Portable processing machine

Abstract

To provide a portable process machine, in which a use feeling of a user can be improved.SOLUTION: A portable process machine comprises a base, a cover part covering a cutting tool at least partially, a main body part on which the cutting tool is mounted, and an energizing member. The main body part is configured to be displaceable with respect to the base and the cover part, between a first position where the cutting tool is wholly stored in the cover part and a second position where the cutting tool is partially exposed out of the cover part. The main body part has a first contact part that can come into contact with the cover part, and the cover part has a second contact part that can come into contact with the main body part. The portable process machine is configured so that the main body part is energized by the energizing member in a direction in which the part moves from the second position toward the first position and therefore the first contact part comes into contact with the second contact part, which enables the main body part to be positioned at the first position. At least either of the first contact part and the second contact part is formed of an elastic body.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] FIELD OF THE DISCLOSURE The present disclosure relates to a plunge-type portable processing machine. [Background technology]

[0002] Various portable processing machines known as plunge-type machines are known. Patent Document 1 discloses a plunge circular saw (hereinafter simply referred to as a circular saw), which is an example of a portable processing machine. This circular saw includes a base that contacts the upper surface of a workpiece, a main body supported on the upper surface of the base, and a biasing member that biases the main body. A disk-shaped cutting tool that is rotated by an electric motor is attached to the main body. The cutting tool is housed in a cover while being biased upward by the biasing member (the position of the cutting tool at this time is also referred to as the top dead center).

[0003] When using a circular saw, the user brings the base into contact with the workpiece. Then, while the cutting tool is rotating, the user pushes the body downward from above, displacing the cutting tool downward from its top dead center. The position of the cutting tool when it is displaced downward to its maximum extent is also referred to as its bottom dead center. At this time, the lower part of the cutting tool protrudes below the base, and cutting of the workpiece begins. Next, while maintaining the cutting tool at its bottom dead center, the user moves the circular saw forward to the cutting end position. Then, the user stops the rotation of the cutting tool. When the user releases the pressure on the body, the cutting tool (body) returns from its bottom dead center to its top dead center due to the biasing force of the biasing member. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2021-98254 Summary of the Invention [Problem to be solved by the invention]

[0005] In this type of plunge saw, when the main body returns to the top dead center, depending on the biasing force of the biasing member, the main body may abut against the cover with force, which may affect the user's usability. Therefore, not only in plunge saws but also in portable processing machines in which the main body is biased from the bottom dead center to the top dead center by a biasing member, there is room for improvement in the user's usability. [Means for solving the problem]

[0006] According to a first aspect of the present disclosure, there is provided a portable processing machine. The portable processing machine includes a base for contacting a workpiece, a cover, a main body, and an urging member. The base is configured to contact the workpiece. The cover is disposed on a first side of the base and configured to at least partially cover a cutting tool. The main body is disposed on the first side of the base. The main body houses an electric motor that rotates the cutting tool. The main body is configured to be displaceable relative to the base and the cover between a first position in which the cutting tool is entirely housed within the cover and a second position in which the cutting tool protrudes beyond the base to a second side opposite the first side and is partially exposed outside the cover. The urging member is configured to urge the main body in a direction from the second position toward the first position. Furthermore, the main body has a first contact portion that can contact the cover. The cover has a second contact portion that can contact the main body. The portable processing machine is configured such that the main body is urged by the urging member and the first contact portion contacts the second contact portion, thereby positioning the main body at the first position. At least one of the first contact portion and the second contact portion is made of an elastic body.

[0007] According to this aspect, when the main body and the cover come into contact with each other, at least one of the first contact portion and the second contact portion is elastically deformed, thereby mitigating the impact caused by the contact, thereby improving the user experience.

[0008] According to a second aspect of the present disclosure, there is provided a portable processing machine. The portable processing machine includes a base for contacting a workpiece, a cover, a main body, and an urging member. The base is configured to contact the workpiece. The cover is disposed on a first side of the base and configured to at least partially cover a cutting tool. The main body is disposed on the first side of the base. The main body houses an electric motor that rotates the cutting tool. The main body is configured to be displaceable relative to the base and the cover between a first position in which the cutting tool is entirely housed within the cover and a second position in which the cutting tool protrudes beyond the base to a second side opposite the first side and is partially exposed outside the cover. The urging member is configured to urge the main body in a direction from the second position to the first position. Furthermore, the main body has a first contact portion that can contact the cover. The cover has a second contact portion that can contact the main body. The portable processing machine is configured so that the main body is positioned at the first position when the main body is urged by the urging member and the first abutment portion abuts against the second abutment portion. In other words, the portable processing machine is configured so that the first abutment portion abuts against the second abutment portion when the main body returns from the second position to the first position due to the urging force of the urging member. At least one of the first abutment portion and the second abutment portion is formed in a sheet shape.

[0009] According to this aspect, when the main body portion and the cover portion come into contact with each other, the sheet-like contact portion can mitigate the impact when the main body portion and the cover portion come into contact with each other. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a perspective view showing a circular saw according to a first embodiment, illustrating a state in which a main body is at the top dead center. FIG. [Figure 2] FIG. 2 is a perspective view of the circular saw, showing a state in which the main body is at the bottom dead center. [Figure 3]FIG. 1 is a perspective view of a circular saw with the main body at the top dead center; [Figure 4] FIG. 1 is a perspective view of a circular saw with the main body at the bottom dead center; [Figure 5] FIG. 2 is a front view of the circular saw, showing the state in which the main body is at the top dead center. [Figure 6] FIG. [Figure 7] 7 is a cross-sectional view taken along line VII-VII in FIG. 5, showing a state in which the main body is at the top dead center. [Figure 8] FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. 7. [Figure 9] FIG. 10 is a partial cross-sectional view showing a circular saw according to a second embodiment, illustrating a state in which the main body is at the top dead center. [Figure 10] FIG. 10 is a partial cross-sectional view showing the circular saw of the third embodiment, illustrating a state in which the main body is at the top dead center. [Figure 11] FIG. 10 is a partial cross-sectional view showing the circular saw of the fourth embodiment, illustrating a state in which the main body is at the top dead center. DETAILED DESCRIPTION OF THE INVENTION

[0011] In one non-limiting embodiment of the present disclosure, the at least one contact portion may be formed from an elastic resin. According to this embodiment, the impact when the main body and the cover come into contact can be reduced, improving the user's usability.

[0012] In addition to or instead of the above embodiment, at least one of the abutment portions may be formed in a columnar or cylindrical shape with a side surface located at the portion where the first abutment portion and the second abutment portion abut. According to this embodiment, when the main body and the cover come into contact with each other, at least one of the contact portions is entirely bent, so that the impact at the time of contact can be effectively alleviated.

[0013] In addition to or instead of the above embodiment, the at least one contact portion may be the second contact portion. The cover portion may further include a holding portion that holds the second contact portion. The holding portion may be configured to expose a portion of the outer peripheral side surface of the second contact portion that faces the first contact portion and to cover at least half of the side surface. According to this embodiment, excessive deformation of the second contact portion during contact can be suppressed, which improves the durability of the second contact portion and also suppresses the second contact portion from falling off.

[0014] In addition to or instead of the above embodiment, the cover portion may further include a depth guide configured to define a protruding depth of the cutting tool toward the second side relative to the base. The holding portion may be provided on the depth guide. According to this embodiment, the second contact portion can be held using the depth guide, which prevents the number of parts in the portable processing machine from increasing and the assembly process from becoming complicated.

[0015] In addition to or instead of the above embodiment, the at least one abutting portion may be configured by a rubber pin. According to this embodiment, the rubber pin, which is an inexpensive general-purpose item, can be used to reduce the impact when the main body and cover come into contact with each other.

[0016] In addition to or instead of the above embodiment, the at least one contact portion may be formed of an elastic sheet. According to this embodiment, the elastic sheet can be used to reduce the impact when the main body and the cover come into contact with each other.

[0017] First Embodiment A first embodiment of the present disclosure will be described below with reference to FIGS. 1 to 8. In this embodiment, a plunge circular saw 10 (hereinafter simply referred to as the "circular saw 10"), which is a type of portable cutting machine, will be illustrated as an example of a portable processing machine. For ease of explanation, the side where a user is when holding the circular saw 10 and processing (cutting) a workpiece will be defined as the rear side of the circular saw 10, and the opposite side will be defined as the front side of the circular saw 10. In addition, the side positioned vertically above will be defined as the upper side of the circular saw 10, and the opposite side will be defined as the lower side of the circular saw 10. In addition, the direction perpendicular to the front-rear direction and the up-down direction will be defined as the left-right direction of the circular saw 10. In the left-right direction, the right side when viewed from the rear to the front will be defined as the right side of the circular saw 10, and the opposite side will be defined as the left side of the circular saw 10.

[0018] First, we will explain the general configuration of the circular saw 10. The circular saw 10 includes a base 20 for contacting the upper surface of a workpiece, a main body 30, a cover 50, and a biasing member 23.

[0019] The base 20 is formed in a substantially rectangular shape. The longitudinal direction of the base 20 is the front-to-rear direction. The base 20 has a lower surface 21 that is brought into contact with the upper surface of the workpiece when cutting the workpiece. However, the base 20 is not necessarily positioned so that the lower surface 21 comes into contact with the upper surface of the workpiece. When a ruler is used together with the circular saw 10 to cut the workpiece linearly, the base 20 may be positioned so that the lower surface 21 comes into contact with the upper surface of the ruler.

[0020] The main body 30 is basically disposed above the base 20. As shown in FIGS. 3 and 4, the main body 30 includes a motor housing 31, a gear housing 60, and a grip portion 32 for a user to hold with their hand. The gear housing 60 is formed of a metal material such as magnesium. A front grip 34 is provided at the front end of the main body 30. The grip portion 32, the front grip 34, and the motor housing 31 are formed of a synthetic resin material such as polyamide. As shown in FIG. 3, a support shaft 22 is provided at the rear side of the gear housing 60. The support shaft 22 extends in a direction intersecting the up-down direction (the left-right direction in FIG. 3). The main body 30 is supported on the upper surface of the base 20 via the support shaft 22 and an angular 26.

[0021] The motor housing 31 accommodates an electric motor 33 having a motor shaft (not shown). The gear housing 60 accommodates a reduction gear (not shown) and an output shaft 61 (see FIG. 7). A cutting tool 35 (see FIGS. 2 and 4) is detachably attached to the tip of the output shaft 61. The cutting tool 35 is a circular saw blade known as a tipped saw blade. The electric motor 33 rotates the cutting tool 35 via the reduction gear and the output shaft 61.

[0022] The cover part 50 is disposed above the base 20 and on the right edge of the base 20. The cover part 50 is substantially perpendicular to the support shaft 22 of the main body part 30. In this embodiment, angular plates 24, 25 are fixed to the front and rear edges of the base 20, respectively. An angular contact 26 is fixed between the angular contact plate 24 and the angular contact plate 25 of the base 20. The cover part 50 is fixed to the base 20 via the angular contact 26 and the angular contact plates 24, 25. Note that, when the thumb screws 27, 28 attached to the angular contact plates 24, 25 are loosened, the fixed relationship between the angular contact 26 fixed to the cover part 50 and the angular contact plates 24, 25 is released. This allows the main body part 30 and the cover part 50 to be tilted relative to the base 20, allowing the cutting tool 35 to cut obliquely into the workpiece.

[0023] The cover part 50 includes a cover main body 52 and a depth guide 70 fixed to the left side surface of the cover main body 52. ​​The cover main body 52 is configured to be able to at least partially accommodate the cutting tool 35 therein. The depth guide 70 is fixed to the left side surface of the cover main body 52. ​​Details of the depth guide 70 will be described later.

[0024] As shown in Figures 3, 6, and 7, an arc-shaped through-hole 37 is formed in the left side surface of the cover body 52, penetrating the left side surface in the left-right direction. The output shaft 61 passes through this through-hole 37 and extends into the interior of the cover body 52. ​​The cutting tool 35 is detachably attached to the tip of the output shaft 61 by a flange (not shown). As a result, when the electric motor 33 is driven by receiving power supply from the battery 45 (see Figures 3 and 4), the cutting tool 35 rotates integrally with the output shaft 61 about the rotation axis AX1 (see Figure 7). A trigger 38 (see Figure 4) is provided at the front end of the grip portion 32 for starting and stopping the electric motor 33.

[0025] 4, a battery mounting section 46 is disposed at the rear and lower portion of the main body 30. A battery 45 serving as a DC power source can be slidably mounted in the battery mounting section 46.

[0026] The main body 30 is configured to move (swing) vertically relative to the base 20 and the cover 50, describing an arc-shaped path around a support shaft 22 supported by the base 20. The support shaft 22 (i.e., the swing axis AX2 of the main body 30) is parallel to the rotation axis AX1. As shown in FIGS. 1 and 3, the main body 30 is movable between a position (also referred to as top dead center) in which the entire cutting tool 35 is located above the underside 21 of the base 20 and is entirely housed within the cover 50, and a position (also referred to as bottom dead center when the cutting tool 35 protrudes most from the underside 21) in which the cutting tool 35 protrudes downward beyond the underside 21 of the base 20 and is partially exposed outside the cover 50, as shown in FIGS. 2 and 4. The cutting tool 35 being "entirely" housed within the cover part 50 means that the entire cutting tool 35 is not located outside the outer periphery of the cover part 50 when viewed in the direction in which the rotation axis AX1 extends. The swing direction of the main body part 30 is also the direction from the top dead center toward the bottom dead center and the direction from the bottom dead center toward the top dead center.

[0027] The biasing member 23 is disposed on the support shaft 22. In this embodiment, a torsion spring is used as the biasing member 23. The biasing member 23 constantly biases the main body 30 from the bottom dead center toward the top dead center. Therefore, the top dead center is the initial position of the main body 30.

[0028] The circular saw 10 is further configured to lock the main body 30 at the top dead center. In this embodiment, a recess 51 (see FIG. 4) is formed on the left side surface of the cover 50 (more specifically, on the depth guide 70). The main body 30 also has a lock pin 39 (see FIG. 3) extending from the gear housing 60 toward the cover 50. The lock pin 39 is constantly biased toward the right (toward the cover 50) by a biasing member (not shown). When the lock pin 39 is positioned facing the recess 51, the tip of the lock pin 39 fits into the recess 51. This constantly locks the main body 30 at the top dead center. When the user operates the lock-off button 40 (see FIG. 4), the lock pin 39 retracts to the left against the biasing force of the biasing member. This releases the engagement between the lock pin 39 and the recess 51. In this state, when the user presses the main body 30 downward, the main body 30 is displaced toward the bottom dead center against the biasing force of the biasing member 23. When the user releases the pressure on the main body 30, the biasing force of the biasing member 23 returns the main body 30 to the top dead center, and the lock pin 39 fits into the recess 51. In this way, the main body 30 is automatically locked at the top dead center.

[0029] The circular saw 10 of this embodiment is equipped with a depth guide 70 and a stopper 41, which can determine the position of the lower movable end of the main body 30. Determining the position of the lower movable end of the main body 30 (the lower limit of movement) also determines the amount of protrusion of the cutting tool 35 from the lower surface 21 of the base 20.

[0030] As described above, the depth guide 70 is fixed to the left side surface of the cover main body 52. ​​In this embodiment, the depth guide 70 is made of synthetic resin. As shown in FIGS. 6 and 7 , the depth guide 70 includes a guide portion 71 having a generally arc-shaped configuration centered on the swing axis AX2, and a bent portion 73 that bends from an upper end 711 of the guide portion 71 toward the support shaft 22. A lower end 712 of the guide portion 71 is disposed near the upper surface of the base 20. A generally arc-shaped groove 72 is formed in the guide portion 71. In addition, a scale 71d corresponding to the protrusion amount (cutting depth) of the cutting tool 35 is marked on the edge of the guide portion 71.

[0031] As shown in Figures 6 to 8, a cylindrical member 77 made of an elastic material is provided on the lower side (bottom dead center side) of the bending portion 73 in the swing direction. In this embodiment, the cylindrical member 77 extends parallel to the axes AX1 and AX2, and the hole 771 of the cylindrical member 77 is parallel to the axes AX1 and AX2. In this embodiment, the cylindrical member 77 is made of an elastic resin. Examples of the elastic resin include synthetic resin and thermoplastic elastomer.

[0032] The bent portion 73 has an opening on the bottom dead center side and a groove-shaped retaining portion 74 that curves from the bottom dead center side to the top dead center side. The retaining portion 74 covers at least half of the outer peripheral side surface 78 of the cylindrical member 77, leaving the side surface on the bottom dead center side of the outer peripheral side surface 78 of the cylindrical member 77 exposed. Note that, in this embodiment, the hole 771 of the cylindrical member 77 is located within the depth guide 70 and is not exposed to the outside of the depth guide 70. In this embodiment, the retaining portion 74 opens in a direction parallel to the axes AX1 and AX2, and is configured so that the cylindrical member 77 can be inserted through the opening in the direction of the rotation axis AX1.

[0033] The stopper 41 is configured to come into contact with the main body 30 when it moves toward the bottom dead center. In this embodiment, the stopper 41 is disposed in a groove 72 of the depth guide 70 and configured to be fixable to a guide portion 71 around the periphery of the groove 72. As shown in FIG. 3 , the stopper 41 is provided with a thumbscrew 42, and the position of the stopper 41 in the vertical direction in the groove 72 can be changed by loosening the thumbscrew 42. The stopper 41 can also be fixed to the guide portion 71 by tightening the thumbscrew 42.

[0034] The right end of the main body 30 (gear housing 60) is disposed to the left of the cover body 52 and inside the guide portion 71 (on the support shaft 22 side). The right end of the gear housing 60 has a surface (contact surface 67) facing the top dead center side in the swing direction. The contact surface 67 faces the cylindrical member 77 in the swing direction.

[0035] The user can push down the main body 30 until the gear housing 60 abuts against the stopper 41. As described above, the stopper 41 is configured to be positionally adjustable relative to the guide 71. This allows the user to change the position of the stopper 41 (i.e., the position of the lower end of the stroke) according to the desired cutting depth. The bottom dead center described above is the position of the main body 30 when the main body 30 is lowered to the lower end of the stroke with the stopper 41 positioned at its lowest point. When the user releases the force pushing the main body 30 downward while the main body 30 is at the lower end of the stroke, the main body 30 is urged toward the top dead center by the biasing force of the biasing member 23 and returns to the top dead center. At this time, the abutment surface 67 of the main body 30 abuts against the depth guide 77, positioning the main body 30 at the top dead center.

[0036] When cutting a workpiece using the circular saw 10 described above, the user abuts the lower surface 21 of the base 20 against the upper surface of the workpiece. The user also adjusts the position of the stopper 41 depending on the desired cutting depth. Next, the user, for example, holds the front grip 34 with one finger and operates the lock-off button 40 with the other finger to disengage the lock pin 39 from the recess 51. The user then depresses the trigger 38 with the other finger to rotate the electric motor 33 (i.e., rotate the cutting tool 35), and then presses the main body 30 down to the bottom dead center. This starts cutting the workpiece. The user cuts the workpiece by moving the circular saw 10 in the cutting direction (forward). When the user is finished cutting, the user can stop the circular saw 10 by releasing the trigger 38.

[0037] When the user releases the downward pressure on the main body portion 30 at the end of cutting, the biasing member 23 moves the main body portion 30 to the top dead center, and the tubular member 77 of the cover portion 50 comes into contact with the contact surface 67 of the main body portion 30. At this time, the biasing force of the biasing member 23 causes the main body portion 30 to come into contact with the cover portion 50 with force. In this embodiment, the tubular member 77 is made of an elastic resin, and the elastic deformation of the tubular member 77 can alleviate the impact when the main body portion 30 and the cover portion 50 come into contact. This reduces the contact noise (collision noise) between the main body portion 30 and the cover portion 50, improving the user experience.

[0038] Furthermore, since the impact when the main body 30 and the cover 50 come into contact with each other can be alleviated, the lifespan of the main body 30 and the cover 50 can be extended. In this embodiment, it is possible to effectively prevent the metal gear housing 60 from coming into forceful contact with the resin depth guide 70, which would affect the user's usability.

[0039] When finishing a cut, the user may release the trigger 38 and lift the circular saw 10 upward, for example, to check the cut portion. At this time, the base 20 moves away from the workpiece, and the downward pressure on the main body 30 is released. In such a case, the impact caused by the contact between the main body 30 and the cover 50 is more likely to be transmitted to the user. In the circular saw 10 of this embodiment, the cylindrical member 77 elastically deforms to reduce the impact caused by the contact. Therefore, even if the user lifts the circular saw 10 forward and upward as described above when finishing a cut, the force (impact) transmitted to the user can be reduced. This improves the user's usability regardless of the user's usage mode at the end of the cut.

[0040] In this embodiment, a cylindrical member 77 made of elastic resin is used as the contact portion of the cover portion 50 with the main body portion 30. The cylindrical member 77 has a hole 771, so that the entire cylindrical member 77 is easily bent when the main body portion 30 and the cover portion 50 contact each other. This further reduces the impact caused by the contact.

[0041] Furthermore, the tubular member 77 is held by a holding portion 74 provided on the depth guide 70. This prevents an increase in the number of parts of the circular saw 10 and complexity of assembly, which would be caused by providing a separate structure for holding the tubular member 77. The holding portion 74 also covers more than half of the outer peripheral side surface 78 of the tubular member 77, leaving the side surface 78 on the bottom dead center side exposed. This prevents excessive deformation of the tubular member 77 upon contact. Furthermore, this prevents the tubular member 77 from falling off the depth guide 70 upon contact.

[0042] Second Embodiment A circular saw 10A according to a second embodiment will be described with reference to Fig. 9. The circular saw 10A according to the second embodiment differs from the first embodiment in the configuration of the portion where the cover 50A and the main body 30 come into contact. Note that, in the following, the same reference numerals are used for the same configurations as those in the above-described embodiment, and the description thereof will be omitted.

[0043] Figure 9 shows a portion of the circular saw 10A of this embodiment that corresponds to the portion enclosed by the dashed line X in Figure 7 of the first embodiment. The bent portion 73 of the depth guide 70A is provided with two groove-shaped retaining portions 74A that open toward the bottom dead center and curve from the bottom dead center toward the top dead center. Each retaining portion 74A extends parallel to the axes AX1 and AX2. The two retaining portions 74A are arranged side by side in a substantially vertical direction. Each retaining portion 74A has a semicircular cross section.

[0044] A rubber pin 77A is press-fitted into each of the retaining portions 74A. The rubber pin 77A is a cylindrical member made of rubber and is a general-purpose part commonly used in power tools. The retaining portion 74A covers approximately half of the outer peripheral side surface 78A of the rubber pin 77A, leaving the side surface 78A on the bottom dead center side exposed. When the main body 30 is biased toward the top dead center and abuts against the cover portion 50, the rubber pin 77A elastically deforms.

[0045] According to the circular saw 10A of this embodiment, the rubber pin 77A, which is an inexpensive, general-purpose item, can be used to reduce the impact when the main body 30 and the cover 50A come into contact with each other. Therefore, the same effects as those of the first embodiment can be achieved. Furthermore, since the rubber pin 77A is easily available, it is more convenient for the user when replacement is required.

[0046] Third Embodiment A circular saw 10B according to a third embodiment will be described with reference to FIG. 10. FIG. 10 illustrates a portion of the circular saw 10B according to this embodiment that corresponds to the portion enclosed by the dashed line X in FIG. 7 of the first embodiment. In this embodiment, the bent portion 73 of the depth guide 70B does not have an elastic body, but has a surface (contact surface 79B) facing the bottom dead center in the swing direction. An elastic sheet 69B is fixed to a surface 67B of the right end portion of the main body 30B facing the top dead center in the swing direction. In this embodiment, a rubber sheet is used as the elastic sheet 69B. The elastic sheet 69B faces the contact surface 79B in the swing direction. When the main body 30B is biased toward the top dead center and contacts the cover 50B (contact surface 79B), the elastic sheet 69B elastically deforms.

[0047] According to the circular saw 10B of this embodiment, the elastic sheet 69B can be used to reduce the impact when the main body 30B and the cover 50B come into contact with each other, thereby achieving the same effects as those of the first embodiment.

[0048] <Correspondence> The correspondence between the components of the above embodiment and the components of the technology of the present disclosure is shown below. However, the components of the embodiment are merely examples and do not limit the components of the technology of the present disclosure. The contact surface 67 and the elastic sheet 69B are an example of a "first contact portion." The cylindrical member 77, the rubber pin 77A, and the contact surface 79B are an example of a "second contact portion." The upper and lower sides of the base 20 are examples of a "first side relative to the base" and a "second side relative to the base", respectively. The top dead center and the bottom dead center are examples of the "first position" and the "second position", respectively.

[0049] <Fourth embodiment> In the above embodiment, either the cover 50, 50A, 50B or the main body 30, 30B includes an abutment portion (cylindrical member 77, rubber pin 77A, elastic sheet 69B) formed of an elastic material. Alternatively, both the cover and main body may include an abutment portion formed of an elastic material. For example, as shown in FIG. 11 , an elastic sheet 69B may be fixed to a surface 67B of the right end portion of the main body 30B facing the top dead center in the swing direction, and an elastic sheet 78C may be fixed to a surface 79C of the depth guide 70C facing the bottom dead center. This configuration further reduces the impact when the main body and cover abut.

[0050] The contact portion between the cover and the main body is not limited to an elastic body, and may be a sheet made of felt, foam, etc. In this embodiment, the sheet can reduce the impact when the main body and the cover contact each other.

[0051] The circular saws 10 to 10C may be provided with a power cord that can be connected to an external AC power source, and may be driven by an external AC power source.

[0052] The above configuration is not limited to circular saws, but can be applied to other plunge-type tools that are configured to return the main body to the top dead center by the biasing force of the biasing member, such as portable processing machines such as aluminum groove cutters and wall chasers.

[0053] The present disclosure is not limited to the above-described embodiments and can be realized in various configurations without departing from the spirit thereof. For example, the technical features in the embodiments corresponding to the technical features in each aspect described in the Summary of the Invention section can be appropriately replaced or combined to solve some or all of the above-described problems or achieve some or all of the above-described effects. Furthermore, if a technical feature is not described as essential in this specification, it can be appropriately deleted. [Explanation of symbols]

[0054] 10, 10A, 10B: circular saw, 20: base, 21: underside, 22: support shaft, 23: biasing member, 24, 25: angular plate, 26: angular, 27, 28: thumb screw, 30, 30B: main body, 31: motor housing, 32: grip, 33: electric motor, 34: front grip, 35: cutting tool, 37: through hole, 38: trigger, 39: lock pin, 40: lock-off button, 41: stopper, 42: thumb screw, 45: battery, 46: battery mounting part, 50, 50A, 50B: cover , 51: recess, 52: cover body, 60: gear housing, 61: output shaft, 67: contact surface, 67B: surface, 69B: elastic sheet, 70, 70A, 70B: depth guide, 70C: depth guide, 71: guide portion, 71d: scale, 72: groove, 73: bending portion, 74: holding portion, 74A: holding portion, 77: cylindrical member, 77A: rubber pin, 78: side surface, 78A: side surface, 78C: elastic sheet, 79B: contact surface, 79C: surface, 711: upper end portion, 712: lower end portion, 771: hole, AX1: rotation axis, AX2: oscillation axis

Claims

1. A portable processing machine, a base that is brought into contact with the workpiece; a cover portion disposed on a first side of the base and at least partially covering the cutting tool; a main body portion that houses an electric motor that rotates the cutting tool, is disposed on the first side of the base, and to which the cutting tool is attached, the main body portion being configured to be displaceable with respect to the base and the cover portion between a first position where the cutting tool is entirely housed within the cover portion and a second position where the cutting tool protrudes beyond the base to a second side opposite the first side and is partially exposed outside the cover portion; a biasing member that biases the main body portion in a direction from the second position toward the first position, the main body portion has a first abutment portion that can abut against the cover portion, the cover portion has a second abutment portion that can abut against the main body portion, the portable processing machine is configured so that the main body is urged by the urging member and the first contact portion contacts the second contact portion, thereby positioning the main body at the first position, the second contact portion is made of an elastic body and has a columnar or cylindrical shape with a side surface disposed at a portion that contacts the first contact portion, the cover portion further includes a holding portion that holds the second contact portion, the holding portion exposes a portion of the outer peripheral side surface of the second contact portion that faces the first contact portion, and covers at least half of the side surface. Portable processing machine.

2. The portable processing machine according to claim 1, The second contact portion is formed from an elastic resin.

3. The portable processing machine according to claim 1, the cover portion further includes a depth guide for defining a protruding depth of the cutting tool toward the second side relative to the base, The holding portion is provided on the depth guide.

4. The portable processing machine according to claim 1 or 2, The portable processing machine, wherein the second contact portion is constituted by a rubber pin.

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