AUSTRALIA PATENTS ACT 1990 INNOVATION PATENT Name and Address of Applicant: Mr Scott Frear 21 / 7 Peach Tree Road MACQUARIE PARK NSW 2113 Actual Inventor[s]: Scott Frear Address for Service: 1 PLACE PATENT ATTORNEYs+ SOLICITORS Suite 404 / 107 Walker St NORTH SYDNEY NSW 2060 FOR THE INVENTION ENTITLED: Double Bevel Circular Saw Device, Method and System The following statement is a full description of this invention, including the best method of performing it known to me/us: 5 INTRODUCTION The present invention relates to a handheld circular saw and in particular to a hand-held circular saw that has a cutting blade which tilts relative to it's base plate. 10 COPYRIGHT NOTICE This document subject to copyright. The reproduction, communication and distribution of this document is not permitted without prior consent from the copyright owner, other than as permitted under section 226 of the Patents Act 15 1990. BACKGROUND Handheld circular saws are generally known in the prior art; however, limitations 20 of handling all cutting angles with circular saws have not been overcome due to limitations in the circular saw's construction. Handheld circular saws are portable (an advantage over table saws), are relatively manoeuverable and are not bound to the object being cut (an advantage over 25 miter and drop saws). Further, handheld circular saws are powerful (an advantage over jigsaws) and able to be set to cut at specific angles for performing inclined (acute) angles or bevel cuts. The limitation with handheld circular saws is that the specific angle that they are 30 able to cut is generally limited to acute angles only: the saw blade is able to tilt relative to the base plate so that it is able to cut an acute angle, although, the same movement is not available to cut obtuse angles. Therefore, it is only possible to fully tilt the saw blade relative to the base plate in one direction: that is, that the saw blade is able to move from substantially the perpendicular to the base plate to 35 substantially a small acute angle at one side of the base plate only. That is, the blade on handheld circular saw is not able to move to a small acute angle on the other side of the base plate. Consequently, there is movement predominantly in only one right angle (or sector), between the base plate and the saw blade. 2 5 This limitation of movement of the saw blade, relative to the base plate, creates limitations for the operator to fully manoeuvre the saw blade relative to the base plate. Consequently, the inclination adjustment of the saw blade relative to the base plate benefits manoeuvrability for dominance in one sector of cutting angles only and is a detriment when the operator has to cut acute angles in the adjacent 10 right angle. To more clearly articulate this problem, the operator's starting position of their handheld circular saw has the cutting blade perpendicular to the base plate. The angle of the cutting blade to the base plate is able to move to an acute angle only 15 on one side of the cutting blade, since movement of the cutting blade to the base plate on the other side is limited because the cutting saw's motor, which sits between the handle and the base plate on one side and stops the full range of movement between the cutting blade and the base plate to be a fulfilled. 20 Hand-held circular cutting saws require rotation of the saw blade to move forward and therefore the feed direction of the saw blade is limited if the blade can only have an inclination substantially in one right angle over the adjacent right angle to be full manoeuvrability in the near 1800 of the blade relative to the base plate. 25 The reason for not having for movement in both directions is that the motor and other apparatus such as the dust vacuum that is seated between the handle and the base plate limit full inclination of the blade and the base plate in all directions. Consequently, the operator of the blade needs to reposition themselves from the opposite direction to allow a full cutting angle in the other sector. This is very time 30 consuming for an operator to reposition themselves and somewhat dangerous because the cut is not continuous with the cut from the previous end. Therefore performing a counter cut to run from the opposite end is problematic. To overcome this problem there needs to be movement of the saw blade, relative 35 to the base plate, in both acute and obtuse angles with full manoeuvrability in both the forward and backward inclination to the base plate. 3 5 Full manoeuvrability is known in table saws; however, it is not available in hand saws. Table saws do not have the flexibility to take the saw to the timber and therefore a limited in their field of use. Other saws such as jigsaws have this flexibility however they do not have the power, accuracy or stability relative to 10 handheld circular saws. Commonly, to overcome the lack of manoeuvrability with the angles of table saw cutting, operators have been known to use a hand-held circular saw like a chainsaw where the blade is held in a higher position such that the object being cut does not meet with the base plate. This misuse of a handheld circular saw is a dangerous practice which results in the jumping of the saw and 15 damage to the object being sawn. To stop this practice, and to provide suitable protection for the operator handheld circular saws have a swinging protective covers over the blade which is pushed back when the base plate travels along the object to be cut. Therefore, unless the base plate is adjacent to the object being cut and push forward, the cutting blade will not be exposed. 20 It is an object of the present invention to provide a handheld double bevel circular saw device, method and system with a full range of movement between the cutting blade and the base plate such that the operator is able to execute an acute or an obtuse angle without the limitation in current handheld circular saws. 25 4 5 SUMMARY OF THE INVENTION It is an object of the present invention to provide a handheld double bevel circular saw device, method and system with a full range of movement between the cutting blade and the base plate such that the operator is able to execute an acute 10 or an obtuse angle without the limitation in current handheld circular saws. According to an aspect of the invention there is provided a handheld circular saw, comprising: a) a saw blade that rotates around a turning axle; 15 b) saw housing enclosing substantially one hemisphere of said saw blade; c) motor housing connected to said saw housing, proximal to said base plate, which accommodates a motor to rotate said axle to drive said saw blade; 20 d) a base plate supported indirectly via said saw housing; wherein said base plate is adjustable relative to said saw blade to enable said base plate to be: a. rotatable; and b. raised or lowered; 25 such that said saw blade is enabled to saw in an acute or an obtuse range of cutting angles as formed by said base plate and said saw blade when said saw blade travels in one cutting direction. 30 The invention thus provides a handheld double bevel circular saw device, method and system that overcome the limitations of single bevel circular saws by providing the means to substantially tilt the saw blade to form both acute and obtuse angles relative to the base plate. 5 5 For a better understanding of the invention and to show how it may be performed, a preferred embodiment will now be described, by way of non-limiting example only, with reference to the accompanying drawings. 10 BRIEF DESCRIPTION OF THE DRAWINGS A preferred embodiment of the invention will now be described, by way of example only, with reference to the accompanying drawings in which: 15 FIGURE 1 is perspective view of the handheld double bevel circular saw according to a preferred embodiment; FIGURE 2 shows a front view of the handheld double bevel circular saw with the saw blade in the perpendicular position relative to the base plate according to a 20 preferred embodiment; FIGURE 3 shows a front view of the handheld double bevel circular saw with the saw blade in an acute position relative to the base plate according to a preferred embodiment; 25 FIGURE 4 shows a front view of the handheld double bevel circular saw with the saw blade in in an obtuse relative to the base plate according to a preferred embodiment; 30 FIGURE 5 shows a plan view of the handheld double bevel circular saw according to a preferred embodiment. 6 5 Detailed description of a preferred embodiment The invention provides a new or alternative handheld double bevel circular saw device, method and system for use. 10 The handheld double bevel circular saw described herein provides a new or alternative circular saw having the means to substantially tilt the saw blade to form both acute and obtuse angles relative to the base plate. A preferred embodiment of the present invention will now be described by way of 15 non-limiting example only, with reference to the accompanying drawings. The following detailed description in conjunction with the figures provides the skilled addressee with an understanding of the invention. It will be appreciated, however, that the invention is not limited to the applications described below. 20 Preferred embodiments The figures illustrate a handheld double bevel circular saw. Referring to Figure 1, the preferred embodiment of the handheld double bevel circular saw 10 (hereafter handheld circular saw) which rotates around a turning axle (not shown). This handheld circular saw has a base plate 20 with an internal cut out surrounding the 25 saw blade 60. The base plate 20 has a protractor in the form of a blade angle adjuster 50 attached for movement of the base plate in either direction at 46 - 0 46 degrees. The blade angle adjuster 50 is connected to base plate 20 at the front and the back of saw blade housing 90 which substantially encloses one hemisphere of the saw 30 blade. The saw blade housing 90 and base plate 20 of the saw are joined together and are rotatably adjustable relative to each other so that the saw blade housing 90 and the saw blade 30 can collectively tilt relative to the base plate 20. This base plate 20 is supported by said saw housing 90 such that the base plate 20 is enabled to rotate from the perpendicular to an acute or an obtuse angle relative to the saw 35 blade 50. This enables the base plate 20 to be rotatably displaceable relative to the saw blade 60. 7 5 The saw blade housing 90 connects to, or alternatively includes in other arrangements, handles 75, 82, 85 which may include a control handle 75 and a stabilisation handle 85 which connects to the motor housing 100, which in turn, connects to said saw housing 90 and indirectly said saw blade angle adjuster 50. This connection of said saw blade housing 90 and said motor housing 100 takes 10 place proximal to said base plate 20 such that said saw blade housing 90 and said motor housing 100 form an acute angle with their most separate regions connected via a control handle 75. This allows the saw housing/blade/handles and motor to be tilted, relative to the base plate, for allowance of movement about an axis parallel to the axis of the saw blade so the saw blade is enabled to be titled to 15 the left or right. This limits the motor housing 100 from being an obstacle when moving the saw blade 60 from an acute to an obtuse angle. For manufacturing efficiency, the base plate 20 is rotatably fixed to the saw housing 90 via a blade angle adjuster 50 adjusting, in one embodiment, via a U 20 shaped bracket (not shown). The bracket is attached at base of the blade angle adjuster 50 via, in another embodiment, using a permanently fixing means such as a pop rivet (not shown). It is also envisaged that a threaded bolt (not shown) passes through front of the blade angle adjuster 50 to enable adjustment of the base plate relative to the saw blade and housing. This threaded bolt is attached via 25 wing nut (not shown) which allows the saw blade 60 and the housing 90 to be securely, reversibly and rotatably tilted. The wing nut (not shown) can be loosened and then tightened when desired angle of the saw blade has been established, so that there is a lock position and a release position for adjustment of the blade angle. 30 Depth adjustment of the saw blade is enabled by lowering or raising means (not shown) to adjust the height of the base plate 20 relative to the housing/blade/handles and motor so that the saw blade 60 is enabled to be moved up or down. 35 A saw housing/blade/handles positioning being rotatably independent of the base plate, enables the angle of the saw blade with respect to the base plate to be fixed 8 5 at selected angles and heights. Means at one side of the base plate are optionally included for adjusting the saw blade position. The motor housing 100 has allowances for handle attachments 70 and other attachments such as a control arm 75 intermediary between the motor housing 100 has allowances for handle attachments 70. This enables the saw blade to be 10 steered and rotating and moved horizontally as the user places force on the handle and control arm. The motor housing 100 is, in one embodiment, constructed of hollow member 80 which comes off side of the saw housing 90 at 45 degree angle. This hollow member 80 allows the motor housing 100 to be attached by, in another 15 embodiment, screws at each corner. The hollow member 80 allows the notched end of the motor (the end of the motor indirectly connected to drive the saw blade) to attach to notch blade arm spindle (which rotates blade). The saw housing (on opposite side to motor and housing) at has an outlet 85 to allow timber saw dust/chips to flow out. There are embodiments with a bag 20 attachment such as a vacuum attachment to collect such saw dust. The saw housing is fully enclosed opposite motor side to approximately, in a further embodiment, 20mm higher than center of blade to allow access to the saw blade, so as to allow the user access to perform tasks such as tightening the blade. The motor is located in the motor housing 100 at a 45 degree angle off the side of 25 saw housing 90. The end of motor arm is notched to an arm in which the blade is attached and suspended in the hollow member 80 via a notch spindle (not shown). The notched end of motor arm interlocks with fixed notch spindle arm (not shown) in hollow member 80. This allows the blade to rotate. Power is sourced from power lead, which is attached at base of control handle (not 30 shown). The wiring runs through the handle up to the actuator (not shown) at top of handle (not shown). The wiring continues from actuator through second handle into motor. The handle 70, in one embodiment, is approximately 25-30mm thick all round and is made of plastic and is hollow to allow wiring to travel through it. The handle 70 9 5 is attached to both the saw housing 80 and motor housing 100 to allow stability of the saw and therefore greater control. There are various attachments that are able to be attached to the handheld double bevel circular saw such as the ripping guide, which has two arms. As shown in Fig 1 there is a ripping guide 40 is positioned parallel to the side of the base plate 20. 10 The ripping guide contains a guide piece 40 slidably engaged by ripping rails 28 (Fig 5) to the base plate 25 so that the ripping rails are enabled to be anchoured in place by a lock handle 30, 80 which can be loosened or tightened to allow the guide piece 40 to be adjusted relative to the base plate 25. The rear blade angle adjuster 50 also has a fixing means such as a threaded bolt 15 that is fixedly attached so as to provide a bevel angle locking means when tightened via fixing mechanism such as a wing nut. This fixing mechanism when loosened and re-tightened in conjunction, allows the blade, blade housing, handle(s), motor and housing to be tilted either way of 0 degrees - that is, the saw blade tilted acutely or obtusely of the base plate's perpendicular positioning. 20 The above embodiments have advantages over conventional handheld circular saws, in that base plate blade angle adjuster 50 allows saw blade to be adjusted to 46 degrees EITHER way to the blade angle adjuster 50 being perpendicular to the saw blade 60. This allows operator to stay in one position whilst they are cutting. It also allows less material handling as the material undergoing cutting does not need 25 to moved and/or realigned. This allows access of both acute and obtuse angles to be cut within the material without realigning the saw. The preferred embodiments therefore provide a number of cost and time-saving advantages, including one or more of the following: 30 (a) eliminating the need re-aligning of the saw to cut an obtuse angle after cutting an acute angle; (b) allowing the positioning of the motor and housing at a 46 degree angle which allows the saw to be tilted to required angle without a restricted operation. 10 5 (c) allowing the positioning of the motor to allow greater vision by the user whilst cutting, (d) allowing the positioning of the handle for greater control of the saw whilst operating in any position, (e) allowing the positioning of the second handle, when used, allows more 10 comfortable control off saw; (f) allowing the positioning of the wires to connect the power , actuator and motor together, (g) allowing the positioning of the saw dust outlet/collector to manage waste while cutting in a more controlled fashion. 15 (h) allowing the positioning of attachments i.e. dust bag or vacuum cleaner without hindering cutting (depending on positioning of saw). (i) allowing the positioning of attachments such as the ripping guide, which has two arms. One positioned at front of base plate, while the other is positioned out back. They are attached by actual guide. 20 Although the invention has been described with reference to specific examples, it will be appreciated by those skilled in the art that the invention may be embodied in many different other forms. 25 Dated this 27 September 2010 Applicant's Name: Scott Frear 30 By 1 Place Patent Attorneys + Solicitors Patent Attorneys for the Applicant 11