Year: 1885

page_text: Dearings
I LEWIS GRISCOм of No 110 South Centre Street Pottsville State of Penn-
sylvania United States of America Manufacturer 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 :-
This Invention relates to the construction of journal bearings of various kinds,
in which the brasses are held in place by straps, bolts or similar devices, and the
object of the Invention is to so construct the bearings that the latter will not bind
on the journals when they become heated. This object is attained as fully described
hereafter.
The Invention is especially applicable to the stub ends of connecting rods of
steam and other engines and machines where the bearings are liable to heat and
bind on the crank pins, which in such case constitute the journals.
In the accompanying drawings Figure 1, is a side view, partly in section, of one
form of stub end; Figure 2, is a side view of another form, and Figure 3 is a side
view, partly in section, of a stationary bearing, embodying my invention.
In the construction shown in Figure 1, A is the connecting rod, into the end of
which are screwed or otherwise secured bolts B. B, provided at their outer ends
with nuts b b between which and the end of the rod are confined the two bearing
blocks or half-bearings D. D¹, and retaining cross plate d d.
In the construction shown in Figure 2, the two bearing blocks or half-
bearings D, D¹, are held in place by the strap B¹ which is secured to the end of
the connecting rod by suitable bolts and nuts E, E, and a setting-up wedge F.
The stationary bearing shown in Figure 3, is similar in construction to the stud
and shewn in Figure 1, and being marked with the same letters of reference will
not require further description than the mention that the part marked A¹ represents
some fixed part of a machine or frame.
In the ordinary construction of these stub ends or bearings, the bearing
blocks D, D' are of brass and the confining bolts or straps of iron or steel. When
the crank pin or other journal begins to heat and consequently increase in diameter,
the bearing brasses become heated also, and must necessarily expand, but being
confined by the bolts or strap of iron or steel, which metals have a less ratio of
expansion than the brass, the bearing blocks cannot expand outward by stretching

page_text: the iron or steel straps or bolts, and must therefore, expand inwards. The brasses
thus tend to bind on the crank pin or other journal and increase the difficulty
caused by the heating from lack of oil or other cause; in some cases; resulting in
the direct stoppage of the engine, or other machine.
To remedy this difficulty, I construct the bolts or straps which confine or retain
the bearing blocks, of a metal which has the same ratio of expansion as the bearing
blocks themselves, and a greater rate of expansion under heat than the crank pin,
or other journal, and for this purpose, I make use of phosphor bronze which has
sufficient tensile strength to stand the strain though any other alloy or metal
having the same properties can be used instead of phosphor bronze.
With this construction, when from any cause the crank pin or other journal and
its bearings begin to heat and expand, the heat communicated to the retaining
bolts or straps will cause the latter to expand also, and at a greater rate than the
pin, or journal, thus relieving the bearing just when needed so that when the pin
or journal becomes heated, the engine or machine will continue running and will
give opportunity to the bearings to cool down without stopping.
Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed I declare that what
I claim is
A stub end or other bearing having bearing blocks and provided with confining
bolts or straps of a metal having a greater rate of expansion than the crank pin or
other journal substantially as described.