JP2013035207A - Chain saw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the operability of a chain saw having a chain cover.SOLUTION: A sprocket 14 is disposed on a housing 10 of the chain saw, a guide bar 15 is mounted freely attachably and detachably, and a saw chain 19 provided with a plurality of blade parts is laid between the sprocket 14 and the guide bar 15. A chain cover 21 is disposed on the housing so as to permit the free opening/closing movement between a development position where the saw chain 19 is covered and a storage position where the saw chain 19 is exposed. The chain cover 21 is wound into a winding rotation body 23 to come to a storage state and, meanwhile, is played out to come to a development state.

Description

  The present invention relates to a chain saw for cutting wood or the like with a saw chain, and more particularly to a chain saw having a chain cover that covers the saw chain.

  A chain saw used for cutting an object such as wood has a loop-shaped saw chain, that is, a chain saw, provided with a blade portion protruding outward. The saw chain is movably spanned on a guide bar whose base end is fixed to the housing, and the saw chain is rotationally driven by a drive source provided in the housing. An engine or an electric motor is used as the drive source. The outer teeth of the saw chain, which is a loop-shaped chain saw, are sharp blades, and when the chain saw is stored or transported, the saw chain is covered with a protective material such as a chain cover.

  As a saw chain protective material, there is a bag-shaped chain cover that is formed of resin or the like and covers the saw chain together with a guide bar, as described in Patent Document 1. In Patent Document 2, each has a groove into which a saw chain enters, a straight bar attached to the upper part of the saw chain, a straight bar attached to the lower part, and a semi-circular part connected to these. A chain guard comprising a semicircular sleeve to be mounted is described. These chain guards are removed from the chain saw when the chain saw is in use. Patent Document 3 describes a protective material including a cover member that is attached to a housing so as to be swingable upward about a shaft and covers an upper portion of the saw chain.

Japanese Utility Model Publication No. 07-33605 Japanese Utility Model Publication No. 61-31709 Japanese Utility Model Publication No. 53-111494

  If the chain cover is detachable from the chain saw as in the protective materials described in Patent Documents 1 and 2, since the chain guard is removed when the chain saw is used, the chain guard may be lost. Furthermore, the chain cover cannot be easily mounted on the chain saw, and the mounting work is troublesome.

  Further, as described in Patent Document 3, if the sheath member or the cover member is swingably attached to the housing upward, the cutting operation using the saw chain on the upper side of the guide bar cannot be performed. There is a problem that the operability of is not good.

  An object of the present invention is to improve the operability of a chain saw having a chain cover.

  The chain saw of the present invention is provided with a sprocket that is rotationally driven by a drive source, a housing to which a guide bar is attached, and a plurality of blades, and is spanned between the sprocket and the guide bar and rotated by the drive source. A saw chain to be driven, a chain cover that is provided in the housing and is openable and closable between a deployment position that covers the saw chain and a storage position that exposes the saw chain, and the chain cover that is provided in the housing and is in the storage position And a cover storage portion for storing the battery.

  The chain saw according to the present invention includes a cover segment having a bottom wall facing the outer surface of the saw chain, and both side walls facing the side surfaces of the saw chain and having a length between both end surfaces that decreases as the distance from the bottom wall side increases. A plurality of bottom wall portions are connected to form the chain cover, and a winding rotary body that winds and stores the chain cover from the base end side is provided in the housing. The chain saw according to the present invention is characterized in that the interval between the both side walls of the cover segment is inclined so as to widen from the bottom wall side toward the tip surface side. In the chain saw according to the present invention, the housing includes an unfolding engaging portion that engages with a hook provided at a distal end portion of the chain cover in a state where the saw chain is covered with the chain cover as the unfolding position. The housing is provided with a storage engaging portion with which the hook is engaged with the chain cover in the storage position with the saw chain exposed.

  The chain saw according to the present invention is characterized in that a spiral coil spring is attached to the winding rotary body, and a spring force in a direction in which the chain cover is wound is biased to the winding rotary body. The chain saw according to the present invention is characterized in that a rotating body cover for covering the winding rotary body is mounted on the housing, and an operating member for manually rotating the winding rotary body is provided on the rotary body cover. The chain saw according to the present invention is characterized in that a partition projection is provided between the sprocket and the take-up rotary body to block movement of foreign matter from the saw chain toward the take-up rotary body. The chain saw according to the present invention is characterized in that a chain catcher that is attached to the housing and receives the saw chain when the saw chain is broken serves as the engaging portion for deployment.

  In the chain saw according to the present invention, the chain cover is provided in the housing so that it can be opened and closed freely between the unfolded position for covering the saw chain and the storage position for exposing the saw chain. Is not removed from the housing. Thus, the chain cover is always carried in the saw chain, the chain cover is prevented from being lost, and the operability of the chain saw is improved. When the chain cover is in the unfolded state, the saw chain is covered, so that the saw chain is not exposed to the outside, the saw chain can be safely protected, and the operability of the chain saw is improved.

  If the saw chain is stored so as to be wound around the winding rotary body, even if the length of the guide bar is changed to change to another saw chain having a different length, the saw chain can be covered without excess or deficiency. When a spring force in the direction of winding the guide bar is applied to the winding rotary body, the guide bar can be easily wound.

It is a front view which shows the chain saw which is one Embodiment of this invention in the state in which the chain cover was extended to the expansion | deployment position and the saw chain was covered. It is a front view which shows the chain saw in the state where the chain cover was closed to the storage position and the saw chain was exposed. It is a front view showing a chain saw in a state where a saw chain is covered with a chain cover and a rotating body cover is mounted. It is a front view showing a chain saw in a state where the saw chain is exposed and a rotating body cover is mounted. It is a front view which shows the chain saw with which the guide bar and saw chain with a short dimension were mounted | worn. It is the sectional view on the AA line in FIG. It is a front view of the chain saw which is other embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The illustrated chain saw has a housing 10 in which an engine is incorporated as a drive source. A rear handle 11a is provided at the rear portion of the housing 10 as a chain saw body, and a front handle 11b is provided at the front upper portion. The wood is used by the chain saw with the handles 11a and 11b held by the operator. The object is cut off. The rear handle 11a is provided with a throttle lever 12, and the engine speed is adjusted by operating the throttle lever 12.

  An output shaft 13 connected to the crankshaft of the engine is rotatably mounted on the housing 10, and a sprocket 14 is provided on the output shaft 13. A guide bar 15 is detachably mounted on the front side of the housing 10 with respect to the sprocket 14. A positioning hole into which the positioning pin 16 is fitted is formed at the rear end portion of the guide bar 15, and a long hole 17 extending in the longitudinal direction is formed. A screw member 18 penetrating the long hole 17 is a housing. 10 is provided. When the guide bar 15 is attached to the housing 10, the positioning pin 16 is fitted into the positioning hole with the screw member 18 passing through the long hole 17. The operator can adjust the position of the positioning pin 16 in the front-rear direction. By adjusting the position of the positioning pin 16, the position of the guide bar 15 that is fitted and connected to the positioning pin 16 in the front-rear direction. It can be moved, and the tension of the saw chain 19 can be adjusted.

  The guide bar 15 is looped with an endless chain saw, that is, a saw chain 19 that is looped, and the saw chain 19 is engaged with the teeth of the sprocket 14. In this way, the saw chain 19 spanned between the sprocket 14 and the guide bar 15 is rotationally driven by the engine. The saw chain 19 is provided with a plurality of blade portions at predetermined intervals, and each blade portion protrudes outward. By rotating the saw chain 19, an object such as wood can be cut by the saw chain 19.

  A plurality of types of guide bars 15 and saw chains 19 having different lengths are selectively mounted on the housing 10 in accordance with the object to be cut. FIG. And the saw chain 19 are shown. When the saw chain 19 is attached to the guide bar 15 and the sprocket 14, the screw member 18 attached to the housing 10 is passed through the long hole 17 formed in the guide bar 15 and the positioning pin 16 is fitted into the positioning hole.

  As shown in FIG. 1, a chain cover 21 is mounted on the housing 10 so as to be openable and closable between a deployment position that covers the saw chain 19 and a storage position that exposes the saw chain 19 to the outside as shown in FIG. The chain saw is stored or transported with the chain cover 21 in the unfolded position, and the chain cover 21 is operated to the stowed position when cutting objects such as wood. .

  The chain cover 21 has a structure in which a plurality of cover segments 22 are connected to form a belt shape as a whole, and is formed of a synthetic resin. A winding rotator 23 is rotatably mounted on the housing 10 on the rear side with respect to the sprocket 14, and a base end portion 21a of a chain cover 21 is attached to the winding rotator 23 as shown in FIG. The take-up rotating body 23 is a cover housing portion that houses the chain cover 21.

  As shown in FIG. 2, each cover segment 22 has a bottom wall 24 that faces the outer surface of the saw chain 19 and two side walls 25 that face the side surfaces of the saw chain 19. Cover segments 22 that are adjacent in the longitudinal direction are connected to each other. Both end surfaces 26 of each side wall 25 are inclined so that the distance between the both end surfaces 26 becomes shorter toward the tip end surface 27 side away from the bottom wall 24 side. That is, both end surfaces 26 are inclined toward the inner side in the longitudinal direction of each cover segment 22. Further, the side walls 25 are inclined so that the distance between them increases from the bottom wall 24 side toward the tip surface 27. That is, the distance between both the side walls 25 increases from the bottom wall 24 side toward the tip surface 27.

  Since the end surface 26 of each cover segment 22 is inclined, when the chain cover 21 is wound around the outer periphery of the winding rotary body 23 serving as a cover storage portion, the chain is wound as shown in FIG. The side walls 25 of the cover segments 22 adjacent in the longitudinal direction of the cover 21 do not overlap each other. Thereby, it can prevent that the thickness of the part of the chain cover 21 wound up by the winding rotary body 23 becomes large. Further, since each cover segment 22 wound in a layered manner on the winding rotary body 23 has a side wall 25 inclined, as shown in FIG. 6, the inner cover segment is the outer cover segment. It will get inside. Thereby, it can prevent that the outer diameter of the part of the chain cover 21 wound up in a multilayer on the outer side of the winding rotary body 23 becomes large.

  A hook 28 is provided at the distal end portion 21b of the chain cover 21, and the hook 28 is engaged with the chain cover 21 in the unfolded state and the saw chain 19 covered with the chain cover 21 as shown in FIG. An unfolding engaging portion 31 is provided at the front end of the housing 10 so as to be positioned below the guide bar 15. Furthermore, when the chain cover 21 is stored and the saw chain 19 is exposed to the outside as shown in FIG. 2, the storage engaging portion 32 with which the hook 28 engages is located above the engaging portion 31 in the housing 10. It is provided in the position.

  As the engaging part 31 for deployment, a chain catcher is used for receiving the saw chain 19 so that the broken saw chain 19 is not scattered toward the operator even if the saw chain 19 is broken. The chain cover 21 can be held in an unfolded state by using a chain catcher provided for safety as the engaging portions 31 and 32 and hooking the hooks 28 on the engaging portions 31 and 32.

  As shown in FIG. 6, the winding rotary member 23 is rotatably attached to a support shaft 33 provided in the housing 10 by a stepped screw 34. A spiral coil spring 35 is mounted between the support shaft 33 and the winding rotary body 23, and the spiral coil spring 35 biases the winding rotary body 23 in the direction of winding the chain cover 21 by the spiral coil spring 35. When the hook 28 is removed from the engaging portion 31 for deployment, the chain cover 21 is automatically wound into the storage state shown in FIG. 2 by the spring force.

  As shown in FIG. 1, a partition projection 36 is provided between the winding rotary body 23 and the sprocket 14 so as to partition between them. The partition projections 36 can prevent foreign matters such as chips from scattering toward the winding rotary body 23 from the saw chain 19 side. Thereby, it is prevented that a foreign material is caught between the chain covers 21 to be wound.

  As shown in FIGS. 3 and 4, a side cover 37 is detachably attached to the housing 10 so as to cover the sprocket 14, the winding rotary body 23, and the like, and the screw member 18 passes through the side cover 37. It is supposed to be. By screwing a nut 38 to the screw member 18, the side cover 37 is fastened to the housing 10 together with the guide bar 15.

  As described above, the chain cover 21 is provided in the housing 10 of the chain saw so as to be freely opened and closed at the unfolded position and the storage position, so that the chain cover 21 is not lost. In addition, since the chain cover 21 is in the storage position when the object is cut, the chain cover 21 does not interfere with the cutting work. After the operation of cutting the object using the chain saw is completed, the chain saw 21 can be stored and transported safely by setting the chain cover 21 in the housed state to the expanded state. When the chain cover 21 is wound around the winding rotary body 23 as in the illustrated chain saw, the retracted state can be easily changed from the housed state by simply pulling the tip of the chain cover 21. When the spring force in the winding direction is applied to the winding rotary body 23, the chain cover 21 can be easily stored from the unfolded state to the stored state. Further, the chain cover 21 can be made difficult to loosen in the deployed state by urging the spring force.

  As shown in FIG. 2, when the hook 28 is engaged with the engaging portion 32 for storage and the chain cover 21 is stored and then deployed as shown in FIG. Since it is above the guide bar 15, the upper horizontal portion of the saw chain 19 is covered, and the lower horizontal portion is covered from the arcuate tip portion.

  In order to perform different cutting operations with the same chain saw, the lengths of the guide bar 15 and the saw chain 19 spanned over the guide bar 15 may be changed. However, if the chain cover 21 is wound, the length of the guide bar 15 Even if is changed, the plurality of types of saw chains 19 can all be covered with the same chain cover 21.

  Assuming that the guide bar 15 and the saw chain 19 shown in FIGS. 1 to 4 are the longest of those mounted on the same kind of chain saw, as shown in FIG. When the chain saw is mounted on the chain saw, the chain cover 21 can be used as it is to cover the saw chain 19a. Therefore, when a plurality of saw chains having different lengths are mounted on the chain saw, the length of the chain cover 21 is set in accordance with the longest sort chain. Thereby, all the saw chains used for one chain saw can be covered and protected by the chain cover 21.

  FIG. 7 is a front view of a chain saw according to another embodiment of the present invention. In this case, an operating member 39 for rotating the winding rotary body 23 is rotatably provided on the side cover 37a. ing. As described above, the chain saw shown in FIG. 7 is configured such that when the chain cover 21 is wound around the winding rotary body 23, the winding rotary body 23 is rotated by the operation member 39.

  The illustrated chain cover 21 is attached to the housing 10 and is not removed when a cutting operation is performed using a chain saw, so that the chain cover 21 is prevented from being lost. In addition, since the entire chain cover 21 including the tip of the saw chain 19 can be covered or protected by unfolding one chain cover 21 that is continuous in a band shape, unfolding operability can be improved.

  In the illustrated chain saw, when the chain cover 21 is unfolded from the winding rotary member 23, the chain cover 21 is first unwound to the upper horizontal portion of the saw chain 19 in FIGS. The chain cover 21 is extended to the horizontal portion on the side. On the other hand, the chain cover 21 may be first extended to the lower horizontal part and then extended to the upper horizontal part via a semicircular part. At that time, when the chain cover 21 is in the unfolded state, the hook 28 at the tip thereof is engaged with the upper engaging portion 32, and when the chain cover 21 is in the retracted state, the hook 28 is engaged with the lower engaging portion 31. Will be engaged. As described above, the position at which the front end portion of the chain cover 21 is engaged includes a mode in which the front end portion of the housing 10 is engaged with the upper side of the guide bar 15 and a mode in which the front end portion is engaged with the lower side.

  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, although the illustrated chain cover 21 is wound around the winding rotary body 23 to be in the stored state, the chain cover 21 may be folded at a plurality of locations to be in the stored state. The chain cover 21 may be formed by pin-connecting a plurality of cover segments 22 with a hinge at a portion of the bottom wall 24 of the cover segment 22. In this case, the chain cover 21 is formed by connecting a plurality of cover segments 22 as a synthetic resin material. However, the chain cover 21 may be formed of a metal material.

DESCRIPTION OF SYMBOLS 10 ... Housing, 11a ... Rear handle, 11b ... Front handle, 12 ... Throttle lever, 13 ... Output shaft, 14 ... Sprocket, 15 ... Guide bar, 15a ... Guide bar, 16 ... Positioning pin, 17 ... Long hole, 18 ... Screw member, 19 ... saw chain, 19a ... saw chain, 21 ... chain cover, 22 ... cover segment, 23 ... winding roll, 24 ... bottom wall, 25 ... side wall, 26 ... end face, 27 ... tip face, 28 ... hook, Numerals 31, 32 ... engaging portion, 33 ... support shaft, 34 ... stepped screw, 35 ... spiral coil spring, 36 ... partition projection, 37 ... side cover, 37a ... side cover, 38 ... nut, 39 ... operating member.

Claims (8)

A housing provided with a sprocket that is rotationally driven by a drive source and to which a guide bar is attached;
A plurality of blades, a saw chain that is spanned between the sprocket and the guide bar and rotated by the drive source;
A chain cover that is provided in the housing and is openable and closable to a deployment position that covers the saw chain and a storage position that exposes the saw chain;
A chain saw having a cover storage portion that is provided in the housing and stores the chain cover in the storage position.   A plurality of cover segments, each having a bottom wall facing the outer surface of the saw chain, and both side walls facing the side surfaces of the saw chain and shortening as the distance between the two end surfaces increases from the bottom wall side, are connected at the bottom wall portion. The chain saw according to claim 1, wherein the chain cover is formed, and a winding rotary body that winds and stores the chain cover from the base end side is provided in the housing.   The chain saw according to claim 2, wherein the interval between the side walls of the cover segment is inclined so as to widen from the bottom wall side toward the tip surface side.   The housing is provided with a deployment engaging portion that engages with a hook provided at the tip of the chain cover with the chain cover in the deployed position and covering the saw chain. The chain saw according to claim 2 or 3, wherein the housing is provided with an engaging portion for accommodating the hook with the saw chain exposed as a position.   The spiral winding spring is attached to the winding rotary body, and the spring force in the direction of winding the chain cover is biased to the winding rotary body. Chain saw.   The rotating body cover that covers the winding rotary body is mounted on the housing, and an operation member that manually rotates the winding rotary body is provided on the rotary body cover. The chain saw according to item 1.   The partition protrusion which interrupts | blocks the movement of the foreign material which goes to the said winding rotary body from the said saw chain side between the said sprocket and a winding rotary body is provided. Chain saw.   The chain saw according to any one of claims 1 to 7, wherein a chain catcher that is attached to the housing and receives the saw chain when the saw chain is broken is used as the engaging portion for deployment.

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