US1968467A - Valve for molding machines - Google Patents

Description

My 31, 1934. R F. RINGLE 1,968,467

VALVE FOR MOLDING MACHINES Filed May 29, 1929 2 Sheets-Sheet l INVENTOR Jufly 31, 1934. x R RlNGLE 1,968,467

I VALVE FOR MOLDING MACHINES Filed May 29, 1929 2 Sheets-Sheet 2 INVENTOR UNITED STA Patented July 31, 19 34 TES VALVE FOR MOLDING MACHINES Robert F. Ringle, Zelienople, Pa., assignor to Herman Pneumatic Machine Company, Zelienople, Pa., a corporation of- Pennsylvania Application May 29, 1929, Serial No. 366,863

1 Claim.

Myinvention relates to improvements invalve for molding machines of the type used for agitating a mold and its flask for jarring, so as to tamp the sand evenly and compactly around the pattern, similar to that shown in prior patent of Herman et al. No. 908,002, issued December 29,

Generally stated, the machine comprises a foundation baseor frame having a centrally arranged cylinder, a vibrating table provided with a plunger mounted in the cylinder, an automatically operating valve for admitting and releasing pressure to and from the cylinder for alternate operation of the plunger and table, with guiding means at the corner portions of the frame and table, a fluid supply and lubricating system, etc., asmore fully hereinafter described.

The improvement herein involved relates to the controlling valve for admitting pressure fluid to the plunger and releasing it therefrom auto-' matically, in conformity with the alternating reciprocations of the table.

Referring to the drawings showing one preferred embodiment of the invention:

Fig. 1 is a vertical sectional View through one side portion of a jarring machine showing the table and its plunger lowered;

Fig. 2 is an enlarged vertical sectional view of the valve in corresponding lowered position for I supply of pressure to the plunger;

Fig. 3 is a similar view showing the valve post raised and the valve open for exhaust;

Fig. 4 is a detail view of the valve post detached, in elevation.

The valve mechanism is combined with a jarring machine like that shown in said patent. In said machine the plunger cylinder 4 for plunger 5 is incorporated with the main base 2, and is provided at its bottom .with a pressure and exhaust fluid port 3. 1

The outer portion of the base extends upwardly above the middle transverse floor portion 8 by outer walls 9, between which the jarring table 12 extends downwardly for bumping action against an intervening transverse jarring plate 10. The latter is laid across the middle floor portion 8 of the machine with middle clearance of the plunger cylinder, and with an intervening comparatively thin sheet 11 of suitable shock absorbent material,

7 as fibre, cork, or the like, whereby to absorb the shocks of impact.

The table 12 extends across the entire upper portion of the supporting base frame by its upper table top and its bottom 14 normally rests on the jarring plate 10. The middle interior portion of the table is provided with an annular frame or' ring 15 against which abuts and to which is secured the upper flange 16 of plunger 5.

The plunger is alternately raised and lowered by admission of fluid under pressure and release through the valve casing A.

The post or pilot valve 19 of the main valve extends upwardly into range of the lower abutting shoe end of a bunter rod 17 secured by any suitable means as a bolt 18 in the lower body portion of the table at one side of the plunger cavity, with suitable clearance openings through the impact plates and the base floor, as in Fig. 1. The construction of the valve and its parts is such that at all times during application of pressure to the valve through pipe 43 the post 19 is maintained in contact with the bunter by lifting pressure against the lower end'of the post, avoiding shocks of impact. Thus on upward movement I i the plunger 5 the valve post follows the bunter in contact with it, and on reverse downward movement, the bunter depresses the post against the constant fluid pressure on its lower end.

I have provided a single double acting pressure and release valve 20 having a lower pressure controlling face 21 and an upper enlarged exhaust controlling face 22. The casing of valve A is cylindrical, provided with a transverse ported partition 23 having a seat 24 for face 22 of valve 20 opening into the annular middle exhaust opening 25 of the casing. Opening 25 is in open communication by port 26 with waste connection 27 leading to any point of exhaust discharge.

The lower end of the casing is provided with a chambered section 28 having a middle conduit 29 provided with an upper valve seat 30 for pressure controlling valve 21, communicating with pressure supply pipe 43, and having a lateral bypass port 31. Said port communicates through conduit 32 of connection 33 with inlet and outlet port 3 of plunger casing 4:.

By-pass port 31 opens at the top into annular chamber 34 of the main valve casing between its valve seats 2e and 30. I

Valve 20 is provided at its upper end with a plunger head 35 having a packing ring 36 subject to pressure from above for seating the pressure controlling valve 21 to cut off lifting pressure from plunger 5 when it has reached the limit of its upward movement. Such pressure is controlled by circulation efiected by upward movement of hollow valve post 19, having the central opening 3'? and a series of lateral ports 38 opening into an outer annular channel 39. Valve 20 is provided with an upper cylindrical extension 40 having a limited up and down movement with the valve through packing gland 41 in the valve casing top 42. Shell extension 40 is provided with lateral ports 51 through which circulation is established from opening 37, ports 38 and annular channel 39 when the post is raised, as in Fig. 3.

In such position pressure on the plunger closes valve 21 against pressure supply, and at the same time opens valve 22 for exhaust, as indicated by the arrows.

Upon lowering of the plunger 5 following such release bunter 17 also lowers the telescoping post 19 efiecting release of air from the plunger 35 and allowing pressure from pipe 43 to lift valve 20 and its lower seat 21 to supply pressure for the next upward movement of plunger 5, as in Fig. 2. For providing release of pressure from plunger 35 at the termination of downward movement of plunger 5, post 19 is provided with another series of lateral ports 46 opening outwardly to an annular channel 47 and inwardly to a central bore 48 which communicates through ports 49 of bunter-contacting head 50 with the atmosphere.

Sleeve 49 of valve 20 has a series of lateral ports 51 through which pressure may escape from above the valve plunger 35 -36 when post 19 is lowered, as in Fig. 2, to establish escape circulation through annular channel 47, ports 46, bore 48 and ports 49.

In this manner the hollow valve post 19 in connection with the independently movable valve 20 and its ported sleeve l0 provides for positive seating of valve 22 to cut off pressure to plunger 5 at the limit of its upward travel, and also for release of pressure on the valve 20 when the plunger has again descended, allowing for recurrence of lifting pressure for the nest upward movement.

For the purpose of lubricating the moving parts of these members, lubricant is admitted from grease cup 52 through port 53 when sleeve l0 is elevated as in Fig. 2 and by said port to "the inner surface of said sleeve against the outer surface of stem 19.

The construction and operation of my improved valve will be readily understood and appreciated from the foregoing description. It is comparatively simple in construction and capable of continuous efficient functioning under the conditions present in connection with a bumping machine for foundry practice, or with any other reciprocable mechanism requiring rapid alternation of movement. The valve is entirely selfcontained, and the working parts are all protected from sand or other foreign matter, while in operation the movements may be increased or decreased as to velocity by control of the actuating pressure.

It will be understood that the invention may be made in various sizes or modified in detail construction or design or otherwise changed by the skilled mechanic to adapt it to particular conditions of use, but that all such changes are to be understood as within the scope of the following claim.

What I claim is:

In combination with a jarring machine having a cylinder provided with a single duct constituting an inlet and outlet port and a reciprocable table having an actuating plunger in the cylinder, a valve casing having a single duct constituting a supply and an exhaust passage communicating with said first duct through intervening valve seat openings, a hollow valve having a pressure controlling disk face and an opposite exhaust controlling disk face and a pressure head and a port leading thereto, a pilot valve in continuous engagement with said table slidably telein the hollow valve provided at each end beyond an intermediate solid portion with a pressure circulating port and an exhaust circulating port, one end of said pilot valve being exposed to pressure at th pressure face of the hollow valve, sa d ports of the pilot valve being out of communication with each other whereby pressure is admitted through one of them to the pressure head while in registry with the port of the hollow valve, the pilot valve will then move to close the latter port and thereafter cause registry of the latter port and remaining port of the pilot valve to exhaust the pressure previously admitted from the pilot valve to the pressure head, and means supplying fluid pressure to the pressure face of the hollow valve and said end of said pilot valve.

ROBERT F. RINGLE.

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