US1019074A - End-play device. - Google Patents

Description

R. C. NEWHOUSE.

END PLAY DEVICE.

APPLIOATION IILED OCT. 20, 1911.

1,019,074, Patehted Mar.5, 1912.

WITNESEES- INVENTEI' Q I A TT :1 R N EY UNTTED STATES PATENT OFFICE.

RAY C. NEWHOUSE, OF MILWAUKEE, WISCONSIN, ASSIGNOR TO ALLIS-CHALMERS COMPANY, OF MILWAUKEE, WISCONSIN, A CORPORATION OF NEW JERSEY.

END-PLAY DEVICE. 7'

Specification of Letters Patent.

Application filed October 20, 1911.

Patented Mar. 5, 1912.

Serial No. 655,717.

To all whom it may concern:

Be it known that I, RAY G. NnwHoUsE, a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of WVisconsin, have invented a'certain new and useful Improvement in End-Play Devices, of which the following is a specification.

This invention relates to improvements in the construction of end play devices for imparting longitudinal or end motion to rotating shafts.

The object of the invention is to provide an'end play device for rotating shafts, which is simple in construction, automatic in its operation and will give'a very slow axial reciprocation to the shaft in addition to its rotary motion.

The device is adapted to be applied to the shafts of any apparatus in which end motion of the shaft is required, but is particularly adapted to be used on the shafts of crushing rolls wherein a very slow reciprocation of one of the rolls is desired.

A. clear conception of an embodiment of the invention can be had by referring to the drawing accompanying and forming part of this specification.

The figure of the drawing represents a central vertical section through an end play device, showing same applied to a fragment of a shaft and shaft bearing.

The shaft 1, which may be the shaft of a crushing roll, dynamo or similar apparatus, is mounted to rotate within the stationary frame 10, being retained in position by a bearing cap 2. The piston rod 7 is fixed to the end of the shaft 1 concentric therewith, and carries a piston 14 at its outer free end. The piston 14: is also concentric with the rod 7 and shaft 1, being secured to the rod 7 and adapted to rotate with the shaft 1. The piston let need not, however, be rigidly connected to the rod 7 and adapted for rotation with the shaft 1.

The cylinder 13 in which the piston 1 1 is adapted to reciprocate, has its ends inclosed by means of suitable cylinder heads one of which carries a stuffing box 15 surrounding the rod 7. The cylinder 13 is mounted upon a base portion which is rigidly connected with the frame 10. Ports 17 connect the piston chamber 16 with a small piston valve chamber 19 formed in the base of the cylinder 13. Ports 18 connect the piston chamber 16 with the large piston valve chamber 28. The piston valve chambers 19, 28, are directly connected by a large central port formed in the base of the cylinder 13. The small piston valve 22 closely fits the walls of the chamber 19 and is adapted to reciprocate within this chamber 19. The large piston valve 27 closely fits the walls of the chamber 28 and is adapted to reciprocate within this chamber 28. The lever 21 has a central pivot 24 by which it is mounted to swing relative to the stationary base of the cylinder 13. The upperend of the lever 21 is forked and extends upwardly between the enlarged end portions of the small piston valve 22. The lower end of the lever 21 is also forked and extendsdownwardly between the enlarged end portions of the large piston valve 27. The tension spring 25 has its upper end 26 fastened to the lever 21 at a point above the pivot 24, while the lower end of the spring 25 is secured to the stationary base by a pin 23 below the pivot 24, thus forming a toggle.

Ports 20 passing through the base of the cylinder 13 form drains for the chamber 19. Ports 30 formed in the inclosing heads of the chamber 28, likewise form drains for the ends of this chamber. The chamber 28 is connected by means of ports and passages formed in the stationary base, with the pipe 12 leading to the discharge chamber of a pump 9. The mid-portion of the chamber 28 is connected by means of a passage formed in the stationary base with the pipe 31 leading to the fluid supply reservoir 32. The large piston valve 27 is provided with annular recesses adjacent the ends thereof and with cut-away portions 29 near its midportion, the valve being locked against rotation by a small radial pin which coacts ina groove in the casing.

The pump 9, which may be of any of the well known positive displacement types, is mounted on the frame 10, and has a suction pipe 11 leading from the supply tank 32 and a discharge pipe 12 leading to the cylinder 13. The pump piston 8 is connected by means of a rod 6 to the eccentric 4 which is slidable axially of the piston rod 7 but is positively rotated by the rod 7 through a spline 5. The eccentric 4 is prevented from moving longitudinally of the frame 10 and cylinder 13 by means of a guide member 3 fixed to the frame.

During the normal operation of the device, the shaft 1 is rotated at a high rate of speed, carrying with it the piston rod 7 and piston 14 attached thereto. The eccentric 4 carried by the rod 7 is also rotated through the spline 5, causing the pump piston 8 to reciprocate and drawing the fluid, preferably oil, from the supply reservoir 32 and discharging same into the pipe 1.2. With the elements in the position shown in the drawing, the shaft 1, rod 7 and piston 4 are just about to begin their travel to the left, being in their extreme right position. The fluid from the Chamber 16 at the left of the piston 14 is, with the elements in the position disclosed, forced from said chamber at the left passing through the uncovered port 17, chamber 19, uncovered passage 20, and through the port 18 and cut-away portion 29 to the mid-portion of chamber 28 and pipe 31, from which it passes to the supply reservoir 32. The fluid discharged into the pipe 12 by the pump, flows around the annular recess formed in the valve 27 near the right end thereof, through the port 18 into the chamber 16 at the right of the piston 14. As the displacement volume of the pump 9 is very small compared with the volume of chamber 16, the fluid entering the chamber 16 at the right of the piston 14 gradually forces the piston 14 to the left. As the piston 14 approaches the left end of its stroke, the port 17 near the right end of the cylinder is gradually opened, permit-ting fluid under pressure to pass through the port 17 to the chamber 19 at the right of the small piston valve 22. As the pressure on the right end of the piston valve 22 increases, it gradually forces the oil at the left of the valve 22 out through the small port 20, moving the valve toward the left and with it the upper forked end of the lever 21, which lever in the meantime swings about the pivot 24. As soon as the axis of the tension spring 25 passes the axis of the pin 24, the spring tends to pull the end of the lever 21 toward the pin 23 by swinging the lever 21 in an anticlockwise direction of rotation about the pin 24. Since the motion of the lever after it has passed the midposition is very rapid, the forked lower end of the lever 21 imparts a blow upon the end face of the ported, large piston valve 27, causing this valve to suddenly change its position to the extreme right of the chamber 28. With this new positioning of the valves 22, 27, the annular recess near the left end of the large piston valve 27 formsacommunication from the pipe 12 to the left piston chamber, while the right piston chamber 16 is opened to exhaust. As the pump 9 continues to operate, the piston 14 and shaft 1 are gradually forced toward the right, eventually returning the mechanism to the posit-ion as disclosed in the drawing.

It should be noted, that as the rod 7 reciprocates, the eccentric 4 slides along the spline 5, thereby receiving the rotary motion of the shaft 1, but not the axial motion. The rate of reciprocation of the shaft can be readily varied by several methods, as by varying the throw of the eccentric 4, or by changing the relative volumes of the chamber of the pump 9 and chamber 16. As the rate of reciprocation for various classes of machinery varies, it might be desirable to provide a means for varying the eccentric throw.

It should be understood that it is not de-- sired to be limited to the exact details of construction shown and described, for obshaft is reciprocated longitudinally.

3. In combination, a rotary shaft, a piston connected to said shaft,and automatic means for admitting fluid under pressure to opposed end surfaces of said piston to reciprocate said shaft longitudinally.

4. In combination, a rotary shaft, and fluid pressure actuated means for periodically moving said shaft longitudinally in opposite directions.

5. In combination, a rotary shaft, and automatic means for effecting longitudinal reciprocation of said shaft by fluid pressure.

6. In combination, a rotary shaft, a piston connected to said shaft, means for admitting fluid under pressure to either side of said piston and for exhausting said fluid after admission, and automatic means for suddenly shifting the admission of fluid under pressure from one side'of said piston to the other.

In testimony whereof, the signature of the inventor is affixed hereto in the presence of two witnesses.

RAY C. NEVVHOUSE.

Witnesses:

CrIAs. L. BYRON, WV. I-I. LmBER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C.

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