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Патент USA US2128968

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Sept. 6, ‘1938..
v ‘
Filed May .4, 1956
6/0»? Sch 0//
Patented Sept. 6, 1938
Clark Scholl, Spring?eld, Ohio, assignor to The
Steel Products Engineering Company, Spring
?eld, Ohio, a corporation of Ohio
Application May 4, 1936, Serial No. 77,771
1 Claim.
The invention relates to solid fuel stokers and
more particularly to hoppers therefor.
Stokers such as those
commonly used in
domestic installations, for example, are ordinarily
5" provided with a hopper adapted to contain a re
serve supply of fuel sufficient to meet the require
ments of the furnace for at least a number of
hours. Coal or other solid fuel is conveyed from
the hopper to the combustion ‘chamber of the
10 furnace by a screw conveyer or other power oper
ated mechanism.
The supply in the hopper is
replenished by hand at more or less regular inter
vals. In the interim period between replenish
ments it is desirable that the hopper be substan
15 tially hermetically sealed. This sealing of the
hopper is desirable not only in order to prevent
coal dust sifting out into the furnace room but
also to prevent gaseous products of combustion
from escaping into the room after leaking from
20 the combustion chamber through the conveyer
mechanism into the hopper.
The principal object of the invention is to pro
vide a hopper for stokers or the like including a
closure mechanism of such character that the
25 hopper may be tightly sealed against the egress
of dust laden air or other gases from the interior
of the hopper, and which is so simple in operation
that even an unskilled operator using the same in
a domestic installation will not be likely to neglect
30 to actuate the closure mechanism to its closed
More speci?cally, it is an object of the inven
tion'to provide a stoker hopper having a hinged
cover and a simple rugged easily manufactured
35 toggle mechanism adapted to lock the cover in its
closed position when the toggle is substantially
collapsed and to maintain the cover ?rmly in its
open position when the toggle is substantially fully
Further objects and advantages of the inven
tion will become apparent as the following de
scriptié'n proceeds and the features of novelty
(Cl. 217-50)
tails of the operating mechanism for the cover
of the hopper.
In the illustrative form shown in the drawing,
the invention is embodied in a hopper ill for a
solid 'fuel stoker particularly designed for do CI
mestic use. The hopper is substantially rec
tangular in form being made of sheet metal and
provided with side, top and bottom walls. Coal
or other solid fuel is moved from the interior of
the hopper it) through a conduit H by a screw 10
conveyer E2 to the combustion chamber (not
shown) of a suitable furnace.
The screw con
veyer I2 is rotated by an electric motor actuated
driving mechanism l3 mounted on the front of
the hopper l0 and having a sheet metal cover 15
M extending thereover.
Fuel is shoveled into the hopper ID in order to
replenish the contents thereof through a rec
tangular opening formed in the front portion of
the top wall of the hopper. This opening is closed
by a substantially rectangular cover or closure
member [5 pivotally supported by hinges Hi. It
will be noted that the portion of the top wall in
which this opening is located slants forwardly so
as to make the same more readily accessible. A
peripheral ?ange l‘l extends about the cover l5
and overlies the adjacent edges of the opening
formed in the hopper ID. A sealing gasket l8
made of rubber or similar resilient material ex
tends entirely about the inner edge portions of the
cover l5 and is ?rmly clamped between adjacent
portions of the cover and the hopper when the
former is in its closed position. As shown in Fig.
3, the gasket l8 preferably includes a hollow bead
portion l9 positioned between the cover I 5 and an
inwardly extending ?ange 20 formed on the
hopper i0 and extending entirely about the open
ing therein. The bead I9 is supported by a flat
integral body portion 2!, which is clamped to the
cover l5 by a clamping strip 22 and screws 23
In accordance with the invention, the cover
i5 is provided with an operating mechanism for
holding the same securely in either its open or
which characterize the invention are pointed out
with particularity in the claim annexed to and . closed positions. In general, this. operating
mechanism preferably includes a toggle linkage
45 forming a part of this speci?cation.
For a better understanding of the invention, which is disposed substantially in its collapsed
position when the cover is closed and substan
referencemay be had to the accompanying draw
tially in its open or fully extended position when
ing in which:
the cover is open. In the particular‘ construc
Figure 1 is a perspective view of a hopper for a
tion. illustrated this toggle linkage includes a .
60 solid fuel stoker embodying the invention.
Fig. 2 is an enlarged side elevation of the upper pair of links 24 and 25 pivotally connected at
portion of the hopper shown in Fig. 1 illustrating their adjacent ends by a pin 26. As shown in
Fig. 1, a similar pair of links 21 and 28 is ar
the cover in its open position.
Fig. 3 is an enlarged fragmentary sectional view ranged on the opposite side of the cover IS, the
adjacent ends of the links 21 and 28 being pivot 55
55 along the line 3—3 in Fig. 1 illustrating the de
ally connected by a pivot pin 29. The other or
free ends of the links 24 and 28 are rigidly se
cured to the opposite ends of shaft 30 which
pivotally connects the same to the hopper III for
movement about an axis substantially parallel
with the pivotal axis of the cover I5. The shaft
30 is journaled in a cylindrical sleeve 3I having
reduced end portions 32 ?tted in registering holes
32a formed in the side walls of the hopper ID.
10 The outer ends of the sleeve 3I are swaged or
otherwise bent over the adjacent edges of the
secured in its closed position with the gasket I8
clamped under compression between the cover
holes 32% in order to provide a tight seal so that
I5 and ?ange 20. Finely divided fuel, gaseous
no dust-laden air or other gases can escape from
products of combustion, or the like are thus
the hopper through these holes.
effectually prevented from escaping out of the
It will thus be seen that in the mechanism
illustrated the toggle links 24 and 21 move
The links 25 and 28 are pivotally connected
to the cover I5 preferably at points closely ad
jacent but laterally displaced from the points of
pivotal connection between the links 25 and 21,
and the hopper I0.
Thus, as best shown in Fig.
1, the toggle linkages formed by the links 24-25
and 2'I—28 are disposed slightly beyond their. col
lapsed positions when the cover I5 is closed.
When in this position the links 24 and 25 abut
against a ?xed stop 33 extending laterally from
the side of the hopper I6 so that the cover I5 is
locked ?rmly in its closed position. with the‘
gasket I8 under compression as shown in Fig. 3.
It will be seen that any pressure applied to the
lower side of the cover 55 tending to raise the
same will tend to move the toggle linkages in a
counterclockwise direction, as viewed in Fig. l.
The stop 33 effectually prevents such movement,
however, so that the hopper cover can only be
released and moved to its open position by a
deliberate manual actuation of the operating
mechanism. At the same time no latches or look
ing bolts are required.
The pivotal connection between the link 25 and
cover I5, in the particular construction shown,
40 includes a cylindrical bearing member 34 secured
to the ?ange I‘! of the cover I5 by a bolt 35. The
bearing member 34 is provided with a shouldered
cylindrical outer bearing portion 36 on which the
end of the link 25 is journaled. A similar pivotal
connection is provided between the upper end of
the link 28 and the cover I5.
Manual operating handles 31 are preferably
provided for moving the cover I5 to its open and
closed positions. The handles 31 illustrated are
mounted on the pivot pins 25 and 29 substan
tially in alinement with the pivotal connection
between the links of the respective toggle mecha
nisms. In opening the cover I5 the handles 3‘!
are used to swing the links 24 and 25 as well as
55 the links 2'! and 28 forwardly about their pivotal
supports. The toggle linkages are thus moved
into their full collapsed positions, this movement
being accompanied by a slight downward move
ment of the cover I5 which is permitted by a fur
ther compression of the gasket I8, and the link
ages are then moved to their full open or extended
positions in which the links are substantially in
A second stop 38, preferably secured to the
65 hopper I0, is so positioned as to prevent further
movement of the linkages slightly after they have
passed their fully extended position. The cover
I5 is thus maintained ?rmly in its open position
as shown in Fig. 2 so that it will not fall and
shovel accidentally strikes the forward and more
exposed sides of the links it will simply force
them more ?rmly against the stop 38 without
having any tendency to close the cover.
In closing the cover I5 the manual operating
handles 3‘! are moved forwardly to swing the
toggle linkages back to a position just beyond
their collapsed or superimposed position, de
scribed above, so that the cover is again ?rmly
njure the operator upon accidental contact there
with during the ?lling of the hopper. If a
through arcs of a little more than 180 degrees
so that the toggle linkages move from a position
a little beyond their full open or extended posi 20
tion to a second or closed position a little beyond
their collapsed position.
The resilience of the
gasket I8 not only serves to form a tight seal
about the edges of the cover I5 but also facili
tates the locking movement of the toggle mecha
nisms so that the cover I5 may be ?rmly locked
in its closed position as described above. It will
also be noted that a minimum number of parts
are utilized in the mechanism described and that
they are not only economical to manufacture 30
but also sufficiently rugged in construction that
they are not likely to be damaged by an un
skilled or inexpert user.
Although a particular embodiment of the in
vention has been illustrated and described in 35
detail there is no intention to thereby limit the
invention to the particular construction illus
trated but on the other hand the appended
claim is intended to cover all modi?cations with
in the spirit and scope of the invention.
I claim as my invention:
The combination with an open hopper adapted
to contain a reserve supply of fuel for a stoker
or the like, of a hinged cover for said hopper,
and a manual operating mechanism for said
cover comprising ?rst and second links located
exteriorly of said hopper pivotally connected to
each other at adjacent ends and respectively to
adjacent points on said hopper and cover at
their other ends, said links being disposed in
superposed position with said points of pivotal
connection substantially in alinement when said
cover is in closed position, the point of pivotal
connection of said second link to said cover be
ing disposed closer to the hinged connection of 55
the cover than is the pivotal connection of said
?rst link to said hopper, a manual operating
handle connected to one of said links for swing
ing them forwardly away from the hinged con
nection ?rst through an over-center or alined
pivot position in opening the cover, then into a
second alined pivot position with said links dis
posed substantially end to end, and ?nally a sub
stantial distance past said second alined pivot
position, and a ?xed abutment contacting one of
said links in its ?nal position to prevent further
movement thereof, whereby said cover is locked
in both its open and closed positions by the over
center movement of the linkage.
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