|Publication number||US3611889 A|
|Publication date||Oct 12, 1971|
|Filing date||Jun 19, 1970|
|Priority date||Jun 19, 1970|
|Publication number||US 3611889 A, US 3611889A, US-A-3611889, US3611889 A, US3611889A|
|Inventors||Levinson Louis E|
|Original Assignee||Int Mfg Co|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (5), Referenced by (39), Classifications (5)|
|External Links: USPTO, USPTO Assignment, Espacenet|
United States Patent Inventor Louis E. Levinson Dallas, Tex. Appl. No. 47,654 Filed June 19, 1970 Patented Oct. 12, 1971 Assignee International Manufacturing Company Garland, Tex.
MANHOLE EXTENSION 5 Claims, 4 Drawing Figs.
US. Cl 94/34, 220/ 3.7 Int. Cl E02d 29/14 Field of Search 248/D1G. 6, 274, 239, 243; 220/34, 37; 52/21  References Cited UNITED STATES PATENTS 1,275,725 8/1918 Newton 220/37 1,751,194 3/1930 Elsy 94/34 2,445,197 7/1948 Wiesmann a 94/34 X 2,593,918 4/1952 Redman 94/34 3,246,582 4/1966 Wade 94/34 X Primary Examiner-Jacob L. Nackenoff Att0rneyWalter J. J agmin ABSTRACT: A manhole cover holder extension mountable in any one of several vertically adjustable positions in a manhole cover holder for holding a manhole cover in a raised position upon the raising of the top surface of a road by the adding of a top layer of asphalt or the like over the top surface of the original road.
PATENTED mm 1 2.12m 39 611.889
INVENTOR. LOUIS E. Levlnson ATTORNEY MANHOLE EXTENSION This invention relates to roads and more particularly to an extension for a manhole cover holder.
An object of this invention is to provide a new and improved manhole cover holder or support for supporting a manhole cover at the level of the top surface of a roadbed at locations wherein the usual original manhole cover holder would cause the manholeoover to be positioned below the top surface of the road.
Another object is to provide a manhole cover holder extension whose cylindrical body, provided at its upper portion with an annular upwardly facing support surface for supporting peripheral portions of a manhole cover, has vertically adjustable support means thereon for engaging an upwardly facing surface of the original manhole cover holder to position the support surface in any one of a plurality of vertically adjusted positions relative to the original cover holder whereby the top surface of the cover may be positioned in substantially the same place as the top surface of the road.
Still another object is to provide a manhole cover holder extension having a plurality of sets of vertically and circumferentially spaced apertures and support means, such as brackets, securable to the exterior of the extension in any one of a plurality of vertically adjusted positions for supporting the extension in the original cover holder.
Additional objects and advantages of the invention will be readily apparent from the reading of the following description of a device constructed in accordance with the invention, and reference to the accompanying drawings thereof, wherein:
P16. 1 is an exploded perspective view of a manhole having the original usual manhole cover holder, the extension embodying the invention, and the cover;
FIG. 2 is a top view of the extension;
FIG. 3 is a bottom view of the extension; and
FIG. 4 is a vertical sectional view showing the extension in position in the original cover holder and supporting a manhole cover.
Referring now particularly to the drawings, the manhole cover holder extension embodying the invention is shown as used with a manhole cover holder for holding a manhole cover 12 in a position substantially in horizontal alignment with the top surface of a orad 14. The cover holder 11 is of a conventional type having a bottom annular plate 15 which extends radially outwardly from the bottom portion of its vertical cylindrical body 16. The body at its upper end has an upper external flange 17 which extends radially outwardly from the top edge of the cylindrical body. Circumferentially spaced vertical brace plates 18 extend radially outwardly from the cylindrical body and are connected to the top flange 17 and the bottom plate 15. The body 16, the flange 17, the plate 16 and the brace plates 18 are integral.
The bottom flange 15 is secured to the cylindrical liner 20 of the manhole which is formed of concrete and opens at its bottom end to a drainage pipe, utility conduit and the like. The liner 20 has bolts 21 embedded therein which extend upwardly through suitable apertures in the bottom plate 15 of the manhole cover holder 11. The cover holder is secured to the bolts and the liner by means of nuts 22 threaded on the upper ends of the bolts.
Preferably, the top level of the concrete road 23 is integral with the manhole liner 20 and the concrete may extend into the spaces between the bottom plate 15 and the top flange 17 and between the reinforcing brace plates 18. The top surface of the road 23 at the time the road 23 is built is made flush or level with the top surface of the top flange 17 of the manhole cover holder 10.
The manhole cover holder has an internal annular flange 26 on which the outer peripheral flange surfaces of the manhole cover 12 are adapted to rest to hold the manhole cover as substantially the same level the top surface of the manhole cover and the top surface of the concrete road 23.
As the concrete road wears, it is often times necessary to cover the concrete road'with a layer 30 of asphalt or the like, as illustrated in FIGS. 1 and 4. In this case, if the manhole cover 12 still rests upon the internal annular'flange 26 of the manhole cover holder originally installed and secured to the road 23 and the manhole liner 20, obviously, the top surface thereof will be substantially below the top surface of the asphalt layer. As a result, the wheels of vehicles traveling over the road will drop down into the depressions. thus formed and cause accidents and damage to the vehicles.
The manhole cover holder extension 10 is used to support the manhole cover at a raised position so that its surface will be at the same level or in the same plane as the top surface 0 the added asphalt coating or layer 30. The extension 10 includes a cylindrical body 32 provided with several sets 33a, 33b....33n of radial apertures 34. The apertures of each set 33a-33n are preferably not aligned vertically, but in circumferentially staggered relation so that no aperture 34 of a set 33 is directly above or below anotheraperture 34 of the set.
A plurality of angle support brackets 36 aremounted on th tubular body by means of bolts 37 each of which extends through an aperture 34 which is aligned with an aperture of the vertical leg 39 of one of the brackets 36. Nuts 40 are threaded on the outer ends of the boltsto rigidly secure the brackets 36 to the tubular body 32. The vertical portions 39 of the mount brackets may of course be arcuate to conform to the outer cylindrical configuration of the body 32.
It will be apparent that the holes 34 of the several sets of holes 33a are aligned horizontally so that the brackets 36 are secured in circumferentially spaced horizontal alignment on the body 32 by means of the bolts 37, the horizontal portions 41 of the brackets will lie in a common horizontal plane.
The upper end of the tubular body 32 is provided with'an external annular horizontal flange 44 which in turn is provided at its outer edge with a circular vertical flange 45-. The inner cylindrical surface of the vertical flange is of greater diameter than the external diameter of the manhole cover 12 so that the manhole cover, as illustrated in FIG. 4, may'telescope in the peripheral flange 45 and its outer bottom peripheralsurface may rest on the horizontal annular upwardly facing surface of the flange 44.
The outer ends of the horizontal legs or'portions 41 of the mount brackets 36 are spaced inwardly of the vertical annular surface 49 of the tubular body 16 of the manhole cover holder so that the assembly of the extension 10 and the brackets 36 may be telescoped downwardly into the manhole cover holder until the bottom surfaces of the horizontal flanges 41 engage and rest upon the top surface of the internal flange 26 of the holder.
The tubular body 32 of the extension is also provided with a plurality of sets 51 of apertures 52. Screws 54 may be threaded through a selected one of the holes-52 of each set 51 so that the outwardly protruding shanks of the screws 54 will extend below the flange 26 and engage it to limit upward movement of the extension.
In use, when it is found necessary or desirable to cover the original concrete street or road 23 with a top layer of asphalt 30, the asphalt is layed over the top surface of the top flange 17 of the manhole cover support 16 as illustrated in FIG. 1. The brackets 36 are then rigidly secured to: the tubular body 32 of the extension at such vertical positions thereon as to cause the top edge of the peripheral flange '45 of the extension to be in substantially the same plane as the top surface of the layer of asphalt when the extension 10' istelescoped into the holder 11. It may be necessary at this time to-remove an annu lar portion of the asphalt above the top flange to receive the outer portion of the horizontal support flange 44 and the vertical flange 45.
The screws 54 are then threaded in the apertures 52 and thereafter the extension will be in position to support themanhole cover with its stop surface substantially in the plane of the top surface of the asphalt layer 30.
If desired, the sets 51 of holes 52 may be omitted and thee xtension held in place merely by its weight and also the weight of the manhole cover. Alternatively, retainer screws may be positioned in some of the apertures 34 which are disposed below the internal flange 26 to prevent upward movement of the extension relative to the holder 11.
If desired, the annular space 55 between the flanges 26 and 44 outwardly of the body may also be filled with asphalt or other suitable plastic substance which will set or harden after the extension has been placed in position in the manhole cover support 15.
It will now be seen that it will be apparent that the extension 10, the bolts 37 and brackets 36 are formed of steel of sufficient strength to support the loads imposed on the manhole cover as the wheels of vehicles pass thereover.
It will also be apparent that while the brackets 36 have been shown mounted on the tubular body for supporting the extension on the flange 26 of the usual manhole cover holder, a solid ring may be employed for this purpose.
It will now be seen that a new and improved extension has been illustrated and described which may be positioned at any suitable vertically adjusted position in the usual manhole cover holder or support in order that it may support the manhole cover at a desired higher position as necessitated by the thickness of an additional layer or layers of asphalt which may be added to the original road or street.
The foregoing description of the invention is explanatory only, and changes in the details of the construction illustrated may be made by those skilled in the art, within the scope of the appended claims, without departing from the spirit of the invention.
What is claimed and desired to be secured by Letters Patent l. An extension for a manhole cover holder, the holder having an internal annular upwardly facing support surface on which peripheral portions of a circular manhole cover are adapted to rest to support the top surface of the cover at substantially the plane of the top surface of road, said extension including: a cylindrical body telescopical through a manhole cover holder and having a plurality of sets of circumferentially and vertically spaced apertures; support means securable by means of said apertures of said cylindrical body in vertically adjustable locations thereon by means of connector means extending through selected ones of said apertures of said sets, said support means being engageable with the support means of the holder for holding said tubular body against downward movement in said holder, said body having an external annular horizontal flange at its upper portion providing an annular upwardly facing support surface and a peripheral vertical flange extending upwardly from said horizontal flange, said horizontal flange providing an upwardly facing annular support surface engageable by peripheral portions of the bottom surface of a manhole cover telescopical in said vertical flange for supporting the manhole cover.
2. The extension of claim 1, and retainer means securable to said cylindrical body and extendable outwardly thereof for engaging said holder to limit upward movement of said extension in said holder.
3. The extension of said claim 2, wherein said support means comprises a plurality of angle brackets each having a vertical portion abutting the external surface of said cylindrical body and a bottom horizontal flange extending outwardly therefrom.
4. The extension of claim 3, said connecting means comprising bolts extendable through said apertures and aligned apertures provided said vertical portions of said brackets.
5. The extension of claim 4, wherein said retainer means comprises a plurality of sets of vertically spaced openings provided in said cylindrical body and means extendable through said openings to extend outwardly of said cylindrical body and spaced below said horizontal bottom flanges of said support brackets.
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|U.S. Classification||404/26, 220/3.7|