A circular saw including a transparent window extending within an opening of a saw blade guard and covering a fastening structure

Abstract

A circular saw having a transparent window extending within a saw blade guard opening and a cover fastening structure. The circular saw includes a motor and an arbor configured to operably attach a circular saw blade to the circular saw. The circular saw also includes a saw blade guard. The saw blade guard includes a saw blade guard opening positioned to allow a user of the circular saw to view a leading edge of the circular saw blade when the circular saw is cutting a workpiece. The circular saw further includes a transparent window extending within the saw blade guard opening and a cover fastening structure configured to selectively attach a debris guard to the saw blade guard when the transparent window extends within the saw blade guard opening.

Description

[0001] Related applications

[0002] This application claims priority to U.S. Provisional Patent Application No. 63 / 044,034, filed June 25, 2020, the entire disclosure of which is incorporated herein by reference. Technical Field

[0003] This disclosure generally relates to a circular saw with a transparent window that extends within an opening of a saw blade protection device and covers a fastening structure. Background Technology

[0004] Circular saws use a rotating circular saw blade to cut workpieces. The rotating circular saw blade can be dangerous. Therefore, conventional circular saws typically include a blade guard that at least partially covers the rotating circular saw blade. In some cases, it may be desirable to allow the user to observe the leading edge of the circular saw blade while the circular saw is cutting a workpiece, so that the end of the cut formed by the circular saw blade within the workpiece allows and / or facilitates the desired and / or correct positioning. Some conventional circular saws may have at least partially exposed circular saw blades, which allow this observation. While effectively allowing the user to observe the circular saw blade, at least partially exposed circular saw blades can pose safety hazards. More specifically, the exposed area of ​​the circular saw blade may come into contact with a user or foreign object, resulting in injury and / or damage. To mitigate this risk, some conventional circular saws include a removable cover that can be used to selectively cover the exposed area of ​​the circular saw blade. While the installation of a removable cover reduces the risk of injury and / or damage, the removable cover also obstructs the user's observation of the leading edge of the circular saw blade and must be removed to make such observation possible. To mitigate this risk, the aforementioned risks remain even when the removable cover is removed. Some conventional circular saws include ribs and / or fingers that protrude from the blade protector and are configured to reduce the likelihood of contact between the user and the rotating circular saw blade. While such ribs and / or fingers may be effective at least to some extent, their presence reduces the clearance between the blade protector and the circular saw blade, which can make it difficult to remove and / or install the blade and / or may reduce dust collection efficiency within the circular saw. Therefore, there is a need for improved circular saw designs that include blade protectors with transparent windows and cover fastening mechanisms. Summary of the Invention

[0005] A circular saw with a transparent window extending within a saw blade protection opening and covering a fastening structure. The circular saw includes a motor with a motor shaft configured to rotate about an axis of rotation. The circular saw also includes a spindle configured to operatively attach a circular saw blade to the saw, and to cause the circular saw blade to rotate about the spindle axis of rotation when the spindle receives torque from the motor via rotation of the motor shaft about the axis of rotation. The circular saw also includes a saw blade protection opening positioned to allow a user of the circular saw to observe the leading edge of the saw blade while the circular saw is cutting a workpiece. The circular saw also includes a transparent window extending within the saw blade protection opening, and a covering fastening structure configured to selectively attach a debris protector to the saw blade protection when the transparent window extends within the saw blade protection opening. Attached Figure Description

[0006] Figure 1 This is a schematic diagram of an example of a circular saw according to this disclosure.

[0007] Figure 2 This is a non-simplified top outline view of an example of a circular saw according to this disclosure.

[0008] Figure 3 This is a non-simplified right-side view of an example of a circular saw according to this disclosure.

[0009] Figure 4 This is a non-simplified left-side view of an example of a circular saw according to this disclosure.

[0010] Figure 5 This is another non-simplified left-side view of an example of a circular saw according to this disclosure.

[0011] Figure 6 This is another non-simplified left-side view of an example of a circular saw according to this disclosure.

[0012] Figure 7 This is a non-simplified front view of an example of a circular saw according to this disclosure.

[0013] Figure 8 This is a non-simplified rear view of an example of a circular saw according to this disclosure.

[0014] Figure 9 This is a non-simplified top view of an example of a circular saw according to this disclosure.

[0015] Figure 10 This is a non-simplified bottom view of an example of a circular saw according to this disclosure.

[0016] Figure 11 It is along Figure 3 The line 11-11 cut Figure 2-10 A non-simplified cross-sectional view of a circular saw.

[0017] Figure 12 This is a non-reduction illustration of an example of an opaque covering according to this disclosure.

[0018] Figure 13 yes Figure 12 Another non-simplistic illustration of an opaque covering.

[0019] Figure 14 This is a non-simplified illustration of an example of a transparent window according to this disclosure.

[0020] Figure 15 yes Figure 14 Another non-simplified illustration of a transparent window.

[0021] Figure 16 This is a non-simplified right-side view of an example of a circular saw according to this disclosure.

[0022] Figure 17 It is along Figure 16 The line 17-17 was cut off Figure 2-16 A non-simplified cross-sectional view of a circular saw.

[0023] Figure 18 yes Figure 2-17 An exploded view of a portion of a circular saw. Detailed Implementation

[0024] Figure 1-18 Examples of circular saw 10 and / or components of circular saw 10 according to this disclosure are provided. Elements for similar or at least substantially similar purposes are also provided. Figure 1-18 Each figure in the document is labeled with the same reference numerals, and these elements may be disregarded herein. Figure 1-18 Each image in the document is discussed in detail. Similarly, it is not necessary to... Figure 1-18 All elements are labeled in each figure in this document; however, for consistency, the associated figure labels may be used throughout this document. References Figure 1-18 The original, component, or feature described in one or more diagrams can be included. Figure 1-18 Any one of the pictures and / or with Figure 1-18 any one Figure 1 Use it without departing from the scope of this disclosure.

[0025] Typically, elements that may be included in a particular embodiment are shown in solid lines, while optional elements are shown in dashed lines. However, elements shown in solid lines may not be necessary for all embodiments, and in some embodiments may be omitted without departing from the scope of this disclosure.

[0026] Figure 1 This is a schematic diagram of an example of the circular saw 10 according to this disclosure, and Figure 2-10 This is a non-simplified illustration of an example of the circular saw 10 according to this disclosure. More specifically, Figure 2 This is a non-simplified top outline drawing of an example of the circular saw 10 according to this disclosure. Figure 3 This is a non-simplified right-side view of the circular saw 10, and Figure 4 This is a non-simplified left-side view of the circular saw 10. Furthermore, Figure 5 This is another non-simplified left-side view of the circular saw 10, and... Figure 6 This is another non-simplified left-side view of the circular saw 10. Figure 7 This is a non-simplified front view of the circular saw 10. Figure 8 This is a non-simplified rear view of the circular saw 10. Figure 9 This is a non-simplified top view of the circular saw 10, and... Figure 10 This is a non-simplified bottom view of the circular saw 10.

[0027] As by Figure 1-10 As generally shown, the circular saw 10 includes a motor 90, which includes a motor shaft 92 configured to rotate about an axis of rotation 94. The circular saw 10 also includes a spindle 100 configured to operatively attach a circular saw blade 200 to the circular saw, and to cause the circular saw blade to rotate in a plane of blade rotation and / or about an axis of rotation 106 of the spindle when the spindle receives torque from the motor 90, such as when the motor shaft 92 rotates about the axis of rotation. Figure 1 The dashed lines in the middle and Figure 3-8 as well as Figure 10 As shown by the solid lines, the circular saw 10 may also include a circular saw blade 200. The circular saw blade 200 (when present) may be operably attached to the circular saw via a spindle 100 and / or may be configured to rotate with the spindle as the spindle rotates about its axis of rotation 106. Rotation of the circular saw blade 200 facilitates cutting of the workpiece 98 with the circular saw blade, such as... Figure 1 As illustrated schematically.

[0028] The circular saw 10 also includes a blade guard 80. The blade guard 80 includes a blade guard opening 800. The blade guard opening 800 is adapted, configured, shaped, sized, and / or positioned to allow the user of the circular saw to observe the leading edge 228 of the circular saw blade while the circular saw is cutting a workpiece. The circular saw 10 and / or its blade guard 80 also include a cover 804 in the form of a transparent window 808. The transparent window 808 covers the blade guard opening 800.

[0029] During the operation of the circular saw 10, the circular saw blade 200 can rotate around the spindle rotation axis 106. Simultaneously, the circular saw blade can engage with the workpiece 98 to cut the workpiece, such as... Figure 1 As may be best shown in the diagram. During the cutting of workpiece 98 using the circular saw 10, the user can observe the leading edge 228 of the circular saw blade 200 via and / or through the transparent window 808.

[0030] This configuration can provide significant advantages over conventional circular saws that do not include the transparent window 808. For example, the transparent window can protect a user or another object from contact (including unintentional contact) with the rotating circular saw blade, thereby reducing the likelihood of injury to the user and / or damage to another object compared to a conventional circular saw. In other words, the transparent window 808 can define a physical barrier that prevents access to and / or contact with the circular saw blade via the saw blade protection opening 800, while still allowing the user to observe the leading edge 228 of the circular saw blade 200.

[0031] As another example, a conventional circular saw excluding the transparent window 808 may include, or may require, ribs and / or fingers projecting from its blade guard and / or toward its circular saw blade to reduce the likelihood or gap between the user and the rotating circular saw blade. Such ribs and / or fingers reduce the efficiency of dust and / or debris collection in a conventional circular saw compared to the circular saw 10 according to this disclosure. More specifically, according to this disclosure, the absence of ribs and / or fingers within the circular saw 10 reduces airflow resistance between the leading edge 228 and the vacuum port 86 of the circular saw 10. The vacuum port 86 may be configured to engage a vacuum to allow and / or facilitate the collection of debris generated when the circular saw is used to cut a workpiece, and the reduction in airflow resistance increases the efficiency of debris collection. Alternatively or additionally, the presence of the transparent window 808 may allow the circular saw 10 to establish a higher level of vacuum within the blade guard 80 compared to a conventional circular saw, thereby further improving the efficiency of dust collection.

[0032] The circular saw 10 may include any suitable type or style of circular saw adapted, configured, designed, and / or constructed to cut workpiece 98 using the circular saw blade 200. Examples of the circular saw 10 include a handheld circular saw 12, a radial arm saw 16, an insert saw 30, a track saw 40, and / or a bevel saw 50, such as... Figure 1As schematically illustrated herein. In some examples, the circular saw 10 may include structures and / or features from two or more of the aforementioned saws, and / or may incorporate the functionality of two or more of the aforementioned saws. As an example, and as discussed in more detail herein, a given circular saw 10 may be and / or may incorporate the functionality of a handheld circular saw 12, an insert saw 30, a rail saw 40, and / or a bevel saw 50. Therefore, the circular saw 10 according to this disclosure may include one or more features disclosed herein, but the circular saw 10 need not include all the features disclosed herein.

[0033] Motor 90 may include any suitable structure that can provide prime mover power for the rotation of motor shaft 92 and / or for the actuation of circular saw blade 200. Examples of motor 90 include electric motors, AC electric motors, DC electric motors, brushless DC motors, variable speed motors, and / or single speed motors.

[0034] like Figure 1 The dashed lines in the middle and Figure 2 , Figure 4-6 and Figure 8-9 As shown by the solid lines, the circular saw 10 may include a gripping area 60, which is configured to be gripped and / or held by a user during operation of the circular saw. The gripping area 60 (when present) may also be referred to herein as and / or may be a handle or grip.

[0035] For example Figure 1 The dashed lines in the middle and Figure 2 and Figure 4-6 As shown by the solid lines, the circular saw 10 may include at least one switch 65. Switch 65 (when present) can be configured to be selectively actuated by a user of the circular saw to enable and / or allow the supply of current to at least one other component of the circular saw and / or allow power operation of at least one other component of the circular saw. As an example, selective actuation of switch 65 can be used to operate the motor controller of the circular saw to selectively apply current to the motor 90, enabling the motor controller to selectively apply current to the motor and / or allow or direct the motor to provide prime mover power for the rotation of the motor shaft.

[0036] In some examples, the current can be used to power at least one other component of the circular saw 10 (such as motor 90) or directly power it. In some such examples, the current may also be referred to herein as an electrical power signal. In some examples, the current can be an electrical data signal sent to at least one other component of the circular saw (such as the motor controller of the circular saw). In some such examples, the current may also be referred to herein as a data signal and / or as an electrical data signal. Examples of switch 65 include an electric switch, a normally open electric switch, a momentary electric switch, and / or a locked momentary electric switch.

[0037] For example Figure 1 The dashed lines in the middle and Figure 2-10 As shown by the solid lines, the circular saw 10 may include a workpiece support 300. The workpiece support 300 (when present) may be configured to support the workpiece 98 and / or position the circular saw and the workpiece relative to each other when the workpiece is cut by the tool or otherwise acted upon. For example, many circular saws 10 in the form of a saw include a workpiece support 300 in the form of a base plate, table, shoe, frame, or pad.

[0038] The circular saw 10 may include any suitable power source and corresponding power structure for powering the motor 90. Examples of power structures include a power supply structure 70, a power cable 72, and / or a battery 74, such as... Figure 1 As shown in the image.

[0039] In some examples, and as discussed, the circular saw 10 may include or may be an insert saw 30. In examples where the circular saw 10 is or includes an insert saw 30, the spindle 100 may be configured to move relative to the workpiece support 300 to selectively change the area 320 of the circular saw blade 200 protruding from the workpiece support and / or selectively change the cutting depth of the circular saw, such as... Figure 1 , Figure 3-4 and Figure 7-8 As shown in the diagram. For example, the mandrel 100 can be configured to pivot relative to the workpiece support 300, as illustrated in, for example, by means of, in, such as Figure 1 , Figure 3-4 and Figure 7-8 The insertion positioning 52 shown and such as Figure 5-6 The transition between the retraction positions 54 shown in the figure is illustrated.

[0040] As a more specific example, the workpiece support 300 may include and / or a base plate 304 defining a mandrel-facing side 308 and a mandrel-opposite side 312, to which the mandrel 100 may be operatively attached via, through, and / or using a base plate pivot 316 to the mandrel-facing side 308 of the base plate 304. The mandrel is operatively attached to the base plate such that the mandrel-facing side 308 faces the mandrel. In such an example, the mandrel 100 and the base plate 304 may be configured to rotate relative to each other about the base plate pivot 316 in order to selectively change the region 320 of the circular saw blade 200 extending on the mandrel-opposite side 312 of the base plate 304.

[0041] In other words, the spindle 100 can be configured to pivot relative to the workpiece support 300 over a full range of relative positioning or relative angles, which can be defined by fully inserted positioning and fully retracted positioning. For each relative positioning within this range, the circular saw blade 200 can extend a corresponding amount on the opposite side 312 of the spindle, thereby providing a corresponding cutting depth for the circular saw.

[0042] In some examples, and as discussed, the circular saw 10 may include and / or a rail saw 40. In examples of the circular saw 10 that is or includes a rail saw 40, the substrate 304 may include a rib receiving channel 324, which may be configured to receive the raised elongated ribs 44 of the rail 42, as is possible. Figure 1 As best illustrated herein. The track 42 may also be referred to herein as an elongated track 42 and may be formed of one or more elongated track segments or track sections 46, which are operably connected to each other to define an appropriate track length. During operation of the track saw 40, the track 42 may be operably attached or clamped to the workpiece 98 such that the edge of the track corresponds to the desired cutting line for the track saw, and then the track saw may be positioned relative to the track such that the raised elongated ribs 44 are positioned within the rib receiving channel 324; and the track saw may then be translated along at least a portion of the length of the elongated track, thereby producing a straight cut along the desired cutting line.

[0043] As discussed, the circular saw 10 includes a blade guard 80. The blade guard 80 may be configured to cover, receive, and / or accommodate at least one area of ​​the circular saw blade 200 to prevent or reduce the likelihood of contact between the user and the circular saw blade. In some examples of the circular saw 10, the blade guard 80 may include a retractable area 82, such as... Figure 1 As shown in the diagram. The retractable region can be configured to fold, rotate, and / or otherwise retract when the circular saw is used to cut the workpiece. The retractable region 82 may additionally or alternatively be referred to as the retractable region 82 and / or the collapsed region 82.

[0044] Figure 11 It is along Figure 3 The line 11-11 cut Figure 2-10 A non-simplified cross-sectional view of a circular saw. Figure 12-13 A cover 804, shown as a debris protector 812, may be included in and / or used with the circular saw 10. Figure 14-15 A cover 804, shown as a transparent or optically transparent window 808, may be included in and / or used with the circular saw 10. The window 808 may additionally or alternatively be referred to as a transparent or optically transparent cover 808. Figure 1 and 11 As may be best illustrated, the debris protector 812 can be configured to selectively attach to the saw blade protector 80 such that the debris protector covers or at least partially covers both the saw blade protector opening 800 and the transparent window 808, and / or such that the debris protector extends or is positioned on the offcut side of the transparent window. This operative attachment can be accomplished via the cover fastening structure 816.

[0045] However, as discussed in more detail herein, the circular saw 10 can also be configured for use without the debris guard 812, without the debris guard attached to the saw blade protection device, and / or without the debris guard covering the transparent window. In view of the above, Figure 16 This is a non-simplified right-side view of the circular saw 10 with the debris guard 812 removed, and Figure 17 It is along Figure 16 The non-simplified cross-sectional view of the circular saw 10 taken from line 17-17. Figure 18 This is an exploded view of a portion of the circular saw 10, showing the saw blade guard 80, the cover 804, and the cover fastening structure 816.

[0046] Figure 11-18 The circular saw 10 and / or its components shown may include and / or Figure 1-10 More detailed and / or different illustrations, views and / or examples of the circular saw 10 are provided. Therefore, without departing from the scope of this disclosure, reference is made to... Figure 11-18 Any structure, function, and / or feature disclosed in the circular saw 10 may (but is not required in all embodiments) be included. Figure 1-10 Circular saw 10 neutralized / or with Figure 1-10 The circular saw 10 is used together. Similarly, without departing from the scope of this disclosure, reference is made herein to... Figure 1-10 Any structure, function, and / or feature disclosed in the circular saw 10 may (but is not required in all embodiments) be included. Figure 11-18 Circular saw 10 neutralized / or with Figure 11-18 Use it together with a circular saw 10.

[0047] As discussed, the saw blade guard opening 800 is positioned to allow the user of the circular saw to observe the leading edge 228 of the circular saw blade 200 while the circular saw is cutting a workpiece. The saw blade guard 80 can be opaque, optically opaque, and / or opaque. Therefore, at least when the circular saw is used to cut a workpiece, the user may not be able to see and / or observe the leading edge 228 of the circular saw blade 200 except through and / or via the saw blade guard opening 800. In other words, at least when using the circular saw to cut a workpiece, the user may not be able to observe any structure inside the saw blade guard 80 through and / or through the saw blade guard or the saw blade guard material defining the saw blade guard. Rather, and if desired, the user can observe the leading edge of the circular saw blade through the saw blade guard opening 800.

[0048] As also discussed, the circular saw 10 and / or its blade protection device 80 includes a transparent window 808, which may be positioned within, extend within, or cover the blade protection device opening 800. However, the transparent window 808 may be at least partially or even completely optically transparent. Therefore, the user can still observe the leading edge of the circular saw blade through the blade protection device opening 800 by looking through the transparent window 808. The transparent window 808 may also be configured to restrict physical contact between the user and the circular saw blade through the blade protection device opening when the circular saw is cutting a workpiece.

[0049] The transparent window 808 can be configured to remain in place or not be removed and / or be separated from the saw blade guard 80. In other words, the circular saw 10 is intended for operation in which the transparent window 808 covers or always covers the saw blade guard opening 800. However, as Figure 18 As may be best shown, the transparent window 808 can also be configured to be selectively detached from the circular saw 10, from the saw blade guard 80, and / or disassembled from the saw blade guard to allow and / or facilitate cleaning, repair, and / or replacement of the transparent window. As an example and continuing to the present, please refer to... Figure 18 The saw blade protector 80 may include a window attachment structure 818 configured to operatively attach a transparent window 808 to the saw blade protector 80. As an example, the window attachment structure 818 may be configured to receive, butt, and / or engage corresponding areas and / or portions of the transparent window 808 to allow and / or facilitate such operative attachment. Examples of the window attachment structure 818 include slots, ribs, tracks, protrusions, and / or accommodating portions that may be at least partially defined by and / or located within the saw blade protector 80.

[0050] The transparent window 808 may include any suitable window material and / or may be formed from any suitable window material. Examples of window materials include optically transparent window materials, glass, polymers, and / or polycarbonate.

[0051] The debris protector 812 may be referred to herein as a debris protector 812 and / or may be a debris protector 812. The debris protector 812 may have any suitable transparency and therefore may be optically opaque, optically transparent, optically translucent, and / or may include areas containing two or more of these optical properties. The debris protector 812 may be configured to selectively cover or extend across at least a portion and optionally all of both the saw blade protection opening 800 and the transparent window 808 to protect the transparent window from damage and / or to avoid obstructing visual observation of the circular saw blade through the saw blade protection opening. In other words, the debris protector 812 (when present) may at least partially define the outer surface of the circular saw. In other words, and may be as follows: Figure 1 and Figure 11 As best shown in the diagram, the transparent window 808 can extend or be positioned between the debris protector 812 and the circular saw blade. The debris protector 812 can additionally or alternatively be configured to press against the workpiece when the circular saw is used to cut the workpiece, thereby reducing the possibility of workpiece breakage and / or fragmentation.

[0052] As discussed, the debris guard 812 can be configured to be selectively attached to and / or selectively detached from the circular saw. In other words, the user of the circular saw can choose to use a circular saw with an attached debris guard and / or can choose to use a circular saw with a detachable debris guard. In view of the above, the circular saw 10 and / or its debris guard 812 may also include a cover fastening structure 816. The cover fastening structure 816 can be configured to allow and / or facilitate the selective attachment of the debris guard to the blade protector and / or the selective separation or detachment of the debris guard from the blade protector, such as by screwing the cover fastening structure into and / or screwing it into and / or unscrewing it from the threaded receiving portion 84 of the blade protector or the blade protector, as described above. Figure 11 and Figure 17-18 As shown in the figure. Examples of cover fastening structures 816 include threaded fasteners, finger screws, cams, and / or selectively engaged friction and / or compression interfaces.

[0053] In some embodiments of the circular saw 10, the cover fastening structure 816 may be configured to allow and / or facilitate the selective attachment and / or removal of the debris protector 812 to and / or from the saw blade protector 80 without separating the cover fastening structure from the saw blade protector or without requiring separation of the cover fastening structure from the saw blade protector. In other words, the cover fastening structure may be configured to allow the debris protector to be selectively attached and / or removed relative to the saw blade protector, while the cover fastening structure is operatively attached to or remains operatively attached to the saw blade protector.

[0054] As an example, and if possible Figure 12-13 As best shown in 18, the debris protection element 812 may include a groove 814, and the cover fastening structure may include a threaded protrusion 820, which may be... Figure 11 and Figure 17-18 The best illustration is shown below. In some examples, the cover fastening structure can be configured to loosen to allow the debris guard to be positioned such that the threaded protrusion extends within the groove and / or such that the debris guard extends on the opposite side of the threaded protrusion. The cover fastening structure can then be configured to tighten against the debris guard to hold the debris guard on the circular saw. In this configuration, the head 822 of the cover fastening structure 816 can be configured to selectively tighten against the debris guard 812, as shown below. Figure 11 As shown, this is to hold the debris protector on the circular saw. Additionally or alternatively, the cover fastening structure 816 can be selectively loosened to separate the head 822 from the debris protector 812 and / or allow the debris protector to be removed from or slide away from the saw blade protector 80.

[0055] In some examples of the circular saw 10, the cover fastening structure 816 may additionally or alternatively be configured to retain the transparent window 808 within the saw blade guard opening 800. As an example, and possibly as... Figure 11 , Figure 14-15 and Figure 17-18 As best shown in the diagram, the transparent window 808 may include a hole 824, and the threaded protrusion 820 of the cover fastening structure 816 may be configured to extend through the hole. In this configuration, the cover fastening structure 816 may be selectively loosened, but not detached, from the saw blade protector 80 to allow the debris protector 812 to be attached to and / or detached from the saw blade protector. Additionally or alternatively, the cover fastening structure 816 may be detached from the saw blade protector 80 to allow the transparent window 808 to be detached from the saw blade protector.

[0056] As discussed, conventional circular saws may include protective protrusions, such as ribs and / or fingers, which may protrude from their conventional blade guard and / or toward the circular saw blade to reduce the likelihood of contact between the user and the rotating circular saw blade and / or the likelihood of objects getting stuck between the conventional blade guard and the rotating circular saw blade. While effective at least to some extent, such protective protrusions intentionally reduce the gap between the conventional blade guard and the circular saw blade, which may make it difficult to remove the circular saw blade from the circular saw and / or may reduce dust collection efficiency. Compared to such conventional circular saws, the circular saw 10 according to this disclosure is configured to operate with a transparent window 808 covering the blade guard opening 800. This configuration allows the circular saw 10 to omit or exclude such protective protrusions, thereby significantly increasing the gap 830 between the circular saw blade 200 and the blade guard 80 compared to conventional circular saws. Figure 1 , Figure 11 and Figure 17 As shown in the diagram. The gap 830 may also be referred to herein as and / or may be the average gap 830, mean gap 830, and / or minimum gap 830. As an example, the gap 830 in the circular saw 10 may be at least a threshold multiple of the corresponding gap in a corresponding conventional circular saw. Examples of threshold multiples include multiples of 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.25, 2.5, 2.75, 3, 3.5, 4, 4.5, or 5.

[0057] As used herein, the term “and / or” placed between the first entity and the second entity means (1) the first entity, (2) the second entity, and (3) one of the first entity and the second entity. Multiple entities listed using “and / or” should be interpreted in the same way, i.e., “one or more” of the entities thus combined. In addition to the entities specifically identified by the clause “and / or”, other entities may optionally exist, whether related to or not related to those specifically identified. Thus, as a non-limiting example, when used in conjunction with open-ended language such as “including,” a reference to “A and / or B” may in one embodiment refer only to A (optionally including entities other than B); in another embodiment, only to B (optionally including entities other than A); and in yet another embodiment, to both A and B (optionally including other entities). These entities may refer to elements, actions, structures, steps, operations, values, etc.

[0058] As used herein, the phrase “at least one” in the enumeration of one or more entities should be understood to mean at least one entity selected from any one or more entities in the entity enumeration, but is not necessarily required to include at least one of every entity specifically enumerated in the entity enumeration, or excludes any combination of entities in the entity enumeration. This definition also allows for the optional presence of entities other than those specifically identified in the entity enumeration referred to by the phrase “at least one,” whether related to or unrelated to those specifically identified entities. Thus, as a non-limiting example, “at least one of A and B” (or, equivalently, “at least one of A or B”, or, equivalently, “at least one of A and / or B”) in one embodiment may refer to at least one A, optionally including more than one A, while B is absent (and optionally including entities other than B); in another embodiment, it refers to at least one B, optionally including more than one B, while A is absent (and optionally including entities other than A); and in yet another embodiment, it refers to at least one A, optionally including more than one A, and at least one B, optionally including more than one B (and optionally including other entities). In other words, the phrases “at least one,” “one or more,” and “and / or” are open-ended expressions that are both connected and separate in operation. For example, the expressions “at least one of A, B, and C,” “at least one of A, B, or C,” “one or more of A, B, and C,” “one or more of A, B, or C,” and “A, B, and / or C” can mean A alone, B alone, C alone, A and B together, A and C together, B and C together, A, B, and C together, and any of the above that may optionally be combined with at least one other entity.

[0059] Where any patent, patent application or other reference is incorporated herein by reference and (1) defines a term in a manner inconsistent with the unincorporated portion of this disclosure or any other incorporated reference and / or (2) otherwise defines a term in a manner inconsistent with the unincorporated portion of this disclosure or any other incorporated reference, the unincorporated portion of this disclosure shall prevail, and the term or incorporated disclosure therein shall prevail only with respect to the reference that defines the term and / or the originally existing incorporated disclosure.

[0060] As used herein, the terms “suitable” and “configured” mean that an element, component, or other subject matter is designed and / or intended to perform a given function. Therefore, the use of the terms “suitable” and “configured” should not be construed as meaning that a given element, component, or other subject matter is merely “capable” of performing a given function, but rather that the element, component, and / or other subject matter is specifically selected, created, implemented, utilized, programmed, and / or designed for performing that function. Also within the scope of this disclosure, elements, components, and / or other described subject matter that are described as suitable for performing a particular function may additionally or alternatively be described as being configured to perform that function, and vice versa.

[0061] As used herein, the phrases “for example,” “as an example,” and / or simply the term “example,” when used with reference to one or more components, features, details, structures, embodiments, and / or methods according to this disclosure, are intended to convey illustrative, non-exclusive examples of the components, features, details, structures, embodiments, and / or methods according to this disclosure. Therefore, the described components, features, details, structures, embodiments, and / or methods are not intended to be limiting, essential, or exclusive / exhaustive; and other components, features, details, structures, embodiments, and / or methods, including those structurally and / or functionally similar and / or equivalent, are also within the scope of this disclosure.

[0062] As used herein, when modifying degree or relation, "at least substantially" can include not only the "substantial" degree or relation, but also the full extent of the degree or relation. A substantial degree or relation can include at least 75% of the degree or relation. For example, an object at least substantially formed of material includes an object in which at least 75% of the object is formed of material, and also includes an object entirely formed of material. As another example, a first length at least substantially as long as the second length includes a first length within 75% of the second length, and also includes a first length as long as the second length.

[0063] The following paragraphs present illustrative, non-exclusive examples of circular saws according to this disclosure.

[0064] A1. A circular saw, comprising:

[0065] A motor, the motor including a motor shaft configured to rotate about an axis of rotation;

[0066] A spindle configured to operably attach a circular saw blade to the circular saw, and to cause the circular saw blade to rotate about the spindle's rotation axis when the spindle receives torque from the motor via rotation of the motor shaft about the axis of rotation.

[0067] A saw blade protection device, wherein the saw blade protection device includes a saw blade protection device opening positioned to allow the user of the circular saw to observe the leading edge of the circular saw blade while the circular saw is cutting a workpiece; and

[0068] A transparent window, at least one of which extends within and covers the saw blade protection device opening.

[0069] A2. The circular saw according to paragraph A1, wherein the saw blade protection device is an optically opaque saw blade protection device.

[0070] A3. A circular saw according to any of paragraphs A1-A2, wherein the transparent window is configured to restrict physical contact between the user and the circular saw blade via an opening in the saw blade guard when the circular saw is cutting a workpiece.

[0071] A4. A circular saw according to any of paragraphs A1-A3, wherein a transparent window is configured to allow a user to observe the leading edge of the circular saw blade through the transparent window while the circular saw is cutting a workpiece.

[0072] A5. A circular saw according to any of paragraphs A1-A4, wherein the transparent window is optically transparent.

[0073] A6. A circular saw as described in any of paragraphs A1-A5, wherein the transparent window is configured to be selectively separated from the circular saw.

[0074] A7. The circular saw according to any of paragraphs A1-A6, wherein the saw blade protection device includes a window attachment structure configured to operably attach a transparent window to the saw blade protection device.

[0075] A8. The circular saw according to paragraph A7, wherein the window attachment structure includes at least one of a groove, rib, track, protrusion and / or receiving portion.

[0076] A9. The circular saw according to any of paragraphs A1-A8, wherein the transparent window is formed of at least one of an optically transparent window material, glass, a polymer, and polycarbonate.

[0077] A10. A circular saw according to any of paragraphs A1-A9, wherein the saw blade guard does not have a guard protrusion that protrudes from the saw blade guard and toward the circular saw blade.

[0078] A11. The circular saw according to any of paragraphs A1-A10, wherein the circular saw further includes a debris guard configured to be operably attached to the saw blade guard when the transparent window extends within the saw blade guard opening.

[0079] A12. The circular saw according to paragraph A11, wherein the debris guard is configured to cover or at least partially cover the transparent window.

[0080] A13. A circular saw according to any of paragraphs A11-A12, wherein the debris guard is positioned on the cut-off side of the transparent window.

[0081] A14. The circular saw according to any of paragraphs A11-A13, wherein the fragmentation protection is at least one of optically opaque fragmentation protection, optically transparent fragmentation protection, and translucent fragmentation protection.

[0082] A15. A circular saw according to any of paragraphs A11-A14, wherein the fragment protection is configured to press against the workpiece when the circular saw is used to cut the workpiece, thereby reducing the possibility of the workpiece breaking.

[0083] A16. The circular saw according to any of paragraphs A1-A15, wherein the circular saw includes a cover fastening structure configured to allow a fragment protector to be selectively attached to and / or to a saw blade protector, while a transparent window extends within an opening in the saw blade protector.

[0084] A17. The circular saw according to paragraph A16, wherein the cover fastening structure is configured to allow the fragment protection to be selectively attached to the saw blade protection device, while the cover fastening structure remains operatively attached to the saw blade protection device.

[0085] A18. The circular saw according to any of paragraphs A16-A17, wherein the debris guard includes a groove, wherein the cover fastening structure includes a threaded protrusion, and further wherein the cover fastening structure is configured to be loosened to allow the debris guard to be positioned such that the threaded protrusion extends within the groove and is subsequently fastened against the debris guard to retain the debris guard on the circular saw.

[0086] A19. The circular saw according to any of paragraphs A16-A18, wherein the covering fastening structure is further configured to hold the transparent window within the saw blade guard opening.

[0087] A20. The circular saw according to paragraph A19, wherein the transparent window includes a hole, and further wherein the cover fastening structure is configured to extend through the hole when the cover fastening structure operatively holds the transparent window within the saw blade guard opening.

[0088] A21. The circular saw according to any of paragraphs A1-A20, wherein the motor includes at least one of an electric motor, an AC electric motor, a DC electric motor, a brushless DC motor, a variable speed motor, and a single speed motor.

[0089] A22. A circular saw according to any of paragraphs A1-A21, wherein the circular saw further includes a gripping area configured to be gripped by the user of the circular saw during operation of the circular saw to cut a workpiece.

[0090] A23. A circular saw according to any of paragraphs A1-A22, wherein the circular saw further includes a switch configured to selectively apply current to at least one other part of the circular saw.

[0091] A24. A circular saw according to any of paragraphs A1-A23, wherein the saw blade guard is configured to prevent contact between the user and the circular saw blade.

[0092] A25. The circular saw according to paragraph A24, wherein the saw blade protection device includes a retractable region configured to retract when the circular saw is used to cut a workpiece.

[0093] A26. The circular saw according to any of paragraphs A1-A25, wherein the circular saw further includes a workpiece support configured to position the workpiece and the circular saw relative to each other when the workpiece is cut by the circular saw.

[0094] A27. The circular saw described in any of paragraphs A1-A26, wherein the circular saw further comprises at least one of the following:

[0095] (i) a power cord configured to supply current to the circular saw; and

[0096] (ii) A battery configured to supply current to the circular saw.

[0097] A28. A circular saw as described in any of paragraphs A1-A27, wherein the circular saw is at least one of the following:

[0098] (i) Handheld circular saw;

[0099] (ii) Radial arm saw;

[0100] (iii) Insert the saw;

[0101] (iv) rail saw; and

[0102] (iv) Angled saw.

[0103] A29. A circular saw as described in any of paragraphs A1-A28, wherein the circular saw is an insert saw.

[0104] A30. The circular saw according to paragraph A29, wherein the insert saw includes a base plate defining a side facing the mandrel and a side opposite the mandrel.

[0105] A31. The circular saw according to paragraph A30, wherein its central axis is operably attached to the central axis side of the substrate via a substrate pivot.

[0106] A32. The circular saw according to paragraph A31, wherein the mandrel and the substrate are configured to be operably rotated relative to each other about a pivot of the substrate to selectively change the area of ​​the circular saw blade extending on the opposite side of the mandrel on the substrate.

[0107] A33. A circular saw as described in any of paragraphs A1-A32, wherein the circular saw is a rail saw.

[0108] A34. A circular saw according to paragraph A33, wherein the track saw includes a base plate defining a side facing the mandrel and a side opposite the mandrel.

[0109] A35. The circular saw according to paragraph A34, wherein the substrate further includes a rib receiving channel configured to receive the raised elongated ribs of the track.

[0110] A36. The circular saw according to paragraph A35, wherein the track saw further includes a track, and wherein the track includes raised elongated ribs.

[0111] A37. A circular saw as described in any of paragraphs A1-A36, wherein the circular saw includes a circular saw blade.

[0112] A38. The circular saw according to paragraph A37, wherein the circular saw blade is operatively attached to the circular saw via a spindle to rotate together with the spindle.

[0113] Industrial applicability

[0114] The circular saw and methods disclosed in this article are applicable to the power tool industry.

[0115] It is believed that the above-described disclosure covers several independent inventions for independent use. Although each of these inventions has been disclosed in its preferred form, the specific embodiments disclosed and described herein should not be considered limiting, as many variations are possible. The subject matter of the invention includes all novel and non-obvious combinations and sub-combinations of the various elements, features, functions, and / or characteristics disclosed herein. Similarly, where a claim recites "a" or "first" element or its equivalent, such a claim should be understood to include combinations of one or more such elements, neither requiring nor excluding two or more such elements.

[0116] It is believed that the following claims specifically point to certain combinations and sub-combinations of one of the disclosed inventions, and that such combinations and sub-combinations are novel and non-obvious. Inventions embodied in other combinations and sub-combinations of features, functions, elements, and / or characteristics may be claimed by amendments to or presentation of new claims in this application or related applications. Such amendments or new claims, whether for different or the same invention, and whether differing in scope, broader, narrower, or equivalent to the original claims, are also considered to be included within the subject matter of the invention disclosed herein.

Claims

1. A circular saw, comprising: A motor, the motor including a motor shaft configured to rotate about an axis of rotation; A spindle configured to operably attach a circular saw blade to the circular saw, and to cause the circular saw blade to rotate about the spindle rotation axis when the spindle receives torque from the motor via rotation of the motor shaft about the axis of rotation. A saw blade protection device, wherein the saw blade protection device includes a saw blade protection device opening, the saw blade protection device opening being positioned to allow the user of the circular saw to observe the leading edge of the circular saw blade while the circular saw is cutting a workpiece; A transparent window that extends within the opening of the saw blade protection device; as well as A covering fastening structure configured to selectively attach a debris protector to the saw blade protection device as the transparent window extends within the opening of the saw blade protection device. The fragment protection component is configured to press against the workpiece when the circular saw is used to cut the workpiece, thereby reducing the possibility of the workpiece breaking.

2. The circular saw according to claim 1, characterized in that... The saw blade protection device is an optically opaque saw blade protection device.

3. The circular saw according to any one of claims 1-2, characterized in that... The transparent window is configured to restrict physical contact between the user and the circular saw blade via the saw blade protection device opening when the circular saw is cutting the workpiece.

4. The circular saw according to any one of claims 1-2, characterized in that... The transparent window is configured to allow a user to observe the leading edge of the circular saw blade through the transparent window as the circular saw cuts the workpiece.

5. The circular saw according to any one of claims 1-2, characterized in that... The transparent window is optically transparent.

6. The circular saw according to any one of claims 1-2, characterized in that... The saw blade protection device includes a window attachment structure configured to operably attach the transparent window to the saw blade protection device.

7. The circular saw according to claim 6, characterized in that... The window attachment structure includes at least one of a groove, rib, track, protrusion, and accommodating portion.

8. The circular saw according to any one of claims 1-2, characterized in that... The saw blade protection device does not have a protective device protrusion that extends from the saw blade protection device toward the circular saw blade.

9. The circular saw according to any one of claims 1-2, characterized in that... The circular saw also includes the debris protector, wherein the debris protector is configured to at least partially cover the transparent window.

10. The circular saw according to claim 9, characterized in that... The fragment protection component is positioned on the cut-off side of the transparent window.

11. The circular saw according to claim 9, characterized in that... The debris protection component is optically opaque.

12. The circular saw according to any one of claims 1-2, characterized in that... The cover fastening structure is configured to allow the fragment protection element to be selectively attached to the saw blade protection device, while the cover fastening structure remains operably attached to the saw blade protection device.

13. The circular saw according to claim 12, characterized in that... The debris protector includes a groove, and the cover fastening structure includes a threaded protrusion, and further wherein the cover fastening structure is configured to be loosened to allow the debris protector to be positioned such that the threaded protrusion extends within the groove, and subsequently tightened against the debris protector to hold the debris protector on the circular saw.

14. The circular saw according to any one of claims 1-2, characterized in that... The covering fastening structure is also configured to hold the transparent window within the opening of the saw blade protection device.

15. The circular saw according to claim 14, characterized in that... The transparent window includes a hole, and the cover fastening structure is configured to extend through the hole when the cover fastening structure operably holds the transparent window within the saw blade guard opening.

16. The circular saw according to any one of claims 1-2, characterized in that... The motor is a brushless DC motor.

17. The circular saw according to any one of claims 1-2, characterized in that... The circular saw also includes a gripping area configured to be gripped by the user of the circular saw during operation to cut the workpiece.

18. The circular saw according to any one of claims 1-2, characterized in that... The circular saw also includes a switch configured to selectively apply current to at least one other component of the circular saw.

19. The circular saw according to any one of claims 1-2, characterized in that... The saw blade protection device is configured to prevent the user from coming into contact with the circular saw blade.

20. The circular saw according to claim 19, characterized in that... The saw blade protection device includes a retractable region configured to retract when the circular saw is used to cut the workpiece.

21. The circular saw according to any one of claims 1-2, characterized in that... The circular saw also includes at least one of the following: (i) a power cord configured to supply current to the circular saw; and (ii) A battery configured to supply current to the circular saw.

22. The circular saw according to any one of claims 1-2, characterized in that... The circular saw is at least one of the following: (i) Handheld circular saw; (ii) Radial arm saw; and (iii) Angled saw.

23. The circular saw according to any one of claims 1-2, characterized in that... The circular saw includes a base plate that defines a side facing the mandrel and a side opposite the mandrel.

24. The circular saw according to claim 23, characterized in that... The mandrel is operably attached to the mandrel-facing side of the substrate via a substrate pivot, such that the mandrel-facing side of the substrate faces the mandrel.

25. The circular saw according to claim 24, characterized in that... The circular saw is an insert saw.

26. The circular saw according to claim 25, characterized in that... The mandrel and the substrate are configured to be operably rotated relative to each other about a pivot of the substrate to selectively change the area of ​​the circular saw blade extending on the opposite side of the mandrel on the substrate.

27. The circular saw according to claim 23, characterized in that... The circular saw is a rail saw.

28. The circular saw according to claim 27, characterized in that... The substrate also includes rib receiving channels configured to receive elongated ribs of the receiving track.

29. The circular saw according to claim 28, characterized in that... The rail saw also includes the rail, and the rail includes the raised elongated ribs.

30. The circular saw according to any one of claims 1-2, characterized in that... The circular saw includes the circular saw blade.

31. The circular saw according to claim 30, characterized in that... The circular saw blade is operably attached to the circular saw via a spindle so that it rotates together with the spindle.

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