JPS633102B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a cover for a road inspection hole (manhole).
The present invention relates to a tightening device for a tightening device.

More particularly, the invention is directed to a road inspection hole consisting of a replaceable lid and a fixed base plate.

Gradual replacement of conventional cast unplated lids by lighter cast lids with flexible or spheroidal graphite will prevent unintended lid retention resulting from heavy vehicle traffic, for example, on lighter lids. It will be necessary to provide a fastener device to prevent lifting.

Some types of clamping devices use radial fingers that are fixed to the lid and cooperate with complementary chambers made in the ears of the bottom plate, like the insertion of a light bulb socket.

In use, on the one hand, the person handling this type of lid often forgets to provide its clamping device, and on the other hand, the vibrations caused by the repeated passing of lorries tend to rotate the lid in the loosening direction. This appears to be the case, and this results in accidents involving cars and people.

To correct this, it is therefore desirable to provide a rotational tightening device for the lid, which complements the fastening device on the bottom plate.

auxiliary tightening consisting of a flat upper plate that closes the ears in the tightening position and a replaceable wrench rotating about a vertical axis with a radial finger adjustment of the lid and a coupling device with the bottom plate; Clamping devices with attachment devices are already known. This wrench, which is independent of the two other elements of the manhole, is left behind during the operation of the cover, so that the cover cannot be hooked by the clamping device after it has been placed back on the bottom plate. Moreover, it happens that one does not reposition the bottom plate after lifting the lid, since it is very difficult to remove.

The object of the invention is to provide an auxiliary tightening device which ensures effective tightening of the lid, regardless of stress or external force, without human intervention.

For this purpose, this auxiliary clamping device consists of a pallet connected on a horizontal shaft extending the radial fingers of the clamping device, fixedly mounted on the shaft, and with at least one end On one side, it has a support surface suitable for being supported on the wall facing the ear.

This pallet, connected laterally on the lid, occupies a vertical position in which the lid can be rotated relative to the bottom plate, on the one hand, in order to ensure either the hanging of the clamping device or its release. and, on the other hand, occupy a horizontal position which prevents the rotation of this lid and thus prevents the radial fingers from escaping the ear beak, which prevents an accidental lifting of the lid. Make it. It is noteworthy that any vehicle passing over the pallet tends to keep it in a horizontal position. This prevents the pallet from being lifted.

Such a device provides complete satisfaction in the position of hanging the fastener device, such as in the open position. However, passing from one of these positions to the other,
Deposits of finely divided material, such as sand, dirt or dirt, can be disturbed by entering between opposing surfaces. This build-up, which increases friction,
Greater stress is required to guide the lid into the open position, such as to bring it into position in a fastening device and engage the fastening device or to ensure tightening.

In an embodiment of the invention, the substantially horizontal surface of the inner stepped wall with which the ear is provided is made, at least locally, at the end of the replaceable lever, together with the underside of the free end of the pallet. The pallet has a recess delimiting the passage of the hook, while on the back of the part to be connected, the pallet is provided with a section forming the lateral surface of the catch, which, in the opening phase of the pallet, allows the hook-shaped part to suitable for cooperating with a notch made in the end of said lever, opposite to. On the back of the similarly notched part, said lever has a cam-shaped profile suitable for resting on the edge of the ear, facing the edge of the stepped wall, and on the other end, a cam The rounded dorsal part forming the is suitable for the clamping device of the lid during the rotational phase and contacts the corresponding surface of the stepped wall of the ear when the hook cooperates with the radial fingers. It has a second hook suitable for

Due to the combination of the provision of stepped walls and pallets, on the one hand, and the shape of the interchangeable levers, on the other hand, the rotation of the closure as well as
Rotating the opening of the lid and disengaging the clamping device is made easier even though deposits or particulate matter tend to impede its movement.

In the case of application to a fastening device, which has at least one finger projecting radially from the lid and is suitable to be supported below the beak projecting inside the ear of the bottom plate, this fastening Other features and advantages will become apparent from the description of embodiments of the apparatus, with reference to the accompanying drawings, which are shown by way of non-limiting example.

In these figures 2 designates the bottom plate of the road inspection hole and 3 its lid, the fastening device on said bottom plate consisting of at least one and in particular two fingers 4, the fingers 4 protruding radially from its periphery;
beaks 5 each protruding inside a corresponding ear 6 of the bottom plate;
suitable for working with. In a known manner, the bottom plate has an inner web 11 which forms a support for the lid 3, with or without the interposition of a joint (not shown).

According to the invention, the device consisting of the fastening device of the lid 3 on the base plate 2, the finger 4 and the beak 5 of the ear 6 is completed by an auxiliary device consisting of the pallet 7. This pallet is connected around a horizontal axis 8, which projects laterally into the extension of the finger 4 of the corresponding clamping device. As shown in more detail in FIG. 2, each shaft locally has a flattened portion 8a whose plane abuts the bottom of the throat 9, which throat 9 is created between the so-called shaft and the finger 4. In this embodiment, and as shown in FIG. A hole 13 with the same diameter as the diameter is made in this part. This hole has a crescent-shaped object 14 (shown in FIGS. 3 and 6) which projects into the part of the hole that is rearward when the pallet is mounted on the shaft 8 of the inspection hole. Locally this hole 13 is given a lateral contour equal to the lateral contour of the axis 8.

The position of the pallet relative to the lid 3 as shown in FIG.
That is, when occupying a position rotated by 180 DEG with respect to this clamping device, the pallet can be easily placed on the shaft 8, in which case its lateral parts correspond exactly to the lateral parts of the shaft 8. As soon as the bearing 12 of this pallet is correctly engaged on this shaft 8, the crescent-shaped object 14 is in the throat 9 of the shaft 8. Since it has the same length as this throat, it does not interfere with the rotation of the pallet relative to the axis 8. This crescent-shaped object therefore forms a kind of permanent kotta, which, as shown in FIGS.
In cooperation with the front edge of the clamping pallet 7, its shaft 8
disengagement of the pallet and allow the pallet to occupy a position different from its installed position. Of course, the crescent-shaped objects are each chosen to correspond to the position of use of this pallet, the vertical gripping position shown in FIG. 7, and the horizontal clamping position shown in FIG.

With this simple construction arrangement, the pallet can be
and cannot be interrupted during operation of the lid on the outside of the base plate 2.

As shown in FIGS. 3 and 4, this pallet 7 likewise has, near its other end, a lateral lower web 15 offset relative to its free end.

When this clamping pallet is placed on the lid 3 and assumes the vertical position shown in FIG. Lift it up so that the lid can be oriented so that the fingers 4 are approximately above the ears 6 of this bottom plate. When the lid 3 is in this position, it is lowered into the opening in the base plate 2, while its fingers 4 pass through the ears 6, as shown in FIG. In order to hook the clamping device in the access hole in a known manner, the access hole is moved around the vertical axis in the direction of arrow 18 in FIG. It is sufficient to rotate it. At this time, the tightening pallet 7 can be lowered into the ear. In this position, resting against the ear wall 19 opposite the wall 20 from which the beak 5 projects, the pallet prevents any movement of the lid in the direction of the arrow 21 in FIG. That is, the finger 4 is prohibited from escaping from below the beak 5, and the lid is therefore prevented from loosening unexpectedly.

In particular, and to facilitate the hanging of the clamping device on the lid, each finger 4 has a surface 4a on its top;
The surface 4a is laterally inclined and gives the finger the general shape of a wedge; this surface is suitable for cooperating with an auxiliary surface 5a made below the ear beak 5. In this embodiment, the pallet 7 is provided at its free end with a wedge-shaped part suitable for cooperating with the corresponding inner surface of the ear in order to push the radial fingers 4 under the beak 5. ing. More precisely, as shown, the pallet is provided at its free end with a nozzle 22 having a side surface 22a and a width l that decreases from the top of the pallet to the bottom end of the web 15. This nozzle is used to cooperate with the surface 23 of the chamber of additional dimensions and shape, which opens into the inner surface 24 of the wall 19 of the ear.

In this arrangement, when the pallet 7 is rotated in the direction of the arrow 25 in FIG.
Even when not fully engaged downwards, its nozzle 22 transmits to the lid a rotational movement in the direction of the arrow 18, which favors the downward engagement of the wedge 4 of the corresponding beak 5; Works with face 23.

As shown in FIG. 1, the wall 19 of the ear 6 has a stepped wall 28 which bears against the free end of the pallet. This stepped wall extends towards a web 29 which forms a continuation of the peripheral wall of the ear. As shown in FIG. 8, the inner surface 29a of this web, together with the surfaces of the lateral edges of the pallet 7, delimits the cavity 30 when the pallet is in a horizontal position. When it is desired to remove the clamping device, this gap 30 allows the introduction of a pickaxe plank to lift the pallet.

Furthermore, FIGS. 3, 4, 9 and 10
As shown in the figure, the pallet has, on its back and above the part forming the bearing 12, a vertical recess 32, when said pellet is in a vertical position after being lifted by the plank of the pickaxe. 32, together with the inner surface of this ear wall 20, delimits a vertical cavity 33. This gap 33 is used to introduce a pickaxe, which, due to its wedge-shaped shape, transmits a rotational movement in the direction of the arrow 21 throughout the pallet and the lid 3, which rotational movement favors loosening the lid 3. Make it.

Finally, and in order to avoid the penetration of various substances into the cavity formed by the ear 6, the free end of the pallet, i.e. the part supporting the web 15, has an amount d (approximately the thickness of the beak 5 of the ear). Figure 10) only,
It is wider than the shaped portion of the bearing 12 connected on the shaft 8. In this way, the inner side surface 7a of the pallet, which is concave, can be approached very close to the peripheral surface 3a of the lid 3.

Similar to the simple concept of the ears 6 of the bottom plate 2, the shafts 8 and the corresponding fingers 4 of the lid 3, this clamping pallet obtained directly from the foundry cannot be lifted unexpectedly and It is noteworthy that the clamping action of the clamping device of the lid on the bottom plate 2 is completely ensured while forming the grasping and operating device of the inspection hole. Additionally, the pallet forces a person to tighten the lid fasteners when the lid is placed on the base plate.

The embodiment of this clamping device described with reference to FIGS. 11 to 16 relies on a replaceable lever 44 to actuate the pallet 7 even in the presence of finely divided deposits that would disrupt the movement. It is distinguished from the foregoing only by its detailed arrangement, which makes it possible to do so. For this purpose, and as shown in FIG.
It has a recess 40, while as shown in FIG.
The pallet 7 has holes 13 on the back of the part.
It has a section 42 which, together with the upper surface 42a of the pallet, forms a lateral catch surface 43. As will be explained in more detail later, these recesses and cuts facilitate the tightening and loosening operations, as well as the operation of engaging and disengaging the clamping device of the lid with respect to the bottom plate 2, using a replaceable wrench 44. Used to cooperate with various parts.

The spanner 44 shown in FIG.
has. The part of the wrench that has this notch is
It has a cam-shaped profile 47 on its back.
The spanner 44 has another hook 48 at the other end, and the hook 4
The back 49 of 8 is likewise rounded to form a cam.

This improvement for loosening the clamping device of the lid makes it possible for the pallet 7, FIG. As shown in FIG.
It is sufficient to introduce a hook 48 made at the upper end of the lever 44. As soon as the hook engages below the free end of the pallet 7 in this way, in order to rotate the pallet in the direction of the arrow 50, it is necessary to guide the cam toothing 49 against the inner surface of the wall 19 and to rotate the pallet in the direction of the arrow 52. It is sufficient to transmit the rotational movement to the lever.

When the pallet 7 is lifted, and if it still proves very difficult to rotate the pallet by hand, the lever 44 is used by the other end. In this state, its hooked portion 45 engages the free end of the pallet 7, as shown in FIG. It is directed against the top surface of this pallet. At this time, the lever is rotated in the direction of arrow 53 in FIG.
As soon as the cam-shaped part 47 meets the inner edge of the ear wall 20 and rests on this edge, the pallet 7 and thus the inspection hole 3 undergoes a movement in the direction of the arrow 54 in FIG. . This movement is caused by the beak 5 of the clamping device.
causes the removal of the radial fingers 4 below.
As soon as all radial fingers 4 have been removed from the beak 5, the lever 44 is pulled back. In this case, the web 15 of the lid forms a gripping device. It can be lifted simply by using the pallet 7.

It is noted that the hook 48 of the lever 44 can be used again to facilitate the engagement of the clamping device of the lid 3 on the inspection hole 2, even in the presence of fine powder deposits between the two facing elements. FIG. 16 shows. In this state, by means of the back part 49 which partially envelops the corresponding radial finger 4 and forms a cam,
The hook is arranged so as to be in contact with the substantially horizontal surface 24 of the stepped wall 28. By rotating the lever 44 in the direction of arrow 55 in FIG.
It is easy to see that the hook 48 transmits to the radial finger 4 and the lid 3 the movement which results in the engagement of the lid clamping device. In order to reach the position shown in FIG. 14, it is sufficient to lower the corresponding pallet 7.

Relying on a specially shaped lever, the combination of stepped walls of the ears and equipment provided on the pallet can be used when dust deposits, dirt and debris between the opposing surfaces make this operation difficult. Even then, it arises from the foregoing to be able to ensure the loosening of the lid to the inspection hole, the removal of the clamping device and the hanging of the clamping device.

[Brief explanation of the drawing]

1 and 2 are partial perspective views showing an embodiment of the ears of the bottom plate and the finger of the inspection hole, respectively.
Figures 4 and 4 are perspective views of the clamping pallet under two different angles, Figure 5 is a sectional view along line 5--5 in Figure 3, and Figure 6 is installed on the lid. 7 and 8 show the position occupied by the tightening pallet in the vertical position of the ear and in the horizontal position of the tightening, respectively. 7 in Figure 1 showing
FIGS. 9 and 10 are partial sectional views along line 7, FIGS. 9 and 10 are partial perspective views of the tightening device in the positioning and tightening stages, respectively, and FIG. FIG. 12 is a partial perspective view of another embodiment of the ear of the bottom plate when it is in operation; FIG.
Figure 3 is the drawing next to the side view of the replaceable lever.
Figures 14, 15 and 16 are partial cross-sectional views of the tightening device, showing the initial stage of loosening, the unfastening stage, and the clamping stage, respectively. In the figure, 2... Bottom plate, 3... Lid, 3a... Peripheral surface, 4... Finger, 4a... Surface, 5... Beak, 5a...
Auxiliary surface, 6... Ear, 7... Palette, 7a... Side, 8... Horizontal axis, 8a... Flat part, 9...
Throat, 11...web, 12...bearing, 13...
Hole, 14...Crescent-shaped object, 15...Web,
19... Wall, 22... Nozzle, 22a... Side,
23... Surface, 24... Inner surface, 28... Stepped wall, 29... Web, 29a... Inner surface, 30...
...Gap, 32...Vertical recess, 33...Gap, 40
...Concavity, 42...Fault, 42a...Top surface, 43
...stopper, 44...spanner, 45...hook, 4
6... Notsuchi, 47... Cam, 48... Hook, 49
……cam.

Claims (1)

Claims: 1. A bottom plate 2 with at least one radial ear 6 and at least one ear beak 5 suitable for cooperating with an ear beak 5 that passes through the ear and prevents it from lifting. of the type consisting of a replaceable lid 3 fixed to a radial finger 4 and a supplementary rotary tightening device having a flat upper plate passing through said ear and closing the ear in the tightening position; A supplementary clamping device is coupled on a horizontal shaft 8 extending the radial fingers 4 of the clamping device;
A cover for a road inspection hole, characterized in that it consists of a pallet 7 mounted on its axis and having on at least one of its ends a support surface suitable for being supported on the opposite wall. Tightening device for fastening devices. 2. The pallet 7 is connected by one of its ends, and near the other end there is a lateral lower part suitable for being rested on the corresponding inner surface of the ear and constituting a gripping device for the lid. Device according to claim 1, characterized in that it has a web (15). 3 an upper surface 4a suitable for the radial fingers 4 to cooperate with a bearing surface 5a made in the lower part of the beak 5 of the ear 6;
laterally, while the pallet 7 at its free end cooperates with the inner surface of the ear facing the beak 5 in order to push out the radial fingers below this beak.
3. Device according to claim 1, characterized in that it has a wedge-shaped portion (22). 4. The pallet has at its free end a support nozzle 22 with side surfaces 22a and a width decreasing from the upper surface of the pallet to the lower end of the web, while the ear walls 19 open to that face opposite and have a lateral part. 4. Device according to claim 3, characterized in that it has a recess (23) having a complementary shape to the shape of the aforementioned nozzle and forming a support for the face of this nozzle. 5. The ear 6 projects from its wall 19 opposite the beak and has a supporting stepped wall 28 at the free end of the pallet, which extends towards the web 29;
Claims characterized in that the inner surface 29a of the web 29, together with the surfaces of the lateral edges of the pallet, delimits a tool introduction cavity 30 which allows its opening when the pallet is in the clamping position. The device according to any one of paragraphs 1 to 4. 6 When the pallet is in the tightening position, the part of the pallet supporting the lower web 15 is located approximately at the ear so that the inner concave side surface 7a of the pallet is very close to the peripheral surface 3a of the manhole cover 3. 6. Device according to claim 1, characterized in that it is wider than the axially connected part of the hole cover by an amount corresponding to the thickness of the beak (5). 7. The shaft 8 projecting from the manhole cover has a throat 9 tangent to a plane containing the plane of the flat part 8a, made on a section of diameter corresponding to the diameter of the hole 13 of the pallet, while 13 projects from that part around the throat 9 and forms a crescent-shaped object 14 which holds the pallet on this axis.
An apparatus according to any one of claims 1 and 2 to 6, characterized in that it has: 8. On the back of the axially connected part of the hole cover, the pallet 7 has a vertical recess 32, which allows the beak 5 to move when the pallet is brought into the vertical position of unfastening. With the protruding ear wall 20,
8. Device according to any one of claims 1 to 7, characterized in that it delimits a vertical gap 33 for the introduction of a pickaxe.