EP3022019B1 - Perceuse à percussion - Google Patents

Perceuse à percussion Download PDF

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Publication number
EP3022019B1
EP3022019B1 EP14832514.5A EP14832514A EP3022019B1 EP 3022019 B1 EP3022019 B1 EP 3022019B1 EP 14832514 A EP14832514 A EP 14832514A EP 3022019 B1 EP3022019 B1 EP 3022019B1
Authority
EP
European Patent Office
Prior art keywords
handle
axis
power tool
rotary power
housing
Prior art date
Legal status (The legal status 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 status listed.)
Active
Application number
EP14832514.5A
Other languages
German (de)
English (en)
Other versions
EP3022019A1 (fr
EP3022019A4 (fr
Inventor
Andrew R. Wyler
Jeremy R. Ebner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Milwaukee Electric Tool Corp
Original Assignee
Milwaukee Electric Tool Corp
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
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Application filed by Milwaukee Electric Tool Corp filed Critical Milwaukee Electric Tool Corp
Publication of EP3022019A1 publication Critical patent/EP3022019A1/fr
Publication of EP3022019A4 publication Critical patent/EP3022019A4/fr
Application granted granted Critical
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/04—Handles; Handle mountings
    • B25D17/043—Handles resiliently mounted relative to the hammer housing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2211/00—Details of portable percussive tools with electromotor or other motor drive
    • B25D2211/06—Means for driving the impulse member
    • B25D2211/068—Crank-actuated impulse-driving mechanisms

Definitions

  • the present invention relates to a rotary power tool according to the preamble of claim 1.
  • a power tool is known from EP 1 674 212 A1 .
  • Rotary hammers typically include a rotatable spindle, a reciprocating piston within the spindle, and a striker that is selectively reciprocable within the piston in response to an air pocket developed between the piston and the striker.
  • Rotary hammers also typically include an anvil that is impacted by the striker when the striker reciprocates within the piston. The impact between the striker and the anvil is transferred to a tool bit, causing it to reciprocate for performing work on a work piece. This reciprocation may cause undesirable vibration that may be transmitted to a user of the rotary hammer.
  • the invention provides a rotary power tool according to claim 1 including a housing, a spindle defining a working axis, and a motor supported by the housing.
  • the motor is operable to drive the spindle.
  • the rotary power tool also includes a handle movably coupled to the housing and a vibration isolating assembly disposed between the housing and the handle.
  • the vibration isolating assembly attenuates vibration transmitted from the housing to the handle.
  • a battery pack is removably coupled directly to the handle and configured to provide power to the motor.
  • FIG 1 illustrates a rotary hammer 260 according to an embodiment of the invention.
  • the rotary hammer 260 includes a housing 262 and a motor 264 disposed within the housing 262.
  • a tool bit 266, defining a working axis 268, is coupled to the motor 264 for receiving torque from the motor 264.
  • the motor 264 receives power from a rechargeable battery pack 270.
  • the motor 264 is a brushless direct-current (“BLDC") motor and includes a stator (not shown) having a plurality of coils (e.g., 6 coils) and a rotor (not shown) including a plurality of permanent magnets. Operation of the motor 264 is governed by a motor control system 265 including a printed circuit board (“PCB”) (not shown) and a switching FET PCB (not shown). Alternatively, the motor 264 can be any other type of DC motor, such as a brush commutated motor.
  • PCB printed circuit board
  • FET PCB switching FET PCB
  • the motor control system 265 controls the operation of the rotary hammer 260 based on sensed or stored characteristics and parameters of the rotary hammer 260.
  • the control PCB is operable to control the selective application of power to the motor 264 in response to actuation of a trigger 272.
  • the switching FET PCB includes a series of switching FETs for controlling the application of power to the motor 264 based on electrical signals received from the control PCB.
  • the switching FET PCB includes, for example, six switching FETs.
  • the number of switching FETs included in the rotary hammer 260 is related to, for example, the desired commutation scheme for the motor 264. In other embodiments, additional or fewer switching FETs and stator coils can be employed (e.g., 4, 8, 12, 16, between 4 and 16, etc.).
  • the design and construction of the motor 264 is such that its performance characteristics maximize the output power capability of the rotary hammer 260.
  • the motor 264 is composed primarily of steel (e.g., steel laminations), permanent magnets (e.g., sintered Neodymium Iron Boron), and copper (e.g., copper stator coils).
  • the illustrated BLDC motor 264 is more efficient than conventional motors (e.g., brush commutated motors) used in rotary hammers.
  • the motor 264 does not have power losses resulting from brushes.
  • the motor 264 also combines the removal of steel from the rotor (i.e., in order to include the plurality of permanent magnets) and windings of copper in the stator coils to increase the power density of the motor 264 (i.e., removing steel from the rotor and adding more copper in the stator windings can increase the power density of the motor 264).
  • Motor alterations such as these allow the motor 264 to produce more power than a conventional brushed motor of the same size, or, alternatively, to produce the same or more power from a motor smaller than a conventional brushed motor for use with rotary hammers.
  • the tool bit 266 is secured to a spindle 274 for corotation with the spindle 274 about the working axis 268 (e.g., using a quick-release mechanism).
  • the rotary hammer 260 further includes an impact mechanism 276 having a reciprocating piston 278 disposed within the spindle 274, a striker 279 that is selectively reciprocable within the spindle 274 in response to reciprocation of the piston 278, and an anvil 280 that is impacted by the striker 279 when the striker 279 reciprocates toward the tool bit 266.
  • the impact between the striker 279 and the anvil 280 is transferred to the tool bit 266, causing it to reciprocate for performing work on a work piece.
  • the spindle 274 and the impact mechanism 276 of the rotary hammer 260 can have any suitable configuration for transmitting rotary and reciprocating motion to the tool bit 266.
  • the rotary hammer 260 further includes a handle 282 having an upper portion 284 and a lower portion 286 coupled to the housing 262 via a vibration isolating assembly 287 including an upper joint 288 and a lower joint 290.
  • the handle 282 has an upper bellows 292 disposed between the upper portion 284 and the housing 262, and a lower bellows 294 disposed between the lower portion 286 and the housing 262.
  • the bellows 292, 294 protect the joints 288, 290 from dust or other contamination.
  • the handle 282 is formed from cooperating first and second handle halves 282a, 282b, and includes an overmolded grip portion 298 to provide increased operator comfort. In other embodiments, the handle 282 may be formed as a single piece or may not include the overmolded grip portion 298.
  • Operation of the rotary hammer 260 may produce vibration at least due to the reciprocating motion of the impact mechanism 276 and intermittent contact between the tool bit 266 and a work piece. Such vibration may generally occur along a first axis 302 parallel to the working axis 268 of the tool bit ( FIG. 3 ). Depending upon the use of the rotary hammer 260, vibration may also occur along a second axis 306 orthogonal to the first axis 302 and along a third axis 310 orthogonal to both the first axis 302 and the second axis 306. To attenuate the vibration being transferred to the handle 282, and therefore the operator of the rotary hammer 260, the upper and lower joints 288, 290 of the vibration isolating assembly 287 each permit limited movement of the handle 282 relative to the housing 262.
  • the handle 282 includes a battery receptacle 414 adjacent the lower portion 286 of the handle 282, proximate the lower joint 290.
  • the battery receptacle 414 defines an insertion axis 416 along which the battery pack 270 is slidable that is oriented substantially parallel to the working axis 268 of the spindle 274 (see also FIG. 1 ).
  • the battery pack 270 is slidable in a forward direction along the insertion axis 416 to insert the battery pack 270 into the receptacle 414 and in a rearward direction along the insertion axis 416 to remove the battery pack 270 from the receptacle 414.
  • the battery pack 270 includes a housing 418 and a plurality of rechargeable battery cells (not shown) supported by the battery housing 418.
  • the battery pack 270 also includes a support portion 426 for securing the battery pack 270 within the battery receptacle 414, and a locking mechanism 430 for selectively locking the battery pack 270 to the battery receptacle 414.
  • the battery pack 270 is designed to substantially follow the contours of the rotary hammer 260 to match the general shape of the handle 282 and housing 262 of the rotary hammer 260 ( FIG. 1 ). Because the battery pack 270 is supported on the handle 282, the vibration isolating assembly 287 also substantially isolates the battery pack 270 from the vibration produced during operation of the rotary hammer 260. The mass of the battery pack 270 adds inertia to the handle 282 which further reduces the vibration experienced by the operator of the rotary hammer 260.
  • the battery cells can be arranged in series, parallel, or a series-parallel combination.
  • the battery pack 270 includes a total 5 of ten battery cells configured in a series-parallel arrangement of five sets of two seriesconnected cells.
  • the series-parallel combination of battery cells allows for an increased voltage and an increased capacity of the battery pack 270.
  • the battery pack 270 can include a different number of battery cells (e.g., between 3 and 12 battery cells) connected in series, parallel, or a series-parallel combination in order to produce a battery pack having a desired combination of nominal battery pack voltage and battery capacity.
  • the battery cells are lithium-based battery cells having a chemistry of, for example, lithium-cobalt ("Li-Co”), lithium-manganese (“Li-Mn”), or Li-Mn spinel.
  • the battery cells can have any other suitable chemistry.
  • each battery cell has a nominal voltage of about 3.6V, such that the battery pack 270 has a nominal voltage of about 18V.
  • the battery cells can have different nominal voltages, such as, for example, between about 3.6V and about 4.2V, and the battery pack 270 can have a different nominal voltage, such as, for example, about 10.8V, 12V, 14.4V, 24V, 28V, 36V, between about 10.8V and about 36V, etc.
  • the battery cells also have a capacity of, for example, between about 1.0 ampere-hours ("Ah") and about 5.0Ah.
  • the battery cells can have capacities of about, 1.5Ah, 2.4Ah, 3.0Ah, 4.0Ah, between 1.5Ah and 5.0Ah, etc.
  • the vibration isolating assembly 287 will now be described in more detail with reference to FIGS. 3-5 .
  • the upper and lower joints 288, 290 of the vibration isolating assembly 287 each permit limited movement of the handle 282 relative to the housing 262 in the directions of the first axis 302, the second axis 306, and the third axis 310 ( FIG. 3 ).
  • the upper and lower joints 288, 290 enable movement of the handle 282 relative to the housing 262 along the first axis 302 between an extended position and a retracted position.
  • the extended position and the retracted position correspond with the respective maximum and minimum relative distances between the handle 282 and the housing 262 during normal operation of the rotary hammer 260.
  • the upper and lower joints 288, 290 are structurally and functionally identical, and as such, only the upper joint 288 is described in greater detail herein. Like components are identified with like reference numerals.
  • the first and second handle halves 282a, 282b each include a front wall 314, a rear wall 318, an upper wall 322, and a lower wall 326 that collectively define a cavity 330 when the first and second handle halves 282a, 282b are attached.
  • the upper joint 288 includes a rod 334 having a distal end 338 coupled to the housing 262, a head 342 opposite the distal end 338, and a shank 346 extending through the cavity 330.
  • the distal end 338 is coupled to the housing 262 by a first, generally T-shaped bracket 350.
  • the bracket 350 includes a rectangular head 354 and a post 358 extending from the head 354.
  • the rod 334 is a threaded fastener (e.g., a bolt), and the post 358 includes a threaded bore 362 in which the threaded end 338 of the rod 334 is received.
  • the rod 334 may be coupled to the bracket 350 in any suitable fashion (e.g., an interference fit, etc.), or the rod 334 may be integrally formed as a single piece with the bracket 350.
  • the bracket 350 is coupled to the housing 262 using an insert molding process. Alternatively, the bracket 350 may be coupled to the housing 262 by any suitable method.
  • the upper joint 288 includes a biasing member 366 disposed between the upper portion 284 of the handle 282 and the housing 262.
  • the biasing member 366 is deformable to attenuate vibration transmitted from the housing 262 along the first axis 302.
  • the biasing member 366 is a coil spring; however, the biasing member 366 may be configured as another type of elastic structure.
  • the upper joint 288 also includes a second, generally T-shaped bracket 370 coupled to the rod 334.
  • the bracket 370 includes a rectangular head 374 and a hollow post 378 extending from the head 374 through which the shank 346 of the rod 334 extends.
  • the head 342 of the rod 334 limits the extent to which the shank 346 may be inserted within the hollow post 378.
  • a sleeve 382 having a generally square cross-sectional shape, surrounds the rod 334 and the posts 358, 378 of the brackets 350, 370 to provide smooth, sliding surfaces 386 ( FIG. 5 ) along the length of the rod 334.
  • the rectangular head 374 of the bracket 370 is configured to abut the rear walls 318 of the respective handle halves 282a, 282b in the extended position of the handle 282 and to be spaced from the rear walls 318 of the respective handle halves 282a, 282b as the handle 282 moves towards the retracted position.
  • the upper joint 288 also includes a first guide 390 and a second guide 394 positioned within the cavity 330 on opposing sides of the sleeve 382.
  • the guides 390, 394 are constrained within the cavity 330 along the first axis 302 by the front and rear walls 314, 318 of the handle halves 282a, 282b such that the guides 390, 394 move with the handle 282 along the sliding surfaces 386 of the sleeve 382 as the handle 282 moves along the first axis 302.
  • a first bumper 398 is disposed within the cavity 330 between the first guide 390 and the first handle half 282a, and a second bumper 402 is disposed within the cavity 330 between the second guide 394 and the second handle half 282b.
  • the bumpers 398, 402 are formed from an elastic material (e.g., rubber) and are deformable to allow the handle 282 to move relative to the housing 262 a limited extent along the second axis 306 (see also FIG. 4 ).
  • the bumpers 398, 402 resist this movement, thereby attenuating vibration transmitted from the housing 262 to the handle 282 along the second axis 306.
  • the upper joint 288 includes a gap 406 between the sleeve 382 and the upper walls 322 of the handle halves 282a, 282b, and another gap 410 between the sleeve 382 and the lower walls 326 of the handle halves 282a, 282b.
  • the gaps 406, 410 allow the guides 390, 394 to slide relative to the sleeve 382 a limited extent along the third axis 310.
  • the gaps 406, 410 therefore allow the handle 282 to move relative to the housing 262 a limited extent along the third axis 310.
  • the biasing member 366 resists shearing forces developed by movement of the handle 282 along the third axis 310, thereby attenuating vibration transmitted to the handle 282 along the third axis 310.
  • the upper bellows 292 is formed from a resilient material and further resists the shearing forces developed by movement of the handle 282 along the third axis 310, thereby providing additional vibration attenuation.
  • the lower bellows 294 attenuates vibration transmitted to the handle 282 along the third axis 310 in conjunction with the lower joint 290.
  • vibration may occur along the first axis 302, the second axis 306, and/or the third axis 310 depending on the use of the rotary hammer 260.
  • the handle 282 (and therefore, the battery pack 270) moves relative to the housing 262 along the first axis 302 between the extended position and the retracted position of the handle 282, the biasing member 366 of each of the joints 288, 290 expands and compresses accordingly to attenuate the vibration occurring along the first axis 302.
  • each of the joints 288, 290 elastically deform between the handle halves 282a, 282b and the guides 390, 394, respectively, to permit limited movement of the handle 282 and the battery pack 270 relative to the housing 262 along the second axis 306, thereby attenuating vibration occurring along the second axis 306.
  • the gaps 406, 410 defined by each of the joints 288, 290 allow for limited movement of the handle 282 and the battery pack 270 relative to the housing 262 along the third axis 310, and the biasing member 366 and the upper and lower bellows 292, 294 resist the resulting shearing forces to attenuate the vibration occurring along the third axis 310.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Portable Power Tools In General (AREA)

Claims (15)

  1. Outil électrique rotatif (260) comprenant :
    un boîtier (262) ;
    un pivot (274) définissant un axe de travail (268) ;
    un moteur (264) supporté par le boîtier (262) et exploitable pour entraîner le pivot (274) ;
    une poignée (282) couplée de manière mobile au boîtier (262), dans lequel la poignée (282) inclut une partie supérieure (284) et une partie inférieure (286) ;
    un ensemble d'isolation contre les vibrations (287) disposé entre le boîtier (262) et la poignée (282) pour atténuer des vibrations transmises du boîtier (262) à la poignée (282), dans lequel l'ensemble d'isolation contre les vibrations (287) inclut une articulation supérieure (288) couplant la partie supérieure (284) de la poignée (282) au boîtier (262) et une articulation inférieure (290) couplant la partie inférieure (286) de la poignée (282) au boîtier (262) ;
    un bloc-batterie (270) couplé de manière amovible directement à la poignée (282) et configuré pour fournir de l'électricité au moteur (264) ; et
    un réceptacle de batterie (414) situé sur la poignée (282) adjacent à la partie inférieure (286), le réceptacle de batterie (414) étant configuré pour recevoir le bloc-batterie (270) lorsque le bloc-batterie (270) est couplé à la poignée (282), caractérisé en ce que
    le réceptacle de batterie (414) définit un axe d'insertion (416) le long duquel le bloc-batterie (270) peut coulisser qui est orienté sensiblement parallèlement à l'axe de travail (268) du pivot (274).
  2. Outil électrique rotatif (260) selon la revendication 1, dans lequel chacune des articulations supérieure et inférieure (288, 290) inclut une tige (334) s'étendant dans la poignée (282) et un élément de sollicitation (366) disposé entre la poignée (282) et le boîtier (262), l'élément de sollicitation (366) étant exploitable pour forcer la poignée (282) vers une position étendue.
  3. Outil électrique rotatif (260) selon la revendication 2, dans lequel chacune des articulations supérieure et inférieure (288, 290) inclut en outre un premier support (350) fixé à l'un parmi le boîtier (262) et la poignée (282) et un second support (370) couplé à l'autre parmi le boîtier (262) et la poignée (282),
    dans lequel au moins l'un parmi le premier support (350) et le second support (370) limite le mouvement de la poignée (282) vers la position étendue.
  4. Outil électrique rotatif (260) selon la revendication 3, dans lequel chacune parmi les articulations supérieure et inférieure (288, 290) inclut en outre un guide (390, 394) disposé au sein de la poignée (282), le guide (390, 394) étant apte à coulisser le long de la tige (334) à mesure que la poignée (282) se déplace entre la position étendue et la position rétractée.
  5. Outil électrique rotatif (260) selon la revendication 4, dans lequel chacune parmi les articulations supérieure et inférieure (288, 290) inclut en outre un butoir (398, 402) disposé entre le guide (390, 394) et la poignée (282), le butoir (398, 402) étant exploitable pour atténuer des vibrations émises le long d'un deuxième axe (306) orthogonal à l'axe de travail (268).
  6. Outil électrique rotatif (260) selon la revendication 1, comprenant en outre un soufflet supérieur (292) entourant au moins une partie de l'articulation supérieure (284) et un soufflet inférieur (294) entourant au moins une partie de l'articulation inférieure (290).
  7. Outil électrique rotatif (260) selon la revendication 1, dans lequel au moins l'une parmi l'articulation supérieure (284) et l'articulation inférieure (290) est exploitable pour atténuer des vibrations transmises le long d'un premier axe (302) parallèle à l'axe de travail (268).
  8. Outil électrique rotatif (260) selon la revendication 7, dans lequel à la fois l'articulation supérieure (284) et l'articulation inférieure (290) sont exploitables pour atténuer des vibrations transmises le long d'un premier axe (302) parallèle à l'axe de travail (268).
  9. Outil électrique rotatif (260) selon la revendication 7, dans lequel au moins l'une parmi l'articulation supérieure (284) et l'articulation inférieure (290) est exploitable pour atténuer des vibrations transmises le long d'un deuxième axe (306) orthogonal au premier axe (302).
  10. Outil électrique rotatif (260) selon la revendication 9, dans lequel à la fois l'articulation supérieure (284) et l'articulation inférieure (290) sont exploitables pour atténuer des vibrations transmises le long du deuxième axe (306).
  11. Outil électrique rotatif (260) selon la revendication 9, dans lequel au moins l'une parmi l'articulation supérieure (284) et l'articulation inférieure (290) est exploitable pour atténuer des vibrations transmises le long d'un troisième axe (310) orthogonal au premier axe (302) et au deuxième axe (306).
  12. Outil électrique rotatif (260) selon la revendication 11, dans lequel à la fois l'articulation supérieure (284) et l'articulation inférieure (290) sont exploitables pour atténuer des vibrations transmises le long du troisième axe (310).
  13. Outil électrique rotatif (260) selon la revendication 1, comprenant en outre une mèche d'outil (266) couplée au pivot (274) ; et un mécanisme d'impact (276) exploitable pour délivrer des impacts axiaux à la mèche d'outil (266).
  14. Outil électrique rotatif (260) selon la revendication 13, dans lequel le mécanisme d'impact (276) inclut :
    un piston alternatif (278) disposé au sein du pivot (274) ;
    un percuteur (279) apte à effectuer des mouvements alternatifs sélectivement au sein du pivot (274) en réponse aux mouvements alternatifs du piston (278) ; et
    une butée (280) qui subit un impact du percuteur (279) lorsque le percuteur (279) effectue un mouvement alternatif vers la mèche d'outil (266), la butée (280) étant configurée pour transférer l'impact à la mèche d'outil (266).
  15. Outil électrique rotatif (260) selon la revendication 1, dans lequel :
    le moteur (265) est un moteur à courant continu sans balais ; et/ou
    l'ensemble d'isolation contre les vibrations (287) isole sensiblement le bloc-batterie (270) par rapport à des vibrations produites pendant une exploitation de l'outil électrique rotatif (260) ; et/ou
    le bloc-batterie (270) est un bloc-batterie lithium-ion rechargeable.
EP14832514.5A 2013-07-15 2014-07-08 Perceuse à percussion Active EP3022019B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201361846303P 2013-07-15 2013-07-15
PCT/US2014/045704 WO2015017083A1 (fr) 2013-07-15 2014-07-08 Perceuse à percussion

Publications (3)

Publication Number Publication Date
EP3022019A1 EP3022019A1 (fr) 2016-05-25
EP3022019A4 EP3022019A4 (fr) 2017-03-08
EP3022019B1 true EP3022019B1 (fr) 2022-04-20

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Application Number Title Priority Date Filing Date
EP14832514.5A Active EP3022019B1 (fr) 2013-07-15 2014-07-08 Perceuse à percussion

Country Status (3)

Country Link
EP (1) EP3022019B1 (fr)
CN (1) CN205651293U (fr)
WO (1) WO2015017083A1 (fr)

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PL3446834T3 (pl) * 2017-08-24 2020-08-10 Scheppach Fabrikation Von Holzbearbeitungsmaschinen Gmbh Młot elektryczny

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EP0066779A1 (fr) 1981-06-10 1982-12-15 HILTI Aktiengesellschaft Marteau pour percer ou buriner
US6568089B1 (en) 1999-06-04 2003-05-27 Porter-Cable/Delta Reciprocating saw having compact configuration and independent stability
JP2003297312A (ja) 2002-04-05 2003-10-17 Hitachi Koki Co Ltd 電池工具の接触不良防止装置
EP1529603A2 (fr) 2003-11-04 2005-05-11 BLACK & DECKER INC. Système limitant les vibrations pour outil électrique, et outil incorporant ce système
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EP2202034A1 (fr) 2007-09-18 2010-06-30 Makita Corporation Machine-outil portative
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EP2314421A1 (fr) 2009-10-20 2011-04-27 Makita Corporation Outils électriques alimentés par batterie
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EP2808130A2 (fr) 2013-05-29 2014-12-03 Makita Corporation Outil électrique à percussion

Also Published As

Publication number Publication date
EP3022019A1 (fr) 2016-05-25
CN205651293U (zh) 2016-10-19
WO2015017083A1 (fr) 2015-02-05
EP3022019A4 (fr) 2017-03-08

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