AU650533B2 - Cutting tool - Google Patents

Description

AUSTRALIA

PATENTS ACT 1990 r,2W COMPLETE SPECIFICATION FOR A STANDARD PATENT (Original) APPLICATION NUMBER:

LODGED:

COMPLETE SPECIFICATION LODGED:

ACCEPTED:

PUBLISHED:

RELATED ART:

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0* rC NAME OF APPLICANT: ACTUAL INVENTOR(S): ADDRESS FOR SERVICE: SALAZAR HOLDINGS PTY LTD ALAN MITCHELL S. C C C

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KELVINi LORD Al 4- Douro Place -Wst .rth

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t- c C Co L. 42-1s, INVENTION TITLE: "CUTTING TOOL" ASSOCIATED PROVISIONAL APPLICATION NOS: ADDRESS FOR SERVICE

ALTERED

PK 6027 The following statement is a full description of this invention including the best method of performing it known to me/us:- 2 The present invention relates to a cutting tool.

In accordance with one aspect of the present invention there is provided a cutting tool comprising a housipg having mounted therein a cutting blade, means being provided for moving the cutting blade in a reciprocal, linear manner, wherein there is provided a longitudinally adjustable foot which is mounted to the housing but spaced therefrom by a foot blade, the foot being located adjacent the cutting blade on one or both sides thereof, and the foot blade being disposed in alignment with the cutting blade and being so configured as to pass through a cut in a S .9 workpiece formed by the cutting blade.

949999 The present invention will now be described, by way of example, with reference to the accompanying drawings, in which:- Figure 1 is a side elevation of a nibbler tool attached to the chuck of an electric drill.

Figure 2 is an upper, perspective view, from the opposite side, of the nibbler tool and electric drill of Figure 1; Figure 3 is an exploded, perspective view of a barrel and blade mounting portion of the nibbler tool of Figures 1 and 2; Figure 4A is a first perspective view of a clamp of the nibbler tool of Figures 1 and 2; Figure 4B is a second perspective view of the clamp of Figure 4A from an opposite side; Figure 5 is a perspective view to an enlarged scale of part of the blade mounting portion shown in Figure 3; Figures 6A to 6F are side elevations of various 3 configurations of blades which may be used in the nibbler tool of the present invention; Figure 7 is an end of a nose arranged to be attached to an end of a barrel of the tool of Figures 1 and 2; Figure 8 is a side elevation of the nose of Figure 7; Figure 9 is a perspective view of a safety cover for use with the tool of Figures 1 and 2; Figure 10 is a perspective view of a patch and tube for use in blowing away chips; Figure 11 is a perspective of an angled cutter attachment for use with the tool of Figures 1 and 2; cool oa s Figure 12 is a side elevation of a nibbler blade of round *cross-section; ee••e S" Figure 13 is a side elevation of a modified form of the tool of Figure 1 arranged to use the blade of Figure 12; 6O S Figure 14 is a front elevation of the blade of Figure 13; eel.

Figure 15 is a blade for use with the tool of the present invention for cutting asbestos sheet or fibre glass; Goss Figure 16 is a side elevation of a cutting head having 0 s 20 mounted thereon the blade of Figure

S.

Figure 17 is a front elevation of the cutting head of Figure 16.

Figure 18 is a schematic side elevation showing the tool of the present invention cutting corrugated material; Figure 19 is a schematic side elevation showing the tool of the present invention cutting angled material; and Figure 20 shows the angular displacement between a fooc and an end of the tool of the present invention. In Figures 1 and 2 of the accompanying drawings, there is shown a 4 nibbler too 10 attached to an electric drill 12. The electrical drill 12 comprises a nose portion 14 on which is mounted a clamp 16. As can be seen in Figure 4, the clamp 16 contains an aperture 18 surrounded by an annular portion. The nose portion 14 fits snugly with the aperture 18 as can be seen in Figures 1 and 2. Further, the clamp 16 comprises a slot 20. The slot 20 is located between an outwardly extending lug 22 which is spaced from an adjacent end 24 of the clamp 16. The clamp 16 is arranged to be tightened on the nose portion 1.4 by a threaded bolt 26 passed through a hole in the lug 22 and threadedly engaging ""with a threaded aperture in the end 24.

Further, spaced from the slot 20, the clamp 16 is provided with a recess 28 which weakens the annular portion about 15 the aperture 18 and enables the clamp 16 to be flexed into and out of engagement with the nose portion 14.

As can best be seen in Figure 4, the clamp 16 comprises a head portion 30 which comprises a lower portion 32 and an upper portion 34. The upper portion 34 comprises a 0 downwardly projecting apertured lug 36 which projects into a recess 38 in the lower portion 32. A pin 40 extends through opposed apertures in the lower portion 32 adjacent the recess 28 and through the aperture in the lug 36 so that the upper portion 34 is hingedly connected to the lower portion 32.

Further, as can be seen in Figure 1, the lower portion 32 contains a slot 42 on the opposite side thereof to the recess 38. A threaded member 44 having an apertured annular end 46 is mounted in the slot 42. A pin 48 extends 5 through opposed apertures in the lower portion 32 and through the aperture in the annular end 46 of the threaded member 44. In this way, the threaded member 44 is pivotally retained in place in the slot 42. Further, the upper portion 34 contains a slot 50 in alignment with the slot 42 and the threaded member 44 extends through and beyond the slot 50. A knurled clamping screw 52 is threadedly engageable with the threaded member 44 so as to secure the upper portion 34 in engagement with the lower portion 32.

The lower portion 32 contains a part spherical recess 54 in o an upper face thereof extending from front to back of the clamp 16. The upper portion 34 also contains a part spherical recess 56 in a lower face thereof extending from front to back of the clamp 16. The recesses 54 and 56, as shown in Figure 4, are opposed to one another.

As shown in Figure 1, when the upper portion 34 is hinged into engagement with the lower portion 32 and secured by the clamping screw 52, a barrel 58 may be releasably 20 secured in place in the opposed recesses 54 and 56. The barrel 58 contains a longitudinal slot 60 (shown in phantom in Figure 3) on its underside. The barrel 68 preferably has locating projections 59 (one of which can be seen) arranged to engage with corresponding recess in the clamp 16 to locate positively the barrel 58 and prevent it rotating in use.

Further, the barrel 58 comprises a central, longitudinally extending circular bore 62 (also shown in phantom in Figure 3) which is in alignment with and in communication with the 6 slot 60. The bore 62 has mounted therein a shuttle 64 in the form of a cylindrical rod. The shuttle 64 has p pair of spaced apertures drilled therein. A respective peg 66 is inserted into each of the apertures in the shuttle 64.

The pegs 66 may be silver soldered to retain them in place in the shuttle 64. Each peg 66 extends through and beyond the slot 60. Each peg 66 contains an intermediate wide portion 68 which abuts against the shuttle 64 when the peg 66 is fully inserted into its respective hole.

Further, each peg has a threaded end 70 remote from the shuttle 64. The portions of the pegs 66 between the wide .i portions 68 and the threaded ends are arranged to have mounted thereon resilient rollers 72. The rollers 72 have washers 74 disposed at each end thereof about the pegs 66 15 and are retained in place on the pegs by means of threadedly engaged nuts 76.

The barrel 58 has a first end 78 and a second end The first end 78 of the barrel 58 has an upper cut away portion 82 and a lower cut away portion 84. The first end 20 78 thus has a residual intermediate leading portion 86 which contains a longitudinally extending slot 88. The slot 88 extends between the upper and lower cut away portion 82 and 84. Further, the bore 62 terminates prior to the cut away portions S2 and 84 but the slot 88 extends rearwardly into the barrel 58 so as to be in communication with the bore 62. The intermediate leading portion 88 has a spaced pair of apertures 89.

A cutting anvil 90 formed of hardening steel which is hardened and tempered after machining is mounted to the 7 upper cutaway portion 82.

The anvil has an upper central recess 92 and a longitudinally extending slot 94 in alignment with the slot 88. Further, there are a spaced pair of apertures 96 on either side of the slot 94. Still further the slot 94 is of a depth sufficient for it to be visible in the central recess 92. The apertures 96 are engageable by screws 97 and are arranged to be aligned with the apertures 89 when assembled.

A wearing plate 98 is mounted to the lower cut away portion 84 so that the wearing plate 98 is in engagement with the intermediate portion 86. The wearing plate 98 also o"o contains a spaced pair of apertures 99 in alignment with the apertures 89 and 96 when assembled.

15 A block 100 which is formed of steel is located against the wearing plate 98.

The block 100 contains a longitudinal slot 102. The block 100 also contains a spaced pair of threaded apertures 101 which are in alignment with the apertures 89,96 and 99 when assembled.

The shuttle member 64 has a forward end 103 which is cut away to form a semi spherical shape having a flat face 104 (see Figure A pair of pegs 106 are mounted to the flat face 104 of the forward end 103 and provide a mounting for a flat nibbler blade 107. Further, the shuttle member 64 may have a longitudinal slot 108 extending rearwardly from the forward end 103.

A semi-spherical cap 110 with a pair of spaced apertures 8 112 is arranged to fit over the forward end 103 of the shuttle 64 in engagement with the pegs 106.

The cap 110 may be connected to a wire 114 which has a right angled portion 116 and a short parallel end portion 118. The wire 114 is arranged to fit in the slot 108 and the right angled portion 116 to extend into an aperture which extends through the shuttle member 64 so that the short parallel end portion 118 is located in a slot 120 (see Figure 3) on the other side of the shuttle member 64.

In this way the possibilities of losing the cap 110 are reduced.

The nibbler blade 107 is arranged to be mounted to the pegs 106 and for this purpose has a pair of spaced apertures 122 adjacent an end thereof. The apertures 122 engage with the 15 pegs 106 and the cap 110 is then engaged with the pegs 106 so as to secure the blade 107 in place.

Access may be gained to the shuttle by loosening the clamping screw 52 and pivoting the threaded member 44 clear of the upper portion 34. The upper portion 34 may then be pivoted upwardly about its hinged connected to the lower portion 32. Then the barrel 58 can be removed from the apparatus. The shuttle 64 and associated pegs 66 may be removed from the barrel 58 by sliding them out of the second end 80 of the barrel 58 along the slot 60 and the bore 62. The nibbler blade 107 can then be fitted to the shuttle 64 in the manner described above. The shuttle 64 with the nibbler blade 107 attached may then be replaced in the barrel 58 and moved forwardly such that the nibbler blade passes through the slot 88 in the first end 78 of the 9 barrel 58 and the slot 94 in the anvil.

Further, a flat foot blade 122 is inserted in the longitudinal slot 102 in the metal block.100. The foot blade 122 is slightly deeper than slot 102 in the metal block 100. Thus, when the screws 97 are passed through the apertures 96, 89 and 99 and threadedly engaged with the apertures 10 and tightened up, the foot blade 122 is firmly clamped in the slot 102 between the metal block 100 and the wear plate 98. The foot blade has a foot 124 mounted at its outer end remote from tie block 100. The foot 124 comprises a pair of plates 126 disposed on opposite sides of the nibbler blade 107 and attached to and extending upwardly from respective sides of an end of the foot blade 122 remote from the block 100 and inclined back towards the 15 barrel 58. The flat nibbler blade 107 is in alignment with the flat foot blade when the apparatus of the present invention is assembled.

The plates 126 of the foot 124 thus pass on either side of nibbler blade 107. Further, the position of the foot *.0 S 20 124 can be readily adjusted by slackening the screws 97 and moving the foot blade 122 into or out of the metal block 100 In the embodiment shown, the nibbler blade 107 has a recess 128 in its upper edge remote from the foot blade 122. The recess 128 is relatively close to but spaced from the forward end of the nibbler blade 107. On the forward stroke of the nibbler blade 107, the recess 128 emerges from within the body of the barrel 58 and is partially exposed at the forwardmost point of travel of the nibbler 10 blade 107. Thus, upon the return stroke of the nibbler blade 107 an exposed forward corner 128a of the recess 128 cuts material such that cutting is performed on the return stroke of the nibbler blade 107. The anvil 90 may be reversible so that it can be reversed if it becomes blunted.

The nibbler blade is moved reciprocably in known manner by threadedly fitting a body 130 to a drill chuck threaded fitting 132.

10 The body 130 is provided with an angular angled member 134 i: which may be a disc as shown or a ball race fitted to the periphery of the body 130. The angled member 134 engages with the resilient rollers 72 mounted on the pegs 66 as can be seen in Figures 1 and 2.

15 Operation of the drill chuck causes rotation of the body 0* 130 and corresponding rotation of the angled member 134.

The rotation of the angled member 134 causes the pegs 66 to rcoo move reciprocably in linear manner and to transmit this linear, reciprocal motion to the shuttle 64. The nibbler 20 blade 107 is thus caused to move in corresponding linear reciprocal manner.

The barrel 58 is reversible such that upon removal from the clamp 16, the clamp may be replaced in the opposite orientations to that shown in Figures 1 and 2. In this connection, the end 80 is arranged to receive a jig saw or other knife blade tool. The jig saw or other knife bladed tool may be fitted to the shuttle 64 in the same manner as the nibbler blade 107 described above with the shuttle 64 being reversed.

-11- In Figure 6A there is shown a side elevation of a nibbler blade such as the blade 107 described above.

In Figure 6B there is shown a side elevation of a jig saw blade which may replace the blade 107.

In Figure 6C there is shown a side elevation of a diamond edged blade which may replace the blade 107.

In Figure 6D there is shown a side elevation of a knife edged cutter which may replace the blade 107.

In Figure 6E there is shown in tungsten carbide tipped blade which may replace the blade 107.

In Figure SF there is shown a narrow and thin cutter blade for cutting analysis which may replace the blade 107.

In order to use the blades of Figures 6B to 6F the barrel 58 is reversed as described above and one of the 15 alternative blades fitted to the end 80. A plastics material nose member 150 shown in Figures 7 and 8 comprises a hollow cylindrical portion 152 connected to an annular flange 154. The flange 154 may be provided with a V-shaped cut out 156 for better sighting of the blade in use. The 20 flange 154 contains an aperture 157 into which is fitted a short rod guide 158.

A set screw 160 is arranged to be threadedly engaged with the aperture 157 to retain the guide 158 in place and to adjust its position such that it supports the cutting blade.

In use, the nose member 150 fits over the end 80 of the barrel 58 by means of engagement of the cylindrical member with the barrel 58. The guide 158 supports the cutting blade in use. The cutting blade is moved in linear 12 reciprocal manner in the same way that the nibbler blade 107 is moved as described above. The nose member 150 may be located on the barrel 58 by a knurled headed screw 162 engaging with a threaded aperture 164 in the cylindrical member 152 and a dimple in the barrel 58.

The disc 134 may have a plastics or metal safety cover 170 as shown in Figure 9. The cover 170 contains a slot 172 to enable the shuttle 64 to operate and two cut away portions 174 to allow the cover 170 to fit over the clamp 16. As S. 10 can be seen in Figures 1 and 2, the clamp 16 has a pair of

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knurled headed screws 176 attached to opposed sides thereof. The screws 176 are arranged to engage with S"corresponding holes 178 in the cover 170.

In Figure 10 there is shown a plastics material patch 180 15 having a curved peripheral member 182 defining a cavity 184. A cover 185 is placed over the cavity 184.

A pipe 186 is in communication with the cavity 184 through the member 182. A flexible tube 188 is arranged to be connected to an outer end of the pipe 186. The tube 188 is S 20 coupled to the nose portion 150 of Figure 7 and 8 at a hole 190 extending through the flange 154.

The peripheral member 182 is arranged to be adhered to the body of the drill 12 over a cooling slot so that air leaves the body of the drill and is channelled through the pipe 186 and the tube 188 to the tube 190 at which a jet of air passes over the cutting blade and blows away chips being ejected from the work.

In Figure 11 there is shown an angled cutter attachment 200 which could replace the nose portion 150. The attachment 13 200 could pivot on a base 202 through which the blade passes. The attachment 200 and the base 202 can be pivotally coupled together by an convenient means apd be provided with protracta means for angles and a loading device.

In operation of the nibbler bade embodiment of the present invention, the foot 124 enables the nibbler tool to cut shaped material such as corrugated iron. In this connection, the forward faces of the block 100, the wear plate 98, and the lower portion of the end 78 are preferably sloped away from the foot 124 as can best be seen in Figure i. As shown in Figure 20, the angle "A" ego.oi S"enables the rod 10 to cut other than flat material.

The longitudinal position of the foot 124 relatively to the 15 end 78 can be readily adjusted as discussed above to suit different configurations of shaped material. The foot blade 122 simply follows the nibbler blade 107 through the cut in the work. Further, if desired, the foot 124 can be removed altogether and cutting done over a foam pad or the 20 edge of a table. As shown in Figure 18, the foot 124 can be relatively close to the end 78 for cutting of corrugated material but is preferably disposed further away from the end 78 for cutting of angular material as shown in Figure 19.

The shuttle 64 can take many forms, for example, it could be a machined forging as used on sewing machines.

Alternatively,, the nibbler blade 107 could be formed integrally with downwardly projecting members as described in Australian Patent No. 460299.

14 I Also, the flat nibbler blade 107 could be replaced by a round blade.

Figure 12 shows a nibbler blade 250 which is round in cross-section and which cuts on the upstroke.

In Figures 13 and 14 there is shown an anvil 252 which has a round hole 254 in a forepart 256. The anvil 252 is cross slotted at 258 to allow chips to clear. The anvil 252 has an enlarged hole at 260 to fit the barrel 58. A screw at 262 attaches the anvil 252 to the barrel 58. The anvil 252 5 is adapted at its forepart /56 to take the same foot assembly as described above.

The small diamer round nibbler blade 250 is' waisted at 264 where the cutting is done. At the other end the nibbler blade 250 is enlarged and threaded to fit the shuttle 64.

15 Figure 15 shows an asbestos sheet/fibre glass sheet cuzting blade and Figures 16 and 17 a cutting head. The blade 300 in Figure 15 has a tungsten carbide insert 302 and is notched at 304. Cutting head 306 can be of mild steel.

The cutting head 306 is cross slrtted at its forepart 308 and fitted with a tungsten carbide insert which can be clamped or silver soldered in place. The cutting blade 300 slides in a vertical slot 310, the blade 300 being guided and restricted in vertical movement by the interior of a barrel 312 and the bottom interior of a hole 314 which accepts the adjacent end of the barrel 312. The blade 300 is made deeper than other blades for its intended purpose.

However, it is reduced in width where it fits the shuttle 64 as can be seen in Figure 15. The cutting head 306 is cross slotted at 316 to clear chips. Because these chips 15 are larger, extra clearance holes are made 318 and 320.

Modifications and variations such as would be apparent to a skilled addressee are deemed within the scope of thp present invention. For example, other blade fixing methods may be used. The shuttle body could be slotted with the slot terminating in a wedge, and a wedge shaped slot fitted to the end of the blade with a shouldered screw to hold the blade.

Further, the plates 126 of the foot 124 could be so mounted 0 as to be angularly adjustable. For example, the outer end °0o of the foot blade 122 could contain an aperture with radial e grooves disposed about it. Correspondingly the blade "i plates 126 could contain corresponding radial projections arranged to engage with the radial grooves in different 15 positions of the plates 126. For cutting flat sheets, the plate 126 could be orientated at 900 to the blade 122. For cutting corrugated materials as shown in Figure 18, the plates 126 could be disposed at about 600 to the foot blade 122. For cutting sharp angled material as shown in Figure 20 19, the plates 126 could be disposed at about 450 to the o foot blade 122. Simultaneously with variation of the angle of the plates 126 the longitudinal position of the plates 126 could be varied so that the greater the angle of the material being cut, the more the foot 1245 is preferably extending away from the end 78 to enable the foot 10 to negotiate the sharper angles as shown in Figures 18 and 19.

The angularly adjustable foot could be releasably attached to the blade 122 by means of a clamp screw engaging with a threaded aperture in the blade 122.

Claims (8)

1. A cutting tool comprising a housing having mounted therein a cutting blade, means being provided for moving the cutting blade in a reciprocal, linear manner, wherein there is provided a longitudinally adjustable foot which is mounted to the housing but sp.-,ed therefrom by a foot blade, the foot being located adjacent the cutting blade on one or both sides thereof, and the foot blade being disposed in alignment with the cutting blade and being so 1 0 configured as to pass through a cut in a workpiece formed by the cutting blade.

2. A cutting tool according to claim i, in which the S- cutting blade is a flat blade and the foot blade is also a flat blade. 15

3. A cutting tool according to claim 1 or 2, in which the foot comprises a pair of plates disposed on opposite sides of the cutting blade.

4. A cutting tool according to any one of the preceding i claims, in which the foot blade fits into a slot in a block 20 of the housing and is of greater depth than the slot such that when the blade is tightened into position the foot blade is clamped so as to retain it in a desired position.

A cutting tool according to any one of the preceding claims, in which the cutting blade is a nibbler blade provided with a recess on an edge thereof, which recessed has an exposed forward corner which emerges from the housing on a forward stroke of the cutting blade and, upon returning towards the housing on a return stroke of the cutting blade, effects a cutting action on a workpiece. 17 1

6. A cutting tool according to any one of the preceding claims in which the housing comprises a removeable barrel in which the cutting blade is mounted adjacent a first end thereof.

7. A cutting tool according to claim 6, in which the removable barrel is reversible and is arranged to have alternative cutting blades mounted to a second end thereof for reciprocal linear movement.

8. A cutting tool substantially as hereinbefore described 10 with reference to any one of the accompanying drawings. 4 *444 *SALAZAR HOLDINGS PTY LTD By their Patent Attorneys 4 KELVIN LORD AND COMPANY PERTH, WESTERN AUSTRALIA i e 18 ABSTRACT A cutting tool (10) such as a nibbler tool having a cutting blade (107). The cutting blade (107) moves in a reciprocable linear manner in use. The cutting tool is also provided with a longitudinally adjustable foot (124) mounted on a foot blade (122). The foot blade (122) is aligned with the cutting blade (107) and is configured to pass through a cut in a workpiece formed by the cutting blade. The tool is particularly envisaged for cutting 10 corrugated and angular workpieces. oo S. 20 eO