US20040192181A1 - Electric hand power tool - Google Patents
Electric hand power tool Download PDFInfo
- Publication number
- US20040192181A1 US20040192181A1 US10/719,753 US71975303A US2004192181A1 US 20040192181 A1 US20040192181 A1 US 20040192181A1 US 71975303 A US71975303 A US 71975303A US 2004192181 A1 US2004192181 A1 US 2004192181A1
- Authority
- US
- United States
- Prior art keywords
- power tool
- air
- handle
- hand power
- inlet
- 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
Links
- 230000001681 protective effect Effects 0.000 claims description 20
- 238000010276 construction Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
Images
Classifications
-
- 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
- B25F5/02—Construction of casings, bodies or handles
- B25F5/025—Construction of casings, bodies or handles with torque reaction bars for rotary tools
- B25F5/026—Construction of casings, bodies or handles with torque reaction bars for rotary tools in the form of an auxiliary handle
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
- B27B9/00—Portable power-driven circular saws for manual operation
Definitions
- the present invention relates to an electric hand power tool.
- air required for cooling of an electric motor is aspirated by an air impeller, which is fixedly arranged on the driven shaft of the electric motor, through an inlet slot in the power tool housing and blown through outlet slots into the powertool housing.
- Air which is supplied by the air vanes of the impeller wheel flows on the outlet edges of the outlet slots with high speed, resulting in intense noise generation in an unpleasant high frequency region.
- an electric hand power tool which has a housing; an air-cooled electric motor which is accommodated in said housing; a tool which is driven by said electric motor; a handle and an auxiliary handle for a two-hand guidance of the machine, said auxiliary handle being hollow and used as an air channel for spent air leaving said electric motor.
- the electric hand power tool When the electric hand power tool is designed in accordance with the present invention, it has the advantage that by the withdrawal of the spent air which leaves the electric motor through the hollow auxiliary handle, on the one hand the air noise is dampened in particular the unpleasant high frequency region is lowered, and on the other hand the spent air is supplied outside away from the operator, so that it does not blow on the operator during the operation of the machine.
- the air passage is formed in the housing and provided with an air inlet opening for the motor spent air, which opens into the inlet of the auxiliary handle.
- the air passage is formed screw-shaped or spiral-against shaped with an inner diameter which continually increases toward the inlet of the hollow auxiliary handle.
- the channel operates as an unloading space, whereby a high air quantity with a reduced flow speed can be transported for additionally significantly reducing the noise generation.
- the screw-shaped construction is advantageous for the case, in which the rotary direction of the electric motor and thereby of the motor impeller is opposite to the rotary direction of the tool.
- the auxiliary handle or an outlet pipe which surrounds an outlet of the auxiliary handle is formed turnable.
- the outflow of the motor spent air is adjusted so that it can not flow unpleasantly to the operator in any work application.
- the hollow auxiliary handle is formed as a bracket handle, which in the electric hand power tool with a rotatable tool at least partially covered by a protective hood, is placed with one handle end on the protective hood, while at or near its another end it is fixed on a housing part of the housing which accommodates the electric motor, and its inlet is located under the protective hood.
- FIG. 1 is a view showing an electric hand circular power saw in accordance with the present invention
- FIG. 2 is a plan view of the electric hand circular power saw of FIG. 1 without a support plate;
- FIG. 3 is a side view of the electric hand circular power saw of FIG. 2 after a removal of the protective hood and a circular saw blade;
- FIG. 4 is a side view of the electric hand power tool of FIG. 1 with a removed protective hood for a circular saw blade.
- An electric hand circular power saw is shown in the drawings as an example for an electric hand power tool for chip-removing or grinding treatment of workpieces. It has a two-shell housing 10 with a handle 11 formed on it for guiding and handling of the power tool and with a motor housing 12 placed on it and accommodating an air-cool electric motor.
- the electric motor drives a drive shaft 13 through a not shown one-stage transmission, and a saw blade 14 is mounted on the drive shaft.
- the circular saw blade 14 is covered in an upper region by a protective hood 15 which is screwed to the housing 10 .
- the protective hood 15 extends to a support plate 16 which is connected with the machine housing 10 .
- the support plate 16 is used for placing the power tool on the workpiece during a sawing process.
- the circular saw blade 14 extends through the support plate 16 and projects beyond it, downwardly more or less depending on a desired cutting depth.
- the support plate 16 is turnable about a turning axle which is fixed on the machine housing 10 forwardly on the circular saw blade 14 as seen in a working direction.
- the selected turning position is fixed by an adjusting device.
- a second adjusting device 17 is arranged on the support plate 18 , and by turning the support plate 16 around a longitudinal axis extending parallel to the saw blade plane, enables a cutting angle adjustment of the power tool.
- the power tool has an auxiliary handle 21 . It is formed as a bracket handle and arranged forwardly of the drive shaft 13 of the circular saw blade 14 as considered in the working direction of the power tool, near its front region on the machine housing 10 .
- the auxiliary handle which is identified herein below as the bracket handle 21 . Its one handle end is placed on the protective hood 15 . Its gripping region 211 which is substantially parallel to the rotary axis of the circular saw blade 14 , extends above the support plate 16 at a distance from it. Its another gripping end is fixed on the motor housing 12 . Thereby a very solid mechanical connection of the bracket handle 21 on the machine housing 10 is guaranteed.
- the power tool can be placed very accurately planely on the workpiece, and during sawing can be held and guided very well with two hands.
- the great gripping region of the bracket handle 21 provides an ergonomic and reliable handling of the power tool in all work applications, both for a right-handed and a left-handed person. Moreover, it is possible to support the power tool with the bracket handle 21 in its center of gravity.
- the bracket handle 21 is hollow and has an inlet 22 which is open to the interior of the protective hood 15 as shown in FIGS. 3 and 4. It also has an outlet 23 arranged behind the handle region 211 as shown in FIGS. 1 and 2. Preferably the outlet 23 is located at or near the end of the bracket handle 21 which faces away from the inlet 22 .
- the outlet 23 is closed by an outlet pipe 24 which can be formed preferably turnable.
- the motor housing 12 has air inlet slots 25 shown in FIG. 25. Air which is aspirated by a not shown air impeller connected for rotation with the driven shaft of the electric motor is aspirated through the air inlet slots.
- the air which is aspirated by the air impeller passes through the electric motor and is blown out as a heat-withdrawing motor spent air, and it is guided so that it flows into the inlet 22 of the hollow bracket handle 21 .
- an air passage 26 is formed in the housing 10 . It expands toward the inlet 22 of the bracket handle 21 and opens into the inlet 22 as shown in FIG. 3.
- the air is blown by the air impeller from the interior of the electric motor into an air inlet opening of the air passage 26 which is covered in FIG. 3.
- the motor spent air flows, as shown by the arrow 27 in FIG. 3, through the air passage 26 of the hollow bracket handle 21 , and is discharged through the outlet 23 which is formed in the bracket handle 21 and surrounded by the outlet pipe 24 .
- the outlet pipe 24 is oriented so that the flow direction of the motor spent air flowing out here is oriented away from the operator of the power tool.
- the outlet pipe 24 is turnably movable, the operator can individually adjust the air discharge device as convenient to him or as necessary for the work applications.
- a one-stage transmission is arranged between the electric motor and the drive shaft 13 of the circular saw blade 14 , the rotary directions of the rotor of the electric motor and the circular saw blade 14 are inverted.
- the rotary direction of the circular saw blade 14 is identified in FIG. 4 by the arrow 28 .
- the air passage 26 is closed and formed screw-shaped, as can be seen partially in FIG. 3. It extends from its air inlet opening to the inlet 22 of the bracket handle 21 as an axially expanding spiral, wherein the throughgoing diameter of the air passage 26 is preferably continuously increased.
- the two-shell housing 10 is injection molded of synthetic plastic. At least the handle 11 and the air passage 22 are molded together in the same way.
- the bracket handle 21 is formed as an insert part, but in certain circumstances can be also molded.
- the screw-shaped air passage 26 which expands toward the inlet 22 of the bracket handle 21 is molded on parts in both shells, so as to complete the air passage 26 when the shells are assembled with one another.
- the bracket handle 21 is formed turnable around its inlet 22 and is arrestable in any of adjusted turning positions. Thereby, in addition to the possibility of adjusting the noise radiating direction, also an ergonomic effect is obtained.
- the invention is not limited to the specific electric hand circular power saw. It can be used for all hand-guided electric power tools with rotatable tools such as for example masonry mills? rock saws, angle grinders, concrete grinders, eccentric grinders, etc.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Sawing (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/318,968 US7207874B2 (en) | 2002-11-22 | 2005-12-27 | Electric hand power tool |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10254578 | 2002-11-22 | ||
DE10254578.2 | 2002-11-22 | ||
DE10305034.5 | 2003-02-07 | ||
DE10305034A DE10305034A1 (de) | 2002-11-22 | 2003-02-07 | Elektrohandwerkzeugmaschine |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/318,968 Continuation-In-Part US7207874B2 (en) | 2002-11-22 | 2005-12-27 | Electric hand power tool |
Publications (1)
Publication Number | Publication Date |
---|---|
US20040192181A1 true US20040192181A1 (en) | 2004-09-30 |
Family
ID=32231884
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/719,753 Abandoned US20040192181A1 (en) | 2002-11-22 | 2003-11-21 | Electric hand power tool |
US11/318,968 Expired - Fee Related US7207874B2 (en) | 2002-11-22 | 2005-12-27 | Electric hand power tool |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/318,968 Expired - Fee Related US7207874B2 (en) | 2002-11-22 | 2005-12-27 | Electric hand power tool |
Country Status (4)
Country | Link |
---|---|
US (2) | US20040192181A1 (de) |
EP (1) | EP1422008B1 (de) |
CN (1) | CN100446937C (de) |
DE (1) | DE50309102D1 (de) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090145621A1 (en) * | 2007-12-07 | 2009-06-11 | James Ching Sik Lau | power tool |
US20090320301A1 (en) * | 2008-06-30 | 2009-12-31 | Hilti Aktiengesellschaft | Hand-held circular saw |
US20110250825A1 (en) * | 2010-04-08 | 2011-10-13 | Mark Smith | Tool for removing grout, mortar and the like |
JP2016055402A (ja) * | 2014-09-12 | 2016-04-21 | パナソニックIpマネジメント株式会社 | 電動丸鋸 |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7526866B2 (en) * | 2003-10-31 | 2009-05-05 | Black & Decker Inc. | Variable dust chute for circular saws |
DE102010041352A1 (de) * | 2010-09-24 | 2012-03-29 | Hilti Aktiengesellschaft | Handgeführtes Elektrowerkzeuggerät mit einem Absaugadapter |
JP5885557B2 (ja) * | 2012-03-28 | 2016-03-15 | リョービ株式会社 | 切断機 |
CN107855593B (zh) * | 2017-10-20 | 2023-04-11 | 向广宏 | 手持集尘切割机 |
US10875109B1 (en) | 2018-04-30 | 2020-12-29 | Kreg Enterprises, Inc. | Adaptive cutting system |
CN111300323B (zh) * | 2020-03-18 | 2021-07-20 | 山东铭航机械科技有限公司 | 一种具有固定作用的电动扳手 |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1749705A (en) * | 1928-02-06 | 1930-03-04 | Nathan S Lewin | Abrading device |
US2418429A (en) * | 1942-05-12 | 1947-04-01 | Union Special Machine Co | Sewing machine |
US4414743A (en) * | 1980-12-11 | 1983-11-15 | Black & Decker Inc. | Circular saw |
US5077942A (en) * | 1990-05-04 | 1992-01-07 | Atlas Copco Tools Ab | Vibration damped hand held rotary grinding machine |
US5315193A (en) * | 1990-02-02 | 1994-05-24 | Robert Bosch Gmbh | Hand-guided machine tool comprising a radial blower |
US5595532A (en) * | 1995-10-20 | 1997-01-21 | Waxing Corporation Of America, Inc. | Electrically-powered polisher |
US6447387B1 (en) * | 2001-02-13 | 2002-09-10 | Ming-Qun Tseng | Exhaust assembly for a pneumatic sanding device |
US6543549B1 (en) * | 1999-05-28 | 2003-04-08 | Hilti Aktiengesellschaft | Electrically driven hand-held tool |
US6688349B2 (en) * | 2002-03-08 | 2004-02-10 | Robert Bosch Gmbh | Hand planing machine |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE644011C (de) * | 1935-03-30 | 1937-04-22 | Carl Sauer | Nutenfraesmaschine |
US4281457A (en) * | 1979-10-17 | 1981-08-04 | Black & Decker Inc. | Vacuum-operated cutting tool and system therefor |
ES2253863T3 (es) * | 1998-08-13 | 2006-06-01 | Black & Decker Inc. | Sierra circular portatil, accionada por baterias, con control de profundidad de corte. |
-
2003
- 2003-11-20 DE DE50309102T patent/DE50309102D1/de not_active Expired - Lifetime
- 2003-11-20 EP EP03026679A patent/EP1422008B1/de not_active Expired - Lifetime
- 2003-11-21 CN CNB2003101240803A patent/CN100446937C/zh not_active Expired - Fee Related
- 2003-11-21 US US10/719,753 patent/US20040192181A1/en not_active Abandoned
-
2005
- 2005-12-27 US US11/318,968 patent/US7207874B2/en not_active Expired - Fee Related
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1749705A (en) * | 1928-02-06 | 1930-03-04 | Nathan S Lewin | Abrading device |
US2418429A (en) * | 1942-05-12 | 1947-04-01 | Union Special Machine Co | Sewing machine |
US4414743A (en) * | 1980-12-11 | 1983-11-15 | Black & Decker Inc. | Circular saw |
US5315193A (en) * | 1990-02-02 | 1994-05-24 | Robert Bosch Gmbh | Hand-guided machine tool comprising a radial blower |
US5077942A (en) * | 1990-05-04 | 1992-01-07 | Atlas Copco Tools Ab | Vibration damped hand held rotary grinding machine |
US5595532A (en) * | 1995-10-20 | 1997-01-21 | Waxing Corporation Of America, Inc. | Electrically-powered polisher |
US6543549B1 (en) * | 1999-05-28 | 2003-04-08 | Hilti Aktiengesellschaft | Electrically driven hand-held tool |
US6447387B1 (en) * | 2001-02-13 | 2002-09-10 | Ming-Qun Tseng | Exhaust assembly for a pneumatic sanding device |
US6688349B2 (en) * | 2002-03-08 | 2004-02-10 | Robert Bosch Gmbh | Hand planing machine |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090145621A1 (en) * | 2007-12-07 | 2009-06-11 | James Ching Sik Lau | power tool |
US8418780B2 (en) | 2007-12-07 | 2013-04-16 | Johnson Electric S.A. | Power tool |
US20090320301A1 (en) * | 2008-06-30 | 2009-12-31 | Hilti Aktiengesellschaft | Hand-held circular saw |
US20110250825A1 (en) * | 2010-04-08 | 2011-10-13 | Mark Smith | Tool for removing grout, mortar and the like |
US8747190B2 (en) * | 2010-04-08 | 2014-06-10 | Mark Smith | Tool for removing grout, mortar and the like |
JP2016055402A (ja) * | 2014-09-12 | 2016-04-21 | パナソニックIpマネジメント株式会社 | 電動丸鋸 |
Also Published As
Publication number | Publication date |
---|---|
US7207874B2 (en) | 2007-04-24 |
DE50309102D1 (de) | 2008-03-20 |
US20060141914A1 (en) | 2006-06-29 |
EP1422008A1 (de) | 2004-05-26 |
CN1506195A (zh) | 2004-06-23 |
CN100446937C (zh) | 2008-12-31 |
EP1422008B1 (de) | 2008-01-30 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: ROBERT BOSCH GMBH, GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:BOHNE, ULRICH;HILD, EUGEN;ROEHM, HEIKO;REEL/FRAME:014681/0036;SIGNING DATES FROM 20031128 TO 20031201 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |