Reciprocating power tool

Abstract

A reciprocating power tool includes a housing, a first cylindrical member, a slider, a second cylindrical member, and a locking member. The first cylindrical member is rotatable about a first axis and has a single first protrusion projecting radially inward. The second cylindrical member is rotatable about a second axis and has a single second protrusion projecting radially outward. In the circumferential direction, the second cylindrical member has a protrusion projecting radially outward and allowing the locking member to move from a locked position to an unlocked position. The first protrusion engages with the second protrusion as the first cylindrical member rotates from a first position to a second position and causes the second cylindrical member to rotate from an engaged position to a disengaged position. When the first cylindrical member is in the first position, the first protrusion does not engage with the second protrusion and allows the second cylindrical member to rotate. The second protrusion is provided at a portion of the second cylindrical member different from the protrusion. Accordingly, the clamping mechanism of the reciprocating power tool can be improved.

Description

Technical Field

[0001] The present disclosure relates to a reciprocating power tool configured to reciprocate a blade. Background Art

[0002] A reciprocating power tool (e.g., a reciprocating saw) is known which is configured to reciprocate a blade by the power of a motor to cut a workpiece. Generally, a user needs to replace the blade mounted on the reciprocating power tool according to the operation or when the blade is worn. Therefore, for example, Patent Document 1 discloses a reciprocating power tool having a clamping mechanism that enables the blade to be installed and removed without using a special tool.

[0003] [Prior Art Documents]

[0004] [Patent Documents]

[0005] Patent Document 1: U.S. Patent No. 8,230,607 Summary of the Invention

[0006] [Technical Problem to be Solved by the Invention]

[0007] The above clamping mechanism enables the blade to be installed and removed only by manually operating an operating lever from the outside of the housing. On the other hand, there is still room for further improvement in such a clamping mechanism.

[0008] An object of the present disclosure (the present invention) is to provide a technique that helps to improve the blade mounting / dismounting structure of a reciprocating power tool.

[0009] [Technical Solution for Solving the Technical Problem]

[0010] According to one aspect of the present invention, there is provided a reciprocating power tool having a housing, a first cylindrical member, a slider, a second cylindrical member, and a locking member. The first cylindrical member is supported by the housing so as to be rotatable about a first axis between a first position and a second position. The first axis defines the front-rear direction of the reciprocating power tool. The first cylindrical member has an operation portion and a single (individual) first protrusion. The operation portion is configured to be manually operable outside the housing. The first protrusion protrudes radially inward of the first cylindrical member. The slider is an elongated slider having a second axis. The slider has a first end portion to which a blade can be detachably attached. The slider is supported by the housing so as to be reciprocable along the extending direction of the second axis. The second cylindrical member is connected to the first end portion so as to be rotatable about the second axis between an engaged position and a disengaged position. The second cylindrical member is disposed inside the first cylindrical member. A second protrusion protrudes radially outward of the second cylindrical member. The locking member is disposed inside the second cylindrical member. The locking member can move radially along the second cylindrical member between a locked position where it can engage with the blade and an unlocked position where it cannot engage with the blade in accordance with the rotation of the second cylindrical member between the engaged position and the disengaged position.

[0011] In the circumferential direction about the second axis, a part of the second cylindrical member forms a protruding portion that protrudes radially outward more than the remaining part. The protruding portion is configured to allow the locking member to move to the unlocked position. The first protrusion is configured such that, in the process of rotating the first cylindrical member from the first position to the second position according to the manual operation of the operation portion, the first protrusion engages with the second protrusion, causing the second cylindrical member to rotate from the engaged position to the disengaged position. Further, it is configured that when the first cylindrical member is in the first position, the first protrusion does not engage with the second protrusion and allows the second cylindrical member to rotate. The second protrusion is provided at a portion of the second cylindrical member different from the protruding portion.

[0012] In the reciprocating power tool of this aspect, when the first cylindrical member is rotated from the first position to the second position according to the manual operation of the operation portion, the second cylindrical member rotates from the engaged position to the disengaged position, and the locking member can move to the unlocked position. A protruding portion that allows the locking member to move to the unlocked position is provided on the second cylindrical member. Further, the second protrusion that can engage with the first protrusion of the first cylindrical member is provided on a portion of the second cylindrical member different from the protruding portion. With such a structure, it is possible to sufficiently ensure the protruding length of the second protrusion that engages with the first protrusion, and it is possible to suppress the overall radial enlargement of the second cylindrical member including the second protrusion. Further, by setting the number of the first protrusion and the second protrusion to one respectively, it is possible to select the optimum positions respectively, and it is possible to simplify the structures of the first cylindrical member and the second cylindrical member.

[0013] In one aspect of the present disclosure, the slider may be configured such that during reciprocating movement in a substantially front-rear direction along the second axis, the blade performs a locus movement by swinging in an up-down direction orthogonal to the first axis. Further, the so-called locus movement typically refers to movement along an elliptical locus path. It may also be that the second protrusion is configured to move within a range not overlapping with the first plane in accordance with the rotation of the second cylindrical member between the engaged position and the disengaged position regardless of the position of the second cylindrical member. The first plane refers to a plane that includes the first axis and extends in the up-down direction.

[0014] According to this aspect, by the locus movement of the blade, the cutting efficiency can be improved. On the other hand, according to the reciprocating movement and swinging of the slider, the position of the second axis relative to the first axis changes in the up-down direction. That is, the positional relationship between the first cylindrical member and the second cylindrical member may also change in the up-down direction. Therefore, in the case where a plurality of first protrusions and second protrusions are respectively provided, due to the misalignment of the first cylindrical member and the second cylindrical member in the up-down direction, it is possible that the engagement of at least one of the plurality of first protrusions with at least one of the plurality of second protrusions becomes inappropriate. Further, in the case where the second protrusion is disposed at a position overlapping with the first plane, that is, directly above or directly below the first axis, the positional relationship between the first protrusion and the second protrusion is more likely to change significantly compared to the case where it is located at other positions. According to this aspect, the number of the first protrusion and the second protrusion is only one respectively, and further, regardless of the position of the second cylindrical member relative to the first cylindrical member and the rotational position of the second cylindrical member, the second protrusion does not overlap with the first plane, so that the possibility of poor engagement between the first protrusion and the second protrusion can be reduced.

[0015] In one aspect of the present disclosure, it may be that regardless of which position the second cylindrical member is in between the engaged position and the disengaged position, the protrusion and the second protrusion are disposed at positions opposite to each other with respect to the first plane. According to this aspect, a reasonable arrangement of the protrusion and the second protrusion can be achieved.

[0016] In one aspect of the present disclosure, it may be that when the second cylindrical member is disposed at the engaged position, the second protrusion is disposed at an intermediate portion of the movement path of the first protrusion when the first cylindrical member rotates from the first position to the second position. In other words, it may also be that the first protrusion is configured to engage with the second protrusion at an intermediate stage of the process of the first cylindrical member rotating from the first position to the second position. According to this aspect, the possibility of interference between the first protrusion and the second protrusion when the first cylindrical member is at the first position can be reduced. Further, the so-called "intermediate portion" in this aspect is not limited to the strict intermediate position of the movement path and may include a certain range before and after the intermediate position.

[0017] In one aspect of the present disclosure, the operating portion may protrude radially outward from the first cylindrical member. The first protrusion may be circumferentially disposed at substantially the same position as the operating portion on the first cylindrical member. According to this aspect, a reasonable configuration that can easily ensure the strength of the operating portion and the first protrusion can be achieved.

[0018] In one aspect of the present disclosure, the housing may have an opening. The opening may extend in the up-down direction orthogonal to the first axis and expose the operating portion to the outside of the housing. The operating portion may be movable between the lower end portion and the upper end portion of the opening by manual operation. When the second cylindrical member is disposed at the engaged position, the second protrusion may be disposed at a position corresponding to the central portion in the up-down direction of the opening. According to this aspect, the possibility of interference between the first protrusion and the second protrusion before manually operating the operating portion can be reduced.

[0019] In one aspect of the present disclosure, the first protrusion may be configured to engage with the second protrusion in accordance with the rotation of the first cylindrical member from the first position to the second position regardless of the position of the slider in the front-rear direction. According to this aspect, regardless of the position of the second cylindrical member in the front-rear direction, the user can rotate the second cylindrical member from the engaged position to the disengaged position by rotating the first cylindrical member from the first position to the second position only by operating the operating portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a cross-sectional view of the reciprocating saw when the crank plate is in the first rotational position.

[0021] Figure 2 is Figure 1 a partial enlarged view of.

[0022] Figure 3 is an exploded perspective view of the slider, the clamping mechanism, the release mechanism, and the blade.

[0023] Figure 4 is Figure 2 a cross-sectional view corresponding to the IV-IV cross-sectional view of (however, it shows the state where the slider is disposed at the rearmost position within the movable range).

[0024] Figure 5 is Figure 2 a cross-sectional view corresponding to, and is a view showing the state where the crank plate is in the second rotational position.

[0025] Figure 6 is Figure 4 a VI-VI cross-sectional view of.

[0026] Figure 7 is Figure 4The corresponding sectional view shows the state in which the blade is installed.

[0027] Figure 8 It is Figure 7 section VIII-VIII.

[0028] [Explanation of Reference Numerals]

[0029] 1: Reciprocating saw; 11: Main body housing; 111: Opening; 113: Boot-shaped part; 115: Operating rod through-hole; 12: Gear housing; 121: Opening; 13: Support body; 130: Support hole; 131: Sliding bearing; 132: Sliding bearing; 141: Pin; 145: Bearing; 18: Handle; 181: Gripping part; 182: Trigger; 183: Switch; 187: Battery housing; 30: Controller; 31: Motor; 311: Main body part; 315: Motor shaft; 316: Pinion; 4: Driving mechanism; 41: Intermediate shaft; 43: Bevel gear; 45: Crank plate; 451: Crank pin; 455: Connecting part; 5: Slide block; 51: Main body; 52: Blade mounting part; 520: Slit; 521: First hole; 522: Second hole; 523: Groove; 55: Pin connection part; 551: Guide recess; 6: Trajectory mechanism; 61: Cam part; 63: Biasing member; 7: Clamping mechanism; 70: Pin holding hole; 71: Locking pin; 711: Tip end part; 712: Head; 714: Biasing spring; 72: Guide sleeve; 721: First hole; 722: Second hole; 723: Pin; 73: Driving sleeve; 730: Cylinder wall; 731: Base; 732: Cam part; 733: Cam surface; 735: Projection; 737: Retaining ring; 74: Connecting sleeve; 75: Biasing spring; 771: Pusher plate; 775: Biasing spring; 8: Release mechanism; 81: Release drum; 810: Cylinder wall; 811: Projection; 813: Locking part; 83: Operating rod; 85: Biasing spring; 91: Blade (saw blade); 911: Plate surface; 913: Tip of blade (cutting edge); 915: Base end part; 916: Engaging hole; 93: Battery; A1: Long axis; A2: Long axis; P: Plane. Detailed Embodiments

[0030] Next, the reciprocating saw 1 according to the embodiments of the present disclosure will be described with reference to the drawings. Figure 1 The illustrated reciprocating saw 1 is an example of a handheld reciprocating power tool. The reciprocating saw 1 is configured to cut a workpiece (wood, plastic material, steel, etc.) by reciprocating a thin plate-shaped blade 91 that is detachably mounted. In addition, the reciprocating saw may also be referred to as a saber saw.

[0031] First, the schematic structure of the reciprocating saw 1 will be described.

[0032] As shown Figure 1 As shown, the outline of the reciprocating saw 1 is mainly formed by the main body housing 11 and the handle 18.

[0033] The main body housing 11 is a long hollow body extending along a specified long axis A1. A motor 31, a slider 5, a drive mechanism 4 for the slider 5, etc. are housed in the main body housing 11, and the slider 5 can mount a blade 91. An opening 111 is provided at one end of the main body housing 11 in the extending direction of the long axis A1 (hereinafter, also simply referred to as the long axis direction). The opening 111 is disposed on the long axis A1, and the blade 91 mounted on the slider 5 extends to the outside of the main body housing 11 through the opening 111. A boot-shaped portion 113 that abuts against the workpiece during operation is detachably mounted near the opening 111.

[0034] The handle 18 is a hollow body formed in a substantially C shape. The handle 18 is connected to the other end of the main body housing 11 in the long axis direction and forms a ring together with the rear end portion of the main body housing 11. The handle 18 includes a grip portion 181 for the user to hold. The grip portion 181 extends in a direction intersecting the long axis A1 of the main body housing 11 (specifically, a substantially orthogonal direction). A trigger 182 for starting the motor 31 is provided on the grip portion 181. A switch 183 is housed in the grip portion 181. In addition, a battery housing 187 is provided on the handle 18. A rechargeable battery (also referred to as a battery pack) 93 serving as the power source of the reciprocating saw 1 can be detachably attached to the battery housing 187. In addition, although detailed illustrations and descriptions are omitted, the battery housing 187 is a component different from the handle 18 and is connected to the handle 18 via an elastic body. However, instead of the battery housing 187, a battery mounting portion for detachably mounting the battery 93 may be provided at the lower end portion of the handle 18. In addition, a controller 30 is housed in the handle 18.

[0035] When the user presses the trigger 182, the switch 183 is turned on, the motor 31 is energized, and the blade 91 is reciprocated along the long axis direction of the substantially main body housing 11 by the drive mechanism 4.

[0036] Next, the detailed structure of the reciprocating saw 1 will be described. In the following description, for convenience, the extending direction of the long axis A1 of the main body housing 11 is defined as the front-rear direction of the reciprocating saw 1. In the front-rear direction, the side where the opening 111 is provided is defined as the front side of the reciprocating saw 1, and the opposite side (the handle 18 side) is defined as the rear side. The direction orthogonal to the long axis A1 and substantially parallel to the plate surface 911 of the blade 91 mounted on the slider 5 (or, the direction orthogonal to the long axis A1 and substantially corresponding to the extending direction of the grip portion 181) is defined as the up-down direction of the reciprocating saw 1. In the up-down direction, the direction in which the tip 913 of the blade 91 faces during normal use is defined as the down direction, and the opposite direction of the down direction is defined as the up direction. And, the direction orthogonal to the front-rear direction and the up-down direction is defined as the left-right direction of the reciprocating saw 1.

[0037] First, the internal structure of the main body housing 11 will be described.

[0038] As Figure 1 shown, mainly housed inside the main body housing 11 are a motor 31, a drive mechanism 4, a support 13, a slider 5, a track mechanism 6, a clamping mechanism 7, and a release mechanism 8.

[0039] The motor 31 is housed in the rear end portion of the main body housing 11. The motor 31 of the present embodiment is a brushless DC motor. The motor 31 has: a main body portion 311, which includes a stator and a rotor; and a motor shaft 315, which can rotate integrally with the rotor. The motor 31 is configured such that the rotation axis of the motor shaft 315 extends parallel to the long axis A1 of the main body housing 11 (i.e., in the front-rear direction). A pinion 316 is provided at the front end portion of the motor shaft 315. The pinion 316 is a bevel gear. The pinion 316 is formed integrally with the motor shaft 315 and rotates about the rotation axis together with the motor shaft 315.

[0040] In addition, in the present embodiment, the driving of the motor 31 is controlled by a controller 30. Although detailed illustrations are omitted, the controller 30 has a microcomputer including a CPU, a ROM, a RAM, etc. When the switch 183 is turned on, the controller 30 drives the motor 31.

[0041] In the present embodiment, the drive mechanism 4 and the slider 5 are housed inside the main body housing 11 on the front side of the motor 31. In the present embodiment, the drive mechanism 4 and the slider 5 are housed in a gear housing 12. In addition, the gear housing 12 is held in a fixed state inside the main body housing 11. Accordingly, the gear housing 12 can also be understood as a single housing integrated with the main body housing 11. The gear housing 12 is a long and hollow body as a whole, and has an opening 121 at the front end. The slider 5 is supported by the support 13 inside the gear housing 12. The blade 91 mounted on the slider 5 extends to the outside of the gear housing 12 through the opening 121.

[0042] Next, the drive mechanism 4 will be described. The drive mechanism 4 is configured to transmit the rotational power of the motor shaft 315 to the slider 5 to drive the slider 5. As Figure 2 shown, the drive mechanism 4 of the present embodiment includes an intermediate shaft 41, a bevel gear 43, and a crank plate 45.

[0043] The intermediate shaft 41 is disposed inside the lower end of the main body housing 11 (gear housing 12) at a position closer to the front end of the motor shaft 315. The intermediate shaft 41 is supported by two bearings so as to be rotatable. The rotational axis of the intermediate shaft 41 extends in the vertical direction.

[0044] The bevel gear 43 is coaxially mounted on the intermediate shaft 41 and can rotate integrally with the intermediate shaft 41 about the rotational axis of the intermediate shaft 41. The bevel gear 43 is disposed below the motor shaft 315 and meshes with the pinion gear 316. Therefore, the bevel gear 43 rotates together with the intermediate shaft 41 along with the driving of the motor 31.

[0045] The crank plate 45 is a plate-shaped member that is circular when viewed from above, and is disposed coaxially with the intermediate shaft 41 and fixed to the upper side of the intermediate shaft 41. Therefore, the crank plate 45 can rotate integrally with the intermediate shaft 41 about the rotational axis. The crank plate 45 has a crank pin 451. The crank pin 451 is fixed to the crank plate 45 at a position eccentric with respect to the rotational axis and protrudes upward from the upper surface of the crank plate 45. A substantially cylindrical connecting member 455 is disposed around the crank pin 451. The connecting member 455 can rotate about the axis of the crank pin 451 with respect to the crank pin 451.

[0046] Next, the support body 13 will be described. The support body 13 is a long member and is supported so as to extend in a substantially front-rear direction inside the gear housing 12. In the present embodiment, the support body 13 has an upper wall, a left wall, and a right wall, and detailed illustrations thereof are omitted here.

[0047] Sliding bearings (also referred to as plain bearings) 131 and 132 are respectively fixed to the front end and the rear end of the support body 13. The sliding bearings 131 and 132 are coaxially disposed, and the axes of the sliding bearings 131 and 132 define the long axis of the support body 13. The slider 5 is coaxially inserted through the sliding bearings 131 and 132 and is supported by the sliding bearings 131 and 132 so as to be slidable along the long axis of the support body 13. That is, the long axis of the support body 13 (the axes of the sliding bearings 131 and 132) defines the driving axis of the slider 5.

[0048] In addition, the support body 13 is supported in such a manner that it can swing in the vertical direction relative to the gear housing 12. More specifically, the support body 13 is connected to the gear housing 12 via a pin 141. The pin 141 extends in the left - right direction within the gear housing 12, and both end portions thereof are supported by the gear housing 12. The pin 141 is inserted into support holes 130 respectively provided at the lower front end portions of the left wall and the right wall of the support body 13. With such a structure, the support body 13 can swing in the vertical direction about the axis of the pin 141 with the pin 141 as a fulcrum.

[0049] Next, the slider 5 will be described. As Figure 2 and Figure 3 shown, the slider 5 is an elongated member that extends linearly as a whole. The slider 5 is arranged in such a manner that it extends in the substantially front - rear direction within the main body housing 11 (gear housing 12). In the present embodiment, the slider 5 includes a main body 51 and a pin connection portion 55.

[0050] The main body 51 is formed in a cylindrical shape with substantially the same diameter and has a long axis A2. The main body 51 is supported by the sliding bearings 131, 132 of the support body 13 and extends in the substantially front - rear direction. In addition, in the left - right direction, the long axis A2 is located at the same position as the long axis A1 of the main body housing 11. That is, when viewed from above or below, the long axis A1 and the long axis A2 are located at overlapping positions (refer to Figure 4 ). The front end portion of the main body 51 is configured to be able to mount the blade 91. More specifically, a slot 520 is provided at the front end portion of the main body 51, and the slot 520 can removably accommodate the blade 91. The slot 520 extends in the vertical direction from the upper end to the lower end of the main body 51 and opens at the front end of the main body 51. Hereinafter, the front end portion of the main body 51 will also be referred to as the blade mounting portion 52.

[0051] As Figure 4 shown, a first hole 521 and a second hole 522 are formed in the blade mounting portion 52. The first hole 521 extends in the radial direction of the main body 51 in a direction orthogonal to the slot 520 from the left side surface of the blade mounting portion 52 to the slot 520. The first hole 521 is a stepped hole with a circular cross - section. The diameter of the portion of the first hole 521 closer to the long axis A2 (driving axis) of the main body 51 (hereinafter referred to as the small - diameter portion) is smaller than the diameter of the portion on the opening side (left side) (hereinafter referred to as the large - diameter portion). The second hole 522 extends in the radial direction of the main body 51 in a direction orthogonal to the slot 520 from the right side surface of the blade mounting portion 52 to the slot 520. The second hole 522 is a hole with a diameter smaller than that of the first hole 521. The first hole 521 and the second hole 522 are arranged in a straight line.

[0052] Also, a groove 523 is formed on the wall surface at the left end of the specified slit 520 of the main body 51. The groove 523 extends from the front end to the rear end of the slit 520 in a manner parallel to the long axis of the main body 51 at the central portion in the vertical direction of the slit 520. The groove 523 is a groove with a semicircular cross-section.

[0053] The clamping mechanism 7 is connected to the blade mounting portion 52 in an operable manner. The clamping mechanism 7 is configured to fix the blade 91 inserted into the slit 520 to the slider 5. The above-described first hole 521, second hole 522, and groove 523 are all provided for holding the components constituting the clamping mechanism 7. In addition, the clamping mechanism 7 will be described in detail later.

[0054] As Figure 2 and Figure 3 shown, the pin connection portion 55 is provided integrally with the main body 51 at a portion of the main body 51 slightly rearward of the central portion in the front-rear direction. The pin connection portion 55 extends in the left-right direction in a manner orthogonal to the axis of the main body 51 (i.e., the drive axis). The width of the pin connection portion 55 in the left-right direction is larger than the diameter of the main body 51, and the left end portion and the right end portion of the pin connection portion 55 protrude leftward and rightward with respect to the main body 51, respectively. A guide recess 551 recessed upward is formed in the lower portion of the pin connection portion 55. The guide recess 551 extends over the entire length of the pin connection portion 55 in the left-right direction.

[0055] The pin connection portion 55 is connected to the crank pin 451 in an operable manner. More specifically, the upper portion of the crank pin 451 in a state where the connection member 455 is mounted is inserted into the guide recess 551. The width of the guide recess 551 in the front-rear direction is substantially equal to the maximum diameter of the connection member 455. On the other hand, the length of the guide recess 551 in the left-right direction is set to be slightly larger than the diameter of the circular movement locus of the connection member 455 centered on the rotation axis.

[0056] With such a structure, the crank pin 451 can move in the left-right direction within the guide recess 551 in a state where the movement in the front-rear direction with respect to the guide recess 551 is restricted. When the crank plate 45 rotates together with the intermediate shaft 41, the crank pin 451 rotates in a circle around the rotation axis. At this time, only the front-rear direction component in the circular movement of the crank pin 451 is transmitted to the pin connection portion 55, and the slider 5 reciprocates in the substantially front-rear direction along the drive axis with respect to the support body 13. Thus, the crank plate 45 having the crank pin 451 and the pin connection portion 55 of the slider 5 constitute a motion conversion mechanism that converts the rotational motion of the motor shaft 315 into a linear reciprocating motion of the slider 5.

[0057] Next, the locus mechanism 6 will be described. The locus mechanism 6 is configured to cause the blade 91 to move along an elliptical locus path by swinging the slider 5 in the vertical direction during the reciprocating motion of the slider 5. In addition, hereinafter, the movement of the blade 91 along the elliptical locus path will also be referred to as locus motion or locus action.

[0058] In the present embodiment, the locus mechanism 6 causes the blade 91 to perform locus motion by swinging the support body 13 in the vertical direction as the slider 5 moves in the front-rear direction. As Figure 2 and Figure 5 shown, in the present embodiment, the locus mechanism 6 includes a cam portion 61 and a biasing member 63.

[0059] The cam portion 61 is provided on the crank plate 45 described above. The cam portion 61 is an annular portion provided along the outer edge of the crank plate 45 so as to protrude upward from the upper surface of the crank plate 45. The amount of protrusion of the cam portion 61 from the upper surface of the crank plate 45 (that is, the thickness of the cam portion 61 in the vertical direction) varies in the circumferential direction. More specifically, as Figure 2 shown, the upper end surface (cam surface) of the cam portion 61 is configured to be inclined forward with respect to a virtual plane orthogonal to the rotation axis of the intermediate shaft 41 when the thickest portion of the cam portion 61 is located at the rearmost position.

[0060] Hereinafter, as Figure 2 shown, the rotational position of the crank plate 45 when the thickest portion of the cam portion 61 is located at the rearmost position will be referred to as the first rotational position. In addition, as Figure 5 shown, the rotational position of the crank plate 45 when the thinnest portion of the cam portion 61 is located at the rearmost position will be referred to as the second rotational position. Further, when the crank plate 45 is located at the first rotational position, the slider 5 is located at a position slightly forward of the rearmost position in the movable range. In addition, when the crank plate 45 is located at the second rotational position, the slider 5 is located at a position slightly rearward of the foremost position in the movable range.

[0061] The biasing member 63 is disposed between the upper wall of the gear housing 12 and the upper wall of the support body 13. In the present embodiment, the biasing member 63 is a compression coil spring. The biasing member 63 is disposed in a compressed state between the rear end portion of the gear housing 12 and the rear end portion of the support body 13, and always biases the rear end portion of the support body 13 downward with respect to the main body housing 11 (gear housing 12). That is, the biasing member 63 biases the support body 13 in the direction in which the front end portion (blade 91) of the support body 13 swings upward. In addition, although detailed illustrations are omitted, in the present embodiment, two biasing members 63 are provided corresponding to the left end portion and the right end portion of the support body 13.

[0062] In addition, a bearing 145 is sleeved on the outer periphery of the front end portion of a sliding bearing 132 installed at the rear side of a support 13. Further, the bearing 145 is a ball bearing, and the inner ring of the bearing 145 is press-fitted and fixed to the sliding bearing 132. The outer ring of the bearing 145 can rotate relative to the support 13 about the drive axis. In the vertical direction, the rear end portion (a part of a cam portion 61) of a crank plate 45 is disposed directly below the bearing 145. As described above, the rear end portion of the support 13 is urged downward (i.e., in the direction in which the bearing 145 approaches the cam portion 61) by a biasing member 63. Therefore, the bearing 145 is held in a state of abutting against the cam portion 61 of the crank plate 45 from above.

[0063] When the motor 31 is driven while the bearing 145 is in contact with the cam portion 61, as the crank plate 45 rotates, the bearing 145 rotates and moves on the upper end surface (cam surface) of the cam portion 61. As the crank plate 45 rotates, the thickness of the portion of the cam portion 61 in contact with the bearing 145 changes. Therefore, the bearing 145 moves in the vertical direction. More specifically, as Figure 2 shown, when the crank plate 45 is disposed at the first rotation position, the bearing 145 abuts against the thickest portion of the cam portion 61. At this time, the bearing 145 is disposed at the uppermost position within the range of moving up and down while abutting against the cam portion 61. On the other hand, as Figure 5 shown, when the crank plate 45 rotates to the second rotation position, the bearing 145 abuts against the thinnest portion of the cam portion 61. At this time, the bearing 145 is disposed at the lowermost position within the range of moving up and down while abutting against the cam portion 61.

[0064] With such a structure, the support 13 can swing in the vertical direction about a pin 141 according to the rotation of the crank plate 45 (i.e., the reciprocating movement of the slider 5). The blade 91 performs a locus movement of swinging upward while moving forward and swinging downward while moving backward. Therefore, the vertical positional relationship between the longitudinal axis A1 of the main body housing 11 and the longitudinal axis A2 of the slider 5 (main body 51) changes with the reciprocating movement of the slider 5.

[0065] Next, the clamping mechanism 7 will be described.

[0066] As Figures 2 to 4 shown, the clamping mechanism 7 is connected to the front end portion (blade mounting portion 52) of the slider 5 in an operable manner. In the present embodiment, the clamping mechanism 7 mainly includes a locking pin 71, a guide sleeve 72, a drive sleeve 73, a connecting sleeve 74, and a biasing spring 75.

[0067] As Figure 3 , Figure 4 and Figure 6As shown, the locking pin 71 is a cylindrical component as a whole. The portion of the locking pin 71 other than the two end portions in the axial direction has the same diameter. One end portion of the locking pin 71 in the axial direction is formed into a tapered shape that tapers toward the tip. The other end portion of the locking pin 71 in the axial direction is formed to have a larger diameter than the other portions. Hereinafter, the tapered end portion of the locking pin 71 will be referred to as the tip portion 711, and the large-diameter end portion will be referred to as the head portion 712. The tip portion 711 is configured to be engageable with an engagement hole 916 formed in the base end portion 915 (the end portion mounted on the blade mounting portion 52) of the blade 91. The end face of the head portion 712 is formed into a curved surface with a slightly bulging central portion. In the present embodiment, the locking pin 71 is held by the main body 51 of the slider 5 and a guide sleeve 72 mounted on the main body 51 so as to be movable in the radial direction.

[0068] The guide sleeve 72 is a cylindrical component and is disposed around (radially outside) the blade mounting portion 52. More specifically, the guide sleeve 72 has an inner diameter substantially equal to the diameter of the blade mounting portion 52. The guide sleeve 72 is coaxially sleeved on the blade mounting portion 52 and is fixed to the blade mounting portion 52. In addition, the tip of the blade mounting portion 52 extends forward beyond the front end of the guide sleeve 72.

[0069] As Figure 4 shown, the guide sleeve 72 has a first hole 721 and a second hole 722. The first hole 721 and the second hole 722 are formed at positions facing each other across the axis of the guide sleeve 72. That is, the first hole 721 and the second hole 722 are disposed on a straight line extending in the radial direction of the guide sleeve 72. The diameter of the first hole 721 is substantially equal to or slightly larger than the diameter of the first hole 521 of the blade mounting portion 52. The diameter of the second hole 722 is substantially equal to the diameter of the second hole 522 of the blade mounting portion 52.

[0070] The guide sleeve 72 is positioned by a pin 723 inserted into the second hole 722 and the second hole 522 of the blade mounting portion 52, and is connected to the blade mounting portion 52 in a state where it cannot move relative to the slider 5. The first hole 721 of the guide sleeve 72 is disposed radially outside the first hole 521 of the blade mounting portion 52 and communicates with the first hole 521. Hereinafter, the hole formed by the communication of the first hole 521 and the first hole 721 will also be referred to as the pin holding hole 70.

[0071] The locking pin 71 is inserted and held in the pin holding hole 70 with its head 712 disposed on the radially outer side. Further, the diameter of the locking pin 71 is set to be substantially the same as the diameter of the small-diameter portion of the first hole 521 of the blade mounting portion 52. Accordingly, the locking pin 71 can slide radially within the pin holding hole 70 along the small-diameter portion. The length of the locking pin 71 is set such that at least when the tip of the locking pin 71 (the tip of the tip portion 711) exits from the slit 520 (when disposed on the radially outer side), the end face of the head 712 protrudes radially outward from the outer peripheral surface of the guide sleeve 72.

[0072] In addition, a biasing spring 714 is disposed within the pin holding hole 70. The biasing spring 714 is a compression coil spring. The biasing spring 714 is externally fitted to the locking pin 71, and the two end portions of the biasing spring 714 are respectively in contact with the shoulder portion of the first hole 521 (the stepped portion between the small-diameter portion and the large-diameter portion) and the head 712 of the locking pin 71. The biasing spring 714 biases the locking pin 71 radially outward (i.e., in the direction away from the slit 520).

[0073] As Figure 3 , Figure 4 and Figure 6 shown, the drive sleeve 73 is a cylindrical member that is coaxially disposed with the main body 51 of the slider 5 around the guide sleeve 72 and the locking pin 71 (radially outside). The drive sleeve 73 has a cylindrical wall 730 and a single protrusion 735.

[0074] The cylindrical wall 730 is a wall portion that surrounds the guide sleeve 72 and the locking pin 71. The cylindrical wall 730 has substantially the same thickness over the entire circumference. Most of the cylindrical wall 730 (the portion that occupies approximately three-quarters in the circumferential direction) is a wall portion that corresponds to a part of a cylinder centered on the longitudinal axis A2 (drive axis) of the main body 51 (disposed along a part of the circumference of a circle centered on the longitudinal axis A2). Hereinafter, this wall portion will be referred to as the base portion 731.

[0075] On the other hand, the remaining part of the cylindrical wall 730 (the portion that occupies approximately one-quarter in the circumferential direction) is located at a position radially outside the circumference of the circle centered on the longitudinal axis A2. That is, a part of the cylindrical wall 730 in the circumferential direction protrudes radially outward more than the other part (the base portion 731). The inner peripheral surface of this protruding portion is configured to cooperate with the end face of the head 712 of the locking pin 71 to move the locking pin 71 radially as the drive sleeve 73 rotates. Accordingly, hereinafter, this protruding portion of the cylindrical wall 730 will be referred to as the cam portion 732, and the inner peripheral surface of the cam portion 732 will also be referred to as the cam surface 733. The cam portion 732 is configured such that when viewed from the front, the distance (radius) between the axis of the drive sleeve 73 (i.e., the longitudinal axis A2 of the main body 51) and the cam surface 733 gradually increases in the counterclockwise direction ( Figure 6 the direction of the arrow D1 in

[0076] The protrusion 735 protrudes radially outward from a portion of the cylinder wall 730 different from the cam portion 732 (i.e., the base portion 731). Further, the distance from the axis (long axis A2) of the drive sleeve 73 to the tip of the protrusion 735 is longer than the distance from the axis (long axis A2) of the drive sleeve 73 to the outer surface of the most radially outward protruding portion of the cam portion 732. That is, the protruding length of the protrusion 735 with respect to the axis (long axis A2) of the drive sleeve 73 is larger than the maximum protruding length of the cam portion 732. In the present embodiment, the protrusion 735 extends linearly in the front-rear direction from the front end to the rear end of the drive sleeve 73.

[0077] In the present embodiment, the drive sleeve 73 is connected to the main body 51 via a connection sleeve 74 and a biasing spring 75.

[0078] The connection sleeve 74 is configured to connect the drive sleeve 73 to the main body 51 in an operable manner. The connection sleeve 74 is a cylindrical member and is coaxially disposed around (radially outside) the blade mounting portion 52 with the main body 51 of the slider 5. More specifically, the connection sleeve 74 is a bottomed cylindrical member having a bottom wall and a peripheral wall, wherein the bottom wall has a through hole with a diameter substantially the same as the diameter of the blade mounting portion 52, and the peripheral wall projects from the outer edge of the bottom wall. The connection sleeve 74 is sleeved on the blade mounting portion 52 at the rear side of the guide sleeve 72 with the bottom wall disposed at the rear side and the peripheral wall projecting forward. The rear end portion of the guide sleeve 72 is disposed in the cylindrical space formed between the blade mounting portion 52 and the peripheral wall.

[0079] Although detailed illustration is omitted, a plurality of rectangular recesses are formed in the outer peripheral portion of the front end portion of the connection sleeve 74. On the other hand, a plurality of convex portions having shapes adapted to the recesses are provided on the inner peripheral portion of the rear end portion of the drive sleeve 73. The drive sleeve 73 is sleeved on the connection sleeve 74 from the front in such a manner that the convex portions engage with the recesses of the connection sleeve 74. The front end portion (portion forward of the first hole 721) of the guide sleeve 72 projects forward more than the front end of the drive sleeve 73. The drive sleeve 73 is positioned in the front-rear direction by a snap ring 737 fixed to the guide sleeve 72 on the front side of the drive sleeve 73. With this connection structure, the drive sleeve 73 and the connection sleeve 74 are integrated in terms of rotation about the long axis A2 of the main body 51.

[0080] As Figure 2 、 Figure 3 and Figure 4As shown, the biasing spring 75 is a torsion spiral spring. One end portion of the biasing spring 75 extends in the diameter direction of the coil. This one end portion is inserted into and engaged with the slit 520 of the blade mounting portion 52, and is disposed at a position where it abuts against the wall surface at the rear end of the specified slit 520. The other end portion of the biasing spring 75 is inserted into and engaged with the engagement hole provided on the connection sleeve 74. The biasing spring 75 biases the connection sleeve 74 and the drive sleeve 73 integrated with the connection sleeve 74 in the counterclockwise direction ( Figure 6 in the direction of arrow D1) when viewed from the front with respect to the slider 5, the guide sleeve 72, and the locking pin 71.

[0081] That is, the biasing spring 75 biases the drive sleeve 73 to rotate in a direction in which a portion of the cam surface 733 that is closer to the major axis A2 abuts against the head 712 of the locking pin 71. Therefore, the cam surface 733 abuts against the end surface (curved surface) of the head 712, and presses the locking pin 71 radially inward (i.e., the direction in which the tip portion 711 of the locking pin 71 protrudes into the slit 520, the direction in which the locking pin 71 engages with the blade 91). Therefore, the counterclockwise direction when viewed from the front is hereinafter also referred to as the engaging direction.

[0082] In the present embodiment, as Figure 7 and Figure 8 shown, the locking pin 71 engages with the blade 91 at a position where the tip portion 711 engages with the engagement hole 916 of the blade 91 inserted into the slit 520 (i.e., the position where the tip portion 711 protrudes into the slit 520). At this time, as Figure 8 shown, the drive sleeve 73 is disposed at a position where the end portion of the cam surface 733 that is closer to the major axis A2 (i.e., the end portion of the cam surface 733 that is located on the clockwise side when viewed from the front) abuts against the end surface of the head 712. Hereinafter, the position of the locking pin 71 at this time (the position where the locking pin 71 can engage with the blade 91) is referred to as the locking position. In addition, the position of the drive sleeve 73 that positions the locking pin 71 at the locking position is referred to as the engaging position.

[0083] On the other hand, as Figure 6 shown, when the drive sleeve 73 is disposed at a position where the end portion of the cam surface 733 that is farther from the drive axis (i.e., the end portion of the cam surface 733 that is located on the counterclockwise side when viewed from the front) abuts against the end surface of the head 712, the locking pin 71 can withdraw from the slit 520. At this time, the tip portion 711 of the locking pin 71 is disposed radially outside (to the left) of the slit 520. Therefore, the locking pin 71 cannot engage with the blade 91. Hereinafter, the position of the locking pin 71 at this time (the position where the locking pin 71 cannot engage with the blade 91) is referred to as the unlocking position. In addition, the position of the drive sleeve 73 that allows the locking pin 71 to move radially outward to the unlocking position (withdraw from the slit 520) is referred to as the engagement release position.

[0084] As Figure 3 , Figure 4 and Figure 6 shown, in the present embodiment, the clamping mechanism 7 further has a push plate 771 and a biasing spring 775.

[0085] The push plate 771 is engaged with the slit 520 and the groove 523 in a state where it can slide in the front - rear direction along the groove 523. The rear half of the push plate 771 is formed in a substantially D - shaped cross - section so as to be engaged with the groove 523. On the other hand, the front half of the push plate 771 is formed in a rectangular parallelepiped shape having a width substantially the same as that of the slit 520 in the left - right direction and is disposed only within the slit 520. The biasing spring 775 is a compression coil spring. The biasing spring 775 is provided on the rear side of the push plate 771. One end of the biasing spring 775 abuts against one end of the biasing spring 75 disposed at the rear end of the slit 520, and the other end abuts against the rear end of the push plate 771. The push plate 771 moves in the front - rear direction in accordance with the movement of the locking pin 71, which will be described in detail later.

[0086] Next, the release mechanism 8 will be described. The release mechanism 8 is configured to release the clamping (fixing) of the blade 91 by the clamping mechanism 7. As Figure 3 , Figure 4 and Figure 6 shown, the release mechanism 8 of the present embodiment includes a release drum 81 and a biasing spring 85.

[0087] The release drum 81 is a cylindrical member and is disposed around the clamping mechanism 7. In the present embodiment, the release drum 81 includes a cylindrical wall 810, a protrusion 811, and an operating rod 83.

[0088] The cylindrical wall 810 is a cylindrical wall portion having substantially the same diameter. The cylindrical wall 810 is disposed inside the front end portion of the gear housing 12 (the space extending into the gear housing 12 from the opening 121) in such a manner that the axis of the cylindrical wall 810 coincides with the longitudinal axis A1 of the main body housing 11, and is supported by the gear housing 12 so as to be rotatable about the longitudinal axis A1. That is, the longitudinal axis A1 of the main body housing 11 is the rotation axis of the release drum 81. In addition, although detailed illustration is omitted, the axial (front - rear direction) and radial movements of the cylindrical wall 810 (release drum 81) are restricted by ribs provided inside the gear housing 12. The length and arrangement of the cylindrical wall 810 in the front - rear direction are set such that even when the slider 5 is in the rearmost position or when the slider 5 is in the foremost position, the cylindrical wall 810 is located around the drive sleeve 73. That is, the length and arrangement of the cylindrical wall 810 in the front - rear direction are set to completely cover the movable range of the drive sleeve 73 in the front - rear direction.

[0089] The projection 811 projects radially inward from the inner circumferential surface of the cylinder wall 810. The projection 811 is configured to be able to engage (abut) with the projection 735 of the drive sleeve 73. As the release drum 81 rotates, the projection 811 causes the drive sleeve 73 to rotate through the projection 735, which will be described in detail later. In the present embodiment, the projection 811 extends radially to a position approximately in the middle between the outer circumferential surface of the cylinder wall 730 of the drive sleeve 73 and the inner circumferential surface of the release drum 81. On the other hand, the projection 735 extends to a position further radially outward than the middle position between the outer circumferential surface of the cylinder wall 730 of the drive sleeve 73 and the inner circumferential surface of the cylinder wall 810. That is, the protruding length of the projection 735 protruding from the outer circumferential surface of the cylinder wall 730 is greater than the protruding length of the projection 811 protruding from the inner circumferential surface of the cylinder wall 810.

[0090] In addition, the projection 811 extends linearly from the front end to the rear end of the cylinder wall 810 in a direction parallel to the axis (long axis A1) of the cylinder wall 810 (release drum 81) (in the front-rear direction). As described above, the drive sleeve 73 moves in the substantially front-rear direction in accordance with the reciprocating movement of the slider 5. In contrast, by providing the projection 811 over the entire length of the cylinder wall 810, the engagement between the projection 811 and the projection 735 can be achieved regardless of the position of the drive sleeve 73 in the front-rear direction. In addition, the projection 811 only needs to have a length that can engage with the projection 735 regardless of the position of the drive sleeve 73 within the movable range, and may be shorter than the entire length of the cylinder wall 810 in the front-rear direction.

[0091] The operating lever 83 is configured to be manually operable by the user. The operating lever 83 projects radially outward from the outer circumferential surface of the cylinder wall 810. In the present embodiment, the operating lever 83 is formed in a rectangular plate shape, but may have any other shape. In addition, the operating lever 83 is integrally formed with the cylinder wall 810, but may also be formed separately from the cylinder wall 810 and connected to the cylinder wall 810. In the present embodiment, in the circumferential direction of the cylinder wall 810, the operating lever 83 and the projection 811 are located at substantially the same position. In other words, a part of the operating lever 83 and a part of the projection 811 are located on a straight line extending radially along the cylinder wall 810. Accordingly, a reasonable configuration that can easily ensure the strength of the operating lever 83 and the projection 811 can be achieved.

[0092] Openings through which the operating lever 83 can be inserted are respectively formed in the right wall of the front end portion of the main body housing 11 and the right wall of the front end portion of the gear housing 12. The opening of the main body housing 11 and the opening of the gear housing 12 communicate with each other to form an opening through which the operating lever 83 is exposed to the outside (hereinafter referred to as the operating lever insertion hole 115). The operating lever insertion hole 115 is a substantially rectangular opening that is long in the vertical direction. The length of the operating lever insertion hole 115 in the front-rear direction is slightly longer than the length of the operating lever 83 in the front-rear direction. A part of the operating lever 83 protrudes to the right of the main body housing 11 from the operating lever insertion hole 115. Therefore, the user can easily operate the operating lever 83 outside the main body housing 11. The operating lever 83 can move between the lower end portion and the upper end portion of the operating lever insertion hole 115.

[0093] The biasing spring 85 is a tension coil spring. One end portion of the biasing spring 85 is engaged with a locking portion 813 provided on the outer peripheral surface of the release drum 81, and the other end portion is engaged with the gear housing 12, which will be described in detail later.

[0094] The release drum 81 is biased by the biasing spring 85 in the counterclockwise direction ( Figure 6 the direction of arrow D1 when viewed from the front) and is normally held at the position where the operating lever 83 abuts against the lower end of the operating lever insertion hole 115 ( Figure 6 the position shown by the dashed line). Hereinafter, the position of the release drum 81 and the operating lever 83 at this time will be referred to as the initial position. When the operating lever 83 moves upward according to the manual operation of the user, the release drum 81 rotates in the clockwise direction ( Figure 6 the direction of arrow D2 when viewed from the front) against the acting force of the biasing spring 85.

[0095] Next, the operations of the clamping mechanism 7 and the release mechanism 8 will be described.

[0096] First, the state in which the blade 91 is fixed to the slider 5 by the clamping mechanism 7 will be described.

[0097] As Figure 7 and Figure 8 shown, in the state where the blade 91 is fixed to the slider 5 by the clamping mechanism 7, as described above, the locking pin 71 is engaged with the blade 91 at the locking position, and the drive sleeve 73 presses the locking pin 71 against the blade 91 at the engaging position. The push plate 771 is held at the position where it abuts against the rear end of the blade 91. The release drum 81 and the operating lever 83 are held at the initial position where the operating lever 83 abuts against the lower end of the operating lever insertion hole 115.

[0098] In addition, in the present embodiment, as Figure 7 and Figure 8As shown, when the slider 5 is disposed at the rearmost position, on a plane orthogonal to the longitudinal axis A1 of the main body housing 11 and including the axis of the locking pin 71, the longitudinal axis A1 of the main body housing 11 and the longitudinal axis A2 of the main body 51 are in a substantially coincident or slightly offset position. At this position, the protrusion 735 of the drive sleeve 73 is disposed near a straight line extending in the left-right direction along the axis of the locking pin 71 (specifically, at a position slightly above the straight line). That is, the protrusion 735 and the locking pin 71 are substantially located on a straight line extending in the left-right direction. In addition, the protrusion 735 is disposed in the up-down direction at a position corresponding to the approximate center of the operating lever through-hole 115, that is, the approximate center of the movable range of the operating lever 83 and the protrusion 811 in the up-down direction. The protrusion 811 is not engaged with the protrusion 735, but is disposed at a position downwardly separated from the protrusion 735 of the drive sleeve 73.

[0099] The operations of the clamping mechanism 7 and the release mechanism 8 when the blade 91 is removed from the slider 5 will be described.

[0100] The user moves the operating lever 83 disposed at the initial position ( Figure 8 the position shown) upward, causing the release drum 81 to rotate in the clockwise direction (arrow D2 direction) as viewed from the front against the biasing force of the biasing spring 85. Along with this, the protrusion 811 also moves. The release drum 81 reaches a position where the protrusion 811 abuts against the protrusion 735 of the drive sleeve 73 from below ( Figure 8 the position shown by the dashed line). In a state where the protrusion 811 abuts against the protrusion 735, when the release drum 81 further rotates, along with the rotation of the release drum 81, the drive sleeve 73 also rotates in the clockwise direction as viewed from the front. That is, the drive sleeve 73 rotates from the engaged position to the disengaged position. Along with this, the locking pin 71 is biased by the biasing spring 714, abuts against the cam surface 733, and gradually moves radially outward (to the left of the reciprocating saw 1 ( Figure 8 the right in the figure)).

[0101] When the user moves the operating lever 83 upward to Figure 6 the position shown and rotates the release drum 81, the drive sleeve 73 reaches the disengaged position. Hereinafter, the positions of the release drum 81 and the operating lever 83 at this time will be referred to as the release position. The locking pin 71 reaches the unlocked position, and the tip portion 711 disengages from the engagement hole 916 of the blade 91 and is disposed outside the slit 520.

[0102] As the engagement between the locking pin 71 and the blade 91 is released, the push plate 771 is biased by the biasing spring 775, abuts against the rear end of the blade 91, and moves forward. The push plate 771 pushes the blade 91 forward, facilitating the removal of the blade 91. In addition, as shown in Figure 4 andFigure 6 As shown, the push plate 771 abuts against the tip 711 protruding into the groove 523 of the locking pin 71 disposed at the unlocking position from the rear. The front half of the push plate 771 is disposed within the slit 520 on the right side of the tip 711 of the locking pin 71. The cam surface 733 of the drive sleeve 73 biased in the engaging direction (arrow D1 direction) presses the locking pin 71 radially inward, but the front half of the push plate 771 abuts against the tip of the locking pin 71 to prevent the movement of the locking pin 71. Therefore, the drive sleeve 73 is held at the disengaged position.

[0103] In the present embodiment, the rotation angle of the drive sleeve 73 from the engaged position to the disengaged position is approximately 45 degrees. Therefore, even when the drive sleeve 73 is disposed at the disengaged position, the protrusion 735 is not disposed directly above the long axis A1 (the rotation axis of the release drum 81) and the long axis A2. That is, regardless of the position of the drive sleeve 73 between the engaged position and the disengaged position, the protrusion 735 does not coincide with the virtual plane P (refer to Figure 6 ) that includes the long axis A1 and the long axis A2 and extends in the vertical direction. More specifically, the protrusion 735 is always located on the right side of the plane P. In addition, regardless of the position of the drive sleeve 73 between the engaged position and the disengaged position, the cam portion 732 is located on the side opposite to the protrusion 735 with respect to the plane P (always on the left side of the plane P). In addition, the rotation angle of the drive sleeve 73 is approximately half of the rotation angle of the release drum 81, and the drive sleeve 73 rotates corresponding to the substantially latter half of the rotation process of the release drum 81.

[0104] In addition, in the present embodiment, as described above, the slider 5 swings in the vertical direction through the trajectory mechanism 6 during the reciprocating movement. Therefore, the vertical positional relationship between the long axis A1 of the main body housing 11 (i.e., the rotation axis of the release drum 81) and the long axis A2 of the main body 51, and even the vertical position of the drive sleeve 73 (protrusion 735) relative to the release drum 81 change according to the position of the slider 5 in the front-rear direction. However, in the present embodiment, regardless of the position of the slider 5, that is, regardless of the vertical position of the drive sleeve 73 relative to the release drum 81, the above relationship holds between the protrusion 735 and the plane P and between the protrusion 735, the cam portion 732 and the plane P.

[0105] When the user releases the operation of the operating lever 83 (when the hand leaves the operating lever 83), the release drum 81 is biased by the biasing spring 85 (refer to Figure 3)A force is applied to rotate counterclockwise (in the direction of arrow D2) when viewed from the front. In a state where the drive sleeve 73 is held at the engagement release position, the projection 811 does not engage with the projection 735 of the drive sleeve 73 and moves in a direction away from the projection 735, returning to the initial position ( Figure 6 the position indicated by the dashed line in). That is, the release drum 81 does not act on the drive sleeve 73 and rotates from the release position to the initial position.

[0106] The operations of the clamping mechanism 7 and the release mechanism 8 when installing the blade 91 will be described.

[0107] When the blade 91 is inserted into the slit 520 toward the rear, the push plate 771 is pressed by the rear end of the blade 91 and thus moves rearward against the biasing force of the biasing spring 775. As Figure 7 and Figure 8 shown, when the engagement hole 916 of the blade 91 reaches a position facing the tip 711 of the locking pin 71, the drive sleeve 73 rotates in the engagement direction (arrow D1 direction) by the acting force of the biasing spring 75, and the locking pin 71 moves to the locking position. The locking pin 71 is held at the locking position by the drive sleeve 73 disposed at the engagement position. Thus, in the present embodiment, the clamping mechanism 7 operates according to the insertion of the blade 91 into the slit 520 and fixes the blade 91 to the blade mounting portion 52. During this period, the release drum 81 is held at the initial position, the projection 811 does not engage with the projection 735, and the rotation of the drive sleeve 73 is allowed.

[0108] As described above, in the reciprocating saw 1 of the present embodiment, when the release drum 81 rotates from the initial position to the release position according to the manual operation of the operating lever 83, the drive sleeve 73 rotates from the engagement position to the engagement release position, so that the locking pin 71 can move to the unlocking position. The drive sleeve 73 has a cam portion 732 that allows the locking pin 71 to move to the unlocking position. In addition, a projection 735 that can engage with the projection 811 of the release drum 81 is provided on a base portion 731 of the drive sleeve 73 different from the cam portion 732. With such a structure, a sufficient protruding length of the projection 735 required for engaging with the projection 811 is ensured, and an increase in the overall diameter of the drive sleeve 73 including the projection 735 can be suppressed. In addition, by making the number of the projections 811 and 735 only one each, the optimal positions can be selected respectively, and the structures of the release drum 81 and the drive sleeve 73 can be simplified.

[0109] In addition, in the present embodiment, the locus mechanism 6 causes the blade 91 to generate a locus motion, whereby the cutting efficiency can be improved. On the other hand, the locus mechanism 6 causes the slider 5 to swing in the vertical direction during the reciprocating motion. As described above, the positional relationship between the release drum 81 and the drive sleeve 73 in the vertical direction changes.

[0110] Therefore, when a plurality of projections 811 and projections 735 are respectively provided, due to the vertical misalignment between the release drum 81 and the drive sleeve 73, the engagement between at least one of the plurality of projections 811 and at least one of the plurality of projections 735 may become inappropriate. In addition, when the projection 735 is disposed directly above or directly below the long axis A1, the positional relationship between the projection 811 and the projection 735 is more likely to change significantly compared to when it is located at other positions. According to this embodiment, the number of the projections 811 and the projections 735 is one respectively. In addition, no matter which position the drive sleeve 73 is disposed between the engagement position and the disengagement position, the projection 735 is not disposed directly above or directly below the long axis A1. Therefore, the possibility of poor engagement between the projection 811 and the projection 735 can be reduced.

[0111] In addition, in the present embodiment, the projection 811 is disposed at a position substantially the same as that of the operating lever 83 in the circumferential direction of the release drum 81, where the operating lever 83 can move between the lower end and the upper end of the operating lever through-hole 115. And regardless of the position of the slider 5, that is, regardless of the vertical position of the drive sleeve 73 relative to the release drum 81, when the drive sleeve 73 is disposed at the engagement position, the projection 735 is disposed at a position substantially corresponding to the central portion in the vertical direction of the operating lever through-hole 115, that is, disposed at the middle portion of the movement path of the projection 811. In addition, the so-called "middle portion" here is not limited to the strict middle position of the movement path, and may also include a certain range before and after the middle position.

[0112] Therefore, the projection 811 engages with the projection 735 at an intermediate stage during the rotation of the release drum 81 from the initial position to the blade removal position. Therefore, the possibility of interference between the projection 811 and the projection 735 when the release drum 81 is in the initial position (that is, before manually operating the operating lever 83) can be reduced. Such a structure is particularly suitable for the case where the release drum 81 and the drive sleeve 73 are vertically misaligned as in the present embodiment.

[0113] The following shows the correspondence between the components of the present embodiment and the components of the present disclosure or the present invention. However, each component of the embodiment is only an example and does not limit the components of the present disclosure.

[0114] The reciprocating saw 1 is an example of a "reciprocating power tool". The main body housing 11 is an example of a "housing". The release drum 81 is an example of a "first cylindrical member". The operating lever 83 and the protrusion 811 are an example of an "operating part" and a "first protrusion", respectively. The long axis A1 is an example of a "first axis". The initial position and the release position of the release drum 81 are an example of a "first position" and a "second position", respectively. The slider 5 is an example of a "slider". The front end portion (blade mounting portion 52) of the slider 5 is an example of a "first end portion". The long axis A2 is an example of a "second axis". The blade 91 is an example of a "blade". The drive sleeve 73 is an example of a "second cylindrical member". The protrusion 735 is an example of a "second protrusion". The engagement position and the disengagement position of the drive sleeve 73 are an example of an "engagement position" and a "disengagement position", respectively. The locking pin 71 is an example of a "locking member". The locking position and the unlocking position are an example of a "locking position" and an "unlocking position", respectively. The cam portion 732 is an example of a "projecting portion". The plane P is an example of a "first plane". The operating lever through-hole 115 is an example of an "opening".

[0115] In addition, the above-described embodiments are merely examples, and the reciprocating power tool according to the present disclosure is not limited to the illustrated reciprocating saw 1. For example, the following illustrated changes can be added. In addition, these changes can be adopted by combining at least one of these changes with the reciprocating saw 1 shown in the embodiment or the features described in each technical solution.

[0116] For example, the reciprocating power tool of the present disclosure can also be configured as a wire saw. The reciprocating saw 1 can also operate using electric power supplied from an external AC power source via a power cord instead of using the battery 93. The motor 31 can also be an AC motor. In addition, the motor 31 can also be a motor having brushes.

[0117] The mechanism for reciprocating the blade 91 is not limited to the drive mechanism 4. Any known mechanism can be adopted as long as it can convert the rotational motion of the motor shaft 315 into a linear reciprocating motion and transmit it to the blade 91. For example, the motion conversion can also be achieved by using a swinging member (so-called swash bearing) that swings as a rotating body rotates. In addition, the crank pin of the crank plate can be connected to the slider 5 through a connecting rod. The combination and configuration of various shafts and gears can also be appropriately changed.

[0118] Similarly, the mechanism for causing the blade 91 to perform a locus motion is not limited to the locus mechanism 6. As long as it can act on the support body 13 or the slider 5 to cause the blade 91 to perform a locus motion, any known mechanism can be adopted. For example, a member that is connected to the support body 13 in an operable manner and causes the support body 13 to swing can also be provided separately from the crank plate 45. In addition, a switching mechanism (a mechanism that selectively switches multiple operation modes) for changing the operation of the locus mechanism 6 can also be provided. "Changing the operation of the locus mechanism" includes, for example, prohibiting the operation of the locus mechanism and changing the swing amount (i.e., changing the locus path of the locus motion of the blade) of the slider swinging through the locus mechanism. Any known mechanism can be adopted for such a switching mechanism. In addition, the locus mechanism 6 can also be omitted. That is, the slider 5 can also reciprocate in the front-rear direction along the long axis A1 of the main body housing 11 only through the drive mechanism 4.

[0119] In addition, the arrangement of the motor 31, the drive mechanism 4, and the slider 5 in the main body housing 11 is not limited to the examples of the above-described embodiments. For example, the motor 31 can also be arranged such that the rotation axis of the motor shaft 315 intersects the long axis A1 of the main body housing 11. The crank plate 45 is configured to be rotatable about a rotation axis extending in the left-right direction, and the slider 5 can also be arranged on the right or left side of the crank plate 45.

[0120] The shape, constituent components, connection method, etc. of the main body housing 11 and the handle 18 are not particularly limited and can be appropriately changed. Similarly, for the gear housing 12 arranged inside the main body housing 11, it can also be appropriately changed according to the change of the drive mechanism 4, the slider 5, etc. arranged inside the gear housing 12 or regardless of the change. In addition, a housing having a structure in which the gear housing 12 is exposed to the outside can also be adopted.

[0121] The shape, constituent components, connection method with the drive mechanism 4, etc. of the slider 5 are not particularly limited and can be appropriately changed. For example, the slider 5 may not be cylindrical but, for example, prismatic. The slider 5 can also be formed by connecting multiple components. In addition, the support structure of the slider 5 is not limited to the structure based on the support body 13. For example, when the locus mechanism 6 is omitted, the slider 5 only needs to be supported by the gear housing 12 (or a component arranged in the gear housing 12) so as to be movable only in the front-rear direction.

[0122] The structures of the clamping mechanism 7 and the release mechanism 8 can be appropriately changed. Hereinafter, modified examples that can be adopted are exemplified.

[0123] For example, the clamping mechanism 7 may include at least a driving sleeve 73 and a locking pin 71. Among them, the driving sleeve 73 is connected to the front end of the slider 5 in a manner that can rotate around the long axis A2, and the locking pin 71 can move between a locking position where it can engage with the blade 91 and an unlocking position where it cannot engage with the blade 91 according to the rotation of the driving sleeve 73 between the engaging position and the disengaging position. That is, other components (such as the biasing spring 714, the guiding sleeve 72, the connecting sleeve 74, the biasing spring 75, the push plate 771, etc.) can be appropriately omitted or replaced with other components. In addition, the respective shapes, configurations, connection methods with other components, etc. of the components constituting the clamping mechanism 7 can be appropriately changed.

[0124] For example, the locking pin 71 may not be cylindrical but prismatic. For example, balls may be used instead of the locking pin 71. The cam portion 732 of the driving sleeve 73 can be changed to a shape corresponding to the changed locking pin 71 or the ball. The driving sleeve 73 can also be directly biased by the biasing spring 75 without passing through the connecting sleeve 74. The biasing springs 714, 75, 775 used in the clamping mechanism 7 can also be springs of different types from the springs exemplified. For example, as the biasing spring 75, a compression coil spring, a tension coil spring, or a leaf spring can be used instead of the torsion coil spring. The arrangement positions and locking methods of the biasing springs 714, 75, 775 can be appropriately changed according to the above changes or regardless of the changes.

[0125] The release drum 81 does not necessarily have to be configured to completely cover the movable range of the driving sleeve 73 in the front-rear direction. For example, the barrel wall 810 can also be configured to cover the periphery of the driving sleeve 73 only when the slider 5 is disposed at a specific position (for example, the rearmost position, the foremost position) within the movable range in the front-rear direction. The biasing spring 85 can also be a torsion coil spring, a compression coil spring, or a leaf spring instead of the tension coil spring. The arrangement position and locking method of the biasing spring 85 can be appropriately changed according to this change or regardless of the change.

[0126] The protrusion 735 of the driving sleeve 73 only needs to be provided at a portion different from the cam portion 732 (the base portion 731), and it can also be offset in the clockwise or counterclockwise direction from the exemplified position in the embodiment when viewed from the front. However, when the reciprocating saw 1 has a locus mechanism 6 (in the case of an operation mode that generates the locus movement of the blade 91), it is preferable that the protrusion 735 is always located at a position that does not overlap with the above-mentioned plane P regardless of the position of the driving sleeve 73.

[0127] In addition, the structure (shape, length, thickness, etc.) and arrangement of the protrusion 735 of the drive sleeve 73 and the protrusion 811 of the release drum 81 can be appropriately changed within the range where the protrusion 735 and the protrusion 811 can engage with each other during the rotation of the release drum 81 from the initial position to the release position, and the protrusion 811 does not hinder the rotation of the drive sleeve 73 when the release drum 81 is in the initial position. For example, contrary to the example of the above-described embodiment, the protrusion 811 can be formed longer than the protrusion 735. In addition, when the reciprocating saw 1 has a locus mechanism 6 (in the case of an operation mode that generates a locus motion of the blade 91), it is preferable that the protrusion 735 and the protrusion 811 are separated when the drive sleeve 73 is disposed at the engagement position and the release drum 81 is disposed at the initial position.

[0128] The positional relationship between the operating lever 83 and the protrusion 811 in the release drum 81 is not limited to the example of the above-described embodiment. For example, the operating lever 83 and the protrusion 811 can also be disposed at different positions (i.e., separated in the circumferential direction) in the circumferential direction of the cylinder wall 810. In addition, the position and shape of the operating lever through hole 115 can be appropriately changed. The movable range of the operating lever 83 (i.e., the rotation angle of the release drum 81), and the arrangement of the operating lever 83 and the protrusion 811 can also be changed according to the change of the operating lever through hole 115.

[0129] Moreover, in view of the gist of the present invention, the above-described embodiment, and its modification examples, the following modes are constructed. At least one of the following modes can be used in combination with at least one of the above-described embodiments, their modifications, and the inventions described in each technical solution.

[0130] [Mode 1]

[0131] The tip of the second protrusion extends more radially outward than the intermediate position between the inner circumferential surface of the first cylindrical member and the outer circumferential surface of the second cylindrical member.

[0132] [Mode 2]

[0133] The distance from the second axis to the tip of the second protrusion is longer than the distance from the second axis to the outer surface of the most radially outward protruding portion of the protrusion.

[0134] [Mode 3]

[0135] The second cylindrical member has a cylinder wall that has a substantially uniform thickness and surrounds the second axis, and the protrusion is a part of the cylinder wall.

[0136] [Mode 4]

[0137] The remaining portion of the second cylindrical member other than the protrusion forms a part of a cylinder centered on the second axis.

[0138] [Mode 5]

[0139] The reciprocating power tool further includes a first spring that biases the first cylindrical member toward the first position.

[0140] [Mode 6]

[0141] The reciprocating power tool further has a second spring that biases the second cylindrical member toward the engaged position.

[0142] [Mode 7]

[0143] The reciprocating power tool further has a third spring that biases the locking member toward the unlocked position.

Claims

1. A reciprocating power tool, characterized in that, it has a housing, a first cylindrical member, a slider, a second cylindrical member, and a locking member, wherein, the first cylindrical member is supported by the housing so as to be rotatable about a first axis between a first position and a second position, the first axis defines the front-rear direction of the reciprocating power tool, the first cylindrical member has an operation portion that can be manually operated outside the housing and a single first protrusion protruding radially inward of the first cylindrical member, the slider is an elongated slider having a second axis, having a first end portion to which a blade can be detachably attached, and is supported by the housing so as to be reciprocable along the second axis in substantially the front-rear direction, the second cylindrical member is connected to the first end portion so as to be rotatable about the second axis between an engaged position and a disengaged position, and is disposed inside the first cylindrical member, the second cylindrical member has a single second protrusion protruding radially outward of the second cylindrical member, the locking member is disposed inside the second cylindrical member, and can move radially along the second cylindrical member between a locked position where it can engage with the blade and an unlocked position where it cannot engage with the blade according to the rotation of the second cylindrical member between the engaged position and the disengaged position, in the circumferential direction around the second axis, a part of the second cylindrical member forms a protruding portion that protrudes radially outward more than the rest of the portion, and the protruding portion is configured to allow the locking member to move to the unlocked position, the first protrusion is configured such that, during the rotation of the first cylindrical member from the first position to the second position according to the manual operation of the operation portion, the first protrusion engages with the second protrusion to rotate the second cylindrical member from the engaged position to the disengaged position, and when the first cylindrical member is in the first position, the first protrusion does not engage with the second protrusion and allows the second cylindrical member to rotate, the second protrusion is provided at a portion of the second cylindrical member different from the protruding portion, the slider is configured such that, during the reciprocating movement along the second axis in substantially the front-rear direction, the slider swings in the up-down direction orthogonal to the first axis to cause the blade to perform a locus movement, the second protrusion is configured such that it moves within a range not overlapping with a first plane according to the rotation of the second cylindrical member between the engaged position and the disengaged position regardless of the position of the second cylindrical member, wherein the first plane is a plane that includes the first axis and extends in the up-down direction.

2. The reciprocating power tool according to claim 1, characterized in that, The protrusion and the second protrusion are configured such that, regardless of the position of the second cylindrical member between the engaged position and the disengaged position, the protrusion and the second protrusion are located at positions opposite to each other with respect to the first plane.

3. The reciprocating power tool according to claim 1 or 2, characterized in that When the second cylindrical member is disposed at the engaged position, the second protrusion is disposed at an intermediate portion of the movement path of the first protrusion when the first cylindrical member rotates from the first position to the second position.

4. The reciprocating power tool according to claim 1 or 2, characterized in that The operation portion protrudes radially outward of the first cylindrical member, The first protrusion is circumferentially disposed at a position substantially the same as that of the operation portion on the first cylindrical member.

5. The reciprocating power tool according to claim 4, characterized in that The housing has an opening that extends in the vertical direction orthogonal to the first axis and exposes the operation portion to the outside of the housing, The operation portion can be moved manually between the lower end portion and the upper end portion of the opening, When the second cylindrical member is disposed at the engaged position, the second protrusion is disposed at a position substantially corresponding to the central portion in the vertical direction of the opening.

6. The reciprocating power tool according to claim 1 or 2, characterized in that The first protrusion is configured to engage with the second protrusion in accordance with the rotation of the first cylindrical member from the first position to the second position regardless of the position of the slider in the front-rear direction.

7. A reciprocating power tool, characterized in that It includes a housing, a first cylindrical member, a slider, a second cylindrical member, and a locking member, wherein The first cylindrical member is supported by the housing so as to be rotatable about a first axis between a first position and a second position. The first axis defines the front-rear direction of the reciprocating power tool. The first cylindrical member has an operation portion that can be manually operated outside the housing and a single first protrusion that protrudes radially inward of the first cylindrical member. The slider is an elongated slider having a second axis. It has a first end portion to which a blade can be detachably attached, and is supported by the housing so as to be reciprocally movable along the second axis in substantially the front-rear direction. The second cylindrical member is connected to the first end portion so as to be rotatable about the second axis between an engaged position and a disengaged position, and is disposed inside the first cylindrical member. The second cylindrical member has a single second protrusion that protrudes radially outward of the second cylindrical member. The locking member is disposed inside the second cylindrical member, and can move radially along the second cylindrical member between a locked position where it can engage with the blade and an unlocked position where it cannot engage with the blade in accordance with the rotation of the second cylindrical member between the engaged position and the disengaged position. In the circumferential direction around the second axis, a part of the second cylindrical member forms a protruding portion that protrudes radially outward more than the remaining part, and the protruding portion is configured to allow the locking member to move to the unlocking position. The housing has an opening that extends in the up-and-down direction orthogonal to the first axis and exposes the operation portion to the outside of the housing. The operation portion protrudes radially outward of the first cylindrical member and can be moved manually between the lower end portion and the upper end portion of the opening. The first protrusion is disposed in the circumferential direction of the first cylindrical member at a position substantially the same as that of the operation portion. The first protrusion is configured such that, during the rotation of the first cylindrical member from the first position to the second position according to the manual operation of the operation portion, the first protrusion engages with the second protrusion to rotate the second cylindrical member from the engaged position to the disengaged position, and when the first cylindrical member is in the first position, the first protrusion does not engage with the second protrusion and allows the second cylindrical member to rotate. The second protrusion is provided in a portion of the second cylindrical member different from the protruding portion. When the second cylindrical member is disposed in the engaged position, the second protrusion is disposed at a position substantially corresponding to the central portion in the up-and-down direction of the opening.

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