US3591989A - Hand grinding machines - Google Patents

Hand grinding machines Download PDF

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Publication number
US3591989A
US3591989A US798955A US3591989DA US3591989A US 3591989 A US3591989 A US 3591989A US 798955 A US798955 A US 798955A US 3591989D A US3591989D A US 3591989DA US 3591989 A US3591989 A US 3591989A
Authority
US
United States
Prior art keywords
grinding wheel
chamber
motor
wall
air
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
US798955A
Other languages
English (en)
Inventor
Jorgen Granlie
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.)
SNA Europe Industries AB
Original Assignee
Bahco AB
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 Bahco AB filed Critical Bahco AB
Application granted granted Critical
Publication of US3591989A publication Critical patent/US3591989A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B24B55/04—Protective covers for the grinding wheel
    • B24B55/05—Protective covers for the grinding wheel specially designed for portable grinding machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
    • B24B23/026—Fluid driven

Definitions

  • the present invention is concerned with an improvement in hand grinding machines of the type which consists of a motor driven by air under pressure and a grinding wheel rotated by said motor and partly surrounded about its periphery by a dust shield.
  • the object of the present in vention is to eliminate or at least reducethe efiect of one or more of these causes of discomftt.
  • This object is achieved by means of the present invention, which mainly characterized in that the dust shield consists of an outer and an inner wall which between them form a chamber having one or more outlet openings situated at the periphery of the grinding wheel and adapted to direct the outgoing air away from the motor side of the machine in a free flow substantially parallel to the line of the axis of rotation of the grinding wheel, and in that the chamber is connected by one or more supply passages to the air outlet of the motor, to lead away air leaving the motor, via said chamber.
  • FIG. 1 is a partially cut away side view of a hand grinding machine provided with a sound damping chamber, and in which the departing air is passed from the machine axially, while FIG.
  • the illustrated grinding machine has a motor ll operated by air under pressure and mounted in the body of the machine. The air is lead away from the motor, through an annular passage 2 which is formed by the space between a shaft 3 and a tubular member 4 surrounding said shaft.
  • the shaft connects the motor 1 to a grinding wheel 5 which is detachably affixed to the shaft by hub plates 6, keyed to the end of the shaft in a conventional manner.
  • the grinding wheel 5 is surrounded about half its periphery by a casing 7, the shield, which in a known manner serves as a safety plate, and shields half the grinding wheel axially on the motor side of the machine.
  • the casing 7 consists of an outer wall 8 and an inner wall 9, which between them form a chamber 10.
  • the outgoing air is passed to the chamber from the passage 2, through an opening 11 in the tubular position 4 and a tubular connector 12 detachably connected therewith and surrounding the end of said portion, while at the same time said connector forms an element which partially defines the chamber and which is connected to both walls of thecasing to support the same.
  • the outer wall 8 in the proximity of the connector 12 is in the form of a half, frustoconical casing, located concentrical with the shaft 3, while the inner wall within a corresponding area comprises a flat, half-ring, placed in a plane perpendicular to the shaft 3.
  • the two walls meet at a radial distance from the shaft 3 which is somewhat greater than the outer diameter of the grinding wheel 5, and are bent axially at this point; away from the motor side of the machine, so that their terminating portions which peripherally enclose the grinding wheel form substantially two casing halves.
  • the inner one of these halves i.e.
  • the arrangement thus provides a means, in the form of chamber 10, for dampening the sound created by the exhaust air, a means of leading away the air in a direction in which it does not cause discomfit to the operator, and a means of improving the shielding effect of the casing, by generating a curtain of air which leads the grinding dust away from the machine.
  • An improvement in hand grinding machines of the type which consists of a motor driven by air under pressure and a grinding wheel rotated by said motor and partly surrounded about its periphery by a dust shield, the improvement being characterized in that the dust shield consists of an outer end and an inner wall which between them form a chamber having one or more outlet openings situated at the periphery of the grinding wheel and adapted to direct the outgoing air away from the motor side of he machine in a free flow substantially parallel to the line of the axis of rotation of the grinding wheel; and in that the chamber is connected by one or more supply passages to the air outlet of the motor, to lead away air leaving the motor; via said chamber, said chamber being disposed on the motor side of the grinding wheel and presenting in a section behind the line of the rotary axis of the grinding wheel a substantially triangular profile, with one corner situated at a radial distance from the line of the rotation axis of said wheel which is greater than the outer radius of the wheel and defined along adjacent sides by the outer and the inner wall and
  • the tube nearest the grinding wheel is composed of two separable parts, of which one, in the form of an external sleeve, extends somewhat along the inner tube in an axial direction and is securely connected to the radial inner edges of the walls of the shield thereby to support said shield and form the inner of the defining walls of the chamber, while the inner tube extends up to the motor and is connected with its casing.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
US798955A 1968-02-20 1969-02-13 Hand grinding machines Expired - Lifetime US3591989A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE2217/68A SE321422B ( ) 1968-02-20 1968-02-20

Publications (1)

Publication Number Publication Date
US3591989A true US3591989A (en) 1971-07-13

Family

ID=20259571

Family Applications (1)

Application Number Title Priority Date Filing Date
US798955A Expired - Lifetime US3591989A (en) 1968-02-20 1969-02-13 Hand grinding machines

Country Status (6)

Country Link
US (1) US3591989A ( )
DE (1) DE1904220A1 ( )
FR (1) FR2002217A1 ( )
GB (1) GB1240391A ( )
NL (1) NL6902136A ( )
SE (1) SE321422B ( )

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5041185A ( ) * 1973-10-13 1975-04-15
US3969856A (en) * 1973-09-25 1976-07-20 Andreas Stihl Maschinenfabrik Adjustable protective hood for a rotary tool
US4262452A (en) * 1978-11-24 1981-04-21 Lopez Francisco R Disc brake grinding apparatus and method
US4319433A (en) * 1979-09-24 1982-03-16 Maremont Corporation Tool for cutting automotive components
US4909292A (en) * 1989-03-20 1990-03-20 Wirth Jr John Boring, mortising, tenoning and duplicating woodworking machine
US5597349A (en) * 1994-10-13 1997-01-28 Everlast Products Inc. Rotary stripper and shield
US6186879B1 (en) 1997-03-10 2001-02-13 Atlas Copco Tools Ab Rotary power tool with an extended output shaft
US6588468B1 (en) 1999-06-18 2003-07-08 Lee Valley Tools Ltd. Router table joint making machine
US20040154168A1 (en) * 2003-02-07 2004-08-12 Mcdonald Jon Anthony Dust and debris shield for powered hand tool
US20060068690A1 (en) * 2004-09-29 2006-03-30 Hilti Aktiengesellschaft Cover device for a power tool
US20060174432A1 (en) * 2005-02-03 2006-08-10 Monti-Werkzeuge Gmbh Rotary tool
US20060222541A1 (en) * 2005-03-07 2006-10-05 Ralf Greitmann Attachment for a hand-held power tool
US20080293338A1 (en) * 2005-11-24 2008-11-27 Lars Jonas Hersgren Portable Grinder With a Wheel-Guard Support and Auxiliary Handle
WO2009043615A1 (de) * 2007-09-27 2009-04-09 Robert Bosch Gmbh Schutzvorrichtung
US20110003541A1 (en) * 2009-07-06 2011-01-06 Makita Corporation Sander
WO2011094196A1 (en) 2010-01-26 2011-08-04 Dynabrade, Inc. Abrading device having a front exhaust
EP3421173A1 (en) * 2017-06-27 2019-01-02 X'Pole Precision Tools Inc. Grinding machine

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5065080U ( ) * 1973-10-17 1975-06-12
CN102615569B (zh) * 2012-04-28 2014-03-26 东山电器（珠海）有限公司 一种高速打磨机
CN116100443A (zh) * 2022-12-07 2023-05-12 许春雷 一种具有防护结构的开槽预操作演示刻线专用砂轮机及防护方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2452268A (en) * 1945-06-29 1948-10-26 Schumann Robert Motor hand tool assembly
US2462710A (en) * 1946-05-30 1949-02-22 Ballinger Lewis John Howell Abrasive wheel guard

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2452268A (en) * 1945-06-29 1948-10-26 Schumann Robert Motor hand tool assembly
US2462710A (en) * 1946-05-30 1949-02-22 Ballinger Lewis John Howell Abrasive wheel guard

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3969856A (en) * 1973-09-25 1976-07-20 Andreas Stihl Maschinenfabrik Adjustable protective hood for a rotary tool
JPS5041185A ( ) * 1973-10-13 1975-04-15
JPS5215829B2 ( ) * 1973-10-13 1977-05-04
US4262452A (en) * 1978-11-24 1981-04-21 Lopez Francisco R Disc brake grinding apparatus and method
US4319433A (en) * 1979-09-24 1982-03-16 Maremont Corporation Tool for cutting automotive components
US4909292A (en) * 1989-03-20 1990-03-20 Wirth Jr John Boring, mortising, tenoning and duplicating woodworking machine
US5597349A (en) * 1994-10-13 1997-01-28 Everlast Products Inc. Rotary stripper and shield
US6186879B1 (en) 1997-03-10 2001-02-13 Atlas Copco Tools Ab Rotary power tool with an extended output shaft
US6588468B1 (en) 1999-06-18 2003-07-08 Lee Valley Tools Ltd. Router table joint making machine
US20030196726A1 (en) * 1999-06-18 2003-10-23 Tucker Edwin C. Router table joint making machine
US20040154168A1 (en) * 2003-02-07 2004-08-12 Mcdonald Jon Anthony Dust and debris shield for powered hand tool
US20060068690A1 (en) * 2004-09-29 2006-03-30 Hilti Aktiengesellschaft Cover device for a power tool
US20060174432A1 (en) * 2005-02-03 2006-08-10 Monti-Werkzeuge Gmbh Rotary tool
US8683638B2 (en) 2005-02-03 2014-04-01 Monti-Werkzeuge Gmbh Rotary tool
US20060222541A1 (en) * 2005-03-07 2006-10-05 Ralf Greitmann Attachment for a hand-held power tool
US20080293338A1 (en) * 2005-11-24 2008-11-27 Lars Jonas Hersgren Portable Grinder With a Wheel-Guard Support and Auxiliary Handle
US7850510B2 (en) * 2005-11-24 2010-12-14 Atlas Copco Tools Ab Portable grinder with a wheel-guard support and auxiliary handle
EP1954443A4 (en) * 2005-11-24 2015-07-15 Atlas Copco Ind Tech Ab PORTABLE GRINDER WITH WHEEL GUARD AND AUXILIARY HANDLE
WO2009043615A1 (de) * 2007-09-27 2009-04-09 Robert Bosch Gmbh Schutzvorrichtung
RU2492040C2 (ru) * 2007-09-27 2013-09-10 Роберт Бош Гмбх Защитное устройство
US20110003541A1 (en) * 2009-07-06 2011-01-06 Makita Corporation Sander
WO2011094196A1 (en) 2010-01-26 2011-08-04 Dynabrade, Inc. Abrading device having a front exhaust
CN102712072A (zh) * 2010-01-26 2012-10-03 戴纳布莱德公司 具有前部排气的研磨装置
EP2528713A4 (en) * 2010-01-26 2013-07-31 Dynabrade GRINDING DEVICE WITH FRONT OUTPUT
EP3421173A1 (en) * 2017-06-27 2019-01-02 X'Pole Precision Tools Inc. Grinding machine

Also Published As

Publication number Publication date
NL6902136A ( ) 1969-08-22
FR2002217A1 ( ) 1969-10-17
DE1904220A1 (de) 1969-12-18
GB1240391A (en) 1971-07-21
SE321422B ( ) 1970-03-02

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