JPH0439344Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an opening/closing device for heavy lids such as grating lids installed at the entrances and exits of communal ditches opened on sidewalks.

[Prior art] Two or three people are required to rotate the grating lid, which is heavy overall, around the horizontal axis at the base end by inserting a metal rod for the screw, which requires a lot of work. requires a lot of time and effort. Additionally, during this opening operation, the metal rod may come off and the lid may unexpectedly fall down and rotate, resulting in accidents such as getting one's foot caught between the lid and the receiving frame, resulting in injury.

[Problems to be solved by the invention] Therefore, the purpose of the invention is to enable the opening and closing operations of heavy lids such as grating lids to be carried out easily and safely with a minimum number of personnel, and to open and close heavy lids in a predetermined manner. It is an object of the present invention to provide an opening/closing device that can be accurately restrained and held in position.

[Means for Solving the Problems] As explained below using reference numerals in the attached drawings, the heavy lid opening/closing device of the present invention has a heavy lid 1 that rotates to open and close around a horizontal pivot 2 at its base end. A rail frame 3 is fixed in parallel to the lower surface, and a rail frame 3 is arranged below the rail frame 3, and its base end is pivoted to a fixed frame body 6 by a horizontal pivot 4 at a position below the horizontal pivot 2. and a horizontal pivot 7 at the tip of the arm 5.
The mounting end 9 of the cylinder 8 is pivotally connected by the
At a position below the horizontal pivot 4, the mounting end 11 of the rod 10 is pivoted to the fixed frame 6 by the horizontal pivot 12, and the heavy lid 1 is constantly held by the pressure of the gas sealed in the cylinder 8. A gas damper 13 rotationally biased in the opening direction, a roller 14 protruding from the upper surface of the tip end of the arm 5 and fitted to the rail frame 3 so as to be freely movable, and a roller 14 fixed to the rail frame 3. It consists of a fixed stopper 29 that abuts, and a sliding stopper 33 that is fitted into a guide body 32 provided on the rail frame 3 or the heavy lid 1 and moves back and forth within the rail frame 3 so as to approach or abut the roller 14. The rotational force in the opening direction by the damper 13 is set to a certain limit smaller than the rotational force in the closing direction due to gravity of the heavy lid 1, and when the heavy lid 1 is opened to a predetermined position, the roller 14 is fixed to the stopper 29.
and the sliding stopper 33.

[Function] The heavy lid 1 is always urged to rotate in the opening direction by the gas damper 13, but the rotational force in the opening direction by the gas damper 13 is more constant than the rotational force in the closing direction due to the gravity of the heavy lid 1. Since the limit is set small, the heavy lid 1 is stably held in the closed state.

The heavy lid 1 is manually operated so as to cancel out the difference between the rotational force in the closing direction and the rotational force in the opening direction.
When the end of the arm 5 is pulled up and the end of the opening rotation is applied, the rod 10 of the gas damper 13 extends from the cylinder 8, and the roller 14 at the end of the arm 5 presses the rail frame 3 upward, which reduces the weight. The lid 1 begins to open and rotate around the horizontal pivot 2.

As the opening rotation of the heavy lid 1 progresses, the pressing point of the roller 14 on the rail frame 3, that is, the point of application of force on the heavy lid 1, moves from the tip end side to the base end side and rotates around the horizontal pivot 4. The gas damper 13, which rotates around the arm 5 and the horizontal pivot 12, gradually rises.

Gas damper 13 as shown by the chain line in FIG.
At the final stage when it rotates upward around the horizontal axis 12 and crosses the vertical plane erected on the horizontal axis 12 by about 10 degrees toward the horizontal axis 4, the heavy lid 1 is rotated as shown by the chain line in Fig. 1. It is opened until it reaches a 90 degree angle to the horizontal plane, allowing free access for workers.

When the heavy lid 1 is opened to a predetermined angle in this manner, the roller 14 rolling within the rail frame 3 comes into contact with the fixed stopper 29. Here, the sliding stopper 33 is slid toward the rail frame 3 along the guide body 32, and the tip of the sliding stopper 33 protruding into the rail frame 3 is placed on the roller 14 on the opposite side from the fixed stopper 29. be brought close to or in contact with.

As shown in FIG. 5, the roller 14 is disposed between the fixed stopper 29 and the sliding stopper 33.
is prevented from moving forward by the fixed stopper 29, while being prevented from returning by the sliding stopper 33, the expansion and contraction of the gas damper 13 is prevented, and the heavy lid 1 is restrained in the open position. Ru.

The sliding stopper 33 is moved back to the chain line position in FIG.
After releasing the restraint, when the worker pushes down the tip of the heavy lid 1, the rod 1 of the gas damper 13
0 retreats into the cylinder 8 against the gas pressure,
The arm 5 and the gas damper 13 rotate in the direction of collapse around each horizontal axis, the roller 14 rolls within the rail frame 3 toward the tip, and the heavy lid 1 moves to the original position shown by the solid line in FIG. Rotates back to closed position.

[Embodiment] In the illustrated embodiment, the heavy lid 1 is a grating lid, and when the lid is closed, it is dropped into an upper receiving frame 17 of an entrance/exit 16 opened in a sidewalk 15. The horizontal pivot 2 of the heavy lid 1 is supported at both ends by the receiving frame 17. The flat plate-shaped fixed frame 6 is fixed to the inner wall 18 of the entrance/exit 16 with bolts 19.

An arm bracket 20 supporting the horizontal pivot 4 of the arm 5 is fixed to the upper end of the fixed frame 6 by welding. Horizontal axis 12 of gas damper 13
A lower damper bracket 21 supporting the lower damper bracket 21 is fixed to the lower end of the fixed frame 6 by welding.

The entire length of the gas damper 13 is surrounded by a bellows-shaped cylindrical cover 22 for waterproofing and dustproofing, and an upper gas damper bracket 23 is fixed by welding to the upper plate portion of the arm 5 made of channel-shaped material. The mounting bolt 25 of the bearing body 24 of the roller 14 is inserted into a through hole in the upper plate part of the arm 5.
It is fixed to the arm 5 by tightening a nut 26.

A rail frame 3 having two roller rolling grooves 27 and 28 formed on the lower surface plate is fixed to the lower surface of the heavy lid 1 by welding. A fixed stopper 29 is secured to approximately the middle of the rail frame 3 with bolts 30 and nuts 31.

The cylindrical guide body 32 has its tip fixed to the fixing block 3.
It is welded and fixed to the lower surface of the heavy-duty lid 1 via the rail 9, and its base end is welded and fixed to the side surface of the rail frame 3 at right angles. The tip of the round bar-shaped sliding stopper 33 is inserted into a pair of side holes 34, 34 of the rail frame 3 when the roller 14 is restrained. The guide body 32 is provided with a longitudinal slot 35, and at both ends of the slot 35, stop grooves 36, 37 with a center angle of 90 degrees are provided in the circumferential direction.

An operating handle 38 is provided in the middle of the sliding stopper 33 in a radial direction. The operating handle 38 moves along the slot 35 and the roller 14
In the stopping position of the roller 14, it engages with the stop groove 36 on the proximal end side, and when the roller 14 is in the release position, it engages with the stop groove 37 on the distal end side.

In this embodiment, the opening/closing device is installed on both the left and right sides of the heavy lid 1, but depending on the weight and structure of the heavy lid, the opening/closing device may be installed only on one side of the heavy lid.

[Effects of the invention] As described above, the heavy lid opening/closing device of the invention has the following advantages:
The rotational force in the opening direction by the gas damper 13 counteracts most of the rotational force in the closing direction due to the gravity of the heavy lid 1, and is sufficient to cancel out the difference between the rotational force in the closing direction and the rotational force in the opening direction. When a worker pulls up the tip of the heavy lid 1 with only a little force, the heavy lid 1 immediately opens and rotates, so the opening and closing operations of the heavy lid 1 can be easily performed by the minimum number of personnel with less labor burden. can be done.

In addition, in the heavy lid opening/closing device of the present invention, the heavy lid 1 is always supported from below by the gas damper 13 via the rail frame 3 and the arm 5.
Unlike the conventional device, there is no danger that the metal rod for the screw comes off from the insertion part and the heavy lid falls unexpectedly, and the heavy lid 1 can be opened and closed safely without fear of injury.

Furthermore, in the heavy lid opening/closing device of the present invention, the heavy lid 1
Fix the rail frame 3 in parallel to the bottom surface of the rail frame 3.
The base end of the arm 5 disposed on the lower side is pivoted to the fixed frame 6 by the horizontal pivot 4 at a position below the horizontal pivot 2 of the heavy lid 1, and the mounting end of the cylinder 8 of the gas damper 13 is 9 is pivotally attached to the tip of the arm 5 by the horizontal pivot 7, and the mounting end 11 of the rod 10 of the gas damper 13 is pivoted to the fixed frame 6 by the horizontal pivot 12 at a position below the horizontal pivot 4. Since the roller 14 protruding from the upper surface of the tip of the arm 5 is fitted into the rail frame 3, a suitable boosting mechanism is constructed, and as a result, the biasing force of the gas damper 13 is relatively small. Therefore, by using a small and inexpensive gas damper, the manufacturing cost of the entire switchgear can be reduced.

In addition, the heavy lid opening/closing device of the present invention has a heavy lid 1
When the heavy lid 1 is in a predetermined open position, the roller 14 is disposed between the fixed stopper 29 and the sliding stopper 33, and the sliding stopper 33 prevents the roller 14 from moving backward. is accurately restrained and held in the open position, and there is no risk of the heavy lid 1 being closed unexpectedly when a worker is entering or exiting the door, and the forward movement of the roller 14 is stopped by the fixed stopper 29. There is no danger that the gas damper 13 will be overextended due to excessive opening rotation of the lid 1 and damage to the connecting portion between the rod and the piston, and the gas damper 13 can operate stably over a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a front view of a heavy-duty lid opening/closing device according to an embodiment of the present invention in a lid closed state, and FIG. 2 is an enlarged left side view with a part of the opening/closing device omitted. FIG. 3 is a left side view of the stopper mechanism of the opening/closing device, FIG. 4 is a front view of the stopper mechanism, and FIG. 5 is a sectional view of the stopper mechanism in use. 1... Weight lid, 2... Horizontal pivot, 3... Rail frame, 4... Horizontal pivot, 5... Arm, 6 Fixed frame body, 7... Horizontal pivot, 8... Cylinder, 9...
Mounting end, 10... Rod, 11... Mounting end,
12...Horizontal axis, 13...Gas damper, 14
...Roller, 15...Sidewalk, 16...Entrance/exit, 1
7... Receiving frame, 18... Inner wall, 19... Fixing bolt, 20... Arm bracket, 21... Damper bracket, 22... Bellows type cylindrical cover, 2
3...Gas damper bracket, 24...Bearing body, 25...Mounting bolt, 26...Nut, 2
7, 28...Roller rolling groove, 29...Fixing stopper, 30...Fixing bolt, 31...Nut,
32... Guide body, 33... Sliding stopper, 34
...Side through hole, 35...Slot hole, 36, 37...Stop groove, 38...Operation handle, 39...Fixing block.

Claims (1)

[Scope of utility model registration request] a rail frame 3 fixed in parallel to the underside of a heavy lid 1 which rotates to open and close around a horizontal pivot 2 at its base end; an arm 5 arranged below the rail frame 3 and pivoted at its base end to a fixed frame body 6 by a horizontal pivot 4 at a position below the horizontal pivot 2; a gas damper 13 having a mounting end 9 of a cylinder 8 pivoted to the tip of the arm 5 by a horizontal pivot 7 and a mounting end 11 of a rod 10 pivoted to the fixed frame body 6 by a horizontal pivot 12 at a position below the horizontal pivot 4, which constantly urges the heavy lid 1 to rotate in the opening direction by the pressure of gas sealed in the cylinder 8;
a roller 14 which is fitted to the rail frame 3 so as to be freely movable; a fixed stopper 29 which is fixed to the rail frame 3 and against which the roller 14 abuts; a sliding stopper 3 which is fitted into a guide body 32 provided on the rail frame 3 or the weight cover 1 and which moves forward and backward within the rail frame 3 so as to approach or abut against the roller 14;
The opening and closing device for a heavy lid is composed of a gas damper 13 and a roller 14 disposed between a fixed stopper 29 and a sliding stopper 33 when the heavy lid 1 is opened to a predetermined position. The opening and closing device for a heavy lid is composed of a gas damper 13 and a roller 14 disposed between a fixed stopper 29 and a sliding stopper 33 when the heavy lid 1 is opened to a predetermined position.