JPH072706Y2 - Lid opening / closing machine for manholes - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a lid opening / closing machine such as a manhole, and more particularly, to an improvement of a lid opening / closing machine for ensuring safety of lid opening / closing work.

[Conventional technology]

The manhole cover is usually opened and closed by using a shaft provided with a hook at the tip which is fitted and locked in the keyhole of the manhole cover, and the handle at the upper end of the shaft is held and lifted. However, since this work is performed manually, workability is poor and there is a risk of damaging the road surface near the opening of the manhole. Therefore, various types of manhole cover openers have been proposed in the past.

As a conventional lid opening / closing device for a manhole or the like, a lever type is often used because a large amount of force is required for so-called edging work for separating the lid that is in close contact with the manhole. This has a structure in which a lid hook is provided at the tip of a long shaft, and a support base that serves as a fulcrum to the edge of the manhole is provided, and an arm having a T-shaped length longer than the manhole diameter is provided at the tip of the shaft. There is also proposed a structure in which a wheel is attached to the arm and a lid hook is provided on the arm.

[Problems to be solved by the device]

However, in the conventional lid opening / closing machine for manholes and the like, since the lever opening / closing mechanism is used, the lid cannot be opened / closed with a small force unless the shaft length is increased, and the body becomes large. There was a problem. In addition, there is a drawback in that force must be constantly applied to maintain the lifted state of the lid, and that the lid movement must always be applied with acting forces in different directions of the lifting force and the pressing force.

Focusing on the above-mentioned conventional problems, the present invention is small in size, exerts a large opening / closing force, and can arbitrarily fix the lifting position of the lid,
It is an object of the present invention to provide a lid opening / closing device such as a manhole having a structure capable of preventing an unexpected movement.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, a lid opening / closing machine such as a manhole according to the present invention has a hydraulic jack mounted on a movable machine base having casters, and the hydraulic jack has a guide frame formed on the machine base. A slide frame that is guided and moved up and down is connected, and a lid holding member such as a manhole and a lid hook that is fitted and locked in a key hole of the lid are attached to this slide frame, and at least one caster is always provided with a braking means. The brake means is provided with a release means.

[Action]

According to the above configuration, the machine base is movable by the casters, but it is always stopped at the fixed position by the brake means. If you attach the lid hooks of the lid opening and closing machine that are placed on both sides of the manhole lid to the keyhole, and integrate the slide frame and the manhole and operate the hydraulic jack, you can easily lift the manhole lid by hydraulic pressure. be able to. By operating the brake releasing means to free the caster, the caster can be moved while maintaining the lifted state, and the manhole can be opened. When the desired position is reached, the releasing means may be released and the braking means may be applied to the casters to fix them. As a result, the manhole cover only needs to be pulled and moved by the operator to an arbitrary position.

〔Example〕

Hereinafter, a specific embodiment of a lid opening / closing machine for manholes according to the present invention will be described in detail with reference to the drawings.

The drawings show a lid opening / closing machine such as a manhole according to an embodiment. The lid opening / closing machine 10 has an L-shaped machine base 12, and a pair of casters 14 is attached to the lower surface of a flat plate portion of the machine base 12. Has been. The caster 14 has a fork bracket 14B having wheels 14A that are freely rotatable attached thereto so as to be horizontally rotatable with respect to the machine base 12, so that the rolling direction can be arbitrarily set. A hydraulic jack 16 having the machine base 12 as a support surface is erected on the upper surface of the flat plate portion of the machine base 12 located in the middle of the caster 14. The hydraulic jack 16 is of a manual type, and the jack head 16B at the upper end is moved up and down by hydraulic pressure by vertically moving a jack handle 16A extending in the lateral direction. A slide frame 18 formed in an inverted L shape is connected to the jack head 16B. This slide frame 18
Is a slider portion 18A arranged along the vertical direction on the back side of the vertical plate portion of the machine base 12, and an arm portion that extends horizontally above the hydraulic jack 16 from the upper end of the slider portion 18A.
18B and the jack head 16B is an arm part.
It is connected to 18B and can be moved up and down. A guide frame 20 is provided on the rear surface of the vertical plate of the machine base 12 to guide the slide frame 18 up and down.
The movement direction of the slide frame 18 that is raised and lowered via the is regulated.

At the lower end of the slide frame 18, a lid retainer 22 as a box body having an open bottom is attached on the opposite side of the caster 14 with the slide frame 18 interposed therebetween. The lid retainer 22 is adapted to be applied to the upper surface of the manhole iron lid to be lifted when the slide frame 18 descends. A lid hook 24 for lifting the manhole iron lid is provided on the lid retainer 22, which is formed of a screw rod 26 penetrating the upper surface of the lid retainer 22. The upper half of the screw rod 26 is a threaded portion, and a trilobal nut 28 is screwed into the threaded portion, and the trilobal nut 28 is placed on the upper plate of the lid retainer 22 via a washer 30. Screw rod penetrating the cover holder 22
The lower half portion of 26 is a rod portion, and a hook portion 32 is formed at the lower end thereof. The hook portion 32 has an inverted T shape, and can be lifted by being locked in the lower surface of the manhole iron cover by being inserted into a keyhole of a manhole (not shown) and then rotated 90 degrees. A direction indicator plate 34 indicating the direction of the hook portion 32 is provided on the upper end of such a screw rod 26 so that the direction of the key hole can be aligned without directly looking at the hook portion 32 when the device is attached to the manhole iron cover. ing.

Further, one of the casters 14 attached to the machine base 12 is equipped with a brake means 36 for preventing the rotation of the wheels. The brake means 36 has a ring brake 36A attached to the lower surface of the machine base 12 of the caster 14 so as to surround the tefork bracket 14B.
The coil spring 36B interposed between the 6A and the machine base 12 constantly biases the 6A so that the 6A is constantly pressed against the wheels 14A.
The ring brake 36A is provided with a guide pin 36C that penetrates the flat plate portion of the machine base 12 and comes out to the upper surface.
The coil spring 36B is wound around and attached. And machine base 12
Brake bracket 3 is attached to the guide pin 36C
6D is connected to prevent the guide pin 36C from coming off.

Brake release means 38 for releasing the brake is connected to the brake means 36 as described above, if necessary. The brake releasing means 38 is the brake bracket 36D.
Is pulled up against the coil spring 36B, the cable wire 38A is connected to the central portion of the bracket 36D and inserted into the cable guide 38B, and this is guided to the arm portion 18B side of the slide frame 18. A hand-held handle 40 is provided on the arm portion 18B so that the lid opening / closing device 10 can be lifted by hand.
By attaching C and gripping the brake lever 38C, the ring brake 36A of the brake means 36 is separated from the wheel 14A.

The operation of the lid opening / closing machine 10 configured as described above is as follows. Two lid opening / closing devices (10) are used, each of which corresponds to each keyhole position of the manhole iron lid, and the lower end hook portion (32) of the screw rod (26) is inserted into the keyhole. At the time of this insertion, the hook portion 32 is aligned with the direction of the key hole while looking at the direction display plate 34 on the upper side, and after inserting, it is rotated 90 degrees to prevent the hook 32 from coming off. Then, the trilobal nut 28 is rotated to raise the screw rod 26, and the manhole iron lid is fixed between the lid retainer 22 and the hook portion 32 so as to be crimped. After this process, operate the jack handles 16A of the lid opening / closing machine 10 on both sides to operate the jack head 16B.
And the slide frame 18 is lifted, the manhole iron cover is lifted from the manhole. At this time, since the casters 14 are constantly being braked by the braking means 36, the machine base 12 is fixed in position. From this state, the manhole iron cover is moved, but this can be easily moved by holding the handle 40, grasping the brake lever 38C to bring the wheel 14A into the free rotation state, and pulling it to the side of the manhole.

As described above, according to the present embodiment, the hook portion 32 and the lid retainer 22 are connected to the manhole iron lid, and then the hydraulic jack 16 is operated to lift the manhole iron lid. The edge cutting work is greatly simplified, and the manhole iron cover can be easily moved. Especially when the manhole iron cover is lifted with the hydraulic jack 16, the lifted position can be held, so there is no accident of dropping the manhole iron cover, and there is also a situation where the road surface near the manhole opening is damaged. Can be prevented. Then, the casters 14 are brake means 36.
Therefore, since the brake is always released and the brake is released only when the vehicle is moving, no accident occurs due to an unexpected movement. Further, when the lid hook 24 is fitted to the keyhole of the manhole iron lid, the direction is indicated by the upper direction indicating plate 34 without looking at the position of the keyhole and the hook portion 32 directly, so that workability is improved. It is getting better.

It should be noted that, before raising the manhole iron lid by the lid opening / closing device 10, it may be necessary to trim the edge. For this,
An arch window is provided on the vertical wall surface of the lid retainer 22 on the caster side, and as shown by an imaginary line in FIG. 2, a lever can be inserted and the lid opening / closing machine 10 can be lifted to perform edge cutting. The trowel bar is provided with a fulcrum pedestal, which is erected on the road surface between the pair of casters 14 to form a lever fulcrum.

[Effect of device]

As described above, according to the present invention, a hydraulic jack is attached to a movable machine base having casters, and the hydraulic jack is moved up and down by being guided by a guide frame formed on the machine base. To the slide frame, a lid holding member such as a manhole and a lid hook fitted and locked in a key hole of the lid are attached, and a brake means for constantly stopping at least one caster is provided and a release means for the brake means is provided. Therefore, it is small in size, exerts a large opening / closing force, can fix the lifting position of the lid at an arbitrary height, and can prevent an unexpected movement, which is excellent in workability and safety.

[Brief description of drawings]

FIG. 1 is a front view of a lid opening / closing machine such as a manhole according to an embodiment, FIG. 2 is a side view of the same, and FIG. 3 is a plan view of the same. 10 …… Lid opener, 12 …… Machine stand, 14 …… Casters, 16 ……
Hydraulic jack, 18 …… slide frame, 20 …… guide frame, 22 …… lid holder, 24 …… lid hook, 36 …… brake means, 38 …… brake release means.

Claims (1)

[Scope of utility model registration request] 1. A hydraulic jack is attached to a movable machine base having casters, and a slide frame which is raised and lowered by being guided by a guide frame formed on the machine base is connected to the hydraulic jack. The manhole is characterized in that a lid holding member such as a manhole and a lid hook fitted and locked in a keyhole of the lid are attached, and a brake means for always stopping at least one caster is provided and a releasing means for the brake means is provided. Lid opening and closing machine for etc.