EP1897666A1 - Handhobel - Google Patents

Handhobel Download PDF

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Publication number
EP1897666A1
EP1897666A1 EP07017591A EP07017591A EP1897666A1 EP 1897666 A1 EP1897666 A1 EP 1897666A1 EP 07017591 A EP07017591 A EP 07017591A EP 07017591 A EP07017591 A EP 07017591A EP 1897666 A1 EP1897666 A1 EP 1897666A1
Authority
EP
European Patent Office
Prior art keywords
planer
cam
front base
amount
protrusion
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
Application number
EP07017591A
Other languages
English (en)
French (fr)
Other versions
EP1897666B1 (de
Inventor
Koji Matsubara
Takaaki Kato
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.)
Makita Corp
Original Assignee
Makita Corp
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 Makita Corp filed Critical Makita Corp
Publication of EP1897666A1 publication Critical patent/EP1897666A1/de
Application granted granted Critical
Publication of EP1897666B1 publication Critical patent/EP1897666B1/de
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27C—PLANING, DRILLING, MILLING, TURNING OR UNIVERSAL MACHINES FOR WOOD OR SIMILAR MATERIAL
    • B27C1/00—Machines for producing flat surfaces, e.g. by rotary cutters; Equipment therefor
    • B27C1/10—Hand planes equipped with power-driven cutter blocks

Definitions

  • the present invention relates to a portable planer in which the front base is held in contact with a working surface of a workpiece and slid forward in order to plane a workpiece by a rotating planer blade member, and more particularly, to a technique of adjusting the cutting depth of the planer blade member with respect to the working surface of the workpiece.
  • a known electric portable planer is provided with a planer blade member that is rotated by a motor.
  • the cutting depth (namely, planing dept) of the planer blade member with respect to a workpiece is adjusted by changing the vertical position of the front base with respect to the planer body having the planer blade member that rotates and thereby adjusting the amount of protrusion of the planer blade member from the underside of the front base.
  • Such a portable planer is disclosed, for example, in Japanese utility model publication No. 38-21492 .
  • the front base is disposed in front of the planer blade member in the planing direction and mounted to the planer body for relative movement such that its longitudinal movement is converted into vertical movement via an inclined surface.
  • the vertical position of the front base is adjusted via a cutting depth adjusting mechanism.
  • the cutting depth adjusting mechanism includes a cutting depth adjusting knob that is disposed on the planer body and can be turned by a user, an eccentric cam (eccentric shaft) that rotates together with the knob, and a guide member that is fixedly mounted on the front base and engages the eccentric cam.
  • the front base is moved in the vertical direction by turning the knob.
  • a portable planer of another type is also known which is provided with a cutting depth adjusting mechanism of the type which adjusts the height position of the front base by using a screw, for example, as disclosed in Japanese laid-open patent publication No. 62-273 804 .
  • the above-described known cutting depth adjusting mechanism using an eccentric cam is advantageous over the screw-type one in that the number of turning operations of the knob can be reduced compared with the screw-type one.
  • the front base is moved in the vertical direction by utilizing longitudinal displacement in the circular arc motion of the eccentric cam rotating around the axis of rotation of the knob. Therefore, the vertical displacement of the front base per unit angle of rotation of the knob cannot be constant. Specifically, the amount of displacement of the front base per unit angle of rotation of the knob changes in a sine curve, and is thus reduced in the vicinity of the raised end and the lowered end of the front base. Therefore, the height position of the front base is not easily adjusted. In this point, a further improvement is required.
  • a representative portable planer is provided with a planer body, a planer blade member that is disposed in the planer body and rotates around a longitudinal axis of the planer blade member, and a front base connected to the planer body for vertical movement with respect to the planer body.
  • a planer blade is attached to the planer blade member.
  • the front base is held in contact with a working surface of a workpiece and slid forward in order to plane the workpiece by the planer blade which protrudes from the underside of the front base.
  • the manner of "connecting the front base to the planer body for vertical movement with respect to the planer body” suitably includes both the manner of connecting the front base such that the front base can move obliquely in the vertical direction with respect to the planer body, and the manner of connecting the front base such that it can move linearly in the vertical direction with respect to the planer body.
  • the "vertical” direction here represents the direction in which the height position of the front base with respect to the planer body is changed because the front base is inherently located under the planer body in the portable planer. Therefore, the vertical direction here may be defined by the direction in which the relative positions of the front base and the planer body are changed in a direction that intersects with the planing direction.
  • the portable planer of this invention further includes a cutting depth adjusting mechanism that is operated by a user to change the vertical position of the front base with respect to the planer body and thereby adjusts the amount of protrusion of the planer blade from the underside of the front base.
  • the cutting depth adjusting mechanism includes an operating member that is manually turned, a cam member that rotates together with the operating member, and a height changing section that engages the cam member and changes the height of the front base with respect to the planer body, based on an output of the amount of cam lift.
  • the cam member has a cam curve that keeps constant the amount of cam lift per unit angle of rotation which is outputted by the cam member.
  • the cam member may rotate around the rotation axis extending in any given direction between the vertical direction and the horizontal direction.
  • the amount of cam lift according to the invention may be defined by the amount of displacement of the rotating cam member in a direction that intersects with the axis of rotation of the cam member.
  • the manner of keeping constant the amount of cam lift per unit angle of rotation according to the invention may preferably be defined by a manner of outputting a constant amount of cam lift to the height changing section by input of a constant angle of rotation of the cam member.
  • the cam member having a cam curve that keeps constant the amount of cam lift per unit angle of rotation which is outputted by the cam member, the relationship between the angle of rotation of the cam member and the amount of vertical displacement of the front base can be kept constant, when the height position of the front base is changed with respect to the planer body by turning the operating member in order to adjust the amount of protrusion of the planer blade member from the underside of the front base. Therefore, the amount of protrusion of the planer blade can be easily adjusted, so that ease of operation is enhanced.
  • the cam member to keep constant the amount of cam lift per unit angle of rotation may typically include a plate cam having a heart-shaped contour.
  • a position retaining mechanical part may further be provided which retains the operating member in a turned position after turning operation.
  • the position retaining mechanical part includes a plurality of recesses arranged on a circular arc around an axis of rotation of the operating member, a protrusion that is removably engaged in the recesses, and a biasing member that elastically biases the protrusion in a direction of engagement with the recesses.
  • the protrusion is engaged in any one of the recesses according to the turning operation of the operating member, so that the operating member is retained in the turned position. Because the recesses are equidistantly arranged, the durability can be increased.
  • FIGS. 1 and 2 show a representative entire electric portable planer 101 according to the invention.
  • the portable planer 101 includes front and rear bases 103, 105 which are disposed on the front and the rear in the direction of movement (travel) of the planer along the workpiece during planing operation, a body 107 which is disposed on the front and rear bases 103,105, and a handle 109 which is connected to the upper surface of the body 107 and is held by the user.
  • the direction of travel of the electric planer 101 during planing operation is shown by an arrow.
  • the left side in the drawings is the front side in the direction of travel of the planer.
  • the body 107, the rear base 105 and the handle 109 are the features that correspond to the "planer body" in this invention.
  • the body 107 includes a motor housing 111, a side housing 113 and a cover 115.
  • the motor housing 111 houses a driving motor 121 and a planer blade member 123.
  • the side housing 113 houses a power transmitting mechanism (not shown) that transmits the rotating output of the driving motor 121 to the planer blade member 123.
  • the cover 115 is removably mounted to the side housing 113 to open and close the side opening of the side housing 113.
  • the planer blade member 123 is a feature that corresponds to the "planer blade member" according to the present invention.
  • the driving motor 111 is disposed within the motor housing 111 such that its rotating shaft extends in a horizontal direction that intersects with the direction of travel of the electric planer 101 1 during planing operation
  • the planer blade member 123 includes a generally cylindrical rotary drum 123a which is supported rotatably on an axis parallel to the axis of rotation of the driving motor 121, and a plurality of cutting blades 123b which are mounted on the rotary drum at predetermined intervals in the circumferential direction and extend in the axial direction of the rotary drum 123a.
  • the cutting blade 123b is a feature that corresponds to "planer blade" according to the invention.
  • the planer blade member 123 is disposed between the front base 103 and the rear base 105, and a lower edge of the planer blade member 123 is exposed together with the cutting blade 123b below from an opening between the front base 103 and the rear base 105.
  • the driving motor 121 is driven and the planer blade member 123 is rotated.
  • the user places the front base 103 on the working surface of the workpiece and slides it forward along the workpiece, so that the planing operation of the cutting blades 123b of the planer blade member 123 can be performed.
  • the cutting depth adjusting mechanism 131 is manually operated to adjust the vertical position of the front base 103 with respect to the body 107.
  • the amount of protrusion H of the cutting blade 123b of the planer blade member 123 which protrudes from the underside of the front base 103 can be changed. In this manner, the cutting depth of the planer blade member 123 can be adjusted.
  • the cutting depth adjusting mechanism 131 for adjusting the cutting depth of the planer blade member 123 is now be described.
  • the front base 103 is connected to the body 107 such that it can move vertically along guide surfaces in the form of inclined surfaces 103a, 107a extending obliquely upward toward the front at a predetermined angle ( ⁇ ) with respect to a horizontal line (the underside of the base).
  • the inclined surface 103a is formed on the right and left side surfaces of the front base 103 and slidably contacts the inclined surface 107a formed on the right and left side surfaces of the body 107.
  • the inclined surface 103a of the front base 103 is normally pressed against the inclined surface 107a of the body 107 by the spring force of a plate spring 141 as shown in FIG. 4.
  • the plate spring 141 is mounted to the front base 103 generally at the middle in its extending direction by a screw 143. Further, the both extending ends of the plate spring 141 press spring receiving portions 107b of the body 107 from above by the spring force. Thus, the plate spring 141 normally applies an upward spring force to the front base 103.
  • the front base 103 is moved along the inclined surface 107a of the body 107 while being prevented from moving in the lateral direction via a guide member (not shown).
  • the cutting depth adjusting mechanism 131 includes the operating knob 133 that is operated by the user within a generally horizontal plane, a cam 135 that rotates together with the operating knob 133 within a generally horizontal plane, and an engagement recess 137 that engages the cam 135.
  • the operating knob 133 and the cam 135 are features that correspond to the "operating member” and the "cam member", respectively, according to the present invention.
  • the operating knob 133 is disposed on the outside upper surface of the body 107 and includes a knob shaft 133a extending downward from the underside of the operating knob 133 toward the front base 103 through the inside of the body 107.
  • the knob shaft 133a is rotatably mounted to the body 107, and the cam 135 is integrally formed on the extending end or the lower end of the knob shaft 133a.
  • the knob shaft 133a and the cam 135 may be formed separately and thereafter joined so as to rotate together.
  • the engagement recess 137 is integrally formed in the middle of the upper surface of the planar section of the front base 103 and has an oblong shape elongated in the lateral direction (that intersects with the planing direction) (see FIG. 6).
  • the engagement recess 137 engages with the front end and the rear end of the outer periphery of the cam 135 in surface contact.
  • the front base 103 engages the outer periphery of the cam 135 via the engagement recess 137 and linearly moves in the longitudinal direction by rotation of the cam 135.
  • a longitudinal movement (Y) of the front base 103 is converted into a vertical movement (H) via the above-described inclined surfaces 103a, 107a.
  • the vertical position of the front base 103 with respect to the body 107 is changed, so that the amount of protrusion H (see FIG. 3) or the cutting depth of the cutting blade 123b of the planer blade member 123 is adjusted.
  • the engagement recess 137 and the inclined surfaces 103a, 107a are features that correspond to the "height changing section" according to the present invention.
  • FIG. 5 is a cam diagram of the cam 135 according to the representative embodiment.
  • the horizontal axis indicates an angle of rotation ⁇
  • the vertical axis indicates the amount of cam lift Y.
  • the vertical displacement of the front base 103 is determined by the amount of cam lift Y outputted when the cam 135 rotates.
  • the cam curve is set such that the amount of cam lift y1 per unit angle of rotation ⁇ 1 which is outputted by the cam 135 is kept constant, or such that the vertical displacement y1 of the front base 103 per unit angle of rotation ⁇ 1 of the cam 135 is kept constant.
  • the cam curve of the cam 135 is formed such that the uniform rotation of the cam 135 is converted into uniform linear motion of the front base 103.
  • the cam 135 is contoured such that the front base 103 can be raised by the same displacement y1 for every constant angle of rotation ⁇ 1 during half turn of the cam 153, and such that the front base 103 can be lowered by the same displacement y1 for every constant angle of rotation ⁇ 1 during the remaining half turn of the cam 153.
  • the cam 135 has a generally heart-shaped contour.
  • the cutting depth adjusting mechanism 131 is constructed as described above. Therefore, the front base 103 is moved in the vertical direction via the engagement recess 137 that engages the cam 135 and via the inclined surfaces 103a, 107a when the user turns the operating knob 133 clockwise or counterclockwise to thereby rotate the cam 135. In this manner, the height position of the front base 103 with respect to the body 107 can be determined and the protrusion H of the planer blade member 123 can be adjusted.
  • the amount of cam lift y1 per unit angle of rotation ⁇ 1 of the cam 135 is kept constant. Therefore, the protrusion H of the planer blade member 123 can be more readily adjusted, and ease of operation is improved.
  • a scale 145 for indicating the amount of protrusion H (for example, 0 mm minimum to 4 mm maximum) of the planer blade member 123 is provided, for example, in the range of about 140° around the operating knob 133, on the upper surface of the body 107 on which the operating knob is mounted
  • the scale 145 is calibrated equidistantly, for example, in increments of 0.1 mm
  • a pointer 147 for reading off the scale 145 is provided on a circular flange 133b of the operating knob 133. According to this embodiment, the user can adjust the amount of protrusion H of the planer blade member 123 in tenths of 1 mm.
  • FIG. 6 shows the relationship between the angle of rotation of the heart-shaped cam 135 (shown on the upper side) and the amount of protrusion H of the planer blade member 123 (shown on the lower side).
  • the engagement recess 136 engages the cam 135 in the position rotated, for example, 10° from a line P connecting the maximum diameter portion and the minimum diameter portion of the cam 135.
  • This state is shown in FIG. 6 on the right end.
  • the amount of protrusion H increases in increments of 1 mm each time the cam 135 (the operating knob 133) is turned 35° clockwise (as viewed in the drawing) from the engaged position. This state is shown in FIG. 6 in sequence from right to left.
  • the amount of cam lift y1 per unit angle of rotation ⁇ 1 is set constant, so that the scale 145 can be calibrated equidistantly.
  • the displacement of the front base for every unit angle of rotation of the operating knob varies and as a result, the scale indicating the amount of protrusion of the planer blade member must be calibrated at irregular intervals.
  • the amount of protrusion cannot be easily checked.
  • the representative embodiment of this invention such a problem is eliminated and the amount of protrusion H of the planer blade member 123 can be easily adjusted.
  • the portable planer 101 includes a position retaining mechanical part 151 that retains the operating knob 133 in a turned position after turning operation.
  • the position retaining mechanical part 151 includes a steel ball 153, a plurality of spherical recesses 155 that engage the steel ball 153, and a biasing spring 157 that biases the steel ball 153 in a direction of engagement with the recesses 155.
  • the steel ball 153, the spherical recesses 155 and the biasing spring 157 are features that correspond to the "protrusion", the "recess” and the “biasing member", respectively, according to this invention.
  • the spherical recesses 155 are formed in the underside region of the circular flange 133b of the operating knob 133 which is opposed to the outside upper surface of the body 107.
  • the spherical recesses 155 are arranged on a circular arc around the axis of rotation of the operating knob 133, at intervals corresponding to the intervals of the markings of the scale 145, or at intervals corresponding to 0.1 mm protrusion of the planer blade member 123.
  • the steel ball 153 is received in a cylindrical steel-ball receiver 107c formed on the body 107 and having an open top.
  • the steel ball 153 is elastically urged upward by the biasing spring 157 disposed within the steel-ball receiver 107c, and is pressed against the associated spherical recess 155.
  • the spherical recesses 155 and the steel ball 153 move with respect to each other in the circumferential direction around the axis of rotation of the operating knob 133. Specifically, the steel ball 153 moves with respect to the spherical recesses 155 while climbing over the partitions between the spherical recesses 155 against the biasing force of the biasing spring 157.
  • the steel ball 153 is fitted in one of the spherical recesses 155 located in a position corresponding to the turned position, and retains the operating knob 133 in the turned position.
  • the spherical recesses 155 of the position retaining mechanical part 151 can be equidistantly arranged like the scale 145.
  • the recesses are arranged at irregular intervals. Therefore, according to the known art, it is difficult to secure a sufficient strength for a partition between narrowly-spaced adjacent recesses and the durability decreases.
  • the spherical recesses 155 can be equidistantly arranged, so that the partitions between the adjacent spherical recesses 155 can be formed in uniform thickness and can obtain increased durability.
  • cam 135 is defined by a plate cam according to the embodiment, it may be defined by a grooved cam. It is explicitly stated that all features disclosed in the description and/or the claims are intended to be disclosed separately and independently from each other for the purpose of original disclosure as well as for the purpose of restricting the claimed invention independent of the composition of the features in the embodiments and/or the claims. It is explicitly stated that all value ranges or indications of groups of entities disclose every possible intermediate value or intermediate entity for the purpose of original disclosure as well as for the purpose of restricting the claimed invention, in particular as limits of value ranges. Description of Numerals

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Milling, Drilling, And Turning Of Wood (AREA)
EP20070017591 2006-09-11 2007-09-07 Handhobel Expired - Fee Related EP1897666B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2006245956A JP4959261B2 (ja) 2006-09-11 2006-09-11 手持鉋

Publications (2)

Publication Number Publication Date
EP1897666A1 true EP1897666A1 (de) 2008-03-12
EP1897666B1 EP1897666B1 (de) 2011-12-28

Family

ID=38788326

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20070017591 Expired - Fee Related EP1897666B1 (de) 2006-09-11 2007-09-07 Handhobel

Country Status (3)

Country Link
EP (1) EP1897666B1 (de)
JP (1) JP4959261B2 (de)
RU (1) RU2446043C2 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014212160A1 (de) * 2014-06-25 2015-12-31 Robert Bosch Gmbh Tragbare Werkzeugmaschine

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2774399A (en) * 1955-03-15 1956-12-18 Porter Cable Machine Co Power operated wood plane with chip and shaving discharge means
US3407857A (en) * 1966-12-30 1968-10-29 Rockwell Mfg Co Plane
SU785036A1 (ru) * 1979-03-24 1980-12-07 за витель 785036 (ID Электрорубанок
DE3441943A1 (de) * 1984-11-16 1986-05-28 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Elektrischer handhobel
DE8619361U1 (de) * 1986-07-18 1986-09-25 Mafell Maschinenfabrik Rudolf Mey GmbH & Co KG, 7238 Oberndorf Handhobel
DE3542095A1 (de) * 1985-11-28 1987-06-04 Festo Kg Handhobelmaschine
US5427483A (en) * 1992-02-18 1995-06-27 Robert Bosch Gmbh Electric hand plane with planing depth adjuster
GB2323809A (en) * 1997-04-04 1998-10-07 Bosch Gmbh Robert Motor driven portable planer

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS477998Y1 (de) * 1968-04-09 1972-03-27
JPH0643041B2 (ja) * 1986-05-23 1994-06-08 株式会社芝浦製作所 携帯用電動カンナ
JPH08190430A (ja) * 1995-01-12 1996-07-23 Matsushita Electric Ind Co Ltd 位置決めテーブル
JP2005059118A (ja) * 2003-08-08 2005-03-10 Taiyo Ltd 電動ハンド
RU2248878C1 (ru) * 2003-11-03 2005-03-27 Томский политехнический университет Ручной рубанок

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2774399A (en) * 1955-03-15 1956-12-18 Porter Cable Machine Co Power operated wood plane with chip and shaving discharge means
US3407857A (en) * 1966-12-30 1968-10-29 Rockwell Mfg Co Plane
SU785036A1 (ru) * 1979-03-24 1980-12-07 за витель 785036 (ID Электрорубанок
DE3441943A1 (de) * 1984-11-16 1986-05-28 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Elektrischer handhobel
DE3542095A1 (de) * 1985-11-28 1987-06-04 Festo Kg Handhobelmaschine
DE8619361U1 (de) * 1986-07-18 1986-09-25 Mafell Maschinenfabrik Rudolf Mey GmbH & Co KG, 7238 Oberndorf Handhobel
US5427483A (en) * 1992-02-18 1995-06-27 Robert Bosch Gmbh Electric hand plane with planing depth adjuster
GB2323809A (en) * 1997-04-04 1998-10-07 Bosch Gmbh Robert Motor driven portable planer

Also Published As

Publication number Publication date
JP2008062625A (ja) 2008-03-21
RU2007133829A (ru) 2009-03-20
EP1897666B1 (de) 2011-12-28
JP4959261B2 (ja) 2012-06-20
RU2446043C2 (ru) 2012-03-27

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