JP6475555B2 - Chainsaw - Google Patents

Description

  The present invention relates to a chain saw, and more particularly to a chain saw that is detachably provided with a guide bar case that covers a guide bar and a saw chain.

  Patent Document 1 discloses a chain saw. This chain saw is provided with a housing incorporating an electric motor, a guide bar that protrudes forward from the front of the housing, and is rotatably stretched around the outer periphery of the guide bar. The electric motor drives the outer periphery of the guide bar. And a rotating saw chain. This chain saw is provided with a detachable guide bar case that covers the guide bar and the saw chain on the front side of the housing. When the chain saw is not used during storage or transportation, a guide bar case is attached to the front side of the housing so that the guide bar and the saw chain are covered with the guide bar case, and the operator contacts the saw chain. I try to prevent it.

JP 2010-208329 A

  In the chain saw of Patent Document 1, a guide bar case that covers the guide bar and the saw chain is attached to the front side of the housing to prevent an operator from contacting the saw chain. However, when the operator grips the grip, the trigger switch that drives the electric motor may be turned on unintentionally, the saw chain rotates inside the guide bar case, and the inside of the guide bar case is cut. There was a risk of damage. An object of the present invention is to prevent a guide bar case covering a guide bar of a chain saw and a saw chain from being damaged.

  In order to solve the above problems, the present invention provides a housing incorporating an electric motor, a guide bar protruding forward from a front portion of the housing, and an electric motor that is rotatably stretched on the outer periphery of the guide bar. A chain saw comprising a saw chain that rotates around the outer periphery of the guide bar by driving and a guide bar case that is mounted so as to detachably cover the guide bar and the saw chain on the front side of the housing. The unit is provided with a detection unit for detecting that the guide bar case is in the mounted state, and the electric motor is not driven based on detection by the detection unit that the guide bar case is in the mounted state. A chain saw is provided.

  In the chain saw configured as described above, a detection unit that detects that the guide bar case is in the mounted state is provided at the front portion of the housing, and the detection unit detects that the guide bar case is in the mounted state. Since the electric motor is not driven, the saw chain does not rotate inside the attached guide bar case, and the guide bar case is not damaged by the saw chain.

  In the chain saw configured as described above, the front portion of the housing has a recess, and the end of the guide bar case on the housing side has a protrusion inserted into the recess in the mounted state, and the detection portion is a protrusion. It is preferable to detect that the guide bar case is in the mounted state when is inserted into the recess. Further, as an embodiment of the chainsaw configured as described above, the detection unit includes a detector that detects that the protrusion is inserted into the recess, and the detector detects that the protrusion is inserted into the recess. The guide bar case may be detected as being attached. Further, the detector employs a switch that is turned on or off when the protrusion is inserted into the recess, and detects that the guide bar case is in the mounted state by detecting that the switch is turned on or off. Alternatively, the detector may employ an optical sensor that detects that the protrusion has been inserted into the recess, and the guide bar case is attached when the optical sensor detects that the protrusion has been inserted into the recess. May be detected.

It is a right view which shows the outline of the chainsaw of this invention. It is the expanded sectional view cut | disconnected in the horizontal direction in the part with a recessed part formed in the front part of a housing. It is the side view (a) made into the expansion | extension state when using a guide bar case, and is a side view when it makes it a contracted state when not using a guide bar case, and rotates a spike cover part to a storage position ( b). It is sectional drawing which shows the outline of the detection part in a housing, and is sectional drawing (a) which shows the state before inserting a protrusion into a recessed part, and sectional drawing (b) which shows a state when a protruding part is inserted in a recessed part It is. It is a block diagram of a control apparatus. It is sectional drawing equivalent to FIG. 4 which shows the outline of other embodiment of the detection part in a housing. FIG. 5 is a cross-sectional view corresponding to FIG. 4 illustrating an outline when an optical sensor is used as a detector of a detection unit in a housing.

  Hereinafter, an embodiment of a chain saw of the present invention will be described with reference to the accompanying drawings. As shown in FIG. 1, the chainsaw 10 includes a housing 11 in which an electric motor 20 is built. A rear handle 12 extending rearward is integrally provided at the rear portion of the housing 11, and a side handle 13 extending in the left-right direction is provided at the upper portion of the housing 11. A trigger switch 14 is provided above the rear handle 12, and the electric motor 20 is driven by pulling the trigger switch 14.

  As shown in FIG. 1, a drive shaft 20a that rotates by driving of the electric motor 20 is provided on the right side surface of the housing 11, and a sprocket 21 is fixed to the drive shaft 20a. When the drive shaft 20 a is rotated by driving the electric motor 20, the sprocket 21 is driven to rotate by driving the electric motor 20. A base end portion of a guide bar 22 is fixed to the front portion of the right side surface of the housing 11, and the guide bar 22 projects forward of the housing 11. A saw chain 23 is stretched between the sprocket 21 and the outer periphery of the guide bar 22, and the saw chain 23 rotates between the sprocket 21 and the outer periphery of the guide bar 22 by the rotational drive of the sprocket 21. A sprocket cover 24 is provided on the right side surface of the housing 11, and the sprocket cover 24 covers the sprocket 21 and the base end portion of the guide bar 22.

  As shown in FIGS. 1 and 2, the front portion of the housing 11 is provided with a spike bumper 25 protruding forward on the left side of the guide bar 22. The spike bumper 25 has a plurality of claw portions protruding forward at the front portion, and the guide bar 22 is prevented from shifting in the left-right direction by piercing these claw portions into a timber such as a log.

  As shown in FIG. 1, a battery pack 26 is detachably attached to the rear portion of the housing 11 as a power source for the electric motor 20. The battery pack 26 supplies power to the electric motor 20 based on the operation of the trigger switch 14 and drives the electric motor 20.

  As shown in FIG. 1, a guide bar case 30 that covers the guide bar 22 and the saw chain 23 is detachably mounted on the front side of the housing. As shown in FIG. 3, the guide bar case 30 is made telescopic by a telescopic mechanism. Each of the guide bar cases 30 includes a cylindrical base portion 31, an intermediate portion 32, and a tip portion 33, and the base portion 31 can accommodate the intermediate portion 32 and the tip portion 33, and is extendable.

  If this guide bar case 30 is demonstrated in detail, the base 31 will have the front-end | tip opening 31a, and the front-end | tip opening 31a is a little smaller diameter than the internal diameter of the base 31. FIG. An intermediate portion 32 having a diameter substantially the same as the tip opening 31a of the base portion 31 is accommodated in the base portion 31 so as to be movable along the axial direction. Further, a locking portion 32 a having a larger diameter than the distal end opening 31 a of the base portion 31 is formed at the base end portion of the intermediate portion 32, and the locking portion 32 a of the intermediate portion 32 is formed on the periphery of the distal end opening 31 a of the base portion 31. It is locked and prevented from coming off from the base 31. The intermediate portion 32 has a tip opening 32 b, and the tip opening 32 b has a diameter slightly smaller than the inner diameter of the intermediate portion 32. Inside the intermediate portion 32, a tip portion 33 having substantially the same diameter as the tip opening 32b of the intermediate portion 32 is accommodated so as to be movable along the axial direction. A locking portion 33a having a diameter larger than that of the distal end opening 32b of the intermediate portion 32 is formed at the proximal end portion of the distal portion 33, and the locking portion 33a of the distal portion 33 is formed on the periphery of the distal end opening 32b of the intermediate portion 32. The intermediate portion 32 is locked and is prevented from coming off. As described above, the guide bar case 30 has an extended state in which the base portion 31, the intermediate portion 32, and the tip portion 33 are continuously arranged in the axial direction, and a contraction in which the intermediate portion 32 and the tip portion 33 are accommodated in the base portion 31. It can be stretched between states.

  As shown in FIG. 2, the base 31 of the guide bar case 30 is provided with a cylindrical spike cover 34 that covers the spike bumper 25. The spike cover portion 34 is supported at the base end of the base portion 31 so as to be able to rotate in the vertical direction around the axis. The spike cover portion 34 is used in the left-right direction aligned with the base 31 (shown in FIGS. 2 and 3A), and the storage position aligned with the base 31, the intermediate portion 32, and the tip 33 along the axial direction. (Shown in FIG. 3 (b)).

  A protrusion 35 protruding rearward (housing 11 side) is provided at the base end portion of the base portion 31 of the guide bar case 30 on the housing 11 side, and the protrusion 35 is provided on the front surface (front portion) of the housing 11. It can be inserted into the recess 11a. The protrusion 35 is inserted into the recess 11 a of the housing 11 to detect that the guide bar case 30 is in a mounted state covering the guide bar 22 and the saw chain 23 on the front side of the housing 11. is there.

  As shown in FIGS. 2 and 4, a recess 11 a made of a through-hole is formed in the front surface (front portion) of the housing 11, and a guide bar case is formed at the front of the housing 11 on the rear side of the recess 11 a. A detection unit 40 for detecting the wearing state of 30 is provided. The detection unit 40 detects that the guide bar case 30 is in the mounted state by detecting that the protrusion 35 of the guide bar case 30 is inserted into the recess 11a at the front part in the housing 11. .

  As shown in FIG. 4, the detection unit 40 includes a micro switch (switch) 41 and a rotation lever 42 at the front portion in the housing 11. The micro switch 41 is a detector that detects that the protrusion 35 is inserted into the recess 11a. As shown in FIG. 4A, the microswitch 41 is pushed by the rotary lever 42 and turned on when the protrusion 35 of the guide bar case 30 is not inserted into the recess 11a of the housing 11. . The rotation lever 42 is for detecting by the microswitch 41 that the protrusion 35 has been inserted into the recess 11a. The rotation lever 42 is supported on the upper side of the microswitch 41 just behind the concave portion 11a in the housing 11 so as to be rotatable around a horizontal axis. Further, as shown in FIG. 4A, the rotation lever 42 is urged by a torsion spring 43 so as to be in a suspended position, and the micro switch 41 is pushed and turned on in the suspended position. . From this state, as shown in FIG. 4B, when the guide bar case 30 is mounted on the front side of the housing 11 and the protrusion 35 of the guide bar case 30 is inserted into the recess 11a, the rotating lever 42 protrudes. The micro switch 41 is pushed backward by the portion 35 and rotated backward against the urging force of the torsion spring 43, and the micro switch 41 is turned off from being pushed by the rotating lever 42. As described above, the micro switch 41 is switched from the on state to the off state, thereby detecting that the projection 35 is inserted into the recess 11a. The detection unit 40 inserts the projection 35 by the micro switch 41 into the recess 11a. By detecting this, it is detected that the guide bar case 30 is in the mounted state.

  As shown in FIG. 5, the chainsaw 10 includes a control device 50 that controls the driving of the electric motor 20. The control device 50 includes the trigger switch 14, the electric motor 20, and the detection unit 40 (particularly, the micro switch 41). And connected to. When an off signal is input from the micro switch 41 to the control device 50, that is, when it is detected that the protrusion 35 of the guide bar case 30 is inserted into the recess 11a, the electric motor 20 is supplied with power from the battery pack 26. Control is performed so that the electric motor 20 is not driven even when the trigger switch 14 is pulled.

  When the chain saw 10 configured as described above is used, the guide bar case 30 is removed from the front side of the housing 11, and the operator holds the rear handle 12 with the right hand and the side handle 13 with the left hand. When the operator pulls the trigger switch 14 with the index finger of the right hand, the sprocket 21 is rotationally driven by the drive of the electric motor 20, and the saw chain 23 is rotated on the outer periphery of the guide bar 22 by the rotational drive of the sprocket 21. In this state, the saw chain 23 rotating around the outer periphery of the guide bar 22 is pressed against a log or the like, so that the log or the like is cut by the rotating saw chain 23.

  When the chain saw 10 is not used for storage or transportation, a guide bar case 30 is mounted on the front side of the housing 11 so as to cover the guide bar 22 and the saw chain 23. At this time, the protrusion 35 provided on the base 31 of the guide bar case 30 is inserted into the recess 11 a provided on the front of the housing 11, and the micro switch 41 of the detection unit 40 is turned on by being pushed by the rotation lever 42. It is turned off. When an off signal is input from the micro switch 41 to the control device 50, that is, when detection information indicating that the guide bar case 30 is attached is input, the control device 50 supplies power from the battery pack 26 to the electric motor 20. Is controlled so that the electric motor 20 is not driven.

  In the chain saw 10 configured as described above, a detection unit 40 that detects the mounting state of the guide bar case 30 is provided at the front portion of the housing 11, and the detection unit 40 detects that the guide bar case 30 is in the mounting state. Therefore, the electric motor 20 is not driven. In this embodiment, the chain saw 10 includes a concave portion 11a formed of a through hole in the front portion of the housing 11, and a protrusion 35 inserted into the concave portion 11a in an attached state at an end portion of the guide bar case 30 on the housing 11 side. The detection unit 40 detects that the guide bar case 30 is in the mounted state when the projection 35 is inserted into the recess 11a. More specifically, the detection unit 40 includes a micro switch 41, and the micro switch 41 detects that the protrusion 35 of the guide bar case 30 is inserted into the recess 11a. It is detected that the device is in a mounted state. The control device 50 controls the power supply from the battery pack 26 to the electric motor 20 to be cut off based on detection of the mounting state of the guide bar case 30 by the detection unit 40.

  As described above, since the electric motor 20 is not driven based on the detection by the detection unit 40 that the guide bar case 30 is in the mounted state, the saw chain 23 is rotated inside the mounted guide bar case 30. Therefore, there is no possibility that the guide bar case 30 is damaged by the rotating saw chain 23.

  In the chain saw 10 of the above-described embodiment, the detection unit 40 includes the micro switch 41 and the rotation lever 42, and the micro switch 41 is turned on by being pressed by the rotation lever 42 when the guide bar case 30 is not attached. When the guide bar case 30 is attached, the guide bar case 30 is not pushed by the rotary lever 42 and is in an off state. As described above, when the micro switch 41 of the detection unit 40 is in the OFF state, it is detected that the guide bar case 30 is in the mounted state. However, the present invention is not limited to this. As shown in FIG. 6, when the protrusion 35 of the guide bar case 30 is inserted into the recess 11 a of the housing 11, the microswitch 41 is moved by the protrusion 35. It may be detected that the guide bar case 30 is in the mounted state when the micro switch 41 is turned on when the micro switch 41 is turned on. The effect of this can be obtained.

  In the chain saw 10 described above, the micro switch 41 of the detection unit 40 is used as a detector that detects that the protrusion 35 is inserted into the recess 11a. However, in other embodiments, FIG. As shown in FIG. 6, instead of the micro switch 41 of the detection unit 40, an optical sensor 41A may be employed as a detector that detects that the protrusion 35 is inserted into the recess 11a. In this case, when the light from the light emitting portion 41Aa of the optical sensor 41A is blocked by the projection 35 inserted into the recess 11a and cannot be received by the light receiving portion 41Ab, the optical sensor 41A has the projection 35 inserted into the recess 11a. Detect that. The detection unit 40 detects that the guide bar case 30 is in the mounted state by detecting that the protrusion 35 is inserted into the recess 11a by the optical sensor 41A. The control device 50 controls the electric motor 20 not to be driven based on the detection information that the guide bar case 30 by the optical sensor 41A of the detection unit 40 is in the mounted state. Thus, even when the optical sensor 41A is employed as the detector, the same effects as described above can be obtained.

  In the chainsaw 10 of the above-described embodiment, the micro switch 41 and the optical sensor 41A of the detection unit 40 are employed as a detector that detects that the protrusion 35 is inserted into the recess 11a. However, the present invention is not limited to this, and various detectors may detect that the protrusion 35 is inserted into the recess 11a. As an example of this, a magnet is provided on the protrusion 35 of the guide bar case 30, or the protrusion 35 is made of a magnet, and a reed switch that is turned on by the magnetic force of the protrusion 35 at the front in the housing 11 is used as a detector. It may be adopted. In this case, when the REIT switch is turned on by the magnetic force of the protrusion 35, it is detected that the protrusion 35 has been inserted into the recess 11a, and the guide bar case 30 is in the mounted state by the detector 40. Detect. The control device 50 controls the electric motor 20 not to be driven based on the detection information that the guide bar case 30 by the reed switch of the detection unit 40 is in the mounted state. As described above, even when another detector such as a reed switch is adopted as the detector, the same effect as described above can be obtained.

  Further, the detection unit 40 of the chain saw 10 is not limited to a detector that detects that the protrusion 35 has been inserted into the recess 11 a, and the battery pack 26 is provided with the protrusion 35 inserted into the recess 11 a of the housing 11. A part of a circuit that supplies electricity to the electric motor 20 from a power source such as the above may be electrically cut off. Even in this case, the above-described effects can be obtained.

  In this embodiment, the battery pack 26 is used as a power source for driving the electric motor 20 of the chainsaw 10. However, the present invention is not limited to this, and the electric motor 20 is electrically connected using a power cord as an external power source. It may be configured to be connected to.

  In this embodiment, the guide bar case 30 can be expanded and contracted by a telescopic mechanism. However, the present invention is not limited to this, and the guide bar case 30 may not be expanded and contracted by using one cylindrical member. Even when such a configuration is adopted, the above-described effects can be obtained.

  DESCRIPTION OF SYMBOLS 10 ... Chain saw, 11 ... Housing, 11a ... Recessed part, 20 ... Electric motor, 22 ... Guide bar, 23 ... Saw chain, 30 ... Guide bar case, 35 ... Projection part, 40 ... Detection part, 41 ... Switch (detector) , 41A ... optical sensor (detector).

Claims (4)

A housing with a built-in electric motor;
A guide bar that protrudes forward from the front of the housing;
A saw chain that is rotatably stretched on the outer periphery of the guide bar and rotates around the outer periphery of the guide bar by driving the electric motor;
A guide bar case mounted to detachably cover the guide bar and the saw chain on the front side of the housing ;
A trigger switch for driving the electric motor;
A chainsaw equipped with
The front part of the housing is provided with a recess,
Provided at the end of the guide bar case on the housing side is a protrusion inserted into the recess,
A detection unit that detects that the guide bar case is in a mounted state at a front portion of the housing, and detects that the guide bar case is in a mounted state when the protrusion is inserted into the recess. Providing the detecting unit ,
Chainsaw wherein when said guide bar case I by the detection portion is detected as being mounted state, wherein even if the trigger switch is operated, wherein said electric motor is not to drive. The chainsaw according to claim 1 ,
The detector includes a detector that detects that the protrusion has been inserted into the recess,
A chain saw characterized by detecting that the guide bar case is in a mounted state by detecting that the protrusion is inserted into the recess by the detector. The chainsaw according to claim 2 ,
The detector employs a switch that is turned on or off when the protrusion is inserted into the recess,
A chain saw characterized by detecting that the guide bar case is in a mounted state by detecting that the switch is turned on or off. The chainsaw according to claim 2 ,
The detector employs an optical sensor that detects that the protrusion has been inserted into the recess,
A chain saw characterized by detecting that the guide bar case is in a mounted state by detecting that the protrusion is inserted into the recess by the optical sensor.

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