Improvements in Manhole Frames and Covers.
Year: 1899

page_text: Date of Application, 31st Oct., 1899-Accepted, 2nd Dec.,
1899
Improvements in Manhole Frames and Covers.
I, THOMAS PENNINGTON GREGER, a Citizen of the United States, residing at
North Wales, in the County of Montgomery and State of Pennsylvania, Electrical
Engineor, do hereby declare the nature of this invention and in what manner the
same is to be performed to be particularly described and ascertained in and by
the following statement;―
My invention has relation to a manhole frame and cover, and in such con-
nection it relates to the construction and anangement of the fame and cover
The pincipal object of my invention is to provide a manhole frame and cover
of simple construction, the frame and cover being so constructed and anlanged
as to admit of the change from a non-ventilating to a ventilating frame and covei
or rice versu
My invention stated in general terms, consists of a manhole cover and frame
constructed and arranged in substantially the manner hereinafter described and
claimed
The nature and scope of my invention will be more fully understood from the
following description taken in connection with the accompanying diawings, form-
ing part hereof, in which
Figure 1, is a top or plan view of a frame and cover partially broken away
and embodying main features of my invention, and the cover being seated in the
frame so as to form a non-ventilating frame and cover
Fig 2, 18 a vertical sectional view on the line x-x, of Fig 1
Fig 3, 18 a similar view to that of Fig 1, but with the cover shifted on its
seat to form with the flame a ventilating cover and frame for the manhole; and
Fig. 4, is a vertical sectional view on the line y-y, of Fig 3.
Referring to the drawings a, represents the base of the fiame from which pro-
jects the upwardly extending wall b, having in its interior the flange d, formung
the seat for the cover e, and extending under the base of said cover The flange d,
18 cut out at regular points, to form semicucular and vertical recesses or open-
ings in the seat or flange d The periphery or rim of the cover e, is also cut out
so as to form oppositely auanged semicircular recesses e, so that when requned
the cover, may rest on the seat or flange d, with the recesses or openings e¹,
registering with the recesses or openings d, of the scat d, as illustrated in Figs 3
and 4 When, however, the cover is shifted slightly on its seat, the openings e¹,
of the cover may be shifted to come opposite the uncut portions of the flange or
seat d, the cut-out portions ¹, of said flange or seat d, at the same time resting
beneath the uncut portions of the rim of the cover e The recesses e¹, extend
obliquely along the rim of the cover. To lock the cover in the fiame and to
prevent its accidental displacement on the seat d, as well as to serve as a guide
in the turning of the cover on its seat, the inner periphery of the wall b, is cut
but or notched as at 61, 6, in the upper edge or iim of the said wall, and into
one of these notches a lug or projection e, on the 11m of the cover is adapted
to engage
Thus, as illustrated in Figs. 1 and 2, the projection e, fits into the
notch b², and locks the cover so that the openings de, are closed while in Figs. 3

page_text: and 4, the lug or projection e³, fits into the notch 63, and locks the cover so that
the openings and e¹, register The cover may be provided with hand lifts or
1ings f, or other somewhat similar devices, whereby it may be readily and quickly
removed from the frame for the purpose of adjustment or otherwise. The cutting
out of the 11m of the coverre, into semicircular recesses e¹, oppositely curved with
respect to the recesses of the ledge d, ensures the complete cover-
ing of the base of said recesses e, by the uncut portions of said
ledge, which portions corespond in shape, but are larger than the
recesses cl The construction and arrangement above described permits of the
cutting out of both the 1m of the cover as well as the ledge d, without impairing
the strength of either the ledge or the cover.
Having now particularly described and ascertained the nature and objects of my
invention and in what manner the same is to be performed, I declare that what
I claim 18.
1 The combination with a frame having an upwardly projecting wall, an
annular flange oi ledge formed on the interior of said wall, said ledge being pio-
vided with alternate recesses and projections, of a cover, the base whereof is
adapted to rest upon the flange or ledge and having its rim provided at intervals
with recesses reversely arranged to the recesses in said ledge, said cover adapted
to be supported on said ledge so that its recesses may register alternately with the
recesses or projections of the ledge, substantially as and for the purposes described
2 The combination of a frame having an upwardly projecting wall, an annular
flange or ledge formed on the interior of said wall, said ledge being piovided with
alternate recesses and projections, a cover, the base of which is adapted to rest
on said ledge and having its rim provided with recesses reveisely alianged with
respect to the recesses of the ledge, and means for locking the cover within the
fiame to prevent the turning of the cover on said ledge, substantially as and for
the purposes described.
Dated at Dhiladalbin Dow
1000
ylvania, this hath day of Octobe AD 1899.
THOMAS PENNINGTON GREGER,
Per J. G. Loriain, NICE., MI.Mech E,
Chartered Patent Agent