WO2001034985A1 - A locking device for a shaft - Google Patents

A locking device for a shaft Download PDF

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Publication number
WO2001034985A1
WO2001034985A1 PCT/SE2000/002194 SE0002194W WO0134985A1 WO 2001034985 A1 WO2001034985 A1 WO 2001034985A1 SE 0002194 W SE0002194 W SE 0002194W WO 0134985 A1 WO0134985 A1 WO 0134985A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston
locking device
pressure medium
sleeve
piston arrangement
Prior art date
Application number
PCT/SE2000/002194
Other languages
French (fr)
Inventor
Gustav Svensson
Original Assignee
Ab Svenska Precisionsverktyg
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 Ab Svenska Precisionsverktyg filed Critical Ab Svenska Precisionsverktyg
Priority to AU13224/01A priority Critical patent/AU1322401A/en
Publication of WO2001034985A1 publication Critical patent/WO2001034985A1/en

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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C11/00—Pivots; Pivotal connections
    • F16C11/04—Pivotal connections
    • F16C11/10—Arrangements for locking
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D49/00—Brakes with a braking member co-operating with the periphery of a drum, wheel-rim, or the like
    • F16D49/14—Brakes with a braking member co-operating with the periphery of a drum, wheel-rim, or the like shaped as a fluid-filled flexible member actuated by variation of the fluid pressure
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2121/00—Type of actuator operation force
    • F16D2121/02—Fluid pressure
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2123/00—Multiple operation forces
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2125/00—Components of actuators
    • F16D2125/02—Fluid-pressure mechanisms
    • F16D2125/026—Pressure-to-pressure converters, e.g. hydropneumatic

Definitions

  • the present invention relates to a locking device for a shaft with the aid of a sleeve-shaped membrane communicating with a piston arrangement for converting pressure in a pressure medium to a force.
  • a locking device designed to lock a joint between a first arm and a sec- ond arm constituting, for instance, a supporting arm for a drilling screw driver, power-wrench, fixture or the like where the aim is to hold the arms fixed in relation to each other and arranged, for instance, to be able to absorb forces arising upon activation of a drilling screw driver or power-wrench.
  • Conventional locking devices comprise various mechanically co-operating friction means such as a cone cou- pling or other similar clamping devices. Common to these are that they are locked manually by means of levers or the like and that they have a relatively long overall length and therefore encroach on the available space.
  • the object of the present invention is to provide a locking device for the purposes mentioned above, that does not have the drawbacks of the known locking devices.
  • the object is achieved with a locking device arranged in a cylindrical bearing in a housing where the bearing comprises a sleeve with a membrane that communicates with a space located between the sleeve and the housing, and containing a first pressure medium. This space communicates with a primary piston arrangement via the first pressure medium.
  • the primary piston arrangement is also in communication with a secondary piston arrangement that in turn communicates with a pressure source for a second pressure medium.
  • the shaft can be locked to prevent turning or axial displacement in relation to the housing when in- creased pressure is applied to the second pressure medium, which in turn causes increased pressure in the first pressure medium and an elastic decrease in diameter in the membrane of the sleeve.
  • the first pressure medium preferably consists of a liquid and the second pressure consists of air.
  • the primary piston arrangement comprises at least one piston, arranged to move parallel to the longitudinal direction of the shaft and the secondary piston arrangement comprises at least one first secondary piston in connection with the primary piston or pistons in the primary piston arrangement.
  • the first secondary piston is rigidly connected to at least one second secondary piston running in a second secondary cylinder, the secondary cylinders communicating with a pressure source via pipes or tubes.
  • two secondary cylinders are arranged along one and the same centre line and are supported by a common pis- ton rod.
  • the secondary cylinders may be arranged annularly on a piston sleeve running on the outside of the housing, its bottom supporting the hydraulic primary pistons.
  • the secondary cylinders are formed by a casing that encompasses the piston sleeve and includes a partition wall.
  • the active piston area that is subjected to pressure from the pressure medium can be made larger than the piston area of a single piston running in a single cylinder, thereby enabling greater forces to be developed within a given cylinder diameter.
  • Figure 1 shows a piston arrangement in accordance with the invention, ar- ranged in a hydraulic locking device to lock a joint between two arms.
  • Figure 2 shows a longitudinal section through the hydraulic locking device according to Figure 1 , including the piston arrangement.
  • Figure 1 shows a locking device 1 arranged to lock a joint between a first arm 2 and a second arm 3 that may constitute a supporting arm for a drilling screw driver, power-wrench, fixture or the like, where the purpose is to keep the arms fixed relative each other, and arranged, for instance, to be able to absorb forces arising upon activation of a drilling screw driver or power-wrench.
  • the joint between the arms 2, 3 comprises a shaft pin 4 arranged rigidly on the second arm 3 and about which the first arm 2 can turn in a cylindrical recess 2.1 arranged therein.
  • the shaft pin 4 is journalled in a housing 5 in the locking device 1 , which housing is arranged rigidly on the first arm 2 via a flange 6 and having a sliding bearing in the form of a sleeve 5.1 in the housing 5, simultaneously acting as a hydraulic membrane.
  • a piston arrangement 8 for compressed air is arranged to influence a hydraulic piston arrangement 7 having two hydraulic pistons 7.1 running in cylinder cavities 7.2 filled with hydraulic liquid and located parallel with the longitudinal di- rection of the shaft pin 4.
  • a channel 7.3 is arranged, connecting each cylinder cavity 7.2 with a space 7.4 located between the housing 5 and the membrane in the sleeve 5.1.
  • the piston arrangement 8 for compressed air comprises a first piston 8.1 running in a first compressed air cylinder 8.2 and in connection with the two hydraulic pistons 7.1 ar- ranged on the lower side of the first piston 8.1.
  • a second piston 8.3 is rigidly connected to the first piston 8.1 and runs in a second compressed air cylinder 8.4.
  • the two compressed air cylinders 8.2, 8.4 have the same cylinder diameter, are situated along the same centre line as the shaft pin 4 and the sleeve 5.1 and are separated from each other by a partition wall 8.5 having an opening for a piston rod 8.6 that connects the two pistons 8.1, 8.3.
  • the second compressed air cylinder 8.4 is covered by a cylinder head 8.7.
  • the space under the lower side of the pistons 8.1 , 8.3 communicates with the open air through an evacuation opening, not shown in Figure 2. Compressed air is supplied to the two cylinders 8.2, 8.3 through pipes or tubes 8.8, 8.9.
  • the construction of the piston arrangement 8 for compressed air can be seen in Figure 2, where the partition wall 8.5 is larger in diameter than the first cylinder 8.2, and rests against an annular rim of this cylinder.
  • the partition wall 8.5 is retained by an annular cylinder sleeve 8.10 having the same outer diameter as the partition wall 8.5 and the same inner diameter as the first cylinder 8.2.
  • the cyl- inder head 8.7 abuts the cylindrical sleeve 8.10 and is held in place by means of a resilient locking ring 8.11.
  • the pistons 8.1 , 8.3, the partition wall 8.5 and the cylinder head 8.7 are provided with seals 8.12 arranged around the outer border of each member.
  • the piston arrangement 8 for compressed air is arranged annularly, surrounding the housing 5 with the sleeve 5.1 and its membrane.
  • the pistons 8.1 , 8.3 are arranged annularly on a piston sleeve 8.13 running on the outside of the housing 5 and having a bottom 8.14 that supports the hydraulic pistons 7.1.
  • the cylinders 8.2, 8.4 are formed by a casing 8.15 that encompasses the piston sleeve 8.13 and includes a partition wall 8.5.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Actuator (AREA)
  • Support Of The Bearing (AREA)

Abstract

A locking device for a shaft (4) arranged in a cylindrical bearing (5.1) in a housing (5), said bearing (5.1) comprising a sleeve with a membrane that communicates with a space (7.4) containing a first pressure medium. The first space (7.4) communicates with a primary piston arrangement (7) via the first pressure medium. The primary piston arrangement (7) is also in mechanical connection with a secondary piston arrangement (8) that in turn communicates with a pressure source for a second pressure medium. The shaft (4) can be locked to prevent turning or axial displacement in relation to the housing (5) when increased pressure is applied to the second pressure medium, which in turn causes increased pressure in the first pressure medium and an elastic decrease in diameter in the membrane of the sleeve (5.1).

Description

A LOCKING DEVICE FOR A SHAFT
Technical field
The present invention relates to a locking device for a shaft with the aid of a sleeve-shaped membrane communicating with a piston arrangement for converting pressure in a pressure medium to a force.
Background art
In a locking device designed to lock a joint between a first arm and a sec- ond arm constituting, for instance, a supporting arm for a drilling screw driver, power-wrench, fixture or the like where the aim is to hold the arms fixed in relation to each other and arranged, for instance, to be able to absorb forces arising upon activation of a drilling screw driver or power-wrench. Conventional locking devices comprise various mechanically co-operating friction means such as a cone cou- pling or other similar clamping devices. Common to these are that they are locked manually by means of levers or the like and that they have a relatively long overall length and therefore encroach on the available space.
Description of the invention The object of the present invention is to provide a locking device for the purposes mentioned above, that does not have the drawbacks of the known locking devices. The object is achieved with a locking device arranged in a cylindrical bearing in a housing where the bearing comprises a sleeve with a membrane that communicates with a space located between the sleeve and the housing, and containing a first pressure medium. This space communicates with a primary piston arrangement via the first pressure medium. The primary piston arrangement is also in communication with a secondary piston arrangement that in turn communicates with a pressure source for a second pressure medium. The shaft can be locked to prevent turning or axial displacement in relation to the housing when in- creased pressure is applied to the second pressure medium, which in turn causes increased pressure in the first pressure medium and an elastic decrease in diameter in the membrane of the sleeve. The first pressure medium preferably consists of a liquid and the second pressure consists of air. The primary piston arrangement comprises at least one piston, arranged to move parallel to the longitudinal direction of the shaft and the secondary piston arrangement comprises at least one first secondary piston in connection with the primary piston or pistons in the primary piston arrangement. The first secondary piston is rigidly connected to at least one second secondary piston running in a second secondary cylinder, the secondary cylinders communicating with a pressure source via pipes or tubes.
In a certain embodiment of the invention two secondary cylinders are arranged along one and the same centre line and are supported by a common pis- ton rod. However, in different embodiment, the secondary cylinders may be arranged annularly on a piston sleeve running on the outside of the housing, its bottom supporting the hydraulic primary pistons. In this embodiment the secondary cylinders are formed by a casing that encompasses the piston sleeve and includes a partition wall. The constructional length of the locking device in accordance with the invention can be made extremely short and space-saving, while still providing satisfactory locking between shaft and housing, i.e. between the parts surrounding the locking device, e.g. arms in a drilling screw driver. Furthermore, thanks to the piston arrangement included in the invention, the active piston area that is subjected to pressure from the pressure medium can be made larger than the piston area of a single piston running in a single cylinder, thereby enabling greater forces to be developed within a given cylinder diameter.
Additional features and characteristics of the invention are revealed in the following description with reference to the drawings and in the claims.
Description related to the drawings
The invention is described in the following, referring to one embodiment by way of example, and with reference to the accompanying drawings. Figure 1 shows a piston arrangement in accordance with the invention, ar- ranged in a hydraulic locking device to lock a joint between two arms. Figure 2 shows a longitudinal section through the hydraulic locking device according to Figure 1 , including the piston arrangement. Figure 1 shows a locking device 1 arranged to lock a joint between a first arm 2 and a second arm 3 that may constitute a supporting arm for a drilling screw driver, power-wrench, fixture or the like, where the purpose is to keep the arms fixed relative each other, and arranged, for instance, to be able to absorb forces arising upon activation of a drilling screw driver or power-wrench. The joint between the arms 2, 3 comprises a shaft pin 4 arranged rigidly on the second arm 3 and about which the first arm 2 can turn in a cylindrical recess 2.1 arranged therein. The shaft pin 4 is journalled in a housing 5 in the locking device 1 , which housing is arranged rigidly on the first arm 2 via a flange 6 and having a sliding bearing in the form of a sleeve 5.1 in the housing 5, simultaneously acting as a hydraulic membrane.
A piston arrangement 8 for compressed air is arranged to influence a hydraulic piston arrangement 7 having two hydraulic pistons 7.1 running in cylinder cavities 7.2 filled with hydraulic liquid and located parallel with the longitudinal di- rection of the shaft pin 4. At the inner end of each cylinder cavity 7.2 a channel 7.3 is arranged, connecting each cylinder cavity 7.2 with a space 7.4 located between the housing 5 and the membrane in the sleeve 5.1. The piston arrangement 8 for compressed air comprises a first piston 8.1 running in a first compressed air cylinder 8.2 and in connection with the two hydraulic pistons 7.1 ar- ranged on the lower side of the first piston 8.1. A second piston 8.3 is rigidly connected to the first piston 8.1 and runs in a second compressed air cylinder 8.4. The two compressed air cylinders 8.2, 8.4 have the same cylinder diameter, are situated along the same centre line as the shaft pin 4 and the sleeve 5.1 and are separated from each other by a partition wall 8.5 having an opening for a piston rod 8.6 that connects the two pistons 8.1, 8.3. The second compressed air cylinder 8.4 is covered by a cylinder head 8.7. The space under the lower side of the pistons 8.1 , 8.3 communicates with the open air through an evacuation opening, not shown in Figure 2. Compressed air is supplied to the two cylinders 8.2, 8.3 through pipes or tubes 8.8, 8.9. The construction of the piston arrangement 8 for compressed air can be seen in Figure 2, where the partition wall 8.5 is larger in diameter than the first cylinder 8.2, and rests against an annular rim of this cylinder. The partition wall 8.5 is retained by an annular cylinder sleeve 8.10 having the same outer diameter as the partition wall 8.5 and the same inner diameter as the first cylinder 8.2. The cyl- inder head 8.7 abuts the cylindrical sleeve 8.10 and is held in place by means of a resilient locking ring 8.11. The pistons 8.1 , 8.3, the partition wall 8.5 and the cylinder head 8.7 are provided with seals 8.12 arranged around the outer border of each member. When the compressed air cylinders 8.2, 8.4 are not under pressure, the pistons 8.1 , 8.3 in them are kept displaced to a rear position by means of springs 9 arranged between the housing 5 and the lower side of the first compressed air piston 8.1. When the compressed air cylinders are pressurised the pistons 8.1,
8.3 are pressed towards the sleeve 5.1 with the shaft pin 4 inserted, whereupon the hydraulic pistons 7.1 press hydraulic fluid under high pressure into the space
7.4 adjacent to the membrane in the sleeve 5.1. The pressure increase in the hydraulic fluid causes the membrane to resiliently press against the shaft pin 4 and lock this firmly in the sleeve 5.1. The joint between the arms 2, 3 is thus prevented from turning. In the locking device 1 shown in Figure 3 the piston arrangement 8 for compressed air is arranged annularly, surrounding the housing 5 with the sleeve 5.1 and its membrane. The pistons 8.1 , 8.3 are arranged annularly on a piston sleeve 8.13 running on the outside of the housing 5 and having a bottom 8.14 that supports the hydraulic pistons 7.1. The cylinders 8.2, 8.4 are formed by a casing 8.15 that encompasses the piston sleeve 8.13 and includes a partition wall 8.5. Compressed air is supplied to the two cylinders 8.2, 8.4 through pipes 8.8, 8.9 as in the previous example. Neither the securing of the housing 5 on the first arm 2, nor the components in the piston sleeve 8.13 and casing 8.15 are shown in Figure 3.

Claims

1. A locking device for a shaft (4) arranged in a cylindrical bearing (5.1) in a housing (5), said bearing (5.1) comprising a sleeve with a membrane that com- municates with a space (7.4) located between the housing (5) and the sleeve (5.1) and containing a first pressure medium, wherein the first space (7.4) communicates with a primary piston arrangement (7) via the first pressure medium, characterized in that the primary piston arrangement (7) comprises one or more primary cylinders (7.2) with pistons (7.1), in that the primary pistons (7.1) in the pri- mary piston arrangement (7) are in mechanical connection with a secondary piston arrangement (8) comprising at least one first secondary cylinder (8.2) with a first secondary piston (8.1), and in that the first secondary cylinder (8.2) communicates with a pressure source for a second pressure medium, so that the shaft (4) can be locked to prevent turning or axial displacement in relation to the housing (5) when increased pressure is applied to the second pressure medium, which in turn causes increased pressure in the first pressure medium and an elastic decrease in diameter in the membrane of the sleeve (7).
2. A locking device as claimed in claim 1 , characterized in that the first pressure medium consists of a liquid and that the second pressure medium consists of air.
3. A locking device as claimed in claim 1 or claim 2, characterized in that the primary piston arrangement (7) comprises one or more pistons (7.1) arranged to move parallel to the longitudinal direction of the shaft (4).
4. A locking device as claimed in any one of claims 1-3, characterized in that the secondary piston arrangement (8) comprises at least one first secondary piston (8.1) connected mechanically to the primary piston or pistons (7.1) in the first piston arrangement (7).
5. A locking device as claimed in any one of claims 1-4, characterized in that the first secondary piston (8.1) is rigidly connected to at least one other secondary piston (8.3) running in a second secondary cylinder (8.4), the secondary cylinders (8.2, 8.4) communicating with a pressure source for the second pressure medium via pipes (8.8, 8.9)
6. A locking device as claimed in claim 5, characterized in that the two sec- ondary cylinders (8.2, 8.4) are arranged along one and the same centre line.
7. A locking device as claimed in claim 5 or claim 6, characterized in that the secondary cylinders (8.2, 8.4) are arranged annularly on a piston sleeve (8.13) running on the outside of the housing (5) and having a bottom (8.14) supporting the hydraulic pistons (7.1), and in that the cylinders (8.2, 8.4) are formed by a casing (8.15) that encompasses the piston sleeve (8.13) and includes a partition wall (8.5).
8. A locking device as claimed in claim 5 or claim 6, characterized in that the first secondary cylinder (8.2) and the second secondary cylinder (8.4) have substantially the same inner diameter.
PCT/SE2000/002194 1999-11-11 2000-11-09 A locking device for a shaft WO2001034985A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU13224/01A AU1322401A (en) 1999-11-11 2000-11-09 A locking device for a shaft

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9904093A SE515199C2 (en) 1999-11-11 1999-11-11 Locking device for one shaft
SE9904093-3 1999-11-11

Publications (1)

Publication Number Publication Date
WO2001034985A1 true WO2001034985A1 (en) 2001-05-17

Family

ID=20417692

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2000/002194 WO2001034985A1 (en) 1999-11-11 2000-11-09 A locking device for a shaft

Country Status (3)

Country Link
AU (1) AU1322401A (en)
SE (1) SE515199C2 (en)
WO (1) WO2001034985A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004053382A1 (en) * 2002-12-09 2004-06-24 Synthes Ag Chur Joint for movably connecting two stabilizing elements
DE102005009728A1 (en) * 2005-03-03 2006-09-14 Schulte, Reinhold, Dipl.-Ing. Brake for pneumatic cylinder piston rods has jaws which move to fix rod axially and are operated by flexible sleeve on their outer side enclosing chamber whose internal pressure is controlled by pneumatic-hydraulic piston system
CN100383427C (en) * 2003-08-05 2008-04-23 克劳斯·霍夫曼 Clamping and/or braking device
CN101476542B (en) * 2008-11-25 2011-05-11 上海应用技术学院 Adjustable off-course brake of wind motor
WO2016085547A1 (en) * 2014-11-25 2016-06-02 Cummins Inc. Jointed stall bar attachment
US10960531B2 (en) 2014-11-25 2021-03-30 Cummins Inc. Jointed stall bar attachment

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3737130A (en) * 1970-06-25 1973-06-05 Slick Tripod Co Ltd Hydraulically operated tripod head
DE2848283A1 (en) * 1977-11-09 1979-05-10 Hans Otto Olsson LOCKABLE ROTATING COUPLING
EP0868885A1 (en) * 1997-03-31 1998-10-07 Mitaka Kohki Co., Ltd. Articulated arm for surgeon's chair

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3737130A (en) * 1970-06-25 1973-06-05 Slick Tripod Co Ltd Hydraulically operated tripod head
DE2848283A1 (en) * 1977-11-09 1979-05-10 Hans Otto Olsson LOCKABLE ROTATING COUPLING
EP0868885A1 (en) * 1997-03-31 1998-10-07 Mitaka Kohki Co., Ltd. Articulated arm for surgeon's chair

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004053382A1 (en) * 2002-12-09 2004-06-24 Synthes Ag Chur Joint for movably connecting two stabilizing elements
US8016510B2 (en) 2002-12-09 2011-09-13 Synthes Usa, Llc Joint for movably connecting two stabilizing elements
CN100383427C (en) * 2003-08-05 2008-04-23 克劳斯·霍夫曼 Clamping and/or braking device
DE102005009728A1 (en) * 2005-03-03 2006-09-14 Schulte, Reinhold, Dipl.-Ing. Brake for pneumatic cylinder piston rods has jaws which move to fix rod axially and are operated by flexible sleeve on their outer side enclosing chamber whose internal pressure is controlled by pneumatic-hydraulic piston system
DE102005009728B4 (en) * 2005-03-03 2010-03-18 Schulte, Reinhold, Dipl.-Ing. braking device
CN101476542B (en) * 2008-11-25 2011-05-11 上海应用技术学院 Adjustable off-course brake of wind motor
WO2016085547A1 (en) * 2014-11-25 2016-06-02 Cummins Inc. Jointed stall bar attachment
US10960531B2 (en) 2014-11-25 2021-03-30 Cummins Inc. Jointed stall bar attachment

Also Published As

Publication number Publication date
SE9904093D0 (en) 1999-11-11
SE9904093L (en) 2001-05-12
AU1322401A (en) 2001-06-06
SE515199C2 (en) 2001-06-25

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