• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Abstract The present invention provides a drive connection (26) for connecting the drive shaft (12) of a shearing hand piece (10) to the drive spindle (34) of a drive motor (32). The 5 drive spindle (34) is provided with a distal threaded portion (54) and a proximal tapered portion (56). The drive shaft (12) has an inner drive shaft member (23) provided with a complementarily tapered distal portion (72) and a complementarily threaded proximal portion (70). The drive shaft (12) is further provided with a sleeve (28) which, in use, receives the drive spindle (34) and further connects to a connection feature (38) of the 10 drive motor (32). The sleeve (28) is provided with a support surface against which an abutment surface of the inner drive shaft member (23) is able to rest when the drive motor (32) is not in operation. Fig. 3 4161985_1 (GHMatters) P92963.AU 15/03/13 i - 1-- -
    公开号:AU2013201563A1
    申请号:U2013201563
    申请日:2013-03-15
    公开日:2013-10-03
    发明作者:Robin James Howell；Wayne Thomas Mason；Jamie William Michael Stanfield；John Alun Harris Williams
    申请人:Lister Shearing Equipment Ltd；
    IPC主号:F16B7-18
    专利说明:
    - 1 Improved Drive Connection The present invention relates to a drive connection for an animal shearing device. 5 For the commercial shearing of animals such as sheep, a shearer typically uses a shearing hand piece which is driven by an external drive motor. Figure 1 shows a shearing hand piece 10 and a articulated drive shaft 12. The drive shaft 12 includes a short shaft section 14 and a long shaft section 16. The short shaft section 14 is pivotably connected at one end 18 to the shearing hand piece 10 and pivotably connected at the other end 20 to the 10 long shaft section 16. The long shaft section 16 is pivotably connected at one end 22 to the short s haft section 14. The other end 24 of the long shaft section 16 is provided with a drive connection, generally designated 26, which enables the drive shaft 12 to be connected to the drive spindle of a drive motor. 15 The long shaft section 16 of the drive shaft 12 is comprised of an inner shaft member and an outer sheath 17. The short shaft section 14 of the drive shaft 12 is similarly comprised of an inner shaft member and an outer sheath 15. The inner shaft members may be comprised of a plastics material, for example Nylon, in order to save weight. The region of the outer sheath 17 which is adjacent to the drive connection 26 comprises a coil 20 spring 78. This spring permits the inner shaft member to be flexed, for example due to movement of the drive shaft 12 as a whole during an animal shearing operation. Figures 2a to 2c illustrate a prior art drive connection 26 and its manner of operation. The drive connection 26 includes an axially movable sleeve 28 of the drive shaft 12 and 25 a bayonet slot 30 formed in the end 24 of the long shaft section 16. The bayonet slot 30 is typically provided in a tubular drive member 60 attached to the end of the inner shaft member rather than being formed in the end of the inner shaft member itself. The drive motor 32 is provided with a drive spindle 34 having a bayonet pin 36. The drive spindle 34 is further provided with co-axially arranged coil spring 39 which is retained on the 30 drive spindle 34 by the bayonet pin 36. 41619s_1 (GHMatters) P92963.AU 15/03/13 -2 In order to connect the drive shaft 12 to the drive motor 32 the sleeve 28 is moved so as to expose the drive member 60 at the end 24 of the long shaft section 16, and the end 24 is aligned with the drive spindle 34. This is shown in figure 2a. The bayonet pin 36 is then introduced into the bayonet slot 30, and the drive shaft 12 and drive spindle 34 5 rotated relative to one another to fully engage the pin 36 in the slot 30. This is shown in figure 2b. The coil spring 39 is compressed and provides a seating force on the drive shaft 12 to urge the bayonet pin 36 into the bayonet slot 30. The sleeve 28 is then moved axially in the direction of the drive motor 32 and secured to an annular boss 38 of the drive motor 32 which surrounds the drive spindle 34. The sleeve 28 is provided with an 10 upper clamp arrangement 40 having a wing nut 42 and a bolt 44 to enable the sleeve to be frictionally secured to the boss 38. The sleeve 28 is provided with a lower clamp arrangement 46 which, in use, retains the spring 78. The sleeve 28 is further provided with a lubrication aperture 48 which needs to be 15 aligned with the bayonet pin 36 and slot 30. The aperture 48 permits a user to periodically introduce lubricant into the sleeve to lubricate the connection between the drive shaft 12 and the drive spindle 34. According to a first aspect of the present invention there is provided a drive connection 20 for connecting the drive shaft of a shearing hand piece to the drive spindle of a drive motor, the drive spindle being provided with a distal threaded portion and a proximal tapered portion, the drive shaft having an inner drive shaft member being provided with an recessed end having a complementarily tapered distal portion and a complementarily threaded proximal portion, wherein, in use, the tapered portions of the drive spindle and 25 inner drive shaft member are in contact with one another when the drive motor is in operation and are separated from one another when the drive motor is not in operation, the drive shaft further being provided with a sleeve which, in use, receives the drive spindle end and further connects to a connection feature of the drive motor to releasably retain the drive shaft in association with the drive motor, wherein the sleeve is provided 30 with a support surface against which an abutment surface the inner drive shaft member end is able to rest when the drive motor is not in operation and the tapered portions are separated from one another, wherein further the support surface and abutment surface co 4161985_1 (GHMatters) P92963.AU 15/03/13 -3 operate to retain the inner drive shaft member within the sleeve when the drive motor is not in operation. The complementary tapered portions of the drive spindle and inner drive shaft member 5 are movable into contact with one another in order to connect the drive spindle for rotation with the inner drive shaft member. When the motor is not in operation the tapered portions separate from one another under the influence of gravity acting upon the inner drive shaft member. The engagement of the inner drive shaft member abutment surface with the sleeve support surface prevents the inner drive shaft member from 10 falling out of the sleeve when the drive motor is not in operation. It will be appreciated that, in use, the drive spindle and the drive shaft are aligned vertically. The thread form of the complementary threaded portions is of sufficient coarseness and clearance so as not to retain the tapered portions in connection with one another when motor is not in operation and the weight of the inner drive shaft member acts to move the inner drive 15 shaft member away from the drive spindle. In a preferred embodiment the end of the inner drive shaft member is defined by an attachment having the complementarily tapered distal portion, the complementarily threaded proximal portion and the abutment surface. Preferably the attachment is 20 substantially tubular. Connection of the attachment to the inner drive shaft member may be achieved by the engagement of a thread provided on the end to the inner drive shaft member to a complementary thread of the tubular attachment. The abutment surface of the tubular attachment may be a peripheral flange of the tubular attachment. 25 The support surface of the sleeve may be defined by a feature of the inner surface of the sleeve. Alternatively, the support surface of the sleeve may be defined by a member which is retained within the sleeve. In such an embodiment the support surface may be defined by a spring retained within the sleeve. 30 According to a second aspect of the present invention there is provided a shearing hand piece drive motor having a drive spindle, the drive spindle having a distal threaded portion and a proximal tapered portion, said threaded and tapered portions being 4161985_1 (GMatters) P92963.AU 15/03/13 -4 configured to, in use, connect to complementarily tapered and threaded portions of a drive shaft. According to a third aspect of the present invention there is provided a shearing hand 5 piece drive shaft, the drive shaft having an inner drive shaft member being provided with an end with a recess, the recess having a tapered distal portion and a threaded proximal portion, said tapered and threaded portions being configured to, in use, connect to a complementarily tapered and threaded portions of a drive spindle of a drive motor, wherein, in use, the tapered portions of the drive spindle and inner drive shaft member 10 are in contact with one another when the drive motor is in operation and are separated from one another when the drive motor is not in operation, the drive shaft further being provided with a sleeve which surrounds said end of the inner drive shaft member and has a support surface against which an abutment surface of the inner drive shaft member is able to rest when the drive motor is not in operation and the tapered portions are 15 separated from one another, wherein further the support surface and abutment surface co operate to retain the inner drive shaft member within the sleeve when the drive motor is not in operation. In a preferred embodiment the end of the inner drive shaft member is defined by an 20 attachment having the tapered distal portion, the threaded proximal portion and the abutment surface Preferably the attachment is substantially tubular. Connection of the attachment to the inner drive shaft member is achieved by the engagement of a thread provided on the end to the inner drive shaft member to a complementary thread of the tubular attachment. The abutment surface of the tubular attachment may be a peripheral 25 flange of the tubular attachment. The support surface of the sleeve may be defined by a feature of the inner surface of the sleeve. Alternatively, the support surface of the sleeve may be defined by a member which is retained within the sleeve. In such an embodiment the support surface may be 30 defined by a spring retained within the sleeve. 41619851 (GHMatters) P92963.AU 15/03/13 -5 An embodiment of the invention will now be described with reference to the accompanying drawings in which: Figure 1 shows a side view of a known shearing hand piece and drive shaft arrangement; Figures 2a to 2c show the manner in which a prior art drive shaft arrangement is 5 connected to a drive motor; Figure 3 shows a cross-sectional view of a partially engaged drive connection according to the present invention; Figure 4 shows a cross-sectional view of a fully engaged drive connection according to the present invention; and 10 Figure 5 shows a perspective view of drive motor drive spindle for use with the drive connection of the present invention. Figures 3 to 5 show an embodiment of a drive connection, generally designated 50, in accordance with the present invention. Features common to the prior art drive 15 connection described with reference to figures 1 to 2c are identified with like reference numerals. Looking firstly at the drive spindle 34, this is no longer provided with either a bayonet pin or spring. Instead, the distal end 52 of the spindle 34, which is to say the end of the 20 spindle which extends from and is furthest from the annular boss 38 of the drive motor, is provided with a coarse thread 54. The thread 54 extends from the tip of the spindle 34 to a substantially frusto conical drive face 56. The end 24 of the inner drive shaft member 23 of the drive shaft 12 is provided with a 25 thread 58. The thread 58 enables the end 24 of the inner drive shaft member 23 to be connected to a drive member 60 which, in use, facilitates connection of the drive spindle 34 to the drive shaft 12. The drive member 60 differs from the prior art in that it is not provided with a bayonet slot. In the embodiment shown the end 24 of the drive shaft member 23 having the thread is tapered. In an alternative embodiment the end 24 may 30 not be tapered. 4161985_1 (GMatters) P92963.AU 15/03/13 -6 The drive member 60 is tubular having a through bore 62. A lower region 64 of the through bore 62 is provided with a complementary thread 66 to the thread 58 of the drive shaft end 24. This permits the drive shaft 12 to be connected to the drive member 60 as shown in figures 3 and 4. The upper region 68 of the through bore 62 is provided with a 5 complementary thread 70 to the coarse thread 54 of the drive spindle 34. The upper region 68 of the through bore 62 is further provided with a substantially frusto-conical drive face 72 which matches the taper of the substantially frusto conical drive face 56 of the drive spindle 34. 10 The drive member 60 is further provided at its lower end 74 with an external flange 76. The diameter of the flange 76 is slightly less than the internal diameter of the sleeve 28, and thus the drive member 60 is able to both move axially within the sleeve 28 and rotate relative to the sleeve 28. The underside of the flange 76, which is to say the side of the flange 76 opposite to the thread 70 and frusto-conical drive face 72 of the through bore 15 62, defines an abutment surface 77 of the drive member 60. The sleeve 28 further receives the coil spring 78 which is retained in the sleeve 28 by the lower clamp arrangement 46. In the situation where the drive shaft 12 is connected to a drive motor 32 that is not activated, or when the drive shaft 12 is not connected to a drive motor 32, the abutment surface 77 of the flange 76 of the drive member 60 abuts the spring 78 and 20 prevents the drive member 60 from falling out of the sleeve 28. The upper end of the spring 78 thus defines a support surface 79. It will be appreciated that the support surface 79 may be defined by an alternative feature of the drive shaft 12. For example, the support surface 79 may be defined by an interior feature of the sleeve 28. 25 In order to connect the drive shaft 12 to the drive spindle 34, the sleeve 28 is aligned with the drive spindle 34, and then advanced over the drive spindle 34 and drive spindle boss 38 until the forward edge 80 of the sleeve 28 abuts an annular step 82 of the boss 38. Depending upon the relative alignment of the drive spindle thread 54 with the drive member thread 70, when the sleeve 28 is advanced, the drive spindle 34 may be partially 30 received in the through bore 62 of the drive member 60 as indicated in figure 3 due to the partial engagement of the threads 54,70. 4161985_1 (GHMatters) P92963.AU 15/03/13 -7 Alternatively, if the respective threads 54,70 are misaligned, then a chamfer 71 provided on the distal end of the drive spindle 34 engages the frusto conical drive face 72 of the drive member 60 and guides the threads into engagement. In exceptional circumstances, partial rotation of the sleeve 28 may be required in order to align and engage the threads 5 54,70 as the sleeve 28 is advanced over the boss 38. With the respective threads 54,70 partially engaged as shown in figure 3 and the drive motor deactivated, the flange 76 of the drive member 60 rests against the upper end of the spring 78. Actuation of the drive spindle 34 causes the drive member 60 to be lifted 10 from the spring 78 and drawn up the drive spindle 34 until the frusto conical drive face 56 of the drive spindle 34 contacts the frusto conical drive face 72 of the drive member 60. The threads 54,70 of the drive spindle 34 and drive member 60 are provided with 15 sufficient clearance that they do not tighten and thus do not bind. The threads 54,70 thus function to move the frusto conical drive faces 56,72 into engagement with one another when the drive motor is operated, and to permit the drive faces 56,72 to move out of engagement in an ordered manner when the drive motor ceases operation. The taper angle of the drive faces 56,72 is chosen such that they do not lock in the manner of a 20 Morse taper, but are able to disengage when the drive spindle 34 is de-activated, for example by switching off of the drive motor. When the drive spindle 34 is de-activated, it will be appreciated that the rotational speed of the drive spindle 24 will decrease. The inherent inertia of the drive shaft 12,16 and drive member 60 will ensure that the rotational speed of the drive shaft 12,16 and drive member 60 decreases at a slower rate 25 than the drive spindle 34. This results in rotation of the drive member 60 relative to the drive spindle 34, with the further result that the drive faces 56,72 separate as the threads 54,70 are moved relative to one another. It will further be appreciated that the action of gravity on the inner drive shaft member 23 further assists in the separation of the threads 54,70. The threads 54,70 separate until the flange 76 of the drive member 60 rests upon 30 the upper end of the spring 78. 4161985_1 (GHMatters) P92963.AU 15/03/13 -8 The clamp arrangements 40,46 may include over centre cam mechanisms which, in use, may be used to clamp the sleeve to the drive spindle boss 38 and coil spring 78 respectively. In an alternative embodiment, the upper clamp arrangement 40 may include an over centre cam mechanism and the lower clamp arrangement 46 may include 5 a hexagon nut or wing nut and a bolt. It will be appreciated that the lower clamp arrangement 46 will need to be adjusted very infrequently, if ever, after the position of the spring 78 within the sleeve 28 has been set in the factory. The upper clamp arrangement 40, on the other hand, will typically require frequent manipulation to connect and disconnect the drive shaft 12. 10 In the embodiment shown, the flange 76 abuts the upper edge of the spring when the drive motor is not activated. It will be appreciated that the flange 76 may alternatively abut an internal feature of the sleeve 28, for example a flange or seat of the sleeve 28. 15 The present invention thus eliminates the prior art two step procedure for fitting a drive shaft to the drive spindle of a drive motor. The present invention further eliminates the need for a bearing within the sleeve which rotationally supports the inner member of the drive shaft. It will further be appreciated that, depending upon the operational state of the motor, the drive member of the drive shaft moves between a position where the frusto 20 conical drive faces are in engagement and the abutment surface is separated from the support surface, and a position where the frusto conical drive faces are separated and the abutment surface is in contact with the support surface. In the claims which follow and in the preceding description of the invention, except 25 where the context requires otherwise due to express language or necessary implication, the word "comprise" or variations such as "comprises" or "comprising" is used in an inclusive sense, i.e. to specify the presence of the stated features but not to preclude the presence or addition of further features in various embodiments of the invention. 30 It is to be understood that, if any prior art publication is referred to herein, such reference does not constitute an admission that the publication forms a part of the common general knowledge in the art, in Australia or any other country. 4161985_1 (OHMatters) P92963.AU 15/03/13
    权利要求:
    Claims (17)
    [1] 1. A drive connection for connecting the drive shaft of a shearing hand piece to the drive spindle of a drive motor, the drive spindle being provided with a distal threaded 5 portion and a proximal tapered portion, the drive shaft having an inner drive shaft member being provided with an recessed end having a complementarily tapered distal portion and a complementarily threaded proximal portion, wherein, in use, the tapered portions of the drive spindle and inner drive shaft member are in contact with one another when the drive motor is in operation and are separated from one another when 10 the drive motor is not in operation, the drive shaft further being provided with a sleeve which, in use, receives the drive spindle end and further connects to a connection feature of the drive motor to releasably retain the drive shaft in association with the drive motor, wherein the sleeve is provided with a support surface against which an abutment surface the inner drive shaft member end is able to rest when the drive motor is not in operation 15 and the tapered portions are separated from one another, wherein further the support surface and abutment surface co-operate to retain the inner drive shaft member within the sleeve when the drive motor is not in operation.
    [2] 2. A drive connection as claimed in claim I wherein the end of the inner drive shaft 20 member is defined by an attachment having the complementarily tapered distal portion, the complementarily threaded proximal portion and the abutment surface.
    [3] 3. A drive connection as claimed in claim 2 wherein the attachment is substantially tubular. 25
    [4] 4. A drive connection as claimed in claim 3 wherein connection of the attachment to the inner drive shaft member is achieved by the engagement of a thread provided on the end to the inner drive shaft member to a complementary thread of the tubular attachment. 30
    [5] 5. A drive connection as claimed in any of claims 2 to 4 wherein the abutment surface of the tubular attachment is a peripheral flange of the tubular attachment. 41619851 (GHMatters) P92963.AU 15/03/13 - 10
    [6] 6. A drive connection as claimed in any preceding claim wherein the support surface of the sleeve is defined by a feature of the inner surface of the sleeve.
    [7] 7. A drive connection as claimed in any of claims I to 5 wherein the support surface 5 of the sleeve is defined by a member which is retained within the sleeve.
    [8] 8. A drive connection as claimed in claim 7 wherein the support surface is defined by a spring retained within the sleeve. 10
    [9] 9. A shearing hand piece drive motor having a drive spindle, the drive spindle having a distal threaded portion and a proximal tapered portion, said threaded and tapered portions being configured to, in use, connect to complementarily tapered and threaded portions of a drive shaft. 15
    [10] 10. A shearing hand piece drive shaft, the drive shaft having an inner drive shaft member being provided with an end with a recess, the recess having a tapered distal portion and a threaded proximal portion, said tapered and threaded portions being configured to, in use, connect to a complementarily tapered and threaded portions of a drive spindle of a drive motor, wherein, in use, the tapered portions of the drive spindle 20 and inner drive shaft member are in contact with one another when the drive motor is in operation and are separated from one another when the drive motor is not in operation, the drive shaft further being provided with a sleeve which surrounds said end of the inner drive shaft member and has a support surface against which an abutment surface of the inner drive shaft member is able to rest when the drive motor is not in operation and the 25 tapered portions are separated from one another, wherein further the support surface and abutment surface co-operate to retain the inner drive shaft member within the sleeve when the drive motor is not in operation.
    [11] 11. A shearing hand piece drive shaft as claimed in claim 10 wherein the end of the 30 inner drive shaft member is defined an attachment having the tapered distal portion, the threaded proximal portion and the abutment surface. 4161985_1 (GHMatters) P92963.AU 15/03/13 - 11
    [12] 12. A shearing hand piece drive shaft as claimed in claim 11 wherein the attachment is substantially tubular.
    [13] 13. A shearing hand piece drive shaft as claimed in claim II or claim 12 wherein 5 connection of the attachment to the inner drive shaft member is achieved by the engagement of a thread provided on the end to the inner drive shaft member to a complementary thread of the tubular attachment.
    [14] 14. A shearing hand piece drive shaft as claimed in claim 13 wherein the abutment 10 surface of the tubular attachment is a peripheral flange of the tubular attachment.
    [15] 15. A shearing hand piece drive shaft as claimed in any of claims 10 to 14 wherein the support surface of the sleeve is defined by a feature of the inner surface of the sleeve. 15
    [16] 16. A shearing hand piece drive shaft as claimed in any of claims 10 to 14 wherein the support surface of the sleeve is defined by a member which is retained within the sleeve.
    [17] 17. A shearing hand piece drive shaft as claimed in claim 16 wherein the support 20 surface is defined by a spring retained within the sleeve. 4161985_1 (GHMatters) P92963.AU 15/03/13
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    同族专利:
    公开号 | 公开日
    AU2013201563B2|2016-09-08|
    GB201204563D0|2012-05-02|
    GB2502185B|2017-08-23|
    GB201304733D0|2013-05-01|
    GB2502185A|2013-11-20|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US2150352A|1937-01-06|1939-03-14|Chicago Flexible Shaft Co|Shearing machine|
    US2328602A|1939-12-30|1943-09-07|Bechler Andre|Device for the axial coupling of two cylindrical parts by means of threads|
    GB562138A|1942-12-11|1944-06-20|Eric Johnson Timberlake|Improvements in or relating to shaft couplings|
    US2645944A|1948-04-19|1953-07-21|Crichton Company|Power take-off system and apparatus|
    EP0482929A1|1990-10-26|1992-04-29|Briggs & Stratton Corporation|Power takeoff adapter for drive shaft|
    法律状态:
    2017-01-12| FGA| Letters patent sealed or granted (standard patent)|
    2021-10-14| MK14| Patent ceased section 143(a) (annual fees not paid) or expired|
    优先权:
    申请号 | 申请日 | 专利标题
    GBGB1204563.9A|GB201204563D0|2012-03-15|2012-03-15|Improved drive connection|
    GB1204563.9||2012-03-15||
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