EP0875345A1 - Tragbare Holzhobelmaschine mit geschaltetem Reluktanzmotor - Google Patents

Tragbare Holzhobelmaschine mit geschaltetem Reluktanzmotor Download PDF

Info

Publication number
EP0875345A1
EP0875345A1 EP98303273A EP98303273A EP0875345A1 EP 0875345 A1 EP0875345 A1 EP 0875345A1 EP 98303273 A EP98303273 A EP 98303273A EP 98303273 A EP98303273 A EP 98303273A EP 0875345 A1 EP0875345 A1 EP 0875345A1
Authority
EP
European Patent Office
Prior art keywords
workpiece
carriage assembly
locking mechanism
support columns
locking
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.)
Withdrawn
Application number
EP98303273A
Other languages
English (en)
French (fr)
Inventor
Michael L. O'banion
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.)
Black and Decker Inc
Original Assignee
Black and Decker Inc
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 Black and Decker Inc filed Critical Black and Decker Inc
Publication of EP0875345A1 publication Critical patent/EP0875345A1/de
Withdrawn legal-status Critical Current

Links

Images

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
    • B27C1/04—Thicknessing machines

Definitions

  • the present invention generally relates to woodworking. More particularly, the present invention relates to a portable wood planing machine for the surface planing of wooden planks or boards.
  • the present invention employs a switched reluctance motor which eliminates the aforementioned problems associated with universal motors, particularly those that employ regenerative or dynamic braking.
  • a portable wood planing machine which includes a switched reluctance motor. Further, the planing machine may also include a carriage assembly locking mechanism for locking the carriage assembly relative to a plurality of vertical support columns to thereby vertically fix the carriage assembly.
  • the carriage assembly locking mechanism includes a plurality of linkages which cooperate to create a locking force between opposing pairs of the vertical support columns.
  • the present invention provides an improved portable wood planing machine for the surface planing of a workpiece such as a wooden board or plank.
  • a workpiece such as a wooden board or plank.
  • the present invention more particularly relates to various features of a planing machine. Many of these various features, which are described in detail below, are shown cooperatively arranged within a single planing machine. However, it will be appreciated that the scope of the present invention as it independently relates to each of the features described is not so limited. In other words, while an exemplary embodiment of a planing machine is shown and described, it will be understood that the various features may be utilised independent from one another.
  • FIG. 10 an exemplary wood planing machine constructed in accordance with the teachings of the present invention is illustrated and identified generally at reference numeral 10.
  • the planing machine 10 is shown to include a frame 12 having a pair of opposing sides 14 and 16, a top 18 and base 20 including a support platen 22 and a pair of support feet 24.
  • the elements of the frame 12 are interconnected in a conventional manner with threaded fasteners 25.
  • the planing machine 10 is also shown to include a carriage assembly 26 including an integrally formed casting 27.
  • the carriage assembly 26 cooperates with the support platen 22 to define a workpiece opening 28.
  • the workpiece opening 28 of the portable wood planing machine 10 is sized to accommodate a workpiece 29 (shown in hidden lines in Figure 1) having a nominal width of twelve and one-half inches or less. Transfer of the portable planing machine 10 is facilitated through a pair of carry handles 30 extending from opposing sides of the top 18 which are retractable to storage positions.
  • the planing machine 10 also includes forwardly extending and rearwardly extending feed tables 36 and 38 for further supporting the workpiece during operation of the planing machine 10.
  • the forwardly and rearwardly extending feed tables 36 and 38 are each pivotally attached to the base 20 through a pair of support arms 40 which are attached to the feed tables 36 and 38 with fasteners. More specifically, fasteners 44 pass through apertures 46 formed in the ends of the support arms 40 and engage threaded apertures 48 formed in integrally formed boss portions 50 of the base 20.
  • the forwardly and rearwardly extending feed tables 36 and 38 are upwardly foldable from their positions shown in Figure 1 to storage positions substantially adjacent the front and rear of the planing machine 10, respectively.
  • a cutter head assembly 52 is shown to be carried by the carriage assembly 26 adjacent the workpiece opening 28 and is generally identified with reference numeral 52.
  • the cutter head assembly 52 includes a cutter head 54 rotationally mounted to the carriage assembly 26 in a generally conventional manner and driven by a belt 56 interconnected to an electric motor (not shown).
  • the cutter head assembly 52 further includes at least one blade 58 removably attached to the cutter head 54. As illustrated, the blade 58 is attachable to the cutter head 54 by fasteners 60 which pass through holes 62 formed in a retention plate 64 and slots 66 in the blade 58 and engage aligning threaded apertures 68 formed in the cutter head 58.
  • Power to the motor is controlled by a manually operated switch 72 extending from the front face of the carriage assembly 26.
  • a manually operated switch 72 extending from the front face of the carriage assembly 26.
  • the cutter head assembly 52 is shielded by a cover 70 assembly.
  • the cover 70 is removably attached to the carriage assembly 26 in a conventional manner to facilitate blade replacement.
  • a workpiece feed arrangement 74 including a pair of feed rollers 76 is also carried by the carriage assembly 26.
  • the feed rollers 80 are positioned adjacent the workpiece opening 28 and are driven by a motor (not shown) located within the carriage assembly 26.
  • a drive arrangement 78 includes a drive chain (partially shown in Figure 2 at 80) which interconnects the motor and the pair of feed rollers 76. During operation, rotation of the feed rollers 80 functions to draw the workpiece 29 through the workpiece opening 28 at a controlled rate and further functions to position the workpiece 29 a constant vertical distance from the cutter head 54.
  • FIG. 3 illustrates one of the support columns which has been identified with reference numeral 82.
  • Each of the plurality of support columns 82 is generally cylindrical and includes a lower end 84 which engages a circular recesses 86 formed in the base 20 of the frame 12.
  • the support columns 82 also include upper ends 88 which engage similar recesses (not shown) formed in the underside of the top 18.
  • Threaded fasteners 90 pass through apertures 92 in the top 18 and base 20 and engage tapped holes (not shown) in the lower and upper ends 84 and 80 of the support columns 82.
  • four support columns 84 support the carriage assembly 24.
  • the carriage assembly 24 may selectively be translated upward or downward along a path of travel and is guided by integrally formed apertures 94 located in the four corners casting 26 of the carriage assembly 24.
  • the depth of cut of the workpiece 40 is selected through adjustment of the height of the carriage assembly 26 relative to the base 20. Adjustment is controlled through manual rotation of a handle assembly 96 interconnected to a pair of drive rods 100.
  • the drive rods 100 threadably engage the casting 27 of the carriage assembly 26 and are interconnected at their lower ends with a sprocket arrangement 102.
  • a coil spring 104 surrounds the lower portion of each of the drive rods 100.
  • the coil springs 104 are operative for producing an upwardly directed force which opposes a substantial portion of the weight of the carriage assembly 26. As a result, a comparable amount of effort is required for vertically advancing the carriage assembly 26 in either of an upward direction or a downward direction.
  • a depth scale 106 is attached the side 14 of the frame 12 which is marked with indicia indicating the desired thickness for the workpiece 29.
  • the depth scale 106 cooperates with a pointer 108 carried by the carriage assembly 26. As the carriage assembly 26 is vertically translated, the location of the pointer 108 on the depth scale 106 indicates the desired thickness of the workpiece 29.
  • carriage assembly locking mechanism 110 constructed in accordance with the present invention will now be described.
  • the carriage locking mechanism is shown to include a manual operable handle 112, two pairs of cooperating locking linkages 114 and post clamps 116 associated with each of the four vertical support posts 82.
  • the post clamps 116 are formed of metal or other suitable memory retaining material and are attached to a mounting member 118 integrally formed with the casting 27. As illustrated, each of the post clamps 116 includes an arcuate clamping portion 120 and a mounting flange 122.
  • the mounting flange 122 includes a pair of apertures 124 which align with apertures 126 formed in a mounting surface 128 of the mounting members 118.
  • the mounting members 118 also include a generally cylindrical guide portion 130 which cooperate with aperture 94 for vertically guiding of the carriage assembly 26.
  • the post clamps 116 are resiliently deflectable from a normal, unclamped position to a clamped position. When in their clamped positions, the post clamps 116 engage their associated support post 82 and thereby prevent vertical translation of the carriage assembly 26.
  • a locking force for deflecting the post clamps 116 is created by the two pairs of locking linkages 110 in response to selective movement of the handle 112.
  • Each pair of the locking linkages 110 is substantially identical and is operable to create a locking force for two of the vertical support posts 82. Given the similarity of the two pairs of locking linkages 110, a complete understanding can be had through reference to the single pair 110 shown in Figures 4 through 6.
  • each pair of locking linkages 110 includes a first linkage of fixed length 134 pivotally attached to a second linkage 136 of variable length for relative rotation about a pivot defined by a reduced diameter end 138 of the handle 112.
  • Opposite ends of the fixed and variable length linkages 134 and 136 are pivotally interconnected with two of the second post clamps 116.
  • the opposite ends of the fixed and variable length linkages 134 and 136 are formed to include apertures 140 which receive fasteners 142 and pass through formed apertures 144 in the post clamps 116.
  • variable length linkage 110 includes first and second members 146 and 148 which are telescopically related.
  • an end 150 of the first member 146 of the variable length linkage 110 is integrally formed to partially define a channel 152 for telescopically receiving an adjacent end 153 of the second member 148.
  • a biasing member preferably in the form of a coil spring 154 is captured by the first and second members 146 and 148 of the variable length linkage 110.
  • the coil spring 154 is retained by opposing prong tabs 156 integrally formed with each of the first and second members 146 and 148 which the coil spring 154 surrounds.
  • the first member 146 of the compressible linkage 136 includes a tab 158 which is used to secure the first and second members 146 and 148 in a telescopic relationship.
  • the tab 158 of the first member 146 is inelastically bent out of the plane of the first member 146 toward the second member 148 where it is permitted to engage a longitudinally oriented slot 160 therein.
  • the limits of travel of the second member 148 telescopically relative to the first member 146 are defined by the longitudinal slot 160.
  • the first and second linkages 134 and 136 are rotatable relative to one another between a unclamped position (shown in Figure 5) and a clamped position (shown in Figure 5).
  • Such rotation of the linkages 13 and 136 is directly controlled by the handle 112.
  • clamping surfaces 120 of the post clamps 116 are displaced from the vertical support columns 82 and vertical translation of the carriage assembly 26 is permitted.
  • the handle 112 is rotated downwardly as shown by the arrow identified with reference letter A in Figure 5
  • the locking linkages 134 and 136 are rotated to an overcentre position and a clamping force causes the vertical support columns 82 to be clamped by the post clamps 116.
  • the biasing member 154 of the compressible linkage 146 functions to maintain a moderate clamping force throughout rotation of the locking linkages 134 and 136 relative to one another. As a result, the locking linkages 134 and 136 can be moved from their overcentre position without undue force being applied to the handle 112.
  • a modified casting 170 is illustrated in cooperative association with a first alternative carriage assembly locking mechanism 172.
  • a simplified view of the casting 170 is illustrated removed from the remainder of the planing machine 10 and is shown to include four apertures 174.
  • the four apertures 174 are adapted to receive a corresponding number of support columns 82.
  • the apertures 174 are toleranced with respect to their corresponding support column 82 such that a minimal amount of operating clearance normally is present between the support columns 82 and their respective apertures 174 when the support columns 82 are not under load. This operating clearance permits the carriage assembly 26 to normally move freely in a vertical direction with respect to the support columns 82 when the handle assembly 96 is operated.
  • the first alternative carriage assembly locking mechanism 172 is shown to include first and second substantially symmetrical locking linkages 176. As will become apparent, each of the locking linkages 176 is operable to create a locking force between two of the vertical support columns 82 and their respective apertures 174. Given the symmetry of the locking linkages 176, a complete understanding can be had through reference to a first of the locking linkages 176 shown in an enlarged view in Figure 11. As shown in Figure 11, the locking linkage 176 includes a first member 178 and a second member 180. The first member 178 is generally S-shaped and includes an aperture 182 located adjacent a first end 184 for rotatably receiving one of the vertical support columns 82.
  • the first member 178 of the locking linkage 176 includes an intermediate segment 186 interconnecting the first end 184 and a second end 188.
  • the second end 188 extends forwardly beyond the carriage assembly 26.
  • the second member 180 of the locking linkage 176 includes a first end 190 having an aperture 192 for receiving a second of the vertical support columns 82 and a second end 194 pivotally attached to the first member 178 with a pivot pin 196.
  • the locking linkage 176 is movable between an unlocked condition in which the carriage assembly 26 is permitted to move freely in a vertical direction with respect to the vertical support columns 82 and a locked condition in which such vertical movement is prohibited.
  • the locked condition is shown in Figure 11 in which the locking linkage 176 deflects the vertical support column 82 into the sides of their corresponding apertures 174.
  • the first member 178 of the locking linkage 176 is rotated in a clockwise direction (as shown with reference to Figure 11)
  • opposing forces are created by the first and second members 178 and 180 against the vertical support columns 82. These forces result in deflection of the vertical support columns 82 which is limited by the apertures 174 in the casting 170 and create significant frictional forces between the vertical support columns 82 and the carriage assembly 26.
  • the geometry of the locking linkage 176 permits a relatively small force to be applied to the second end 188 of the first member 178 for causing a high force to be developed by the locking linkage 176 against the vertical support columns 82.
  • each of the first members 178 are formed to include aligning horizontal apertures 198 through which a draw link 200 is passed.
  • a quick release cam lever 202 is provided at a first end 204 of the draw link 200 for the application of force to move each of the locking linkages 176 to its locked position.
  • an adjusting nut 208 is provided at the second end 206 of the draw link 200 for setting the load required to move the locking linkages 176 to their locked condition.
  • the carriage assembly locking mechanism 210 includes a carriage assembly 26 having a casting 212 formed to include apertures 174 (not specifically shown with respect to the second embodiment) for receiving the vertical support columns 82 of the planing machine 10. As is shown with respect to the first alternative embodiment in Figure 10, an operating clearance normally exists between the vertical support columns 82 and their corresponding apertures 174 which permits relatively free movement of the carriage assembly 26 in a vertical direction.
  • the casting 212 of the carriage assembly 26 is formed to integrally include a pair of column clamping portions 214 associated with two of the vertical support columns 82.
  • the pair of column clamping portions 214 are arranged to cooperate with the two vertical support columns 82 located adjacent a front face 216 of the carriage assembly casting 212.
  • Both of the column clamping portions 214 are defined by a vertical casting split 218 which intersects a horizontal casting split 220.
  • the vertical casting split 218 is disposed so as to intersect the casting aperture 174 of the corresponding vertical support column 82.
  • the vertical casting split 218 extends rearwardly slightly beyond its corresponding vertical support column 82 and extends forwardly to the front face 216 of the carriage assembly casting 212.
  • the horizontal casting split 220 rearwardly extends a distance substantially equivalent to the vertical casting split 218 and similarly extends forwardly to the front face 216 of the carriage assembly casting 212.
  • An aperture 222 is vertically formed through the carriage assembly casting 212 which passes through both of the column clamping portions 214 and which is adapted to receive a draw bolt 224.
  • an eccentric locking lever 226 Adjacent a first end (not shown) of the draw bolt 224, an eccentric locking lever 226 is provided which is movable between a locked position (as shown in Figure 12) and an unlocked position.
  • an adjusting nut 230 is provided which allows the force necessary to move the eccentric locking lever 226 to its closed position to be adjusted.
  • the column clamping portions 214 are resiliently flexed inwardly causing the normally present operating clearances between the casting apertures 174 and vertical support columns 82 to be eliminated. As a result, vertical movement of the carriage assembly 26 with respect to the vertical support columns 82 is substantially prevented.
  • the eccentric locking lever 226 is returned to its unlocked position, the column clamping portions 214 resiliently return outwardly such that the operating clearances are returned between the apertures 174 and the support columns 82.
  • the third alternative embodiment includes a carriage assembly casting 242 which is formed to include four apertures 174 for receiving the vertical support columns 82 of the planing machine 10. Also consistent with the prior described embodiments, the apertures 174 are toleranced so as to provide a normally present operating clearance between the circumferential side wall of the apertures 174 and the corresponding vertical support column 82.
  • the casting 242 is illustrated to include four upwardly extending boss portions 244 adapted to cooperatively engage the four support columns 46.
  • the boss portions 244 are unitarily formed with the casting 242 and are generally C-shaped with an inner surface adapted to contact the corresponding support column 82.
  • the boss portions 244 also include a flange area 246.
  • Each of the boss portions 244 is specifically adapted to cooperate with a clamping portion 248 for clamping one of the support columns 82 and thereby vertically fixing the carriage assembly 26 with respect to the support columns 82.
  • the cooperating clamping portions 248 and boss portions 244 are joined by a threaded fastener 250 and define an aperture for receiving the support column 82.
  • the clamping portions 248 are constructed of a suitable resilient material such as metal and the like so that they are each deflectable between a clamping position and a release position. Normally, the clamping portion 248 is in its release position and clearance is provided between the support column 82 and the aperture cooperatively defined by the clamping portion 248 and the boss portion 244 such that the carriage assembly 26 can be vertically moved with respect to the support columns 82.
  • the locking mechanism 240 is further shown to include a pair of substantially identical linkage arrangements 252.
  • each linkage arrangement 252 is specifically adapted to cooperate with a first pair of support columns 82 adjacent the front of the carriage assembly 26, while the other of the linkage arrangements 252 cooperates with a second pair of support columns 82 adjacent the rear of the carriage assembly 26. More specifically, each linkage arrangement is shown to includes a first link 254 and a second link 256. At a first end 258, the first link 254 is pivotally interconnected to the clamping portion 248 associated with one of the support columns 82. A first end 260 of the second link 256 is similarly pivotally attached to an adjacent clamping portion 248, while the second end 262 is pivotally attached to the first link 254. A second end 262 of each of the first links 254 are joined by a handle 266.
  • the linkage arrangements 252 are simultaneously controlled by moving the handle 266 between an upper position and a lower position.
  • each of the clamping portions 248 In the upper position (as shown in Figure 13) each of the clamping portions 248 is in its release position and the carriage assembly 26 is permitted to move vertically with respect to the support columns 82.
  • the clamping portions 248 are resiliently deflected to their clamping positions causing the cooperating clamping portions 248 and boss portions 244 to "pinch" the support columns 82 and thereby prevent vertical movement of the carriage assembly 26.
  • the interconnection between the linkage arrangement 252 and the clamping portion 248 is shown to alternatively incorporate a tension adjustment mechanism 270.
  • the construction of the clamping portion 248 is modified to include an outwardly extending flange 272.
  • the first end 258 of the first link 254 is modified to incorporate an adjustment slot 274 through which a threaded fastener 276 passes for pivotally interconnecting the first link 254 with the clamping portion 248.
  • An adjustment bolt 278 having a head 280 adapted to abut the first end 258 of the first link 254 passes through an aperture (not shown) formed in the flange 272.
  • a plurality of Belville washers 282 is interdisposed between the flange 272 and the head 280 of the bolt 278.
  • An adjustment nut 284 is provided on the opposite side of the flange 272 for adjusting the tension imparted to the first link 254 by the Belville washers 282.
  • a clamping portion 284 having an alternate construction is illustrated. Similar to the clamping portion 248, clamping portion 284 is adapted to cooperate with one of the boss portions 244 for "pinching" or clamping the support columns 82 to vertically fix the carriage assembly 26 with respect to the support columns 82.
  • the construction of the clamping portion 284 is alternatively shown to incorporate a generally U-shaped portion 286.
  • One of the first and second links 254 and 256 (e.g., the first link 254 in Figure 20) is pivotally interconnected with the clamping portion 284 at an outer leg 288 of the U-shaped portion 286.
  • the locking mechanism 292 includes a carriage assembly casting 294 which is formed to include apertures 174 for receiving the vertical support columns 82 of the planing machine 10. Also consistent with the prior embodiments, the apertures 174 are toleranced so as to provide a normally present operating clearance between the circumferential side wall of the apertures 174 and the corresponding vertical support column 82.
  • the locking mechanism 292 is formed to include a plurality of upwardly extending boss portions 296. As illustrated, the locking mechanism 292 includes four boss portions 296 arranged to cooperatively engage each of the support columns 82. The boss portions 296 are generally C-shaped. Each of the boss portions 296 is adapted to cooperate with a complementary clamping portion 298.
  • the locking mechanism 292 is further shown to include a first linkage arrangement 300 associated with a first pair of the support columns 82 and a second linkage arrangement 302 associated with the other pair of support columns 82.
  • the first and second linkage arrangements 300 and 302 are substantially identical and serve to interconnect an electric actuator 304 and each of the clamping portions 298.
  • the first and second linkage arrangements 300 and 302 are each moveable between a clamping position and a release position. Movement between these two positions is controlled by the electric actuator 304.
  • the electric actuator 304 can be of any suitable construction and is operative for forcing each of the linkage arrangements 300 and 302 outward (as shown in Figure 21) when activated.
  • One suitable electric actuator is described below as a solenoid. However, it will be appreciated that a magnet can alternatively be used.
  • the actuator 304 when the actuator 304 is activated, the clamping portions 298 are forced outwardly and cooperate with the boss portions 296 to effectively pinch the support columns 82. As a result, vertical movement of the carriage assembly 26 with respect to the support columns 82 is prevented.
  • the actuator 304 automatically operates to force the clamping portions 298 against the boss portions 296 whenever the motor of the planing machine 10 is energised.
  • the carriage assembly 26 illustrated is shown to include upper and lower casting portions 312 and 314.
  • the upper casting portion 312 is shown removed from the simplified top view of Figure 22.
  • the locking mechanism 310 includes a carriage assembly casting 316 which is formed to include apertures 174 for receiving the vertical support columns 82 of the planing machine 10. Also consistent with the prior discussed embodiments of a locking mechanism, the apertures 174 are toleranced so as to provide a normally present operating clearance between the circumferential side wall of the apertures 174 and the corresponding vertical support column 82.
  • the partial top view of Figure 22 illustrates the carriage assembly locking mechanism 310 in operative relationship with two of the vertical support columns 82. However, it will be appreciated that a similar mechanism may be symmetrically constructed to cooperate with the other two vertical support columns 82.
  • the carriage assembly locking mechanism 310 is shown to include a manual actuator (partially shown at 318) interconnected to a pair of lock pins 320 through a pair of connecting links 322.
  • the connecting links 322 each include a first end 324 pivotally connected to the actuator 318 and a second end 326 pivotally connected to its respective lock pin 320. While the manual actuator 318 is not shown in detail, it will be appreciated that any suitable mechanism may be incorporated which is operable to apply a force to the connecting links 322 in the direction of arrow C.
  • the lock pins 320 are similarly constructed to each include a tapered distal end 328.
  • the upper and lower casting portions 312 and 314 cooperate to partially define a narrowing channel 330 into which the locking pins 320 are adapted to advance.
  • the channels 330 are disposed adjacent the apertures 174, are open adjacent the apertures 174 and include an arcuate sidewall opposite the aperture 194.
  • the electrical actuator 340 of the present invention is intended to operate a manual carriage assembly locking mechanism such as one of the embodiments discussed herein or similar arrangements and comprises a solenoid 340 which is electrically interconnected with a motor 342 of the planing machine 10.
  • the solenoid 340 includes a plunger (not shown) interconnected with a manual output device (e.g. manual actuator such as the manual actuator 318 shown in Figure 22) of a carriage assembly locking mechanism.
  • the plunger is operative to extend when the solenoid 340 is energised.
  • the solenoid 340 is preferably arranged such that it is energised whenever the motor 342 of the planing machine 10 is energised.
  • the electrical actuator 340 is further associated with a normally closed override switch 346 adapted to deactivate the solenoid 340 to thereby permit minor adjustment to the carriage assembly 26 when the motor 342 of the planing machine 10 is energised.
  • the motor 342 can be a universal motor that is connected to a belt or gear reduction drive for driving the cutter heads. However, it is preferable to use a switched reluctance motor instead as the motor 342 in the planing machine 10.
  • a schematic control circuit is illustrated showing the switched reluctance motor 342 electrically connected to the electronic motor drive 500 and operated by the switch 72.
  • the switch 72 may include first and second contacts. Thus, upon activation of the switch 72, the switched reluctance motor 342 is energised to drive the cutter heads. Upon deactivation of the switch 72,.the second contact can be electrically connected to the electronic motor drive 500 to brake the switched reluctance motor 342.
  • the electronic motor drive 500 can be configured to sense that the switch 72 is open, and then automatically brake the switched reluctance motor 342.
  • the electronic motor drive 500 can be configured in any desired manner to work in conjunction with the switch 72 to brake the switched reluctance motor 342.
  • variable speed control to the switched reluctance motor 342.
  • Another variation can include a soft start, i.e., relatively slow ramp up of motor speed, in the electronic motor drive 500 in order to reduce the strain on a gear reduction drive as well as reduce the starting in rush current to the switched reluctance motor 342. This is an advantage when long extension cords are used.
  • planing machine with switched reluctance motor eliminates wear and tear on brushes and commutators as in prior art universal motors as well as eliminates regenerative or dynamic braking associated with the universal motor. Wear and tear is substantially eliminated because switched reluctance motors rely upon semiconductor switches and complex logic to operate. Because switched reluctance motors are capable of braking, as a result of the semiconductor switches and logic, they can be controlled to provide braking down to near zero speed, thus reducing the total stopping time.
  • the depth stop adjustment mechanism 350 is shown to include a generally toroidal-shaped main body portion 352.
  • the peripheral edge of the main body portion 352 is formed to include a ribbed exterior surface 354.
  • the main body portion 352 defines a central aperture 356 for receiving a pin 358 about which the main body portion 352 may rotate and is adapted to be supported on an upper surface of the base 20 of the planing machine 10 within the workpiece opening 28 (as shown in Figure 3).
  • the depth stop adjustment mechanism 350 can be position in any of a number of locations in which the depth stop screws 210 are disposed to prohibit downward advancement of the carriage assembly 26.
  • the main body portion 352 is further formed to include an upper surface 360 including a plurality of threaded apertures (not specifically illustrated). Each of the apertures is adapted to receive a depth stop screw 362 which can be adjusted to a desired stop setting.
  • the depth stop screws 362 and corresponding apertures in the main body portion 352 are three in number and are set to the common settings of one-quarter inch, one-half inch and three-quarters inch. With a screwdriver, the depth stop screws 352 can be quickly and easily adjusted to any desired height.
  • the depth stop adjustment mechanism 350 further includes a mechanism for positively locating the main body portion 352 in its desired positions.
  • the positive locating mechanism includes a locating ball 264 and a coil spring 266.
  • the locating ball 264 is positioned between the main body portion 352 and the coil spring 266 and is biased by the coil spring into engagement with depressions (not shown) formed in the underside of the main body portion.
  • the depressions correspond in number to the plurality of depth screws 262.
  • the main body portion 352 of the depth stop adjustment mechanism 350 is position so as to partially extend from an opening formed in one of the side walls 14 and 16 of the planing machine. As a result, the depth stop adjustment mechanism 350 may be selectively adjusted by the user from the exterior of the planing machine 10.
  • the user adjusts the depth stop adjustment mechanism 350 to one of the three predetermined settings by positioning the appropriately set depth stop screw 362 inwardly toward the workpiece 29.
  • the depth stop adjustment mechanism 350 of the present invention is readily accessible by the user for quickly and accurately returning of the planing machine 10 to a preset minimum depth. Downward movement of the carriage assembly 26 is eventually opposed by one of the depth stop screws 362, thereby limiting a minimum depth of the workpiece 40.
  • the material removal indicator assembly 370 is shown to indicator 372 pivotally attached to the carriage assembly 26, a workpiece engagement member 374 and a scale 376.
  • the indicator 372 of the material removal indicator assembly 370 of the present invention is formed at a first end 377 to include an aperture for receiving a pin 378 to facilitate pivotal attachment to the carriage assembly 26.
  • the indicator 372 is further shown to include a riser point 380 adapted to contact the workpiece engagement member 374 and a forwardly located portion 382, or tip, for cooperating with the scale 376 which is stamped with indicia incrementally representing the amount of material that is being removed from workpiece 29 during a pass through the workpiece opening 28.
  • the scale 376 is stamped with indicia which begin at .05 inches and increases in increments by .05 inches.
  • the workpiece engagement member 376 is shown to include a mounting flange 384 having apertures adapted to receive pins 386 for attachment to the carriage assembly 26. Integrally formed with the mounting flange 384 is a forwardly extending workpiece engaging portion 388. The workpiece engaging portion 240 is inwardly curved to facilitate entry of the workpiece 29 therepast.
  • the material removal indicator assembly 370 of the present invention can be constructed to include a single integrally constructed component.
  • the riser point 380 of the indicator 372 may alternatively be constructed to integrally include a forwardly extending portion (not shown) intended for direct engagement with the workpiece 29.
  • a forwardly extending portion would be configured similarly to the forwardly extending workpiece engaging portion 388 of the workpiece engagement portion 374.
  • the workpiece engagement portion 374 is resiliently displaced as the workpiece 29 is introduced within the workpiece opening 28.
  • This displacement of the workpiece engagement portion 374 correspondingly results in rotation of the indicator 372 about the pin 378 through contact of the workpiece engagement portion 374 with the riser point 380.
  • the riser point 380 is located on the indicator 372 and is positioned in relationship to the pivot axis defined by the pin 378 such that pivotal displacement of the workpiece engagement portion 374 is magnified by movement of the indicator 372 in front of the scale 376.
  • the scale magnification assembly 400 is adapted to cooperate with the scale 106 attached to the carriage assembly 26 for indicating the desired thickness for a workpiece 29.
  • the scale magnification assembly 400 is shown to include a window portion 402 and an attachment portion 404.
  • the scale magnification assembly 400 is preferably constructed of polycarbonate and is operative for magnifying scale indicia (not shown) located behind the window portion 402. Construction of the scale magnification assembly 400 from polycarbonate serves to reduce parallax and provide for fine reading of the scale indicia.
  • the scale magnification assembly 400 is further shown to include a metal blade 406 horizontally mounted to a rear surface 407 of the window portion 402 which assists in visually identifying appropriate scale indicia.
  • the mounting portion 404 of the scale magnification assembly 400 is formed to include an aperture (not shown) through which a threaded fastener 408 passes for releasably attaching the scale magnification assembly 400 to the planing machine 10.

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)
EP98303273A 1997-04-30 1998-04-28 Tragbare Holzhobelmaschine mit geschaltetem Reluktanzmotor Withdrawn EP0875345A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US4518097P 1997-04-30 1997-04-30
US45180P 1997-04-30

Publications (1)

Publication Number Publication Date
EP0875345A1 true EP0875345A1 (de) 1998-11-04

Family

ID=21936441

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98303273A Withdrawn EP0875345A1 (de) 1997-04-30 1998-04-28 Tragbare Holzhobelmaschine mit geschaltetem Reluktanzmotor

Country Status (1)

Country Link
EP (1) EP0875345A1 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0709155A1 (de) * 1994-10-31 1996-05-01 Emerson Electric Co. Gehrungssäge mit geschaltetem Reluktanzmotor
US5562135A (en) * 1994-12-15 1996-10-08 Emerson Electric Co. Combination woodworking tool
EP0755759A2 (de) * 1995-07-27 1997-01-29 Black & Decker Inc. Tragbare Holzhobelmaschine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0709155A1 (de) * 1994-10-31 1996-05-01 Emerson Electric Co. Gehrungssäge mit geschaltetem Reluktanzmotor
US5562135A (en) * 1994-12-15 1996-10-08 Emerson Electric Co. Combination woodworking tool
EP0755759A2 (de) * 1995-07-27 1997-01-29 Black & Decker Inc. Tragbare Holzhobelmaschine

Similar Documents

Publication Publication Date Title
US6089287A (en) Portable wood planing machine
US5771949A (en) Portable wood planing machine
US5967205A (en) Portable wood planing machine with switched reluctance motor
US5060548A (en) Desk-top circular saw
US4942912A (en) Router attachment
US20060042444A1 (en) Miter saw having two laser oscillators
US5189937A (en) Circular saw arrangement
US20060191392A1 (en) Flat media cutting device
US5239906A (en) Circular saw arrangement
US5816303A (en) Method and apparatus for adjusting the relative positions of two components of a power tool
EP0673721A1 (de) Vorrichtung zum automatischen Zuführen für Schraubenstreifen
JPH06328313A (ja) ドリルプレスのフェンス固定装置
US6880595B2 (en) Apparatus for adjustably positioning a power tool over a work surface
JP2007008063A (ja) ガイド及びこれを備えた携帯用切断工具
US4787430A (en) Duplicating router
US3104687A (en) Radial arm saw
US3733952A (en) Automatic contour machine
EP0755759B1 (de) Bearbeitungsmaschine zum Umformen von Werkstücken
EP0875345A1 (de) Tragbare Holzhobelmaschine mit geschaltetem Reluktanzmotor
US6260460B1 (en) Machining tools having adjustable fences
WO1980002814A1 (en) Copying routing machine
EP2017046B1 (de) Tragbare Hobelmaschine
CA2272187C (en) Apparatus for performing a forming operation on a workpiece
WO2005032778A2 (en) Micro-adjustment device for the angle stop plank of a planer
JP4400007B2 (ja) スライド式卓上切断機

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE GB IT

AX Request for extension of the european patent

Free format text: AL;LT;LV;MK;RO;SI

17P Request for examination filed

Effective date: 19990423

AKX Designation fees paid

Free format text: DE GB

RBV Designated contracting states (corrected)

Designated state(s): DE GB IT

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

17Q First examination report despatched

Effective date: 20020315

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20021030