WO1993015863A1 - A device for switching the revolutions of electrical, two-speed, percussion and reversible hand drilling machine - Google Patents

A device for switching the revolutions of electrical, two-speed, percussion and reversible hand drilling machine

Info

Publication number
WO1993015863A1
WO1993015863A1 PCT/BG1993/000003 BG9300003W WO9315863A1 WO 1993015863 A1 WO1993015863 A1 WO 1993015863A1 BG 9300003 W BG9300003 W BG 9300003W WO 9315863 A1 WO9315863 A1 WO 9315863A1
Authority
WO
WIPO (PCT)
Prior art keywords
switching
button
pin
strap
clutch
Prior art date
Application number
PCT/BG1993/000003
Other languages
French (fr)
Inventor
Hristo Pavlov Bochev
Nikolaj Ivanov Ganchev
Original Assignee
Eltos Company
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 Eltos Company filed Critical Eltos Company
Publication of WO1993015863A1 publication Critical patent/WO1993015863A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B45/00—Hand-held or like portable drilling machines, e.g. drill guns; Equipment therefor
    • B23B45/008—Gear boxes, clutches, bearings, feeding mechanisms or like equipment
    • 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
    • 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

Definitions

  • the present invention relates to a device for switching the revolutions of electrical, two-speed, percussion and reversible hand drilling machine wherein the switching is accomplished in idle, or in motion time and the device is finding application in the manufacture of hand electrical tools.
  • a device for switching the revolutions comprising a switching clutch, mounted on slots over a worlking spindle, over which spindle on both sides of the clutch are freely mounted driven gears.
  • the driven gears are permanently engaged to the driving gears on a countershaft.
  • the freely mounted driven gears are axialy fixed by the reducer body and the remote pins passing freely through the apertures of the switching clutch body.
  • the switching clutch represents a cylindrical body with a circular channel and a central slot aperture, into which from both sides are mounted spring pins movable parallely to the central slot aperture. The pins are able to .enter into the respective apertures of the driven gears mounted on the working spindle.
  • the displacement of the clutch is realized through the U-shaped strap, mounted in an axle parallel to the spindle, whereas one of its arms is located in the circular channel of the clutch.
  • a pin immovably and eccentricaly fixed in the front part of the switching button stem mounted into the aperture of the reducer body.
  • the pin is located in a channel shaped in the flat part of the U-strap, contacting frontaly the switching button.
  • the switching button possesses a rotational capability of 130° and is provided with an element fixing two extreme positions.
  • the disadvantage of the known device is the low switching reliability owing to the separate control of the mutualy coupled elements mostly located in the ro tating clutch. All this is involving in the large overall dimensions of the clutch, the great number of details and parts as well as clearances harmful for the switching process.
  • the task of the present invention is the realization of a device for switching the revolutions of electrical, two-speed, percussion and reversible hand drilling machine possessing high reliability and security of the switching in idle as well as in motion time, with a simplified and technologicaly appropriated construction.
  • this task is achieved with a device comprising a switching frontal gear clutch mounted between two driven gears freely set on the wording spindle and permanently engaged to the driving gears axialy fixed to the body and in between separated through a one-side slotted spacer bush.
  • a circular channel into which is located the arm of an U-shaped strap monted to the axle fixed to the body and parallel to the working spindle.
  • the U-shaped strap is connected by means of a pin to the switching button mounted to the body, possessing an element fixing by rotation two extreme positions.
  • the pin is mounted to the stem of the button, which geometrical axle is perpendicular to the axle iixed to the body.
  • the pin is perpendiculary orientated to the geometrical axle of the button and is spring-fitted into a blind hole one-side bored in the stem, to which opposite to the pin is shaped a cammed surface.
  • the pin is in contact with the internal surface of the U-shaped strap bended around the button stem.
  • the device according to the invention are as follows: a switching security is provided in idle as well as in motion time; the narmfull effect oi tr.e clearances during the switching process is avoided; the construction is simplified and the overall demensions of the elements o: the device are reduced. All these effects are achieved through the concentration of the control of the switching clutch outside of the rotating parts, which enables a strengthening of the switching power and the maintenance of a constant stress level between the joints of the different elements.
  • Fig. 1 General view of the drilling machine with a partial section, showing the disposition of the rotor, the countershaft (the secondary shaft) and the spindle.
  • Fig. 2 General view of the reducer with a partial section showing the disposition of the gears, the spindle, the clutch, the spacer bush, the U-shaped strap and the switching button.
  • FIG. 3 Section A-A, showing the form and the disposition of the U-shaped strap, the spring pin and the switching button.
  • Fig. 4 Diagram of the dispositionof the details while swi tching on first speed .
  • Fig. 5 Diagram of the disposition of the details while switching on second speed.
  • the device for switching the revolutions of electrical two-speed, percussion and reversible hand drilling machine consists of the following elements: switching frontal gear clutch (2 ⁇ with tooths (3) mounted on slots over the working spindle (1) located between the driven gears (4) and (5) freely mounted on the spindle (1) with frontal channels (6) and (7), which driven gears are axialy fixed to the body (8) spaced by the one-side slotted spacer bush (9).
  • the clutch (2) is provided by a circular channel (cannelure) (10) so as to upon the outside surfaces (11) is mounted the one-side slotted spacer bush (9).
  • the driven gears are permanently engaged to the driwing gears (12) and (13) positioned on the countershaft (H).
  • the circular channel (10) of the switching frontal gear clutch (2) is situated the long arm (15) of the Usha ⁇ ed strap (16) mounted on the axle (1 7) parallel to the spindle (1), fixed in the body (8).
  • the inside sur- lace (18) of the U-shaped strap (16) is in contact with the cylindrical surface (19) or with the cammed surface (20) of the reducer stem (2) of the switching Dutton (22) mounted in the body (8).
  • the inside surface (18) of the U-shaped strap (16) is permanently compressed by the spring pin (23)mounted into the blind hole (24) of the stem (21) of the switching button (22).
  • the hole (24) is situated perpendicular:/ to the cylindrical surface (19) of the stem (21) and opposite to its cammed surface (20).
  • the switching button (22) is limited in two extreme rotational positions, which enables a continuous contact of the spring pin (23) with the U-shaped strap (16) by means the tooth (25), which is freely sliding in the semi-circular channel (26) shaped in the reducer body (3).
  • the device according to the invention is operating as follows:
  • the engagement of the stem (21) cylindrical surface (19) of the switching button (22) to the snort arm (27) corresponds to a disengaged (switched off) speed, when the switching frontal gear clutch (2) is disengaged from the driven gear (4).
  • the spring pin (231 neutraly compresses the inside surface (13) of the Usnaped strap (16).
  • the separated driven gears (4) and (5) cy the one-side slotted spacer bush O) are freely counted on the wording spindle (1) and are driven by the driving gears (12) and (13) of the countershaft (14). If the switching button (22) is further rotated, the spring pin (23) comes into contact with the short arm (27).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drilling And Boring (AREA)
  • Structure Of Transmissions (AREA)

Abstract

The device is designed for switching the revolutions of electrical, two-speed, percussion and reversible drilling machines. A high switching reliability in idle as well as in motion time is achieved. The device is possessing a simplified construction with reduced overall dimensions. The device comprises a U-shaped strap (16) bearing-mounted on the axle (17), connected through its long arm (15) to the circular channel (10) of the frontal gear clutch (2), slot-sticked on the spindle (1) over which spindle are bearing-mounted the gears (4) and (5) spaced by the longitudinally slotted bush (9) and with the switching button (22) fitted to the body (8). The switching button is provided with a spring pin (23) mounted in the blind hole (24) disposed perpendicularly to the cylindrical surface (19) opposite to the cammed surface (20). By rotation of the switching button (22), both the cammed and the cylindrical surfaces and the spring pin (23) in the inside surface (18) of the U-shaped strap realize the displacement of the strap and respectively of the clutch towards the driven gears (4) and (5).

Description

A DEVICE FOR SWITCHING THE REVOLUTIONS OF ELECTRICAL, TWO-SPEED, PERCUSSION AND REVERSIBLE HAND
DRILLING MACHINE The present invention relates to a device for switching the revolutions of electrical, two-speed, percussion and reversible hand drilling machine wherein the switching is accomplished in idle, or in motion time and the device is finding application in the manufacture of hand electrical tools.
A device for switching the revolutions is known, comprising a switching clutch, mounted on slots over a worlking spindle, over which spindle on both sides of the clutch are freely mounted driven gears. The driven gears are permanently engaged to the driving gears on a countershaft. The freely mounted driven gears are axialy fixed by the reducer body and the remote pins passing freely through the apertures of the switching clutch body. The switching clutch represents a cylindrical body with a circular channel and a central slot aperture, into which from both sides are mounted spring pins movable parallely to the central slot aperture. The pins are able to .enter into the respective apertures of the driven gears mounted on the working spindle. The displacement of the clutch is realized through the U-shaped strap, mounted in an axle parallel to the spindle, whereas one of its arms is located in the circular channel of the clutch. For displacing the strap along the axle is provided a pin immovably and eccentricaly fixed in the front part of the switching button stem, mounted into the aperture of the reducer body. The pin is located in a channel shaped in the flat part of the U-strap, contacting frontaly the switching button. The switching button possesses a rotational capability of 130° and is provided with an element fixing two extreme positions.
The disadvantage of the known device is the low switching reliability owing to the separate control of the mutualy coupled elements mostly located in the ro tating clutch. All this is involving in the large overall dimensions of the clutch, the great number of details and parts as well as clearances harmful for the switching process.
The task of the present invention is the realization of a device for switching the revolutions of electrical, two-speed, percussion and reversible hand drilling machine possessing high reliability and security of the switching in idle as well as in motion time, with a simplified and technologicaly appropriated construction.
According to the invention this task is achieved with a device comprising a switching frontal gear clutch mounted between two driven gears freely set on the wording spindle and permanently engaged to the driving gears axialy fixed to the body and in between separated through a one-side slotted spacer bush. In the clutch body is provided a circular channel into which is located the arm of an U-shaped strap monted to the axle fixed to the body and parallel to the working spindle. The U-shaped strap is connected by means of a pin to the switching button mounted to the body, possessing an element fixing by rotation two extreme positions. The pin is mounted to the stem of the button, which geometrical axle is perpendicular to the axle iixed to the body. According to the invention the pin is perpendiculary orientated to the geometrical axle of the button and is spring-fitted into a blind hole one-side bored in the stem, to which opposite to the pin is shaped a cammed surface. The pin is in contact with the internal surface of the U-shaped strap bended around the button stem.
The advantages o: the device according to the invention are as follows: a switching security is provided in idle as well as in motion time; the narmfull effect oi tr.e clearances during the switching process is avoided; the construction is simplified and the overall demensions of the elements o: the device are reduced. All these effects are achieved through the concentration of the control of the switching clutch outside of the rotating parts, which enables a strengthening of the switching power and the maintenance of a constant stress level between the joints of the different elements.
An examplary embodiment of the device according to the invention is shown on the enclosed figures as follows:
Fig. 1. General view of the drilling machine with a partial section, showing the disposition of the rotor, the countershaft (the secondary shaft) and the spindle.
Fig. 2. General view of the reducer with a partial section showing the disposition of the gears, the spindle, the clutch, the spacer bush, the U-shaped strap and the switching button.
Fig. 3. Section A-A, showing the form and the disposition of the U-shaped strap, the spring pin and the switching button.
Fig. 4. Diagram of the dispositionof the details while swi tching on first speed .
Fig. 5. Diagram of the disposition of the details while switching on second speed.
The device for switching the revolutions of electrical two-speed, percussion and reversible hand drilling machine according to the invention consists of the following elements: switching frontal gear clutch (2} with tooths (3) mounted on slots over the working spindle (1) located between the driven gears (4) and (5) freely mounted on the spindle (1) with frontal channels (6) and (7), which driven gears are axialy fixed to the body (8) spaced by the one-side slotted spacer bush (9). The clutch (2) is provided by a circular channel (cannelure) (10) so as to upon the outside surfaces (11) is mounted the one-side slotted spacer bush (9).
The driven gears are permanently engaged to the driwing gears (12) and (13) positioned on the countershaft (H). In the circular channel (10) of the switching frontal gear clutch (2) is situated the long arm (15) of the Ushaυed strap (16) mounted on the axle (1 7) parallel to the spindle (1), fixed in the body (8). The inside sur- lace (18) of the U-shaped strap (16) is in contact with the cylindrical surface (19) or with the cammed surface (20) of the reducer stem (2) of the switching Dutton (22) mounted in the body (8). The inside surface (18) of the U-shaped strap (16) is permanently compressed by the spring pin (23)mounted into the blind hole (24) of the stem (21) of the switching button (22). The hole (24) is situated perpendicular:/ to the cylindrical surface (19) of the stem (21) and opposite to its cammed surface (20). The switching button (22) is limited in two extreme rotational positions, which enables a continuous contact of the spring pin (23) with the U-shaped strap (16) by means the tooth (25), which is freely sliding in the semi-circular channel (26) shaped in the reducer body (3).
The device according to the invention is operating as follows:
When the first gear (speed) is engaged the cammed surface (20) of the switching button (22) stem (21) is pronped up to the short arm (27) of the U-shaped strap (16) while the spring pin (23) is compressed to the long arm (15) of the U-shaped strap (16). The long arm (15) passing through the slot of the one-side slotted spacer bush (9) and compressed by the spring pin (23) keeps the frontal gear clutch (2) permanently engaged to the driven gear (4) through the tooths (3), the channel (6) into the driven gear (4). The disengagement is acconalished through the rotation of the switching button (22) counter-clockwise and as a result of which the cammed surface (20) is disengaged from the short arm (27). The engagement of the stem (21) cylindrical surface (19) of the switching button (22) to the snort arm (27) corresponds to a disengaged (switched off) speed, when the switching frontal gear clutch (2) is disengaged from the driven gear (4). At the same moment the spring pin (231 neutraly compresses the inside surface (13) of the Usnaped strap (16). The separated driven gears (4) and (5) cy the one-side slotted spacer bush O) are freely counted on the wording spindle (1) and are driven by the driving gears (12) and (13) of the countershaft (14). If the switching button (22) is further rotated, the spring pin (23) comes into contact with the short arm (27). As a result of the pressure of the spring pin (23), the U-shaped strap (16) is displaced along the axle (17) while with its long arm (15) moves the switching frontal gear clutch (2) to the stop in the front of the driven gear (5). The tooths (3) are frontaly pressed to the driven gear (5), owing to the pressure of the spring pin (23) until the coincidence with the frontal channel (7) of the rotating driven gear (5) and until the adherence of the long arm (15) to the cammed surface (20). At this moment we have the switching in second speed.

Claims

C L A I M S :
1. A device for switching the revolutions of the electrical two-speed, percussion and reversible hand drilling machine comprising a switching clutch mounted between two driven gears freely mounted on the working spindle and permanently engaged to the driving gears, the said gears axialy fixed to the body and separated in between , whereas to the body of the clutch is provided a circular channel into which is disposed the arm of an. U-shaped strap, the said strap mounted on an axle fixed to the body and parallel to the working spindle, which U-shaped strap is connected by means of a pin to the switching button mounted to the body, the said button is provided with an element fixing two extreme positions, and the said pin is mounted to the stem of the button whose geometrical axle is perpendicular to the axle fixed to the body, wherein
the pin (23) is perpendiculary orientated to the geometrical axle of the button (25) and is spring-mounted ir to an one-side drilled blind hole (24) in the stem, to which stem opposite to the pin (231 is shaped a cammed surface, whereas the said pin (23) is in contact with the inside surface (18) of the U-shaped strap (16) bended around the stem of the button.
PCT/BG1993/000003 1992-02-11 1993-01-14 A device for switching the revolutions of electrical, two-speed, percussion and reversible hand drilling machine WO1993015863A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BG9588792A BG51906A1 (en) 1992-02-11 1992-02-11 Device for commutation the revolutions of a hand electrical two-speed drilling machine
BG95887 1992-02-11

Publications (1)

Publication Number Publication Date
WO1993015863A1 true WO1993015863A1 (en) 1993-08-19

Family

ID=3924256

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/BG1993/000003 WO1993015863A1 (en) 1992-02-11 1993-01-14 A device for switching the revolutions of electrical, two-speed, percussion and reversible hand drilling machine

Country Status (3)

Country Link
AU (1) AU3487693A (en)
BG (1) BG51906A1 (en)
WO (1) WO1993015863A1 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0836902A1 (en) * 1996-10-11 1998-04-22 Black & Decker Inc. Mode change switch
DE19654832A1 (en) * 1996-12-23 1998-06-25 Black & Decker Inc N D Ges D S Operating element for fitting into powered tool
DE10007665A1 (en) * 2000-02-19 2001-09-06 Scintilla Ag Machine tool
EP1506846A1 (en) * 2003-08-13 2005-02-16 Atlas Copco Electric Tools GmbH Portable power tool
EP1632314A3 (en) * 2004-09-03 2006-04-05 Robert Bosch Gmbh Switching device with a synchronisation spring
EP1832393A3 (en) * 2006-03-09 2009-05-06 Makita Corporation Power tool
WO2011020644A1 (en) * 2009-08-18 2011-02-24 Robert Bosch Gmbh Portable machine tool switching unit
US11261964B2 (en) * 2018-05-17 2022-03-01 Black & Decker Inc. Compliant shifting mechanism and multi-speed power tool having same

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113458453B (en) * 2021-07-29 2022-04-22 永康市晓诚电器有限公司 Efficient electric drill

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2511469A1 (en) * 1975-03-15 1976-09-30 Bosch Gmbh Robert Hand operated two speed power drill - has two part change over with opposing springs and two gears on common shaft
DE3041009A1 (en) * 1980-10-31 1982-05-19 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Fixing for power drill grooved rotary spindle - has locking member in one piece and spring material with forked portion
DE3618024A1 (en) * 1986-05-28 1987-12-03 Hilti Ag Electric tool with clutch

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2511469A1 (en) * 1975-03-15 1976-09-30 Bosch Gmbh Robert Hand operated two speed power drill - has two part change over with opposing springs and two gears on common shaft
DE3041009A1 (en) * 1980-10-31 1982-05-19 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Fixing for power drill grooved rotary spindle - has locking member in one piece and spring material with forked portion
DE3618024A1 (en) * 1986-05-28 1987-12-03 Hilti Ag Electric tool with clutch

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0836902A1 (en) * 1996-10-11 1998-04-22 Black & Decker Inc. Mode change switch
US5992257A (en) * 1996-10-11 1999-11-30 Black & Decker Inc. Power tool with mode change switch
DE19654832A1 (en) * 1996-12-23 1998-06-25 Black & Decker Inc N D Ges D S Operating element for fitting into powered tool
DE10007665A1 (en) * 2000-02-19 2001-09-06 Scintilla Ag Machine tool
EP1506846A1 (en) * 2003-08-13 2005-02-16 Atlas Copco Electric Tools GmbH Portable power tool
EP1632314A3 (en) * 2004-09-03 2006-04-05 Robert Bosch Gmbh Switching device with a synchronisation spring
EP1832393A3 (en) * 2006-03-09 2009-05-06 Makita Corporation Power tool
US7549484B2 (en) * 2006-03-09 2009-06-23 Makita Corporation Power tool
WO2011020644A1 (en) * 2009-08-18 2011-02-24 Robert Bosch Gmbh Portable machine tool switching unit
CN102481688A (en) * 2009-08-18 2012-05-30 罗伯特·博世有限公司 Portable machine tool switching unit
RU2550462C2 (en) * 2009-08-18 2015-05-10 Роберт Бош Гмбх Manual machine switch
US9643309B2 (en) 2009-08-18 2017-05-09 Robert Bosch Gmbh Portable machine tool switching unit
US11261964B2 (en) * 2018-05-17 2022-03-01 Black & Decker Inc. Compliant shifting mechanism and multi-speed power tool having same

Also Published As

Publication number Publication date
AU3487693A (en) 1993-09-03
BG51906A1 (en) 1993-11-15

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