Improvements in Lubricators.
Year: 1899

page_text: Date of Application, 30th Oct., 1899
Complete Specification Left, 28th July, 1900-Accepted, 1st Sept., 1900
Improvements in Lubricators.
I, GREEVZ FISHER, trading as The Kingfisher Patent Lubrication Company,
Leeds, in the County of York, Oil Merchant, do hereby declare the nature of this
invention to be as follows:-
This invention relates to spring controlled or spring actuated lubricators in
which a stiff lubricant is discharged by the action of a piston operated by a
spring and is designed to reduce the variation of pressure consequent upon direct
acting spiral compression springs.
By this invention I employ springs preferably in tension arranged so that the
pressure produced by them is approximately constant upon the grease in the
cup the springs being attached or connected to levers so placed that when the
spring is exerting its maximum force the leverage will be least and as the force
or tension of the spring is gradually relaxed the leverage will increase.
In carrying out the invention the piston by which the lubricant is discharged
is connected with a double pair of levers pivoted together at their ends.
In its simplest form there are four such levers and four pivots with pivoted
connecting pieces for connecting the levers in position. The connecting pieces
fit into a connecting rod or its equivalent. Two of the pivots are connected or
drawn together by a spiral spring thereby forcing the other two apart. When
the two connecting pieces are brought nearly close together the other two are
at their furthest distance apart and the springs are exerting their greatest force
but as the levers are nearly in a straight line the force of the springs is exerted
to the least effect to force the other ends apart. The connecting pieces may be
separately pivoted to each lever and the other adjacent ends of the levers may
also have separate levers. A single spring may be employed between the levers
if desired.
In a modification the lever or levers may be attached to a flat or laminated
spring or springs one end of such spring or springs being pivoted to the top
connecting piece or a combination of flat and spiral springs may be employed
to draw the top and bottom pieces together.
In another modification two flat or plate springs may be used instead of the
levers such springs being coupled or pivoted together at their ends to a suitable
connecting piece. The forcing together of the end connecting pieces curves the
springs.
It is obvious that the spring or springs and levers may be otherwise placed
or arranged that the levers act at an increasingly advantageous leverage as the
force exerted by the spring decreases.
Dated this 26th day of October 1800
WM. P. THOMPSON & Co.,
6, Bank Street, Manchester, Patent Agents.

page_text: Instead of duplicating the parts of the apparatus a single spring may be
placed in a central position but for practical purposes the apparatus probably
better arranged as shown.
It will thus be seen that the lever or levers act at an increasingly disad-
vantageous leverage as the two central pivots el el are brought together and the
force exerted by the springs is increased and thus a practically uniform
pressure is applied to the piston B. A sufficiently strong spring F may be em-
ployed that a much greater effective pressure may be exerted thereby when in
the position shown in Fig. 2 than when in the position shown in Fig. 5 and this
may be counteracted and a uniform pressure obtained by containing to use the
internal spring D.
Having now particularly described and ascertained the nature of the said in-
vention and in what manner the same is to be performed I declare that what
I claim is:-
1. A lubricator for forcing stiff lubricants constructed with the springs which
actuate the piston attached to levers which act at an increasingly disadvantage-
ous leverage as the force of the spring is increased substantially as described.
2. In a lubricator for stiff lubricants the combination with the lubricator
cup A the piston B of the levers E El pivoted together and the springs F placed
between them substantially as described.
3. A lubricator for stiff lubricants constructed and arranged substantially as
described and shown.
WM. P. THOMPSON & Co.,
Manchester, Liverpool, London & Birmingham, Patent Agents.