the open rotation up to the predetermined angle. Further, the excessive rotation of the lid 2 that cannot be absorbed by the escape rotation of the swing bracket 13 is accurately prevented by the tension of the tension member 21 between the mounting portion 20 and the mounting portion 24.

After opening the lid 2, the worker opens the common groove from the sidewalk surface 35 to the opening 33 of the common groove.
Then, when the user pulls in the lower portion of the tension member 21 that has been stretched with some slack and pulls down the tension member 21 from the inside of the opening 33, the distance between the horizontal pivot 3 and the mounting portion 20 becomes the arm length of the rotational moment. Therefore, the lid 2 is closed and rotated with a relatively small force.

[Embodiment] In the illustrated embodiment, the receiving frame 34 is fixed to the upper edge of the opening / closing opening 33 of the common groove, and the lid 2 is closed when the lid 2 is closed.
Is fitted and placed on. The fixed frame body 1 to which the lid 2 is pivotally attached is composed of a fixed lid fixed to the receiving frame body 34. The horizontal pivot 3 is inserted into a bearing plate 2a protruding from the side surface of the lid 2 and a bearing plate 1a protruding from the side surface of the fixed lid.

The swing bracket 13 is manufactured by bending a metal plate so that the base end side is inclined obliquely downward with respect to the main portion 13a, and the horizontal pivot 15 is inserted into the base end of the swing bracket 13. The bearing sleeve 14 is welded. A horizontal pivot 15, which is parallel to the horizontal pivot 3, is attached to a bearing plate 18 having a U-shaped cross section, which is welded to the lower surface 17 of the lid 2.

A stopper 32 composed of a spring pin, a screw pin, or the like is inserted into a through hole at the tip of the horizontal pivot shaft 15.
By removing 32, the horizontal pivot 15 can be pulled out from the bearing hole in the bearing plate 18.

A pair of bearing plates 16 through which the horizontal pivot 9 is inserted are welded to the lower surface of the tip of the swing bracket 13. Horizontal axis 9
A stopper 30 made of a spring pin or the like is inserted into the through hole at the tip of the horizontal pivot 9, and the horizontal pivot 9 can be pulled out from the bearing hole of the bearing plate 16 by removing the stopper 30.

The mounting substrate 4 is fixed by bolts 22 to the fixed wall surfaces 28 and 29 of the opening 33 of the common groove that face each other. A fixed bearing plate 5 is welded to a base plate 19 having a U-shaped cross section fixed to the mounting substrate 4, and a horizontal pivot 12 parallel to the horizontal pivot 3 is inserted into the fixed bearing plate 5. Horizontal axis 12 is horizontal axis 3
And at a position diagonally below the horizontal pivot 9. The through hole at the tip of the horizontal pivot 12 has a stopper made of a spring pin, etc.
31 is inserted, and by removing the stopper 31,
The horizontal pivot 12 can be pulled out from the bearing hole in the bearing plate 15.

As shown in FIG. 1, the main portion 13a of the swing bracket 13
While the lid 2 is rotated up to 90 degrees, it comes into contact with the supporting surface composed of the main part of the bearing plate 18, and holds the position occupied by the horizontal pivot 9 in a fixed manner. When the lid 2 is excessively rotated by more than 90 degrees, the main portion 13a of the swing bracket 13 is separated from the supporting surface of the bearing plate 18 as shown in FIG.

The fixed wall surface 27 of the opening 33 of the common groove to which the mounting board 23 is fixed with the bolts 22 is arranged at a right angle to the fixed wall surfaces 28 and 29, and the mounting board 23 has a ring-shaped mounting structure. The part 24 is welded. Another mounting portion 20 is provided in the bearing plate 18 fixed to the lower surface of the front end portion of the lid 2 as a through hole. Tension member 21
Is made of a metal chain, and a connecting metal fitting 26 that is inserted and locked to the mounting portion 20 is fixed to one end, and a connecting metal fitting 25 that is inserted and locked to the mounting portion 24 is fixed to the other end.

As shown in FIG. 2, the lid opening / closing device is usually provided in front and rear with respect to one lid 2, but the number of attachments can be increased or decreased according to the size and weight of the lid 2. Further, the supporting surface with which the main portion 13a of the swing bracket 13 abuts is constituted by the bearing plate 18, but if the bearing portion of the horizontal pivot 15 is displaced downward, it may be constituted by the lower surface portion 17 of the lid 2 itself. it can.

As described above, in the gas damper drive type lid opening / closing device of the present invention, the base end portion of the lid 2 is pivotally attached to the fixed frame body 1 by the horizontal pivot shaft 3,
The base end of the swing bracket 13 is pivotally attached to the tip of the lid 2 by a horizontal pivot 15, and the tip of the swing bracket 13 on the opposite side of the horizontal pivot 3 with respect to the horizontal pivot 15 has the cylinder 7 of the gas damper 6 attached thereto. The mounting end 8 is pivotally attached to a horizontal pivot 9, and the horizontal pivot 3
At the lower position, the mounting end 11 of the rod 10 of the gas damper 6 is pivotally attached to the fixed bearing plate 5 by the horizontal pivot 12.
Even if the lid 2 rotates beyond the specified angle, the swing bracket 13 escapes and rotates around the horizontal pivot 15, so that an excessive extension load is not applied to the gas damper 6 having the maximum length. This makes it possible to prevent the gas damper 6 from being damaged or destroyed.

Further, in the lid opening / closing device of the present invention, the attachment portion 20 of the tension member 21 is provided at the tip of the lid 2, and the attachment portion 24 of the tension member 21 is provided on the fixed wall surface 27 located on the tip end side of the lid 2. When the lid 2 tries to rotate to an angle that cannot be absorbed by the escape rotation of the swing bracket 13, the tension member 21 provided between the mounting portions 20 and 24 is tensioned to prevent the lid 2 from rotating. The double-prevention means for preventing excessive expansion of the gas damper 6 is provided so that damage or destruction of the gas damper 6 can be prevented more accurately.

When the worker closes the lid 2 from the opening 33 such as the common groove, one end of the pulling member 21 attached to the tip of the lid 2 is pulled to reduce the reaction force of the gas damper 6. By contrast, the lid 2 can be closed easily and lightly with a comparatively small force.

[Brief description of drawings]

FIG. 1 is a front view of a gas damper drive type lid opening / closing device according to an embodiment of the present invention in a lid closed state, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. It is a front view in the state where the lid was opened excessively. FIG. 4 is a front view of a conventional gas damper drive type lid opening / closing device. 1 ... Fixed frame, 1a ... Bearing plate, 2 ... Lid, 2a ... Bearing plate, 3 ... Horizontal pivot, 4 ... Mounting substrate, 5 ... Fixed bearing plate, 6 ... Gas damper, 7 …… Cylinder, 8 …… Mounting end, 9 …… Horizontal pivot, 10 …… Rod, 11 …… Mounting end, 12 …… Horizontal pivot, 13 …… Swing bracket, 14 …… Bearing tube, 15… … Horizontal pivot, 16 …… Bearing plate, 17 …… Bottom surface,
18 …… Bearing plate, 19 …… Base plate, 20 …… Mounting part, 21 …… Tensioning member, 22 …… Fixing bolt, 23 …… Mounting board, 24 …… Mounting part, 25 …… Coupling metal, 26 ...... Couplings, 27 …… Fixed wall, 28 …… Fixed wall, 29 …… Fixed wall, 30 …… Stoppers,
31 …… Stoppers, 32 …… Stoppers, 33 …… Opening of joint groove,
34 …… Receiving frame, 35 …… Pedestrian side

Claims (1)

[Scope of utility model registration request] 1. A base end of a lid 2 is pivotally attached to a fixed frame 1 by a horizontal pivot 3, and a base end of a swing bracket 13 is pivotally attached to a tip end of the lid 2 by a horizontal pivot 15. The mounting end 8 of the cylinder 7 of the gas damper 6 is pivotally attached by the horizontal pivot 9 to the tip of the swing bracket 13 on the opposite side of the horizontal pivot 3 with respect to the pivot 15, and the gas damper is positioned below the horizontal pivot 3. The mounting end 11 of the rod 10 of 6 is pivotally attached to the fixed bearing plate 5 by the horizontal pivot 12, and the lid 2 is rotationally biased in the opening direction by the pressure of the gas sealed in the cylinder 7, and the tip of the lid 2 is rotated. The attachment part 20 of the tension member 21 is provided in the
On the fixed wall surface 27 located on the tip side of the
A gas damper drive type lid opening / closing device in which 24 is provided and a tension member 21 that is tensioned when the lid 2 rotates beyond a specified angle is installed between the mounting portions 20 and 24.