CN101253350B - Actuator - Google Patents
Actuator Download PDFInfo
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- CN101253350B CN101253350B CN200680031744.3A CN200680031744A CN101253350B CN 101253350 B CN101253350 B CN 101253350B CN 200680031744 A CN200680031744 A CN 200680031744A CN 101253350 B CN101253350 B CN 101253350B
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Abstract
The present invention discloses an actuator of the type where a driving rod (11) is extended by a nut (10) on a driven spindle. A manually operated emergency lowering device (14) for the driving rod (11) is mounted between the driving rod (11) and a mounting bracket (16) at the end thereof . The emergency lowering device (14) comprises a first cylindrical part (15) connected with the mounting bracket (16) and a second cylindrical part (17) connected with the driving rod (11) . The two cylindrical parts are coupled together by a screw spring (21) . The spring is released by an operating grip (19) constructed as a bushing in which the one end (22) of the spring (21) is secured. The other end (23) of the spring (21) is secured in the cylindrical part (17) connected with the driving rod (11) . Rotation of the bushing causes the spring (21) to be released, whereby the driving rod (11) may be screwed back by the manually applied torque.
Description
Technical field
The present invention relates to a kind of actuator that comprises reversing motor, this reversing motor makes axle around its longitudinal axis rotation by transmission device.
Background technique
In brief, linear actuators comprises by reversing motor by the axle of actuator drives.In this axle, be provided with nut, drive link is fixed on axle nut.Axle nut is fixed and can not rotates and outwards or inwardly move in axle according to the sense of rotation of motor, and drive link is along with nut extends or retracts.
According to the structure that comprises actuator, actuator can possess fast release function or promptly fall function.When being conventionally used in for the actuator of hospital or care bed to can or falling into a coma at heart of patient onste, falls immediately fast release function for example backrest.Promptly fall function and be generally used for being included in the actuator in patient lift, so that can be because power failure is former thereby patient is fallen.At this, problem is as far as possible gently to fall patient, and is to react as far as possible rapidly to rescue life for the problem of fast release function.
The present invention relates to promptly fall function, the example of this function for example sees patent application DE 196 47 556 A1 of Rudolf Weiner, and the mode that wherein drive link is sold by disconnection is released, and can inwardly rotate drive link with hand thus in the time catching drive link.In the patent application DK 130 460 of Trioterm A/S, in disclosed actuator, drive link clamps lining by one and fixes, and discharges drive link by utilizing operating grip to unclamp this clamping lining.In the patent application DE of Okin 199 50 689 A1, disclose a kind of structure with two coupling member, these two coupling member are loaded to be bonded with each other by spring.In the time that connection gets loose, can manually inwardly rotate drive link.EP 0 789 665 discloses a kind of structure with biased friction, wherein utilize friction to make drive link in the time of normal running fix and can not rotate, but this friction can be overcome by external torque, overcomes by rotary liner, and drive link is rotated thus.Finally, EP 1 457 710 A1 disclose a kind of structure that comprises the claw type joiner (claw coupling) being surrounded by helical spring, and it is as break.By making operating grip turn over several angle, just cause that this claw type joiner is released, act on load on mounting bracket cause thus axle nut and the drive link being connected with nut non-on lock mandrel to inward turning, claw type joiner connecting brake spring and the further motion of therefore braking drive link again thus.In order to reduce load, must multi-pass operation claw type joiner.
Summary of the invention
The object of this invention is to provide a kind of simple in structure, reliable promptly structure of Descent apparatus of operation.
Object of the present invention can realize by constructing a kind of actuator that comprises reversing motor, this reversing motor makes axle around its longitudinal axis rotation by transmission device, its central shaft nut is arranged in axle, drive link is connected with axle nut with its caudal end, wherein mounting bracket is fixed on the front end of drive link, described mounting bracket is used for actuator to be arranged between the movable part and static part in the structure that will comprise actuator together with the second bracket, wherein urgent Descent apparatus is arranged between drive link and mounting bracket, described urgent Descent apparatus comprises:
A) the first pipe being connected with mounting bracket,
B) the second pipe being connected with this drive link,
C) helical spring,
D) operating grip,
Wherein by utilizing operating grip to discharge helical spring, the first pipe and the second pipe can be rotated independently of one another,
It is characterized in that,
Operating grip is designed to lining, and one end of spring is fixed in lining,
The other end of spring is fixed in the second pipe being connected with drive link,
Tightly lay around the first pipe being connected with mounting bracket as the helical spring that connects spring.
Preferably, lining has the cannelure of the outwardly-bent end that puts spring.
Preferably, operating grip and the second pipe being connected with drive link have the bearing device of cooperation.
Preferably, bearing device is and the form that is positioned at the protrudent pin on the second pipe of edge mate that is positioned at the groove on operating grip.
Preferably, groove is arranged at the end of the groove for putting spring end.
Preferably, lining comprises inner cylindrical part and the outer cylindrical parts with coupling arrangement.
Preferably, coupling arrangement is formed by the spring legs being positioned on neck bush parts, and described spring legs has leg, thereby described leg is for matching and be fixed by spring latch effect with the corresponding recesses at the edge of the second pipe.
Preferably, the size of groove is larger than the size of leg, therefore slightly rotary liner to unclamp connection spring.
Preferably, groove is arranged in the mating face of the spring on the first pipe to reduce friction.
Preferably, recess configurations is the ribwork transverse to spring pitch of the laps.
At this, lay around the pipe being connected with mounting bracket tightly as the helical spring that connects spring.One end of spring utilizes bending end to be fixed on operating grip, and the other end is fixed in the pipe being connected with the drive link of actuator.By this structure, operating grip can be configured to a simple lining, so just can avoid using claw type joiner.In the time of rotating operation handle, be released and disconnect being connected of drive link and mounting bracket thereby connect spring.In the process that is rotated further operating grip, torsional interaction is in drive link, so as to make drive link in axle to inward turning.Compared with structure in EP 1 457 710 A1, the load acting in EP 1,457 710 A1 on actuator makes drive link motion, and is on lining, manually to apply moment of torsion to make drive link cycle in the present invention.This also means that structure in EP 1 457 710 A1 is only equipped with and non-ly could operates during from lock mandrel at actuator.On the other hand, if actuator is equipped with from lock mandrel, load just can not push back drive link so, because nut is " locked " in axle.
Aptly, spring is fixed to lining so that the bandy end of spring is received within the groove of longitudinal extension of lining.This mode is convenient to install.
In the time rotating lining, spring stretches, and the moment of torsion acting on thus on lining is passed to drive link via spring.In order to prevent from making spring overload, operating grip and the pipe being connected with drive link are provided with the bearing device (carrier means) of cooperation.In the time that spring suitably rotates to can determine that the connection of spring is disconnected, bearing device formation contacts and continues transmitting torque.In their the simplest form, this bearing device can be the protrudent pin on the pipe of drive link, and this protrudent pin coordinates with the recess edge in operating grip.Aptly, this groove is arranged at the end of the groove for laying spring.
Brief description of the drawings
The present invention is described below with reference to the accompanying drawings more fully, in accompanying drawing:
Fig. 1 shows a patient lift side view,
Fig. 2 shows the longitudinal cross-section of a linear actuators,
Fig. 3 shows the longitudinal cross-section of a urgent Descent apparatus,
Fig. 4 shows the exploded view of a urgent Descent apparatus,
Fig. 5 shows the exploded view of the second embodiment's urgent Descent apparatus,
Fig. 6 shows the longitudinal cross-section of this urgent Descent apparatus,
Fig. 7 shows the side view of this urgent Descent apparatus,
Fig. 8 shows the plan view of this urgent Descent apparatus,
Fig. 9 shows the worm's eye view of this urgent Descent apparatus, and
Figure 10 shows a linear actuators that is equipped with urgent Descent apparatus.
Embodiment
Patient lift as shown in Figure 1 comprises the framework 1 that is provided with wheel.Can be fixed on framework in its one end around the pull bar of transverse axis pivotable 2.Be fixed to the other end of pull bar for lifting patient's suspension hook 3.Pull bar is risen and is fallen by a linear actuators 4, and one end of linear actuators is fixed on framework, and the other end of linear actuators is fixed on pull bar.The Direct box 5 that comprises control unit and rechargeable battery is for operate actuator and be arranged on framework.
As can be seen from Figure 2, the critical piece of actuator is formed by the housing 6 with reversing motor 7, reversing motor 7 is the axle 9 with axle nut 10 by actuator drives, be worm gear and angular gear at this transmission device, drive link 11 (inner tube) is fixed on described axle nut, and this drive link telescopically is arranged in the tubular part (outer tube) 12 of housing.Housing has the back seat 13 for stationary actuator rear end.
If generation power failure, can manually fall pull bar 2 by means of urgent Descent apparatus.In the time that operating grip 19 clockwise rotates, end 22 clockwise rotates too, and the diameter of spring increases thus, therefore discharges pipe 15.The other end 23 of spring is fixed in pipe 17.Being rotated further lining makes the edge of groove engage with pin 25.When the pipe 15 with mounting bracket 16 is when the pipe 17 of drive link 11 ends is released, pipe 17 rotate together with lining and nut in axle to inward turning, drive link is pulled inwards and pull bar 2 is lowered to its initial position downwards thus.In the time that lining 19 is released, the spring loading force of spring 21 will automatically ensure that the pipe 15 with mounting bracket 16 is connected.
Fig. 5-9 show a kind of embodiment of slightly different urgent Descent apparatus.Due to basic structure and mode of operation and aforementioned identical, therefore adopt identical reference character to represent same parts.The present embodiment is different from last embodiment's part and is: lining 19 ' comprise external bushing parts 19 ' a and neck bush parts 19 ' b.Neck bush parts 19 ' b comprises three spring legs 28 with leg 29, to coordinate with the corresponding recesses 30 in the edge of pipe 17, thereby is fixed by spring latch effect.The size of groove 30 exceedes the size of leg 29, therefore can by foregoing the same manner slightly rotary liner in case unclamp connect spring 21.For make to connect spring pipe 15 ' on friction be applicable to, pipe 15 ' sidewall be provided with ribwork (ribbed pattern) 40, the area that sidewall engages with spring so just can not be very large, and frictional force is corresponding less thus.For the given spring of length, can utilize the groove in mating face to reduce friction.At this, two pipes 15 ', bearing between 17 be sliding bearing 18 '.If actuator is tightened up because of carelessness, screw 31 just in time can be used to prevent pipe 15 ' be pushed upwardly.Due to spring legs 28 in outside with rib 32, and the mating groove 33 of rib 32 and external bushing parts 19 ' a inner side matches and fixed by the spring latch of circle edge 34 forms that engage with the necking section 35 of neck bush parts 19 ' b bottom, therefore make the external bushing parts 19 ' a of lining be fixed on neck bush parts 19 ' b.For the purpose of well orderly, can see, reference character 36 represents two liners for the hole 35 of mounting bracket 16.Lining 19 ' arranged outside have waveform configuration (wave-shaped pattern) thus 37 provide the mode better being gripped by hand, and at top, arrow 38 represents sense of rotation.
Figure 10 shows the actuator that is provided with the urgent Descent apparatus shown in Fig. 5-10, and this actuator is the LA31 type of LINAK A/S company of Denmark.Urgent Descent apparatus by screw thread 39 screw in the tubulose drive link 11 of actuator ' end in.
Claims (10)
1. one kind comprises the actuator of reversing motor (7), this reversing motor (7) makes axle (9) around its longitudinal axis rotation by transmission device (8), its central shaft nut (10) is arranged in axle, drive link (11) is connected with axle nut with its caudal end, wherein mounting bracket (16) is fixed on the front end of drive link, described mounting bracket is used for actuator being arranged between the movable part and static part in the structure that will comprise actuator together with the second bracket (13), wherein urgent Descent apparatus (14) is arranged between drive link and mounting bracket, described urgent Descent apparatus comprises:
A) the first pipe (15) being connected with mounting bracket (16),
B) the second pipe (17) being connected with this drive link (11),
C) helical spring (21),
D) operating grip (19),
Wherein by utilizing operating grip (19) to discharge helical spring (21), the first pipe (15) and the second pipe (17) can be rotated independently of one another,
It is characterized in that,
Operating grip (19,19 ') is designed to lining, and one end (22) of spring (21) is fixed in lining,
The other end (23) of spring (21) is fixed in the second pipe (17) being connected with drive link (11),
Tightly lay around the first pipe (15) being connected with mounting bracket (16) as the helical spring (21) that connects spring.
2. actuator according to claim 1, is characterized in that, lining (19) has the cannelure (24) of the outwardly-bent end (22) that puts spring (21).
3. actuator according to claim 1, is characterized in that, operating grip (19) and the second pipe (17) being connected with drive link (11) have the bearing device (25,26) of cooperation.
4. actuator according to claim 3, it is characterized in that, bearing device is and the form that is positioned at the protrudent pin (25) on the second pipe (17) of edge mate that is positioned at the groove (26) on operating grip (19).
5. actuator according to claim 2, is characterized in that, groove (26) is arranged at the end of the cannelure (24) for putting spring end (22).
6. actuator according to claim 1, is characterized in that, lining (19 ') comprise have coupling arrangement inner cylindrical part (19 ' b) and outer cylindrical parts (19 ' a).
7. actuator according to claim 6, it is characterized in that, by being positioned at neck bush parts, (19 ' spring legs (28) on b) forms coupling arrangement, described spring legs has leg (29), described leg (29) for corresponding first groove (30) at the edge of the second pipe (17) thus match and be fixed by spring latch effect.
8. actuator according to claim 7, is characterized in that, the size of the first groove (30) is larger than the size of leg (29), and therefore rotary liner connects spring (21) to unclamp slightly.
9. actuator according to claim 1, is characterized in that, the second groove is arranged in the mating face of the spring (21) on the first pipe (15 ') to reduce friction.
10. actuator according to claim 9, is characterized in that, the second recess configurations is transverse to the ribwork of spring pitch of the laps (40).
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DKPA200501222 | 2005-09-02 | ||
| DKPA200501222 | 2005-09-02 | ||
| DKPA200501321 | 2005-09-22 | ||
| DKPA200501321 | 2005-09-22 | ||
| PCT/DK2006/000474 WO2007025550A1 (en) | 2005-09-02 | 2006-09-01 | Actuator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101253350A CN101253350A (en) | 2008-08-27 |
| CN101253350B true CN101253350B (en) | 2014-06-11 |
Family
ID=39956034
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200680031744.3A Active CN101253350B (en) | 2005-09-02 | 2006-09-01 | Actuator |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN101253350B (en) |
| ES (1) | ES2355427T3 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107965520A (en) * | 2017-11-28 | 2018-04-27 | 浙江中航通飞研究院有限公司 | It is a kind of can optional position locking linear motion device |
| EP3743642B1 (en) * | 2018-01-22 | 2023-08-02 | Linak A/S | Linear actuator |
| DK3877999T3 (en) * | 2018-11-09 | 2023-04-11 | Linak As | Emergency stop |
| DE202019103390U1 (en) * | 2019-06-17 | 2020-09-18 | Dewertokin Gmbh | Linear drive with position alignment means between guide tube and spindle nut |
| CN113839515A (en) * | 2021-09-30 | 2021-12-24 | 兰州万里航空机电有限责任公司 | Dual-redundancy roller screw pair actuator with anti-reversion mechanism |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4657425A (en) * | 1985-02-14 | 1987-04-14 | Nifco, Inc. | Device for locking rod against movement in extending and contracting directions |
| EP1457710A1 (en) * | 2003-03-14 | 2004-09-15 | Ab Skf | Linear actuator with emergency adjustment device |
-
2006
- 2006-09-01 ES ES06775960T patent/ES2355427T3/en active Active
- 2006-09-01 CN CN200680031744.3A patent/CN101253350B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4657425A (en) * | 1985-02-14 | 1987-04-14 | Nifco, Inc. | Device for locking rod against movement in extending and contracting directions |
| EP1457710A1 (en) * | 2003-03-14 | 2004-09-15 | Ab Skf | Linear actuator with emergency adjustment device |
Also Published As
| Publication number | Publication date |
|---|---|
| ES2355427T3 (en) | 2011-03-25 |
| CN101253350A (en) | 2008-08-27 |
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