Improvements in or relating to discharge apparatus for fluids and semi-fluid substances
518,184. Discharge apparatus for lubricant &c. TRIER BROS., Ltd., and CROTHERS, P. F. Aug. 17, 1938, No. 24227. [Classes 102 (i) and 102 (ii)] [Also in Group XX] In discharge apparatus for lubricant or other fluid, semi-fluid or plastic substance, comprising a floating piston B' which divides a cylinder B into a chamber B<2> filled with the lubricant and a chamber B<3> supplied with oil or other liquid under pressure and at a rate determined by the desired delivery, the pressure liquid is delivered by a pump E operated by power-driven mechanism whilst manually operated mechanism is provided for operating a pump whereby pressure liquid can be withdrawn from the chamber B<3> at a rate considerably in excess of that at which the power operated pump delivers it. The power operated pump may be stopped, or may continue to operate, during operation of the manually operated pump The chamber B<2> is connected to inlet and delivery pipes C<6>, C<2> by means of manually operated valves or non-return valves C', C', and it may be replenished automatically, or by 'hand. The cylinder head may carry a projection C' for limiting the upward stroke of the piston B'. The pump E comprises a box E<1> with an inlet port E<4> associated with a filter E<5> in the sump A<1> and with a delivery port having a non-return valve D' leading to a delivery passage D for the chamber B<3>. The bore E<1> contains a pump piston E<2> reciprocated by a lever F or by a cam or eccentric, and also a dummy piston E<3> operated by a member G against a spring G to vary the quantity of liquid delivered at each stroke of the piston E<2>, The delivery passage D communicates with a relief valve D<3> and a pressure gauge D<4>. The lever F is mounted on a shaft F<2> having a part K with a spigot K' on which freely rocks an arm K<2> and a plate L secured to a second plate L', the latter having arcuate slots L' to receive adjustable stops L<4> with which the arm K<2> co-operates. The arm K<2> is connected by an adjustable link K<3> to power operated mechanism for oscillating it, and the plate L may be disconnected from the part K by withdrawing a spring-pressed bolt K<4> by means of a handle K<5>. The shaft F' may then be rocked by hand through a socket K<7>, lugs K' and stops K<9> preventing excess reciprocation. The sump A<1> has a cap M' for a filling aperture and it may be fitted with an oil level gauge M. The manually operated pump comprises a bore H' connected by a suction passage H to chamber B' and containing a pump plunger H' and a spring controlled dummy piston H<5> normally covering an outlet port H' leading to the sump A<1>. The plunger H<2> is operated by a lever H<3>, a link H<4>, and a socket receiving a handle H<9>. For replenishing purposes the chamber B<2> may be fitted with an adapter N carrying packing N<2> and normally closed by a spring-pressed cover 0 which can be withdrawn for the insertion of a tin P containing lubricant and a piston formed by a metal disc P<1> with a central aperture P'. The pressure liquid may be drawn through a sight glass comprising a tubular body Q, Fig. 6, a glass tube Q', one or more slots Q<2>, a wire R between inlet and outlet passage Q<7>, Q' and a hollow-stemmed valve S<2> controlled by a spring S<3> and provided with radial ports S' leading into a chamber S.