US1211040A

US1211040A - Valve.

Info

Publication number: US1211040A
Authority: US
Inventors: Archie M Baird; Harvey D Palmer
Original assignee: BAIRD PNEUMATIC TOOL Co Inc
Current assignee: BAIRD PNEUMATIC TOOL COMPANY Inc; BAIRD PNEUMATIC TOOL Co Inc
Priority date: 1915-01-25
Filing date: 1915-01-25
Publication date: 1917-01-02
Anticipated expiration: 1934-01-02

Description

3D. PALMER.

IAN. 25,1915.

Patented Jan. 2, 191?.

2 SHEETS-SHEET 3.

R0 & H: VALVE? N FILED A. M. BA!

APPLICATIO A. M! BAIRD & m9 PALMER.

., VALVE,

0 APPLICATION FILED JAN-25,1915- 2,, 22 .9. 13% Patented Jan.2,1917.

9 2 SHEE,TSSHEET 2- wsm m /0 Inventors m: News #51075 Cu. Pnorou "40.. WASH/N070". n: c.

FIG

-ARCHIE 1VL BAIRD AND HARVEY PALMER, OF TOPEKA, KANSAS; SAID BAIRD ASSIGNOR TOIBAIRID JPNEUMATIC'TOOL COMPANY, INCORPORATED, OF TOPEKA,

'KANSAS, A CORPORATION OF KANSAS.

, VALVE.

: Specification of Letters Patent.

Patented Jane, 1917.

To all whom-it may concern:

' Be itknown that we, ARoHmTM, BAIRD and HARVEY 'D. 'PALMnR, citizens of the United States, residing at Topeka, in the county of Shawnee and State of'Kansas, have invented certain new andtusejful'lmprovementsin Valves, of whichthe following is a specification. 7

It'is theyobject of our'invention toflproduce a simple, durable, and e'flicient non-leaking valve suitable especiallyl'for the control "of compressed air; also to produce a non-leaking "balanced valve of this nature; also to provide for its simple construction in such manner that the parts maybe'easily asse'mbled and taken apart; also "to provide the parts, improvements, and conibinationshereinaft'er-set forth.

In the drawings accompanying and forming part'of this specification and in the "description of the'drawings we have shown our invention in its preferrediorms and what we deem to bethe best modes of ap plying the princip'les' thereof; but, within the scope of the "appended claims, 'we --contemplate changes -in form,- proportions, and ma-terials,ythe transposition of parts, and the substitution of equivalentmembers, without departing from the spirit of rourinvention.

Figure I 'is a side elevation of a valve made in accordance-with the principles of our invention. "Fig; II'is a sectional plan view. Fig. III is "a'transverse section "of the casing. "Fig. IV-is aside elevation of a modified form of the valve. Fig. V is an end elevation of ;one=half of same; Fig. VI is a plan view of the right-hand-end of Fig. IV. Fig. VII is a vertical central sectional j elevation. Fig. VIII isa sectional plan of one end of the valve casing.

' Similar reference characters indicate :similar parts throughout the several views.

Referring firsttoFigs. I, II, and. III: 1 is the, valve casing and is formed with a cylindrical valve chamberfQ, a centrally disposed inlet port'3, an exhaust port 4, and a series of peripherally alined small ports 5 which 'lead through-the casing .wall to a larger opening or passage 6 and then communicate, through the passage 8 with the main working'pistoncha'mb'e r 9 of the working cylinder1O of whichthe valve casing forms preferably an integral'part, 11 is an packing cups placed to face each other and fitting. snugly within'the valve chamber. The two

stems

17 and 18 are formed similarly to each other for the purpose of engaging the central nut and holding the washers and packing cups. Each is-formed with a screw-threaded extension 18 adapted to engage in 'thenut, and with a collar 19; and a washer and packing cup is placed at each end of the nut and held firmly there by being clamped between thenut end and the adjacent vcollar- 19. The vstem 17 is formed with an annular passage'or groove 20 which aliords communication between the working ports 5 andthe exhaust port 4 when the air is exhausted from the working cylinder; also it is formed with a stop collar 21 adapted to strike against the adjacent end of the valve casing to limit the travel of the valve; also it is formed with arms 22, between which, at 23, is pivoted one end of the operating lever 24, which'is fulcrumed at 25 to a bracket 26 extending from and formed integrally with the valve casing.

.The other stem, 18, is reduced at its outer end and formed with a shoulder 29 against which abuts the sleeve 28 which is of larger outside diameter than the main portion of the stem, and the sleeve is held in place by means of the nut '30, which is held from unscrewing by the cotter pin 31.

27 is a cap fitting over the end of the valve casing. 32 is a compression spring surrounding the stem 18 and sleeve 28 and bearing between the cap 27 and the nut 80. The travel to the right of the valve is limited by the sleeve 28 striking against the cap 27.

The inlet port 3 communicates at all times with the valve chamber between the two packing cups; and the air pressure against the flanges of the cups keeps them perfectly air tight. In one position of the valve (that shown in the drawings) the working ports 7 come readily worn out.

communicate with the exhaust. The spring holds the valve in that position and returns it to that position whenever relieved from contrary action of the lever. Thelever may be worked directly by hand or it may be operated by means of a cord as described in our Application Serial No. 827,950, filed March 28, 1914, for a pneumatic trip, of which application this present application is filed as a division. By operating the lever by pulling the handle to the left, the valve will be shifted to the right so as to bring the right-hand packing cup to the right of the working ports 5, thereby cutting off communication with the exhaust and opening communication from the inlet port to the working ports through the valve chamber between the packing cups. On releasing the lever, the spring returns the valve to its normal position.

The purpose in having the working ports 5 arranged in a plane at right angles to the axis of the valve is to have a passage of suffi ciently large area for the purpose in hand, which can be opened by relatively short travel of the valve, and which are yet so small that the leather of the packing cup flange will not be pressed thereinto and be- It will be noted that the valve itself may be easily taken apart and assembled. and that parts may be easily replaced.

The form of the passages 6 and 8 are for conveniencein manufacture, the outer end of the passage 6 receiving a plug 7.

Referring to the figures on Sheet'2: The valve here shown follows the general principles of that shown in the first threeiigures, the main difference being that this valve has two working ports and two exhaust ports and is for the purpose of reversing the ap plication of the fluid pressure from either end of a working cylinder to the other. 40 is the cylindrical valve casing formed with exhaust ports 41 at opposite ends, with an inlet port 42 located near the middle portion, and the working ports 43 near the ends but between the respective exhaust ports and the inlet port. Each working port is really composed of a vseries of small ports in peripheral alinement (as in Figs. I, II, and III) communicating with the larger opening 44 in the boss 45. On each end of the cylindrical casing is screwed a cap 46. The valve proper is made up similarly tothat already described, except that the central nut is longer, and the extensions 47 are similar to each other. On one of the extensions is screwed a stop nut 50, and onthe other is screwed a cross-head 51 to the opposite ends 52, 52 of whichare pivoted the ends of

links

53, 53, the other ends of which are pivoted at 54 to the two

legs

55, 55, respectively, of the bifurcated operating lever, which legs.

are fulcrumed at their lower ends onthe bolt 56 inthe bracket 57 formed integrally with the valve casing, the other end of the lever being formed as a handle 58. This valve also diflers from that first'describedin that it is operable both ways by hand. The valve by the dotted outlines 60, it communicatesv with the left-hand working port, closes that 3 port. to the exhaust, and opens communication b w en the right-hand working port and its exhaust. i

The first-described valve specially de- 7' v signed for a pneumatic trip, or similaroffice, where the pressure fluid is normally shut off from the working cylinder and it is only; desired that it be admitted, thereto momentarily, as by a quick jerk ofthe operating lever. The other form is designed more particularly for working cylinders operable both ways by the pressure fluid. Each is designed in most substantialform and capable i I of withstanding much hard usage, each is" easy to operate, and each is capable of holding the pressure fluid without leaking.

Having thus described our invention,

what we claim as new and desire to Letters Patent 1s:

1. The combination. of a valve casing formed with a cylinder bore .and with inlet,

exhaust, and workingports; and a valve properrreciprocatingly mounted insaid cylinder bore and comprising a central elongated sleeve formed with an axial inter secure by loo nally threaded opening and with an angular outside portion, two stems each formed lntegrally with a collar fittingin said bore and forming guides for the I valve and each'stem being formed witha screw-threaded extension engaging in opposite ends respectively of said opening, washers on the respective threaded portions of said stems and bearing against opposite ends of said sleeve, and two packing cups on the respective extensions between the respective washers and collars; one of said stems pro-- jecting axially out of said cylinder bore and there formed withan integral collar larger I 7 than the cylinder bore and adapted'to abut the end of the cylinder casing,

2. The combination of a valve casing formed with a cylinder bore and with inlet, exhaust, and working ports;and a valve re-.

ciprocatingly mounted in said cylinder bore; and, comprising a central elongated sleeve formed with an axial internally threaded opening, two stems each formed with a collar and with a threaded end said threaded ends engaging in the'opposite ends respec-- tively of said threaded opening and one of said stems extending out of the cylinder bore and formed for connection with an operating lever, two packing cups mounted on the respective threaded ends and clamped between the respective ends of said sleeve and the respective collars, each of said stems being integrally formed with its collar, threaded end, and extension, and an operating lever pivoted to the casing and connect- 10 ed with said extension.

In testimony whereof we have aflixed our signatures in presence of two witnesses.

ARCHIE M. BAIRD. HARVEY D. PALMER. Witnesses:

O. J. RosEN, J. M. STARK.

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