US1898871A - Manhole cover - Google Patents

Description

MANHOLE COVER Filed April 7, 1950 2 Sheets-Sheet l gg z.

A llomey Feb. 21, 1933. H ELLIS 1,898,871

MANHOLE COVER Filed April 7, 1930 2 Sheets-Sheet 2 A llorney 59 character and adapted for disposition in Patented Feb. 21, 1933 warren sTArss PArrnr orrice HENRY CHARLWOOD ELLIS, OF MEMPHIS, TENNESSEE, ASSIGNOR TO WM. C. ELLIS 85 SONS IRON WORKS, OF MEMPHIS, TENNESSEE -MANHOLE covert Application filed April 7,

Thisinvention relates to certain new and novel improvements in man hole covers, and the primary objectof this invention is to provide a man hole cover equipped with suitable means for retaining the cover securely in position.

Briefly the invention consists of an annular ring supported in the upper end of the man hole which ring is provided internally with a plurality of pockets together with a cover provided inwardly from its periphery with a plurality of lugs, there being one lug for each pocket and conformably fitting within the pocket for wedged engagement within the pocket upon rotation of the man hole in one direction for securing the cover in position on the annulus.

A still further object of the invention is to provide a man hole cover of the character above mentioned which is comparatively simple in construction, strong, durable, thoroughly reliable, practical, and efiicient in operation, inexpensive and well adapted for the purpose desired.

Other objects and advantages of the invention will become apparent during a study of the following description, taken in connection with the accompanying drawings wherein:

Figure l is a top plan view of the man hole cover showing the cover in closed position,

Figure 2 is a vertical transverse view therethrough,

Figure 3 is a fragmentary detail elevational view looking within the annulus for clearly illustrating one of the pockets,

Figure 4 is a top plan view of theannulus with the cover removed,

Figure 5 is a fragmentary detail view in section illustrative of a modified form of locking means for the cover,

Figure 6 is a fragmentary detail elevational view of the cover illustrative of the locking lugs carried thereby.

With reference more in detail to the drawings, it will be seen the invention comprehends the provision of an annular frame or ring designated generally by the reference 1930. Serial No. 442,423.

the mouth of a man hole. The ring at its upper portion is provided with an internal annular shoulder 6.

The cover per se is in the nature of a disk and is designated generally by the reference character 7. The cover is provided with a skirt 8 depending therefrom inwardly from the periphery thereof and when fitted and locked within the ring or annular frame 5 the peripheral edge of the cover rests on the shoulder 6 as shown to advantage in Figure 3.

Reference being had to Figures 3 and 1, it will be seen that the annular frame 5 internally is provided with a plurality of circumferentially spaced inwardly extending lugs 9. I Cooperating with each of the lugs 9 is a relatively smaller lug 10. The smaller lug 10 is disposed forwardly of the forward end of the lug 9 and said smaller lug 10 has one end thereof disposed above and in overlapping relation with the forward end of the lug 9, said lugs 9 and 10 cooperating to provide a pocket designated generally by the reference character 11.

In this instance, it will be noted that the relatively larger lug 9' on the upper face thereof is provided with a downwardly inclined bearing surface 12 merging at its lower forward end into a substantially horizontal bearing surface 13. The lug 10 at its rearwardmost end and at the lower corner thereof is formed to provide a bearing surface 14 disposed substantially oblique to the horizontal bearing surface 13. For reception within the pocket 11, the cover 7 011 the outer peripheral face of the skirt 8'is provided with a lug 15 as detailed in Figure 6. The lug 15 has an inclined bearing surface or face 16 inclining forwardly and at the forward end of the lug merg- 'ing into a horizontally disposed bearing surface 17 The lug 15 at said forward end is suitably cut away to form a tongue 18, the bottom face of which forms the bearing surface 17 while the upper face of the tongue 18 is inclined downwardly and forwardly to provide a bearing surface or face 19.

The positioning of the cover 7 in closing position is accomplished by rotating the face corresponding to the inclined bearing cover in a proper direction so that the surfaces of the upper lugs on said annular tongues 18 of the lugs 15 enter the pockets frame.

11 to move downwardly and forwardly in the ockets so that obviously the surfaces 16 oi tie lugs 15 will move over the surfaces 12 of the lugs 9 and the tongues 18 will be received in the spaces between the overlaping ends of the lugs 9 and 10 with the suraces 19 of the tongues 18 bearing against In testimony whereof I afiix my signature.

HENRY CHARLVVOOD ELLIS.

the surfaces 13 of the lugs 10 and the hori-' V zontally disposed surfaces 17 of thelugs 18 bearing against the horizontally disposed surfaces 13 of the lugs 9, thetongues 18v wedgin themselves in the spaces between the sur aces 13 and 14 as is apparent'thus securely locking the cover in place.

In that embodiment of the invention shown in Figure 5, it will be apparent that the edge outlines of the lugs 9 10, and 15 will be substantially the same except that the bearing surface of the In 9' which corresponds to the bearing sur ace 12 of said lug 9 is herein designated by the reference character 12', and in this instance the surface 12 is increased to carry the weight'of the cover so that the body of the cover 7 has its under face disposed in spaced relation to the top face of the lug 10 thus it will be apparent that the lug 9 in this instance is utilized for supporting the entire weight of the cover 7 and is not aided in the support of the cover 7 by the shoulder 6 as in that embodimentof the invention shown in Figure 3 and hereinbefore described in detai 7 It is thought that from the foregoing description, taken in connection with the accom anying drawings a clear understandin of t e operation, construction, utility and advantages of an invention of this character will be had by those skilled in this art without a more detail description.

Having thus described my invention, what I claim as new is:

In a manhole cover, an annular frame member provided internally with a circular series of relatively spaced pairs of lugs, each pair of lugs including an upper lug and a lower lug, the lower lug having an inclined upper bearing surface merging into a horizontal bearing surface, and the upper lug having an end thereof provided with an inclined bearing surface, and also having said end disposed in overlapping relation with the forward end of the lower lug; and a cover plate supported on said annular frame and provided with a circular series of spaced lugs each of which has inclined and horizontal bearing surfaces corresponding to the inclined and horizontal bearing surfaces of the aforementioned lower lugs on said annular frame, each lug on said cover also having at its free end an inclined bearing sur-

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