US20060222541A1 - Attachment for a hand-held power tool - Google Patents

Attachment for a hand-held power tool Download PDF

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Publication number
US20060222541A1
US20060222541A1 US11/369,324 US36932406A US2006222541A1 US 20060222541 A1 US20060222541 A1 US 20060222541A1 US 36932406 A US36932406 A US 36932406A US 2006222541 A1 US2006222541 A1 US 2006222541A1
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US
United States
Prior art keywords
attachment
power tool
outer housing
coupling section
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.)
Abandoned
Application number
US11/369,324
Inventor
Ralf Greitmann
Olaf Schadoffsky
Cyrus Barimani
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.)
Hilti AG
Original Assignee
Hilti AG
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 Hilti AG filed Critical Hilti AG
Assigned to HILTI AKTIENGESELLSCHAFT reassignment HILTI AKTIENGESELLSCHAFT ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BARIMANI, CYRUS, GREITMANN, RALF, SCHADOFFSKY, OLAF
Publication of US20060222541A1 publication Critical patent/US20060222541A1/en
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q5/00—Driving or feeding mechanisms; Control arrangements therefor
    • B23Q5/02—Driving main working members
    • B23Q5/04—Driving main working members rotary shafts, e.g. working-spindles
    • B23Q5/043—Accessories for spindle drives
    • B23Q5/045—Angle drives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B45/00—Hand-held or like portable drilling machines, e.g. drill guns; Equipment therefor
    • B23B45/003—Attachments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/12—Arrangements for cooling or lubricating parts of the machine
    • B23Q11/126—Arrangements for cooling or lubricating parts of the machine for cooling only
    • B23Q11/127—Arrangements for cooling or lubricating parts of the machine for cooling only for cooling motors or spindles
    • 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
    • B25D17/20—Devices for cleaning or cooling tool or work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F3/00—Associations of tools for different working operations with one portable power-drive means; Adapters therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/008—Cooling means

Definitions

  • the present invention relates to an attachment for a hand-held power tool and which includes an outer housing, a tool holder for receiving a working tool, and a coupling section for connection with a drive spindle of the hand-held power tool that can be formed at least as a rotary power tool.
  • the attachment such as, e.g., a tool holder, includes a coupling section with which it can be mounted on the drive spindle of at least rotary power tool.
  • the tool holder includes, e.g., a chuck, such as a standard three-or-two-jaw chuck which is formed for receiving a corresponding shank of a drill, percussion drill, borer, or chisel. In this way, different working tools, which may have different types of shanks, can be secured on one and the same hand-held power tool.
  • the attachment can further be formed as an angle drilling attachment, as a screw-driving attachment, as a thread-cutting attachment, ets., and is mounted on the drive spindle of a power tool, e.g., at least rotary power tool.
  • a power tool e.g., at least rotary power tool.
  • German Publication DE 35 15 661 A1 discloses different attachments having a coupling section with which they are mounted on a drive spindle of a rotary percussion power tool.
  • the drawback of the attachment according to DE 35 15 661 A1 consists in that during operation, high temperatures can be produced in the outer housing of the attachment. As a result, these attachments can be used, without cooling, only for a limited time. In the worst case, a thermal breakdown can occur during an operation. This is particularly the case in angle drilling attachments in which losses, which results from deflection, are additionally converted into heat.
  • German Publication DE 196 26 254 A1 discloses feeding cooling air from a hand-held power tool to an attachment, which is formed as a tool holder, through axial passage slots.
  • the drawback of this solution consists in that the cooling air becomes very heated as a result of cooling the motor, the gear drive, and the percussion mechanism, and the tool holder cannot be adequately cooled by the heated outgoing air.
  • the tool holder forms an additional resistance for the air flow of the power tool which leads to an additional load being applied to ventilation elements of the power tool which, in turn, can lead to their damage during a lasting operation.
  • Swiss patent CH 692 488 A5 discloses a hand-held power tool with an attachment and in which the outlet openings in the power tool housing are closed with guide elements, so that the outgoing, from the power tool, air is conducted through a cooling channel to the to-be-cooled working tool region of the attachment.
  • the drawback of this solution consists in that a pre-heated cooling air is used and in that the guide elements additionally load the power tool.
  • An object of the present invention is to insure an adequate cooling of a rotatable attachment even during a lasting operation, without noticeably additionally loading the ventilation elements of the power tool.
  • a ventilation device in the outer housing of the attachment is driven, directly or indirectly, by the drive spindle of the power tool, so that a cooling air flow is produced within the attachment.
  • the ventilation device inside the attachment housing reduces the temperature in the attachment and increases the operating time of the attachment during a lasting operation.
  • the ventilation elements of the power tool are responsible for cooling of only the power tool and are not additionally responsible for cooling the attachment and, therefore, should be designed accordingly.
  • At least one outlet opening for releasing of the cooling air from the attachment is provided in the outer housing, e.g., in the region of the attachment remote from the power tool.
  • the cooling flow which is produced by the ventilation device, flows through the attachment, removing the heat produced in the attachment.
  • At least one inlet opening for admitting surrounding air, which is aspirated by the ventilation device, is provided in the outer housing of the attachment.
  • a separate cooling air flow for the attachment independent of the cooling air flow in the power tool, insures an extended operational time of the attachment also during its lasting operation.
  • the ventilation device for producing a cooling air flow in the attachment includes at least one rotatable blower wheel.
  • the at least one blower wheel is mounted on the coupling section of the attachment for joint rotation therewith.
  • the cooling air flow is, thereby, produced by the at least one blower wheel in the region of the attachment adjacent to the power tool, and can flow through the entire outer housing of the attachment for cooling the same.
  • the blower wheel is, e.g., pressed onto the coupling section or is glued thereto.
  • the blower wheel is formed of a plastic material, it can be, e.g., shrinked over the coupling section.
  • the attachment includes a further drive shaft with, advantageously, a further blower wheel mounted thereon.
  • the additional or further drive shaft can serve, e.g., for driving a chuck of an angle drilling attachment.
  • the at least one blower wheel can, e.g., be pressed on further drive shaft or be shrunk thereon in case the blower wheel is made of a plastic material.
  • more than one blower wheel is used then, e.g., one blower wheel is mounted on the coupling section, and the further blower wheel is mounted on the further drive shaft in a region of the shaft further remote from the power tool.
  • FIG. 1 a longitudinal cross-sectional view of an angle drilling attachment according to the present invention which is mounted on an hand-held power tool;
  • FIG. 2 a longitudinal cross-sectional view of a tool holder which forms an attachment according to the present invention and is mounted on a hand-held power tool.
  • An attachment 11 according to the present invention which is shown in FIG. 1 and is formed as an angle drilling attachment for at least rotary hand-held power tool 1 such as, e.g., electro-pneumatic hammer drill, includes an outer housing 12 , a tool holder 13 for a working tool such as a drill or a hammer or percussion drill.
  • the attachment 11 further includes a coupling section 14 connectable with a drive spindle 2 of the power tool 1 .
  • a two-part drive shaft 15 , 16 which is arranged in the outer housing 12 .
  • a ventilation device for the attachment includes two rotatable blower wheel 17 , 18 .
  • the first blower wheel 17 is mounted on the coupling section 14 for joint rotation therewith.
  • the second blower wheel 18 is mounted on the drive shaft 15 likewise for joint rotation therewith.
  • In the outer housing 12 there is provided an inlet opening 21 for admitting the surrounding air and a plurality of outlet openings 22 for releasing a cooling stream 23 produced by the blower wheels 17 , 18 .
  • only one blower wheel can be provided which can be mounted either on the coupling section 14 or the drive shaft 15 .
  • An attachment 31 which is shown in FIG. 2 , is formed as a tool holder for receiving a drill, a percussion drill, or a chisel.
  • the attachment 31 has a ventilation device that is formed by a blower wheel 37 mounted on the coupling section 34 .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

An attachment for at least rotary hand-held power tool includes a tool holder (13) for receiving a working tool and extending into the power tool outer housing (12), a coupling section (14, 34) for connection with a drive shaft (2) of the at least rotary hand-held power tool (1), and a ventilation device arranged in the outer housing (12).

Description

    BACKGROUND OF THE INVENTION
  • 1. Field of the Invention
  • The present invention relates to an attachment for a hand-held power tool and which includes an outer housing, a tool holder for receiving a working tool, and a coupling section for connection with a drive spindle of the hand-held power tool that can be formed at least as a rotary power tool.
  • 2. Description of the Prior Art
  • With attachments of the type described above, the application range of hand-held power tools such as at least rotary power tools can be noticeably widened. The attachment, such as, e.g., a tool holder, includes a coupling section with which it can be mounted on the drive spindle of at least rotary power tool. The tool holder includes, e.g., a chuck, such as a standard three-or-two-jaw chuck which is formed for receiving a corresponding shank of a drill, percussion drill, borer, or chisel. In this way, different working tools, which may have different types of shanks, can be secured on one and the same hand-held power tool. The attachment can further be formed as an angle drilling attachment, as a screw-driving attachment, as a thread-cutting attachment, ets., and is mounted on the drive spindle of a power tool, e.g., at least rotary power tool.
  • German Publication DE 35 15 661 A1 discloses different attachments having a coupling section with which they are mounted on a drive spindle of a rotary percussion power tool. The drawback of the attachment according to DE 35 15 661 A1 consists in that during operation, high temperatures can be produced in the outer housing of the attachment. As a result, these attachments can be used, without cooling, only for a limited time. In the worst case, a thermal breakdown can occur during an operation. This is particularly the case in angle drilling attachments in which losses, which results from deflection, are additionally converted into heat.
  • German Publication DE 196 26 254 A1 discloses feeding cooling air from a hand-held power tool to an attachment, which is formed as a tool holder, through axial passage slots. The drawback of this solution consists in that the cooling air becomes very heated as a result of cooling the motor, the gear drive, and the percussion mechanism, and the tool holder cannot be adequately cooled by the heated outgoing air. In addition, the tool holder forms an additional resistance for the air flow of the power tool which leads to an additional load being applied to ventilation elements of the power tool which, in turn, can lead to their damage during a lasting operation.
  • Swiss patent CH 692 488 A5 discloses a hand-held power tool with an attachment and in which the outlet openings in the power tool housing are closed with guide elements, so that the outgoing, from the power tool, air is conducted through a cooling channel to the to-be-cooled working tool region of the attachment. The drawback of this solution consists in that a pre-heated cooling air is used and in that the guide elements additionally load the power tool.
    • SUMMARY OF THE INVENTION
  • An object of the present invention is to insure an adequate cooling of a rotatable attachment even during a lasting operation, without noticeably additionally loading the ventilation elements of the power tool.
  • These and other objects of the present invention, which will become apparent hereinafter, are achieved by providing a ventilation device in the outer housing of the attachment. The ventilation device is driven, directly or indirectly, by the drive spindle of the power tool, so that a cooling air flow is produced within the attachment. The ventilation device inside the attachment housing reduces the temperature in the attachment and increases the operating time of the attachment during a lasting operation. The ventilation elements of the power tool are responsible for cooling of only the power tool and are not additionally responsible for cooling the attachment and, therefore, should be designed accordingly.
  • Advantageously, at least one outlet opening for releasing of the cooling air from the attachment is provided in the outer housing, e.g., in the region of the attachment remote from the power tool. Thereby, the cooling flow, which is produced by the ventilation device, flows through the attachment, removing the heat produced in the attachment.
  • Advantageously, at least one inlet opening for admitting surrounding air, which is aspirated by the ventilation device, is provided in the outer housing of the attachment. Thus, there is produced an air flow for cooling of the attachment and which is not pre-heated in the power tool. A separate cooling air flow for the attachment, independent of the cooling air flow in the power tool, insures an extended operational time of the attachment also during its lasting operation.
  • Preferably, the ventilation device for producing a cooling air flow in the attachment includes at least one rotatable blower wheel. Dependent on the need in cooling of the attachment, for producing of the necessary cooling flow more than one blower wheel can be provided in the attachment.
  • Advantageously, the at least one blower wheel is mounted on the coupling section of the attachment for joint rotation therewith. The cooling air flow is, thereby, produced by the at least one blower wheel in the region of the attachment adjacent to the power tool, and can flow through the entire outer housing of the attachment for cooling the same. For fixedly mounting the blower wheel on the coupling attachment for joint rotation therewith, the blower wheel is, e.g., pressed onto the coupling section or is glued thereto. When the blower wheel is formed of a plastic material, it can be, e.g., shrinked over the coupling section.
  • Advantageously, the attachment includes a further drive shaft with, advantageously, a further blower wheel mounted thereon. The additional or further drive shaft can serve, e.g., for driving a chuck of an angle drilling attachment. The at least one blower wheel can, e.g., be pressed on further drive shaft or be shrunk thereon in case the blower wheel is made of a plastic material. When more than one blower wheel is used then, e.g., one blower wheel is mounted on the coupling section, and the further blower wheel is mounted on the further drive shaft in a region of the shaft further remote from the power tool.
  • The novel features of the present invention, which are considered as characteristic for the invention, are set forth in the appended claims. The invention itself, however, both as to its construction and its mode of operation, together with additional advantages and objects thereof, will be best understood from the following detailed description of preferred embodiments, when read with reference to the accompanying drawings.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • The drawings show:
  • FIG. 1 a longitudinal cross-sectional view of an angle drilling attachment according to the present invention which is mounted on an hand-held power tool; and
  • FIG. 2 a longitudinal cross-sectional view of a tool holder which forms an attachment according to the present invention and is mounted on a hand-held power tool.
  • In both embodiments, the same elements are designated with the same reference numerals.
    • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
  • An attachment 11 according to the present invention, which is shown in FIG. 1 and is formed as an angle drilling attachment for at least rotary hand-held power tool 1 such as, e.g., electro-pneumatic hammer drill, includes an outer housing 12, a tool holder 13 for a working tool such as a drill or a hammer or percussion drill. The attachment 11 further includes a coupling section 14 connectable with a drive spindle 2 of the power tool 1. For driving a working tool receivable in the tool holder 13, there is provided, on the coupling section 14, a two- part drive shaft 15, 16 which is arranged in the outer housing 12.
  • A ventilation device for the attachment includes two rotatable blower wheel 17, 18. The first blower wheel 17 is mounted on the coupling section 14 for joint rotation therewith. The second blower wheel 18 is mounted on the drive shaft 15 likewise for joint rotation therewith. In the outer housing 12, there is provided an inlet opening 21 for admitting the surrounding air and a plurality of outlet openings 22 for releasing a cooling stream 23 produced by the blower wheels 17, 18. Instead of two blower wheels 17, 18, only one blower wheel can be provided which can be mounted either on the coupling section 14 or the drive shaft 15.
  • An attachment 31, which is shown in FIG. 2, is formed as a tool holder for receiving a drill, a percussion drill, or a chisel. For cooling, the attachment 31 has a ventilation device that is formed by a blower wheel 37 mounted on the coupling section 34.
  • Though the present invention was shown and described with references to the preferred embodiments, such are merely illustrative of the present invention and are not to be construed as a limitation thereof and various modifications of the present invention will be apparent to those skilled in the art. It is, therefore, not intended that the present invention be limited to the disclosed embodiments or details thereof, and the present invention includes all variations and/or alternative embodiment within the spirit and scope of the present invention as defined by the appended claims.

Claims (7)

1. An attachment for at least a rotary hand-held power tool, comprising a outer housing (12); a tool holder (13) for receiving a working tool and extending into the outer housing (12); a coupling section (14, 34) for connection with a drive shaft (2) of the at least rotary hand-held power tool (1); and a ventilation device arranged in the outer housing (12).
2. An attachment according to claim 1, wherein at least one outlet opening (22) is provided in the outer housing (12).
3. An attachment according to claim 1, wherein at least one inlet opening (21) is provided in the outer housing (12).
4. An attachment according to claim 1, wherein the ventilation device comprises at least one rotatable blower wheel (17, 18; 37).
5. An attachment according to claim 4, wherein the blower wheel (17, 37) is mounted on the coupling section (14, 34) for joint rotation therewith.
6. An attachment according to claim 1, further comprising, in addition to the coupling section (14), a further drive shaft (15).
7. An attachment according to claim 6, wherein the ventilation device comprises two blower wheels (17, 18) mounted, respectively, on the coupling section (14) and the further drive shaft (15).
US11/369,324 2005-03-07 2006-03-06 Attachment for a hand-held power tool Abandoned US20060222541A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005000018A DE102005000018A1 (en) 2005-03-07 2005-03-07 header
DE102005000018.5 2005-03-07

Publications (1)

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US20060222541A1 true US20060222541A1 (en) 2006-10-05

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US (1) US20060222541A1 (en)
EP (1) EP1700672B1 (en)
CN (1) CN1830630A (en)
DE (2) DE102005000018A1 (en)

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US20070261871A1 (en) * 2006-05-05 2007-11-15 Oliver Ohlendorf Hand-held power tool with a chuck for receiving a percussion working tool
US20130154205A1 (en) * 2011-12-15 2013-06-20 Black & Decker Inc. Right Angle Attachment For Power Tools
US20130299207A1 (en) * 2012-05-10 2013-11-14 Black & Decker, Inc. Power tool cooling
EP2149432A3 (en) * 2008-07-30 2014-07-02 Hitachi Koki CO., LTD. Power tool

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SE529743C2 (en) * 2006-12-01 2007-11-13 Atlas Copco Tools Ab Pneumatic tool, has angular gear cooling system which passes exhaust air through front air outlet casing containing a circular groove formed in tool casing
DE102008017643B4 (en) * 2008-04-04 2016-09-15 Sew-Eurodrive Gmbh & Co Kg Adapter, gearbox and drive
GB2549308A (en) * 2016-04-13 2017-10-18 Rolls Royce Plc Apparatus for machining components of gas turbine engines
CN116652689A (en) * 2023-08-02 2023-08-29 通用技术集团机床工程研究院有限公司 Automatic machine tool dragging cooling system and cooling method

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US2212342A (en) * 1938-03-30 1940-08-20 Independent Pneumatic Tool Co Electric drill
US2342610A (en) * 1940-11-01 1944-02-22 Elliott Mfg Co Handpiece
US2377271A (en) * 1942-12-12 1945-05-29 Anne R Schumann Flexible shaft and air-cooled hand piece
US2452268A (en) * 1945-06-29 1948-10-26 Schumann Robert Motor hand tool assembly
US2437668A (en) * 1946-04-29 1948-03-16 Richard P Bernhardt Power-driven rotary cylindrical saw
US2517882A (en) * 1947-08-11 1950-08-08 Johnson Moses Illuminated hand held motor tool
US2546846A (en) * 1947-11-01 1951-03-27 Clarke Sanding Machine Company Motor-driven tool
US2532823A (en) * 1949-08-25 1950-12-05 Helmut W Schumann Motor tool
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US2553924A (en) * 1949-11-21 1951-05-22 Edward H Lillquist Power saw and sander
US3109238A (en) * 1961-11-28 1963-11-05 Samuel B Marks Portable dental drill
US3591989A (en) * 1968-02-20 1971-07-13 Bahco Ab Hand grinding machines
US3585427A (en) * 1968-05-18 1971-06-15 Bosch Gmbh Robert Electronic speed arrangement for electrically operated power tools
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US20070261871A1 (en) * 2006-05-05 2007-11-15 Oliver Ohlendorf Hand-held power tool with a chuck for receiving a percussion working tool
US8176997B2 (en) * 2006-05-05 2012-05-15 Hilti Aktiengesellschaft Hand-held power tool with a chuck for receiving a percussion working tool
EP2149432A3 (en) * 2008-07-30 2014-07-02 Hitachi Koki CO., LTD. Power tool
US20130154205A1 (en) * 2011-12-15 2013-06-20 Black & Decker Inc. Right Angle Attachment For Power Tools
US9314852B2 (en) * 2011-12-15 2016-04-19 Black & Decker Inc. Right angle attachment for power tools
EP2604392A3 (en) * 2011-12-15 2018-01-17 Black & Decker Inc. Right angle attachment for power tools
US20130299207A1 (en) * 2012-05-10 2013-11-14 Black & Decker, Inc. Power tool cooling

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DE502006005219D1 (en) 2009-12-10
DE102005000018A1 (en) 2006-09-14
EP1700672A1 (en) 2006-09-13
EP1700672B1 (en) 2009-10-28
CN1830630A (en) 2006-09-13

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