WO2003042550A1 - Cylindre de blocage automatique et dispositif renseignant sur l'etat dudit cylindre - Google Patents

Cylindre de blocage automatique et dispositif renseignant sur l'etat dudit cylindre Download PDF

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Publication number
WO2003042550A1
WO2003042550A1 PCT/SE2002/001841 SE0201841W WO03042550A1 WO 2003042550 A1 WO2003042550 A1 WO 2003042550A1 SE 0201841 W SE0201841 W SE 0201841W WO 03042550 A1 WO03042550 A1 WO 03042550A1
Authority
WO
WIPO (PCT)
Prior art keywords
locking
balls
lock cylinder
piston rod
taper
Prior art date
Application number
PCT/SE2002/001841
Other languages
English (en)
Inventor
Lars Wallin
Original Assignee
Hydrotech Construction Company Ab
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 Hydrotech Construction Company Ab filed Critical Hydrotech Construction Company Ab
Publication of WO2003042550A1 publication Critical patent/WO2003042550A1/fr

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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
    • F15B15/26—Locking mechanisms
    • F15B15/261—Locking mechanisms using positive interengagement, e.g. balls and grooves, for locking in the end positions

Definitions

  • the present invention refers to a self-acting lock cylinder according to the preamble of the accompanying claim 1, and to a device for indicating the condition of the lock cylinder.
  • the function can be of use where ever a linear motor is used and at some applications, instead of a hydraulic lock, it is required a lock with a mechanical locking function and a demand for a mechanically locked linear motor can be found i.a. onboard on ships to batten down hatches, bow screens and stern ramps. Demands from different classification societies will also add to the picture and raise demands for function and tests.
  • patent NO 305140 is described a pressure fluid operated control cylinder of this type, which has a locking ring which is movable with the piston head in the longitudinal direction of the cylinder and which is restrictedly movable along the piston rod, and where in the cylinder is provided at least one stationary locking mechanism situated adjacent anyone of the external positions of the piston rod, which locking mechanism has a radially inwardly movable first locking member in the shape of balls guided in a retainer, and which are arranged to be guided inwardly by the locking ring to a locking engagement in cooperation with a second locking member formed as an annular groove in the piston rod, and to retain the first locking member in locking position in the second locking member, the locking effect of which can not be neutralized until pressure medium is supplied.
  • a drawback at this earlier known design is, that the balls acting as the first locking member, will cooperate with a groove in the piston rod and at full load or at pressure shocks, which sometimes occur at the piston rod of such a control cylinder, there is a clear risk that the balls may be deformed and/or cause damage to the contact surfaces in the grooves of the piston rod, whereby the service life for the design will be limited.
  • the purpose of the present invention is to provide a self-acting lock of this type, which is also operating with radially movable balls as locking members, but which can stand being subjected to full load in its locked position, whereby the balls neither are subjected to load in the longitudinal direction of the lock nor otherwise are causing problems, which earlier designs have suffered from and this has been achieved in that the lock cylinder has been given the features, which are defined in the accompanying claims 1-5.
  • the invention is also incorporating a device for indicating the instantaneous condition of the lock and this device is defined by the contents of claim 6.
  • Fig. 1 shows in a side view a lock cylinder according to the invention in a longitudinal cross section, and with the piston rod in its most pushed in position.
  • Fig. 2 is a corresponding cross sectional view with the piston rod in its most pushed out and locked position.
  • Fig. 3 and Fig. 4 show in bigger scale and in planar views and cross section a position indicating device, which can form part of the lock cylinder.
  • Fig. 5 is an alternative embodiment of a lock cylinder according to the invention, shown in a section corresponding to Fig. 1, and
  • Frig. 6 is a portion of the lock cylinder according to Fig. 5 in bigger scale.
  • Fig. 1 is shown in an axial cross section a locking piston 1 with a substantially tubular housing 2, which at a first end is equipped with an end cover 3 having a through-opening 4, and at its opposite, second end with another end cover 5, with an internal, cylindric cavity 6.
  • the second end cover 5 is provided with an articulated attachment means 7 facing away from the housing 2 and intended for attachment of the hydraulic cylinder to any cooperating structure.
  • the second end cover 5 is furthermore provided with a channel 8, in the embodiment shown extending radially, which extends from the outer side of the end cover and opens in the cylindric cavity 6.
  • the second end cover 5 is attached to the housing 2 by means of a lock nut 9.
  • a sleeve 10 which by means of a shoulder rests against an axially projecting flange on the first end cover 3 and which is coaxial to the housing and has a bigger inner diameter.
  • the first end cover 3 and the sleeve 10 are attached to the housing 2 by means of a further lock nut 9.
  • the sleeve 10 is equipped with a radially extending channel 11, which extends from the outer side of the sleeve and opens in the interior of the sleeve.
  • the sleeve 10 is also provided with a circumferentially extending groove 12 extending along the inner envelope surface and intended to act as a part of a locking mechanism.
  • an approach taper 12a which is also forming part of the locking mechanism, and which preceds a passage 12b having a smaller cross sectional area.
  • a piston rod 13 projects through the opening 4 in the first end cover 3, and it is axially displaceable through the opening and sealed off by means of conventional seals.
  • the piston rod 13 supports a piston 14, which under sealing contact against the inner side of the sleeve 10 and under influence of a pressure medium, e.g. a hydraulic pressure, is axially displaceable in the housing.
  • the piston 14 is preloaded in axial direction toward the piston rod 13 by means of a spring 15, which in the embodiment illustrated is arranged about the piston rod, which spring is arranged between the piston and a spring retainer 16 firmly affixed to the piston rod.
  • the present invention solves the problem at a lock for a linear motor by means of a mechanical lock, which is arranged within the linear motor at the position where it is desired that the linear motor shall retain the load and be locked. Contrary to the earlier described hydraulic locking, the invention needs a pressure for unlocking and it is thus without pressure in its locked position.
  • the lock according to the invention can manage to be subjected to full load in its locked function as the piston always engages the cylinder gable, whereby the balls are not subjected to load in linear direction. Furthermore the balls are neither running against the cylinder walls nor against the piston rod and are therefore not subjecting the seals to wear and no mechanical wear to the structure.
  • a ring Coaxially to the piston rod 13 and in front of the piston 14 is provided a ring, which is carried along by the piston and is arranged around the piston rod, and which acts as a ball retainer 17 and is provided with a number of circular holes in each of which is positioned a ball 18.
  • an annular taper 19 which by means of a spring 20 is preloaded in a direction away from the piston.
  • a channel extends through a portion of the piston rod 13, in which channel is insertable a cable 21, which extends through a non-conductive sleeve 22 fitted in the second end cover 5.
  • the device incorporates a movable contact member 23, which is arranged to move on the sleeve 22 and is in contact with the piston (14 in Fig. 2).
  • the sleeve 22 supports a conductive top cap 24, which via the cable 21 is in contact with a cable connection 30.
  • a conductive bottom cap 25 which is equipped with a bottom cap cable 26, which can be brought in contact with a ground cable 27 connected to ground 28, and which is connected to the bottom cap 25, via a non-conductive intermediate member 29.
  • a number of cables 30 are connected to the area of the ground cable 27 and the bottom cap cable 26.
  • the sleeve is manufactured from an electrically non-conductive material and has a length which corresponds to the length of the stroke of the linear motor. Due to the fact that the piston rod is insulated by means of a sealing system it is possible to establish contact only when the piston and the contact of the piston meet any one of the contact plates and reaches one of the gables, whereupon the contact then emits a signal via ground.
  • the sensor can also be fitted thus that a series coupling is possible, i.e. when several applications are mounted for operating together, it is possible easily to find a malfunctioning application in the array of cylinders and/or similar equipment, by means of a series coupling.
  • This part of the invention can be applied on linear motors of all dimensions, and it is not limited to application only at the end positions of the linear motor, but on the whole it can be applied at any position along the length of stroke of the linear motor.
  • the function for the selfacting locking cylinder according to the invention is the following.
  • Fig. 5 is shown an alternative embodiment of the lock cylinder according to the invention, and in order to simplify the understanding of this variant of the lock cylinder, components having the same or similar function as in the embodiment according to Fig. 1 have been given the same reference numerals as in Figs. 1-4.
  • the invention has been illustrated in connection with specific embodiments wherein arresting of the piston rod is automatically effected at the most ejected position of the piston rod, but it is understood, that the same effect can be achieved by means of a reversal of the mechanism, thus that a locking can be obtained in the most retracted position of the piston rod, and also at other positions along the length of stroke for the cylinder.
  • the invention is neither limited in other respects to the embodiments shown in the drawings and described in connection thereto, but amendments and variants are possible within the scope of the accompanying claims.

Landscapes

  • Actuator (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)

Abstract

Cette invention concerne un cylindre de blocage automatique (1), intégré à un moteur linéaire, comprenant un piston qui se déplace dans le sens longitudinal du cylindre en même temps qu'une tige de piston (13). Le cylindre est muni d'au moins un mécanisme de blocage disposé au niveau de l'une quelconque des positions extérieures de la tige de piston (13). Ce mécanisme de blocage comporte au moins un premier élément de verrouillage à déplacement radial se présentant sous la forme de billes (18) insérées dans une pièce de retenue (17). un mécanisme qui se déplace dans une mesure limitée avec la tige de piston assure le guidage desdites billes sur une position de verrouillage en collaboration avec un second élément de verrouillage ces billes maintenant le premier élément de verrouillage verrouillé dans le second élément de verrouillage. Pour que l'effet de verrouillage cesse, il faut une alimentation en liquide sous pression. Le second élément de verrouillage est constitué par une gorge de verrouillage (12) disposée à l'écart de la tige de piston (13) à une certaine distance radiale de cette dernière.
PCT/SE2002/001841 2001-10-10 2002-10-08 Cylindre de blocage automatique et dispositif renseignant sur l'etat dudit cylindre WO2003042550A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0103380-2 2001-10-10
SE0103380A SE0103380D0 (sv) 2001-10-10 2001-10-10 Självverkande låscylinder och anordning för indikering av låscylinderns tillstånd

Publications (1)

Publication Number Publication Date
WO2003042550A1 true WO2003042550A1 (fr) 2003-05-22

Family

ID=20285608

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2002/001841 WO2003042550A1 (fr) 2001-10-10 2002-10-08 Cylindre de blocage automatique et dispositif renseignant sur l'etat dudit cylindre

Country Status (2)

Country Link
SE (1) SE0103380D0 (fr)
WO (1) WO2003042550A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1544499A1 (fr) * 2003-12-16 2005-06-22 AL-KO Kober AG Amortisseur avec bague de butée
WO2008052884A1 (fr) * 2006-11-03 2008-05-08 Schaeffler Kg Dispositif de réglage
CN102611245A (zh) * 2010-12-31 2012-07-25 通用电气公司 线性促动器及其运行方法
CN102817882A (zh) * 2012-09-14 2012-12-12 泸州市巨力液压有限公司 单一位移锁紧油缸
WO2015200231A1 (fr) * 2014-06-25 2015-12-30 Abel Leo William Mécanisme de verrouillage à indication d'état visible
CN109268342A (zh) * 2018-11-23 2019-01-25 北京精密机电控制设备研究所 一种具有两端钢珠机械锁的作动筒

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2128680A (en) * 1982-10-08 1984-05-02 Johnston Brothers Hydraulic cylinder and piston
US4635536A (en) * 1983-09-19 1987-01-13 Miller Fluid Power Corporation Cylinder locking apparatus
US4703683A (en) * 1985-02-04 1987-11-03 Grumman Aerospace Corporation Fluid actuator with internal locking

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2128680A (en) * 1982-10-08 1984-05-02 Johnston Brothers Hydraulic cylinder and piston
US4635536A (en) * 1983-09-19 1987-01-13 Miller Fluid Power Corporation Cylinder locking apparatus
US4703683A (en) * 1985-02-04 1987-11-03 Grumman Aerospace Corporation Fluid actuator with internal locking

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1544499A1 (fr) * 2003-12-16 2005-06-22 AL-KO Kober AG Amortisseur avec bague de butée
WO2008052884A1 (fr) * 2006-11-03 2008-05-08 Schaeffler Kg Dispositif de réglage
CN102611245A (zh) * 2010-12-31 2012-07-25 通用电气公司 线性促动器及其运行方法
CN102817882A (zh) * 2012-09-14 2012-12-12 泸州市巨力液压有限公司 单一位移锁紧油缸
WO2015200231A1 (fr) * 2014-06-25 2015-12-30 Abel Leo William Mécanisme de verrouillage à indication d'état visible
US9416894B2 (en) 2014-06-25 2016-08-16 Leo William Abel Locking mechanism with visible status indication
CN109268342A (zh) * 2018-11-23 2019-01-25 北京精密机电控制设备研究所 一种具有两端钢珠机械锁的作动筒

Also Published As

Publication number Publication date
SE0103380D0 (sv) 2001-10-10

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