JP2016101637A - Work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve workability when mutually rotatably connecting an attaching-detaching lever and a boss part.SOLUTION: A jig saw comprises an operation mechanism storage part 14 and an attaching-detaching lever 26 mutually rotatably connected via a screw member 27, and comprises a torsion coil spring 49 for extending in the same direction as the center line A1 of the screw member 27 and also energizing the attaching-detaching lever 26 in the rotational direction to a boss part 25 of the operation mechanism storage part 14, an outer surface 36a of a projection 36 provided in the boss part 25 and engaged with an end part 51 of the torsion coil spring 49, a support groove 43 provided on the attaching-detaching lever 26 and engaged with an end part 50 of the torsion coil spring 49, a screw member 27 for moving the attaching-detaching lever 26 toward the boss part 25 in the same direction as the center line A1 and connecting the attaching-detaching lever 26 to the boss part 25 and an inclined plane 37 provided in the boss part 25 and guiding the end part 51 toward the outer surface 36a before the end part 51 engages with the outer surface 36a of the projection 36.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a working machine including a first member and a second member that are rotatably connected to each other.

  In general, a work machine includes a motor provided in a housing and a work tool held in the housing, and performs work by operating the work tool with the power of the motor. An example of this working machine is described in Patent Document 1. The working machine described in Patent Document 1 is a jigsaw that cuts an object, and the jigsaw cuts the object as a first member that houses a motor, a plunger that is operably provided in the housing, and the object. And a blade as a working tool to be attached to the plunger.

  A tool support mechanism for attaching the work tool to the plunger is provided, and the blade is attached to and detached from the plunger via the tool support mechanism. In addition, a detachable lever that is a second member that is rotatable about the rotation axis of the housing is provided. The detachable lever is biased in the rotational direction by a biasing member such as a torsion coil spring. In the working machine described in Patent Document 1, when the operator operates the detachable lever to rotate the detachable lever from the fixed position against the urging force of the urging member, the fixing force of the tool support mechanism with respect to the blade Is released and the blade can be removed from the plunger. Further, when the operating force applied to the detachable lever by the operator is released, the detachable lever is rotated by the urging force of the urging member to return to the fixed position, the fixing force of the tool support mechanism is increased, and the blade becomes the plunger. Fixed. The detachable lever is held at a fixed position by the urging force of the urging member.

JP 2004-1363 A

  However, the working machine described in Patent Document 1 has no description regarding the mounting structure of a biasing member that biases the detachable lever, and the workability when the lever and the housing are rotatably connected may be reduced. was there.

  The objective of this invention is providing the working machine which improved the workability | operativity in the case of connecting a 1st member and a 2nd member so that rotation is possible.

  The present invention is a working machine having a first member and a second member that are rotatably connected to each other via a rotation shaft, and extends in a center line direction of the rotation shaft, and the second member. Is provided on the first member or the second member, and the first end portion of the torsion coil spring is engaged with the first member. Of the first torsion coil spring and the second member or the first member of the first member where the first engagement portion is not provided, and the second end of the torsion coil spring is engaged A second engaging portion, a connecting member that moves the second member along the center line in a direction approaching the first member, and connects the second member to the first member; Before the first end engages with the first engagement portion, the first end is directed to the first engagement portion. Having a guide portion for guiding Te.

  In the present invention, when the second member is moved toward the first member in the same direction as the center line, the first end portion of the torsion coil spring is guided along the guide portion and engaged with the first engagement portion. Therefore, workability in the case where the first member and the second member are rotatably connected is improved.

It is a perspective view of the jigsaw which is Embodiment 1 of the working machine of the present invention. FIG. 2 is a partial exploded perspective view of the jigsaw of FIG. 1. It is a bottom view which shows the boss | hub part of the jigsaw of FIG. It is sectional drawing in the IV-IV line of FIG. (A), (B) is sectional drawing in the VV line | wire of FIG. (A), (B) is a top view of the attachment / detachment lever shown in FIG. FIG. 2 is a partial exploded perspective view of the jigsaw of FIG. 1. (A), (B) is a partial side view of the jigsaw of FIG. (A), (B) is a partial side view of the jigsaw of FIG. (A) is a partial side view of the saver saw which is Embodiment 2 of the working machine of this invention, (B) is a partial side sectional view of a saver saw.

  Hereinafter, an embodiment of a working machine of the present invention will be described in detail based on the drawings.

(Embodiment 1)
1 to 9 show Embodiment 1 of the working machine of the present invention. The working machine shown in FIG. 1 is a jigsaw 10 that performs an operation of cutting an object, and the jigsaw 10 includes a housing 11. The housing 11 is provided in the motor housing portion 13 housing the electric motor 12, the operation mechanism housing portion 14 continuing to the motor housing portion 13, and the operation mechanism housing portion 14, and the rotational force of the electric motor 12 is applied to the plunger 15. A reciprocating mechanism 16 that converts the reciprocating force into a reciprocating force, a grip 17 and a motor housing portion 13 and an operating mechanism housing portion 14 that are continuous with each other. In addition, a cover 46 is provided to cover the outer surface of the operation mechanism accommodating portion 14. The electric motor 12 generates a rotational force when a voltage is applied from a power source. The power source may be either a DC power source or an AC power source.

  An operation button 18 is provided on the grip 17, and when an operator operates the operation button 18, a voltage is applied to the electric motor 12 and the output shaft of the electric motor 12 rotates. Moreover, the base part 20 is provided in the motor accommodating part 13 via the connection part 19, and an operator presses the base part 20 against a target object and performs the operation | work which cut | disconnects a target object. The connection unit 19 is provided with a mode switching lever 21, and the operator can change the rotation speed of the electric motor 12 by operating the mode switching lever 21.

  As the reciprocating mechanism 16, for example, a cam mechanism or a crank mechanism is used. A tool support mechanism 22 is provided at the end of the plunger 15 connected to the reciprocating mechanism 16. The plunger 15 reciprocates in the vertical direction in FIG. 1, and the tool support mechanism 22 is disposed between the operation mechanism accommodating portion 14 and the base portion 20 in the operation direction of the plunger 15.

  The tool support mechanism 22 generates and releases a fixing force that fixes the blade 23 as a work tool to the plunger 15. The tool support mechanism 22 is operable with respect to the plunger 15, specifically, is rotatable. When the tool support mechanism 22 is in a fixed position in the rotation direction, the tool support mechanism 22 has a fixing force for fixing the blade 23 to the plunger. Occur. On the other hand, when the tool support mechanism 22 is rotated in a predetermined direction from the fixed position to the release position, the tool support mechanism 22 releases the fixing force. The tool support mechanism 22 has a cylindrical shape, and is provided with a protrusion 24 that protrudes radially outward from the outer peripheral surface of the tool support mechanism 22.

  A boss portion 25 and a wall 47 are provided at the end of the operation mechanism accommodating portion 14, and the wall 47 is fixed in a state of being in contact with the connection portion 19. The wall 47 and the boss portion 25 are arranged so as to be at right angles to each other. A detachable lever 26 is provided on the boss portion 25. The detachable lever 26 is connected to the boss portion 25 so as to be rotatable about a screw member 27. The boss portion 25 includes a recess 29 that opens to the end face 28, and a female screw hole 30 that continues to the recess 29. The recess 29 and the female screw hole 30 are arranged concentrically around the center line A1. Moreover, the recessed part 29 and the internal thread hole 30 are arrange | positioned in the location removed from the location where the plunger 15 is arrange | positioned by the bottom view of the boss | hub part 25. FIG.

  The inner diameter of the recess 29 is larger than the inner diameter of the female screw hole 30. The screw member 27 includes a head portion 31, a shaft portion 32 that continues to the head portion 31, and a male screw portion 33 that continues to the shaft portion 32. The male screw portion 33 meshes with the female screw hole 30, and the screw member 27 attaches the detachable lever 26 to the boss portion 25. The outer diameter of the shaft portion 32 is smaller than the inner diameter of the recess 29 and larger than the inner diameter of the female screw hole 30. Further, the outer diameter of the head portion 31 is larger than the outer diameter of the shaft portion 32. Furthermore, the length of the shaft portion 32 in the direction of the center line A1 is larger than the depth of the concave portion 29 in the direction of the center line A1.

  As shown in FIG. 5B, the end surface 34 of the shaft portion 32 is in contact with the bottom surface 35 of the recess 29 in a state where the screw member 27 is fixed to the boss portion 25, and the length direction of the shaft portion 32 is one. The part is located in the recess 29. Further, a part in the length direction of the shaft portion 32 and the head portion 31 are located outside the recess 29. Further, as shown in FIGS. 3 and 4, a protrusion 36 is provided that protrudes from the end face 28 of the boss portion 25 in the direction of the center line A1. The protrusion 36 is disposed outside the recess 29 in the radial direction with the center line A1 as the center. An inclined surface 37 is provided at the tip of the protrusion 36. The inclined surface 37 is inclined in a direction intersecting with the end surface 28. The end face 28 is a plane perpendicular to the center line A1.

  The detachable lever 26 is made of synthetic resin or metal, and the detachable lever 26 is curved in a direction away from the wall 47 in a bottom view of the boss portion 25. That is, the detachable lever 26 is curved in a C shape. A support hole 39 is provided in the first end portion 38 of the detachable lever 26. The support hole 39 includes a first housing portion 40, a constricted portion 41 that continues to the first housing portion 40, and a second housing portion 42 that continues to the constricted portion 41. The inner diameter of the first housing part 40 is larger than the outer diameter of the shaft part 32.

  In addition, a support groove 43 that is continuous with the first accommodating portion 40 is provided. The support groove 43 is connected to the outside in the radial direction of the first housing portion 40. The depth of the support groove 43 in the direction of the center line A1 exceeds half the width of the detachable lever 26 in the direction of the center line A1. The inner diameter of the constricted portion 41 is smaller than the inner diameter of the first housing portion 40 and larger than the outer diameter of the shaft portion 32. Further, the inner diameter of the second accommodating portion 42 is larger than the inner diameter of the constricted portion 41 and the outer diameter of the head portion 31. A second end 44 is provided opposite to the first end 38 in the length direction of the detachable lever 26, and a contact arm 45 is provided on the second end 44. The contact arm 45 is curved in a C shape so as to approach the wall 47. In addition, a push arm 48 extending from the contact arm 45 in the direction of the center line A1 is provided. The push arm 48 is extended from the contact arm 45 in a direction away from the boss portion 25.

  A torsion coil spring 49 is wound around the shaft portion 32, and the torsion coil spring 49 is accommodated in the first accommodating portion 40. The torsion coil spring 49 is made of metal, and generates a repulsive force in response to a load in the circumferential direction around the center line A1, that is, a torsional moment. The torsion coil spring 49 receives a compressive load in the direction of the center line A1 and generates a repulsive force. That is, the torsion coil spring 49 also serves as a compression spring. As shown in FIG. 3, the end portion 50 of the torsion coil spring 49 is disposed in the support groove 43, and the end portion 51 of the torsion coil spring 49 is pressed against the outer surface 36 a of the protrusion 36. The support groove 43 positions and fixes the end portion 50 in the circumferential direction around the center line A1.

  When the end 50 is disposed in the support groove 43 and the end 51 is pressed against the outer surface 36a of the protrusion 36, the protrusion 36 is centered on the center line A1 in FIG. It is arrange | positioned between the edge part 50 and the edge part 51 in the circumferential direction. The torsion coil spring 49 receives a torsional moment and generates a repulsive force in a state where the end 50 is disposed in the support groove 43 and the end 51 is pressed against the outer surface 36 a of the protrusion 36. For this reason, the detachable lever 26 shown in FIG. 3 receives a clockwise urging force, that is, a rotational force around the screw member 27. In FIG. 3, which is a bottom view of the boss portion 25, the inclined surface 37 is disposed behind the contact portion between the outer surface 36 a of the protrusion 36 and the end portion 51 in the urging direction acting on the detachable lever 26.

  Then, the contact arm 45 comes into contact with the wall 47 and the detachable lever 26 is stopped. When the contact arm 45 contacts the wall 47 and the attachment / detachment lever 26 is stopped, that is, when the attachment / detachment lever 26 is in the initial position, the push arm 48 is separated from the protrusion 24 as shown in FIG. . Therefore, the tool support mechanism 22 is in a fixed position in the rotation direction, and generates a fixing force that fixes the blade 23 to the plunger 15.

  On the other hand, when the operator applies an operating force to the detachable lever 26, the detachable lever 26 rotates counterclockwise in FIG. 3 against the repulsive force of the torsion coil spring 49, and the contact arm 45 moves from the wall 47. Leave. The operation of the detachable lever 26 rotating counterclockwise in FIG. 3 appears as the operation of the detachable lever 26 rotating clockwise in FIG. When the detachable lever 26 is rotated clockwise from the position of FIG. 6A, the push arm 48 comes into contact with the protrusion 24, and the turning force of the detachable lever 26 is transmitted to the tool support mechanism 22. It rotates clockwise from the position of 6 (A) to the position of FIG. 6 (B). For this reason, the fixing force applied to the blade 23 is released. Therefore, the operator can remove the blade 23 from the plunger 15. Further, another blade 23 can be newly attached to the plunger 15.

  Thereafter, when the operating force applied to the detachable lever 26 by the operator is reduced, the detachable lever 26 is rotated counterclockwise in FIG. 6 by the repulsive force of the torsion coil spring 49. Then, the push arm 48 is separated from the projection 24 as shown in FIG. 6A, and the contact arm 45 comes into contact with the wall 47 as shown in FIG. 3, and the detachable lever 26 stops at the initial position.

  Therefore, the blade 23 is fixed by the fixing force of the tool support mechanism 22. When the contact arm 45 contacts the wall 47 as shown in FIG. 3 and the detachable lever 26 is stopped at the initial position, the detachable lever 26 receives the repulsive force of the torsion coil spring 49. For this reason, it is possible to prevent the attachment / detachment lever 26 from rotating about the screw member 27 due to vibration generated when the plunger 15 and the blade 23 are reciprocated by the rotational force of the electric motor 12. That is, the detachable lever 26 can be held at the initial position, and the detachable lever 26 can be suppressed from vibrating with respect to the operation mechanism accommodating portion 14, and the generation of noise due to vibration can be suppressed.

  Next, an operation for attaching the detachable lever 26 to the boss portion 25 will be described. This work can also be grasped as a method or a process. First, the operator puts the end portion 50 into the support groove 43, closes the torsion coil spring 49 and the detachable lever 26 toward each other in the direction of the center line A <b> 1, and arranges the torsion coil spring 49 in the support hole 39. In a state where the torsion coil spring 49 is inserted into the support hole 39, the end 51 is located outside the support hole 39.

  Next, the operator holds the recess 29, the support hole 39, and the screw member 27 concentrically with each other about the center line A1. The operator moves the screw member 27 in the direction of the center line A1 and inserts it into the support hole 39, and inserts the male screw portion 33 into the recess 29 and stops. When the screw member 27 is stopped, the end 51 is in contact with the inclined surface 37 as indicated by a broken line in FIGS. 3 and 4 and as shown in FIG. The torsion coil spring 49 has not received a compressive load at this time, and has not received a torsional moment.

  The operator rotates the screw member 27 around the center line A1 using a screwdriver. The direction in which the screw member 27 is rotated is clockwise in FIG. Then, the male screw portion 33 enters the female screw hole 30 and is tightened while meshing with the female screw hole 30 as shown in FIG. As tightening of the screw member 27 proceeds, the torsion coil spring 49 receives a compressive load and generates a repulsive force in the direction of the center line A1.

  When a repulsive force in the direction of the center line A1 is generated in the torsion coil spring 49, the force with which the end 51 is pressed against the inclined surface 37 increases, and the end 51 is a component force with which the end 51 is pressed against the inclined surface 37. An attempt is made to move in a direction intersecting the center line A1. For this reason, the torsion coil spring 49 receives a torsional moment and generates a repulsive force in the circumferential direction. When the component force applied to the end 51 becomes larger than the circumferential repulsive force generated by the torsion coil spring 49, the end 51 approaches the end surface 28 while being in contact with the inclined surface 37, as shown in FIG. 8B. In addition, the end portion 51 moves to the end of the inclined surface 37.

  Next, as the screw member 27 is tightened, the end portion 51 is separated from the inclined surface 37, and the end portion 51 pressed in the direction of the center line A1 is pressed against the end surface 28 as shown in FIG. When the end 51 is pressed against the end face 28, the torsion coil spring 49 receives a torsional moment and generates a repulsive force in the circumferential direction around the center line A1. For this reason, the end 51 is pressed against the outer surface 36a of the protrusion 36 as shown in FIG.

  When the end surface 34 of the shaft portion 32 comes into contact with the bottom surface 35 of the recess 29 as shown in FIG. 5B, the tightening of the screw member 27 is completed, and the torsion coil spring 49 is compressed as shown in FIG. It becomes a state. The detachable lever 26 is rotatable around the center line A1 in a state where the tightening of the screw member 27 is completed. The operator presses the base portion 20 against the object and presses the operation button 18 to rotate the electric motor 12. The rotational force of the electric motor 12 is converted into the reciprocating force of the plunger 15 by the reciprocating mechanism 16, and the blade 23 cuts the object.

  As described above, when the operator attaches the detachable lever 26 to the boss portion 25, when the end 51 is brought into contact with the inclined surface 37 and the screw member 27 is tightened, the end 51 is pressed against the inclined surface 37. With the generated component force, the torsion coil spring 49 receives a torsional moment, the end 51 moves along the inclined surface 37, the end 51 is engaged with the outer surface 36 a of the projection 36, and the detachable lever 26 is moved to the boss 25. The work of attaching to is completed. In a state where the detachable lever 26 is attached to the boss 25 and the end 51 is engaged with the outer surface 36a of the projection 36, the detachable lever 26 exerts a clockwise biasing force in FIG. receive.

  That is, in the step of tightening the screw member 27, the step of engaging the end portion 51 of the torsion coil spring 49 with the outer surface 36a of the protrusion 36 while the one end portion of the torsion coil spring 49 is moved in the torsion direction is automatically performed. Therefore, the number of assembling steps for attaching the detachable lever 26 to the boss portion 25 of the operation mechanism accommodating portion 14 can be reduced, and the assembling workability is improved.

  Further, the inner surface of the support groove 43 contacts the end 50 of the torsion coil spring 49 at the center of the detachable lever 26 in the direction along the center line A1. For this reason, it is possible to suppress the detachable lever 26 from being inclined with respect to the center line A1 by the circumferential urging force of the torsion coil spring 49.

  Furthermore, before the operation of connecting the detachable lever 26 to the boss portion 25 is completed, that is, before the tightening of the screw member 27 is completed, the end portion 51 moves along the inclined surface 37 in the direction of the center line A1. When the tightening of the screw member 27 is completed and the operation of connecting the detachable lever 26 to the boss portion 25 is completed, the end portion 51 is pressed against the outer surface 36 a of the protrusion 36.

  In the first embodiment, a design example of the torsion coil spring 49 and the protrusion 36 will be described. When the torsion coil spring 49 receives a compressive load, a repulsive force F1 in the direction of the center line A1 is generated. When the end 51 is pressed against the inclined surface 37 with a repulsive force F1, a torsional moment T1 in the circumferential direction is generated in the torsion coil spring 49 by a component force of the repulsive force F1. The torsion moment T1 has a value corresponding to the acute angle θ1 formed between the end face 28 and the inclined surface 37. Then, the spring constant and the angle θ1 of the torsion coil spring 49 may be designed so that the torsion moment T1 is larger than the repulsive force T2 in the circumferential direction of the torsion coil spring 49.

  The correspondence between the configuration described in Embodiment 1 and the configuration of the present invention is as follows. The screw member 27 also serves as the rotating shaft and the connecting member of the present invention, the operation mechanism accommodating portion 14 corresponds to the first member of the present invention, and the detachable lever 26 corresponds to the second member of the present invention. The jigsaw 10 corresponds to the working machine of the present invention. The torsion coil spring 49 corresponds to the torsion coil spring of the present invention, the end 51 corresponds to the first end of the present invention, and the outer surface 36a of the protrusion 36 corresponds to the first engagement portion of the present invention. The end portion 50 corresponds to the second end portion of the present invention, and the inner surface of the support groove 43 corresponds to the second engaging portion of the present invention.

  Further, the inclined surface 37 corresponds to the guide portion and the inclined surface of the present invention, and the first storage portion 40 corresponds to the storage portion of the present invention. Furthermore, the plunger 15 corresponds to the operating member of the present invention, and the tool support mechanism 22 corresponds to the tool support mechanism of the present invention. Further, the position of the tool support mechanism 22 where the push arm 48 is separated from the projection 24 as shown in FIG. 6A corresponds to the first position of the present invention, and the push arm as shown in FIG. 6B. The position of the tool support mechanism 22 rotated by pressing the protrusion 48 against the protrusion 24 corresponds to the second position of the present invention.

(Embodiment 2)
FIG. 10 shows Embodiment 2 in the case where the working machine of the present invention is a saver saw. The saver saw 70 includes a plunger 71 that reciprocates by the rotational force of the motor, a blade 72 attached to the plunger 71, a knob 73 that allows the blade 72 to be attached to and detached from the plunger 71, and the knob 73 that rotates relative to the plunger 71. A screw member 74 that can be connected, a torsion coil spring 75 that urges the knob 73 circumferentially around the center line A <b> 2 of the screw member 74, and a blade holder 85 that covers the knob 73. The knob 73 is provided with a storage portion 82, and a support groove 76 continuous with the storage portion 82 is provided. The knob 73 prevents the movement of the pin 77 that fixes the blade 72 to the plunger 71. A projection 78 is provided on the plunger 71, and an inclined surface 79 is provided at the tip of the projection 78. The inclined surface 79 is inclined with respect to a plane perpendicular to the center line A2. A knob cover 84 is attached to the knob 73.

  The torsion coil spring 75 is accommodated in the accommodating portion 82 and is wound around the outer periphery of the shaft portion of the screw member 74. The torsion coil spring 75 includes end portions 80 and 81. The end 80 is pressed against the outer surface 78 a of the protrusion 78, and the end 81 is pressed against the inner surface of the support groove 76. The torsion coil spring 75 is made of metal, and generates a repulsive force upon receiving a torsional moment in the circumferential direction around the center line A2. The torsion coil spring 75 also serves as a compression spring that generates a repulsive force in the direction of the center line A2 when receiving a compressive load in the direction of the center line A2.

  The knob 73 is stopped at a fixed position by a torsion coil spring 75 receiving a clockwise urging force, that is, a turning force, about the center line A2. When the knob 73 is stopped at the fixed position, the knob 73 restricts the movement of the pin 77 and the blade 72 is fixed to the plunger 71. On the other hand, when the operator rotates the knob 73 counterclockwise in FIG. 10 and moves the knob 73 to the release position, the movement of the pin 77 is allowed and the blade 72 can be removed from the plunger 71. it can. The blade holder 85 restricts the range in which the knob 73 rotates around the center line A2.

  Next, an operation for attaching the knob 73 to the plunger 71 will be described. This operation can also be grasped as a method or a process. The shaft portion of the screw member 74 is inserted into the coil portion of the torsion coil spring 75 in a state where the torsion coil spring 75 is disposed in the accommodating portion 82 of the knob 73 and the end portion 81 is disposed in the support groove 76. At this time, the end 80 is in contact with the inclined surface 79, and the torsion coil spring 75 does not generate a repulsive force in the circumferential direction.

  When the screw member 74 is tightened, the head 83 of the screw member 74 is pressed against the knob 73, and the torsion coil spring 75 sandwiched between the plunger 71 and the knob 73 receives a compressive load in the direction of the center line A2. When the end portion 80 is pressed against the inclined surface 79, the end portion 80 moves along the inclined surface 79 by the component force, and the end portion 80 comes off the inclined surface 79 and contacts the plunger 71. The torsion coil spring 75 receives a torsional moment and generates a repulsive force in the circumferential direction around the center line A2.

  For this reason, the end portion 80 is pressed against the outer surface 78 a of the protrusion 78, and the end portion 81 is pressed against the inner surface of the support groove 76. That is, the knob 73 receives the urging force clockwise in FIG. 10 about the center line A2 and stops at the fixed position. Therefore, when the power of the motor is transmitted to the blade 72 through the plunger 71 and the object is cut by the blade 72, the knob 73 can be prevented from vibrating with respect to the plunger 71.

  When the screw member 74 is tightened in the process of attaching the knob 73 to the plunger 71, the end 80 of the torsion coil spring 75 is pressed against the inclined surface 79, and the torsional moment is applied to the torsion coil spring 75 by the reaction force. Is pushed away from the inclined surface 79 against the plunger 71, and the end 80 is pushed against the outer surface 78 a of the protrusion 78. Therefore, the repulsive force of the torsion coil spring 75 receives a clockwise urging force in FIG.

  That is, in the process of tightening the screw member 74, the process of engaging the end 80 of the torsion coil spring 75 with the outer surface 78a of the protrusion 78 is automatically performed. Therefore, the number of steps for attaching the knob 73 to the plunger 71 can be reduced, the assembling workability can be improved, and the vibration of the knob 73 can be suppressed when the blade 72 is in the fixed position. In addition, the inclined surface 79 is disposed behind the portion where the end portion 80 and the outer surface 78 a of the protrusion 78 are in contact with each other in the biasing direction of the knob 73.

  The correspondence between the configuration described in the second embodiment and the configuration of the present invention will be described. The screw member 74 corresponds to the rotating shaft, the connecting member, and the screw member of the present invention, and the plunger 71 corresponds to the present invention. The knob 73 corresponds to the first member, the knob 73 corresponds to the second member of the present invention, and the saver saw 70 corresponds to the working machine of the present invention. The torsion coil spring 75 corresponds to the torsion coil spring of the present invention, the end portion 80 corresponds to the first end portion of the present invention, and the outer surface 78a of the projection 78 corresponds to the first engagement portion of the present invention. The end portion 81 corresponds to the second end portion of the present invention, the inner surface of the support groove 76 corresponds to the second engaging portion of the present invention, and the inclined surface 79 corresponds to the guide portion and the inclined surface of the present invention. The accommodating part 82 corresponds to the accommodating part of the present invention.

(Other matters)
The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, the jigsaw 10 according to the first embodiment grasps the detachable lever 26 as the first member, provides a protrusion on the detachable lever 26, grasps the outer surface of the protrusion as the first engaging portion, and moves the operation mechanism accommodating portion. It is also possible to grasp 14 as the second member, provide a support groove in the operation mechanism accommodating portion 14, and grasp the support groove as the second engagement portion.

  That is, in the work machine according to the present invention, the first member is the detachable lever, the first member is the detachable lever, the first member is the operation mechanism accommodating portion, and the second member is the detachable lever. It includes a work machine that is an operation mechanism housing section. In addition, the work machine of the present invention has a first engaging portion on the operating mechanism housing portion and a first on the detachable lever in addition to the working device on which the second engaging portion and the housing portion are provided on the detachable lever. A working machine is provided that includes an engaging portion and the operating mechanism housing portion includes the second engaging portion and the housing portion.

  In the first embodiment, the screw member 27 serves as a rotation shaft and a connecting member. However, in addition to the screw member 27 as a connecting member, a rotation shaft can be provided. In the first embodiment, the protrusion 36 that forms the guide portion and the first engagement portion is provided so as to protrude from the end face 28 of the boss portion 25, but the accommodating portion that accommodates a part of the torsion coil spring 49. The guide part and the 1st engaging part may be provided in the accommodating part.

  Further, the second engagement portion in the present invention is an element for positioning the second end portion of the torsion coil spring in the circumferential direction around the center line, and the second engagement portion includes a protrusion, a claw in addition to the support groove. But you can. Furthermore, in the first embodiment, the torsion coil spring 49 also serves as a compression spring, but it does not have to be a compression spring. In this case, the torsion coil spring 49 receives a compressive load and is elastically deformed within the elastic limit, and is pressed against the end face 28 in the direction of the center line A1 by its rigidity. In the second embodiment, the torsion coil spring 75 also serves as a compression spring, but may not be a compression spring. In this case, the torsion coil spring 75 receives a compressive load and is elastically deformed within the elastic limit, and is pressed against the plunger 71 in the direction of the center line A2 by its rigidity.

  Further, when an electric motor is used as a motor for operating the work tool, the power source of the electric motor may be either a DC power source or an AC power source. The direct current power source includes a battery pack that is detachable from the housing.

  Furthermore, in the present invention, “a first engaging portion to which the first end portion is engaged” includes the meaning of “a first engaging portion to which the first end portion is pressed”, and “the second end portion is engaged. The “second engagement portion to be combined” includes the meaning of “second engagement portion against which the second end portion is pressed”.

  Moreover, when using AC power supply as a power supply of an electric motor, the power cable provided in a housing is connected to AC power supply, and a working machine is used. In addition, as a motor for operating the work tool, any of a pneumatic motor, a hydraulic motor, and an internal combustion engine can be used instead of the electric motor. In the first and second embodiments, the clockwise direction and the counterclockwise direction are reversed when the drawing is viewed from behind.

  In the present invention, when the first member and the second member that are pivotably connected to each other via the pivot shaft are operated to rotate the second member against the repulsive force of the torsion coil spring, They can be rotated with respect to each other via a rotating shaft. On the other hand, when the operation of rotating the second member against the repulsive force of the torsion coil spring is not performed, the first member and the second member are positioned and held by the biasing force of the torsion coil spring. The In the work machine according to the present invention, the first member and the second member are rotated with each other, and the fixed state and the released state of the work tool are switched.

  DESCRIPTION OF SYMBOLS 10 ... Jigsaw, 14 ... Operation | movement mechanism accommodating part, 15 ... Plunger, 22 ... Tool support mechanism, 26 ... Detachable lever, 27, 74 ... Screw member, 36, 78 ... Projection, 36a, 78a ... Outer surface, 37, 79 ... Inclination Surface 40, 1st accommodating part, 43, 76 ... Support groove, 49, 75 ... Torsion coil spring, 50, 51, 80, 81 ... End part, 82 ... Accommodating part, A1, A2 ... Center line.

Claims (10)

A working machine having a first member and a second member that are rotatably connected to each other via a rotating shaft,
A torsion coil spring that extends in the direction of the center line of the rotation shaft and biases the second member in a direction to rotate the second member around the center line;
A first engagement portion provided on the first member or the second member and engaged with a first end of the torsion coil spring;
Of the second member or the first member, a second engagement portion that is provided on a member that is not provided with the first engagement portion and that is engaged with a second end portion of the torsion coil spring;
A connecting member for moving the second member along the center line in a direction approaching the first member, and connecting the second member to the first member;
A guide portion for guiding the first end portion toward the first engagement portion before the first end portion engages with the first engagement portion;
Having a working machine.   The work machine according to claim 1, wherein the guide portion is disposed behind the first engagement portion in a biasing direction that acts on the second member.   The work machine according to claim 2, wherein the guide portion is an inclined surface inclined with respect to a plane perpendicular to the center line.   The work machine according to claim 1, wherein the connecting member is a screw member. The screw member also serves as the rotation shaft,
The work machine according to claim 4, wherein the torsion coil spring is wound around an outer periphery of the screw member. The guide portion is provided on the first member,
The first end portion is guided by the guide portion and moved in a direction along the center line before the second member is connected to the first member.
The work machine according to claim 1, wherein the first end portion engages with the first engagement portion when the second member is coupled to the first member.   The work machine according to claim 1, wherein the second member includes a housing portion that houses the torsion coil spring.   The work machine according to any one of claims 1 to 7, wherein the second engagement portion engages with the second end portion at a center of the second member in the center line direction.   The work machine according to any one of claims 1 to 8, wherein the torsion coil spring also serves as a compression spring that receives a compressive load in the center line direction and generates a repulsive force. In the first member,
An operating member that operates with the power of the motor;
A tool support mechanism that is operatively attached to the operating member and supports a work tool;
Is provided,
The tool support mechanism is
A first position for generating a fixing force for fixing the work tool to the operating member;
A second position for releasing the fixing force;
With
The tool support mechanism is configured such that when the second member is rotated with respect to the first member, the first position and the second position are switched to each other by an operating force of the operating member. The working machine according to any one of 9.

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