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Патент USA US2137751

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Nov. 22, 1938.
Filed Jan. 30, 1937
2 Sheets-Sheet l
Nov. 22, 1938“.
Filed Jan. 50, 1957
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2 Sheets-Sheet 2
Patented Nov. 22, 1938
2,137,’! 51
William A. Davis, Malden, Mass., assignor to Bab-t
cock-Davis Corporation, Boston, Mass., a cor
, poration of Massachusetts
Application January 30, 1937, Serial No. 123,224
2 Claims. (Cl. 108-1)
The present invention relates to roof hatches,
and is more particularly concerned with a con
struction of this character which effectually seals
and locks a roof hatchway when not in use, but
5 which may be readily opened and retained in
open position during use.
The purpose and object of the invention is to
provide a complete roof hatch which may be se- _
curely and adequately closed and locked when
10 not in use, but which greatly facilitates removal
of the cover to provide access to the enclosed
With this and other objects in view, various fea
tures of the invention consist in certain novel
features of construction, combinations and ar
rangements of parts hereinafter described and
In the accompanying drawings illustrating the
preferred form of the invention, Fig. 1 represents
20 a section in elevation of the hatch; Fig. 2 is a
detail illustrating a section of the cover support
and hinge; and Fig. 3 is a detail illustrating the
construction of the curbing and the manner in
which the hatch cover may be sealed from the
25 weather.
The illustrated embodiment of the invention
discloses a complete and unitary metal roof hatch
which may be secured upon a roof about the
hatchway opening, and which when so secured
30 forms a complete closed curbing and cover there
for, with provision for ?ashing to cover and pro
tect all exposed joints between the curbing and
As indicated more particularly in the drawings,
the roof is shown generally at It) with the usual
supporting timbers l2 surrounding a hatchway
opening l4. The unitary hatch comprises a curb
ing I6 which corresponds with the size of the
opening, and which has a horizontally extending
40 flange l8 adapted to be secured to the roof by
any desired method of attachment.
Reference to Fig. 2 illustrates the curbing and
securing flange, together with a removable ?ash
ing strip 20, which may be bolted to the curbing
45 at 22, and is provided with an offset portion 24
to form an enclosed space for receiving the upper
a depending flange 36 and a seating strip 38 which
rests upon the rim of the curbing when the cover
is closed, and also serves to seal the interior of
the hatch from the weather.
The cover is nor
mally operated with two compensating hinges
designed for the dual purpose of retaining it in
closed position and facilitating the lifting of the
To this end brackets 40 are secured to
the inside of the curbing, and each bracket carries
a lever 42 pivoted at 44 upon the bracket. The
outer end of the lever 42 is connected through a
link 46 with a bracket 48 secured to the cover.
A second lever 50 is pivoted to the link at 52,
has a pin and slot connection 54 with the bracket
40, and is connected through a second link 56 with 15
the bracket 48 to provide for the opening and
removal of the cover about a movable center and
clear the upper edge of the curbing when thrown
back. Closure and lifting of the cover is facili
tated by a coiled spring 60 extending from the
upper edge of the bracket 40 to a stud 62 con
nected with the lever 42. It will be observed from
an inspection of Fig. 2 that when the cover is
closed the medial line of the spring is at one
side of the pivot 44, and after a slight movement 25
of opening the center line of the spring passes
to the other side of the pivot and tends to facili
tate further opening movement. In closing the
reverse takes place, and the ?nal action is to aid
securing of the cover through the spring.
The cover is maintained in open position by a
locking bar 64 pivoted to the bracket 48 at 56,
and extending at its lower end through a recessed
bracket ‘ill on the side of the curbing. A notch 12
in the locking bar registers with the recess to 35
hold the cover in elevated position.
When the
cover is closed a recessed extension 14 registers
with an opening 16 in the bracket 10 to permit
insertion of a padlock bail or similar instru
mentality, and preclude opening of the hatch
from without.
The present type of hatch has many advantages
over those commonly in use. Due to its unitary
construction it may be simply mounted upon a
roof by securing thereto and ?ashing.
Due to 45
the light weight of the cover and the use of the
portion of ?ashing 26 which extends down along
compensating hinges it may be readily elevated
the sides of the curbing and outwardly over the
roof at 2B. The upper edge of the curbing is pro
vided with a supporting rim 30 of cylindrical
even in the wind without danger of losing the
cover, and without risk of injury. When so ele
vated it may be retained through the lock 50
tubing secured to the curbing at 32, and providing
ing bar in secure open position so long as the
a seat for the reception of the cover.
The hatch is closed by a cover member 34,
hatchway is in use. After closing the hatch is
completely sealed and weatherstripped and locked
preferably made of light metal such as aluminum
The cover member is provided with
against tampering from the outside.
55 or the like.
What is claimed is:
1. A unitary closure for a roof hatch opening
comprising a curbing having a seating rim at the
upper edge, a cover seating upon the curbing rim
and having a depending marginal ?ange, com
pensating hinges permanently connecting the in
side 0! the curbing and the under side of the
cover and each comprising two cperatively in
terconnected rocking lever and link connections
cooperating to elevate and swing the cover about
a movable center in a manner to cause the mar
2. In combination with a roof hatch curbing
and a cover seating upon the upper edge of the
curbing and having a depending marginal ?ange,
separate brackets attached to the inside of the
curbing and the under side of the cover, two sets
of links and levers connected in parallel to both
of said brackets, means for pivotally connecting
the link of one set to the lever oi’ the other set
in a manner to cause said sets to collectively func
tion as a compensating hinge operating to elevate 10
ginal ?ange at the hinged side oi‘ the cover
and swing the cover about a movable center in a
to clear the upper edge oi’ the curbing when the
manner to cause the marginal ?ange at the hinged
side oi’ the cover to clear the upper edge of the
curbing when the cover is thrown back and the
hinged side is swung inwardly, and a spring con
nected to one of said brackets and to the lever of
one of said sets at a point spaced beyond its tul
cover is thrown back and the hinged side is swung
inwardly, a lifting spring connecting the levers
and curbing, the spring being oil'set with respect
to the pivotal point of one lever to provide a toggle
action and facilitate both lifting movements and
?nal seating during closing movement of the
cover, and deformable means for sealing the cover
which is compressed against the seating rim of the
curbing during seating movement oi’ the cover
under the action of the spring.
crum so that the spring will move past said
center with respect to said fulcrum to facilitate
both lifting and closing movement of the cover. 20
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