GB2481530A - Valve with integral bearing and spring in an air flow control device for a machine tool - Google Patents
Valve with integral bearing and spring in an air flow control device for a machine tool Download PDFInfo
- Publication number
- GB2481530A GB2481530A GB1110609.3A GB201110609A GB2481530A GB 2481530 A GB2481530 A GB 2481530A GB 201110609 A GB201110609 A GB 201110609A GB 2481530 A GB2481530 A GB 2481530A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve part
- machine tool
- control device
- air flow
- spring element
- 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.)
- Withdrawn
Links
- 229920003023 plastic Polymers 0.000 claims abstract description 5
- 239000004033 plastic Substances 0.000 claims abstract description 5
- 230000001105 regulatory effect Effects 0.000 claims abstract description 3
- 239000000463 material Substances 0.000 claims description 10
- 238000010276 construction Methods 0.000 description 14
- 238000000605 extraction Methods 0.000 description 10
- 239000000428 dust Substances 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 4
- 238000003754 machining Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
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
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Auxiliary Devices For Machine Tools (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Grinding-Machine Dressing And Accessory Apparatuses (AREA)
Abstract
An air flow control device for a machine tool comprises a valve part 7 supported displaceably in an air duct 2 for regulating the air flow 5 conveyed through the air duct 2, wherein the valve 7 is formed integrally with a bearing portion 8 for supporting the valve part 7 and a spring element 9 for loading the valve part 7. The valve 7, bearing 8 and spring element 9 may be formed from plastic. The spring may be curved in an S shape. The valve 7 may be passive and moved by different pressure or airflow conditions. The valve 7 may open and close a second air duct 4. The device may be mounted with the housing 1 of a hand held sanding device.
Description
Description Title
Air flow control device for a machine tool The invention refers to an air flow control device for a machine tool, in particular for a hand-held machine tool such as for example a hand-held sanding device.
Background art
Electrically driven hand-held machine tools for machining workpieces are known, the drive motor of which is connected by a gear unit to a drive shaft that receives the tool.
For cooling the electric drive motor, a cooling air flow is generated with the aid of an fan impeller, which may be integrated into the drive motor, and flows through the motor housing before then being discharged from the machine housing through a flow channel.
Hand-held cutting and/or sanding machine tools are moreover known, in which the abraded material arising from machining of the workpiece is extracted by a suction device from the work area of the machine tool and conveyed into a dust collecting container. In this case too, an air flow has to be generated with the aid of a fan impeller, which is driven by the electric drive motor.
Disclosure of the invention
The underlying object of the invention is to regulate air flows in machine tools in a constructionally simpler and more efficient manner.
This object is achieved according to the invention by the features of claim 1. The sub-claims indicate advantageous developments.
The air flow control device according to the invention may be used in machine tools either to cool the drive device -usually an electric motor -or to remove abraded material such as chips or abrasive dust that arises during machining of the workpiece, for which purposes the air flow is either directed towards the work area of the machine tool in order to blow it clear or, in the form of a suction air flow, extracts abraded material from the work area and conveys it to a dust collecting container. Optionally, the function of cooling the drive device is combined with that of blowing the work area clear and/or cleaning the work area by suction removal.
The air flow control device according to the invention is a mechanical constructional unit that comprises a valve part for regulating the air flow, a bearing portion for displaceably supporting the valve part, and a spring element for loading the valve part. All of the elements of the constructional unit, i.e. the valve part, the bearing portion and the spring element, are of an integral construction, thereby achieving a compact constructional unit that is of a simple design and moreover offers advantages in terms of assembly. In contrast thereto, control devices of prior art for air flows in machine tools are conventionally of a multipart construction, wherein at least the valve part and the bearing portion, on the one hand, and the spring element, on the other hand, form separate components. By combining the control device according to the invention into a common constructional unit a reduction of the number of parts is achieved.
The control device is advantageously a purely passive constructional unit that is to be displaced exclusively by means of external forces acting upon the constructional unit. These external forces are in particular air flows and/or air pressures, which act upon the constructional unit, in particular the valve part, and lead to a displacement of the valve part. The valve part is to be displaced between at least two different positions about the bearing unit in order to regulate the air flow in an air duct, in which the valve part is disposed. Optionally, the valve part is to be displaced into a plurality of intermediate positions and/or continuously between two end positions.
According to an alternative construction the valve part is displaced between its different positions by means of an actuator, wherein the actuator acts upon the bearing portion or directly upon the valve part.
By means of the spring element, which is formed integrally with the valve part and the bearing portion, a loading of the valve part into a specific position is achieved. In order to move the valve part from this position into a further position, a force has to act upon the valve part or some other component of the constructional unit, this being effected, as described above, by means of air flows and/or air pressures and/or an actuator that acts upon the constructional unit.
By means of the bearing portion the valve part is advantageously supported in a rotatable manner on a housing of the machine tool. The bearing portion itself is accommodated in a rotatable manner, wherein in the event of a rotation about the bearing axis the valve part, because of the integral construction of valve part and bearing portion, also executes a rotation.
According to a further construction it is provided that the valve part and the bearing portion execute a translatory displacement movement. A combination of a translatory and a rotary movement is further possible. In the case of displacement movements, the bearing portion may optionally coincide with the valve part. In the case of rotary movements, the bearing portion may be situated within the valve part.
According to a further advantageous construction the valve part, the bearing portion and the spring element are manufactured from plastics material. Such plastic components are economical to manufacture, for example by injection moulding.
According to a further advantageous construction the bearing portion is disposed between the valve part and the spring element. The valve part and the spring element are therefore situated at opposite sides of the constructional unit, wherein the action of the spring element loads the bearing portion including the valve part fitted thereon into a defined position.
The spring element may be of a curved configuration in order to be able to provide the required spring action.
For simplified manufacture, it may be advantageous if the spring element and the valve part lie in a common plane, wherein in principle three-dimensional constructions both of the valve part and of the spring element are also conceivable. In the curved configuration the spring element is for example of an S-shaped design.
The invention further relates to a machine tool, in particular a hand-held machine tool, which is equipped with an air flow control device of the previously described type. In an advantageous construction the valve part of the control device forms a wall portion of the air duct in the interior of the machine tool, through which the air flow is directed. The air duct is preferably a duct, which is disposed downstream of the drive device and through which the air flow, which is preferably conveyed first via the drive motor, is removed. The air duct leads for example to the work area of the machine, towards which the air flow is directed in order to blow the work area clear of chips or other pollutants. The air duct may however also lead to a dust collecting container, in which the abraded material from the work area is conveyed through the duct.
According to a further advantageous construction the valve part is disposed between two duct portions, wherein a first duct portion leads to the work area and a second duct portion leads to an extraction device. In the non-actuated state of the extraction device, the valve part is loaded by the action of the spring element acting upon it into a closing position, in which the second duct portion leading to the extraction device is closed, with the result that only the first duct portion leading to the work area is open. In this position the air flow is used to blow the With actuation of the extraction device a partial vacuum is generated in the second duct portion and displaces the valve part counter to the action of the spring element, whereupon the fed air flow is conveyed in the second duct portion and abraded material is extracted from the work area through the first duct portion.
It may be advantageous during assembly to fasten only the free end of the spring element in a housing-fixed manner.
This construction is in principle sufficient to enable the production of a spring action that loads the valve part into the desired position. The constructional unit is therefore fastened in the housing of the machine tool merely by the bearing portion and the free end of the spring element.
Further advantages and advantageous constructions may be gathered from the further claims, the description of the figures and the drawings. These show: Fig. 1 a diagrammatic representation of an air flow control device in a machine tool for controlling the air flow between a first duct portion leading to a work area of the machine tool and a second duct portion leading to an extraction device, wherein in the position shown in Fig. 1 the valve part of the control device is in a position that blocks the second duct portion, Fig. 2 a representation corresponding to Fig. 1, only in the open position of the valve part, in which the second duct portion leading to the extraction device is open.
In the figures identical components are provided with identical reference characters.
Figs. 1 and 2 show a detail from a housing 1 for a hand-held machine tool, in particular an electrical hand-held machine tool such as for example a hand-held sanding device. Formed in the housing 1 is an air duct 2, which branches into a first duct portion 3 and a second duct portion 4. Through the air duct 2 an air flow 5 is fed from an electric drive motor of the machine tool, the air flow 5 being conveyed for cooling purposes through the motor housing and/or along the outside of the motor housing. Downstream of the drive motor the air flow 5 is diverted through the air duct 2, wherein according to Fig. 1 the flow is effected through the first duct portion 3, which leads to a work area of the machine tool, so that abraded material, for example sanding dust, is blown away by the useful flow that is usable as a blast flow.
Integrated into the housing 1 is a mechanical control device 6, which comprises a valve part 7, a bearing portion 8 and a spring element 9. The control device 6 comprising the components 7, 8, 9 is configured as an integral constructional unit, which is preferably made of plastics material and manufactured by injection moulding. The valve part 7 of the control device 6 is loaded by the spring element 9 and pressed into the position shown in Fig. 1, in which the second duct portion 4 is closed off. The valve part 7 is of a curved construction and in the position according to Fig. 1 forms a wall portion of the first duct portion 3 that leads to the work area of the machine tool.
In the blocking position according to Fig. 1 the second duct portion 4 leading to an extraction device is closed off and hence non-functioning.
The control device 6 is held in the housing 1. of the machine tool only by means of the bearing portion 8, which enables a rotatable support of the valve part 7, and the free end 9a of the spring element 9. The bearing portion 8 of the control device 6 is accommodated in a rotatable manner in a bearing eye 10 of the housing. The free end 9a of the spring element 9 is fastened in a housing recess.
The bearing portion 8 is situated between the valve part 7 and the spring element 9 and is loaded by the action of the spring element with a moment of rotation, which because of the integral construction of bearing portion 8 and valve part 7 acts also upon the valve part 7 and presses it into the position shown in Fig. 1, in which the second duct portion 4 is closed off. The spring element 9 is of an approximately S-shaped configuration and is fitted with initial tension into the housing 1.
In Fig. 2 the valve part 7 is represented in the open position, in which the valve part 7 releases the second duct portion 4 so that an air flow as represented by arrow 11 is possible. The displacement of the valve part 7 is effected by actuation of an extraction device, which generates a partial vacuum that acts upon the convexly curved outer side of the valve part 7 and displaces it counter to the action of the spring element 9 from the blocking position represented in Fig. 1 into the opening position according to Fig. 2. The effect of the air flow 11 generated by the extraction device is that the first air flow 5 coming from the motor of the machine tool is deflected into the second duct portion 4 in the direction of the extraction device. Thus, an air flow is moreover generated, which is directed away from the work area of the machine tool and conveyed in the opposite direction to Fig. 1 through the first duct portion 3 and on into the second duct portion 4 in accordance with represented air flow 11.
In this way, abraded material may be extracted from the work area.
Claims (12)
- Claims 1. Air flow control device for a machine tool, in particular for a hand-held machine tool such as for example a hand-held sanding device, comprising a valve part (7) supported displaceably in an air duct (2) for regulating the air flow (5) conveyed through the air duct (2), a bearing portion (8) for supporting the valve part (7), and a spring element (9) for loading the valve part (7), wherein the valve part (7), the bearing portion (8) and the spring element (9) are configured as an integral constructional unit.
- 2. Control device according to claim 1, characterized in that the valve part (7), the bearing portion (8) and the spring element (9) are manufactured from plastics material.
- 3. Control device according to claim 1 or 2, characterized by a configuration as a passive constructional unit, wherein the valve part (7) is to be displaced by means of different pressure-and/or flow conditions.
- 4. Control device according to one of claims 1 to 3, characterized in that the bearing portion (8) is supported in a rotatable manner.
- 5. Control device according to one of claims 1 to 4, characterized in that the bearing portion (8) is disposed between the valve part (7) and the spring element (9)
- 6. Control device according to one of claims 1 to 5, characterized in that the spring part is curved in an S-shaped manner.
- 7. Machine tool, in particular a hand-held machine tool, comprising an air flow control device (6) according to one of claims 1 to 6.
- 8. Machine tool according to claim 7, characterized in that the valve part (7) forms a wall portion of the air duct (3)
- 9. Machine tool according to claim 7 or 8, characterized in that the valve part (7) is disposed between a first air duct (3) and a second air duct (4), wherein in a first position of the valve part (7) an air duct (4) is closed off and in a second position both air ducts (3, 4) are open.
- 10. Machine tool according to one of claims 7 to 9, characterized in that a free end (9a) of the spring element (9) is fastened in a housing-fixed manner.
- 11. An air flow control device substantially as hereinbefore described with reference to and as shown in the accompanying drawings.
- 12. A machine tool substantially as hereinbefore described with reference to and as shown in the accompanying drawings.*::r: INTELLECTUAL . ... PROPERTY OFFICE Application No: GB 1110609.3 Examiner: Mr Karl Whitfield Claims searched: ito 10 Date of search: 17 October 2011 Patents Act 1977: Search Report under Section 17 Documents considered to be relevant: Category Relevant Identity of document and passage or figure of particular relevance to claims A -W02006/00233i Ai (ONE WORLD) figs 4A & 4B A -W02009/019057 Al (BOSCH) figs. 17-19 A -US6047693A (YAMAMI et al.) figs. 2 & 3 Categories: X Document indicating lack of novelty or inventive A Document indicating technological background and/or state step of the art.Y Document indicating lack of inventive step if P Document published on or after the declared priority date but combined with one or more other documents of before the filing date of this invention.same category.& Member of the same patent family E Patent document published on or after, but with priority date earlier than, the filing date of this application.Field of Search:Search of GB, EP. WO & US patent documents classified in the following areas of the UKCX Worldwide search of patent documents classified in the following areas of the IPC B23Q; B24B; B27C The following online and other databases have been used in the preparation of this search report WPI, EPODOC, TXTE, TXTT International Classification: Subclass Subgroup Valid From B24B 0055/iO Oi/Oi/2006 B23Q 0011/00 Oi/01/2006 Intellectual Property Office is an operating name of the Patent Office www.ipo.gov.uk
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102010030412A DE102010030412A1 (en) | 2010-06-23 | 2010-06-23 | Air flow control device for a machine tool |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB201110609D0 GB201110609D0 (en) | 2011-08-03 |
| GB2481530A true GB2481530A (en) | 2011-12-28 |
Family
ID=44454507
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1110609.3A Withdrawn GB2481530A (en) | 2010-06-23 | 2011-06-22 | Valve with integral bearing and spring in an air flow control device for a machine tool |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN102294653A (en) |
| DE (1) | DE102010030412A1 (en) |
| GB (1) | GB2481530A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102013202946A1 (en) * | 2013-02-22 | 2014-09-11 | Robert Bosch Gmbh | Hand tool |
| WO2014180730A1 (en) * | 2013-05-08 | 2014-11-13 | Atlas Copco Industrial Technique Ab | Over-speed safety device for a pneumatic power tool |
| DE102015201076A1 (en) * | 2015-01-22 | 2016-07-28 | Röchling Automotive SE & Co. KG | Louver device |
| CN104889944B (en) | 2015-06-15 | 2017-09-26 | 覃桂才 | A kind of electric hand tool |
| CN108436848B (en) | 2017-02-16 | 2024-02-27 | 博世电动工具（中国）有限公司 | Air pre-cleaning assembly and electric tool with same |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6047693A (en) * | 1997-06-30 | 2000-04-11 | Kioritz Corporation | Dust collector-equipped power cutter |
| WO2006002331A1 (en) * | 2004-06-23 | 2006-01-05 | One World Technologies Limited | Pre-directing insert for a bi-directional exhausting handheld planer |
| WO2009019057A1 (en) * | 2007-08-03 | 2009-02-12 | Robert Bosch Gmbh | Hand-held power tool having a dust extraction device |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10022582A1 (en) * | 2000-05-09 | 2001-11-15 | Hilti Ag | Hand tool with suction dust collector |
| DE102004019155A1 (en) * | 2004-04-21 | 2005-11-10 | Robert Bosch Gmbh | Dust collector for a hand tool |
| DE102004029220B4 (en) * | 2004-06-16 | 2006-03-23 | Hilti Ag | Hand tool with dust extraction module |
| DE102004045625A1 (en) * | 2004-09-21 | 2006-04-06 | Robert Bosch Gmbh | Suction cleaner for hand tools has cool air fan integrated in machine housing with a turbine wheel in driving connection with ventilator wheel of suction fan to be driven by emerging cool air stream |
| GB0616564D0 (en) * | 2006-08-22 | 2006-09-27 | Gmca Pty Ltd | Power tool dust and debris extraction |
-
2010
- 2010-06-23 DE DE102010030412A patent/DE102010030412A1/en not_active Withdrawn
-
2011
- 2011-06-22 GB GB1110609.3A patent/GB2481530A/en not_active Withdrawn
- 2011-06-23 CN CN201110181428A patent/CN102294653A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6047693A (en) * | 1997-06-30 | 2000-04-11 | Kioritz Corporation | Dust collector-equipped power cutter |
| WO2006002331A1 (en) * | 2004-06-23 | 2006-01-05 | One World Technologies Limited | Pre-directing insert for a bi-directional exhausting handheld planer |
| WO2009019057A1 (en) * | 2007-08-03 | 2009-02-12 | Robert Bosch Gmbh | Hand-held power tool having a dust extraction device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102294653A (en) | 2011-12-28 |
| DE102010030412A1 (en) | 2011-12-29 |
| GB201110609D0 (en) | 2011-08-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |