• 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:
    The invention relates to a power tool comprising a motor (14), a cutting member (26) and a transmission (16, 20, 22) connecting the cutting member to the motor, the motor and the transmission being housed in a housing. main casing (10), the transmission comprising a ball screw-nut mechanism (20) with a screw (42) and a nut (40), one of the screw and the nut being integral in rotation with the motor, and the other of the screw and the nut being connected to the cutting member, according to the invention, the tool comprises a protective casing (50) of the screw nut mechanism, separate from the main casing , and a sliding joint (52) cooperating with an inner face of the protective casing (50), the sliding joint being driven by one of the nut (40) and the screw (42) connected to the chopped off.
    公开号:FR3028717A1
    申请号:FR1461406
    申请日:2014-11-25
    公开日:2016-05-27
    发明作者:Roger Pellenc
    申请人:Pellenc SAS；
    IPC主号:
    专利说明:

    [0001] i Power tool with protected transmission. TECHNICAL FIELD The present invention relates to a power tool, and in particular a pruner used for pruning and harvesting, especially for the size of vines and fruit trees. More generally, the invention can also find applications to tools comprising a linear displacement actuator with a ball screw-nut mechanism. A ball screw-nut mechanism is understood to mean a mechanism capable of transforming the rotational movement of an engine, and in particular an electric motor, with a minimum of energetic losses into a translational movement. State of the prior art. The state of the art is described with reference to electric secateurs. The technical problems encountered in the state of the art are however not limited to pruners and can meet with other comparable tools such as sheet shears, for example. The secateurs electric have a general structure with a motor, a cutting member and a transmission connecting the motor to the cutting member. The term "transmission" here refers to all the parts that transmit the movement of the motor to the cutting member. The transmission may include in particular a gearbox mounted on the output shaft of the motor, and a ball screw-nut mechanism driven by the gearbox. The screw-nut mechanism ball is formed of a screw and a nut that cooperate with each other through balls circulating in a ball path. The ball path is formed by complementary threads of the nut and the screw. The rotational movement of the screw thus causes a translation of the nut along the screw and parallel to the axis of the screw. The direction of movement of the nut depends on the direction of rotation of the screw.
    [0002] The translation movement of the nut is used to drive the cutting member. In the case of a pruner, the cutting member generally comprises a fixed blade and a movable blade. The movable blade is mounted on a pivot and can thus pivot between an open position and a closed position on the fixed blade. The transmission comprises for this purpose rods which connect the movable blade to the nut of the screw-nut mechanism mentioned above. The engine and transmission are housed in a main housing, which, in the case of secateurs, also serves as a handle. However, since the housing serves as a handle, the dimensioning of the internal parts, in particular of the motor and of the transmission, must be adapted, and preferably reduced, so as to guarantee a comfortable gripping of the tool. The cutting member, and in particular the blades are mounted at the front of the main housing. The fixed blade and the pivot of the movable blade are generally screwed on the main housing.
    [0003] The general shape of the casing in the vicinity of the cutter is configured to best protect the internal members of the housing. It is configured especially to protect the transmission, dust or debris generated by cutting. However, it is difficult to exactly fit the main housing on the blades of the cutter so as not to impede their movement. Also, we see that debris, sand or dust gradually contaminate the transmission organs. In particular, debris, sand or dust may come into contact with the ball screw-nut mechanism and agglomerate there particularly with the lubricant of the mechanism. Debris, sand or cutting dust may thus be entrained in the raceway of the balls and cause rapid wear or blockage of the screw-nut mechanism. Another risk is to blow up the balls of a ball recycling system provided in the nut. WO2013 / 164310 discloses a shears provided with a guide system with a guide ring integral with the screw nut. The guide ring slides inside the body of the tool, which is cylindrical, so as to relieve the transmission of lateral forces. The guide ring is used to clean the inner surface of the tool body. Such a configuration protects, at least in part, the transmission of debris or cutting dust. However, it requires a precise conformation of the body of the tool, that is to say from the main casing to the guide ring over the entire path covered by the latter. SUMMARY OF THE INVENTION The object of the present invention is to simply provide absolute protection for the transmission of power tools against debris and cutting dust.
    [0004] Another object is to provide such protection which does not involve the body of the tool, and which does not require a particular conformation of its housing. Another object is to provide such a protection that can be verified and tested before assembly of the tool and in particular before mounting the subassembly formed by the motor and the transmission in the housing of the tool. Also, the invention proposes a power tool comprising a motor, a cutting member and a transmission connecting the cutting member to the motor, the motor and the transmission being housed in a main housing, the transmission comprising a screw mechanism. ball nut in which one of the screw and the nut is rotatably connected to the motor, and the other of the screw and the nut is connected to the cutting member. According to the invention the tool also comprises a protective casing of the ball nut screw mechanism, separate from the main casing, and a sliding seal cooperating with an inner face of the protective casing, the sliding seal being driven by one of the nut and the screw connected to the cutter. The protective cover, associated with the sliding joint, forms an enclosed space and protects the screw from any dirt. Also the sealing of the seal means as a seal against soils such as dust, cutting debris, or grains of sand may degrade quickly or progressively the operation of the ball screw-nut mechanism. . The protective housing also protects the nut, and the raceway of the balls. It may have a preferably circular, oval or oblong section. The fact that the seal is driven by the part of the 5-ball screw-nut mechanism connected to the cutting member, i.e. the translating part, allows the seal to accompany movement without movement. break the seal. As mentioned previously, the guard is separate from the main housing of the tool. This feature is advantageous in more ways than one. Firstly, it makes it possible to conform and dimension the protection casing 10 in an optimum manner with respect to the screw-and-ball nut mechanism, and in particular with respect to the seal. Indeed, this conformation can be done independently of that of the main housing that is to say the body of the tool. This measurement is particularly interesting not only for the production of the protective casing but also, and above all, for the production of the main casing. The shape of the main casing is not subject to any dust protection function and can be determined according to other requirements, especially when the body of the tool serves as a handle. The shape of the main casing may in particular be designed to provide aeration, technical access for blow cleaning, or the passage of electrical wires, without interfering with the transmission. The main casing simply has forms adapted to support and maintain the screw-nut mechanism ball. This allows its realization by simple molding, without subsequent machining, to receive the mechanism and in particular the protective casing.
    [0005] Finally, the use of a protective casing separate from the main casing makes it possible to protect the screw as soon as a subassembly formed by the motor and the transmission is assembled and before the integration of this subassembly into the casing. main casing. This particularity allows in particular a functional control of this subassembly before assembly in the main casing by limiting the risks of incorporating foreign bodies at the level of the ball screw at this stage of manufacture.
    [0006] The guard can be configured to be removably received in the main housing. This protects the screw and the nut in case of disassembly of the tool, for example during a maintenance or cleaning operation.
    [0007] In order to convert the rotational movement of the motor into a translational movement, one of the screw and the nut is connected to the motor or, where appropriate, to a gearbox associated with the motor, and is rotated. The other of the screw and the nut, which is then driven by a translation movement is connected to the cutting member.
    [0008] In a particular embodiment of the invention, the screw is rotated by the motor or gearbox and the nut is connected to the cutting member. The screw can be secured to the motor shaft or mounted on the gearbox. In this case, the nut, which is connected to the cutting member is provided with the sliding joint in the protective housing. The gasket may be formed directly on the nut or possibly on a sleeve which cap the nut. The seal is for example a lip seal with a lip attached to the sleeve or formed integrally with the sleeve. Furthermore, and to complete the protection of the transmission and in particular to protect a face of the ball nut turned away from the motor, 20 this face can be provided with a protective sleeve. The protective sleeve protects a portion of the screw protruding from the nut as the nut moves along the screw. It also protects the face of the nut turned away from the motor and is not surrounded by the guard. The bushing thus prevents the penetration of debris or dust into the rolling path of the balls by this face. The protective sleeve is rigidly mounted on the nut and has a diameter preferably adjusted to that of the screw. The diameter can be chosen slightly higher than that of the screw to avoid any friction. The rigid mounting of the sleeve on the nut ensures the concentricity of the sleeve relative to the screw and thus maintain a reduced clearance 30 with the screw without generating friction.
    [0009] The length of the protective sleeve is preferably adapted to the length of the section of the screw that may protrude from the nut when the nut is at the end of travel toward the motor. The bushing may be designed to partially extend into the nut so as to effectively protect the raceway of the balls. Like the protective casing, the socket can be made of metal, plastic or a composite material. The socket may be provided with at least one vent. A vent is particularly useful when the diameter of the bushing is adjusted on the screw. It makes it possible to avoid an overpressure or a temporary depression in the bushing following a rapid displacement of the nut. Tie rods or equivalent mechanism connect the nut to the cutter. They are preferably formed on either side of the sleeve.
    [0010] In another embodiment of the invention, the nut is mounted on the motor shaft or on the outlet of the gearbox so as to be rotated. The screw, which is then moved in a translation movement, is connected to the cutting member by one or more rods or by an equivalent mechanism. In this case, the sliding joint is secured to the screw and preferably a yoke 20 of the screw slidable between the nut and the protective housing. The seal may comprise a lip mounted, for example, in the vicinity of one end of the yoke facing the engine. The lip can also be formed in one piece with the screed. The protective cap preferably has a circular section 25 adapted to the nut also circular. It is attached to the free end of the screw, that is to say the end connected to the cutting member. The rods mentioned above can be mounted on the yoke or directly on the screw.
    [0011] Other features and advantages of the invention appear from the following description with reference to the drawings of the figures. This description is given by way of illustration and not limitation. Brief Description of the Figures Figure 1 is a longitudinal section of an electric pruner according to the invention, with a cutter in the open position. FIG. 2 is a sectional view of the pruner of FIG. 1, in the closed position of the not shown cutter, along a sectional plane passing through the screw of the ball screw-nut mechanism, and perpendicular to the section plane; Figure 3 is a longitudinal section of the pruner of Figure 1 with the cutter in the closed position. Figure 4 is a longitudinal section of an electric pruner according to the invention according to an alternative embodiment of the invention.
    [0012] DETAILED DESCRIPTION OF EMBODIMENTS OF THE INVENTION In the description which follows, identical or similar parts of the different figures are marked with the same reference signs so that it is easier to refer from one figure to the other. .
    [0013] Figure 1 shows a power tool and more specifically a pruner according to the invention. It should be noted that the pruner of Figure 1 is an electric pruner remote power supply. The remote power supply includes an accumulator battery that the user can wear at the belt or back, and which is connected to the pruner by a power cord. The power cord and the battery pack do not appear in the figures for the sake of simplicity.
    [0014] The pruner comprises a main housing 10 in which are housed in order, a connector 12 for connecting the secateur to its power supply, a rotary electric motor 14, a gearbox 16, mounted on the motor shaft, a mechanism 20. screw-nut ball, and rods 22.
    [0015] The rods 22, the ball screw-nut mechanism 20, and the reducer are part of the secateur transmission. The transmission is understood as all the members that communicate the movement of the motor to the cutting member 26. The cutting member 26 comprises a blade 28 fixed and rigidly fixed to the housing by means of screws 30. It also comprises a movable blade 32, connected to the housing via a pivot 34. The movable blade 32 is provided with a cam 36 connected to the ball screw-nut mechanism 20 via links 22. A single link is visible in Figure 1. The rods 22 are more specifically connected to a nut 40 of the mechanism 15 screw-nut ball 20, by an articulation not visible in the figure. The nut 40 has a thread which cooperates with a corresponding thread of a screw 42 by means of balls. The threads of the nut 40 and the screw 42 constitute a raceway 44 for the balls which transmit the forces of movement of the screw towards the nut. The balls are not shown in the figure. They are held inside the screw by a recirculation system known per se. The screw 42 is rotatably connected to the gearbox 16 and therefore the motor 14. The rotation of the screw 42 causes the displacement of the nut 40 along the screw, parallel to its axis, in a translational movement. The rotation of the screw moves the nut from a first extreme position close to the gearbox to a second extreme position at the free end of the screw. The direction of movement of the nut between these two extreme positions depends on the direction of rotation of the screw, and therefore the motor. The movement of the nut 40 from its first extreme position to its second extreme position causes the movable blade 32 to pivot from its closed position to an open position. The open position is that shown in Figure 1.
    [0016] The movement of the movable blade between the open and closed positions is controlled by means of a trigger 46 and an electronic control card 48. The movement of the blade and the cutting of plants causes debris and dust, which, despite an adjusted configuration of the housing in the vicinity of the cutter, eventually accumulate in an internal housing housing 10 around the transmission members, and particularly around the mechanism of screw ball nut. In order to prevent the debris and dust from impeding the movement of the ball screw-nut mechanism, the pruner of FIG. 1 comprises in particular a protective casing 50. The latter surrounds the screw 42 along all or part of the race of the nut 40. The protective casing is preferably cylindrical. It is dimensioned so as to be able to receive the nut especially during its race towards the reducer.
    [0017] A sliding joint 52 of the nut 40, with a sealing lip, cooperates with the inner face of the protective casing 50 so that no dust or impurity can reach the part of the screw located inside the housing. safety cover. The protective casing, associated with the lip, also protects the inner face of the nut 40, that is to say the face facing the motor. These measurements 20 also put the portion of the raceway 44 balls opening inside the protective housing away from dirt. When the nut moves towards the gearbox 16, that is to say towards its first extreme position, a portion of the screw 42 protrudes from the external face of the nut, that is to say the face turned towards the cutting tool 26. To also protect the screw 42 in this position of the nut, as well as the outer face of the nut, the latter is provided with a protective sleeve 60. The bushing protection has, like the guard, a function of preserving the screw and nut debris and cutting dust. The protective sleeve 60, better visible in FIG. 2, comprises a sleeve 62 which partly fits into the nut 40. The sleeve is held on the nut by tabs 66 mounted on flexible blades 64 of the sleeve 60. The tabs engage in an internal groove 68 of the nut. It can be seen in FIG. 2 that the diameter of the protective sleeve 60 is adjusted to the diameter of the screw 42. A slight clearance can be preserved so as to avoid friction of the screw in the socket. Friction is also avoided due to a rigid attachment of the sleeve to the nut, which keeps the bushing concentric to the screw. The rigid attachment is provided by the sleeve 62 in particular. The protective sleeve 60 is provided at its end with a vent 70. The vent makes it possible to avoid a phenomenon of compression or of depression in the bushing during the displacement of the nut, in particular because of the character fitted to the bushing. diameter of the screw 42. Figure 2 also shows that the lip of the seal 52 of the nut 40 is integral with a sleeve 54 which cap the end of the nut on the side of its inner face. In the illustrated example, the sleeve is held on the nut by means of a rib 56 engaged with a groove 58 of the nut. The lip 52 can be made in one piece with the sleeve, or attached to the sleeve, as shown in the figure. The lip and the sleeve are preferably made of elastic plastic material, for example a polymer. As the nut 40 moves, the lip of the seal 52 scrapes the inner face of the guard 50 so as to leave it free of dust. The positon of the nut 40 shown in Figure 2 corresponds to the movable blade in the closed position. It can be observed that, in this extreme position, the nut is entirely received in the protective casing. It can also be observed that the links 22 which connect the nut to the movable blade, not shown in FIG. 2, are designed to provide a passage for the bushing 60. The links are connected to the nut 40 via 23. Figure 3, comparable to Figure 1 described above, shows the secateurs with the blade in a closed position. The nut 40 is in its extreme position at the bottom of the protective casing, adjacent to the gearbox 16, and the screw 42 3028717 11 extends inside the bushing 60. The length of the bushing is adapted to the portion of the screw protruding from the nut in this position. FIG. 4 shows another possibility of implementing the invention in which the nut 40 is directly rotatably mounted on the gearbox 16 and rotated by the gearbox. Screw 42, which is not engaged with the motor or gearbox, does not rotate. It is simply driven in translation under the effect of the rotation of the nut. The end of the screw is connected by rods 22 to the cam 36 of the movable blade 32. A cylindrical yoke 80, also attached to the end of the screw 42 surrounds the screw and extends to 10 in the housing protection 50. One end 82 of the yoke is provided with a seal 52, in the form of a lip, which comes into contact with the inner face of the protective casing 50. The inner diameter of the yoke can be adjusted to the diameter outside of the nut 40, especially when the nut is also cylindrical. However, and preferably, sufficient clearance is left between the yoke 80 and the body of the nut 40 so as to avoid friction. An end of the protective housing 50 facing the motor can be closed by a fixed wall 51. The wall has a passage for the nut 40 and provides sufficient clearance to avoid friction of the housing on the rotating nut. A rotary joint may optionally be provided between the fixed wall 51 of the housing and the nut. However, the usefulness of such a seal is reduced insofar as the protective casing is received in the main casing and the fixed wall 51 is not exposed to debris likely to come from the cutting member 26. the example of the figure secateur is shown with the pivoting blade 32 in the open position. The screw 42 occupies an end position, in which it extends mainly out of the nut. The seal 52 is then in the vicinity of one end of the protective casing 50 turned towards the cutting member 26. Conversely, when the pivoting blade 32 is closed on the fixed blade 28, the yoke 80 and the seal 52 are brought closer to the fixed wall 51 of the bottom of the casing 50. The clevis 80 may comprise at its end a vent 70. The vent makes it possible to avoid a phenomenon of compression or depression in the bushing during the displacement of the screw 42.
    权利要求:
    Claims (15)
    [0001]
    REVENDICATIONS1. Power tool comprising, a motor (14), a cutter (26) and a transmission (16, 20,22) connecting the cutter to the motor, the motor and the transmission being housed in a main housing (10) , the transmission comprising a ball screw-nut mechanism (20) with a screw (42) and a nut (40), one of the screw and the nut being integral in rotation with the motor, and the other of the screw and the nut being connected to the cutting member, characterized by a protective casing (50) of the ball nut screw mechanism, separate from the main casing, and by a sliding joint (52) cooperating with a face internal of the protective casing (50), the sliding joint being driven by one of the nut (40) and screw (42) connected to the cutting member.
    [0002]
    2. Power tool according to claim 1 wherein the screw (42) is integral in rotation with the motor (14) and wherein the sliding joint is formed on the nut.
    [0003]
    3. power tool according to claim 1 wherein the screw (42) is integral in rotation with the motor (14) and wherein the sliding joint is formed on a sleeve covering the nut.
    [0004]
    4. power tool according to one of the preceding claims wherein the screw (42) is integral in rotation with the motor (14) and further comprising a sleeve (60) for protecting the screw, rigidly mounted on a face of the nut opposite to the motor.
    [0005]
    The power tool of claim 4, wherein the bushing (60) extends partially into the nut.
    [0006]
    The power tool of claim 4, wherein the socket (60) is provided with a vent (70). 3028717 13
    [0007]
    7. Power tool according to claim 1, wherein the nut (40) is integral in rotation with the motor and wherein the seal (52) is integral with a yoke (80) for protecting the screw, the protective yoke. slidable between the nut and the guard. 5
    [0008]
    8. Power tool according to claim 7, wherein the yoke (80) is connected to one end of the screw facing the cutting member.
    [0009]
    The power tool according to any one of the preceding claims wherein the seal (52) is a lip seal.
    [0010]
    A power tool as claimed in any one of the preceding claims wherein the protective housing (50) has a section selected from a cylindrical section, an oval section and an oblong section.
    [0011]
    11. Power tool according to one of the preceding claims, wherein the transmission comprises a gearbox (16) mounted on a motor shaft, one of the screw and the nut being respectively mounted on the gear. 15
    [0012]
    The power tool according to claim 11, wherein the protective casing is mounted on the reducer (16).
    [0013]
    Power tool according to one of the preceding claims, wherein the protective housing (50) is removably received in the main housing (10). 20
    [0014]
    A power tool according to any one of the preceding claims, comprising links (22) connecting one of the nut and the screw to a cam of a movable blade of the cutter (26).
    [0015]
    15. Power tool according to any one of the preceding claims, characterized in that the tool is a pruner. 25
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    同族专利:
    公开号 | 公开日
    FR3028717B1|2017-03-31|
    BR112017007575A2|2018-01-30|
    JP2021052778A|2021-04-08|
    JP2017536137A|2017-12-07|
    ES2781187T3|2020-08-31|
    US10098284B2|2018-10-16|
    WO2016083696A1|2016-06-02|
    KR20170089907A|2017-08-04|
    PT3223599T|2020-04-09|
    EP3223599B1|2020-01-15|
    PL3223599T3|2020-06-15|
    CN106998654A|2017-08-01|
    EP3223599A1|2017-10-04|
    US20170238472A1|2017-08-24|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    WO2013011230A1|2011-07-19|2013-01-24|Mage Application|Portable electromechanical tool|
    WO2013164310A1|2012-05-04|2013-11-07|Felco Motion Sa|Handheld power tool|
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    US5906136A|1993-06-21|1999-05-25|Nsk Ltd.|Ball screw lubricated with oil-containing polymer|
    EP1477707A1|2003-05-16|2004-11-17|Umbra Cuscinetti S.p.A.|Ball screw|
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    JP5034348B2|2006-07-20|2012-09-26|マックス株式会社|Electric scissors|
    DE102012019227B4|2012-10-01|2019-01-10|Thyssenkrupp Presta Aktiengesellschaft|Ball screw and power steering with a ball screw drive|
    FR3028714B1|2014-11-25|2017-03-31|Pellenc Sa|SCREW MECHANISM AND BALL NUT.|
    FR3028717B1|2014-11-25|2017-03-31|Pellenc Sa|ELECTROPORTATIVE TOOL WITH PROTECTED TRANSMISSION.|
    DE102015104484B4|2015-03-25|2016-12-22|A. Mannesmann Maschinenfabrik Gmbh|Four-stage telescopic actuator with screw drive|
    KR101783100B1|2015-10-05|2017-09-28|주식회사 만도|Rack Assist Type Electric Power Steering Apparatus|
    JP6790572B2|2016-08-12|2020-11-25|株式会社ジェイテクト|Steering device|FR3028717B1|2014-11-25|2017-03-31|Pellenc Sa|ELECTROPORTATIVE TOOL WITH PROTECTED TRANSMISSION.|
    CN107971559B|2017-11-16|2020-07-14|北京航天自动控制研究所|High-power-to-weight ratio full-electric clamping device|
    CN108184470A|2018-01-11|2018-06-22|厦门大学|A kind of altitude pruning scissors|
    CN109392459A|2018-12-05|2019-03-01|凤台县年丰农业发展有限责任公司|A kind of high-efficient grape picker|
    CN111279908A|2020-04-10|2020-06-16|漆建平|Forestry lopping device|
    法律状态:
    2015-11-17| PLFP| Fee payment|Year of fee payment: 2 |
    2016-05-27| PLSC| Search report ready|Effective date: 20160527 |
    2016-09-30| PLFP| Fee payment|Year of fee payment: 3 |
    2017-11-27| PLFP| Fee payment|Year of fee payment: 4 |
    2019-11-25| PLFP| Fee payment|Year of fee payment: 6 |
    2020-11-25| PLFP| Fee payment|Year of fee payment: 7 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1461406A|FR3028717B1|2014-11-25|2014-11-25|ELECTROPORTATIVE TOOL WITH PROTECTED TRANSMISSION.|FR1461406A| FR3028717B1|2014-11-25|2014-11-25|ELECTROPORTATIVE TOOL WITH PROTECTED TRANSMISSION.|
    CN201580063694.6A| CN106998654A|2014-11-25|2015-11-03|Portable power tool with shielded transmission device|
    BR112017007575-0A| BR112017007575A2|2014-11-25|2015-11-03|portable transmission protected tool|
    KR1020177017621A| KR20170089907A|2014-11-25|2015-11-03|Hand-held power tool with protected transmission|
    EP15804877.7A| EP3223599B1|2014-11-25|2015-11-03|Hand-held power tool with protected transmission|
    PT158048777T| PT3223599T|2014-11-25|2015-11-03|Hand-held power tool with protected transmission|
    US15/513,296| US10098284B2|2014-11-25|2015-11-03|Hand-held power tool with protected transmission|
    PCT/FR2015/052966| WO2016083696A1|2014-11-25|2015-11-03|Hand-held power tool with protected transmission|
    JP2017546048A| JP7028644B2|2014-11-25|2015-11-03|Portable power tool with a protected power transmission device|
    PL15804877T| PL3223599T3|2014-11-25|2015-11-03|Hand-held power tool with protected transmission|
    ES15804877T| ES2781187T3|2014-11-25|2015-11-03|Protected Transmission Power Tool|
    JP2020203291A| JP2021052778A|2014-11-25|2020-12-08|Hand-held power tool with protected transmission|
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