EP0048304A2 - Depth of cut adjustment mechanism for a power planer - Google Patents
Depth of cut adjustment mechanism for a power planer Download PDFInfo
- Publication number
- EP0048304A2 EP0048304A2 EP80105747A EP80105747A EP0048304A2 EP 0048304 A2 EP0048304 A2 EP 0048304A2 EP 80105747 A EP80105747 A EP 80105747A EP 80105747 A EP80105747 A EP 80105747A EP 0048304 A2 EP0048304 A2 EP 0048304A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- shoe
- housing
- depth
- cut
- adjustment
- 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
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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
- portable power planers comprise a motor driven rotary cutter head having one or more cutting blade assemblies disposed thereon for performing a planing operation on the surface of a workpiece as the cutter head rotates.
- the bottom surface of the tool consists of a fixed shoe located rearwardly of the cutter head and an adjustable shoe disposed forwardly of the cutter head. As the front shoe is adjusted upwardly or downwardly, the cutting depth of the cutting blade of the planer is adjusted accordingly.
- the adjustable front shoe of a portable power planer typically includes an integral stem or sleeve that is threaded either directly to an adjustment cap disposed atop the front end of the housing or to a threaded shaft or bolt that is in turn fastened at its other end to the adjustment cap for rotation therewith.
- a powerful compression spring is interposed about the sleeve between the shoe and the housing to maintain the elevation of the adjustable shoe in the position set by the operator.
- the compression spring is held in compression between the adjustable shoe and the housing and must be of sufficient strength to resist the natural tendency of the operator to bear down upon the planer when performing a planing operation, and yet be sufficiently compressible to permit convenient upward adjustment of the adjustable front shoe.
- the operator can overcome the thrust force of the compression spring and dislodge the adjustable shoe from its preset position, thereby causing an undesired variation in the depth of cut.
- the elevation adjustment arrangement includes an adjustable shoe having fixedly attached thereto a rod extending upwardly therefrom which is threadedly engaged at its upper end to an elevation positioning nut rotatably mounted in the housing and fixed against elevational movement relative thereto.
- An adjustment cap disposed atop the housing is affixed to the positioning nut so that rotation of the adjustment cap results in elevational movement of the adjustable front shoe.
- a tension spring is connected between the front end of the adjustable shoe and the housing to cancel out tolerance play between the adjustable shoe and the housing. Because the tension spring works with the operator as he bears down upon the tool, no unwanted movement or wobble of the adjustable front shoe results.
- the preferred embodiment of the present invention includes means for calibrating the elevation adjustment mechanism so that when the scale provided on the adjustment cap reads zero, the adjustable shoe is set for zero cutting depth.
- a positive park position is also provided which when engaged sets the adjustable shoe below zero elevation so that the cutting blades will not mar the surface upon which the tool is placed.
- the adjustable front shoe 30 includes an integral socket-like projection 32 extending upwardly from the base thereof.
- Projection 32 also contains diametrically opposed, radially outwardly extending integral flanges 34 which are adapted to be received within a pair of slots 36 ( Figure 3) formed by boss members 38 in housing 22.
- the left-hand housing member shown in Figure 3 is illustrative of the complementary-shaped right-hand housing member.
- the flanges 34 serve to laterally stabilize the adjustable front shoe 30 as well as prevent the front shoe 30 from rotating relative to the housing 22.
- An S-shaped rod 40 is fixedly mounted at one end in the socket-like projection 32 of adjustable front shoe 30.
- An elevation positioning nut 42 is threadedly engaged to the upper end of rod 40.
- Elevation positioning nut 42 is rotatably mounted within a race 44 formed in housing 22 by the joinder of the right-hand and left-hand halves.
- the race 44 permits rotation of elevation positioning nut 42 relative to the housing 22 but prevents elevational movement with respect thereto.
- a scale 64 is provided on the top surface of control knob 46 which is referenced to an arrow 62 ( Figure 12) located on the outer surface of housing 22.
- the scale 64 on control knob 46 is calibrated in the following manner. Initially, with the control knob 46 removed, the elevation adjustment nut 42 is rotated until the adjustable front shoe 30 is located in the zero depth of cut position. The control knob 46 is then properly oriented and fastened onto elevation adjustment nut 42 in the manner described so that the reference arrow 62 on housing 22 is aligned with the zero indication on the scale. Thereafter, manual rotation of control knob 46 will cause rotation of elevation adjustment nut 42 and a corresponding variation in the elevational position of front shoe 30, which will be reflected in the reading on the control knob scale 64.
- the present tension spring 70 works with the operator as he bears down upon the tool during operation.
- the adjustable front shoe 30 appear to "float" as in the case of a compression spring when the force of the spring is balanced by the downward force exerted by the operator.
- the present tension spring 70 works with the natural tendencies .of the operator, the adjustable front shoe 30 is always maintained in the desired elevational position.
Landscapes
- 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)
Abstract
Description
- The present invention relates to portable power planers and in particular to an improved depth of cut adjustment mechanism for a power planer. In general, portable power planers comprise a motor driven rotary cutter head having one or more cutting blade assemblies disposed thereon for performing a planing operation on the surface of a workpiece as the cutter head rotates. The bottom surface of the tool consists of a fixed shoe located rearwardly of the cutter head and an adjustable shoe disposed forwardly of the cutter head. As the front shoe is adjusted upwardly or downwardly, the cutting depth of the cutting blade of the planer is adjusted accordingly.
- The adjustable front shoe of a portable power planer typically includes an integral stem or sleeve that is threaded either directly to an adjustment cap disposed atop the front end of the housing or to a threaded shaft or bolt that is in turn fastened at its other end to the adjustment cap for rotation therewith. In either arrangement, however, a powerful compression spring is interposed about the sleeve between the shoe and the housing to maintain the elevation of the adjustable shoe in the position set by the operator. The compression spring is held in compression between the adjustable shoe and the housing and must be of sufficient strength to resist the natural tendency of the operator to bear down upon the planer when performing a planing operation, and yet be sufficiently compressible to permit convenient upward adjustment of the adjustable front shoe. As a consequence, in some planers having conventional depth of cut adjustment mechanisms, the operator can overcome the thrust force of the compression spring and dislodge the adjustable shoe from its preset position, thereby causing an undesired variation in the depth of cut.
- Accordingly, it is the primary object of the present invention to provide an improved depth of cut adjustment mechanism for a portable power planer which accurately maintains the preset position of the adjustable shoe when the operator bears down upon the tool.
- Additionally, it is an object of the present invention to provide such a depth of cut adjustment mechanism for a power planer which utilizes a tension spring which works with the operator to take up the tolerance play at the interface between the adjustable shoe and the tool housing.
- Furthermore, it is an object of the present invention to provide such a depth of cut adjustment mechanism for a power planer that substantially reduces the space required within the tool housing, as well as the manufacturing cost of the tool, as compared to conventional prior art constructions.
- In general, the elevation adjustment arrangement according to the present invention includes an adjustable shoe having fixedly attached thereto a rod extending upwardly therefrom which is threadedly engaged at its upper end to an elevation positioning nut rotatably mounted in the housing and fixed against elevational movement relative thereto. An adjustment cap disposed atop the housing is affixed to the positioning nut so that rotation of the adjustment cap results in elevational movement of the adjustable front shoe. A tension spring is connected between the front end of the adjustable shoe and the housing to cancel out tolerance play between the adjustable shoe and the housing. Because the tension spring works with the operator as he bears down upon the tool, no unwanted movement or wobble of the adjustable front shoe results.
- In addition, the preferred embodiment of the present invention includes means for calibrating the elevation adjustment mechanism so that when the scale provided on the adjustment cap reads zero, the adjustable shoe is set for zero cutting depth. A positive park position is also provided which when engaged sets the adjustable shoe below zero elevation so that the cutting blades will not mar the surface upon which the tool is placed.
- Additional objects and advantages of the present invention will become apparent from a reading of the detailed description of the preferred embodiment which makes reference to the following set of drawings in which:
-
- Figure 1 is a side elevational view of a power planer incorporating the depth of cut adjustment mechanism according to the present invention;
- Figure 2 is an enlarged detailed cutaway view exposing the depth of cut mechanism according to the present invention;
- Figure 3 is a side elevational view of the front end of the left-hand portion of the housing;
- Figure 4 is an enlarged sectional view of a portion of the housing half shown in Figure 3 taken along line 4-4;
- Figure 5 is a top plan view of the adjustable front shoe according to the present invention;
- Figure 6 is a sectional view of the elevation adjustment nut according to the present invention:
- Figure 7 is an enlarged sectional view of a portion of the elevation adjustment nut shown in Figure 6 taken along line 7-7;
- Figure 8 is a sectional view of the adjustment cap of the present invention;
- Figure 9 is a bottom plan view of the adjustment cap shown in Figure 8;
- Figure 10 is an enlarged sectional view of a portion of the adjustment cap shown in Figure 8 taken along line 10-10;
- Figure 11 is a top plan view of the adjustment cap shown in Figure 8; and
- Figure 12 is an exploded perspective view of the depth of cut adjustment mechanism of the present invention.
- Referring to Figures 1 and 2, a
portable power planer 20 of the type to which the present invention relates, is conventional in overall layout comprising a clamshell-type housing 22 incorporating a motor-driven cutter head 24 having mounted thereon a pair of cutting blade assemblies 26 for performing a planing operation of the surface of a workpiece as the cutter head 24 rotates. The bottom surface of thetool 20 comprises a fixed shoe 28 located rearwardly of the cutter head 24 and an adjustablefront shoe 30 disposed forwardly of the cutter head 24. Elevational adjustment of thefront shoe 30 causes a corresponding adjustment cf the depth of cut of the cutting blades 26. - With additional reference to Figure 5, the adjustable
front shoe 30 includes an integral socket-like projection 32 extending upwardly from the base thereof.Projection 32 also contains diametrically opposed, radially outwardly extendingintegral flanges 34 which are adapted to be received within a pair of slots 36 (Figure 3) formed byboss members 38 inhousing 22. The left-hand housing member shown in Figure 3 is illustrative of the complementary-shaped right-hand housing member. Theflanges 34 serve to laterally stabilize the adjustablefront shoe 30 as well as prevent thefront shoe 30 from rotating relative to thehousing 22. - An S-
shaped rod 40 is fixedly mounted at one end in the socket-like projection 32 of adjustablefront shoe 30. Anelevation positioning nut 42 is threadedly engaged to the upper end ofrod 40.Elevation positioning nut 42 is rotatably mounted within arace 44 formed inhousing 22 by the joinder of the right-hand and left-hand halves. Therace 44 permits rotation ofelevation positioning nut 42 relative to thehousing 22 but prevents elevational movement with respect thereto. Thus, it will be appreciated that whenelevational positioning nut 42 is rotated,rod 40 and hence adjustablefront shoe 30 are moved in elevation, thereby resulting in a variation in the depth of cut. - With particular reference to Figures 2 and 5, it will be noted that adjustable
front shoe 30 has aridge 50 formed along its rearward end which extends upwardly at an acute angle from the base of theshoe 30.Ridge 50 together with the rearward most tangential surface of socket-like projection 32 form a slot 52 adjacent the back portion ofprojection 32 which is adapted to engage a downwardly projectingwall 54 formed in thehousing 22.Ridge 50 coacts with downwardly projectingwall 54 to prevent rotation of adjustablefront shoe 30 with respect tohousing 22 and also to guide the elevational movement offront shoe 30. As best shown in Figure 2, sufficient clearance is provided between downwardly projectingwall 54 and the base offront shoe 30 to permit adequate elevational adjustment in the position offront shoe 30. - Referring now additionally to Figures 8 and 9, a
control knob 46 is fastened toelevation adjustment nut 42 so as to be exposed atop the forward end ofhousing 22.Control knob 46 is secured toadjustment nut 42 by means of a plurality offlexible fingers 48 which are adapted to grasp the undersurface of acircular ridge 56 formed around thenut 42.Control knob 46 is keyed toelevation adjustment nut 42 so as to rotate therewith by the mutual engagement of corresponding sets offine teeth flexible fingers 48 ofcontrol knob 46 and the outer radial surface ofridge 56 ofnut 42, respectively. The tooth configuration, shown in detail in Figures 7 and 10, is fine enough to permit precise angular positioning ofcontrol knob 46 relative to elevational adjustment nut -2 while at the same time providing a tight connection therebetween. - As best shown in Figure 11, a
scale 64 is provided on the top surface ofcontrol knob 46 which is referenced to an arrow 62 (Figure 12) located on the outer surface ofhousing 22. Thescale 64 oncontrol knob 46 is calibrated in the following manner. Initially, with thecontrol knob 46 removed, theelevation adjustment nut 42 is rotated until the adjustablefront shoe 30 is located in the zero depth of cut position. Thecontrol knob 46 is then properly oriented and fastened ontoelevation adjustment nut 42 in the manner described so that thereference arrow 62 onhousing 22 is aligned with the zero indication on the scale. Thereafter, manual rotation ofcontrol knob 46 will cause rotation ofelevation adjustment nut 42 and a corresponding variation in the elevational position offront shoe 30, which will be reflected in the reading on thecontrol knob scale 64. - In addition, it will be noted that
control knob 46 is provided with a downwardly projectingtab 66 which is adapted to abut astop 68 located on the left-hand portion ofhousing 22. Engagement of thestop 68 bycontrol knob 46 in the counterclockwise direction of rotation provides a positive "park" position wherein the adjustable front shoe is positioned below the zero depth of cut position to prevent the cutting blades 26 from marring the surface upon which the tool is placed. In the preferred embodiment herein, engagement of thestop 68 by thecontrol knob 46 in the clockwise direction of rotation corresponds to the maximum cutting depth of 0.5 millimeters. - Returning to Figure 2, a
tension spring 70 is connected between thesocket portion 32 of adjustablefront shoe 30 and the front ofhousing 22. Thespring 70 is maintained under tension and serves to cancel out any tolerance play which may exist between the adjustablefront shoe 30 and thehousing 22, thus avoiding a disconcerting wobble movement in the front shoe. In addition, it will be noted thattension spring 70 is disposed so that its axis is substantially parallel with the axes of S-shaped rod 40 at its upper and lower ends to prevent binding ofadjustment nut 42. It is also preferred thatspring 70 be mounted to thesocket portion 32 ofadjustable shoe 30 closelyadjacent rod 40 to minimize the moment created by the slightly offset tension force of thespring 70 relative to the axes ofrod 40. - Significantly, it will be appreciated that, unlike conventional prior art mechanisms which utilize strong compression springs, the
present tension spring 70 works with the operator as he bears down upon the tool during operation. Thus, at no point does the adjustablefront shoe 30 appear to "float" as in the case of a compression spring when the force of the spring is balanced by the downward force exerted by the operator. In other words, because thepresent tension spring 70 works with the natural tendencies .of the operator, the adjustablefront shoe 30 is always maintained in the desired elevational position. - In addition, as will readily be appreciated by those skilled in the art, the use of the substantially
smaller tension spring 70 in combination with the S-shapedrod 40 significantly reduces the space required within thetool housing 22 when compared to conventional compression spring designs. Moreover, by eliminating the heavy compression spring of prior art designs, a significant reduction in manufacturing cost is also realized. - While the above description constitutes the preferred embodiment of the present invention, it will be appreciated that the invention is susceptible to modification, variation and change without departing from the proper scope or fair meaning of the accompanying claims.
Claims (10)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE8080105747T DE3069839D1 (en) | 1980-09-24 | 1980-09-24 | Depth of cut adjustment mechanism for a power planer |
EP80105747A EP0048304B1 (en) | 1980-09-24 | 1980-09-24 | Depth of cut adjustment mechanism for a power planer |
AT80105747T ATE10816T1 (en) | 1980-09-24 | 1980-09-24 | CHIP THICKNESS ADJUSTMENT MECHANISM FOR A POWER DRIVEN HAND PLANE. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP80105747A EP0048304B1 (en) | 1980-09-24 | 1980-09-24 | Depth of cut adjustment mechanism for a power planer |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0048304A2 true EP0048304A2 (en) | 1982-03-31 |
EP0048304A3 EP0048304A3 (en) | 1982-08-18 |
EP0048304B1 EP0048304B1 (en) | 1984-12-19 |
Family
ID=8186816
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP80105747A Expired EP0048304B1 (en) | 1980-09-24 | 1980-09-24 | Depth of cut adjustment mechanism for a power planer |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0048304B1 (en) |
AT (1) | ATE10816T1 (en) |
DE (1) | DE3069839D1 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0124651A1 (en) * | 1983-01-12 | 1984-11-14 | Robert Bosch Gmbh | Plane, especially an electrically operated hand planing machine |
EP0133814A1 (en) * | 1983-08-11 | 1985-03-06 | Black & Decker Inc. | A portable power planer |
DE3441943A1 (en) * | 1984-11-16 | 1986-05-28 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Portable electric plane |
US4694735A (en) * | 1984-10-22 | 1987-09-22 | Toyota Jidosha Kabushiki Kaisha | Piston for internal combustion engine |
US4751234A (en) * | 1982-06-17 | 1988-06-14 | Rhone-Poulenc Sante | Certain N-alkyl-2-[(quinolin-3-yl)-tetrahydro-pyran or furan]-2-carbothiamide 1-oxide derivatives useful for treating hypertension |
US4762021A (en) * | 1983-09-27 | 1988-08-09 | Tochigifujisangyo Kabushikigaisha | Transfer case for four-wheel-drive vehicles |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR563376A (en) * | 1922-03-09 | 1923-12-04 | Improvements made to hand machines for working wood and similar materials on surfaces with a rectilinear direction | |
GB248253A (en) * | 1925-07-30 | 1926-03-04 | Gottfried Jehle | Improvements in hand planing machines |
CH297502A (en) * | 1952-03-02 | 1954-03-31 | Metap S A | Portable motorized machine for woodworking. |
US2746499A (en) * | 1952-05-03 | 1956-05-22 | Leo O Greeley | Powered hand plane |
DE1030988B (en) * | 1956-04-20 | 1958-05-29 | Lutz Kg Maschf Eugen | Device for adjusting the chip limiter on hand planes with a rotating tool with face and face cutting edges |
-
1980
- 1980-09-24 EP EP80105747A patent/EP0048304B1/en not_active Expired
- 1980-09-24 AT AT80105747T patent/ATE10816T1/en not_active IP Right Cessation
- 1980-09-24 DE DE8080105747T patent/DE3069839D1/en not_active Expired
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR563376A (en) * | 1922-03-09 | 1923-12-04 | Improvements made to hand machines for working wood and similar materials on surfaces with a rectilinear direction | |
GB248253A (en) * | 1925-07-30 | 1926-03-04 | Gottfried Jehle | Improvements in hand planing machines |
CH297502A (en) * | 1952-03-02 | 1954-03-31 | Metap S A | Portable motorized machine for woodworking. |
US2746499A (en) * | 1952-05-03 | 1956-05-22 | Leo O Greeley | Powered hand plane |
DE1030988B (en) * | 1956-04-20 | 1958-05-29 | Lutz Kg Maschf Eugen | Device for adjusting the chip limiter on hand planes with a rotating tool with face and face cutting edges |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4751234A (en) * | 1982-06-17 | 1988-06-14 | Rhone-Poulenc Sante | Certain N-alkyl-2-[(quinolin-3-yl)-tetrahydro-pyran or furan]-2-carbothiamide 1-oxide derivatives useful for treating hypertension |
EP0124651A1 (en) * | 1983-01-12 | 1984-11-14 | Robert Bosch Gmbh | Plane, especially an electrically operated hand planing machine |
EP0133814A1 (en) * | 1983-08-11 | 1985-03-06 | Black & Decker Inc. | A portable power planer |
US4762021A (en) * | 1983-09-27 | 1988-08-09 | Tochigifujisangyo Kabushikigaisha | Transfer case for four-wheel-drive vehicles |
US4694735A (en) * | 1984-10-22 | 1987-09-22 | Toyota Jidosha Kabushiki Kaisha | Piston for internal combustion engine |
DE3441943A1 (en) * | 1984-11-16 | 1986-05-28 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Portable electric plane |
Also Published As
Publication number | Publication date |
---|---|
ATE10816T1 (en) | 1985-01-15 |
EP0048304B1 (en) | 1984-12-19 |
DE3069839D1 (en) | 1985-01-31 |
EP0048304A3 (en) | 1982-08-18 |
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