JP4949296B2 - Rotary cutter for brush cutter - Google Patents

Description

  The present invention relates to a rotary for a brush cutter for cutting grass and the like by a cord (mainly made of nylon) extending in a radial direction of a case that is driven to rotate by a power of a prime mover or the like through a rotary shaft. It concerns the cutter.

Conventionally, as this type of rotary cutter, a nylon cord is stored in a reel, and when the cord is worn, the cutter is pressed against the ground during rotation, or the cord is pulled out by striking the cord, or the cutter is pulled out. A system is known in which a cord is pulled out by increasing the rotation of the. In this type of rotary cutter, when the cord is worn and the cord stored in the reel is consumed, it is necessary to disassemble the rotary cutter, take out the reel, wind a new cord, and reassemble the components. However, in such a system, it is very troublesome and inconvenient to perform such work during the mowing work, not only in the mowing work, but when disassembling the rotary cutter and taking out the reel, Since the reel related parts and other components are also removed at the same time, there is a risk of losing these components. For this reason, for example, a reel cylinder (cord winding) can be used as a simplified cutter for replacing the cord when it is consumed or as a rotary cutter capable of replacing the cord without assembling and disassembling the rotary cutter. A rotary cutter has been proposed in which a through hole is formed in the turning portion) and a cord is passed through the through hole and wound around a cylindrical portion of a reel (see Patent Documents 1 to 3 and the like).
Utility Model Registration No. 2509199 JP 2005-124501 A JP 2006-514837 A

  However, in the case of the conventional rotary cutters described in Patent Documents 1 to 3, there is an advantage that the code can be replaced without disassembling the rotary cutter and taking out the reel to the outside. In the case of the rotary cutter described in No. 1, between the outer peripheral surface and the inner peripheral surface of the cylinder body portion (cord winding portion) of the reel, it is not provided on the inner peripheral surface so as to be orthogonal to the rotation axis. The cord insertion hole to be drilled must be provided so that the upper and lower positions of the cord insertion opening and the guide hole provided in the case are on the same horizontal plane, and it is easy to manufacture and process the cord insertion hole and the guide hole. However, the manufacturing cost of the rotary cutter is relatively high, and the rotary cutter described in Patent Document 2 has a code that is placed above and below the two-layer reel. It is a structure that winds separately, and since the cord insertion hole for distributing the code up and down is provided in the partition part, the structure of the reel is relatively complicated, and many of its production and processing There is a drawback that it takes labor and time, and the production cost of the rotary cutter is relatively high. Furthermore, in the case of the rotary cutter described in Patent Document 3, a reel is provided with two parts, a cylindrical fixed head provided on the axis of the reel and a spool (cord winding part) externally fitted to the fixed head. And the spool has a structure in which the cord is distributed up and down like the rotary cutter described in Patent Document 2, and the cord is passed through the spool and the fixed head in the partition portion. Since it has a structure with cord insertion holes for sorting up and down, the structure of the reel is more complicated, requiring more time and effort for its production and processing, and the cost of manufacturing a rotary cutter is even higher. There is a drawback. Furthermore, in the case of the conventional rotary cutters described in Patent Documents 1 to 3, there is a common drawback that it takes time and labor to insert and conduct the cord when winding the cord around the reel.

  The present invention eliminates the above-mentioned conventional drawbacks, is easy to manufacture and process, and even when replacing the cord, there is no risk of losing the reel related parts and other components, and the cord can be easily and quickly wound. An object of the present invention is to provide a rotary cutter that can be manufactured at low cost.

  A rotary cutter for a brush cutter according to the present invention is configured by integrally forming a reel and a pressing body, and adopting a concave groove fitting method instead of a conventional insertion hole method for a cord winding mechanism around the reel. The gist is a cord that rotates to cut grass and the like, a reel that accommodates the cord and feeds the cord while intermittently rotating, a case that accommodates the reel, and a cover that covers the case, In a rotary cutter for a bush cutter, which is movable in the axial direction by projecting and pressing from the case and includes a pressing body for intermittently rotating the reel, the reel and the pressing body are integrally configured, and the reel A cord insertion concave groove is provided in the radial direction, and the cord is inserted into the cord insertion concave groove and wound.

Further, this rotary cutter for a brush cutter incorporates at least one elastic body between the reel and the case in the axial direction, the reel and the pressing body are integrally formed via the case, or between the case and the pressing body. Preferably, at least one elastic body is incorporated in the axial direction, or at least one elastic body is incorporated in the axial direction between the reel and the cover and between the case and the pressing body. It is what. The elastic body is generally a spring or rubber.

  Furthermore, in the rotary cutter for a brush cutter according to the present invention, a cord lifting prevention projection is provided on the inner wall of the cord insertion concave groove in order to prevent the cord from floating in the cord insertion concave groove. Alternatively, it is preferable that the opening of the concave groove for inserting the cord is formed in a bowl shape.

  In the rotary cutter for a brush cutter according to the present invention, since the reel and the pressing body are integrally formed, there is no risk of losing the related parts of the reel and other components when replacing the cord, and the cord for the reel The winding mechanism is replaced with the conventional insertion hole method, adopting the concave groove fitting method, and the cord is inserted into the concave groove for inserting the cord formed on the reel, and the structure is wound and wound. The cord can be easily and quickly attached to the reel, the cord can be wound quickly and reliably, and the number of parts is structurally easy to manufacture and process, and the manufacturing cost is low. Furthermore, the cord at the time of winding the cord on the reel can be obtained by providing the cord detachment preventing projection on the inner wall of the cord fitting concave groove or forming the opening of the cord fitting concave groove in a bowl shape. Can be prevented and the cord can be wound stably and reliably.

  1 to 3 show a first embodiment of a rotary cutter for a brush cutter according to the present invention, FIG. 1 is a plan view showing a state in which a cover is removed, and FIG. 2 is a longitudinal section of the rotary cutter for a brush cutter according to the first embodiment. 3 is a front view, FIG. 3 is an AA arrow view of FIG. 2, FIG. 4 is a view corresponding to FIG. 2 showing the second embodiment of the present invention, and FIG. 5 is a view corresponding to FIG. FIG. 6 is a view corresponding to FIG. 2 showing the fourth embodiment of the present invention, FIG. 7 is a view corresponding to FIG. 2 showing the fifth embodiment of the present invention, and FIG. FIG. 9 is a schematic front view of a reel showing an example of the structure of the groove for inserting the cord of the rotary cutter for a brush cutter according to the present invention. FIG. It is a schematic front view of a reel showing an example of the shape of an opening. 1 is a case, 2 is a cover, 3 is a reel, 4 is a pressing body, and 5 is a cord. Interpolating groove, the 6 binding screws, 7 spring, 8 code guide, 9 is a code.

  First, the structure of the rotary cutter for a brush cutter according to the first embodiment of the present invention shown in FIGS. 1 to 3 will be described. The rotary cutter for a brush cutter according to the first embodiment strikes the rotary cutter (pressing body). And the structure is such that the reel 3 with the bottomed cylindrical pressing body 4 integrally provided at the center of the case 1 projects the pressing body 4 below the case 1. A cord guide 8 is provided at the outer peripheral end of the case 1, and a cylindrical portion 2-1 projecting from a central portion of the inner surface of the cover 2 is provided in a circular recess 3-1 provided in the central portion of the reel 3. The cover 2 and the reel 3 are elastically supported by a spring 7 that is detachably fitted and is interposed between the circular recess 3-1 and the cylindrical portion 2-1.

  Further, the reel 3 with the bottomed cylindrical pressing body 4 provided integrally is provided with a cord insertion concave groove 5 on the upper surface side in the diameter direction passing through the center of the reel. The cord guide 8 is disposed on the same straight line as the concave groove 5 for use and is attached to the case 1. The cord guide 8 is provided with a concave groove 8-1 having a width substantially the same as that of the concave groove 5 for inserting the cord at the center.

  The rotary cutter for the brush cutter has a structure in which the case 1 and the reel 3 and the reel 3 and the cover 2 are engaged with each other by an uneven fitting method. When the pressing body 4 is struck against the ground, the pressing body 4 By being pushed inward, the case 1 and the reel 3 are disengaged, the reel 3 is rotated, and the cord 9 wound around the reel 3 is fed out, and the reel 3 pressed inward. Is engaged with the cover 2 and temporarily stops rotating, but returns to its original position by the elastic force of the spring 7, and the case 1 and the reel 3 are engaged again to fix the reel 3. Reference numeral 10 denotes a nut member that is fixed to the central portion of the cover 2 and connects a drive rotary shaft (not shown) such as a prime mover.

  In the rotary cutter for the brush cutter having the configuration shown in FIGS. 1 to 3, when the cord is replaced when the cord is consumed, the bottomed cylindrical pressing body 4 is integrally provided with the reel 3. The cover 2 and the spring 7 that are detachably fitted are removed, and the cord fitting insertion groove 5 formed on the empty reel 3 that is engaged with the case 1 and the cord fitting insertion groove 5 are the same. In the groove 8-1 of the cord guide 8 arranged on a straight line, a portion located at the center of a new cord having a desired length is fitted and mounted from above, and both ends of the cord are respectively attached. In a state where the cord guide 8 is protruded by an appropriate length, a portion of the bottomed cylindrical pressing body 4 provided integrally with the reel 3 is gripped, and the reel 9 is manually rotated to wind the cord 9 around the reel 3. To go.

  When replacing the cord of the rotary cutter for the brush cutter, it is only necessary to remove the cover 2 and the spring 7 as described above, and the other components are not removed, so that the components of the rotary cutter are lost. Since there is almost no such thing, and a new cord is inserted into and attached to a groove for inserting a cord formed on the reel, the cord 3 can be wound while the reel 3 is fixed to the case 1. The cord can be attached to and wound easily with respect to.

  Next, the rotary cutter for a brush cutter according to the second embodiment shown in FIG. 4 is the same as that shown in FIG. 1 except that the reel 3 and the pressing body 4 are separately formed and screwed together with the case 1 interposed therebetween. The structure is substantially the same as that of the rotary cutter shown in FIG. 1. The configuration is such that the through-hole 1-1 formed in the center portion of the case 1 and the concave portion 3-1 formed in the bottom surface portion of the reel 3 are exposed to the outside. The bottomed cylindrical portion 4-1 of the pressing body 4 is slidably and rotatably fitted in the concave portion 3-1, and the center of each of the reel 3 and the pressing body 4 is projected. The reel 3 and the pressing body 4 are integrated with each other by connecting the abutting portions thereof with a connecting screw 6. The reason why the reel 3 and the pressing body 4 are formed separately and integrally formed with screws is to prevent the case 1, the reel 3 and the pressing body 4 from being separated apart when the cord is replaced. It is.

  In the rotary cutter for the brush cutter having the configuration shown in FIG. 4, when the cord is replaced when the cord is consumed, it is detachably fitted to the reel 3 as in the rotary cutter of the first embodiment. The cover 2 and the spring 7 are removed, and the cord fitting insertion groove 5 formed in the empty reel 3 engaged with the case 1 and the cord arranged on the same straight line as the cord fitting insertion groove 5 A portion located at the center of a new long cord having a desired length is fitted into the concave groove 8-1 of the guide 8 from above and attached, and both end portions of the cord are appropriately longer than the cord guide 8 respectively. In a protruding state, the cord 9 is wound around the reel 3 by gripping the portion of the pressing body 4 coupled to the reel 3 with a screw and manually rotating the reel.

  Even when replacing the cord of the rotary cutter for the brush cutter, it is only necessary to remove the cover 2 and the spring 7 as described above. Therefore, there is almost no risk of losing the components of the rotary cutter, and it is formed on the reel. Since the cord 3 can be wound in a state where the reel 3 is fixed to the case 1 after the new cord is inserted into and attached to the recessed groove for inserting the cord, the cord can be attached and wound on the reel. Simple and quick.

  Further, in the rotary cutter for a brush cutter according to the third embodiment shown in FIG. 5, the mounting position of the spring 7 for elastically supporting the pressing body 4 in the axial direction is set between the pressing body 4 and the case 1. Except for the above, the rotary cutter has substantially the same structure as that of the rotary cutter shown in FIG. 4, and the configuration thereof is a recess 3 formed in the bottom portion of the reel 3 in the through hole 1-1 portion formed in the central portion of the case 1. -1 is protruded to the outside, and the bottomed cylindrical portion 4-1 of the pressing body 4 is slidably and rotatably fitted in the concave portion 3-1, and the case 1 The spring 7 is mounted between an annular groove 1-2 projecting from the outer periphery of the through-hole 1-1 formed at the center of the ring and an annular groove 4-2 formed on the inner surface of the pressing body 4. The pressing body 4 is elastically supported in the axial direction, and the contact portions of the central portions of the reel 3 and the pressing body 4 are connected. It is obtained by an integral structure reel 3 and the pressing member 4 attached at a screw 6.

In the rotary cutter for the brush cutter having the configuration shown in FIG. 5, when the cord is replaced when the cord is consumed, the rotary cutter is detachably fitted to the reel 3 as in the rotary cutter of the second embodiment. The cover 2 is removed, and the cord insertion concave groove 5 formed in the empty reel 3 engaged with the case 1 and the cord guide 8 arranged on the same straight line as the cord insertion concave groove 5 are arranged. In the groove 8-1, a portion located at the center of a new long cord having a desired length is fitted and attached, and both ends of the cord are protruded from the cord guide 8 by an appropriate length. In this state, the cord 9 is wound around the reel 3 by gripping the portion of the pressing body 4 screwed to the reel 3 and manually rotating the reel.

  When replacing the cord of the rotary cutter for the brush cutter having the configuration shown in FIG. 5, it is only necessary to remove the cover 2, and since there is no need to remove the spring 7, there is no possibility of losing the components of the rotary cutter. In addition, since the cord 3 can be wound in a state where the reel 3 is fixed to the case 1 after inserting a new cord into the cord insertion concave groove formed on the reel and mounting the same, as described above, The cord can be attached and wound on the reel easily and quickly.

In the rotary cutter for a brush cutter according to the fourth embodiment shown in FIG. 6, the mounting position of the spring 7 for elastically supporting the pressing body 4 in the axial direction is set between the cover 2 and the reel 3, the case 1 and the pressing body 4. except that the two places between is approximately in those without the same structure as the rotary cutter shown in FIG. 5, the arrangement, the inner surface center of the circular recess 3-2 and the cover 2 provided in the center portion of the reel 3 The cover 2 and the reel 3 are elastically supported by a spring 7 interposed between the cylindrical portions 2-1 projecting from the portion, and the through hole 1-1 formed in the central portion of the case 1 The concave portion 3-1 formed on the bottom surface is protruded to the outside, and the bottomed cylindrical portion 4-1 of the pressing body 4 is slidably and rotatably slidable in the axial direction. At the same time, the outer periphery of the through hole 1-1 formed in the center of the case 1 is projected. The spring 7 is mounted between the annular concave groove 1-2 and the annular concave groove 4-2 formed on the inner surface of the pressing body 4 to elastically support the pressing body 4 in the axial direction, and the reel 3 and the pressing body 4, the abutting portions of the respective central portions are coupled by a coupling screw 6, and the reel 3 and the pressing body 4 are integrated.
It should be noted that the mounting positions of the spring 7 for elastically supporting the pressing body 4 in the axial direction are set between the cover 2 and the reel 3 and between the case 1 and the pressing body 4 when the cord is wound. This is to reduce the load of turning 4. That is, in order to stabilize the feeding of the cord, the load of the spring 7 becomes strong, and it becomes heavy to turn the pressing body 4, so that the load at the time of winding the cord is reduced by dividing the spring 7 into upper and lower two springs 7. I did it.

  In the rotary cutter for the brush cutter having the configuration shown in FIG. 6, when the cord is replaced, the cover 2 and the spring 7 that are detachably fitted to the reel 3 are removed, and the case 1 to the hollow groove 3 for inserting the cord, and the concave groove 8-1 of the code guide 8 arranged on the same straight line as the concave groove 5 for inserting the code. A portion of the new cord having a desired length is located at the center portion of the cord, and is inserted from above and attached to the reel 3 with both ends of the cord protruding from the cord guide 8 by an appropriate length. The cord 9 is wound around the reel 3 by grasping the portion of the pressing body 4 coupled in step S4 and manually rotating the reel.

  In the operation of replacing the cord of the brush cutter for the brush cutter having the structure shown in FIG. 6, there is almost no risk of losing the components of the rotary cutter because only the cover 2 and the spring 7 need be removed. Similarly, after inserting a new cord into the cord insertion concave groove formed on the reel and mounting it, the cord 3 can be wound while the reel 3 is fixed to the case 1, and two upper and lower springs can be used. Since the load for rotating the pressing body 4 can be reduced by the action of 7, the cord can be attached and wound on the reel more easily and quickly.

  The rotary cutter for a brush cutter according to the fifth embodiment shown in FIG. 7 is the same as that shown in FIG. 1 except that the mounting position of the spring 7 for elastically supporting the pressing body 4 in the axial direction is between the reel 3 and the case 1. The structure is substantially the same as that of the rotary cutter shown in FIGS. 3 to 3, and the configuration is such that a reel 3, which is integrally provided with a bottomed cylindrical pressing body 4, is provided below the case 1. The pressing body 4 is assembled so as to protrude, and the case 1 and the reel 3 are elastically supported by a spring 7 interposed between the reel 3 and the case 1.

  When the cord is replaced when the cord is consumed, the cover 2 detachably fitted to the reel 3 integrally provided with the bottomed cylindrical pressing body 4 is removed and engaged with the case 1. The cord insertion concave groove 5 formed in the empty reel 3 and the concave groove 8-1 of the cord guide 8 arranged on the same straight line as the cord insertion concave groove 5 have a desired length. A portion of the new long cord located at the center is fitted and mounted from above, and the cord 3 is provided integrally with the reel 3 with both ends protruding from the cord guide 8 by an appropriate length. The bottomed cylindrical pressing body 4 is gripped, and the reel is pulled out against the spring 7 and rotated to wind the cord 9 around the reel 3. When the cord is worn during work, the portion of the pressing body 4 is gripped and pulled out, and the cord 9 is manually unwound.

  When replacing the cord of the rotary cutter for the brush cutter, it is only necessary to remove the cover 2 as described above, and no other components are removed, so there is no possibility of losing the components of the rotary cutter. In addition, since the cord 3 can be wound in a state where the reel 3 is fixed to the case 1 after the new cord is inserted into the cord insertion concave groove formed on the reel and attached, the cord can be wound on the reel. Mounting and winding operations can be performed easily and quickly.

  Further, in the rotary cutter for a brush cutter according to the sixth embodiment shown in FIG. 8, except that the mounting position of the spring 7 for elastically supporting the pressing body 4 in the axial direction is between the reel 3 and the case 1. 4 has substantially the same structure as the rotary cutter shown in FIG. 4, and the configuration is such that the through hole 1-1 formed in the center portion of the case 1 is provided with the concave portion 3-1 formed in the bottom surface portion of the reel 3. In a state in which the bottomed cylindrical portion 4-1 of the pressing body 4 is slidably and rotatably fitted in the concave portion 3-1, the concave portion 3-1 is slidably and rotatably fitted in the concave portion 3-1. 4, the abutting portions of the respective central portions are coupled by a coupling screw 6 so that the reel 3 and the pressing body 4 are integrated, and a spring 7 is mounted between the case 1 and the reel 3 so as to be integrated with the reel 3. The pressing body 4 having the structure is elastically supported.

  In the rotary cutter for the brush cutter having the configuration shown in FIG. 8, when the cord is replaced when the cord is consumed, it is detachably fitted to the reel 3 as in the rotary cutter of the first embodiment. Of the cord guide 8 disposed on the same straight line as the cord fitting insertion groove 5 formed in the empty reel 3 engaged with the case 1. A portion located at the center of a new long cord having a desired length is fitted into the groove 8-1 from above, and both ends of the cord are protruded from the cord guide 8 by an appropriate length. In this state, the portion of the pressing body 4 coupled to the reel 3 with a screw is gripped, and the reel 9 is manually rotated to wind the cord 9 around the reel 3.

  When replacing the cord of the rotary cutter for the brush cutter, it is only necessary to remove the cover 2 as described above, and the case 1, the reel 3, the pressing body 4, and the spring 7 are not separated apart. , There is no risk of losing the components of the rotary cutter, and after inserting a new cord into the cord fitting concave groove 5 formed on the reel 3 and mounting the cord, Thus, the cord can be attached to the reel and the winding operation can be performed easily and quickly.

  Moreover, as the groove | channel 5 for inserting a cord in the rotary cutter for a brush cutter shown in FIGS. 1 to 8, for example, as shown in FIG. 9, the cord floats on the inner wall of the groove 5 for inserting the cord. As shown in FIG. 10, the winding operation of the cord is made more stable by providing the protrusion 5-1 for prevention or by forming the opening portion of the concave groove 5 for inserting the cord as a hook-shaped 5-2. It can be done quickly and reliably.

  The cord guide 8 in the rotary cutter for a brush cutter shown in FIGS. 1 to 8 is provided with a groove 8-1 having a groove 8-1, which is substantially the same width as the cord fitting groove 5 formed in the reel 3. However, the present invention is not limited to this, and it goes without saying that a cylindrical shape may be used.

  In the rotary cutter for a brush cutter according to the present invention, since the reel and the pressing body are integrally configured, there is almost no risk of losing the reel related parts and other components when replacing the cord. Since the cord winding mechanism is replaced with the conventional insertion hole method, the groove fitting method is adopted, and the cord is inserted into the cord insertion concave groove formed on the reel, and the structure is wound and wound. The cord can be easily and quickly attached to the reel, the cord can be wound quickly and reliably, and the number of components can be reduced and the manufacturing can be easily performed and the manufacturing cost can be reduced. Furthermore, the cord at the time of winding the cord on the reel can be obtained by providing the cord detachment preventing projection on the inner wall of the cord fitting concave groove or forming the opening of the cord fitting concave groove in a bowl shape. Can be prevented and the cord can be wound stably and reliably. Therefore, the rotary cutter for a brush cutter according to the present invention is extremely practical for use in a lawn or weed brush cutter.

It is a top view of the state which removed the cover which shows 1st Example of the rotary cutter for brush cutters which concerns on this invention. It is a vertical front view of the rotary cutter for brush cutters same as the above. FIG. 3 is an AA arrow view of FIG. 2. FIG. 2 is also a view corresponding to FIG. 2 showing a second embodiment of the present invention. FIG. 3 is a view corresponding to FIG. 2 showing a third embodiment of the present invention. FIG. 8 is a view corresponding to FIG. 2 and showing a fourth embodiment of the present invention. FIG. 6 is a view corresponding to FIG. 2 and showing a fifth embodiment of the present invention. FIG. 9 is a view corresponding to FIG. 2 showing a sixth embodiment of the present invention. It is a schematic front view of the reel which similarly shows an example of the structure of the recessed groove part for code | cord insertion of the rotary cutter for brush cutters which concerns on this invention. It is a schematic front view of the reel which similarly shows the example of a shape of the opening part of the groove part for code | cord insertion.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Case 2 Cover 3 Reel 4 Pressing body 5 Cord insertion groove 6 Coupling screw 7 Spring 8 Cord guide 9 Cord 10 Nut member

Claims (8)

  A cord that rotates to cut grass and the like; a reel that houses the cord and feeds the cord while intermittently turning; a case body that houses the reel; a cover that covers the case body; In a rotary cutter for a brush cutter, which is movable in the axial direction by projecting and pressing and includes a pressing body for intermittently rotating the reel, the reel and the pressing body are integrally configured, and a cord is fitted to the reel. A rotary cutter for a brush cutter, characterized in that a groove for insertion is provided in a radial direction, and the cord is inserted into the groove for insertion of the cord and wound.   The rotary cutter for a brush cutter according to claim 1, wherein at least one elastic body is incorporated in the axial direction between the reel and the case.   The rotary cutter for a brush cutter according to claim 1 or 2, wherein the reel and the pressing body are integrated with each other through the case.   The rotary cutter for a brush cutter according to claim 1 or 3, wherein at least one elastic body is incorporated in the axial direction between the case and the pressing body. The rotary for a brush cutter according to claim 1 or 3, wherein at least one elastic body is incorporated in the axial direction between the reel and the cover and between the case and the pressing body. Cutter.   The rotary cutter for a brush cutter according to any one of claims 2 to 5, wherein a spring or rubber is used as the elastic body.   The rotary cutter for a brush cutter according to any one of claims 1 to 6, wherein the cord lifting prevention projection is provided on an inner wall of the cord insertion concave groove.   The rotary cutter for a brush cutter according to any one of claims 1 to 6, wherein the opening of the groove for inserting the cord is formed in a bowl shape.