US1163189A - Manhole and cover for the same. - Google Patents

Description

J. S. WOLF.

MANHOLE ANDCOVEH FOR THE SAME.

APPLIcAloN FILED DEQ. x9` 1914.

1,163,189. Patented 11%.?,1915

Witnesse: Invefetanlike.

Jenn s. WOLF, or Yoivirnias, NEW YORK.

IVIANHOLE AND` COVER FOB, THE SAME.

Specification of Letters Patent.

i p Patented Dec. 7, 1915.

Application led December 19, 1914. Serial No. 878,025.

To all whom it may concern.'

Be it known that 1, .loi-IN S. WOLF, a citizen of the United States, residing in Yonkers, in the county of lVestchester and State of New York, have invented certain new and useful Improvements inManholes and Covers for the Same, of which the following is a specification.

This invention relates to manholes and covers for the same.

lith the form of manhole covers heretofore in use, vthe formation of thick layers of ice onthey inner covers during the winter in thev more severe climates, has greatly hampered the removal or opening of these covers, the removal of which covers in some `cases was entirely impossible without destroyingthe cover to a material extent.

The main object of this invention is to provide such a construction of inner and outer covers which cooperate with one another to prevent the formation of thick layers of ice on the inner cover in cold weather, at least to preserve the opening means for the cover unencumbered from foreign materialsuch as ice, dust, dirt, earth or the To this end, an arrangement is provided for forming air chambers which will prevent the admission of water to the upper' surface of theinner cover, or at least to prevent such a level of water forming upon the upper surface of the inner cover as 'would yinterfere with the closing means of the inner cover. 1

Another object of the invention is to provide an inner cover arrangement having a locking bar secured onthe inside of the inner cover.

These and other features, capabilities and advantages of the Yinvention will appear from the subjoined detailed description of one specilic embodiment thereof illustrated vin the accompanying drawings in which- Figure 1 is a transverse section of the manhole with the inner and outer coversin closed position. Fig. 2 isa plan view of the same with the outer cover removed and drawn on a slightly smaller scale than Fig. 1.l Fig. 3 is a perspective view of the outer cover showing the lower surface thereof. Fig. Llis a fragmental detail showing one of tlieilocking recessesl for the lockingbar of theinner plate. Fig. 5 is aA fragmental diagrammatic view showing the formation `form a tight joint at such place.

of the air chamber producedfor preserving thelocking portions of the inner cover from ice and the like.

1n the embodiment shown, there is provided a frame 1 having a base 2, a circular y3, there is fcrmedan annular bead 5 which projects beyond the lower face of the base 2. The inside of the wall 3 is provided with an annular inwardly extending offset portion 6 which is provided at its upper end withan annular inwardly extending bead 7. At the upperend of the inside of the wall 3 there is formed an annular recess or rabbet 30;

In the offsetportion 6, there are formed tworecesses r8, 8 one located diametrically opposite the other, each (see Fig. 4) having a rvertical channel9 beginning at the lower end of the oifset portion 6 and a horizontal Achannel 10 in communication with such vertical channelQ. Into these recesses 8 the opposite ends 13, 13 of the locking bar 11 are positioned forlocking the inner cover 12 in place which end portions 13-are preferably comparatively thin and adapted to beguided into'tlie-recesses S. jFrom the end portion 13, ther bar 11 enlarges toward its central portion where it is provided with anopening 14: internally screw-threaded.

The inner or close fitting cover 12 is saucer-shaped having an upwardly facing concave surface 15, an annular bead 16 onv thelower surface of such cover 12 spaced a the upper edge of the olfset portiony 6 to t a The cover 12 is provided with an opening-19 at its center having a recedingshoulder 20 around its upper end to accommodate the head21- of a` locking screw 22 which passes through the opening 19 and then screws into the opening 141 in the locking bar 11 by means of which the inner plate12 is locked in position. The

screw 22 is provided on its head k21 with a v lug 23 having a large orifice 24 thereinfor the insertion of ay tool for turning saidy screw, and also having small orifices 25. Alongside of' thefopening 19 on the upper face 15 of the cover 12 there is providedy a lug 26 having a small orifice 27 which is adapted to have a wire pass through it and through one of the orifices 25 of the lug 23 which may be adjacent to it, to which wire a seal may be secured. The upper surface 15 of the cover 12 Fig. `2 nearer its outer periphery is provided with ears 28 to serve as engaging means for a tool used for removing said cover 12. rlhere is also provided in the upper surface 15 of the cover 12 an annular rim 29 concentric with the opening 19 and substantially disposed medially between the outer periphery of such cover 12 and its center.

Resting on the annular rabbet 30 there is positioned the outer or protective .cover 31 whose upper surface may be ribbed as shown, and whose inner surface is provided with two annular rims, an outer rim 32 'of comparatively low altitude and an inner rim 33 of high altitude, both rims substantially concentric with the center of the cover 31, the inner rim 33 having outwardly extending ribs 3/1 for the purpose of reinforcement as shown in Fig. 3. Vhen the outer cover is placed in closing position the inner rim 33 will be disposed inside of the rim 29 of the inner cover 12. Thus in the use of the device,-should water creep in under the outer cover 31 this would first be prevented by the vrim 29, acting as a baffle, from approaching the locking screw 22 and should cold weather have set in, then as shown in Fig. 5, the water would not be permitted to rise above the level in which the lower edge of the rim 32 is disposed which level is below the level in which the upper edge of the rim 29 is disposed at which level the water might freeze and since no more water could flow rims 2 9 and 32, the' locking means would be kept free to be manipulated. However, should this first protective cover be in any kway impaired and the water be permitted to flow beyond the rim 32, then a like air cushion would be formed above the water collected inside of the rim 33 as soon as the level of the water rosevabove the level of the lower edge of the rim 33 and thus if any water did flow around the locking screw 22 only a comparatively thin layer of ice would there be formed. v

Itis obvious that various changes and modifications may be made in thev details of construction without departing from the general spirit of the invention.

I claim:

1. In combination with a manhole having a frame, a cover for said manhole, a locking bar'for locking said cover in place and disposed on the inner side of said cover, locking means for locking said cover to said locking bar, and a water-seal air-chamber forming means for prohibiting the collection of a high level of water around said locking means.

2. In combination with a manhole having a frame, an inner close fitting cover disposed in said frame, an outer protective cover disposed on said frame above said inner cover, locking means for locking said inner cover in position and disposed centrally of said inner cover, said inner cover having a concave upper surface, and an annular rim of high altitude disposed on the lower surface of said outer cover and surrounding said loclring means, said annular rim cooperating with the concave surface of said inner cover to form an air chamber to prevent the collection of a high level of water above said locking means.

3. In combination with a manhole having a frame, an inner close fitting cover disposed in said frame, an outer protective cover disposed on said frame above said inner cover, locking means for locking said inner cover in position and disposed centrally of said inner cover, said inner cover having a concave uppersurface, and an annular rim on the lower surface of said outer cover and extending into close proximity to the upper surface of said inner cover and surrounding said locking means, said annular rim cooperating with the concave surface ofrsaid inner cover to form an air chamber for preventing the collection of a high level of water above said locking means.

4. In combination with a manhole having a frame, an inner close fitting cover disposed in said frame, an outer protective cover disposed on said frame above said inner cover, locking means for locking said inner cover in position and disposedcentrally of said innerl cover, the upper surface of said inner cover being concave to coperate with Said protective cover ultimately to prevent the collection of a high level of water around said locking means, and an annular rim disposed on the upper surface of said inner cover to serve as a baffle initially to prevent the collection of water around said locking means.

5. In combination with a manhole having a frame, an inner close fitting cover disposed in said frame, an outer protective cover disposed on said frame above said inner cover, and locking means for locking said inner cover in position and disposed centrally of said inner cover, thel upper surface of said inner cover being concave to cooperate with said protective cover ultimately to prevent the collection of a high level of water around said locking means.

6. In combination with a manhole having a frame, an inner close fitting cover disposed in said frame, an outer protective cover disposed on said frame above. said inner cover, locking means for locking said inner cover in position and disposed centrally of said inner cover, said inner cover having a concave upper surface, an annular rim disposed on the upper surface of said inner cover surrounding said locking means to initially prevent the collection of water around said locking means, and a second annular rim on the lower surface of the outer cover outside of the rim on said inner cover, which two rims cooperate with the concave surface of said inner cover to form an air chamber to ultimately prevent the collection of a high level of water around said locking means.

7. In combination with a manhole having a frame, an inner close fitting cover disposed in said frame, an outer protective cover disposed on said frame above said inner cove-r, locking means for locking said inner cover in position and disposed centrally 'of said inner cover, said inner cover having a concave upper surface, a high annular rim disposed on the lower surface of said outer cover surrounding said locking means, and coperating with the concave surface of said inner cover to form an air chamber whereby to prevent the collection of a high level of water above said locking means, a low annular rim on the lower surface of the outer cover outside of said high annular rim, and an annular rim yon the upper surface of said inner cover and disposed between the two annular rims on said outer cover, the annular rim on said inner cover and the low annular rim on said outer cover cooperating with the concave upper JOHN S. WOLF.

Vitnesses:

GUs'rAv DRnWs, H. D. PENNEY.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

i Washington, D. C.

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