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US3828865A - Hammer drill - Google Patents

Hammer drill Download PDF

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Publication number
US3828865A
US3828865A US00064889A US6488970A US3828865A US 3828865 A US3828865 A US 3828865A US 00064889 A US00064889 A US 00064889A US 6488970 A US6488970 A US 6488970A US 3828865 A US3828865 A US 3828865A
Authority
US
United States
Prior art keywords
shaft
housing
gears
gear
tool
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.)
Expired - Lifetime
Application number
US00064889A
Other languages
English (en)
Inventor
A Schnizler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Metabowerke GmbH and Co
Original Assignee
Metabowerke GmbH and Co
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 Metabowerke GmbH and Co filed Critical Metabowerke GmbH and Co
Application granted granted Critical
Publication of US3828865A publication Critical patent/US3828865A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D16/00—Portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B25D16/006—Mode changers; Mechanisms connected thereto
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2211/00—Details of portable percussive tools with electromotor or other motor drive
    • B25D2211/003—Crossed drill and motor spindles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/195—Regulation means
    • B25D2250/201—Regulation means for speed, e.g. drilling or percussion speed

Definitions

  • the present invention relates to a percussion or hammer drill which is operated by a motor driven gear unit which comprises first gear elements for effecting the rotary movement of the drilling tool and second gear elements for reciprocating a striker in the axial direction of the tool so as to exert impacts upon the drilling tool.
  • the known machines of this type have the disadvantage that, when operating such a machine with a drilling tool of a large diameter, the reduction in speed of the motor caused by the greater load also results in a considerable reduction of the frequency of the impacts of the striker upon the tool and also of the speed of rotation of the tool. Although when using a tool of a larger diameter a lower speed of rotation of this tool is usually desirable, the simultaneous reduction of the frequency of the impacts of the striker upon the tool reduces the drilling efficiency and the output of the machine. These known machines also do not permit the speed of rotationofthe drilling tool to be adjusted in accordance with different kinds and degrees of hardness of the materials to be worked upon.
  • the present invention provides that the ratio between the speed of rotation of the drilling tool and the frequency of the impacts of the striker upon this tool is adjustable, preferably by control means which may be operated on the outside of the machine. Since it is desirable that the frequency of the impacts upon the tool remains constant, the invention provides a percussion or hammer drill which comprises a gear which is driven by a pinion on a motor shaft and carries a crankpin for reciprocating a cylinder containing a piston which carries the striker.
  • the frequency of this striker upon the drilling tool remains constant and the machine is provided with a change-speed gear which is driven by a first shaft carrying the gear with'the crankpin and is adjustable by simple control means at the outside of the machine so as to permit the drilling tool to be rotated at different speeds.
  • the first shaft is for this purpose provided with at least three gears and a second shaft with a pinion and at least two additional gears of different diameters adjacent to each other and meshing with two of the gears on the first shaft.
  • the second shaft is made of a tubular shape and contains a control rod and a compression spring which acts upon the control rod in its axial direction so that its end which projects from the second shaft presses against an adjustable cam.
  • the control rod is provided with a pin which extends transversely to its axis and projects through and is slidable along elongated slots in the wall of the second shaft.
  • this pin engage into diametrically opposite recesses in the walls of the central bores of the two gears on this second shaft, and depending upon the adjustment of the control means and of the control pin within the tubular second shaft, this pin connects either one or the other gear to this shaft so as to drive the same at one speed or another.
  • the machine may be made of a flat shape by providing this cover at one side above the cylinder with an extension containing an aperture for receiving the bearing of the crankpin.
  • this cylinder is located concentrically within and slidable along the inner wall of a guide tube.
  • This guide tube carries on its upper end a rim of bevel teeth which are in engagement with the bevel pinion on the second shaft, while the other end of this guide tube carries a tool holder which is adapted to receive a drilling tool.
  • the guide tube is rotatably mounted in needle or roller bearings.
  • the machine comprises a drive pinion l on the shaft of an electric motor (not shown) which meshes with a gear 3 which is secured at one side to a first shaft 2 and carries on its other side a crankpin 4.
  • a cover 5 which closes the upper end of a cylinder 6 is provided at one side with an upwardly projecting side wall 7 which has an oblong recess 8 in which the needle bearing 45 for the crankpin 4 is slidably mounted.
  • Cylinder 6 the wall of which is provided with an aperture 10 contains a striker piston 9 which is adapted to reciprocate in its axial direction within this cylinder and carries a striker 11 which projects through and is guided by the downwardly projecting neck-shaped bottom 12 of cylinder 6.
  • the lower end of guide sleeve 13 is closed by tool holder 17 which is mounted within a ball bearing 19 in the housing 16 and is adapted to receive a drilling tool 18.
  • the first shaft 2 which is rotatably mounted in a pair of needle bearings 20 and 21 in the housing 16 carries near the center of its length two gears 22 and 23 of different diameters or a larger number of different gears if the gear unit is designed for more than two speeds.
  • These gears 22 and 23 which are rigidly secured to the shaft 2 mesh with the gears 25 and 26 which are rotatably mounted on a second shaft 24 which has a tubular shape.
  • a control rod 27 is axially slidable which is pressed by a compression spring 28 against a cup-shaped cam member 29 the peripheral wall of which varies in height.
  • This cam member 29 is secured to or integral with a short shaft 31 which is rotatably mounted in a cover 30 and carries on its end a control knob 32 which is provided with a locking device consisting of a ball 34 which is acted upon by a compression spring 33 and is adapted to engage into one or another of a plurality of shallow recesses 35 in the cover 30. Transversely to its axis 36, the
  • control rod 27 carries a pin 37 the opposite ends of which project through diametrically opposite longitudinal slots 38 in the wall of the tubular shaft 24 and are adapted to engage into grooves 39 in one or the other gear 25 and 26.
  • the sides of gears 25 and 26 facing each other are each provided with an annular recess 40 or 41 so that, when pin 37 is located centrally between the two gears, these gears may rotate freely without taking along the second shaft 24 which is rotatably mounted near its opposite ends within needle bearings 42 and 43 in parts of the housing 16.
  • the closed end of the second shaft 24 forms a bevel pinion 44 which meshes with the bevel gear teeth 14 on the upper end of guide sleeve 13.
  • the drive pinion 1 on the shaft of the motor drives the gear 3 whereby the crankpin 4 which projects from this gear and is mounted in the needle bearing 45 in the cover of cylinder 6 reciprocates the latter together with the striker 9 in the direction of the axis 46.
  • the needle bearing 45 is for this purpose slidably mounted in an oblong recess 8 of cover 5 so as to be able to oscillate vertically to the axis 46 and to the plane of the drawing.
  • piston 9then reciprocates in the direction of the axis 46 and its striker 11 thereby hits against the upper end of the tool 18 if the latter projects sufficiently into an axial bore 49 in the tool holder 17.
  • the gears 25 and 26 are driven at different speeds in accordance with their different diameters.
  • the second shaft 24 will be driven either at a higher or lower speed. If pin 37 is located in its central position and thus in the adjacent annular recesses 40 and 41 in gears 25 and 26, the second shaft 24 will not be driven. Pin 37 may be adjusted from the outside to the desired positions by turning the control knob 32 and the cam member 29 thereon. Tool 18 will then be rotated at one speed or the other by the bevel pinion 44 on shaft 24, the rim of bevel teeth 14 on guide sleeve 13, and the tool holder 17.
  • the advantages which are attained by the present invention are due particularly to the fact that the speed of rotation of the drilling tool may be adjusted so as to be the most suitable depending upon the type and degree of hardness of the material to be worked upon and upon the diameter of the tool.
  • the machine according to the invention has the further advantage that it is of a very'simple and sturdy construction and capable of withstanding rough treatment.
  • a hammer drill comprising a housing; tool holding means rotatably mounted at least partly in said housing for holding a drilling tool; striking means mounted in said housing for reciprocating movement in the direction of the axis of said tool and adapted to intermittently exert impacts at least indirectly upon said tool so as to move the same in axial direction relative to said housing; a gear unit in said housing; means for driving said gear unit and comprising a driven shaft and a drive pinion secured to said driven shaft, said gear unit comprising first gear means comprising a first shaft rotatably mounted in said housing, a gear secured to said first shaft and engaging with said drive pinion and having a crank pin on one side thereof connected to said striking means for reciprocating the same in said axial direction, said gear unit further comprising second gear means comprising a plurality of gears of different size secured to said first shaft, a second shaft rotatably mounted in said housing, a plurality of gears on said second shaft, normally freely rotatable thereon and respectively meshing with associated gears on said first shaft,
  • said striking means comprise a cylinder, an air-cushioned piston within said cylinder having a striker rod secured to said piston and projecting from said cylinder, guide means for guiding said cylinder so as to be movable in said axial direction, and bearing means on said cylinder for receiving said crankpin and for operatively connecting the same to said cylinder.
  • each of said gears on said second shaft has a central bore through which said second shaft extends so as normally to be freely rotatable therein, the wall of said second shaft having diametrically opposite longitudinal slots therein and the wall of each of said bores having diametrically opposite grooves therein, said second shaft being at least partly tubular
  • said control means comprising a control rod axially slidable within said second shaft, a pin extending transversely through said control rod and having ends projecting therefrom through said longitudinal slots in the wall of said shaft into said grooves of a first of said gears on said second shaft so as to lock said first gear to said second shaft to drive the same while the adjacent gear on said second shaft continues to be freely rotatable on said second shaft, a compression spring within said second shaft acting upon one end of said control rod and tending to shift said rod within said second shaft so that said pin slides out of said grooves of said first gear and into said grooves of the adjacent gear so that said second shaft will then be driven by
  • said manually movable means comprise a curved cam member within said housing engaging upon said other end of said control rod, and a control knob on the outside of said housing and connected to said cam member for moving the same.
  • a hammer drill comprising a housing; tool holding means rotatably mounted in said housing for holding a drilling tool; striking means mounted in said housing reciprocatable in the direction of the axis of said tool and adapted to intermittently exert impacts at least indirectly upon said tool so as to move the same in said axial direction relative to said housing; a motiontransmitting unit in said housing; means for driving said motion-transmitting unit, said motion-transmitting unit comprising first motion-transmitting means for reciprocating said striking means in said direction and second motion-transmitting means for rotating said tool holding means about said axis and comprising a coupling shaft in permanent driving engagement with said tool holding means, first and second gears permanently coupled with said drive means, and coupling means shiftable between a first end position connecting one of said gears to said coupling shaft for driving the latter at a first speed and a second end position connecting the other of said gears to said coupling shaft for driving the latter at a second speed; and control means cooperating with said coupling means for shifting the same between said positions thereof so
  • a hammer drill comprising a housing; tool holding means rotatably mounted in said housing for holding a drilling tool; striking means mounted in said housing for reciprocating movement in the direction of the axis of said tool and adapted to intermittently exert impacts at least indirectly on said tool; gear means in said housing for rotating said tool holding means at variable speeds, said gear means including a first shaft rotatably mounted in said housing; a driven shaft rotatably mounted in said housing; a pinion fixed to said driven shaft; a gear fixed to said first shaft and meshing with said pinion; and a crank pin on said gear and connected to said striking means for reciprocating the same in said axial direction.
  • gear means further comprises at least two additional gears of different diameters mounted on said first shaft for rotation therewith, a second shaft rotatably mounted in said housing, at least two further gears normally freely rotatable on said second shaft and respectively meshing with said gears on said first shaft, and operator controlled coupling means for selectively coupling any of said further gears to said second shaft for rotation therewith; and including a drive connection between said second shaft and said tool holding means.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Drilling And Boring (AREA)
US00064889A 1969-07-30 1970-07-29 Hammer drill Expired - Lifetime US3828865A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1938660A DE1938660C3 (de) 1969-07-30 1969-07-30 Schlagbohrhammer

Publications (1)

Publication Number Publication Date
US3828865A true US3828865A (en) 1974-08-13

Family

ID=5741332

Family Applications (1)

Application Number Title Priority Date Filing Date
US00064889A Expired - Lifetime US3828865A (en) 1969-07-30 1970-07-29 Hammer drill

Country Status (2)

Country Link
US (1) US3828865A (de)
DE (1) DE1938660C3 (de)

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4066136A (en) * 1975-04-15 1978-01-03 Robert Bosch G.M.B.H. Torque and impulse transmitting machine
US4114699A (en) * 1976-01-22 1978-09-19 Licentia Patent-Verwaltungs-Gmbh Pneumatic rotary hammer device
US4497380A (en) * 1981-06-17 1985-02-05 Black & Decker Inc. Hand-held power tools including bearing supports for components undergoing linear movement
US4550788A (en) * 1983-11-08 1985-11-05 The Board Of Trustees Of The University Of Alabama Roof bolt hole groover
US4669551A (en) * 1983-03-21 1987-06-02 Hilti Aktiengesellschaft Electropneumatic hammer drill
US4998588A (en) * 1988-12-09 1991-03-12 Hilti Aktiengesellschaft Hand tool with a shifting gear unit
US5125461A (en) * 1990-04-27 1992-06-30 Black & Decker, Inc. Power tool
EP1170096A1 (de) * 2000-07-07 2002-01-09 HILTI Aktiengesellschaft Kombiniertes Elektrohandwerkzeuggerät
FR2821782A1 (fr) * 2001-03-12 2002-09-13 Hilti Ag Mecanisme de commutation pour un appareil portatif combine
FR2822742A1 (fr) * 2001-03-27 2002-10-04 Hilti Ag Appareil portatif avec mecanisme de commutation
US6478095B2 (en) * 2000-06-16 2002-11-12 Hilti Aktiengesellschaft Hand-held power tool
DE10142569A1 (de) * 2001-08-30 2003-03-27 Bosch Gmbh Robert Handwerkzeugmaschine
US20040182589A1 (en) * 2002-12-19 2004-09-23 Holger Cecchin Percussion electrical hand held tool
US20040262043A1 (en) * 2003-04-25 2004-12-30 Stuart Schuaf Systems and methods for the drilling and completion of boreholes using a continuously variable transmission to control one or more system components
US20050072584A1 (en) * 2003-10-07 2005-04-07 Friedmar Dresig Hand power tool with a percussion mechanism, and as a method of operating the hand power tool
US20060137889A1 (en) * 2004-12-23 2006-06-29 Andreas Hanke Hammer mechanism for power tool
US20060159577A1 (en) * 2004-12-23 2006-07-20 Martin Soika Drive mechanism for a power tool
US20070125563A1 (en) * 2005-12-02 2007-06-07 Makita Corporation Power tool
US20090070976A1 (en) * 2007-09-17 2009-03-19 Amirault Michael L Non-Pneumatic Scaler
US20100084151A1 (en) * 2006-12-14 2010-04-08 Axel Kuhnle Electrical device with locked-on rotatable operating element
US20140374131A1 (en) * 2011-06-02 2014-12-25 Makita Corporation Power tools

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2916508C2 (de) * 1979-04-24 1987-03-12 Friedrich Duss Maschinenfabrik GmbH & Co, 7265 Neubulach Von Hand führbarer, elektro-pneumatischer Bohrhammer
EP0042010B1 (de) * 1980-06-12 1984-08-08 Black & Decker Inc. Motorisch getriebenes Werkzeug mit einer Vorrichtung zur Umwandlung einer Drehbewegung in eine hin- und hergehende Bewegung
DE3039669A1 (de) * 1980-10-21 1982-05-27 Robert Bosch Gmbh, 7000 Stuttgart Bohrhammer
DE19734140A1 (de) * 1997-08-07 1999-02-11 Hawera Probst Gmbh Bohrwerkzeug

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4066136A (en) * 1975-04-15 1978-01-03 Robert Bosch G.M.B.H. Torque and impulse transmitting machine
US4114699A (en) * 1976-01-22 1978-09-19 Licentia Patent-Verwaltungs-Gmbh Pneumatic rotary hammer device
US4497380A (en) * 1981-06-17 1985-02-05 Black & Decker Inc. Hand-held power tools including bearing supports for components undergoing linear movement
US4669551A (en) * 1983-03-21 1987-06-02 Hilti Aktiengesellschaft Electropneumatic hammer drill
US4550788A (en) * 1983-11-08 1985-11-05 The Board Of Trustees Of The University Of Alabama Roof bolt hole groover
US4998588A (en) * 1988-12-09 1991-03-12 Hilti Aktiengesellschaft Hand tool with a shifting gear unit
US5125461A (en) * 1990-04-27 1992-06-30 Black & Decker, Inc. Power tool
US5159986A (en) * 1990-04-27 1992-11-03 Black & Decker, Inc. Power tool
US6478095B2 (en) * 2000-06-16 2002-11-12 Hilti Aktiengesellschaft Hand-held power tool
KR100735592B1 (ko) * 2000-06-16 2007-07-04 힐티 악티엔게젤샤프트 손 공구 장치
EP1170096A1 (de) * 2000-07-07 2002-01-09 HILTI Aktiengesellschaft Kombiniertes Elektrohandwerkzeuggerät
FR2821782A1 (fr) * 2001-03-12 2002-09-13 Hilti Ag Mecanisme de commutation pour un appareil portatif combine
US6712156B2 (en) 2001-03-12 2004-03-30 Hilti Aktiengesellschaft Switch assembly for a combined hand tool device
FR2822742A1 (fr) * 2001-03-27 2002-10-04 Hilti Ag Appareil portatif avec mecanisme de commutation
DE10142569A1 (de) * 2001-08-30 2003-03-27 Bosch Gmbh Robert Handwerkzeugmaschine
US20040182589A1 (en) * 2002-12-19 2004-09-23 Holger Cecchin Percussion electrical hand held tool
US7048076B2 (en) * 2002-12-19 2006-05-23 Hilti Aktiengesellschaft Percussion electrical hand held tool
US20040262043A1 (en) * 2003-04-25 2004-12-30 Stuart Schuaf Systems and methods for the drilling and completion of boreholes using a continuously variable transmission to control one or more system components
US20050000733A1 (en) * 2003-04-25 2005-01-06 Stuart Schaaf Systems and methods for performing mud pulse telemetry using a continuously variable transmission
US7481281B2 (en) * 2003-04-25 2009-01-27 Intersyn Ip Holdings, Llc Systems and methods for the drilling and completion of boreholes using a continuously variable transmission to control one or more system components
US20050072584A1 (en) * 2003-10-07 2005-04-07 Friedmar Dresig Hand power tool with a percussion mechanism, and as a method of operating the hand power tool
US7708083B2 (en) * 2003-10-07 2010-05-04 Robert Bosch Gmbh Hand power tool with a percussion merchanism, and as a method of operating the hand power tool
US20060137889A1 (en) * 2004-12-23 2006-06-29 Andreas Hanke Hammer mechanism for power tool
US20060159577A1 (en) * 2004-12-23 2006-07-20 Martin Soika Drive mechanism for a power tool
US8122972B2 (en) 2004-12-23 2012-02-28 Black & Decker Inc. Drive mechanism for a power tool
US7469752B2 (en) * 2005-12-02 2008-12-30 Makita Corporation Power tool
US20070125563A1 (en) * 2005-12-02 2007-06-07 Makita Corporation Power tool
US20100084151A1 (en) * 2006-12-14 2010-04-08 Axel Kuhnle Electrical device with locked-on rotatable operating element
US20090070976A1 (en) * 2007-09-17 2009-03-19 Amirault Michael L Non-Pneumatic Scaler
US20140374131A1 (en) * 2011-06-02 2014-12-25 Makita Corporation Power tools
US9469023B2 (en) * 2011-06-02 2016-10-18 Makita Corporation Power tools

Also Published As

Publication number Publication date
DE1938660C3 (de) 1975-05-15
DE1938660B2 (de) 1974-10-03
DE1938660A1 (de) 1971-02-11

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