US1635692A

US1635692A - Valve-snap action

Info

Publication number: US1635692A
Application number: US751205A
Authority: US
Inventors: Fred G Schweisthal
Original assignee: Stewart Warner Speedometer Corp
Current assignee: Stewart Warner Speedometer Corp
Priority date: 1924-11-21
Filing date: 1924-11-21
Publication date: 1927-07-12
Anticipated expiration: 1944-07-12

Description

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Patented July. 12, 1927.

UNITED STATES FRED G. SCHWEISTHAL, OF CHICAGO,

SPEEDOMETIEBl CORPORATION, 0F CHICAGO, ILLINOIS,

GIN'IA.

ILLIOIS, ASSIGNOB, TO STEWART-'WARNER .A CORPORATION OF 'VIR-j VALVE-SNAP ACTION.

Application led November 21, 1924. Serial No. 751,205.

10 v In the drawings:

Figure 1 is a vertical axial section of a vacuum fuel feed tank having the valve operating connections from the float embodying this invention.

Figure 2 is a partial view, similar to Fig. 1, of the operatlng parts .of the device, the same being shown in a dierent position.

Figure 3 is a detail section at the lin'e, 3 3, on Figure .1, showing the valve snap 20 action in plan view.

Figure 4 is a. sectional view similar to Fig. 2, showing modified form of the invention.

Figure 5 is a section similar to Figure 2 26 showing another modiiication.

In the structure shown in the drawln'gs 1 is the main or outer tank member; 2 is the inner tank member or vacuum chamber; 3'is the liquid inlet to the vacuum chamber; 4 is the outlet valve from the vacuum chamber -to the main` chamber; 5 is the suction connection to the vacuum chamber; 6 is the air connection to the vacuum chamber; 7 is the suction controlling valve; 8 is the air controlling valve. The snap action for operating the valves from the iioat, A, comprises the customary levers. 9 and 10, having fulcrum-in-common'at 11, and their remote ends connected by the snap springs,

4 12, the lever, 9, being connected by a link,

. 13, with the float-connected lever, 14, which has a fulcrum at 15, ixed with respect to the vacuum chamber wall, and which is pivotall connected at 16, with the float stem, l; The valves, 7 and 8, have the customary loose pivotal connection with the lever, 10, adapting them to be operated by the snap action and to accommodate themselves to their seats by the freedom of their connection with the lever, 10, as mentioned. It will be understood that thelevers, 9 and 10, havev the usual cro-ss bars, 9 and 10, at their remote ends forattaching the opposite ends of the springs, 12, which are duplicated in the well understood manner and for the well understood reason for permitting the springs to pass the fulcrum of the levers in the snap action.

In the well understood operation of this familiar valve snap action, when the float, rising with the rising level of the liquid in the vacuum chamber, carries the sprin past the fulcrum line, causing 'the upwarssnap to occur, the lever, 10, which engages between the stops, 8, 8", of the stem of the valve, 8, is snapped up against the upper stop, 8*, and operates by virtue only of the stress of the spring and with the force due only to the tension to which the spring has been subjected in being carried past the fulcrum, 11, for breaking the air valve, 8, away from its seat against the suction tending to holdit seated. In cases of extreme suction, the reaction of the spring may not be suicient to overcome the suction hold on the valve. AIn the construction shown, however, the extension, 14", of the lever, 14, beyond its pivotal connection with the float stem being in the vertical plane of thrust of the valve, 8, and extending under the lowe'r end of the valve stem and deriving from the upward .movement of the float a vertical movement of about twice that of the float, is caused to strike the lower end of the stem of the valve, 8, a quick blow when the snap action occurs, thus overcoming the suction hold on the valve and insuring its opening when the snap action occurs under circumstances which might prevent its opening in the absence of said lever extension.

While the extension, 14, of the lever, 14, is particularly effective because its extended portion travels farther and faster than the liioat itself, this multiplication of movement is not essential to the result. Figure 4 shows a slightly modified construction in which the lever, 14X, corres ending to lever, 14, does not extend beyon its pivotal con nection with the ioat, lA, but instead, the float carries a boss, 18, and the stem of the valve, 8, is extended downward as seen at 8 for encounter with the boss, 18, as the iioat approaches the upper limit of its movement. The snap action of course accelerates this fin al portion of the iioat movement and causes it to strike a direct blow upon the extension,l 8c, for unseating the valve, 8. If

desired instead of extending the valve stem downward an auxiliary stern, 19 may be mounted on the float, A, in a supporting boss, 20, as shown in Figure 5, this stem, 19, being aligned with the stem of the valve, 8, so as to encounter the lower head or stop, 8", and dislodge the valve from its seat as the float is snapped upward at the limit of its travel.

I claim l,

1. In a device for the purpose indicated in combination with a chamber having .liquid inlet and outlet and having a fluid pressure connection at 'the upper part, a valve controlling said fluid pressure connection; a float adapted to move with the change of level of the liquid; a snap action connection between the valve and the float comprising a pivoted lever pivotally connected with the float and extended from the float pivot in a plane for encounter of its extension with a valve-connected part in the snap movement whereby the snap action causes the lever extension to strike a blow for displao ing the valve from its seat.

2. In a device for the purpose indicated, in combination with a chamber having liquid inlet andoutlet and having a suction connection for producing partial vacuum above. the liquid and an atmosphere connec-` tion for defeating such partial vacuum, a valve controlling the air connection; a float adapted to move with the change of level ot' the, liquid, a snap action connect-ion between the valve and the float. comprising a lever pivotally connected with the float and extending a free end portion from said pivotal connection in a plane for encounter of said extension in the snap movement with a valve-connected part, whereb7 the lever extension is caused to strike a blow for breaking the suction hold on the air valve in the movement of the float due to the rise of the liquid level.

3. In a device for the purpose indicated, in combination with a chamber having liq uid inlet and outlet and having a fluid pressure connection at the upper part, a valve controlling said fluid pressure connection: a float adapted to move with the change of level of the liquid; a snap-over device con nected with the float and means connected withthe snap-over device for striking the Leemans valve in the direction for displacing it from its seat, having in the snap an extended range of movement for acquiring momentum before it encounters the valve.

Y 4. In a device for the purpose indicated, in combination with a chamber having liquid inlet and outlet and having a fluid pressure connection at the upper part, a valve controlling said fluid pressure connection, a float adapted to move with change of level of the liquid, a snap action connection between the valve and the float including a le ver pivotally connected to the float and having a free end portion farther from the lever ulcrum than said pivotal connection, whereby said free end has a wider range of travel than the float; said end portion moving in a plane for encounter with a valveconnected art in the snap movement for striking a lilow tovdisplace the valve from its seat.

5. In a device for the purpose indicated, in combination with a chamber having liquid inlet and outlet and having a fluid pressure connection at the upper part, a valve controlling said fluid pressure connection, a float adapted to move with the change ot' level of the liquid, a snap-over device connected with the float and with the valve designed to accelerate the movement of the float as it approaches its limit of travel and means carried by the float for direct en- .counter with a valve-connected part in said accelerated movement for displacing the valve from its seat.

6. In a device Vfor the purpose indicated, in combination with a chamber having liquid inlet and outlet and having a fluid pressure connection at the upper part, a valve controlling said fluid pressure connection, a lioat adapted to move with the change of level of the liquid, a. snap-over device connected with the float and with the valve designed 'to accelerate the movement of the float as it approaches its limit of travel and means positively connected to the float in position for direct encounter with a valve connected part for striking a blow to displace the valve.

In testimony whereof, I have hereunto set my hand this 19th day of November, 1924. FRED G. SCHlVEISTHAL.