JPH0687439U - Manhole cover - Google Patents

Abstract

(57) [Summary] [Purpose] A manhole cover opening / closing jig having a T-shaped hook at its tip can be used. [Structure] In a manhole cover in which a recessed fitting portion 9 into which a hook 12 of an opening / closing jig 11 formed of a T-shaped hook 12 formed at a tip of a rod-shaped main body is inserted is formed near a peripheral portion of a manhole cover 10, A groove 11A having a width into which the rod-shaped main body of the opening / closing jig 11 can be inserted is formed in the radial direction of the manhole cover 10 on the upper surface of the concave fitting portion 9 on the peripheral edge side.
Overhanging portions 11B with which the hooks 12 are engaged are formed on both sides of the ribs, and ribs 11C are projectingly provided on the lower edge portions of the overhanging portions 11B on the center side of the manhole cover 10.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a manhole cover, and more particularly to a manhole cover that can use a manhole cover opening / closing jig having a T-shaped hook at the tip.

[0002]

[Prior art]

 It is generally adopted that a manhole cover provided on a road is taper-fitted into a receiving frame so that a vehicle running on the cover does not rattle and generate noise.

However, since the manhole cover is taper-fitted to the receiving frame, it cannot be easily opened because the manhole cover bites into the receiving frame due to traveling of a vehicle or the like. Therefore, FIG. 6 is a partial plan view of the conventional manhole cover, FIG. 7 is a cross-sectional view taken along the line AA of FIG. 6, and FIG. 8 is a cross-sectional view of the manhole cover in the portion where the prying holes are formed. As shown, insert the tip of the burl 3 or pickaxe into the prying hole 2 formed in the peripheral portion of the manhole cover 1, pry open the manhole cover 1 with the receiving frame 4 as the fulcrum of the lever, and after that, The hook 8 of the opening / closing jig 7 is hooked on the locking metal fitting 6 fixed between the opposing side walls 5A of the recessed fitting portion 5 formed near the peripheral portion of the lid 1 to pull up the manhole lid 1.

[0004]

[Problems to be solved by the device]

 In order to open the manhole cover 1 using the recessed fitting portion 5 in this way, an opening / closing jig 7 having a hook 8 is required. The opening / closing jig 7 is, for example, JIS A5506 “Manhole cover for sewer”. It cannot be used for the keyhole for opening and closing described in (a circular hole with rectangular holes formed on both sides). Therefore, two kinds of opening and closing jigs were required for such a manhole cover.

Therefore, an object of the present invention is to provide a manhole cover which can be used as it is as a manhole opening / closing jig having a T-shaped hook at its tip.

[0006]

[Means for Solving the Problems]

 According to the present invention, in a manhole cover in which a recessed fitting portion of an opening / closing tool having a T-shaped hook formed at a tip of a rod-shaped body and into which the hook is inserted is formed near a peripheral portion of the manhole cover, the recessed fitting is performed. A groove having a width into which the rod-shaped main body of the opening / closing jig can be inserted is formed on the upper surface of the peripheral portion side of the portion in the radial direction of the manhole cover, and the hook is engaged on both sides of the groove. It is characterized in that an overhanging portion to be fitted is formed, and a rib is projectingly provided on the lower surface edge portion of the overhanging portion on the center side of the manhole cover.

[0007]

[Action]

 A groove having a width into which the rod-shaped main body of the opening / closing jig can be inserted is formed on the upper surface of the manhole cover on the edge side, and overhanging portions to which hooks of the opening / closing jig are engaged are formed on both sides of the groove. A rib is formed on the underside edge of the overhanging part on the center side of the manhole cover, and a concave fitting part into which the hook is inserted is formed by a rib, which is described in JIS A5506 “Manhole cover for sewer”. The manhole cover opening / closing jig that has a T-shaped hook at the tip can be used as it is, which can be inserted into the opening / closing keyhole.

[0008]

【Example】

 Next, one embodiment of the manhole cover of the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing an embodiment of the manhole cover of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is a manhole opening / closing jig in a concave fitting portion of the manhole cover of the present invention. 4 is a perspective view showing a state where the manhole lid is fitted, FIG. 4 is a perspective view showing a rubber plug fitted into the concave fitting portion of the manhole cover of the present invention, and FIG. It is sectional drawing which shows the state fitted.

In FIGS. 1 to 3, reference numeral 9 denotes a concave fitting portion formed in the vicinity of the peripheral portion of the manhole cover 10, into which the T-shaped hook 12 (see FIG. 3) of the opening / closing jig 11 is inserted. A groove 11A having a width into which the rod-shaped main body of the opening / closing jig 11 can be inserted is formed in the radial direction of the manhole cover 10 on the upper surface of the concave fitting part 9 on the peripheral edge side of the manhole cover 10. Overhangs 11B with which the hooks 12 engage are formed on both sides of the groove 11A. A rib 11C is formed on the lower surface edge portion of the overhang portion 11B on the center side of the manhole cover 10.

In order to open the manhole cover 10 in which the concave fitting portion 9 is formed, as shown in FIG. 3, the opening / closing jig 11 is inserted into the groove 11A and the opening / closing jig 11 is opened. The character hook 12 may be engaged with the overhanging portion 11B, and the opening / closing jig 11 may be pulled up as it is. At the time of this pulling up, the hook 12 does not come out of the overhang portion 11B by being caught by the rib 11C. Therefore, the manhole cover 10 can be safely opened and closed regardless of the pulling posture of the opening / closing jig 11.

When foreign matter such as sand enters the recessed portion 9, the hook 12 of the opening / closing jig 11 may not be inserted into the recessed portion 9. Therefore, when the manhole cover 10 is not opened / closed, a rubber plug 13 as shown in FIG. 4 is fitted into the concave fitting portion 9 as shown in FIG. As a result, foreign matter such as sand does not enter the concave fitting portion 9. A protruding portion 13A is formed on the upper surface of the rubber stopper 13, and the rubber stopper 13 can be easily pulled out from the recessed fitting portion 9 by gripping the protruding portion 13A with pliers or the like.

[0012]

[Effect of device]

 As described above, according to the present invention, a groove having a width into which the rod-shaped main body of the opening / closing jig can be inserted is formed in the recessed portion into which the hook of the opening / closing jig is inserted, and the hook is formed on both sides of the groove. By forming a bulge that engages with and forming a rib on the lower edge of the bulge, insert it into the keyway for opening and closing described in JIS A5506 “Manhole cover for sewers”. It is said that the manhole cover opening / closing jig having the T-shaped hook at the tip can be used as it is, and the manhole cover can be safely opened / closed by the action of the rib regardless of the pulling posture of the opening / closing jig. It has a useful effect.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a manhole cover of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a perspective view showing a state in which a manhole opening / closing jig is fitted in a concave fitting portion of the manhole cover of the present invention.

FIG. 4 is a perspective view showing a rubber plug fitted into a concave fitting portion of the manhole cover of the present invention.

FIG. 5 is a cross-sectional view showing a state in which a rubber plug is fitted in the concave fitting portion of the manhole cover of the present invention.

FIG. 6 is a partial plan view of a conventional manhole cover.

7 is a cross-sectional view taken along the line AA of FIG.

FIG. 8 is a cross-sectional view of a manhole cover at a portion where a prying hole is formed.

[Explanation of symbols]

 1: manhole cover, 2: prying hole, 3: bar, 4: receiving frame, 5: concave fitting part, 6: locking metal fitting, 7: opening / closing metal fitting, 8: hook, 9: concave fitting part, 10: manhole lid, 11: opening / closing jig, 11A: groove, 11B: overhanging part, 11C: rib, 12: hook, 13: rubber stopper, 13A: overhanging part.

Claims (1)

[Scope of utility model registration request] 1. A manhole cover having a concave fitting portion into which the hook of an opening / closing jig having a T-shaped hook formed at the tip of a rod-shaped body is inserted near the peripheral edge of the manhole cover. A groove having a width into which the rod-shaped main body of the opening / closing jig can be inserted is formed on the upper surface of the fitting portion on the peripheral edge side in the radial direction of the manhole cover, and the hooks are engaged on both sides of the groove. The manhole cover is characterized in that a mating overhanging portion is formed, and a rib is projectingly provided on a lower surface edge portion of the overhanging portion on the center side of the manhole lid.