US199737A - Improvement in rotary pumps - Google Patents

Description

'A'. NOTEMAN. Rotary-Pumps.

Patented lain. 29,1878.

FIG

FIGS.

N- PETERS, FHOTO-LITHOGRAFHER WASHINGTON. D. C,

UNITED STATES PATENT OFFICE.

ALONZQ NOTEMAN,

or TO LEDO, O HIO.

IMPROVEMENT m ROTARY PUMPS.

Specification forming part of Letters Patent No. 199,737, dated January29, 1878 application filed April 28, 1877. p 7

To all whomct may concerm' Be it known that ,I, ALONZO NOTEMAN, of the city of Toledo, in the county of Lucas and State of Ohio, have invented a new and useful Improvement in Rotary Pumps, which provement is fully set forth in the following specification My invention relates, to improvements inrotary pumps, the nature of which will be fully explained by reference to the accompanying drawings, in which- Figure l is a side view, with the end plate of the casing removed. Fig. 2 is a vertical section. Fig. 3 is one of the guide-plates, with the position of the pistons in section shown, and Fig. 4 is one of the pistons.

Av is the casing, within which are placed -the operating parts of my. device. B is'the abutment. O is thepiston-head, divided by cross-channels G O, placed at right angles to the axis of the piston-head, the whole being se cured firmly together by suitable bolts or screws, as shown. a

The abutment B is made semicircular in form, and so that it fills about one-third of the inner space or chamber of the casing. Its ends or points B are made to extend past the vertical diameter, as shown in Fig. 1, thus occupying more than half the inner circumference of the casing, by which construction the curved or cam surfaces B engage and move the piston,

and open the discharge-port before thewater between the engaged piston and that immediately following shall have made a half revolution of the casing, thus relieving the friction and creating a vacuum, and discharging the water at a much earlier period than is accomplished in ordinary devices of this class. The abutmentB covers, and has formedthrough its ends water-passages communicating with Fig. 1.

B? is a semicircular recess, formed in the face I of the abutment B. It extends between the inner or adjacent sides a a of the ports A A and it is adapted to fit snugly over and cover nearly one-half of the circumference of the piston-head O.

The piston-head O has vformedthrough its center, and at right angles to each other, the vertical channels O 0 ,111 which the sliding pistons E E are placed. It is rigidly secured to the head or guide plates D D, which, for greater firmness, are recessed, as shown at D, Fig. 3; and it is journaled centrally in the casing, with one side fitting snugly into the recess B The head-plates D D are provided with suitable journals, which are seated in bearings in the outer plates A A one of the journals being extended so as to.provide a shaft for making connections with other machinery. They are made a little larger in diameter thanthe diameter of the inner circumference of the part A and have their rims packed in a rabbet or head-plates D be not recessed for the reception of the end of the piston-head, as hereinbefore described, the channels Dtwill extend entirely across the plates 5 but otherwise, they will extend only from the circumference to the recess D The latter, being formed the same depth as the former, makes the channel substantially entirely across.

E E are the pistons, made in the form shown, and, divided into the two equal parts E E, each part being composed of the horizontal and vertical wings E E The valves, being divided in the middle,rwill be extended or. contracted, as required, to preserve a perfect packing against the walls of the casing and the abutment B. In the cross-movement of the valves the sharp corners of the contiguthe ports A A, as indicated in dotted lines, 7

. suitable holes a in the horizontal wings E which preserves the bearing-edges of the wings in the same line, andtat the same timepermits a free to-and-fro movement thereon of one or both of the halves. In one of the holes '6 I place a spring, 6 which, acting on the free end of the pin 6, will force the wing or half E outward, and pack the piston firmly against the walls of the casing and abutment. By the foregoing it will be seen that I am enabled to employ two pistons, crossing each other, with capability of extension, and sliding in crosschannels formed through the piston-head G, thereby giving me all the advantages of a piston made solid or in one piece, and of a piston made with capability of extension.

When the head-plates D are placed in position, with their rims properly packed-in the rabbet or groove 01, as hereinbefore explained, and the end plates A A are bolted on, as shown in Fig. 2, it will be seen that there is made a water and air tight chamber within the casing, the only openings being the ports A A thereby providing a perfect vacuumchamber for the action of the pistons.

' It will be further seen that the valves E are in the channels D with capability of a free and steady to-and-fro movement, and that the great amount of friction consequent from the extended surfaces of the sides of the pistons bearing against the sides of the channels 0 is obviated, and the pistons are not so liable to become worn and inefficient by long-continued use.

By inspecting Fig. 1 it will be seen that any given piston is never packed between the walls of the cylinder A but is always packed between the wall of said cylinder and the face of the abutment B, or between the cam-surfaces B It will be further seen, when one of the pistons is brought across, so that it will receive the full force of the water flowing in through the suction-port A, that less than a half-revolution of said piston will bring it round to and partially open the discharge port A which partial opening will relieve the friction of the water, which has by this time expended. its force behind the piston.

By'reason of the great amount'of friction obviated by the construction of my device, I am enabled to furnish a pump which can be operated with a much slower movement than, and with improved results over, the ordinary rotary pump. 1

The pistons are moved by the positive ac-' tion of the cam-surfaces, no reliance being placed on gravity as amoving force. The pistons are kept constantly packed, so that all noise and clatter are avoided. Between the suction-port and discharge-port two pistons are always closely packed with a vacuum in front of the forward one. The piston being moved by the cam-surfaces into position, no friction, except that caused by the packingspring a is made on the face of the recess B, so that the abutment within this recess does not become worn so as to form an unprotected passage over the piston-head, through which air could pass from the discharge-pipe back to the piston at the suction-pipe.

The end of the abutment may be hardened by any well-known process, so as to prevent wear of the cam-surfaces B Or these ends may be formed separate from and closely fitted to the abutment by any suitable means whereby they could be removed when worn, and replaced by others.

I do not claim, broadly, the construction of a casing with an abutment against which the piston-head revolves; nor do I claim, broadly, the construction of pistons adapted to move across each other in channels in the pistonhead, as such constructions are old and well known; but

Having described my invention, what I claim, and desire to secure by Letters Patent, 1s-

1. The semicircular abutment B, constructed with the recess B and cam-surfaces B and having its ends or points B extended past the central line or'diameter of the cylinder A and having through it water-passages communieating with the ports A A and the inner chamber of the casing, in combination with the piston-head O and pistons E, substantially as set forth.

2. In a rotary pump, the head-platesD, constructed with the guide-channels D in combination with the piston-head O and pistons E, for the purpose set forth.

In a rotary pump, the pistons E E, constructed as described, and divided into the equal parts E E and held in line by the pin e in holes 6 and provided with the springs 0 and placed so as to move at right angles across each other, in combination with the pistonhead 0, having channels 0 0 formed at right angles to each other, and head-plates D, constructed with channels D substantially as set forth.

4. A rotary-pump casing, A, constructed ALONZO NOTEMAN.

Witnesses:

E. H. RHOADES, W. T. RYAN.

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