Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
  • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
  • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
  • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
  • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
  • F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
  • F15B13/0422—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with manually-operated pilot valves, e.g. joysticks
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T137/00—Fluid handling
  • Y10T137/8593—Systems
  • Y10T137/87056—With selective motion for plural valve actuator
  • Y10T137/87064—Oppositely movable cam surfaces
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T137/00—Fluid handling
  • Y10T137/8593—Systems
  • Y10T137/87056—With selective motion for plural valve actuator
  • Y10T137/87072—Rotation about either of two pivotal axes

Definitions

• the present invention relates to pressurized fluid distributors which are used to allow the control, from a member operated by hand, of one or more downstream devices which operate with a pressurized fluid.
• the invention relates to hydraulic manipulators which are intended to control different hydraulic functions of a public works machine for example.
• a body comprising at least one cavity, one end of which opens out onto at least one face of the body, - at least one pressure reducing valve which is mounted in the body, and which comprises a pusher mounted movable at the opening end, a plunger mounted in the cavity and a regulating spring interposed between the pusher and the plunger, said plunger being mounted oscillating in translation to perform the function of pressure reducer, and the balance of which depends on the compression of the regulating spring imposed by depression of the pusher and of the regulating pressure at the outlet to be delivered to a downstream device,
• control member capable of modifying the depression of the pusher in order to control the value of the pressure delivered, the control member being pivotally mounted opposite said face of the body and comprising at least one finger,
• Solenoid forming means which are capable of delivering a magnetic field in a direction substantially parallel to the direction of translation of the plunger, which are mounted in the body being substantially coaxial with the pusher and which define a bearing surface which is substantially coplanar with said face of the body,
• a frame capable of being driven in translation simultaneously with the pusher, made of a material sensitive to the magnetic field, and which comprises a contact surface located opposite the bearing surface belonging to the means forming the solenoid, so as to come into abutment against this bearing surface to lock the pusher in position with a predetermined force of attraction.
• a first drawback lies in an untimely disengagement (also called hereinafter lifting) of the armature outside the solenoid means. Indeed, when moving public works vehicles on construction sites, the distributor mounted on board such vehicles undergoes accelerations and decelerations which induce pull-out forces on the frame greater than the attractive force exerted on this frame by the magnetic field. This is further accentuated by the inertia of the control member.
• a second drawback lies in the fact that the operator may, during the tearing phase, not have to exert an action with a predetermined force on the control member. He therefore does not know precisely when the armature was disengaged from the solenoid.
• the present invention aims in particular to overcome these drawbacks by providing a fluid distributor for which the disengagement phase of the armature from the solenoid can only occur with a force maintained at a predetermined level and this, by means simple, efficient and inexpensive.
• a fluid distributor of the aforementioned type is essentially characterized in that it further comprises means for hooking the armature to the finger which delimit a window in which the finger projects substantially transversely, in that the pusher is mounted through with clearance in the frame to project into the window, and in that the finger is interposed between the hooking means and the pusher.
• the attachment means and the frame together delimit the window.
• the attachment means comprise a stirrup which defines the upper upright and the side walls of the window, the lower upright of the window being defined by the frame.
• the finger is in point contact with the upper upright of the window.
• the finger comprises a spherical tip on which the upper amount of the window bears.
• the frame comprises a washer made of ferrous material.
• stirrup is overmolded on the washer.
• stirrup and the frame came integrally together.
• the upper upright and the side walls are attached by screwing onto the washer.
• the side walls are then in the form of open troughs in which screws are housed.
• FIG. 1 is a view in partial section of a fluid distributor equipped with a frame according to the present invention.
• Figure 2 is a side view, partly in section, of the frame mounted on the finger of the control member.
• Figure 3 is a sectional view of the frame provided with attachment means according to the present invention.
• Figures 4 and 5 are side and top views of a second embodiment of the hooking means of the frame according to the present invention.
• Figures 6 and 7 are views similar to Figures 4 and 5, of a third embodiment of the attachment means according to the present invention.
• Figures 8 and 9 are views similar to views 4 and 5 of a fourth embodiment of the attachment means of the frame according to the present invention.
• FIG. 1 A distributor of pressurized fluid, and more particularly a hydraulic manipulator, is shown in FIG. 1.
• the fluid is supplied to a downstream device not shown under a pressure which is suitable for the use which is made of it.
• the pressurized fluid distributor comprises at least one pressure reducer 2.
• it is equipped with four pressure reducers identical to each other.
• Each pressure reducer 2 comprises a plunger 3 which can move in a cavity 4 formed in the body 5 of the distributor.
• the setting of the pressure reducer is controlled by an operator by the action on a control member 6 (partially shown in Figure 1).
• This control member is mounted on a joint 7 which is carried by the body 5 of the distributor 1, at one of the faces 8 of the body 5.
• This joint is for example of the cardan type, a spherical joint, or else still a pivot link.
• the cavity 4 has one end 9 which opens onto the face 8 of the body 5.
• the control member 6 has, moreover, a finger 10 which extends from the articulation 7 to protrude substantially vertically of the plunger 3 mounted in the cavity 4.
• the pressure reducer comprises, in a manner known per se, a pusher 11 and a regulation spring 12 so that under the action of the control member 6, the pusher 11 has a reciprocating translational movement inside the cavity 4, at the through end 9 of this cavity.
• control member 6 makes it possible to modify the position of the pusher 11 to control the calibration of the pressure reducer and therefore the value of the pressure delivered by the distributor to the downstream device (not shown).
• the operation of such a fluid distributor is well known to those skilled in the art, and is for example described in the document FR-2 376 978 or FR-2 507 732 or even in FR-2 781 846.
• the pressurized fluid distributor has solenoid means 15 cooperating with an armature 16 for locking the pusher 3 in position in a predefined position.
• the solenoid means 15 consist for example of a coil. This coil is mounted in the body 5 substantially coaxially with the pusher 11. One end of this coil opens out at the face 8 of the body 5 to define a bearing surface 17 substantially coplanar with this face. This bearing surface 17 can also be slightly set back relative to the face 8, while being substantially parallel to this face.
• the coil 15 thus delivers a magnetic field in a direction substantially parallel to the direction of translation of the pusher 11.
• the frame 16 is capable of being driven in translation simultaneously with the pusher 11 and is made of a material sensitive to the magnetic field, such as a ferrous material.
• This frame has a contact surface 18 which is located opposite the bearing surface 17 so as to abut against this bearing surface 17 in a predefined position of the pusher 11. In this position, the pusher is thus blocked with a predetermined force of attraction between the armature and the coil.
• the fluid distributor 1 also has hooking means 20 for the armature 16 on the finger 10 of the control member 6. These hooking means make it possible to secure in movement the armature 16 with the finger 10, so that the armature 16 is somehow suspended under the finger 10.
• This armature thus has five degrees of freedom so that its contact surface 18 is permanently parallel to the surface support 17 of the coil and this, despite a possible slight offset between the axis of the pusher 11 and the direction of the force exerted by the finger 10 on the attachment means 20 during movement of the pusher.
• attachment means 20 are located opposite the face 8 of the body 5 relative to the frame 16. These attachment means 20 (FIG. 2) define a window 21 in which the push button 11 after having crossed the frame 16. This pusher is mounted through with clearance in this frame.
• the finger 10 is placed in the window substantially transversely to the latter to be interposed between the attachment means 20 and the pusher 11.
• the pusher 11 is immobilized in translation relative to the finger 10 by means for example of a circlip 22 mounted in abutment on the frame 16, inside the window 21.
• the hooking means 20 take the form of a stirrup 25 situated above the frame 16 to define, with this frame, the window 21.
• the upper upright 26 and the side walls 27 and 28 are thus defined by the stirrup 25, while the lower upright 29 of this window is defined by the frame 16.
• the stirrup 25 is in point contact with the finger 10 at the upper upright 26 of the window 21.
• the finger 10 has a spherical end piece 30. More particularly, this end piece is for example hemispherical, so that the upper upright 26 bears almost punctually on the spherical part of the end piece 30.
• the pusher 11 is resting against the tip 30 according to a point contact, opposite the contact between the tip 30 and the upper upright 26.
• the frame 16 takes for example the shape of a washer. As is more particularly shown in FIG. 3, the stirrup 25 and the washer 16 are integrally formed.
• the stirrup 25 is attached by screwing onto the washer 16, as shown in Figures 4 and 5.
• the side walls 27 and 28 then take the form of spacers 35 and 36 on which is placed a deck 39 coinciding with the upper upright of the window.
• Screws 37 and 38 pass through the spacers to secure the bridge and the spacers on the frame 16, substantially perpendicular to the plane defined by this frame.
• the bracket 25 is further attached by screwing on the washer 16, as in the variant shown in Figures 4 and 5.
• the bracket 25 is made in one piece in the form of clip, for example of metallic material. It now has two ends 40 and 41 which are folded towards the inside of the window, parallel to the frame 16. These two ends are fixed by screwing to the frame.
• the stirrup 25 is attached by clipping onto the washer 16. For this purpose, this washer has lugs 45 and 46 which protrude from the face of the washer 16 opposite its contact surface 18 to penetrate into the side walls 27 and 28. The stirrup is then for example made of plastic.

Landscapes

• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Fluid Mechanics (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Magnetically Actuated Valves (AREA)
• Manipulator (AREA)
• Servomotors (AREA)
• Preventing Unauthorised Actuation Of Valves (AREA)
• Mechanically-Actuated Valves (AREA)
• Safety Valves (AREA)
• Coating Apparatus (AREA)
• Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
• Superconductors And Manufacturing Methods Therefor (AREA)
• Nozzles (AREA)
• Electromagnets (AREA)
• Fluid-Damping Devices (AREA)
• Catching Or Destruction (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=32104368

Family Applications (1)

Country Status (8)

Cited By (1)

Families Citing this family (5)

Family Cites Families (10)

• 2002
  • 2002-10-31 FR FR0213689A patent/FR2846719B1/fr not_active Expired - Fee Related
• 2003
  • 2003-10-28 US US10/527,021 patent/US7104284B2/en not_active Expired - Lifetime
  • 2003-10-28 EP EP03780237A patent/EP1556618B1/de not_active Expired - Lifetime
  • 2003-10-28 WO PCT/FR2003/003209 patent/WO2004042236A1/fr active IP Right Grant
  • 2003-10-28 AU AU2003288333A patent/AU2003288333A1/en not_active Abandoned
  • 2003-10-28 JP JP2004549263A patent/JP4686190B2/ja not_active Expired - Fee Related
  • 2003-10-28 AT AT03780237T patent/ATE346243T1/de not_active IP Right Cessation
  • 2003-10-28 DE DE2003609916 patent/DE60309916T2/de not_active Expired - Lifetime

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events