EP1304769B1 - Power tools attachable to removable or fixed power cords - Google Patents

Power tools attachable to removable or fixed power cords Download PDF

Info

Publication number
EP1304769B1
EP1304769B1 EP02023212A EP02023212A EP1304769B1 EP 1304769 B1 EP1304769 B1 EP 1304769B1 EP 02023212 A EP02023212 A EP 02023212A EP 02023212 A EP02023212 A EP 02023212A EP 1304769 B1 EP1304769 B1 EP 1304769B1
Authority
EP
European Patent Office
Prior art keywords
fitting portion
sleeve
cord
adapter
power tool
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.)
Expired - Lifetime
Application number
EP02023212A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1304769A2 (en
EP1304769A3 (en
Inventor
Yasuhiko c/o Makita Corporation Kanzaki
Nobumasa c/o Makita Corporation Nomura
Junji c/o Makita Corporation Ishihara
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.)
Makita Corp
Original Assignee
Makita 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
Application filed by Makita Corp filed Critical Makita Corp
Publication of EP1304769A2 publication Critical patent/EP1304769A2/en
Publication of EP1304769A3 publication Critical patent/EP1304769A3/en
Application granted granted Critical
Publication of EP1304769B1 publication Critical patent/EP1304769B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/62—Means for facilitating engagement or disengagement of coupling parts or for holding them in engagement
    • H01R13/627—Snap or like fastening
    • H01R13/6271—Latching means integral with the housing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/58—Means for relieving strain on wire connection, e.g. cord grip, for avoiding loosening of connections between wires and terminals within a coupling device terminating a cable
    • H01R13/582—Means for relieving strain on wire connection, e.g. cord grip, for avoiding loosening of connections between wires and terminals within a coupling device terminating a cable the cable being clamped between assembled parts of the housing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R27/00—Coupling parts adapted for co-operation with two or more dissimilar counterparts

Definitions

  • the present invention relates to power tools and, more particularly, to techniques for either fixedly or removably attaching a power cord to a common housing for a power tool.
  • Power tools are usually connected to an electric power source (commercial power outlet) via a power cord.
  • the power cord may be fixedly attached to the housing of the power tool or may be removably attached to the housing of the power tool.
  • US Patent No. 6,368,133 describes a removable power cord that is inserted into a receiving hole provided within the housing of the power tool.
  • a connection terminal for the power tool is disposed within the receiving hole.
  • the shape of the connection end of the power cord is complementary to the shape of the receiving hole of the housing, and a connection terminal is provided for the power cord.
  • the connection end of the power cord is inserted into the receiving hole of the housing.
  • the connection terminal of the power tool is electrically connected to the connection terminal of the power cord.
  • the power tool includes a motor (e.g., an electric motor) disposed within a housing.
  • the motor being adapted to drive the power tool or a tool bit attached to the power tool.
  • An adapter or connector may be electrically connected to the motor and attached to the housing.
  • the adapter includes a connector fitting portion that is disposed external to (outside of) the housing.
  • the connector fitting portion may be defined, e.g., as a socket or insert for receiving a cord fitting portion of a removable power cord.
  • the cord fitting portion may be defined, e.g., as a plug that is arranged and constructed to fit within (or engage with) the connector fitting portion or socket.
  • one of the connector fitting portion and the cord fitting portion may include a receiving hole.
  • the other of the connector fitting portion and the cord fitting portion may include an insertion projection arranged and constructed for insertion into the receiving hole.
  • At least one projecting terminal may be disposed within the receiving hole and at least one receiving terminal may be arranged and constructed to receive the at least one projecting terminal defined within the insertion projection.
  • the receiving hole may be defined within the connector fitting portion and the insertion projection may be defined within the cord fitting portion.
  • the adapter may include a sleeve that supports the connector fitting portion and the sleeve may be attached to the housing.
  • the sleeve may be arranged and constructed to rotatably support the connector fitting portion, such that the connector fitting portion can rotate within the sleeve.
  • One end of the sleeve may be disposed beyond a corresponding end of the connector fitting portion.
  • First projections may be defined on an inner wall of the end of the sleeve and second projections may be defined on an outer wall of the cord fitting portion (e.g., the plug).
  • the cord fitting portion can be inserted into the connector fitting portion when the connector fitting portion is disposed substantially in a first position with respect to the sleeve. In this first position, the first projections do not interfere with the second projections, thereby allowing the insertion projection of the power cord to be pulled (removed) from or inserted into the receiving hole of the connector fitting portion. Then, when the cord fitting portion is rotated about a common rotational axis to a second position with respect to the sleeve, the first projections preferably engage the second projections in order to prevent the insertion projection of the power cord from being pulled (removed) from the receiving hole of the connector fitting portion. For example, the second projections may block the first projections from passing out of the sleeve.
  • a locking mechanism may be utilized to releasably secure the removable power cord to the sleeve.
  • the locking mechanism may be operated or manipulated to release the removable power cord from the sleeve when the connector fitting portion is disposed in the second position with respect to the sleeve.
  • the locking mechanism may include a groove defined in one of the sleeve or the removable power cord.
  • a locking member may be defined on the other of the sleeve and the removable power cord.
  • the locking member disengages from the groove when the locking member has been operated or manipulated from its original or initial position and the locking member engages the groove when the locking member has been released and returned to its original or initial position.
  • the locking member may be arranged and constructed such that the locking member is urged toward the locking position and away from the unlocking position.
  • the locking member may be made of an elastic resin material that urges the locking member toward the locking position and away from the unlocking position.
  • the locking mechanism may also include one or more stoppers arranged and constructed to prevent the locking member from dislodging from the groove. Further, the locking member may be defined on the removable power cord.
  • the receiving hole may include a recess and an engaging projection may be defined on an outer wall of the cord fitting portion (e.g., the plug).
  • the engaging projection is preferably designed to engage the groove.
  • the sleeve may be attached to the housing such that the sleeve is prevented from rotating with respect to the housing.
  • the adapter fitting portion of the sleeve may be defined so that the adapter fitting portion can not rotate or pivot within the fitting recess of the housing.
  • Fig. 1 shows a representative screwdriver 10 according to the present teachings, in which housing 12 may accommodate motor 11.
  • Tool bit 16 may be mechanically connected to motor 11 via a transmission mechanism (not shown).
  • a removable power cord 61 may be electrically coupled to motor 11 via adapter (e.g., connector) 32 and electric circuit (wire) 13, which may be disposed within housing 12.
  • adapter e.g., connector
  • electric circuit wire
  • Handle 12a may be defined on a portion of housing 12.
  • Trigger switch 14 may be disposed on handle 12a and is preferably designed to actuate motor 11. When trigger switch 14 is actuated, current is supplied to motor 11 from the external power source. When trigger switch 14 is de-activated (released), the supply of current from the external power source will be stopped. Accordingly, pressing or actuating trigger switch 14 will cause tool bit 16 to rotate and releasing or de-activating trigger switch 14 will cause tool bit 16 to stop rotating.
  • Housing 12 may be divided along dividing line 12c into two housing halves 12d, 12e.
  • fitting recess 12b may be defined within a bottom portion of handle 12a, as shown in Figs. 2 and 3 . That is, a first portion of fitting recess 12b may be defined within housing half 12d and a second portion of fitting recess 12b may be defined within housing half 12e.
  • Fitting recess 12b may have, e.g., a substantially square cross-section, although a variety of configurations are contemplated, as will be discussed further below. Further, fitting recess 12b is preferably designed so as to receive either adapter fitting portion 33a for removable power cord 61 or power cord fitting portion 24a of fixedly secured power cord 22, as will be further discussed below.
  • Adapter 32 may be mounted or disposed within fitting recess 12b. As shown in Fig. 2 , adapter 32 may include sleeve 33 and insert (e.g., connector fitting portion) 34. Insert 34 also may be interchangeably referred to as socket 34. Sleeve 33 is preferably separable from insert 34, although sleeve 33 may be integrally and continuously formed with insert 34. In the present embodiment, insert 34 can rotate or pivot within sleeve 33, as will be further discussed below.
  • Adapter fitting portion 33a may be defined in or on a first terminal end of sleeve 33 (e.g., the top end of sleeve 33, as shown in Fig. 3 ).
  • Adapter fitting portion 33a also may have, e.g., a substantially square cross-section, that is substantially complementary to fitting recess 12b.
  • adapter fitting portion 33a is preferably arranged and constructed to fit within (or engage) fitting recess 12b, so that adapter 32 will not rotate within (or with respect to) the handle 12a when adapter 32 is engaged with fitting recess 12b.
  • adapter fitting portion 33a and fitting recess 12b may preferably have substantially square (complementary) configurations, any complementary shapes or configurations that will prevent adapter 32 from rotating with respect to handle 12a may be utilized with the present teachings.
  • An aperture may be defined within sleeve 33 from the first terminal end (e.g., the top end) of sleeve 33 to a second terminal end (e.g., the bottom end) of sleeve 33.
  • the aperture may include a substantially circular upper opening 33d, a substantially circular middle opening 33e, which may have a slightly smaller diameter than upper circular opening 33d, and a substantially circular lower opening 33f, which may have a larger diameter than the substantially circular middle opening 33e.
  • two projections 33b may be defined on an inner wall of substantially circular lower opening 33f of sleeve 33. Projections 33b may be disposed opposite to each other and project inwardly from the inner wall of the substantially circular lower opening 33f.
  • Locking groove 33c may be defined on an outer surface of the lower portion of sleeve 33. Stoppers 33g may be defined on both sides of locking groove 33c and may project from the outer surface of sleeve 33.
  • the outer shape of insert 34 may be substantially cylindrical, such that insert 34 will closely fit within substantially circular upper opening 33d and substantially circular middle opening 33e.
  • Flange 34a may be defined on an upper (or first terminal) end of insert 34.
  • Receiving hole 34b may be defined within the lower (or second terminal) end of insert 34.
  • Receiving hole 34b may preferably extend perpendicularly (e.g., upwardly) from a lower end face of insert 34.
  • the depth of receiving hole 34b may be, e.g., approximately one-half the longitudinal length of insert 34.
  • the cross-sectional design of receiving hole 34b may include a combination of arcs and straight lines.
  • Recess 34c may be defined within one of the two straight inner walls.
  • Two pins (projecting terminals) 35 may be fixed in position so as to extend or project within receiving hole 34b.
  • One wire 36 may be electrically coupled to each respective pin 35.
  • the wires 36 may constitute parts of electric circuit 13 and may be fastened to the first terminal end of insert 34.
  • insert 34 may be inserted from above into apertures 33d, 33e, which are defined within sleeve 33, so as to be pivotable or rotatable with respect to sleeve 33 about the rotational (longitudinal) axis of the insert 34.
  • sleeve 33 may be attached to housing 12 by disposing adapter fitting portion 33a within fitting recess 12b.
  • housing halves 12d, 12e may be assembled around adapter fitting portion 33a so that the adapter fitting portion 33a is securely disposed within fitting recess 12b.
  • adapter fitting portion 33a and fitting recess 12b each have a square cross-section, sleeve 33 cannot pivot or rotate with respect to housing 12.
  • the adapter fitting portion 33a and fitting recess 12b may have different, but still complementary configurations, that enable adapter fitting portion 33a to be non-rotatably disposed within fitting recess 12b.
  • a wide variety of complementary configurations are known in the art and thus need not be specifically described herein.
  • Adapter 32 is preferably designed to receive removable power cord 61.
  • plug (e.g., cord fitting portion) 62 may be coupled to one terminal end of power cord 61.
  • plug 62 may include a substantially cylindrical lower portion.
  • Plug 62 also may include cylindrical portion 62c disposed adjacent to the substantially cylindrical lower portion.
  • Insertion projection 62a may be disposed adjacent to cylindrical portion 62c.
  • Insertion projection 62a preferably may have an outer shape that is complementary with receiving hole 34b of insert 34.
  • Engaging projection 62d may be defined along one of the straight extending peripheral walls of insertion projection 62a.
  • Two terminal holes 66 may be defined within an upper end of insertion projection 62a. Cylindrical terminals 66a may be respectively disposed within terminal holes 66. Cylindrical terminals 66a may be electrically connected to cord 67, which extends from the substantially cylindrical lower portion of plug 62. Two locking projections 62b may project outwardly from cylindrical portion 62c of plug 62. Preferably, locking projections 62b may be symmetrically disposed about the center of cylindrical portion 62c. A power-source plug (not shown) for insertion into a commercial power outlet (or power socket) may be connected to the terminal end of cord 67.
  • plug 62 may also include locking member 64, which may be an elastic resin body.
  • the lower (or first terminal) end of locking member 64 may be coupled to affixing portion 68.
  • Locking portion 64a may be defined on the upper portion of locking member 64.
  • insertion projection 62a of plug 62 may be inserted into receiving hole 34b of insert 34 when the insert 34 is disposed substantially in a first position with respect to the sleeve 33.
  • This insertion operation may be accomplished by moving plug 62 toward adapter 32 in a manner so that projections 33b of sleeve 33 do not interfere with locking projections 62b of plug 62. That is, in the first position, projections 33b do not interfere or engage locking projections 62b.
  • pins 35 Upon inserting plug 62 into adapter 32, pins 35 will be respectively inserted into cylindrical terminals 66a of terminal holes 66.
  • the shape of recess 34c of insert 34 is preferably complementary to the shape of engaging projection 62d so that insertion projection 62a can be inserted into receiving hole 34b. Due to the complementary shapes of engaging projection 62d and receiving hole 34b, plug 62 can be inserted into insert 34 only in one particular orientation, which will be referred to as the "first" or "insertion” orientation.
  • locking member 64 should be pressed, e.g., manually pressed, into the unlocked position.
  • plug 62 is rotated approximately 90 degrees from the first or insertion orientation to a second position while keeping plug 62 completely inserted within adapter 32.
  • locking projections 62b of plug 62 will contact the rear portions of projections 33b of sleeve 33 and plug 62 will be prevented from falling out of (or being removed from) adapter 32 when plug 62 is disposed substantially in the second position with respect to sleeve 33.
  • locking groove 33c of sleeve 33 coincides with locking member 64 in the circumferential direction. Therefore, when the pressing force applied to locking member 64 is removed or released, locking member 64 will return to the locking position due to its elastic restoring force. Therefore, locking portion 64a fits into (engages) locking groove 33c. Because locking portion 64a is fitted into (engaged with) locking groove 33c, plug 62 is prevented from pivoting about its longitudinal axis with respect to insert 34. Further, if stoppers 33g are defined on both sides of locking groove 33c, locking portion 64a can be prevented from dislodging from locking groove 33c.
  • locking member 64 may be deformed (e.g., manually pressed), thereby forcing locking portion 64a out of locking groove 33c.
  • plug 62 By rotating plug 62 around its longitudinal axis to the first or insertion orientation while continually pressing locking member 64 and then by pulling plug 62 in the axial direction, plug 62 can be disconnected (removed) from adapter 32.
  • connection/disconnection of plug 62 to/from adapter 32 can be accomplished by a series of actions, such as inserting and rotating (or pivoting) plug 62 and operating locking member 64. These actions may be manually performed with one hand, thereby enabling "one-touch” operation. Therefore, by using the above-described adapter 32 and plug 62, connection and removal of the removable power cord 61 is facilitated.
  • Fitting recess 12b of the present embodiment also enables a power cord to be fixedly attached to housing 12.
  • a mechanism for receiving and affixing the removable power cord 61 is not provided within housing 12 of screwdriver 10. Therefore, a common fitting portion (e.g., fitting recess 12b) can be utilized in order to affix either the adapter for a removable power cord or a fixed power cord.
  • Fig. 8 shows screwdriver 10, which is identical to screwdriver 10 shown in Fig. 2 , but in which power cord 22 has been fixedly secured to housing 12.
  • power cord 22 may include cord guard 24, which prevents power cord 22 from being sharply bent.
  • Fitting portion 24a may be defined on a terminal end (e.g., an upper end) of cord guard 24 and fitting portion 24a may have a substantially circular cross-section, although naturally the shape of fitting portion 24a is preferably designed to be substantially complementary to the shape of fitting recess 12b.
  • the thickness of fitting portion 24a may be substantially equal to the height of fitting recess 12b.
  • cord clamp 27 may be disposed proximally to fitting recess 12b and cord clamp 27 may be fastened to housing 12, e.g., by screw 26.
  • Power cord 22a may extend within housing 12 and may be firmly and securely disposed between housing 12 and cord clamp 27. Power cord 22 can be disconnected or removed from housing 12 (i.e., from fitting recess 12b) by separating housing half 12e from housing half 12d.
  • the means for affixing the adapter or the power cord to the housing is not particularly limited.
  • the adapter or the power cord may be affixed to the housing by threading the adapter or the power cord into the housing, by tightly pressing (press-fitting) the adapter or the power cord into the housing, or by any other means.
  • adapter 32 comprises sleeve 33 and insert 34 in the representative embodiment, adapter 32 may be a single-piece (integral) device. It is explicitly stated that all features disclosed in the description and/or the claims are intended to be disclosed separately and independently from each other for the purpose of original disclosure as well as for the purpose of restricting the claimed invention independent of the compositions of the features in the embodiments and/or the claims. It is explicitly stated that all value ranges or indications of groups of entities disclose every possible intermediate value or intermediate entity for the purpose of original disclosure as well as for the purpose of restricting the claimed invention.

Landscapes

  • Connector Housings Or Holding Contact Members (AREA)
  • Portable Power Tools In General (AREA)
  • Details Of Connecting Devices For Male And Female Coupling (AREA)
  • Motor Or Generator Frames (AREA)
EP02023212A 2001-10-17 2002-10-16 Power tools attachable to removable or fixed power cords Expired - Lifetime EP1304769B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001319277A JP3830799B2 (ja) 2001-10-17 2001-10-17 電動工具と電動工具のための電源接続装置
JP2001319277 2001-10-17

Publications (3)

Publication Number Publication Date
EP1304769A2 EP1304769A2 (en) 2003-04-23
EP1304769A3 EP1304769A3 (en) 2004-01-07
EP1304769B1 true EP1304769B1 (en) 2008-12-10

Family

ID=19136852

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02023212A Expired - Lifetime EP1304769B1 (en) 2001-10-17 2002-10-16 Power tools attachable to removable or fixed power cords

Country Status (4)

Country Link
US (1) US20030070822A1 (enrdf_load_stackoverflow)
EP (1) EP1304769B1 (enrdf_load_stackoverflow)
JP (1) JP3830799B2 (enrdf_load_stackoverflow)
DE (1) DE60230225D1 (enrdf_load_stackoverflow)

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SE530669C2 (sv) * 2006-03-20 2008-08-05 Atlas Copco Tools Ab Elektriskt kraftverktyg med svivlad kabelanslutning
USD592927S1 (en) * 2006-09-12 2009-05-26 Black & Decker Inc. Drill
USD592477S1 (en) * 2006-09-12 2009-05-19 Black & Decker Inc. Drill
USD595553S1 (en) * 2007-08-23 2009-07-07 Black & Decker Inc. Driver
USD593830S1 (en) * 2007-08-23 2009-06-09 Black & Decker Inc. Driver
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USD593829S1 (en) * 2007-08-23 2009-06-09 Black & Decker Inc. Driver
JP2013520326A (ja) 2010-02-25 2013-06-06 ディメイン テクノロジー プロプライエタリー リミテッド 動力工具収納および包装システム
JP2012049074A (ja) * 2010-08-30 2012-03-08 Makita Corp 電動工具のバッテリパック
DE102011080815A1 (de) * 2011-08-11 2013-02-14 Hilti Aktiengesellschaft Handwerkzeugmaschine
CN103654603B (zh) * 2012-09-26 2017-04-19 科沃斯机器人股份有限公司 擦玻璃机器人
KR101679651B1 (ko) 2014-11-11 2016-11-25 황명구 자원절약형 전기제품 커넥터
JP6652833B2 (ja) * 2015-06-03 2020-02-26 京セラインダストリアルツールズ株式会社 電動工具用コネクタ装置
US11395996B2 (en) * 2018-08-10 2022-07-26 Hamilton Beach Brands, Inc. Immersion mixer with trigger manipulable from multiple grasping locations
DE102023211315A1 (de) * 2023-11-14 2025-05-15 Robert Bosch Gesellschaft mit beschränkter Haftung System bestehend aus einer elektromotorisch angetriebenen Handwerkzeugmaschine und zumindest einem mit der Handwerkzeugmaschine verbindbaren Energieversorgungskabel

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Also Published As

Publication number Publication date
DE60230225D1 (de) 2009-01-22
JP3830799B2 (ja) 2006-10-11
US20030070822A1 (en) 2003-04-17
EP1304769A2 (en) 2003-04-23
EP1304769A3 (en) 2004-01-07
JP2003117855A (ja) 2003-04-23

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