WO2000063590A1 - Actuator - Google Patents
Actuator Download PDFInfo
- Publication number
- WO2000063590A1 WO2000063590A1 PCT/DK2000/000185 DK0000185W WO0063590A1 WO 2000063590 A1 WO2000063590 A1 WO 2000063590A1 DK 0000185 W DK0000185 W DK 0000185W WO 0063590 A1 WO0063590 A1 WO 0063590A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- bushing
- spindle
- actuator
- pin
- housing
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
- F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
- F16H25/20—Screw mechanisms
- F16H25/2015—Means specially adapted for stopping actuators in the end position; Position sensing means
Definitions
- the present invention concerns an actuator as described in the preamble of claim 1.
- actuators there is the problem that the bushing at the end of its travel abuts on a surface in one of the tubes and thereby may be wedged. Hereby a further activation for moving in the opposite direction may be impeded or even made impossible.
- the actuators are provided with end stops which may be designed in various ways.
- actuators of the kind mentioned in the introduction with end stops which are furnished as sensors disposed at the outside of the tubes and which interact with magnets provided on the bushing. These end stops may be movable and disposed apart from the ends of the outer tube. As the sensors register the presence of the magnet, a signal is transmitted to the actuator motor which is deactivated. Hereby the continuous rotation of the spindle is stopped and engagement of the end surfaces is prevented.
- This actuator is, however, relatively expensive, and there will be a risk of failure if persons unintendedly bump on the sensors so that they are displaced and thereby give off signal at the wrong time.
- Actuators are also known where attempts have been made to prevent wedging by providing the bushing with a rubber sleeve for abutting on end faces in the tubes.
- a rubber sleeve will not prevent the wedging, but only reduces the force to be overcome by activation for movement in the opposite direction.
- a motor that may yield sufficient large force to overcome the wedging, and which hence becomes unnecessarily expensive.
- a wedging may still be so effective that movement in opposite direction is impossible.
- actuators are relatively complicated and therefore expensive as well as there is a risk of faulty performance in the many interacting elements.
- actuators that are reliable and also inexpensive. For example, this is a need in various equipment for aiding the handicapped, such as wheel chairs with swivelling or pivotable seats and backs, and in beds with mutually pivotable sections to facilitate alighting and entering, and for making the bed comfortable for the user.
- the flange also has sloping lateral faces forming an angle between 15 and
- the pitch angle for the thread is less than the angle of the sloping lateral faces as measured relative to a plane perpendicular to the centre axis of the spindle.
- the first tube is constituted by the outer tube and the second tube of the inner tube.
- the actuator it is within the possibilities of the skilled in the art to design the actuator within the scope of the invention so that the first tube is constituted by the inner tube and the second tube simultaneously is constituted by the outer tube.
- the end stop comprises stop means on the spindle and stop means on the bushing interacting by mutual impact, whereby the bushing overcomes the friction with the bushing housing and thereby can rotate together with the spindle by a continuous rotation of this.
- the actuator is technically very simple as it only comprises the three interacting elements spindle, bushing and bushing housing for establishing the end stops. These elements are designed with geometrical shapes ensuring the correct functioning. These geometrical shapes may be calculated in simple ways from common algorithms for determining frictional connections and screw connections. From these algorithms moments may be determined so that for given loads of the actuator and for given dimensions of elements of the actuator there will always be a greater moment for the bushing (the slip coupling) than for the spindle.
- the actuator is made in a particularly simple way in that the stop means of the spindle comprise a pin mounted in a radially extending boring and projecting outside the thread, and in that the stop means of the bushing comprises a pin mounted in an axially extending boring and projecting from the bushing in a radial position which makes possible engagement with the pin of the spindle.
- the stop means of the bushing may comprise an axially extending surface provided in a recess which is formed in an end face of the bushing and which has a radial extension allowing the pin of the spindle to protrude into the recess by rotation of the spindle.
- This recess may be formed as a boring in parallel with the centre axis for the spindle or as a helical recess which is ended with a radially extending side wall.
- the stop means of the spindle comprise a pin mounted in an axially extending boring in a flange projecting from the spindle
- the stop means of the bushing comprise a pin mounted in an axially extending boring and projecting from the bushing in a radial position making possible engagement with the pin of the spindle.
- This embodiment is particularly suitable for spindles with small diame- ter and consequently small amount of material in which a boring for the pin may be formed. In such a spindle there is risk of weakening the material by boring in the spindle.
- the bushing housing is preferably provided in two parts between which the recess is formed for accommodating the flange on the bushing, and that the two parts of the bushing housing are screwed together around the flange by means of a screw connection.
- the bushing housing is screwed fast at the end of the inner tube.
- Fig. 1 shows a partial, longitudinal section through a part of a first embodiment of an actuator according to the invention
- Fig. 2 shows a section corresponding to Fig. 1 for illustrating a second embodiment of the actuator according to the invention
- Fig. 3 is a partial perspective view of a bushing for a further embodiment of an actuator according to the invention
- Fig. 4 is a view corresponding to Fig. 3 for illustrating a further embodiment.
- Fig. 1 there is illustrated a part of an actuator 1 which illustrates the connection between a spindle 2 and a bushing 8.
- the spindle 2 is connected with a motor 4 which is stationary and fastened to an outer tube 5.
- the motor provides the rotation of the spindle.
- the spindle 2 is provided with a thread 6 engaging a thread 7 in the bushing 8.
- the bushing 8 is mounted rotatable in a bushing housing 9 which via a screw connection 10 is fastened to an inner tube 11.
- the housing 9 is made of a first part 12 and a second part 13 which are mutually connected via a screw connection 14.
- the housing is made with an annular recess 15 having sloping lateral faces 16 which are arranged under an angle 17 of about 45° in relation to a plane 18 perpendicular to the centre axis 19 of the spindle.
- the bushing 8 is mainly cylindrical and has a flange 20 facing outward from the cylindrical surface 21 and which is received rotatable in the recess 15. After mounting the bushing housing 9 in the outer tube, this is closed with a scraper ring 3.
- the outer tube and the inner tube are connected with the elements to be imparted a mutual displacement by means of the actuator.
- the tubes 5,11 will thus not rotate when the actuator is used.
- stop means in the shape of a pin 22 mounted in an axially extending boring 23 in a first end face 24.
- This pin 22 is placed in a radial position just outside the upper side 25 of the thread 6 of the spindle.
- a radially extending boring in which there is mounted a pin 27 the outer end of which extends beyond the upper side of the spindle thread to a radial position where it may engage the pin 22 when the bushing reaches one of its extreme positions.
- a pin 28 is disposed in an axially extending boring in a flange 29 which is rotationally connected with the spindle 2.
- the pin 28 is placed for interacting with a pin 30 mounted in an axially extending boring 31 in a second end face 32 of the bushing 8.
- the pins are retained in the boring via an interference fit, via screw connection, via welding or in another way.
- the actuator 1 ' shown in Fig. 2 differs from the one in Fig. 1 by different stop means at the outer end 26 of the spindle 2.
- a flange 33 provided with an axially extending boring in which there is mounted a pin 34 intended for engaging the pin 22 in the bushing 8.
- a bushing 8' which instead of a pin has an stop face formed by the side wall 35 in a recess in the shape of an axially extending boring 36 in the end face 24 or 32 of the bushing.
- a pin 27 at an outer or inner end of the thread 6 of the spindle may abut on the side wall of the boring 36 when the bushing 8 reaches its extreme positions on the spindle.
- the bushing 8" is provided with an axially extending stop face 37 which is formed in a sloping recess 38 in an end face 24 or 32 of the bushing.
- the stop face 37 has a radial extension allowing the spindle pin 27 protruding into the recess by rotation of the spindle by an outer or inner end.
Abstract
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE60000828T DE60000828T2 (en) | 1999-04-21 | 2000-04-14 | ACTUATOR |
AT00918720T ATE228219T1 (en) | 1999-04-21 | 2000-04-14 | ACTUATOR |
JP2000612649A JP2002542440A (en) | 1999-04-21 | 2000-04-14 | Actuator |
DK00918720T DK1171726T3 (en) | 1999-04-21 | 2000-04-14 | Actuator |
AU39575/00A AU3957500A (en) | 1999-04-21 | 2000-04-14 | Actuator |
EP00918720A EP1171726B1 (en) | 1999-04-21 | 2000-04-14 | Actuator |
US09/958,878 US6546825B1 (en) | 1999-04-21 | 2000-04-14 | Actuator |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DKPA199900545 | 1999-04-21 | ||
DKBA199900545 | 1999-04-21 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000063590A1 true WO2000063590A1 (en) | 2000-10-26 |
Family
ID=8157161
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DK2000/000185 WO2000063590A1 (en) | 1999-04-21 | 2000-04-14 | Actuator |
Country Status (1)
Country | Link |
---|---|
WO (1) | WO2000063590A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1785346A2 (en) | 2005-11-15 | 2007-05-16 | Honeywell International Inc. | Flight control surface actuator assembly |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2701478A (en) * | 1949-10-27 | 1955-02-08 | Hanley L Riess | Nonjamming stop and overload control for actuators |
US3277736A (en) * | 1964-07-27 | 1966-10-11 | Goodman Robert | Device for translating rotary motion into linear motion |
US3563106A (en) * | 1969-09-29 | 1971-02-16 | Robert Goodman | Device for translating rotary motion into linear motion |
US5673593A (en) * | 1995-12-14 | 1997-10-07 | Joerns Healthcare, Inc. | Overrunning nut for linear actuator |
-
2000
- 2000-04-14 WO PCT/DK2000/000185 patent/WO2000063590A1/en active IP Right Grant
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2701478A (en) * | 1949-10-27 | 1955-02-08 | Hanley L Riess | Nonjamming stop and overload control for actuators |
US3277736A (en) * | 1964-07-27 | 1966-10-11 | Goodman Robert | Device for translating rotary motion into linear motion |
US3563106A (en) * | 1969-09-29 | 1971-02-16 | Robert Goodman | Device for translating rotary motion into linear motion |
US5673593A (en) * | 1995-12-14 | 1997-10-07 | Joerns Healthcare, Inc. | Overrunning nut for linear actuator |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1785346A2 (en) | 2005-11-15 | 2007-05-16 | Honeywell International Inc. | Flight control surface actuator assembly |
EP1785346A3 (en) * | 2005-11-15 | 2008-03-26 | Honeywell International Inc. | Flight control surface actuator assembly |
US7610828B2 (en) | 2005-11-15 | 2009-11-03 | Honeywell International Inc. | Flight control surface actuator assembly including a free trial mechanism |
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