US2311443A - Hydraulic apparatus - Google Patents

Description

Feb. 16, 1943. R. w. KEELER HYDRAULIC APPARATUS Original Filed July 27,- 1935 WW A Zhwentor RAYMOND W KEELE 2,

BY W 7. mm

(Ittomeg Patented Feb. 16, 1943 HYDRAULIC APPARATUS Raymond W. Kceler, Galion, Ohio, assignor to The Galion Iron Works & Manufacturing Company, a corporation of Ohio i'Originail application July 27, '1935, Serial No. 33,543, now Patent No. 2,171,255, dated August 29, 1939. Divided and this application February 23, 1939, Serial No. 257,814

1 Claim.

My invention relates to hydraulic apparatus for a portable road roller of the type disclosed in my Patent No. 2,171,255, granted August 29, 1939, and one of the objects of the invention is the provision of improved and efficient pump structure particularly adapted for use in such hydraulic apparatus.

Other objects of the invention will appear hereinafter, the novel features and combinations being set forth in the appended claim.

In the accompanying drawing:

Fig. 1 is a. sectional elevational view of the combined reservoir, valve and double acting pump of the hydraulic system;

Fig.2 is an elevational view partly in section of the left-hand side of the mechanism shown in Fig. 3;

Fig. 3 is a sectional plan view taken on the line 3-3 of Fig. 3 looking in the direction'of the arrows;

Fig. 4 is a sectional plan view taken on the line 4-4 of Fig, 4 looking in the direction of the arrows;

Fig. 5 is an enlarged sectional elevational view taken on the line 5-5 of Fig. 6 looking in the direction of the arrows; and

Fig. 6 is a diagrammatic piping diagram of the hydraulic system.

This application is a division of my application for Portable road rollers, Serial No. 33,543, filed July 27, 1935, now Patent No. 2,171,255, granted August 29, 1939, and reference is made to that application for a disclosure of structural details not herein specifically disclosed.

Referring particularly to Figs. 1 and 6 of the drawing, attention is now directed to a hydraulic control system for controlling the elongated hydraulic motor or jack 56, 58 which is pivotally connected at its ends by the main frame and the supplemental frame as shown in said Patent 2,171,255. Mounted on the base 2l5' I provide mechanism 2l2 comprising a manually operable combination pump, reservoir and valve. Said mechanism 2 l2 includes a lever 2l3 for controlling the valve mechanism which controls the direction of flow of hydraulic fluid to and from the cylinder 58 of the hydraulic piston motor or jack shown'in Fig. 6.

The pressure medium is preferably oil which is placed in the casing 2I4, the latter serving as the liquid reservoir or source of supply of the pressure medium. This reservoir comprises a base 2l5' which receives a cylinder 2" which is clamped between said base M5 and a cylinder is connected to the upper end of a valve rod 2l9' which terminates in valve 254 at the lower end thereof which valve 254 is slightly tapered or frusto-conical in shape and is pressed upwardly by a spring 255 seated in a screw cap 256 at the center of the bottom or base 2I5', as shown in Fig. 1 of the drawing. 1

Fig. 3 is a sectional plan view on the line 3-3 of Fig. 1 and shows that the various passageways desired may be obtained by simple straight-line boring in the base 215 and the ends of the bores closed by means of screw plugs, as illustrated at 251, 258, 259 and 268. Valve 254 is a simple twoway valve, as illustrated particularly in Fig. 6 of the drawing.

An opening from the reservoir 2 l 4' leads downwardly through the passageway 261 into the transverse passageway 262 to the valve 254, shown in closed position in Fig. 3. When the valve 254 isin the position shown in Fig. 6, however, weight on the piston 51 will cause the liquid to move through the pipe 248 past the valve 254 and thence through the passageways 262 and 26l into the reservoir 2M. At the same time liquid can be drawn from the reservoir through the pipe 263 past the check valve 264, pipe 265, cylinder 266, past the check valve 261, pipe 268, pipe 269, past the valve 254 and pipe 246 into cylinder 58 above piston 51. In other words, this circuit will be established from the reservoir 2 I 4' to the upper portion of the cylinder 58 by suction from above head M6 by means of bolts 2l8'. The lever 2I3 the piston 51 while pressure is exerted below the latter by the weight of the piston rod 56 to force liquid into the reservoir 2M. However, if a road roller is on the roadway and it is desired to lift the front end of the vehicle frame to elevate the hitching device preparatory to hooking it to the hauling truck the alternately acting pumps shown in Figs. 2 and 6 may be operated to force liquid into the cylinder 58 above the piston 51.

When the piston 210 is formed down by the lever 235 the check valve 264 will be closed but the check valve 261 will be opened and liquid will therefore be forced through the pipes 268, 269 and 246 to the cylinder 58 above the piston 51. When the plunger 21!] is moved down, plunger 210' moving up will close the check valve 211 and open the check valve 212 to draw liquid from the reservoir 2M through the pipe 216, check valve 212 and pipe 213 into the cylinder 214. After the cylinder 214 has been filled with liquid and the plunger 216' is at the upper limit of its stroke, the reversal of the latter will close the check valve 212 and open the check valve 21I. At the same time the upward movement of the plunger 210 will close the check valve 261 and open the check valve 264. ll'he downward movement of the plunger 210 will force the liquid through the pipes 215, 269 and 246. It will thus be seen that upon each downward stroke of the plungers 210 and 210 liquid will be forced into the cylinder 58 above the piston 51.

By changing the position of the valve 254 from that shown in Fig. 6 to a position ninety degrees therefrom, the pipe 269 will be connected to the pipe 248 and the pipe 246 will be connected to the return passageway '262. Then upon operation of the manually operated pump each down-i Ward stroke of the plungers 21D and 210 will force liquid into the lower end of the cylinder 58 below the piston 51 while the liquid above it will be discharged back into the reservoir. Movement of the valve 254 to the position shown in Fig. 3 will lock the piston 51 in adjusted position in the cylinder 58 and therefore hold the aforesaid main and supplemental frames in adjusted at the same time providing a very rugged and efiicient mechanism.

It is, of course, evident that to replenish any loss of hydraulic fiuidin the reservoir or container 2| 4' it is only necessary to remove the plug in the top 2H5 illustrated in Fig. 2 of the drawing.

Obviously those skilled in the art may make ment of my invention, what I desire to secure by Letters Patent of the United States is:

As an article of manufacture, a base having a pair of pump cylinder receiving openings adjacent an edge thereof, a valve receiving recess extending entirely through the approximate center of the bottom of the base, horizontal intersecting straight line bores in said base connecting said pump cylinder receiving openings, an additional horizontal straight line bore through said recess and connected to each of said first-named horizontal bores, each of the said bores being formed from without said base inwardly. screw plugs for closing the outer ends of said bores at the outer sides of said base. a screw plug for closing the bottom of the valve recess, a bore from the top of said base to the inner end of said additional bore, a fourth straight line horizontal bore from without said base through said recess, another screw plug for closing the outer end of said fourth bore at the outer side of 'said base, and a pair of horizontal straight line bores from outside of said base to said fourth bore on opposite sides of said recess, .the outer ends of said last-named bores being screw-threaded to receive supply pipe connections leading to a motor, the bore from the top of the base serving as a drain opening for liquid returned from such motor.

RAYMOND W. KEELER;

Images