JPH0310204Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a flip-up and rotation type manhole cover, and particularly to a manhole cover that is characterized by a hinge mechanism that allows the cover to be flipped up and rotated with respect to a receiving frame. It is.

PRIOR ART AND PROBLEMS TO BE SOLVED Today, flip-up and pivot type manhole covers are becoming increasingly popular. This consists of a receiving frame that is installed in a fixed position at the opening of a manhole, and a part of the peripheral edge of the receiving frame that closes the opening of the receiving frame and is attached to the receiving frame using a hinge mechanism so that it can be flipped up and rotated. It is common to have a lid body.

If you use such a flip-up and rotation type manhole cover, the cover body can be evenly tapered fitted to the receiving frame, so it will not look like only one side is pushed in when it is closed. It is also effective in preventing the lid from coming off when it jumps due to impact or when the internal pressure inside the manhole increases significantly. In addition, recently, there has been an increase in the number of streets where aesthetics are particularly important, and manhole covers are often installed to match the pattern of tiles, bricks, etc. around the manhole. Since it can always be opened and closed in a fixed direction, it has the feature of being able to align the orientation of patterns or letters, etc., and this advantage is a major reason why demand has increased. I can say it.

By the way, the conventional flip-up and rotation type manhole cover has a structure in which the lower peripheral edge of the lid body and the inner peripheral part of the receiving frame are connected by an arm-shaped hinge member. That is, the upper end of the arm-shaped hinge member is connected to the lower peripheral edge of the lid, and the lower end is slidably inserted into an engaging portion that projects inward from the inner peripheral portion of the receiving frame, and Another engaging portion is formed at the lower end of the hinge member, and when the lid body is flipped up and rotated toward the open position, the hinge member is lifted upward as the lid rotates toward the open position. The engaging portion of the hinge member engages with the engaging portion of the receiving frame, thereby preventing the lid from coming off from the receiving frame.

However, in order to flip up the lid from the closed position where it is fitted into the receiving frame and rotate it to the open position, it is necessary to allow the hinge member to move considerably in the vertical direction. As a result, the length of the hinge member inevitably becomes long, and it protrudes downward from the lower end opening of the receiving frame when the lid is closed, causing many manhole cover products to be stored in a stacked state in a warehouse or transported. There was a problem with instability when doing things like this.

However, in order to keep the stacked state stable, it has been previously proposed to run multiple legs from the lower periphery of the receiving frame, but since the seating area is smaller than when they are in close contact, it is difficult to maintain stability. It is unavoidable that the quality of the product will be inferior, and the provision of such legs also increases the cost of the product.

Here, the present invention improves the hinge mechanism of the above-mentioned flip-up and rotation type manhole cover,
This structure was designed to prevent the hinge member from protruding downward from the receiving frame.

Means for Solving the Problems In order to solve such problems, in the present invention, a first hinge member and a second hinge member are combined to constitute one hinge mechanism, and the lid body is The movement stroke of the hinge mechanism that should be allowed when opening is made to be shared by each hinge member. More specifically, the manhole cover according to the present invention includes a first hinge member and a second hinge member, wherein (a) the first hinge member has an arm shape; , an upper end portion is relatively rotatably connected to a peripheral edge portion of the lid body, a lower end portion is provided to extend inside the receiving frame, and a first engaging portion is formed at the lower end portion. ,Also,
(b) The second hinge member is attached to the receiving frame so as to be movable substantially in the depth direction of the receiving frame, and includes a second engaging portion that is engageable with the first engaging portion. , when the lid body is rotated from the closed position where it closes the opening of the receiving frame to the open position and the first hinge member is moved upward, the second engaging part and the first engaging part are rotated. The first hinge member is lifted upward by the engagement and allows upward displacement of the first hinge member.

Effects of the invention In the case of a flip-up and rotation type manhole cover equipped with such a hinge mechanism, when the cover body is opened,
The upward movement stroke of the hinge mechanism accompanying the rotation is distributed between the first hinge member and the second hinge member, and the first hinge member is moved by the amount of upward movement of the second hinge member. The length of the hinge member can be shortened, and as a result, the first hinge member, and by extension the hinge mechanism, do not protrude from the lower end opening of the receiving frame when the lid is closed. This made it easier to stack them during transportation, and the stacked state was also kept stable.

Embodiments Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 shows a manhole cover 10 which is an embodiment thereof.
A plan view of the entire structure is shown, and a sectional view thereof is shown in FIG. This manhole cover 1
0 includes a receiving frame 12 in the form of an annular flat cylinder;
A lid 14 that closes the opening of the receiving frame 12 is integrated into a unit, and is installed in a fixed position at the opening of a predetermined manhole in the receiving frame 12. It is attached to the inner peripheral part of the receiving frame 12 by a hinge mechanism 16 so that it can be flipped up and rotated as shown by the arrow. An enlarged sectional view of the hinge mechanism 16 is shown in FIGS. 3 and 4, with FIG. 3 showing the lid 14 in a closed state and FIG. 4 showing it in an open state. .

As is clear from FIG. 3, the hinge mechanism 1
6 includes a key-shaped hinge arm 18 attached to the lid body 14 side and a hinge sleeve 20 having a substantially cylindrical shape attached to the receiving frame 12 side, and the hinge arm 18 is attached to the first side. As a hinge member,
Further, the hinge sleeve 20 serves as a second hinge member,
The hinge arm 18 and the hinge sleeve 20 have a connected structure.

The hinge arm 18 has, at its upper end, a circular pin-shaped engagement protrusion 22 that protrudes symmetrically on both sides in the horizontal direction, as is clear from FIGS. 5 and 6.
22, and an engaging pin portion 24, which also protrudes from the lower end on the opposite side to both sides in the horizontal direction, respectively.
24, and this engagement pin portion 24 serves as a first engagement portion. Further, at the upper end of the hinge arm 18 and at the middle portion of the engaging protrusions 22, 22, there is formed a substantially half-moon-shaped notch 26 in which a cylindrical surface portion is cut out along one chord. Further, an escape groove 28 is formed near the notch 26.

On the other hand, as shown in FIGS. 11 and 12, at the lower peripheral edge of the lid body 14, there are hanging wall portions 30, 30 extending parallel to each other inward in the radial direction.
A dead-end U-shaped engagement groove 3 is formed on the mutually opposing inner surfaces of these hanging wall portions 30 from the center side to the outer peripheral side of the lid body 14.
2 and 32 are formed to face each other in the horizontal direction. Furthermore, a retaining protrusion 34 is formed on the lower surface of the peripheral edge of the lid body 14 between the engagement grooves 32 and projects downward in a direction parallel to the engagement grooves 32 . And the engagement groove 3
2, 32 of the hinge arm 18;
As a result, the hinge arm 18 is supported in a suspended state by the groove surface on the lower side thereof, and is connected to be rotatable relative to the lid body 14 around the axis of the engagement protrusion 22. It is being done.

When connecting this hinge arm 18 to the lid body 14, the hinge arm 18 is held in a position where the lower surface of the retaining protrusion 34 shown in FIG. If the engagement protrusion 22 is pushed into the groove from the open side of the engagement groove 32, the notch 26 of the hinge arm 18 will fit into the retaining protrusion 3.
4, the engagement protrusion 22 is housed inside the engagement groove 32, and then the hinge arm 18 is rotated to the position shown in FIG.
In this state, the slope at one end of the escape groove 28 comes into contact with the retaining projection 34, thereby preventing the engagement projection 22 of the hinge arm 18 from coming off from the engagement groove 32 of the lid body 14. Become. Note that the relief groove 28 functions to avoid interference between the retaining protrusion 34 and the hinge arm 18.

On the other hand, the hinge sleeve 2 as the second hinge member
0 is slidably supported in the depth direction of the receiving frame 12 by a support arm portion 36 that projects in a C-shape from the inner circumferential surface of the receiving frame 12 toward the center. As shown in FIGS. 7 and 8, this hinge sleeve 20 has a cylindrical shape with its upper end closed, and passes through the center of its upper end plate. Engagement pin portion 2 of hinge arm 18
An insertion hole 38 is formed through which the parts 4 and 24 are inserted. As a result, the remaining portion of the upper portion of the hinge sleeve 20 has a symmetrical inwardly directed flange 40,
40, and outward flanges 42, 42 that project outward from each other are formed on both sides of the inward flanges 40. It has come to play the role of a joint.

Further, the cylindrical body portion 44 of the hinge sleeve 20
As is clear from FIG. 10, one side of the outer circumferential surface is formed into a cylindrical surface, but the remaining one side of the outer circumferential surface is formed to have a trapezoidal cross section, and this outer surface shape is As is clear from FIG. 13, this corresponds to the shape of the guide notch 46 formed in the inner space of the support arm portion 36 of the receiving frame 12. As a result of the body portion 44 being inserted into the guide notch 46, the hinge sleeve 20
is held so as to be slidable in the depth direction of the receiving frame 12 while being prevented from rotating about its axis, and the outward flanges 42, 42 are seated on the upper surface of the support arm portion 36. It is becoming possible to do so. As is clear from FIG. 7, outward flanges 48, 48 are also formed at the lower end of the hinge sleeve 20, thereby preventing the hinge sleeve 20 from coming off on either side in the depth direction. It has a unique structure. In addition, side notches 50, 50 are formed on both sides of the lower end of the body 44 of the hinge sleeve 20, and are opposed to each other in a direction perpendicular to the direction in which the outward flanges 48, 48 are formed to support the hinge sleeve 20. When assembling it to the arm part 36, as shown in FIG. 13, the mutually inward ends of the support arm part 36 are passed through the side notch 50, and then rotated 90 degrees and dropped downward. By the way,
In the assembled state, the hinge sleeve 20 is supported in a suspended state by the upper surface of the support arm portion 36.

As is clear from FIG. 3, the hinge arm 18 is positioned such that its lower end extends inside the receiving frame 12, and the engagement pin portion 24 formed at the lower end is attached to the hinge sleeve 20. It is arranged to be located inside the insertion hole 38 through the insertion hole 38, and the longitudinal direction of the insertion hole 38 and the axial direction of the engagement pin portion 24 are out of phase by 90 degrees,
The engagement pin portions 24 of the hinge arm 18 can be engaged with the lower surface of the inward flange 40 of the hinge sleeve 20.

Therefore, in the manhole cover 10 configured as described above, the cover body 1 as shown in FIG.
4 closes the opening of the receiving frame 12, but if you put your hand on the outer peripheral edge of the lid 14 on the side opposite to the hinge mechanism 16 and rotate it upward,
The lid body 14 rotates while sliding around the engagement protrusion 22 of the hinge arm 18 and pulls the hinge arm 18 upward. In the second half of the flip-up rotation, when the engagement pin portion 24 of the hinge arm 18 comes into contact with the lower surface of the inward flange 40 of the hinge sleeve 20, the hinge arm 18 moves the hinge sleeve 20 to the receiving frame 12. The lid body 14 is rotated 180 degrees to an open position in which the lid body 14 is turned over by 180 degrees and lies on its back.

In the open position, the lower end of the hinge arm 18 engages with the receiving frame 12 via the hinge sleeve 20, and the upper end of the hinge arm 18 engages with the lid body 12.
4, the inner end of the engagement groove 32 and the retaining protrusion 34
Since the lid body 14 is restrained between the support frame 12 and the support frame 12, the lid body 14 does not come off from the receiving frame 12. Also,
Since the lid body 14 is opened until it is turned over by 180 degrees, there is sufficient space for a person to enter and exit the opening of the receiving frame 12.

When the lid 14 is inverted 180 degrees in this manner, it is possible to horizontally rotate the lid 14 around the center of the insertion hole 38 of the hinge sleeve 20, and the insertion hole 38 of the hinge sleeve 20 can be rotated horizontally. If the cover body 14 is horizontally rotated 90 degrees and lifted upward until the orientation of the hole 38 and the engagement pin part 24 match, the engagement pin part 24 will come out of the insertion hole 38 and the hinge Arm 18 with hinge sleeve 20
By separating the lid body 14 from the receiving frame 12,
It can be removed from. It goes without saying that when connecting the two, the opposite operation may be performed.

Furthermore, in such a separated state, the hinge arm 1 is placed in a position where the notch 26 of the hinge arm 18 and the retaining protrusion 34 of the lid body 14 are aligned.
8 to the entrance side of the engagement groove 32, it can be easily removed from the lid body 14, and conversely, the troublesome pin connection when connecting the two can be omitted. This makes assembly and maintenance easier.

On the other hand, from the open position shown in FIG.
When closing, the lid body 14 may be rotated so as to be raised so that the outer circumferential tapered surface of the lid body 14 fits into the inner circumferential tapered surface of the receiving frame 12. In the first half of the closing process, the hinge arm 18
2, the engaging pin portion 2
When the hinge sleeve 20 suspended at 4 is slid down and its outward flange 42 is received by the support arm 36, only the hinge arm 18 is lowered and the engagement pin 24 moves toward the lower end of the hinge sleeve 20, but on the way, the lid body 14 moves toward the receiving frame 12.
It is placed in close contact with the opening of the In this closed state, since the hinge mechanism 16 does not protrude above the lid 14, the top surface of the lid 14 and its vicinity are flush with each other, and there are notches or the like on the outer peripheral edge of the lid 14. Since it does not exist, a high sealing performance is obtained, and the inflow of earth and sand etc. is effectively prevented.

By the way, when the lid body 14 is flipped up and rotated as described above, it is necessary to allow the hinge arm 18 that is pulled up accordingly to move a fairly large stroke, but in this embodiment, the vertical movement with respect to the receiving frame 12 is Because the hinge arm 18 is connected to a possible hinge sleeve 20, the length of the hinge arm 18 itself can be short. That is, if the hinge sleeve 20 is not present and the engagement pin portion 24 of the hinge arm 18 is directly engaged with the support arm portion 36 of the receiving frame 12, the support arm 36 of the support frame 12 will not be supported when the lid body 14 is closed. Arm portion 36 and engagement pin portion 2
4, it is necessary to secure a sufficient gap for the lid body 14 to be inverted 180 degrees. Therefore, the lower end of the hinge arm 18 must protrude from the lower opening of the receiving frame 12 in the closed state. It will disappear, but
As in this embodiment, the hinge mechanism is divided into the hinge arm 18 and the hinge sleeve 20, and the hinge sleeve 20 is lifted upward by the hinge arm 18. The hinge arm 18 can be shortened by the amount of movement (lift amount), and protrusion from the lower opening of the receiving frame 12 can be skillfully avoided. Therefore, when such manhole cover products are stored or transported in a stacked state, they are less likely to collapse or tilt, and the stability in the stacked state is improved.

In addition, in the embodiment described above, the hinge sleeve 20 that was slidably supported on the receiving frame 12 was provided as the second hinge member.
Alternatively, the second hinge member may be attached to the receiving frame 12 so as to be rotatable around a horizontal axis, and the engagement pin portion 24 of the hinge arm 18 may be engaged with the second hinge member. For example, in FIG. 3, the portion corresponding to the support arm portion 36 is
It is rotatably attached to the inner peripheral part of the body using a pin or the like, and the rotating part functions as a second hinge member.In that case, the second hinge member Although the receiving frame 12 is supported so as to be movable substantially in the depth direction along the receiving frame 12, substantially the same effect as that of the previous embodiment can be obtained even in this case.

Although detailed descriptions of individual members or parts will be omitted, it goes without saying that the present invention includes various modifications and improvements based on the knowledge of those skilled in the art.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a manhole cover that is an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken from FIG. 3 is an enlarged cross-sectional view showing the hinge mechanism in FIG. 2, and FIG. 4 is an enlarged cross-sectional view showing the hinge mechanism in FIG. 3 in an open state. 5 is a front view of the hinge arm, which is the first hinge member in FIG. 3, etc., and FIG. 6 is a right side view of FIG. 5. Figure 7 shows the third
FIG. 8 is a front view of a hinge sleeve that functions as a second hinge member in the figures, and FIG. 8 is a plan view thereof;
9 and 10 are a sectional view and a sectional view, respectively, of FIG. 7. FIG. 11 is an enlarged sectional view partially showing the vicinity of the engagement groove of the lid body in FIG. 3, FIG. 12 is a cross-sectional view in FIG. FIG. 3 is an enlarged plan view of the arm portion. 10... Manhole cover, 12... Receiving frame, 14...
... Lid body, 16 ... Hinge mechanism, 18 ... Hinge arm (first hinge member), 20 ... Hinge sleeve (second hinge member), 22 ... Engagement protrusion, 24 ... Engagement pin part (first engaging portion), 26...notch, 32...
Engagement groove 34... retaining projection, 36... support arm portion, 38... insertion hole, 40... inward flange,
42... outward flange, 46... guide notch,
50...Side notch.

Claims (1)

[Scope of Claim for Utility Model Registration] A receiving frame installed in a fixed position at the opening of a manhole, and a part of the peripheral edge of the receiving frame that closes the opening of the receiving frame and can be flipped up and rotated by a hinge mechanism. A manhole cover having a movably attached cover body, which forms an arm shape, an upper end portion of which is connected to a peripheral edge of the lid body so as to be relatively rotatable, and a lower end portion of which extends into the interior of the receiving frame. a first hinge member that is provided in the support frame and has a first engagement portion formed at its lower end; A second engaging portion that can be engaged with the engaging portion is provided, and the first hinge member is moved upward by being rotated from a closed position in which the lid body closes the opening of the receiving frame to an open position. and a second hinge member that is lifted upward by the engagement between the second engagement portion and the first engagement portion and allows upward displacement of the first hinge member. A flip-up and rotating manhole cover featuring