GB2304407A - Hand machine tool with dust extraction device - Google Patents

Hand machine tool with dust extraction device Download PDF

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Publication number
GB2304407A
GB2304407A GB9616898A GB9616898A GB2304407A GB 2304407 A GB2304407 A GB 2304407A GB 9616898 A GB9616898 A GB 9616898A GB 9616898 A GB9616898 A GB 9616898A GB 2304407 A GB2304407 A GB 2304407A
Authority
GB
United Kingdom
Prior art keywords
extraction
fitting piece
machine tool
hand machine
extraction nozzle
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.)
Granted
Application number
GB9616898A
Other versions
GB9616898D0 (en
GB2304407B (en
Inventor
Klaus Wurst
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of GB9616898D0 publication Critical patent/GB9616898D0/en
Publication of GB2304407A publication Critical patent/GB2304407A/en
Application granted granted Critical
Publication of GB2304407B publication Critical patent/GB2304407B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A47L9/10—Filters; Dust separators; Dust removal; Automatic exchange of filters
    • A47L9/14—Bags or the like; Rigid filtering receptacles; Attachment of, or closures for, bags or receptacles
    • A47L9/1427—Means for mounting or attaching bags or filtering receptacles in suction cleaners; Adapters
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A47L9/10—Filters; Dust separators; Dust removal; Automatic exchange of filters
    • A47L9/14—Bags or the like; Rigid filtering receptacles; Attachment of, or closures for, bags or receptacles
    • A47L9/1427—Means for mounting or attaching bags or filtering receptacles in suction cleaners; Adapters
    • A47L9/1436—Connecting plates, e.g. collars, end closures
    • A47L9/1445—Connecting plates, e.g. collars, end closures with closure means
    • A47L9/1454—Self-sealing closures, e.g. valves
    • 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
    • B23Q11/0042—Devices for removing chips
    • B23Q11/0046—Devices for removing chips by sucking
    • 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
    • B24B55/06—Dust extraction equipment on grinding or polishing machines
    • B24B55/10—Dust extraction equipment on grinding or polishing machines specially designed for portable grinding machines, e.g. hand-guided

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Electric Vacuum Cleaner (AREA)

Description

2304407 1 Hand machine tool with dust extraction device
Background art
The invention proceeds from a hand machine tool having a dust bag or filtering bag as well as from an adapter connectable to the hand machine tool for receiving a dust bag or filtering bag according to the type of claims 1 and 5.
From DE-GM 93 16 626 a hand machine tool of the described type having a dust extraction device is known, the dust bag or filtering bag of which is securely and tightly connectable to the air injection nozzle of the hand machine tool, it being impossible however for the air injection nozzle or the fan chamber of the hand machine tool to be sealed off from a possible return flow of dust and swarf. Dust and swarf therefore pass into the air injection nozzle and into the interior of the fan chamber when the hand machine tool is carried around with a full dust bag connected thereto. Upon a subsequent start-up, this may lead to jamming of the fan in the fan chamber and to blocking of the motor. This in turn may lead to burn-out of the motor winding and to serious damage to the hand machine tool or at the workplace. There is also the risk that dust and swarf which have passed into the extraction nozzle when the hand machine is stopped will, after removal of the dust bag, be hurled out into the environment when the tool is subsequently set in operation.
Advantages of the invention In contrast, the hand machine tool according to the invention and the fitting piece for receiving filtering bags or dust bags having the characterizing features of claims 1 and 5 have the advantage that when the extraction fan is switched off, 2 i.e. when the motor is switched off, the extraction nozzle and hence the fan chamber of the hand machine tool are automatically closed so that dust and swarf cannot pass back into the interior of the fan chamber or be moved counter to the dust-conveying direction, i.e. are also not hurled into the environment upon subsequent operation of the tool without a dust bag connected thereto.
When the dust bag is removed jointly with the fitting piece from the product, the fitting piece closes the inlet opening of the dust bag. The dust bag may therefore be taken away for disposal without any risk of dust escaping.
Further advantageous refinements of the invention are indicated in the dependent claims.
Drawings There follows a detailed description of an embodiment of the invention with reference to the accompanying drawings.
Of said drawings, Figure 1 is a longitudinal section of a hand machine tool according to the invention with dust bag, Figure 2 an enlarged cutout of the region according to Figure 1 which carries the dust bag, Figure 3 the view according to Figure 2 with the motor switched off and Figure 4 a three-dimensional view of the fitting piece according to the invention.
Description of the embodiment
The hand machine tool 10 shown in Figure 1 comprises a housing 11 with a handle 12, which carries a switch button 13 for operating an electric switch and has an electric connecting cable 15 emanating from its back end.
At its bottom end, the hand machine tool 10 carries a grinding disc 14 with extraction openings 16, which is drivable by a 3 motor (not described in detail) in a rotatory and gyratory manner. Disposed in the bottom region of the housing 11 in a fan chamber 20 immediately above the grinding disc 14 is a fan 18, which is drive- connected to the motor (not described in detail) and upon start-up of the motor blows the air out of the fan chamber 20 through an extraction nozzle 22, thereby producing at the underside of the grinding disc 14 a vacuum which entrains dust and swarf from the workpiece. Movement arrows 36 illustrate the direction of flow of the extraction air and extraction material.
The extraction nozzle 22 terminates at an outlet opening 24, through which the extraction material leaves the housing 11 and which is overlapped by a fitting piece 26 carrying a dust bag 28. The bag opening 30 of the dust bag 28 overlaps the fitting piece 26 in such a manner that the dust bag is secured against loss. The top region of the dust bag 28 directed towards the handle 12 carries a clip 32, into which is insertable a supporting rail 34 which is displaceably supported on the housing 11 in the region of the handle 12.
Figure 2 is an enlarged view of the region of the extraction nozzle 22. The latter is non-positively encompassed by the fitting piece 26. The fitting piece 26 comprises a front, thick-walled region 38 illustrated in a hatched manner, which has a wall thickness of around 2 to 40mm.
Adjoining the first region 38 of the fitting piece 26 is a second region 40, the outside and inside diameter of which widens towards the free end and which has a wall thickness of around 0.2 mm.
The back region 40 of the fitting piece 26, when extraction air flows through it, is held by said inflation effect in the manner of a tube directed straight along the axis of the extraction nozzle 22.
4 Figure 3 shows the view according to Fig.2 with the motor switched off and the fan 18 consequently at a standstill, with the result that there is no extraction air flowing through the extract on nozzle 22 or through the fitting piece 26. In the absence of an extraction air flow and hence of an inflation effect, the back thin-walled region 40 of the fitting piece 26 collapses in on itself and folds downwards under the effect of gravity, thereby acting as a valve flap which closes the fitting piece 26 and hence the extraction nozzle 22. As a result, neither dust nor swarf may pass from the interior of the dust bag 28 through the fitting piece 26 into the extraction nozzle 22 and the fan chamber 20. The risk of jamming of the fan 18 is therefore eliminated. Particularly during transport of the hand machine tool and in the event of shaking motions and when the motor is switched off, it is ensured that the contents of the dust bag 28 are unable to pass outwards or into the interior of the hand machine tool.
The front region of the fitting piece 26 has a collar 42, which is embraced by the bag opening 30 and which secures the dust bag 28 against loss.
Figure 4 is a three-dimensional view of the fitting piece 26, from which it is evident that the thick-walled front region 38 has an oval shape, which is adapted to the extraction nozzle 22 and verges rearwards in the direction of the back region 40 into a circular cylindrical shape. The back region 40 widens in the shape of a funnel towards its free end, which leads to a deceleration of the flow rate of the dust-laden air flowing through and prevents fine dust escaping from the dust bag 28.
The back region 40 of the fitting piece 26 forms a floppy tube which, in the absence of an inflation effect caused by the extraction air flow, collapses in on itself, folds downwards and acts as a valve flap.
The location and extent of downward folding are determined by the preselected ratio of length and wall thickness of the fitting piece.
The bottom of the dust bag is provided with a zip fastener for waste disposal purposes.
6

Claims (13)

  1. Claims
    Hand machine tool (10) having an extraction nozzle (22), which carries a dust bag (28) or filtering bag, which with its bag opening (30) detachably encompasses the extraction nozzle (22), characterized in that the extraction nozzle (22) at its free end carries a valve (26), which closes the extraction nozzle (22) as soon as the extraction process ends and releases the extraction nozzle (22) as soon as the extraction process begins.
  2. Hand machine tool according to claim 1, characterized in that the valve (26) takes the form of a diaphragm valve or valve flap.
  3. Hand machine tool according to claim 1, characterized in that the valve (26) takes the form of a thin-walled tubular piece which, under its own weight, collapses in on itself and folds over in such a way that, in the absence of an extraction air flow or upon an interrupted air injection process, it closes the extraction nozzle (22) in a dust-proof manner.
  4. 4. Hand machine tool according to claim 3, characterized in that the valve (26), particularly in the form of a tubular piece, is refined into a fitting piece which is mountable onto the extraction nozzle (22) so as to be secured against accidental detachment and carries the dust bag (28) secured against accidental detachment.
  5. Hand machine tool according to claim 4, characterized in that the fitting piece (26) is secured elastically by 7 means of frictional engagement by its inner surface on the extraction nozzle (22) and carries the dust bag (28) secured against loss in that the latter is latched, in particular over an annular bead on its outer surface.
  6. Hand machine tool according to one of claims 1 to 5, characterized in that the valve (26) is opened by the extraction air flow and closes in the absence of an extraction air flow.
  7. 7. Fitting piece (26) for fastening to the extraction nozzle (22) of a hand machine tool according to the preamble of claim 1 and for receiving the dust bag (28), characterized in that the fitting piece at its free end carries a valve (40), which releases the extraction nozzle (22) - opened by the extraction air flow - and closes the extraction nozzle (22) in the absence of an extraction air flow.
  8. Fitting piece according to claim 7, characterized in that its front region (38) directed towards the extraction nozzle (22) has a wall thickness of around 2 to 4 mm and its cross section is adapted to that of the extraction nozzle (22), being in particular oval, and that the back region (40) of the fitting piece (26) forms a floppy tube with a circular cross section, the wall thickness of which is less than 1 mm.
  9. 9. Fitting piece according to claim 8, characterized in that the back region (40) of the fitting piece (26) has a wall thickness of 0.1 to 0.5 mm and its diameter increases and hence widens in the manner of a funnel towards its free end.
  10. 10. Fitting piece according to one of the preceding claims, characterized in that it is made of a rubber-elastic material.
  11. 8 Fitting piece according to one of the preceding claims, characterized in that it has a predetermined folding point which lies between the back region (40) and the front region (38).
  12. 12. A hand machine tool substantially as herein described with reference to the accompanying drawings.
  13. 13. A fitting piece substantially as herein described with reference to the accompanying drawings
GB9616898A 1995-08-19 1996-08-12 Hand machine tool with dust extraction device Expired - Fee Related GB2304407B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19530542A DE19530542A1 (en) 1995-08-19 1995-08-19 Hand machine tool with dust extraction device

Publications (3)

Publication Number Publication Date
GB9616898D0 GB9616898D0 (en) 1996-09-25
GB2304407A true GB2304407A (en) 1997-03-19
GB2304407B GB2304407B (en) 1997-09-17

Family

ID=7769890

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9616898A Expired - Fee Related GB2304407B (en) 1995-08-19 1996-08-12 Hand machine tool with dust extraction device

Country Status (5)

Country Link
CN (1) CN1065466C (en)
CH (1) CH691283A5 (en)
DE (1) DE19530542A1 (en)
GB (1) GB2304407B (en)
IT (1) IT1283790B1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19851064B4 (en) * 1997-11-07 2007-03-29 Makita Corp., Anjo Structure for attaching a dust bag to a motorized tool with a dust collector
CN103521006A (en) * 2013-10-25 2014-01-22 苏州宇洋环保设备制造有限公司 Spraying-blowing device of bag-type dust remover used for isolating corrosive dust
CN105710103A (en) * 2016-01-27 2016-06-29 太仓权阡机械自动化有限公司 Industrial dust remover
US10818450B2 (en) 2017-06-14 2020-10-27 Black & Decker Inc. Paddle switch

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19941620A1 (en) * 1999-09-01 2001-03-08 Bosch Gmbh Robert Hand tool
DE10041906B4 (en) * 2000-08-25 2011-06-09 Hilti Aktiengesellschaft Grinder with dust extraction
DE10047543A1 (en) * 2000-09-22 2002-04-11 Bosch Gmbh Robert Abrasives and abrasives for an electrical grinding tool and electrical grinding tool
ATE364474T1 (en) 2002-12-09 2007-07-15 Black & Decker Inc PLANING MACHINE
GB0228654D0 (en) * 2002-12-09 2003-01-15 Black & Decker Inc Planer
GB0228657D0 (en) 2002-12-09 2003-01-15 Black & Decker Inc Planer
GB0228656D0 (en) 2002-12-09 2003-01-15 Black & Decker Inc Planer
DE60301250T2 (en) 2002-12-09 2006-03-30 Black & Decker Inc., Newark planer
PT1428615E (en) 2002-12-09 2007-09-20 Black & Decker Inc Planer
US8087977B2 (en) 2005-05-13 2012-01-03 Black & Decker Inc. Angle grinder
JP4747850B2 (en) * 2006-01-20 2011-08-17 日立工機株式会社 Dust collector
DE102006029624A1 (en) * 2006-06-28 2008-01-03 Robert Bosch Gmbh Dust collecting device for a handheld electric machine tool
DE102007036783A1 (en) * 2007-08-03 2009-02-05 Robert Bosch Gmbh Hand tool with a dust extraction device
CN102615569B (en) * 2012-04-28 2014-03-26 东山电器（珠海）有限公司 High-speed grinding machine
CN103962621A (en) * 2014-05-09 2014-08-06 陈婷 Planer tool limiter of electric planer
CN104227140A (en) * 2014-08-29 2014-12-24 常州武进长城工具有限公司 Dust suction file
CN112720160A (en) * 2020-12-28 2021-04-30 南京顺遂姐商贸有限公司 Polishing equipment for plastic production
CN114274049B (en) * 2022-01-10 2023-03-21 常州赛迪工具有限公司 Electric tool dust collection structure and handheld electric sander with same

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB545233A (en) * 1940-03-20 1942-05-15 Hans Herzog Electric suction cleaner
GB1211930A (en) * 1967-12-27 1970-11-11 Gottlieb Herre Cleaning apparatus, especially for textile machines
US4675032A (en) * 1986-09-29 1987-06-23 Southwest Manufacturers & Distributors, Inc. Vacuum cleaner bag with oscillating tube

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO137612C (en) * 1972-07-19 1978-03-21 Atlas Copco Ab AUTOMATIC STOVE SEPARATOR.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB545233A (en) * 1940-03-20 1942-05-15 Hans Herzog Electric suction cleaner
GB1211930A (en) * 1967-12-27 1970-11-11 Gottlieb Herre Cleaning apparatus, especially for textile machines
US4675032A (en) * 1986-09-29 1987-06-23 Southwest Manufacturers & Distributors, Inc. Vacuum cleaner bag with oscillating tube

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19851064B4 (en) * 1997-11-07 2007-03-29 Makita Corp., Anjo Structure for attaching a dust bag to a motorized tool with a dust collector
CN103521006A (en) * 2013-10-25 2014-01-22 苏州宇洋环保设备制造有限公司 Spraying-blowing device of bag-type dust remover used for isolating corrosive dust
CN105710103A (en) * 2016-01-27 2016-06-29 太仓权阡机械自动化有限公司 Industrial dust remover
US10818450B2 (en) 2017-06-14 2020-10-27 Black & Decker Inc. Paddle switch

Also Published As

Publication number Publication date
GB9616898D0 (en) 1996-09-25
ITMI961740A1 (en) 1998-02-09
CN1065466C (en) 2001-05-09
CH691283A5 (en) 2001-06-29
IT1283790B1 (en) 1998-04-30
CN1151343A (en) 1997-06-11
DE19530542A1 (en) 1997-02-20
GB2304407B (en) 1997-09-17
ITMI961740A0 (en) 1996-08-09

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20100812