EP0024276A1 - Stellmotor - Google Patents

Stellmotor Download PDF

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Publication number
EP0024276A1
EP0024276A1 EP79301648A EP79301648A EP0024276A1 EP 0024276 A1 EP0024276 A1 EP 0024276A1 EP 79301648 A EP79301648 A EP 79301648A EP 79301648 A EP79301648 A EP 79301648A EP 0024276 A1 EP0024276 A1 EP 0024276A1
Authority
EP
European Patent Office
Prior art keywords
piston
piston rod
pivot point
pin
disc
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.)
Granted
Application number
EP79301648A
Other languages
English (en)
French (fr)
Other versions
EP0024276B1 (de
Inventor
Roger Keith Taylor
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TOURDELOS Ltd
Original Assignee
TOURDELOS Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by TOURDELOS Ltd filed Critical TOURDELOS Ltd
Priority to AT79301648T priority Critical patent/ATE8694T1/de
Priority to DE7979301648T priority patent/DE2967132D1/de
Priority to EP79301648A priority patent/EP0024276B1/de
Publication of EP0024276A1 publication Critical patent/EP0024276A1/de
Application granted granted Critical
Publication of EP0024276B1 publication Critical patent/EP0024276B1/de
Expired legal-status Critical Current

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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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/204—Control means for piston speed or actuating force without external control, e.g. control valve inside the piston
    • 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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/02—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member

Definitions

  • the present invention relates to an actuator for operation by fluid pressure.
  • an actuator comprising a cylinder within which are a piston, a piston rod, and a mechanical linkage arranged to transmit axial movement of the piston to the piston rod at a relative speed which decreases as the piston nears the end of its travel towards the piston rod, the linkage including a rigid member pivoted to the piston rod at a first pivot point, a link pivoted at one end to the member at a second pivot point and pivoted at its other end to the piston, a pin supported in the cylinder at an axial position intermediate the piston and the piston rod end of the cylinder for transverse sliding movement and pivoted to or pivotally engageable with the member at a third pivot point, the arrangement being such that when the piston is at the far end of its travel from the piston rod the second and third pivot points are both on one side of the piston axis and as the piston moves towards the piston rod the second pivot point moves to the other side of the piston axis.
  • the second pivot point is nearer the piston axis than the third pivot point when the piston is at
  • the rigid member comprises a disc rotatably mounted in a bearing formed in the end of the piston rod, the axis of the bearing being the first pivot point, an arm extending radially from the disc to one side of its axis and carrying the second pivot point and an aperture eccentrically positioned in the disc to the other side of its axis pivotally engaging or being pivotally engageable with the pin at the third pivot point.
  • the pin is releaseably engageable with the disc at the third pivot point, the end of the piston rod carrying the disc moving axially towards or away from the pin as the piston moves, and the pin entering into engagement with the disc as the disc approaches the end of the pin.
  • the actuator shown in the drawings employs a toggle mechanism arranged to vary the force amplification throughout the stroke so that near the end of the working stroke when the piston nears the bottom of the cylinder the force amplification is large, whereas during the first part of the working stroke the force amplification is small or even negative.
  • Such an actuator has application to, for example, a punch in which the upper part of the stroke is required only for the purpose of giving clearance to a workpiece to be inserted in and removed from the dies.
  • a piston 1 is slidable in a cylinder 2 having a lower end block 3 slidably supporting a piston rod 7.
  • the upper end 8 of the piston rod is flattened and of less thickness than the rod diameter. It includes a bearing whose pivot axis is slightly offset to one side of the axis of the piston rod and a downwardly directed nose 9 on said one side bounding a slot in a lower portion of said bearing. The presence of the offset enables the actuator to give increased power and provide some compensation for side loads on the bearing.
  • the tip of the nose is bevelled to provide a lead-in 10 and its inner face forms a slideway 11 for guiding a pin 23 through the slot in the bearing.
  • a disc 14 pivots in the bearing and has a recess 15 opening to its edge. Overlying the disc 14 and secured to either side thereof are link plates 16 and 16a also formed with recesses corresponding to part of the slideway 11 and recess 15. The ends of the link plates 16 and 16a remote from the recesses are provided with pivot holes. One end of a link member 17 is pivoted to the link plates by means of a pivot pin 18 and the other end thereof is pivoted to the piston 1 by means of a pivot pin 19.
  • the lower end block 3 has a vertical slot terminating in a vertical end wall 20 and bounded by side walls 21 and 22.
  • the piston rod 7 and link plates 16 and 16a can move axially in the slot, planar surfaces 23 on the link plates sliding over the upper portion of end wall 20 when the piston is towards the top of its stroke.
  • Formed in side walls 21 and 22 adjacent end wall 20 at an axial position appropriately spaced from the base of the end block 3 are transversely extending slideways which slidably support a pin 23 mounted at its ends on respective trunnion blocks 24 and 25.
  • Figure 4 shows the trunnion block 24 in its slideway 26, the pin 23 being retained by means of circlip 27.
  • movement of the pin 23 need not be strictly at right angles to the axis of the piston. If the slideway 26 is inclined upwards at an angle to the axis of the piston 1, there is a counteracting movement between the piston and the pin which may be advantageous in some applications.
  • the actuator may be caused to lock at the end of the working stroke either by means of an over-centre action or by mechanical action. When the line between the centre of the pin 23 and the centre of the bearing moves across a plane parallel to the piston axis, the piston rod is, of course, locked by an over-centre action. It has, however, been found with reference to the present actuator that, provided that the angle between said line and said plane is less than approximately 10 degrees, friction will lock the piston rod notwithstanding that an over-centre action does not quite take place.
  • the apparatus described above is a further development of that described in the Applicant's earlier British Patent Specification No. 1,401,963 and is of inherently stronger construction.
  • the releaseable pin 23 engages with the bearing more reliably than the apparatus shown in Figure 2 of the said specification and because of the release feature the present apparatus is not limited to a relatively short working stroke as in the apparatus shown in Figure 3 of the said specification. If, however, only a relatively short working stroke is required the slotted construction of the top of the piston rod may be replaced by a continuous eye with appropriate modification to the shape of the link plates.
  • actuator described herein is primarily intended for pneumatic use, it will be appreciated that the invention also has application to hydraulic actuators, particularly those intended for use at comparatively low hydraulic pressures.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Valve Device For Special Equipments (AREA)
  • Fluid-Driven Valves (AREA)
EP79301648A 1979-08-14 1979-08-14 Stellmotor Expired EP0024276B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AT79301648T ATE8694T1 (de) 1979-08-14 1979-08-14 Stellmotor.
DE7979301648T DE2967132D1 (en) 1979-08-14 1979-08-14 Actuator
EP79301648A EP0024276B1 (de) 1979-08-14 1979-08-14 Stellmotor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP79301648A EP0024276B1 (de) 1979-08-14 1979-08-14 Stellmotor

Publications (2)

Publication Number Publication Date
EP0024276A1 true EP0024276A1 (de) 1981-03-04
EP0024276B1 EP0024276B1 (de) 1984-07-25

Family

ID=8186418

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79301648A Expired EP0024276B1 (de) 1979-08-14 1979-08-14 Stellmotor

Country Status (3)

Country Link
EP (1) EP0024276B1 (de)
AT (1) ATE8694T1 (de)
DE (1) DE2967132D1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2640904A1 (de) * 1988-12-23 1990-06-29 Utica Ets Inc
EP0562503A1 (de) * 1992-03-24 1993-09-29 Franz Kirsching Pneumatikzylinder
AU701696B1 (en) * 1997-10-15 1999-02-04 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Structure for supporting fluid pressure cylinders used to control pivoting of vehicle axles
GB2538452B (en) * 2014-03-12 2020-04-01 Vistadeltek Llc Multiflex coupling

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2253732A1 (de) * 1971-11-02 1973-05-10 John Henry Brems Kraftuebertragungs- und verstaerkungssystem
GB1401963A (en) * 1971-07-05 1975-08-06 Tourdelos Ltd Actuators

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1401963A (en) * 1971-07-05 1975-08-06 Tourdelos Ltd Actuators
DE2253732A1 (de) * 1971-11-02 1973-05-10 John Henry Brems Kraftuebertragungs- und verstaerkungssystem

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2640904A1 (de) * 1988-12-23 1990-06-29 Utica Ets Inc
EP0562503A1 (de) * 1992-03-24 1993-09-29 Franz Kirsching Pneumatikzylinder
AU701696B1 (en) * 1997-10-15 1999-02-04 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Structure for supporting fluid pressure cylinders used to control pivoting of vehicle axles
GB2538452B (en) * 2014-03-12 2020-04-01 Vistadeltek Llc Multiflex coupling

Also Published As

Publication number Publication date
ATE8694T1 (de) 1984-08-15
EP0024276B1 (de) 1984-07-25
DE2967132D1 (en) 1984-08-30

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