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UNITED STATES PATENT OFFICE.
JOHN H. JOHNSON, OF ORANGE, TEXAS.
KILN.
SPECIFICATION forming part of Letters Patent No. 419,334, dated January 14, 1890.
Application filed April 19, 1889. Serial No, 307,722. (No model.)
To. all whon it omay concern: arm GI of a bell-crank lever pivoted inside
Be it known that I, JOHN H. JOHNSON, of of the building A on one of its walls and
Orange, in the county of Orange and State of connected by its other arm G4 with a link
Texas, have invented certain new and useful G, which extends horizontally to the outside 5i
5 Improvements in Kilns, of which the follow- through a suitable slot in one of the walls of
ing is a full, clear, and exact description. the kiln. The outer end of the link G6 is piv-
The invention relates to heat-regulators for otally connected with an arm G6, secured on
dry-kilns; and its object is to provide new a shaft H, extending longitudinally and
and improved means for extinguishing acci- mounted in suitable bearings secured to the 6o
io dental fires occurring within the kilns. outside of the kiln A. On the shaft His also
The invention consists of certain parts and secured an arm H', pivotally connected by a
details and combinations of the same, as will link H2 with a crank-arm HI, fastened on the
be hereinafter described, and then pointed outer end of ashaft H, extending transversely
out in the claims. through the air-inlet pipe C and carrying a 65
15 Reference is to be had to the accompanying damper H5, located inside of the said pipe C.
drawings, forming a part of this specification, When the heat in the kiln A exceeds a normal
in which similar letters of reference indicate degree, then the mercury E in the vessel D is
corresponding parts in all the figures. expanded to such an extent that the piston
Figure 1 is a sectional end elevation of a F in moving up raises the weighted end of 70
20 kiln-building to which my invention is ap- the lever G and causes a downward move-
plied. Fig. 2 is a longitudinal sectional ele- ment of the other end of the lever connected
ovation of the same on the line x x of Fig. 1, with the arm G of the bell-crank lever,which
and Fig. 3 is a side elevation of the improve- is connected by the arms G4 and G and the
ment. link G5 with the shaft H. The latter is con- 75
25 In the drawings I show an automatic heat- sequently turned, so that the arm H' swings
regulating apparatus, which I propose to use downward and causes a turning of the shaft
together with the fire-extinguisher, and for H4 by the link H1 and the crank- arm HI.
which I also propose to file a separate appli- The turning of the shaft H4 closes the damper
cation. I will first .describe such heat-regu- HI in the pipe C, so that the air from the out- 80o
30 lating apparatus, so that its relation to the in- side is prevented from passing into the fur-
vention herein claimed may be understood. nace B. When the heat in the building A
The kiln-building A, of suitable size and con- decreases to the normal degree, then the le-
struction, contains a furnace B of any ap- verG is returned to its former position by
proved construction and provided with an the weight G', and the damper I5 is moved 85
35 air-inlet pipe C, extending to the outside of in an opposite direction to its former position
the building A. Inside of the latter is located by the means above described in connection,
a vessel D, containing mercury or other suit- with the said lever G. The air is then again
able substance easily expanded by heat. In permitted to pass into the furnace B and
the top of the vessel D is held to slide a pis- through the same, tobe heated anddischarged 90
40 ton F, resting at its interior end on the top into the building A. The spring F', on which
of the mercury E in the vessel D, so that the lever G rests, eases the sliding movement
when the mercury expands the piston F is of the piston F.
moved upward. Near the upper end of the I will now describe the fire-extinguishing
piston F is held a spring F', on the top of apparatus. On the outside of the building 95
45 which rests one end of a lever G, fulcrumed A is arranged a weight I, resting on one end
on a suitable bracket secured to the vessel D. of a lever J, fulcrumed on the outside of the
On one end of the lever G is hung a weight building A. The other end of the said lever
G' for holding the piston F in a lowermost J is locked in place by a trigger J', secured on
position-that is, in contact with the top of a shaft J2, mounted to turn in suitable bear- oo
50 the mercury E. The other end of the lever ings in the wall of the buildingA and extend-
G is pivotally connected by a link G with an ing transversely to the inside of the same.
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Johnson, John H. Kiln., patent, January 14, 1890; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth172264/m1/4/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.