US2891587A - Wood heel block doweling machine - Google Patents

Description

June 23, 1959 E. E. JOI NER, JR

WOOD HEEL BLOCK DOWELING MACHINE Filed July 6, 1956 3: III 9 1; r L.

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WWO N00 WON NNN 0mm QQQ v WNW/I WWW WNW NW QQQ United States Patent WOOD HEEL BLOCK DOWELIN G MACHINE Edgar E. Joiner, Jr., Andover, Mass., 'assignor, by mesne assignments, to Fred W. Mears Heel Company, Inc., Lawrence, Mass., a corporation of Massachusetts Application July 6, 1956, Serial No. 596,215

4 Claims. (Cl. 144-205) This invention relates to machines for doweling wood heel blocks to form, respectively, the lower portions of composite wood heel blocks which are grooved, turned and concaved in the usual manner to provide composite wood hools such as are disclosed in British Letters Patent No. 478,184 accepted January 13, 1938, on an application filed in the names of Bezemer et a1.

It is an object of the present invention to provide a machine by the use of which the above referred to wood heel blocks may be uniformly doweled at a minimum cost. With the above object in view there is provided a wood heel doweling machine in which the operator places a wood heel block to be doweled in a predetermined position and then depresses a lever causing hereinafter described mechanisms of the machine automatically to dowel the block and to eject it from said machine. The present invention consists in the novel features hereinafter described reference being had to the accompanying drawings which illustrate one embodiment of the invention selected for purposes of illustration, said invention being fully disclosed in the following description and claims.

In the drawings,

Fig. 1 is a front View, partly broken away and partly in section, of the illustrative machine;

Fig. 2 is a view of a cutter of the machine on the line IIII of Fig. 1;

Fig. 3 shows a knee pad operated mechanism for controlling operation of the machine as viewed on the line IIIIII of Fig. 4;

Fig. 4 is a plan view of mechanism which is illustrated in Fig. 3 and is operated by the use of a knee pad;

Fig. 5 is a front view showing on an enlarged scale portions of the machine illustrated in Fig. 1;

Fig. 6 is a front view, partly broken away, showing in detail mechanism for supporting a work carrier slide of the illustrative machine;

Fig. 7 shows, in perspective, a composite wood heel block used in the manufacture of what are commonly known as two-part heels;

Fig. 8 shows in full lines a lower block of the composite wood heel block shown in Fig. 7, the portion of the block removed by the use of the present machine being shown in dash lines;

Fig. 9 is a view on the line IX-IX of Fig. 1 showing the machine, partly broken away, in side elevation;

Fig. 10 is a front view of a wood heel block carrier slide of the illustrative machine at the end of a trimming stroke of said slide;

Fig. 11 is a section on the line XIXI of Fig. 1;

Fig. 12 shows details of an impulse switch which may be used advantageously in the illustrative machine; and

Fig. 13 is a wiring diagram for use in illustrating the operation of the machine.

The illustrative machine is disclosed with reference to operating upon a wood block 20 to form thereon a cylindrical dowel portion 22 shaped and arranged to be reice ceived by and secured in a bore 24 (Fig. 7) of a drilled wood block 26. The blocks 20 and 26 which are assembled and secured together form a composite wood heel 1 block 28 from which a wood heel 30 is formed. The

blocks 26 and 20 of the composite wood heel block 28 may be described as upper and lower heel blocks and have their grain extending, respectively, lengthwise and heightwise of said composite wood heel block and, accordingly, of the heel formed from said block. The various advantages gained by forming the heel 30 from the composite heel block 28 are set forth in said British Letters Patent No. 478,184, the main advantage being that such a heel is much stronger than a wood heel of the conventional type made from a one-piece wood heel block the grain of which extends generally lengthwise of the block and, accordingly, of the heel formed from this block.

The wood heel block 20 to be doweled is manually placed on a carrier or carrier slide 32 comprising a dovetail portion 34 mounted for horizontal reciprocatory movement toward and away from a dowel chucking cutter or tool 36, which is rotatable about a fixed axis 38, in a rectilinear dovetail guideway 40 formed on a bearing block or guide 42 adjustably mounted on a bracket 44 which may be initially adjusted to different heightwise positions in a guideway 46 of a main frame 48. Threaded into the bracket 44 is a thumb screw 50 rotatably mounted in a bearing plate 52 secured by screws 54 to the main frame 48, a binding screw 56 which is threaded into the main frame and passes through a slot 58 formed in the bracket serving to secure the bracket in its heightwise adjusted position in the guideway 46. The height to which the bracket 44 shall be set in the guideway 46 to accommodate the block 20 of a given thickness 60 (Figs. 8 and 10) may be quickly determined by the use of a scale 62 (Fig. 9) marked on the bracket opposite a pointer 64 secured to one of a pair of gibs which is screwed to and may be considered part of the main frame 48.

In order initially to move the hearing or guide block 42 with relation to the bracket 48 in a horizontal rectilinear path transversely of the axis of rotation 38 to centralize the block with reference to said axis along a dimension 68 (Figs. 8 and 11) of the wood heel block 20, the bearing block 42 may be initially adjusted forwardly and rearwardly of the machine along supporting and guiding faces 70, 70a, respectively, of the bracket 44 with relation to said bracket by turning a thumb screw 72 (Figs. 6 and 9) which is rotatably mounted in a bearing plate 74 secured by screws 76 to the bracket and is threaded into the bearing block. The bearing block 42 may be secured to its adjusted position by a setscrew 80 which is threaded into the block and passes through a slot 82 in the bracket and a collar portion of which is adapted to be forced against a face of a boss of said bracket. By initially adjusting, as above described, the bracket 44 upon the main frame 48, and the bearing block or guide 42 upon the bracket, the woodheel block 20 may be so positioned upon the carrier slide 32 that a lengthwise axis 83 (Figs. 5 and 8) thereof shall be coincident with the axis 38 of the cutter 36. The bearing block or guide 42 may be described as being mounted for initial adjustment in paths disposed at right angles to each other and at right angles to the axis 38 of the cutter 36. The bearing block or guide 42 and the guideway 40 which extends lengthwise of the axis 38, may be described as being initially adjustable parallel to itself in a plane.

The cutter 36 is secured to a shaft 84 forming part of a motor 86 (Fig. 1) secured by screws 88 to a cradle 90 provided with a pair of vertical extensions which house bearings 92 (Fig. 6) (only one shown) for the shaft. The cutter 36 (Fig. 2) comprises a pair of replaceable cutter blades 94 which are forced against shoulders 89 of a head 98 of the cutter by clamp plates 91 secured by screws 96 to the cutter head, said blades having cutting edges 93 arranged tangential to a bore 95 which is formed in said head and extends axially of the cutter and has near its bottom transverse outlets 97 (Fig. for the disposal of chips. The cradle 98 is mounted for initial adjustment lengthwise of its axis 38 along a guideway 188 (Fig. 1) of the main frame 48 which has rotatably mounted on it a hand screw 1112 threaded into the cradle. The cradle 91 is secured in its adjusted position to the main frame 48 by a setscrew 184 which is threaded into the cradle and passes through a slot 106 in the main frame and has a head thereof forced against said frame.

The carrier slide 32 comprises a knurled work supporting plate 108 secured by screws 111) (Fig. 10) to the dovetail portion 34 of the slide which is provided with a vertical bore 112 for receiving a stripper pin 114 constantly urged upward by a spring 116 housed in a recess of the slide and bearing against a collar of said pin. upward movement of the stripper pin being limited by the engagement of the collar with the work supporting plate.

Threaded into a plate 120 screwed to and forming part of the carrier slide 32 is a vertically disposed cylinder 122 having vertically reciprocable in it a piston 124 (Fig. 11) which has secured to it a piston rod 126. Secured to the lower end of the piston rod 126 is a knurled clamp 128 adapted to bear against an upper face of the block 21] positioned in the carrier slide with another face thereof in engagement with a vertical face 130 of the carrier slide, a bevel face of said block being in engagement with a gage 132, which is initially secured in a desired operating position to the supporting plate 108 of the carrier slide by screws 134 extending through slots 136 in the gage and threaded into said supporting plate.

Slidable in a horizontal bore 138 of the carrier slide 32 is an ejector or ejector pin 140 which is normally urged to an inactive position, shown in Fig. 11, by a spring 142 housed in a recess of the slide and bearing against a collar of the ejector pin. A work engaging face of the ejector pin 140 is normally in a withdrawn position behind the vertical work engaging face 13!} of the carrier slide 32, the collar of said pin being in engagement with a stop plate 14 1- (Figs. 9 and ll) secured by screws 146 to said slide 34.

Secured to the bearing block or guide 42 by screws 148 is a cylinder 158 in a bore 152 of which a piston 154 is reciprocable, a rod 156 secured to the piston being movable in a guideway 158 which is formed in an upright wall of the guide and is arranged in alinement with and in back of the ejector pin 140 when the carrier slide 32 is in a retracted, rest or loading and unloading position or station as shown in Fig. 11. The piston 154 is normally moved to an inactive position shown in Fig. 11 by a spring 1611 which is housed in the bore 152 of the cylinder 50 and is moved to the right to effect operation of the ejector pin 14!) in response to the action of high pressure fluid from a line 162 open to an end 164 of the piston. The line 162 extends to a passage 166 (Fig. 13) in a solenoid valve 168 comprising a solenoid slide 1711 which is reciprocable in a cylinder 171 of the solenoid valve and has extending through it a passage 172 and which is normally held in its position shown in Fig. 13 against a shoulder 174 of the solenoid valve by a spring 176, a coil 178 of the valve at this time being de-energized. The cylinder 171 of the solenoid valve 168 has a passage 180 leading to an exhaust line 182 and a passage 184 which is open to a fluid pressure line 186 and, when the coil 178 is energized, the carrier slide 32 at this time being in its loading and unloading position, causes the solenoid slide to move to a position in which the passage 172 of this slide is connected to the pressure line 186 and, accordingly, high pressure fluid is available for the end 164 of the piston 154, thus causing said piston and, accordingly, the rod 156 to move to the right as viewed in Fig. 11 into engagement with the left end of the ejector pin 140 to force from the carrier slide 32 a block 21) which has been moved back to its retracted or loading and unloading position on said carrier slide, the clamp 128 at this time having been raised away from the block.

The dovetail portion or block 34 of the carrier slide 32 has a bifurcated portion 1188 (Figs. 1, 5, 9 and 10) which carries a coupling pin 190 passing through a bore 192 in a cap nut 194 threaded onto a leading end of a piston rod 196 mounted for sliding movement in a cylinder 198 secured by screws 2% to a back plate 202 secured to and forming part of the bearing block or guide 42.

Secured to the clamp 128 and slidable in a bore 284 of the plate 120' of the carrier slide 32 is a striker mount 206 in which is slidingly supported for upward yielding movement a rod 208 a flange portion of which is normally held in engagement with a shoulder 218 (Fig. 9) of the mount by a spring 212. Secured by screws 214 to the carrier slide 32 is an impulse switch 216 comprising a plunger 218 which is actuated in response to downward movement of the clamp 128, said spring-pressed rod 2118 serving to operate said plunger.

When the machine is idle the piston 124 and a solenoid slide 228 of a solenoid valve 222 which is associated with the cylinder 122 are in their positions shown in Fig. 13. The cylinder 122 has formed in it a pair of passages 224, 226 which extend respectively from a guideway 228 in which the solenoid slide 220 operates to chambers 230, 232 formed by a bore 234 of the cylinder 122 and opposite operating faces 236, 238, respectively, of the piston. The solenoid slide 221) has formed in it a pair of passages 2413, 2413a leading from one side of the slide to an exhaust passage (not shown) and a passage 242 which extends transversely through the slide and, when the machine is at rest, is open to a passage 244- coupled to a high pressure fluid line 246. It will thus be apparent that when the machine is powered but at rest high pressure fluid is available for the face 236 of the piston 124 and the face 238 of the piston is open to exhaust with the result that said piston and. accordingly, the clamp 128 are held in their raised posi tions with relation to the work support plate 108 of the carrier slide 32. The solenoid slide 2211 of the solenoid valve 222 is moved to the left and to the right as viewed in Fig. 13 in response to the energizing of coils 248, 250 respectively of this valve.

The machine is powered by closing a main switch 252 to energize a primary coil 254 of a transformer 256, thus energizing a secondary coil 258 of the transformer. The coil 250 of the solenoid valve 222 is energized to operate the clamp 128 in response to the pressing of a plunger 264) of an impulse switch 264 across terminals of this switch, thus causing the solenoid slide 2211 to move to its dash-dot position, shown in Fig. 13, and thus to connect the passage 226 to the high pressure line 246 and to connect the line 22 1 to exhaust.

The impulse switch 216 as well as hereinafter referred to impulse switches, electrically interconnected as shown in the wiring diagram (Fig. l3), may have the general form of commercial switches one of which is shown in detail in Fig. 12. Such a switch comprises a housing 266 provided with a rectilinear bore 261 receiving the plunger 218, said plunger being normally held in its idle or retracted position against stop face 270 of the housing by a spring 272. Fixed to the housing 266 is a pin 274 which passes through slots 276 formed in a lever 27 8 upon which a roll 2811 is rotatably mounted and which is normally held by a spring 282 in its position shown in Fig. 12 with the lower ends of the slots 276 in engagement with the pin 274, said roll, when the plunger is in its idle position, normally engaging in a circular channel 284 formed in the plunger. Slidable in a box 286 screwed to the housing 266 is a plunger 288 which, when depressed against the action of a spring (not shown), bridges contacts 290 of the switch. The plunger 218 also has formed in it a wide circular channel 292 which is separated from the circular channel 284 by a land or band 294. When the plunger 218, which corresponds to the plungers of the above-mentioned impulse switches, is moved against the action of the spring 272, the lever 278 is swung clockwise about the pin 274, which is then in engagement with the lower ends of the slots 276, causing the plunger 288 to be moved momentarily across the contacts 290 against the action of the above-mentioned spring (not shown). As the plunger 218 moves back to its retracted position under the action of the spring 272, a shoulder 296 at one side of the land or band 294 causes the lever 278 to be moved against the action of the spring 282 to a position in which the upper ends of the slots 276 are in engage ment with the pin 274, the lever at this time being cammed away from the plunger 218, the construction and arrangement being such that the roll 280 at this time does not have suificient outward swinging movement imparted to it to cause the lever 278 to be swung against the plunger 288 during retractive movement of the plunger 218. As the land or band 294 of the plunger 218 moves past the roll 280 of the lever 278 during retractive movement of the plunger, the lever, acted upon by the spring 282, is moved to its idle or starting position shown in Fig. 12 ready, upon movement of the plunger 218 from its idle position, to be forced with a slight dwell across the contacts 290.

The plunger 260 of the impulse switch 264 is conveniently operated by swinging counterclockwise, as viewed in Fig. 4, against the action of a spring 298, a knee pad 300 secured to an arm 302 which is pivotally mounted on a flange of an angle bar 304 welded to a post 306 secured to the main frame 48. The impulse switch 264 and an impulse switch 308 (Figs. 3, 4 and 13) hereinafter referred to and having a plunger 310, are screwed to the angle bar 304 which has adjustably secured to it a plate 312 carrying a spring biased plunger 314 adapted to be moved into a hole 316 formed in an extension 318 of the arm 302 whereby to prevent movement of said am when repairs or adjustments are being made to the machine. Counterclockwise movement of the arm 302, as viewed in Fig. 4, is limited by the engagement of a nut 320 threaded onto a screw 322, which is carried by the arm. and passes through a hole 324 in a depending flange of the angle bar 304, with one side of said flange, clockwise movement of the arm under the action of the spring 298 being limited by the engagement of a nut 326, which is threaded onto the screw 322, with an opposite side of said flange.

As the clamp 128 carried by the lower end of the piston rod 126 is forced against the block 20 positioned upon the carrier slide 32, the rod 208, which is yieldingly mounted on the striker mount 206, depresses the plunger 218 of the impulse switch 216 with the result that a coil 328 of a solenoid slide 330, which forms part of a solenoid valve 332 and is movable in a guideway 334 of this valve, is energized thus causing said slide to move to its dash-dot position shown in Fig. 13. It will be noted that the piston rod 196 which reciprocates the carrier slide 32 extends through the left end of the cylinder. 198, as best shown in Fig. 5, and has threaded onto it a nut 336 which is adapted to engage an abutment face 338 of the cylinder 198 to insure as a safety measure that the feeding movement of the carrier toward the cutter 36 shall be limited. In view of this construction 6 the solenoid valve 332 is mounted behind the cylinder 198 as shown in Fig. 9 instead of at the head of the cylinder in accordance with common practice. In the illustrative showing in Fig. 13, however, the solenoid valve 332 is illustrated as being positioned at one end of the cylinder 198.

The cylinder 198 has associated with it lines 340, 342 extending from the guideway 334 of the solenoid Valve 332 into chambers 344, 346 formed, respectively, by a bore 348 of the cylinder and faces 350, 352 of a piston 354 secured to the rod 196, said cylinder also having a passage 356 which extends to the guideway 334 and is connected to a high pressure line 358. The solenoid slide 330 has formed in it a pair of passages 360, 360a extending from one side of the slide to exhaust and has formed in it a passage 362 extending transversely across the slide. When the slide 330 of the solenoid valve 332 is in its full line position shown in Fig. 13 the faces 350, 352 of the piston 354 are open, respectively, to exhaust and to high pressure fluid and the piston is in a retracted position and, accordingly, the carrier slide 32 is in its retracted or loading and unloading position shown in Fig. 1.

When the solenoid slide 330 has been moved to its dash-dot position shown in Fig. 13 in response to the energizing of the coil 328 of the solenoid valve 332 rendered active by engagement of the rod 208 with the plunger 218 of the impulse switch 216, the high pressure line 358 is open to the face 350 of the piston 354 and, since the dovetail guideway 40 for the carrier slide 32 is parallel to the axis 38 of the cutter 36, the carrier moves in a rectilinear path toward the cutter causing the cylindrical dowel portion or dowel 22 to be formed on said block 20.

Movement of the carrier slide 32 toward the cutter 36 and, accordingly, of the 'block 20 into said cutter is limited by the engagement of a screw 364, which is threaded into a striker bar 366 secured to the piston 196 between the coupling sleeve 194 and a nut 368 threaded onto the piston, with a plunger 370 of an impulse switch 372. As the plunger 370 is moved across the terminals of the impulse switch 372 a coil 374 of the solenoid valve 332 causes the solenoid slide 330 to be moved back to its full line position shown in Fig. 13 with the result that high pressure fluid is available for the face 352 of the piston 354 and the face 350 of this piston is open to exhaust, said piston thus returning to its idle starting position against the outer end of the cylinder 198 to move the carrier slide 32 back to its loading and unloading position and to hold it in this position.

Secured to the back plate 202, which as above explained is secured to and maybe considered part of the bearing block or guide 42, are unclamping and ejector impulse switches 376, 378 having plungers 380, 382, respectively, which are engaged in succession by the upper portion of the striker bar 366 just before the carrier 32 reaches the rearward limit of its retractive movement. Engagement of the striker bar 366 with the plunger 380 causes the terminals of the unclamping switch 376 to be bridged and thus causes the coil 248 of the clamping solenoid valve 222 to be energized and the solenoid slide 220 to be moved to its full line position shown in Fig. 13 with the result that high pressure fluid is available for the face 236 of the piston 124 which causes the clamp 128 to be moved to its raised position away from the block which has been doweled.

Immediately after engaging the plunger 380 the striker bar 366 engages the plunger 382 of the impulse switchfluid from the line 162 to move the piston 154 to theright against the action of the spring 160 and thus to move the ejector or ejector pin to the right against the action of the spring 142 with the result that the unclamped wood heel block which has been doweled is ejected from the carrier slide 32. As soon as the coil 173 has been ie-energized the spring 176 returns the solenoid slide 170 to its idle position against the shoulder 17 and the springs 142, 160, return the ejector pin 140 and the piston 156respectively to their retracted or inactive positions shown in Fig. 11, pressure against the face 352 of the piston 354 serving to retain the carrier 32 in its loading and unloading position.

The impulse switch 308 which is operated by the arm 302 in response to pressure against the knee pad 309 may be closed at any time during the operation of the machine to cause the coil 374 to be energized and, accordingly, the carrier slide 32 to return immediately to its loading and unloading position. In order manually to unclamp the block 20 from the carrier 32 during the operation of the machine there is provided an impulse switch 384 having a plunger 386 arranged at a convenient place to be pressed by the operator.

in the use of the machine the operator, after effecting the various above described setting-up adjustments to insure that when the wood heel block 29 is placed on the carrier 32 its axis 83 shall be coincident with the axis 33 of the cutter 36, closes the main switch 252 and after positioning the block on the carrier presses the plunger 26% of the impulse switch 264 causing the clamp 128 to secure the block in the machine.

As the clamp 128 is forced against the block 2t) positioned in the machine the carrier 32 is automatically moved toward the cutter 36 by means above described to move the block into the cutter whereby to form the cylindrical dowel portion 22 of the block. As above explained, movement of the block 20 on the carrier 32 into the cutter 36 is limited by the engagement of the screw 3'54 with the plunger 37% of the impulse switch 372 whereby to cause the carrier 32 and accordingly the block to move back to its starting position determined by the engagement of the piston with the left end of the cylinder 198. As the carrier 32 arrives at its starting or rest position the unclamping and ejector impulse switches 376, 378 respectively are closed with the result that the doweled block is unclamped from the carrier and is there after ejected from said carrier.

Having thus described my invention, what I claim as new and desire to secured by Letters Patent of the United States is:

1. In a machine for use in the manufacture of heels, a dowel chucking cutter rotatable about an axis, a guide positioned adjacent to the cutter and having a guideway extending lengthwise of said axis, a carrier slide mounted for movement along said guideway, means for position ing on the carrier slide at a loading and unloading station a heel block which is to be doweled, power operated means for clamping the positioned block to the slide, means for actuating said power operated clamping means to move to clamp the block, feeding means actuated by movement of said clamping means for moving said carrier slide along said guideway from said loading and unloading station toward the cutter to move the block into the cutter to form a doweled portion of said block, means operated by movement of said carrier slide toward the cutter for reversing said feeding means to move the carrier slide toward said loading and unloading position, means operated by movement of the carrier slide toward said loading and unloading station for operating said power operated clamping means to release the heel block, and ejector means operated by movement of said slide toward said loading and unloading station for ejecting the block from said slide.

2. In a machine for use in the manufacture of heels, a dowel chucking cutter rotatable about an axis, a guide which has a guideway extending lengthwise of said axis, a carrier slide mounted in said guideway for movement toward and away from the cutter, fi'Llld pressure means for transferring from a retracted position the carrier slide along said guideway toward and away from the cutter, means for positioning a heel block on the carrier slide, a manually actuated member, fluid pressure means actuated by movement of said member for clamping the block to the slide, a solenoid valve, a switch mounted on the slide and actuated by movement of the block clamping means for operating said solenoid valve to render said first-named fluid pressure means active to move the carrier slide along said guideway from its retracted position to a projected position to form a dowel portion on the block, means operated by movement of the carrier slide toward said projected position for operating said solenoid valve to render said first-named fluid pressure means effective to rettun the carrier slide to its retracted position, means operated by movement of the carrier slide toward its retracted position for causing said secondnamed fluid pressure means to effect movement of the clamp away from said block, an ejector mounted on the carrier slide, and means operated in timed relation with the clamp for causing the ejector to force the block from the carrier slide after said block has been unclamped from said slide.

3. In a machine for doweling wood heel blocks, a dowel chucking cutter mounted for rotation about a fixed axis, a guide having a rectilinear guideway extending lengthwise of said axis, a carrier slide mounted in said guideway for movement toward and away from the cutter, means for positioning a wood heel block upon the carrier slide in a retracted position in said guideway, means for initially moving the guide into different operating positions transveresly of the axis of rotation of the tool in paths respectively disposed at right angles to each other whereby to adjust the carrier slide to a position in which a longitudinal axis of the block positioned in the carrier slide is coincident with the axis of rotation of the cutter, a clamp for securing the positioned heel block to the carrier slide, manually initiated power operated means for causing the clamp to secure the block positioned in the carrier slide to said slide, fluid pressure means for moving the carrier slide along the guideway of said guide, means operated by movement of the clamp for causing said fluid pressure means to move the carrier slide along the guideway of the guide toward the cutter to form a dowel portion of said block, means operated by movement of the carrier slide toward the cutter for causing said fluid pressure means to move the carrier slide in a reverse direction toward its retracted position, means operated by movement of the carrier slide toward its retracted position for causing the clamp to release the heel block from the carrier slide, and fiuid pressure means operated in timed relation with the clamp for automatically ejecting the block from the carrier slide after it has been unclamped from said slide.

4. In a machine of the class described, a dowel chucking cutter rotatable about an axis, a carrier slide, a guide having a rectilinear guideway which extends lengthwise of said axis and in which the carrier slide is mounted for movement, means for positioning a heel block on the carrier slide with a lengthwise axis thereof coincident with the axis of the cutter, a clamp mounted for movement on the carrier slide, a manually actuated member, power operated clamping means operated by movement of said member to force the clamp against the block positioned in the carrier slide, power operated feeding means for reciprocating the carrier slide to and from a loading and unloading position in the guideway of said guide,

"leans operated by movement of the clamp for operating said power operated feeding means to move the carrier slide toward the cutter to form a dowel portion on said block, an ejector mounted on the carrier slide, a spring for constantly urging the ejector to an inactive position on the carrier slide, means operated by movement of the carrier slide toward its loading and unloading position. in

9 10 the guideway of the guide for causing the power operated References Cited in the file of this patent clamping means to move the clamp away from the block, UNITED STATES PATENTS and power operated ejecting means operated in timed relation with the clamp for moving the ejector against the fizgg f fi actlon of its associated spring to e ect the block having 5 2556:4115 Buck June 1951 the dowel portion formed thereon from the carrier slide.

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