US1740811A - Valve - Google Patents

Description

VALVE Filed Feb. 16. 1927 ATTORNEY Patented Dec. 24, 1929 ETD STATES PATENT GFFICE VALVE Application led February 16, 1927. Serial No. 168,648.

rIhis invention relates to improvements in valves and more particularly to an air control valve for air jacks of that type used in various ways with saw mill machinery, it being the principal object ont the invention to provide an automatic valve mechanism for controlling passage oi' compressed air to the ack cylinder both for the extension and return strokes of the jack. More specically stated,

the invention resides in the provision of duplicate valve mechanisms connected with a source of supply of Compressed air and adapted, respectively, to control the delivery of air to the jack for extending it and for reti-acting it; said duplicate valves being movable between open and closed positions by compressed air under the control of an auxiliary valve operable manually orelectrically.

Other objects of the invention reside in the various details of construction and combination ot parts and in their mode of operation, as is hereinatter described.

In accomplishing these and other obj ects of the invention, I have provided the improved details oi' construction, the preferred forms of which are illustrated in the accompanying drawingawherein- F ig. 1 is a central, sectional view of a valve mechanism embodied by the present invention.

F ig. 2 is a horizontal sectional view, taken on the line 2 2 in F ig. 1.

Referring more in detail to the several views of the drawings- The device, in a preferred form of construction, comprises a valve housing 1 provided across the top with a chamber 2 having a threaded opening 3 to which a pipe connection, as at 3, may be made with a source of supply of compressed air. At opposite sides of the valve housing are openings 4 and 5 with which pipes 6 and 7 are connected for the delivery of the compressed air to the cylinder of the air jack. In the present illustration, the opening 4 and pipe 6 provides for the delivery of air to that end of the jack cylinder that will cause the ack to be retracted While the opening 5 and pipe 7 provides for the delivery of the air to the opposite end oil the cylinder for the extension of the jack.

Formed in the housing 1, in parallel relation and opening at their upper ends into the air chamber 2 are cylindrical bores 8 and 9 55 which, along their lower ends, are enlarged to provide the cylinders 10 and 11; these being closed at their lower ends by plugs 10 and 11 that arel threaded thereinto. Sleeves 12 and 13 are iitted respectively in the bores 60 8 and 9 and these have openings, as at 14, therein registering with the housing openings 4 and 5 so that, under the control of valve mechanisms presently described, air may be delivered from chamber 2 into pipes 6 and 7. 65 Also, the opposite ends of the sleeves 12 and 13 are conically tapered to provide the valve seats15 and 16.

Slidably contained within the cylinders 10 and 1'1 are pistons 17 and 18 provided, respectively, with upwardly tapered valve heads 19 and 20 which are adapted to close against the valve seats 16 at the lower ends of the sleeves 12 and 13. Fixed within these pistons and extending upwardly through the sleeves 12 and 13, are rods 21 and 22 which, at their upper ends, have valves 23 and 24 fixed thereon these latter valves being adapted to close against the seats 15 at the upper ends of the sleeves. Each of these rods is of such length that when the valve at either end thereof is seated, the Valve at its opposite end will be unseated.

Centrally between the two bores 8 and 9 is a cylindrical bore 25 connected at its upper sa end by a channel 26 with the chamber 2. This bore 25 has a sleeve 27 fitted therein which is provided at its upper end with a valve seat 28. A valve 29 is adapted to close downwardly against this seat and is carried by a 9o downwardly extending stem 30 provided with a button 31 at its lower end that fits snugly within the sleeve and projects somewhat from the lower end of the sleeve so that it may be engaged for manual or mechanical adjustment of the valve 29. An air exhaust channel 32 opens from the lower end of the sleeve 27 to atmosphere and its opening into sleeve 27 is so located that it will be closed by the valve stem button 31 when the latter 10o is raised to open the valve 29 above the seat 28. Also, there is an exhaust port 35 from the lower part of cylinder 11 into the sleeve 27 and there is an exhaust port 37 opening to atmosphere from the upper end of the cylinder 10. Also, there is provided an exhaust channel 36 leading from the upper end of the cylinder 11 into the lower end portion of cylinder 10.

rlhe button 31 may be either manually or mechanically actuated for the control of the valve mechanism. It is preferred, however, to do this mechanically by use of a pivoted lever operable under the control of a solenoid, or electromagnet.

ln Fig. 1, l have indicated such a lever at 4() and a solenoid at 41 with circuit wires 42 and 43 which may lead to a switch 44 located at a point conveniently accessible to the operator.

lWith the device so constructed, and assuming that the pipe 3 is connected with a source of compressed air and pipes 6 and 7 with the jack cylinder properly for the retraction and extension of the jack, its operation is as follows: To extend the jack, the operator closes the circuit through the solenoid 41 thereby causing its core bar to move upwardly and roch the lever 40 to push the bottom 31 upwardly. This button, when so lifted, closes the exhaust channel 32 and opens valve 29 which permits air to flow from the chamber 2, through channel 26, sleeve 27 and port 35 into the lower end of cylinder 11 to thereby lift the piston 18. This opens the valve 24 so that air may then low from the chamber 2 through sleeve 13, opening 5 and pipe 7 to the jack cylinder to cause the jack to bev extended.

Wrhen the jack is to be retracted, the circuit is opened and the but-ton 31 then drops downwardly, valve 29 closes and exhaust channel 32 is uncovered by button 31 so that air exhausts from cylinder 11 beneath piston 18 to atmosphere through port 35, sleeve 27 and channel 32. This permits piston 18 to move downwardly and valve 24 to close. As the piston 18 moves downwardly valve 24 closes the upper end of the sleeve 13 and opens the lower end and the exhaust air from the jack, together with any air from chamber 2 that enters prior' to closing of valve 24, is permitted to pass from pipe 7 through sleeve 13, upper end of cylinder 11 and through channel 36 into the lower end of cylinder 10 to raise piston 17, closing valve 19 and opening valve 23, so that air may then flow from chamber 2, through sleeve 12, opening 4 and pipe 6 to the jack cylinder to cause the jack to retract.

The pressure of air in cylinder 10 under the piston 17 is gradually reduced by the escape of the ,air through the ports 45 in the closing plug 10. rThese Vports are covered by a perforated slide plate 46 mounted by a screw 47'by means of which the flow of air may be regulated by adjusting the plate to more or less cover the ports 45.

Vhen pressure of air in cylinder 10 has sufficiently decreased, lthe piston 17 moves downward, the valve 23 closes and the valve 19 is opened permitting the air in the retract pipe 6 to the jack to exhaust to the atmosphere through port 37, thus closing the cycle of operations. The time to be allowed for escape or air through the adjustable ports 45 will vary with the jack construction and nature of work.

lt is evident that compressed air, steam or other liquid may be used with this valve and that the details' or" construction may vary within the principle of the invention.

' Having thus described my invention, what l claim as new therein and desire to secure by Letters Patent, is:

1. An air jacl; mechanism of the character described comprising a compressed air chamber with outlets for connection with the elevatin@` and reti-acting sides of a jack cylinder, a control valve for each outlet, actuating means for each valve and a manually operable control means iior admitting air from the chamber to the control means of the valve for the elevating side of the jack to open that valve, and communicating means between the valve actuating means whereby exhaust air from the elevating side of the ack is caused to open the valve of the retracting side of the jack so as to admit air Jfrom the chamber through the outlet to the retracting side of the jack.

2. An air ack mechanism of the character described, comprising a compressed air chamber with outlets for connection, respectively, with the elevating and retracting sides of a jack cylinder, a control valve for each outlet, an elevating cylinder and a retracting cylinder corresponding to said outlets and' having communication therewith at their inner ends, valve `pistons in said cylinders adapted to seat against the inner ends thereof to close communication between the cylinders and their respective outlets andconnected, respectively, with the said control valves, a communicating channel from the inner end oiL the elevating cylinder to the outer end of the retracting cylinder through which air flows when the piston in the. elevating cylinder is unseated, an exhaust port in the inner end of the retracting cylinder that is uncovered when the piston in that cylinder is unseated, an air channel from the chamber into the outer end of the elevating cylinder, an atmospheric exhaust port and a control valve for the said channel and for the atmospheric exhaust port.

Signed at Everett, Vashington, this 31st day of December, 1926.

LA VERNE BRAKE.

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