US2221150A - Controlling hydraulically actuated devices - Google Patents

Description

"-Nov. 12, 1940. H. REBESKI CONTROLLING HYDRAULICALLY ACTUATED DEVICES 3 Sheets-Sheet 1 Filed Nov. 26, 1937 m-m m M mi ERSL vii ll? 1 IIIII llllllllll I! '11! III! 'IIIIIIIIIIIIII'IIIA.vIIIIIIIIfl VII/II I Faiented Nov. 12, 1940 coN'rnoLLnvGnYnnaUucALLY ac'rua'rnn DEVICES Hans Rebeski, Brandenburg, Germany, asslgnor to Arado Flumugwerke Gesellschait mit beschrankter Hattung, Brandenburg, Germany,

a German company Application November 26, 1937, Serial No. 176,767 In Germany December 5, 1936 3 Claims.

to which is regulated by a common valve interposed in the medium supply and return pipes.

I Inhydraulic presses a displaceable bolt for actu- 15 ating an excess pressure valve is displaced during the pressure balancing periods by the water in thepressure chamber to such anextent that a connection between the pressure chamber and the pressure balancing conduit is established;

20 In the pumps referred to a valve disposed in parallel between the high and low pressure conduit is indirectly actuated by a definite pressure in the high pressure conduit in such manner that it opens a direct connection between the 5 conduit connecting the low pressure and the high pressure pumps and the oil container.

In these known arrangements the valve controlling the supply of working medium isactuated by a definite pressure of the working me- 30 dium produced in the supply conduit.

Moreover displacing devices have also been suggested in whicha valve controlling the supply of worldng medium is actuated in dependence on the movement or displacement or the corre- 35 sponding structural member by this member itself.

In these displacing devices a piston 01' a control cylinder follows the movement 01' the structural member displaceable with the aid 01 a 4 working cylinder until the desired position of the parts is attained and finally then at this moment closes the conduit through which the working medium, for example oil or compressed. air, is supplied to the control cylinder. As how- 45 ever the pump for the working medium operates continuously there is a possibility that the working medium which after the said closing of the supply pipe is compressed still further in the conduit can escape by an excess pressure valve.

50 The pump during the whole time for which no pressure is required has to overcome the comparatively high pressure to which the valve is adjusted. It should also be noted that the interval of time during which no pressure is re- 55 quired may be comparatively long particularly when the structural member is in its initial position. .As a result in such cases the pump is excessively heavily stressed.

The invention avoids the disadvantages mentioned by this that the valve through the com- 5::

mon action of a member provided for switching on the displacing device and an auxiliary member moving together with the structural member. in the initial position of the structural member, holds open a direct connection between 1 the supply and return conduits, but holds it closed in all other positions of the structural member.

In these other positions of the structural member, the valve or regulating member for the 1 supply of fluid to the device mentioned for moving the structural member automatically into its closing position, and the means for adjusting the regulating member by the hand actuated switch means for the moving or displacing device and the auxiliary member moving with the structural member are actuated.

Further features of the invention. are here'- -inafter described in detail in connection with the accompanying drawings. 1

In the drawings is shown diagrammatically one example of an arrangement in accordance with the invention showing the application 01 a hydraulic device for displacing or turning aircraitlanding flaps.

Fig. 1 shows the device in accordance with the invention in side elevation partly in section and also in perspective the part to be moved in its initial position.

Fig. 2 shows the device in accordance with the invention in sideelevation partly in section at the commencement of displacement of the part'to be moved from its initial position.

Fig. 3 shows the device in side elevation and partly insection and also in perspective the 49 structural part to be moved being in its operating position. I Fig. 4 shows the device in accordance with the invention also in side elevation and partly in section at the commencement of the return movement of the structural member to be moved from the working position into the initial position. a

Referring to the drawings, the supply conduit, designated I supplies pressure medium, such as 50 oil under pressure, for actuating the motor means and the pressure medium is supplied thereto preferably by a continuously operating pump, not shown. The corresponding return conduit, through which the pressure medium is 66 by-pass passage 6 which, at its right hand end,

communicates with a supplypassage having an enlarged chamber containing a valve ball l2 forming the valve member, which valve member is normally resiliently seated by the spring 23 and which is adapted to be positively unseated by means hereinafter described. The valve seat is designated 35 and delimits the right hand end of the by-pass passage 6.

In the open position of the valve member i2, when it is displaced from its seat 35, as shown in Fig. l, the pressure medium flows in the direction of the arrows through passages l, 6 and 2. In the example illustrated, I designates the structural member desired to be controllably moved which is illustrated as the landing flap of an airplane.

The means for controlling the control valve 3 and the adjustable valve member |2 oi the regulator valve 5 consists of the double armed lever 8 rotatable about a pivot H which lever is pivotally connected with the casing of the control valve 3 at 3|! and at its upper end preferably carries aknob or grip for operation by hand. The lever B can act with its lower end 35 in its swinging movement about the pivot I4 on the one arm of a double armed lever II. The end so of an auxiliary lever 9 rotatable about a fixed pivot l9 can act on the other arm of this lever II.

The double armed lever H is pivotally connected at its central portion with a plunger Hi, the one end of which projects from the valve 45 housing 5 and which plunger is movable longitudinally in the passage 3 in such manner that the free end thereof is engageable with the ball |2 for moving it from its seat 35 *against the pressure of the spring 23 as shown in Fig. l. 50 To limit its outward movement the plunger I0 is provided with a stop collar which bears, in the position shown in Fig. 3, against the regulator valve housing 8. A spring 34 or other resilient member fixed at one end and at the other end 55 connected with the plunger l0 tends to move the plunger l0 into the position shown in Fig. 3.

The spring 34 could naturally also actin another manner, in the direction mentioned, on the plunger m.

The relatively shiftable members of the control valve device 3 consists for example of a cylinder in which a control piston |3 provided with suitable control passages is movable longitudinally. The piston I3 is pivotally connected 65 at its right hand end with an arm 29 which is mounted on a shaft supported in bearings at 32 and 33. This shaft l'| carries the structural member to be moved in the form of the landing flap I and is displaced or turned by the piston 70 I3 movable in the cylinder 4 or the motor means.

To this end the piston rod 24 of the piston I3 is rotatably mounted on an arm 25 carried by the shaft H. The arms 25 and 28 mounted on the shaft H are approximately similarly directed. 75 The shaft carries at its opposite end a further I8 reciprocable therein and provided arm 28 which acts by means of the pivoted rod 20 or the like in its turning movement on the said lever 3.

The supply conduit between the regulator valve housing 5 and the casing of the control valve 3 is designated 2|. The corresponding return conduit for returning the pressure medium from the control valve 3 to the regulator valve is designated 22. The supply conduit extending between the control valve casing and the cylinder 4 of the motor means is designated l5 while the corresponding return conduit is designated IG. The conduits |5, |3, 2| and 22 are necessarily flexible because of the relative movement occurring between the motor means, the control valve 3 and the regulator valve. The path of the pressure medium in the various operative positions of the parts of the device is indicated by arrows in the respective figures of the drawings.

The modus operandi oi the motor means. control and regulator valves in accordance with the invention is as follows:

As is clear from Figure l in the starting position of the arrangement, if the regulator valve 5 were not present the oil or pressure medium supplied through the conduit I under pressure would pass through the conduit 2| into the casing of the control valve 3 and collect there as the conduits I5 and ii are closed by the control piston. It must therefore flow through an excess pressure valve provided in the oil supply conduit into the return conduit 2. In order to avoid this, for the reasons mentioned above, the regulator valve 5 is interposed between the conduits and 2. The valve 5, in the initial position of the landing flap 1, provides a direct communication through the passage parts of the transverse passage 6 between the conduits and 2 since the ball l2, in consequence of the positions or the initiating member 8 and of the auxiliary member 9, is lifted by the plunger In from the valve seat 35.

If the landing flap is to be shifted from its initial position (Fig. 1) into the operative position (Fig. 3) the movement initiating member comprising the manually operable lever 3 is brought to the position shown in Fig. 2 and with it casing of the control valve 3 is shifted to the right. The lower end 36 of the lever 8 thus swings to the left and the lever moves into the position shown in Fig. 2, since the auxiliary member 3 is in its initial position, the plunger ID with the ball I2 is pressed to the left by the spring 23. By the consequent seating of the ball l2 on its seat 33 the communicating passage 6 is closed and the oil or pressure medium from the conduit I, since the control piston at present also is in its initial position. passes through the conduits 2| and |5 into the cylinder 4 of the motor means and there acts on the piston l3.

The piston I3 is moved to the right and moves the landing flap I through the medium or the piston rod 24 and of the lever arm by rotation of the shaft into its working position shown in Fig. 3. The oil or pressure medium at the right hand 01 piston |8 is thus forced through conduit l6 into the casing of the control valve 3 and further through the bores 23, 21 of the control piston |3 into the return conduits 22 and 2. In consequence of the rotary movement of the shaft H the auxiliary lever member 3 is now turned about its axis IS, on the one hand, by the lever arm '28 through the connecting rod 20 and the lever H and the plunger ll finally assumes 2,%21,150 the position shown in Fig. 3 when the flap 1 is in its operative position; On the other hand on the rotary movement of the shaft 11 through the medium of the lever arm 29 the control piston it landing flap I is always balanced by the oil pres-1 sure acting on the working piston la.

The passage 2| which is subject'to fluid pres- I sure only during actuation of the regulated structural element is preferably provided with suitable known excessive pressure valve means (not shown).

It the landing flap l is to be returned from its operating position shown in Fig. 3 into its initial position the lever 8 is turned into the position shown in Fig. 4 and the cylinder of the control valve 3 is thus moved to the left. The lower part of the lever 8 thus swings to the rightand the lever Ii movesinto the-position shown in Fig. 4. The plunger i is not moved as the auxiliary member 9 at the beginning of the return movement of the flap is still in its position shown in Fig. 4.

If the casing or cylinder of thecontrol valve 3 is shifted to the left the control cylinder and piston at this moment are in the position relative to one another shown in Fig. 4. The oil or pressure medium coming from the supply conduit i passes therei'ore into the cylinder 4 of the motor means and displaces the piston IBto the left therein.- The shaft i1 is thus rotated in counter-clockwise direction through the medium of the rod 24 and of the lever 25 and the landing flap 1 returns gradually to its initial position. The pressure medium at the left of the piston is thus forced through the conduit l and the easing or cylinder of the controlvalve I into the return conduits 22 and 2. I

With the movement or rotation of the landing flap the piston I3 of the control valve 3 is also moved to the left until the landing flap 1' has reached its initial position. At this moment the control piston It then closes the connections between the casing or cylinder of the control valve 3 and the conduits l5 and i6. Moreover, on the return movement of the landing flap I, the auxiliary member 9 is turned about its pivot i8 to the right by the lever arm 28 through the connecting rod and the lever ii, and the plunger III is thereby brought to the initial position shown in Fig. 1. The plunger Ill thus unseats the ball valve member I! from the valve seat 35 during the last part of its rightward movement so that the direct connection between the conduits I and 2 is provided by the passage 6 as soon as the landing flap has reached its initial position. All the parts of the device are then again in the position shown in Fig. 1.

I claim:

1. In fluid pressure means for controlling a movable element including fluid motor means a pressure fluid source,

operatively connected to said movable element, control valve means for controlling the supply of fluid to said motor means including a movable cylinder and a piston reciprocable in said cylin- 'der and connected with said movable element for movement therewith, supply and return connections extending to said controlvalve means from a regulator valve having therein supply and return passages forming.portions of said supply and return connections, a by-pass passage inv said regulator valve adapted when open to connect said supply and return passages in said regulator valve, normally closed valve meansin said by-pass passage, and valve operating means responsive to predetermined positioning of said control valve cylinder and said movable element for opening said by-pass passage.

2. Apparatus according to claim 1, said valve means including a ball normally spring pressed to seating position, and said valve operatingmeans' including a plunger normally resiliently withdrawn from said ball, a double armed lever pivoted on said plunger, a manually operable lever for moving said control valve cylinder and having an end portion engageable with one arm of said double armed lever, and an auxiliary lever member'engageable with the other arm of said 'double armed lever and connected with said movable element for movement therewith.

3. In an apparatus for controlling the flow of pressure fluid in a device containing control valve members relatively movable by manual actuation of a lever having a fixed pivot, said control valve members controlling the supply'and return of fluid from the cylinder of a fluid motor having a piston reciprocating therein, said piston having a connecting rod operatively connected with a structural member for imparting movement thereto, the combination or a valve member connected by passages with the supply and return conduits from a control valve device and movable automatically into its closing position for the supply of fluid through said control valve to said fluid motor, and operating means for means including a double armed lever connected with said valve member, said double armed lever being engageable at one end with said manually actuated lever for movement thereby and engageable at the opposite end by an auxiliary member movable with the shiftable structural member and including a lever rotatably mounted on a fixed pivot, said double armed lever of the operating means being released by said manually actuable lever at the beginning of the displacement of the structural member from initial to adjusted position in such manner that in turning about said auxiliary member, it controls the said power transmission member to such extent that the valve member moves into its closing tion. o posi HANS REBESKI.

opening said valve member, said operating

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