GB2382388A - Electric power tool with gear shift slide for two-speed gear unit - Google Patents
Electric power tool with gear shift slide for two-speed gear unit Download PDFInfo
- Publication number
- GB2382388A GB2382388A GB0222370A GB0222370A GB2382388A GB 2382388 A GB2382388 A GB 2382388A GB 0222370 A GB0222370 A GB 0222370A GB 0222370 A GB0222370 A GB 0222370A GB 2382388 A GB2382388 A GB 2382388A
- Authority
- GB
- United Kingdom
- Prior art keywords
- leaf spring
- shift slide
- shift
- gear unit
- gear
- 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
Links
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
- B25F5/001—Gearings, speed selectors, clutches or the like specially adapted for rotary tools
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H3/00—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion
- F16H3/44—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion using gears having orbital motion
- F16H3/46—Gearings having only two central gears, connected by orbital gears
- F16H3/48—Gearings having only two central gears, connected by orbital gears with single orbital gears or pairs of rigidly-connected orbital gears
- F16H3/52—Gearings having only two central gears, connected by orbital gears with single orbital gears or pairs of rigidly-connected orbital gears comprising orbital spur gears
- F16H3/54—Gearings having only two central gears, connected by orbital gears with single orbital gears or pairs of rigidly-connected orbital gears comprising orbital spur gears one of the central gears being internally toothed and the other externally toothed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
- F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
- F16H63/04—Final output mechanisms therefor; Actuating means for the final output mechanisms a single final output mechanism being moved by a single final actuating mechanism
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
- F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
- F16H63/30—Constructional features of the final output mechanisms
- F16H63/38—Detents
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
- F16H59/02—Selector apparatus
- F16H59/04—Ratio selector apparatus
- F16H59/041—Ratio selector apparatus consisting of a final output mechanism, e.g. ratio selector being directly linked to a shiftfork
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Gear-Shifting Mechanisms (AREA)
- Portable Power Tools In General (AREA)
- Drilling And Boring (AREA)
- Structure Of Transmissions (AREA)
Abstract
An electric power tool has a gear shift slide 9 which is displaceable in an axial direction on a tool housing 8 and is connected to a ring gear 6 by a wire bow 14 so that an axial force exerted on the shift slide 9 may transmitted to the ring gear 6. So that the shift slide 9 experiences a definite latching into place in both gear speed positions, a leaf spring 19 extending at right angles to the direction of displacement is provided, which is fastened by two ends to fixed supports 20, 21. A centre of the leaf spring 19, eg of flat or meandering form, is non-positively connected to an arm 22 on the shift slide 9 so that the leaf spring 19 assumes two stable positions and a definite latching takes place as soon as the leaf spring 19 is pushed beyond its central position. A user therefore senses that a selected speed has been engaged and as the leaf spring 19 tilts over from one position to the other it produces an audible clicking noise.
Description
1 2382388
Apparatus for shifting two-speed gear unit of an electric tool Background art
The present invention relates to an apparatus for shifting a two-speed gear unit of an electric tool, comprising a shift slide, which is mounted displaceably on the tool housing, is movable into two shift positions and is in working connection with a displaceable part of the gear unit. Such a shift apparatus for a two-speed gear unit of an electric tool is known from DE 39 04 085 Al.
Fastened to the shift slide mounted displaceably in the tool housing is a bow, which engages into an axially displaceable shift gear forming part of the gear unit. The gear shift bow possesses the properties of a spring element and therefore has the effect that, upon actuation of the shift slide, the displaceable shift gear engages with its teeth into a fixed gear whee] as soon as the next tooth/tooth space position between the shift gear and the gear wheel is reached.
Said known shift slide has no means of allowing it to latch in a clearly identifiable manner into the one or the other shift position.
Advantages of the invention The initially described apparatus for shifting a multi-speed gear unit of an electric tool comprises a leaf spring, which extends at right angles to the direction of displacement of the shift slide and is fastened by its two ends to supports, which are not movable with the shift slide, wherein the length of the leaf spring is greater than the distance between the two supports. The shift slide is non-positively connected to said leaf spring. Since such a leaf spring provided with an overlength between the supports has two stable positions, it
lends the shift slide connected thereto likewise two stable latching positions.
For the user, therefore, the shift slide after being slid forward and/or back reaches in each case a clearly identifiable latching position. The shift slide is held securely in each latching position of the shift slide, in which one of two speeds of a two-speed gear unit is selected, so that unintentional jumping of the gear unit out of the respective selected speed is prevented.
The leaf spring moreover has the effect that it produces an audible clicking noise when it is moved into the one or the other stable position. This serves as an indication to the user that he has deEmitely reached the desired shift position through actuation of the shift slide.
Advantageous constructions of the invention arise from the sub-claims.
In order to realize as far a displacement travel as possible for the shift slide between the individual shift positions, it is advantageous to shape the leaf spring in such a way that it has a meander-shaped course.
The leaf spring may also comprise two partial leaf springs, wherein in each case one end of each partial leaf spring is connected to the shift slide and the other end is connected to one of the supports.
Drawings There now follows a detailed description of several embodiments of the
invention, which are illustrated in the drawings. The drawings show: Figure 1 a cross section through a gear unit of an electric tool with a shift slide for shifting the gear unit,
Figures 2a and 2b two shift positions of the shift slide, which is connected to a flat leaf spring, Figures 3a and 3b two shift positions of the shift slide, which is connected to a leaf spring with a meandershaped course, Figures 4a and 4b two shift positions of the shift slide, which is connected to two meander-shaped partial leaf springs, and Figures 5a and 5b two shift positions of the shift slide, which is connected to two flat partial leaf springs.
Description of embodiments
Figure 1 shows a cross section through a planetary gear unit of an electric tool, e.g. of a drilling screwdriver. The planetary gear unit in a known manner, such as emerges from DE 39 04 085 Al, comprises a sun wheel 1, which is connected non-rotatably to a drive shaft 2 of an electric motor, a plurality of planet wheels 3, 4 and 5 meshing with the sun wheel 1, and a ring gear 6, which surrounds the planet wheels and the sun wheel and with which the planet wheels 3, 4, 5 mesh. The entire gear unit is enclosed in a gearbox 7. The ring gear 6 is mounted so as to be displaceable in axial direction of the drive shaft 2.
Said axially displaceable ring gear 6 is used to change the speed of the, here two-speed, planetary gear unit.
In a first position the ring gear 6 is meshed with non-illustrated gearing on the gearbox 7 so as to be held locked against rotation and the planet wheels 3, 4 and 5 driven by the sun wheel 1 rotate in the internal gearing of the ring gear 6.
In a second position the ring gear is not held at the gearbox 7 but corotates with the planet wheels 3, 4 and 5. Depending on which of the two described positions the ring gear 6 occupies, a different rotational speed is transmitted from the drive shaft 2 to a non-illustrated spindle of the electric tool.
Figure 1 also shows, in a cutout manner, the tool housing 8 which accommodates the two-speed gear unit.
The axial displacement of the ring gear 6 into the one or the other of the two speeds of the gear unit is effected by means of a shift slide 9, which is displaceable in axial direction on the tool housing 8. The shift slide 9 is guided e.g. in two rails 10 and 11 formed on the tool housing 8 and extending in sliding direction. The shift slide 9 at the top has a handle 13, which protrudes from an opening 12 of the tool housing 8 and allows the user of the electric tool to actuate the shift slide 9. Connected to the shift slide 9 is a bow 14 manufactured e.g. from a wire, which with its two arms partially embraces the gearbox 7 and engages into the gear unit through mutually opposing holes 15 and 16 in the gearbox 7 so that the ends 17 and 18 of the bow 14 grasp the ring gear 6. The bow ends 17 and 18 may engage e.g. into a non-illustrated slot in the outer wall of the ring gear 6. Thus, via the bow 14 an axial force exerted upon the shift slide 9 may be transmitted to the ring gear 6. The ring gear 6 is accordingly, Trough actuation of the shift slide 9, displaced axially into the one or the other of the two speed positions.
The shift slide 9 is to latch clearly into each of the two speed positions. On the one hand, this is to allow the user to sense that the desired speed position has been reached and, on the other hand, with latching-in of the shift slide 9 the ring gear 6 is to be held securely in the selected speed position in order to prevent its self-release from said position. The means of fulfilling said
requirements are shown by way of example in Figures 2a, 2b or 3a, 3b or 4a, 4b or 5a, 5b, which show a plan view of a cutout of the tool housing 8 in the direction of the shift slide 9. In Figures 2a, 2b to 5a, fib the same reference characters have been used for the parts described in connection with Figure 1.
As Figures 2a, 2b reveal, a leaf spring 19 extending at right angles to the direction of displacement of the shift slide 9 is disposed in the tool housing 8.
Said leaf spring 19 is visible through a breach of the housing drawn in Figures 2a and 2b. The two ends of the leaf spring 19 are fastened to supports 20 and 21, which are not movable with the shift slide 9. Said supports 20 and 21 may be e.g. pins, which are formed on the tool housing 8 and around which the ends of the leaf spring 19 are bent. Another possible way of fastening the spring ends is e.g. to insert or clamp them into supports 20, 21.
The shift slide 9 is non-positively connected to the leaf spring 19, preferably midway between the two supports 20 and 21, by an ann 22 provided on the shift slide 9 and extending in the axial direction of displacement. The length of the leaf spring 19 is greater than the distance between the two supports 20 and 21. This produces the effect whereby the leaf spring 19 may assume two stable positions. This likewise provides the shift slide 9 connected to the leaf spring 19 with two stable detent positions, which correspond to the two speeds of the gear unit. Figures 2a and 2b illustrate the two stable detent positions. As soon as the leaf spring l9 is pushed by the shift slide 9 beyond its central position between the two supports 20 and 21, the shift slide 9 automatically speeds into its end position selected by Me user. The user therefore clearly senses that the selected speed of the gear unit is definitely engaged.
The leaf spring 19 moreover has the further effect that, when it tilts over from one position into the other, it produces a clicking noise, which also audibly indicates to the user that the desired speed change has been effected.
The displacement force, which has to be applied to the shift slide 9 in order to change from one gear speed to another, depends upon the cross section, length and material of the leaf spring 19. The displacement travel for the shift slide 9 is determined by the overlength of the leaf spring 19, i.e. by the length of the leaf spring 19 minus the distance between the two supports 20 and 21. In order to realize as great a displacement travel as possible for the shift slide 9, it is advantageous to use, not a flat leaf spring 19 as illustrated in Figures 2a and 2b, but a leaf spring 19' with a meander-shaped course as illustrated in Figures 3a and 3b. Figures 3a and 3b, like Figures 2a and 2b, show the two shift positions of the, in said case, meander-shaped leaf spring 19' and of the shift slide 9.
The leaf spring may be a one-piece spring, as illustrated in Figures 2a, 2b and 3a, 3b, or may alternatively comprise two partial leaf springs 23, 24 and 23', 24' in accordance with the views in Figures 4a, 4b and 5a, 5b respectively. In each case, one end of each partial leaf spring 23, 24 or 23', 24' is fastened to the arm 22 of the shift slide 9 and the other end is fastened to one of the fixed supports 20, 21. According to the embodiment illustrated in Figures 4a, 4b, the partial leaf springs 23 and 24 are meander-shaped. In the embodiment illustrated in Figures 5a, fib, on the other hand, the partial leaf springs 23' and 24' are flat in shape. Said partial leaf springs 23' and 24' have the advantage of being easy to manufacture and capable of absorbing a high alternating load (frequent shift activity). The actual inventive idea, which consists of realizing the two detent positions of a shift slide 9, which correspond to the two gear speeds, by means of a leaf
spring 19, 19', is independent of the design of the gear unit installed in the electric tool, which may for example take the fonn of a planetary gear unit as described above.
Claims (5)
1. Apparatus for shifting a two-speed gear unit of an electric tool, comprising a shift slide (9), which is mounted displaceably on the tool housing (8), is movable into two shift positions and is in working connection with a displaceable part (6) of the gear unit, characterized in that a leaf spring (19, 19', 23, 24, 23', 24'), which extends at right angles to the direction of displacement, is fastened by its two ends to supports (20, 21), which are not movable with the shift slide (9), wherein the length of the leaf spring (19, 19', 23, 24, 23', 24') is greater than the distance between the two supports (20, 21) and that the leaf spring (19, 19', 23, 24, 23', 24') is connected non-positively to the shift slide (9).
2. Apparatus according to claim 1, characterized in that the leaf spring comprises two partial leaf springs (23, 24, 23', 24'), wherein in each case one end of each partial leaf spring (23, 24, 23', 24') is connected to the shift slide (9) and the other end is connected to one of the supports (20, 21).
3. Apparatus according to claim 1 or 2, characterized in that the leaf spring (19, 23', 24') is flat.
4. Apparatus according to claim I or 2, characterized in that the leaf spring (19', 23, 24) is meander-shaped.
5. An apparatus for shifting a two-speed gear unit substantially as herein described with reference to the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2001149382 DE10149382C1 (en) | 2001-10-06 | 2001-10-06 | Device for switching a two-stage transmission of a power tool |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB0222370D0 GB0222370D0 (en) | 2002-11-06 |
| GB2382388A true GB2382388A (en) | 2003-05-28 |
| GB2382388B GB2382388B (en) | 2004-03-17 |
Family
ID=7701660
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0222370A Expired - Fee Related GB2382388B (en) | 2001-10-06 | 2002-09-26 | Apparatus for shifting a two speed gear unit of an electric tool |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP4358496B2 (en) |
| CN (1) | CN1298513C (en) |
| DE (1) | DE10149382C1 (en) |
| GB (1) | GB2382388B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008064221A1 (en) * | 2008-12-22 | 2010-07-01 | Koki Technik Transmission Systems Gmbh | shift fork |
| CN102712085A (en) * | 2010-01-12 | 2012-10-03 | 罗伯特·博世有限公司 | Hand-operated power tool having a planetary gear |
| US11059160B2 (en) | 2011-07-29 | 2021-07-13 | Black & Decker Inc. | Multispeed power tool |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE525188C2 (en) * | 2003-03-03 | 2004-12-21 | Atlas Copco Tools Ab | Power tool with reversing gear adjustable with actuator |
| DE102008044273B4 (en) * | 2008-12-02 | 2019-10-02 | Robert Bosch Gmbh | Hand tool with a switchable gearbox |
| DE102009005248A1 (en) * | 2009-01-13 | 2010-07-15 | C. & E. Fein Gmbh | Power tool with switchable gearbox |
| DE202009017006U1 (en) * | 2009-12-16 | 2010-04-01 | Koki Technik Transmission Systems Gmbh | Welded shift linkage |
| DE102009054927A1 (en) * | 2009-12-18 | 2011-06-22 | Robert Bosch GmbH, 70469 | Hand tool machine, in particular cordless hand tool machine |
| DE102009060929A1 (en) * | 2009-12-23 | 2011-06-30 | C. & E. Fein GmbH, 73529 | Hand tool has housing, drive motor and motor shaft, which is accommodated in housing, where motor shaft is coupled with drive shaft, and gear and switching device are coupled by switching spring |
| JP5649500B2 (en) * | 2011-04-05 | 2015-01-07 | 株式会社マキタ | Electric tool |
| JP5963136B2 (en) * | 2012-09-13 | 2016-08-03 | パナソニックＩｐマネジメント株式会社 | Electric tool |
| DE102013207305A1 (en) * | 2012-10-08 | 2014-04-10 | Robert Bosch Gmbh | Powered hand tool i.e. cordless drill, has transmission part designed as planetary gear that is provided with planetary stages for switching between first and second gears, and switching ring switching between first and second gears |
| CN106312957B (en) * | 2015-07-06 | 2018-12-28 | 浙江格致工具有限公司 | Power tool |
| CN112936191A (en) * | 2019-12-10 | 2021-06-11 | 苏州宝时得电动工具有限公司 | Hand-held power tool |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3729822A (en) * | 1972-03-09 | 1973-05-01 | Singer Co | Sabre saws with lockable swivel saw bars |
| US4592144A (en) * | 1984-06-22 | 1986-06-03 | The Singer Company | Molded scroller saw lock button spring |
| GB2335011A (en) * | 1998-03-04 | 1999-09-08 | Scintilla Ag | Planetary gearing for a manually operated machine tool |
| US6186709B1 (en) * | 1999-04-01 | 2001-02-13 | Mobiletron Electronics Co., Ltd. | Speed change control structure for an electric tool |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6142211U (en) * | 1984-07-30 | 1986-03-18 | リョービ株式会社 | Rotary power tool gearbox |
| DE3904085A1 (en) * | 1989-02-11 | 1990-08-23 | Licentia Gmbh | Electric tool with a multi-step reduction gear and with a device, actuable at standstill, for changing the gear |
| JP2001146964A (en) * | 1999-11-22 | 2001-05-29 | Mitsubishi Electric Corp | Automatic transmission device of gear type transmission |
-
2001
- 2001-10-06 DE DE2001149382 patent/DE10149382C1/en not_active Expired - Fee Related
-
2002
- 2002-09-26 GB GB0222370A patent/GB2382388B/en not_active Expired - Fee Related
- 2002-09-30 CN CNB021457034A patent/CN1298513C/en not_active Expired - Fee Related
- 2002-10-03 JP JP2002291547A patent/JP4358496B2/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3729822A (en) * | 1972-03-09 | 1973-05-01 | Singer Co | Sabre saws with lockable swivel saw bars |
| US4592144A (en) * | 1984-06-22 | 1986-06-03 | The Singer Company | Molded scroller saw lock button spring |
| GB2335011A (en) * | 1998-03-04 | 1999-09-08 | Scintilla Ag | Planetary gearing for a manually operated machine tool |
| US6186709B1 (en) * | 1999-04-01 | 2001-02-13 | Mobiletron Electronics Co., Ltd. | Speed change control structure for an electric tool |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008064221A1 (en) * | 2008-12-22 | 2010-07-01 | Koki Technik Transmission Systems Gmbh | shift fork |
| US20110314948A1 (en) * | 2008-12-22 | 2011-12-29 | Bernd Schulze | Shift fork |
| US8978505B2 (en) * | 2008-12-22 | 2015-03-17 | Koki Technik Transmission Systems Gmbh | Shift fork |
| DE102008064221B4 (en) * | 2008-12-22 | 2016-03-17 | Koki Technik Transmission Systems Gmbh | shift fork |
| CN102712085A (en) * | 2010-01-12 | 2012-10-03 | 罗伯特·博世有限公司 | Hand-operated power tool having a planetary gear |
| US9097331B2 (en) | 2010-01-12 | 2015-08-04 | Robert Bosch Gmbh | Hand-held power tool having a planetary gearbox |
| CN102712085B (en) * | 2010-01-12 | 2016-06-08 | 罗伯特·博世有限公司 | There is the manual electric tool of planetary transmission |
| US11059160B2 (en) | 2011-07-29 | 2021-07-13 | Black & Decker Inc. | Multispeed power tool |
| US12011814B2 (en) | 2011-07-29 | 2024-06-18 | Black & Decker Inc. | Multispeed power tool |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2382388B (en) | 2004-03-17 |
| CN1411958A (en) | 2003-04-23 |
| DE10149382C1 (en) | 2003-05-08 |
| CN1298513C (en) | 2007-02-07 |
| JP4358496B2 (en) | 2009-11-04 |
| JP2003136433A (en) | 2003-05-14 |
| GB0222370D0 (en) | 2002-11-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20120926 |