US2344949A

US2344949A - Motor

Info

Publication number: US2344949A
Application number: US337966A
Authority: US
Inventors: Rappl Anton
Original assignee: Trico Products Corp
Current assignee: Trico Products Corp
Priority date: 1940-05-31
Filing date: 1940-05-31
Publication date: 1944-03-28
Anticipated expiration: 1961-03-28

Description

March 28, 1944. A, RAPPL 2,344,949

MOTOR Filed May ns1, 1940 2 sheeis-sheet 1 l INVENTOR Anggn Rappl,

ATT RNEYS @wa/M I vvmuu A. RAPPL March 2s, 1944.

MOTOR Filed May 3l, 1940 2 Sheets-Sheet 2 INVENTOIR Amon Rapp,

BY 2 ATT RKIEYs, u

Patented Mar. 2 8, 1944v Moron Anton Rappl, Buffalo, N. Y., assignor to Trico Products Corporation, Buiaio, Y.

Application May 31, 1940, Serial No. 337,966

14 Claims. (Cl. 121-97) The present invention relates to iiuid operated motors and has particular relation to motors of this type, such, for example, as those employed for operating windshield cleaners on vehicles, having means for parking the drive shafts thereof in one position.

According to the present invention means are provided, in addition to the valve means, which reverse the application of differential fluid pressures to opposite faces of the piston during normal operation, for blocking the normal channel of fluid flow to and from the motor chamber on one side of the piston and for placing the latter in direct communication with a source of pressure, for parking the piston in a predetermined position. By this arrangement a manually operated control valve may be located remotely from the motor and may be connected thereto by two conduits, one for conducting fluid for normal motor operation and the other for the uid required for'parking the motor.

The means for blocking the normal channel of flow of fluid from the motor on one side of the piston and for providing direct communication with a source of pressure for parking, comprise a pair of valve elements so connected that the first element is closed when the second is open, the first element serving to block the normal channel of uid iiow and the second opening a direct path to the source of pressure for parking.

These and other objects and advantages will become apparent from the following description of the typical embodiments of the invention that are shown in the accompanying drawings, wherein: A

Fig. 1 is a front elevational view of a motor with the valve cover removed, with certain parts broken away and appearing in vertical section, and a remote manual control valve appearing in section;

Fig. 2 is a bottom plan view of the cover section of the motor casing;

Fig. 3 is a fragmentary1` vertical sectional view taken on line 3-3 of Fig. 1 at right angles to the structure appearing in section therein;

Fig. 4 is a fragmentary vertical sectional view, similar to the portion of Fig. 1 shown in vertical section, but of a modified construction;

Fig. 5 is a vertical section taken transversel of Fig. 4 on line 5-5 therein;

Fig. 6 is a view taken along line 6-6 of Fig.

action valve operating means for the motor.

The motor casing may comprise a body section III and a cover section Il. separated by a gasket I2, and providing a motor chamber I3 in which a vane type piston, I4, may reciprocate about the axis of a shaft I5 to which it is secured, the shaft being journaled in bearings I6 of the casing.

On. casing section II is a valve seat II into which open ports I8, I9 and 2l, port I8 communieating with a nipple 22, port I3 opening through passage 23 into the motor chamber on the right side of the piston (as the parts appear in Figs. 1 and 2), and port 2| kcommunicating with a channel 24 in the cover section.

The channel 24 opens through a valve seat 25 into a cylindrical chamber 26 whose outer end is closed by a disc 21. A nipple 28 communicates,

through a passage 29, with the chamber 26, and

the latter is open, by way of a passage 3l, with a well 32 in the upper wall of the motor chamber on the left side of the piston.

A valve 33 disposed in channel 24 and adapted to close against seat 25, to block communication between the channel and chamber 26, has a stem 34 connected to piston-valve 35. The latter comprises a cup leather 36 having disc members 3l rigidifying the central or web portion thereof and having its flexible flange portions normally engaging the cylindricallwall of chamber 26.

Mounted for movement upon shaft l5 and against valve seat I'I is a valve member 38 having a recess 39 which is adapted to connect ports I8 and I9 in one position of the valve (as shown in Fig. 1) and to connect ports I3 and 2| in the reverse position of the valve. The valve opens to the atmosphere the one of ports I9 and 2l which is not in communication with port I8.

For operatingbthe valve 38 there may be employed the snap action mechanism shown in Fig. 7, which is the subject matter of Patent No. 1,978,634 grantedto Henry Hueber on October 30, 1934. This mechanism may consist of a kicker 4I which is pivoted to the shaft I5 at the axis of the latter and is engageable by one or the other of faces 42 of a recess in the end of the shaft. The kicker is engageable with ears 43 on valve 38 to shift the latter between .its two operative positions. and its outer end is engaged by a frame 44 which is anchored by a spring 45 to a'pressure plate 46. The latter is mounted over the shaft I5 upon a post 41 extended from the adjacent face of the casing section I0, and bears against the outer face of valve member 38.

When the shaft I5 moves angularly, counterclockwise as viewed in Fig. '7, right shoulder 42 will finally engage and move kicker 4I until the outer end thereof passes beyond a line extended through the center of post 41 and the center of shaft I5, whereupon spring 45 will snap the kickerv counterclockwise against the left shoulder 43 of valve 38 and move the latter to its left limit position, connecting ports I8 and 2|. Movement of the shaft in the opposite direction, or clockwise, will cause the parts to operate in the reverse manner, snapping the valve to the position shown in Figs. 1 and 7, wherein ports |8 and I9 are connected.

The

nipples

22 and 28 may be connected by conduits Il and 52, indicated diagrammatically in Fig. l, to ports 53 and 54, respectively, in the casing Il of a valve unit which may be, if desired, located remotely from the motor. A manually operated slide valve 58 has a recess 51 which in the position of the valve shown in Fig. l opens communication betweenport 53 and a port 58 that may be connected to a suitable source of less-thanfatmospheric pressure, such as the intake of an internal combustion engine, the other port 54, r'beingblocked from the suction source port 58, although preferably being vented to the atmosphere. In the other position of the valve 53, the recess 51 may connect ports 54 and 58, port 53 -being opened to the atmosphere.

With the parts in the position shown, air under atmospheric pressure may enter the left side of the motor chamber, via port 2|, channel 24,

past valve 33 into chamber 25 beneath pistonvalve 35, passage 3| and well 32, while air will be withdrawn from the right side of the motor chamber via channel 23, port I9, recess 39 in valve 3l, port |8 and nipple 22 to the source of low pressure. Accordingly, piston I4 will move to the right until the snap action mechanism reverses the valve 38, causing the low pressure to be applied to the left side of the motor chamber and atmospheric pressure to the right side. Thus the valve means will alternate application of sub-atmospheric and atmospheric pressures to opposite sides of the motor chamber, causing the piston to reciprocate.

When the control valve 58 is moved to connect ports 54 and 58, air will be withdrawn from chamber 23 via passage 29, nipple 28 and conduit 52. Since the channel 24 will be open to the atmosphere, either through port 53 or directly through port 2|, depending upon the position of valve 38, the'piston-valve 35 will be caused tc rise, closing'valve 33 upon seat 25, and thereby closing communication between port 2| and the left side of the motor chamber. Continued withdrawal will result in air being drawn from the left side of the motor chamber through passage 3| and past the flexible flange portions ocup leather 3E, causing the piston I4 to move to parked position wherein a closure 6| carried by its seats over the well 32. During such parking movement of the piston, atmospheric air may enter the right side of the motor chamber from port 53 if the valve 38 is in the position shown in Fig. 1. If the valve 381s in the opposite or reverse position, atmospheric air will enter directly through port I9. When the valve is moved to connect the ports 53 and 58, as shown in Fig. 1, the operation of the motor will be resumed since the parking port 54 will be open to the atmosphere and therefore the atmospheric pressure acting on the upper side of the piston-valve 35 will move the latter to unseat the valve 33.

In the modified structure shown in Figs. 4, and 6, a disc valve 1| closing against a fiat valve seat 12 replaces the valve 33 and seat 25 of the device shown in Figs. 1, 2 and 3 while a disc valve 13 closing against a seat 14 replaces the pistonvalve 35. Valves 1| andv 13 are separated by a valve stem 15 of such length that one valve must be open when the other is closed, and the stem is guided by radial webs 15 in the passage 11 between chamber 28 and channel 24.

The ends of the stem are preferably tapered and complementary tapered recesses 18 are formed in the'valve discs for receiving the ends of the stem. Valve 1|, when in the fully opened position thereof shown in Figs. 4 and 5, may rest upon the gasket l2, the mass of stem 15 maintaining the valve substantially centered. A ridge is preferably formed in the closure disc 19 for preventing valve 13 from :becoming excessively tipped or uncentered when in open position.

Operation is substantially the same as of the device shown in Figs. 1, 2 and 3, the valve 1| being open and valve 13 closed during normal operation of the motor, so that valve port 2| is in communication via channel 24,

passages

11 and 3|, and well 32 with the left side of the motor chamber; whereas when air is withdrawn through nipple 28, the resulting pressure differential ,between the fluid in channel 24 and chamber 2l results in opening of valve 13 and closing of valve 1 I, whereby port 2| is blocked from the left side of the motor chamber and the latter is placed in open communication with the source of parking pressure through nipple 28. The piston will then move to its parked position wherein well 32 is closed. i

If desired the valve stem 15 may be attached to the .valve 1| and 13. However, in the illustrated construction this is not done because the valves are suitably confined by adjacent walls of passage 24 and chamber 23, and fluid pressures acting upon them sulce to operate them.

It will be understood that the structures herein shown and described are merely illustrative of the inventive principles involved and that these may be otherwise embodied without departing from the spirit of the invention or the scope of the appended claims.

I claim:

l. In a. fluid pressure motor having a motor chamber and piston means movable therein, a passage for applying operating Dressur@ to the chamber and a second passage for applying a parking pressure to the chamber, the two passages adapted to be associated with means for selectively rendering either passage operative, automatic valve means for alternately directing the operating pressure from the iirst passage to the chamber on the opposite sides of the piston means, a pressure operated valve responsive to pressure in said second passage to place one side of the chamber in communication with said second passage, and a secondv pressure operated valve closing upon opening of the said rst named pressure operated valve for blocking communication between said one side of the chamber and the automatic valve means.

2. In a fluid pressure motor havinga motor chamber and piston means movable therein, a passage for applying operating pressure to the chamber and a second passage for applying a parking pressure to the chamber, the two passages adapted to be associated with means for `selectively rendering either passage operative, au-

opposite direction.

passage,` a second chamber communica;

`said passage between the valve and meter im ber, a second passage selectively operable with passage, and a second valve'closing upon opening of the pressure operated valvev ior blocking' communication between said one sidevof the chamber and the automatic valve means, said second valve being connected to the pressure operated valve for operation thereby-in one direction but movable independently thereoiin the 3. In a fluid pressure'motorhaving ainotor chamber and p iston means movabletherein, a;

- chamber and .a .second passage for.' applying a parking pressure tothe chamber, the 'tw'o passages adapted. to be associated withmeansjfor selectively rendering either passage operative, automatic valve means for-alternately directing the .operating pressure from the first passage tothe chamber on opposite sides-of the piston means,

and vmeans independentv of thel automatic valve means andl responsive to .the pressure in said sec.-`

ond passage for blocking'the application of pressure'to one slide of the chamberby the-automatic side oi' the valve means and-for connecting said chamber' vto said second passage.4

4. In a. iluid pressure mptor havingajmotor chamber andpiston means movable therein,

' means for applying, alternately, differential operating pressures. to the opposite sides of the.

chamber for 'reciprocating' the piston -means therein, apassage selectivelyoperable with thel applying means for applying pressureto one side f of the chamber for ,moving the piston means to a parked position, Sand iiuid. pressure/operated.

means'responsive'to pressure in saidpassage for substantially simultaneously opening' said pas# sage vand blocking communication between said Aone side of the' chamber and said means for applying the differential operating pressures'.

5. In a fluid pressure motor having a motor chamber and piston means movable; therein,

means `for applying pressurey to -one side .of `the. chamber for -moving the piston means to a parked position, said passage having a valvefchamber ber, each valvechamber openingthrough a valve seat into a common duct leading to said one side of the motor chamber, a v alve in eachvalve chamber connected to the companion valve '-ior plying'means and-communicating lwith thev'rst i 3 tion o! the pressure of oi' the motor chamber.

7.- In a iluid pressure motor having a .motor chamberand piston means movable therein,

means for'alternatel'y applying dliierential pres'- sures to oppositesides of the chamber and in said source topsald side.

cluding a passage on one side of the piston means,

a normally open iluid `actuated valve for closing said passage,'a second passage selectively operable with the' applying means andcommunicating with the ilrst mentioned passage between said normally open valveand the motor chamber for applying a parking' pressure tothe 'motor` cham- 1 8. Ina fluid pressure motor having a l'motor chamber -andpiston means 'movable therein,

means foralternately applying differential pressures to opposite sides of the chamber andvin- Y c luding'a' passage on one side of the pistonineans,l l anormally open valve for closing saidpassage, a

secondpassage selectively opera-ble with the ap plying means and communicating with "the'iirst ing. pressurefto the motor chamber', a normally closed valve `for said second'passzstge,` and'means lassociatingmaid, valves whereby the 1- normally 'closed'valve 'must be open when thel other valve is closed, said last mentioned meanscomprising a slidable stem disposed. between the valves.

9 In a fluid pressure motor having a motor cham'ber and .piston' means movable therein,

sures to .opposite sides of the chamber .and insecond passage selectively operable with the apmentioned passage between said normally open valveand the motor chamber for applying a parkl sociating said valves'whereby the' normally closed and said'applying means having a valve chami valve must `be open whenthe other valveis closed, said -:last lmentioned means comprising a stem disposed between the valves, and the' valves l having recesses for freely' receiving the ends of ,'said stem.

substantially simultaneouslyopeningl said pas? sage and blocking communication :between said- -one side of thechamber and said meansv for ap-v plying the differential operating pressures,` one of saidl valves being operated in respcuisev to thejj pressure in said passage.

means for alternately applying'differential pres-l sures to opposite sides of the-chamber and including afpassage .on one side of the .pistonmeans, anormally vopen valve for closing said k,

the applying means and connecting saidsecond chamber to a source of pressure for. parking the motor, yand a u'id operable member in said'sec- .10. Ina fluid 'pressure motorhaving' a motor sures .to opposite sides of' the chamber and including 'a passage on oneside ofithe piston means, a normally open valve for closing said passage, a

second passage selectively operable iwith the applying means and communicating with the iirst mentioned passage lbetween saidl normally open -valve and the motor chamber for applying a parking pressure to the motor chamber, 'a normally closedvalvel for said second passage, 'said valves having tapered recesses formed therein and a l.stem disposed'betweentaid-valves and adapted to seat in said recesses to compel one valve to be open when vthe otheris closed; and means for supporting one of said valves against ltipping v when in open position.

orld chamber between said passages, said fluid operable member being connected to the valve" for operating the latter and including a means adapted to fby-passiluid' to' eect thev applica.- 75

11. Ina suction operated motorhavlng a motor chamber. and piston means movable therein, an operating passage and a parking v`passage mentioned passage between fsaid normally lopen valve and the motor chamber-for applying a: parklmeans for alternately applying diierential prescluding a. passage on one side of the piston means', *a normally open valve for closing said passage, a

inbpressure to the motorch'amber,v a normally vclosed valve for said second-passage, means asadapte'dvto-be selectively connected'to a source according to the operation of said valve mechaalternately connecting the 'opposite sidesofthe y motor'chamber to the atmosphere and to the 0P- erating passage to eiect voscillation of the piston in the chamber when` said operating conduit is connected to a source bi.'v operating pressure, and fluid operated valve means responsive to pressure in the parking passage and actuated when-'the latter is connected toa source of pressure to shut ofi' communication between one side of the chamber andthe automatic valve means and to open communication between' said one side of the chamber and the parking passage.

13. In a fluid operated windscreen wiper moe .tor having a reciprocable piston and automatic valve mechanism for applying fluid power alternately to the opposite sides of said piston. for operating the motor, and having a control valve which is operable selectively to connect a source of uid power either :by one passage to said valve mechanism for operating the motor or by a second passage to one side only of the piston for moving the piston to a parking position and there stopping the motor, the provision of a conduit leading from said valve 'mechanism directly to said one side of the piston without passing nism when the motor is working, and valve means operable by the difference between the pressures in the conduit and the second passage for blocking said conduit when the control valveisbpratedto park the piston.

14, A iluid operated windscreen wiper motor having a reciprocable piston and automatic valve mechanism for connecting a source of iluid power alternately to opposite sides of the piston for operating the motor and at the same time venting the side of the piston not -for the time being under the influence of said source, and a control valve which when in one position connects said source through one passage to the automatic valve mechanism for operating the motor and when lin another position disconnects said source from the automatic valve mechanism and connects it through a second passage to one side onlyof the piston to move the latter'to a parking position where the piston stops, characterised in that,a conduit leads fromfthe automatic valve mechanism directly to the said one side of the piston without passing through the. control valve, a valve operable by the differential in the pressures in the second passage and the conduit and provided in the latter to prevent the venting of that side yof the piston to which said source is connected when the control valve is moved to park the piston, thereby avoiding loss of power whilst the piston is being moved to the parking position.

ANTON RAPPL.