US3745619A - Locking devices - Google Patents

Locking devices Download PDF

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Publication number
US3745619A
US3745619A US00179766A US3745619DA US3745619A US 3745619 A US3745619 A US 3745619A US 00179766 A US00179766 A US 00179766A US 3745619D A US3745619D A US 3745619DA US 3745619 A US3745619 A US 3745619A
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US
United States
Prior art keywords
locking
toggle
hydraulically operated
toggle joint
machine tool
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00179766A
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English (en)
Inventor
R Guilleray
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HURE
Original Assignee
HURE
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Filing date
Publication date
Application filed by HURE filed Critical HURE
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Publication of US3745619A publication Critical patent/US3745619A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
    • B23Q1/25—Movable or adjustable work or tool supports
    • B23Q1/26—Movable or adjustable work or tool supports characterised by constructional features relating to the co-operation of relatively movable members; Means for preventing relative movement of such members
    • B23Q1/28—Means for securing sliding members in any desired position
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
    • B23B31/02—Chucks
    • B23B31/24—Chucks characterised by features relating primarily to remote control of the gripping means
    • B23B31/30—Chucks characterised by features relating primarily to remote control of the gripping means using fluid-pressure means in the chuck
    • B23B31/302—Hydraulic equipment, e.g. pistons, valves, rotary joints
    • 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
    • Y10T409/00—Gear cutting, milling, or planing
    • Y10T409/30—Milling

Definitions

  • ABSTRACT The invention is concerned with providing a hydraulically operated device for locking two relatively movable parts together in a manner which is not disturbed by loss of hydraulic pressure due to failure or shutdown of the machine, the device comprising a togglejoint which is driven over and back across the dead point by hydraulic pressures, a small section of the movement of the toggle ends being used to take up the play for clamping and the remainder of the movement being used to compress an energy storage device to provide sustained clamping forces.
  • the invention relates to a locking device intended to secure the different sections of a machine tool into a relative pre-determined position for a long period of time.
  • a hydraulic locking device of the conventional type is not suitable as the pressure must be maintained while the operation is stopped which necessitates, for example, the functioning of a compressor while the operation is stopped.
  • the moving parts do not retain their respective positions.
  • the aim of the invention is to provide a locking device for a machine-tool which makes it possible to obtain a strong and lasting locking.
  • a locking device comprises a hydraulic device acting on a toggle-joint (knuckle-joint) which can go over a dead point, a small section of the toggle-joint serving to take up the play between the sections to be locked, the remainder of the stroke serving to compress a device for storing energy.
  • the body of the device is fixed on one of the sections to be locked and the aforementioned moving part bears against a locking part coming into contact with the second part to be locked.
  • the body is secured, in a sliding manner, onto one of the sections to be locked and is integral with the second part to be locked and the said moving part is in abutment against the first part to be locked.
  • one of the ends of the toggle-joint is lodged in the body of the device and the other bears against a part forming a push rod acting on a moving part through the intermediary of one or several Belleville (dished) spring washers.
  • FIG. 1 shows a sectional view of a locking device according to the invention
  • FIG. 2 shows a locking system operated using the device of FIG. 1,
  • FIG. 3 shows a locking system by traction using the device of FIG. 1 and
  • FIG. 4 shows a safety device
  • the device described in FIG. 1 comprises a housing 2 in which a mechanism for the toggle-joint 3 is located, the toggle-joint comprising two levers 4 and 5 pivoted with respect to each other about an axis 6.
  • the two ends of the toggle-joint 3 have a rounded shape; one of these ends, referred to at 7, is located in a housing corresponding to the housing 2, and the other end, referred to at 8, is located in a circular socket arranged in the part 9, which part 9 forms a push rod and slides in the housing 2.
  • the toggle-joint 3 is actuated by means of a cylindrical piston which is displaced in a cylinder 13 and in the axis of which there is arranged a recess 10 in which the by pressure toggle-joint 3 can be moved.
  • This recess 10 is defined, by two sections 11 and 12 of the piston which are V- shaped, in such a manner that the piston is always in contact with the axis 6 of the togglejoint.
  • the housing 2 comprises two inlets l4 and 15 for fluid, making it possible to apply a hydraulic pressure onto one or other of the external faces of the piston.
  • the stroke of the piston is such that the toggle-joint can pass from an open position shown in FIG. 1 and diagrammatically in 3' in FIG. 4, into a locking position shown diagrammatically in 3" in FIG. 4 in which the toggle-joint has just exceeded the dead point.
  • the part 9 forming the push rod comprises a cylindrical bore arranged at the bottom of the socket of the lever 5 and in which is located a close-coil spring 16 urging together the parts 4, 5 and 6 of the toggle-joint 3 in the released position, i.e., in the open position.
  • This push-rod 9 acts on a moving part 17 by the intermediary of a device for storing energy operating under the pressure advantageously constituted by several Belleville washers 18.
  • the opening is attained by applying a pressure at the aperture 15. Then the piston bears against the axis 6 in such a manner as to cause the toggle-joint to pass over the dead point and to return to the open position shown in FIG. 1.
  • FIG. 2 shows a system for locking the table of a milling machine on its bracket.
  • the housing 2 of the device of FIG. 1 is fixed, for example by screwing onto the bracket 21.
  • the moving piece 17 acts on the end of a sliding rod 22, the other end of which is integral with a wedge-shaped part 23 which can come into contact with a corresponding face 24 of the plate 25.
  • the play between the part 23 and face 24 corresponds to a small section of the stroke of the push-rod 9. For example, this play is equal to 0.1 mm whereas the stroke of the push-rod 9 is 1 mm.
  • 9/10 of the stroke of the push-rod 9 serve to compress the Belleville washers 18 and thus to create a locking pressure.
  • a locking force of about two metric tons can be attained by using a drivinghydraulic pressure of about 47 bars.
  • FIG. 3 shows a locking system for the ram of a milling machine with respect to its frame.
  • the housing 2 of the device of FIG. 1 is mounted forsliding motion in the frame 31, the housing 2 is integral with an intermediate part 32 fixed at one end of a moving rod 33 the other end of which is integral with the ram 34 by the intermediary of a locking part 35.
  • the latter has a shoulder 36 which may come into locking contact with a part 37 of the frame.
  • cylindrical parts 38 are located in free sliding motion. These cylindrical parts 38 are distributed regularly around a circle on the part 32; they can for example be in the number of three and located at One of the ends of the parts 38 is in contact with the moving part 17 and the other is in contact with the frame 31, preferably by the intermediary of a wide washer 39 to prevent the deformation of the bed of the frame, which is not resistant enough.
  • the locking is brought about not by pressure but by traction. Indeed, when the push-rod 9 bears against the moving part 17, the whole of the body 2 slides onto the frame while pulling the part 36 which comes into contact with the part 37. When the part 36 is taken up the play which existed, for example 0.1 mm, the remainder of the stroke of the push rod 9 is absorbed by the Belleville washers l8 and that creates the locking force.
  • the locking device moreover has the following advantages.
  • the toggle-joint having a low clearance angle makes it possible to magnify the locking force enabling the driving hydraulic force to be small in size in the system which, of course, may sometimes be extensive when installed in complex or multiple machines.
  • the locking device according to the invention comprises a safety device preventing all driving movement of the locked parts until the opening has taken place.
  • This safety device can be constituted by an electric switch of the microswitch type, preventing all driving movement when the device according to the invention is in a locked postion.
  • the moving part 41 of this electric switch 42 is integral with the free end of the lever 4 of the toggle-joint in such a manner as to be turned with the latter.
  • a hydraulically operated device for locking a movable part of a machine tool with respect to a relatively fixed part thereof comprising:
  • a toggle joint arranged between said relatively movable pans of said machine tool and movable on either side of a dead point between a first position near thereto wherein said movable part is loaded with a high clamping force and thereby locked on said fixed part and a second position relatively spaced from the dead point wherein said movable part is released and capable of moving with respect to said fixed part, and,
  • a hydraulic actuating device for moving said toggle joint between said first and second positions, said device comprising a double acting piston having two axially spaced annular sections sealingly slidable within a cylinder to define therein two variable volume chambers, respectively, a recess being provided between said sections for receiving the main portion of said toggle joint and for actuating same from one to the other of said positions depending upon one or the other of said variable volume chambers being connected to a fluid pressure source or to a reservoir, respectively.
  • a hydraulically operated device according to claim 1, wherein an energy storing device is arranged in series relationship with said toggle joint between said fixed and movable parts of the machine tool.
  • a hydraulically operated device wherein said energy storing device is comprised of a stack of resilient dished washers.
  • a hydraulically operated device wherein said toggle joint is comprised of two levers pivotally connected to a coupling member arranged therebetween with one of said levers pivotally abutting a radial recess in said cylinder, the other lever being connected to said movable part of the machine tool.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Crushing And Grinding (AREA)
  • Clamps And Clips (AREA)
  • Accommodation For Nursing Or Treatment Tables (AREA)
US00179766A 1970-09-15 1971-09-13 Locking devices Expired - Lifetime US3745619A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7033421A FR2105632A5 (sv) 1970-09-15 1970-09-15

Publications (1)

Publication Number Publication Date
US3745619A true US3745619A (en) 1973-07-17

Family

ID=9061328

Family Applications (1)

Application Number Title Priority Date Filing Date
US00179766A Expired - Lifetime US3745619A (en) 1970-09-15 1971-09-13 Locking devices

Country Status (5)

Country Link
US (1) US3745619A (sv)
DE (1) DE2145643C3 (sv)
FR (1) FR2105632A5 (sv)
IT (1) IT940355B (sv)
SE (1) SE378371B (sv)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4188142A (en) * 1977-11-09 1980-02-12 Olsson Hans O Lockable swivel coupling
DE3268446D1 (en) * 1982-04-01 1986-02-20 Sta Co Mettallerzeugnisse Gmbh Fluid-pressure actuator
DE3233940C1 (de) * 1982-09-13 1984-03-22 Optima-Spanntechnik GmbH, 5900 Siegen Schnellspannvorrichtung

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2049842A (en) * 1934-04-16 1936-08-04 Fred E Kling Rolling mill
US2955347A (en) * 1956-07-09 1960-10-11 Buhr Machine Tool Company Pallet clamp construction

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2049842A (en) * 1934-04-16 1936-08-04 Fred E Kling Rolling mill
US2955347A (en) * 1956-07-09 1960-10-11 Buhr Machine Tool Company Pallet clamp construction

Also Published As

Publication number Publication date
FR2105632A5 (sv) 1972-04-28
DE2145643A1 (de) 1973-03-29
SE378371B (sv) 1975-09-01
DE2145643C3 (de) 1974-02-07
DE2145643B2 (de) 1973-07-12
IT940355B (it) 1973-02-10

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