JP6466670B2 - Cord winding mechanism of the brush cutter head for cord type brush cutter - Google Patents

Description

  The present invention relates to a cord winding mechanism for a cord-type brush cutter for a cord-type brush cutter in which both ends of a cord wound around a cord holder and housed in a case are protruded from the case and both ends of the cord are rotated at high speed to cut grass About.

  Conventionally, a cord winding mechanism for a cord type brush cutter for a cord type brush cutter that cuts grass by rotating both ends of the cord at a high speed by projecting both ends of the cord wound around the cord holder and housed in the case The thing of patent document 1 is known as. The cord winding mechanism of the cord type brush cutter has a pressing portion (14) and a partition portion (12c) which are urged and projected by a spring (15) below the case (exterior case 5). An engagement mechanism (22) for integrally forming a cord holder (reel member 12) divided into two layers of cord winding portions (13a, 13b) and transmitting or releasing the rotation of the case (exterior case 5) And a stepping mechanism (25) for rotating the cord holder (reel member 12) in the loosening direction of the cord (6) when the pressing portion (14) is raised, and a cord insertion hole on the outer periphery of the case (exterior case 5) (11) are provided facing each other, and the code guide holes (18a, 18b) having the distribution guide means (17) adjacent to the code insertion hole (11) are provided in the middle partition part (12c) in the diameter of the pressing part (14). Provide a straight line in the direction (I) That.

  According to the cord winding mechanism of this cord type brush cutter brush cutter head, the cord insertion hole (11) and the cord guide holes (18a, 18b) are aligned with each other, and the cord (6) is connected to the cord insertion hole (11). After inserting the cord guide holes (18a, 18b), the cord holder (reel member 12) is rotated counterclockwise with respect to the pressing portion (14), so that the cord (6 ) Can be wound around the cord holder (reel member 12).

JP 2005-124501 A

  However, in the cord winding mechanism of the above-described conventional cord type brush cutter, the cord wound around the cord holder (reel member 12) is entangled, and the cord is not normally drawn out during the work. Arise. FIG. 9 shows a state where the cords are intertwined during winding of the cords. However, in FIG. 9, instead of rotating the cord holder counterclockwise with respect to the case 90, the case 90 is rotated clockwise with respect to the cord holder. First, as shown in FIG. 9 (1), two cord insertion holes 91 provided facing the outer periphery of the case 90, and two cord through holes 96 provided facing the outer periphery of the cord holder 95 Insert the code C through Then, as shown in FIGS. 9 (2), (3), and (4), the case 90 is rotated in the clockwise direction indicated by the arrow.

  FIG. 9 (2) is a diagram in which the case 90 is rotated by 90 degrees, and FIG. 9 (3) is a diagram in which the case 90 is rotated by 180 degrees. FIG. 9 (4) is a diagram obtained by rotating the case 90 by 270 degrees. As shown in FIGS. 9 (2), (3), and (4), the cord C at the start of winding swells greatly due to the elasticity of the cord C itself, so that it is not wound around the cord holder 95, Wound away. Then, the cord C to be wound after this is wound inside the cord C at the beginning of winding. Thus, since the cord C is irregularly wound around the cord holder 95, the cord C is entangled, and a situation occurs in which the cord C is not normally drawn out during the work. In order to prevent this, every time the cord C is slightly wound around the cord holder 95, the cord C must be pulled toward the outside of the case 90 so that the cord C comes into contact with the cord holder 95. However, it is not always easy to perform such work reliably, but it is troublesome.

  The present invention has been made in view of such conventional problems, and a cord winding mechanism of a cord type brush cutter for a cord type brush cutter that can be easily and reliably wound around a cord holder without tangling the cords. It is to provide.

In order to solve the above problem, the cord winding mechanism of the cord type brush cutter for a cord type brush cutter according to claim 1 is characterized in that both ends of the cord wound around the cord holder and housed in the case are connected to the case. Two cord insertion holes provided opposite to the outer periphery of the case in a cord-type brush cutter brush cutter for cutting grass by rotating both ends of the cord at high speed around the axis of the cord holder The cord can be wound around the cord holder by inserting the cord through and rotating the case and the cord holder relative to each other, and the cord is held on the outer periphery of the case so that tension can be applied. Two cord holding portions are provided, and when the cord is wound around the cord holder and mowing the grass while applying tension to the cord by the cord holding portion , the tip of the cord is held by the cord holding portion. From the department It is to protrude from the cord insertion hole together to.

The cord winding mechanism of the cord type brush cutter for a cord type brush cutter according to claim 2 is characterized in that the cord insertion hole is on a straight line connecting the two cord holding portions, or the cord is wound from the cord holding portion. The angle formed between the cord insertion hole and the cord holding portion with respect to the axial center is 0 to 120 degrees.

  The cord winding mechanism of the cord type brush cutter head according to claim 3 is characterized in that the cord holding portion is capable of inserting the cord and has a hole or groove having an opening in a substantially radial direction of the case. It is to be.

  According to a fourth aspect of the present invention, there is provided a cord winding mechanism for a cord type brush cutter, wherein the cord holding portion is a clamping member that clamps the cord.

In the cord winding mechanism of the cord type brush cutter head according to claim 1, when the cord is inserted into the cord insertion hole and the cord is held by the cord holding portion, the case and the cord holder are relatively rotated. The cord can be wound around the cord holder while tension is applied to the cord by the two cord holding portions. At this time, since the tension is applied to the cord, the cord is regularly wound so as to contact the cord holder. For this reason, the cord is not entangled by the cord holder , and when cutting the grass, the tip of the cord can be removed from the cord holding portion and protruded from the cord insertion hole, so that the cord can be You can pay out. Therefore, according to the cord winding mechanism of the cord type brush cutter head, the cord can be easily and surely wound around the cord holder without being entangled with the cord.

In the cord winding mechanism for the cord type brush cutter head according to claim 2, the cord insertion hole is on a straight line connecting the two cord holding portions or in a direction opposite to the winding direction of the cord from the cord holding portion. Therefore, it is possible to reliably apply tension to the cord when starting to wind the cord. Further, if the angle formed by the cord insertion hole and the cord holding portion with respect to the axial center is smaller than 0 degrees, the cord cannot be tensioned when starting to wind the cord. Furthermore, if the angle formed by the cord insertion hole and the cord holding portion with respect to the axis is greater than 120 degrees, the cord comes into contact with the cord holder, and it becomes difficult to wind the cord around the cord holder. In the present invention, the angle formed by the cord insertion hole and the cord holding portion with respect to the axial center is 0 degree to 120 degrees, so that the cord can be reliably wound around the cord holder.

  In the cord winding mechanism of the cord type brush cutter head according to claim 3, the cord holding portion is a hole or a groove having an opening in a substantially radial direction of the case, so that the cord can be inserted into the cord. It can be wound around the cord holder while applying tension.

  In the cord winding mechanism of the cord type brush cutter for a cord type brush cutter according to claim 4, the cord holding portion is a clamping member that clamps the cord, which can be wound around the cord holder while applying tension to the cord. .

The attachment figure to the brush cutter of the brush head for cord type brush cutters provided with the cord winding mechanism of an embodiment. The disassembled perspective view of the brush head for cord type brush cutters provided with the cord winding mechanism of an embodiment. The front view and sectional drawing of the brush cutting head which are related to the cord winding mechanism of the brush head for the cord type brush cutter of the embodiment and the cord holding part is a hole. The figure which concerns on the cord winding mechanism of the brush head for cord type brush cutters of embodiment, and shows winding of a cord. The front view of the case which concerns on the cord winding mechanism of the bush cutter head for cord type brush cutters of an embodiment, and a cord holding part is a slot. The front view and top view of a case which are related with the cord winding mechanism of the brush head for the cord type brush cutter according to the embodiment and the cord holding portion is a hole. The front view and top view of a case which are related to the cord winding mechanism of the brush head for the cord type brush cutter according to the embodiment and in which the cord holding portion is a clamping member. The front view and top view of a case which are related to the cord winding mechanism of the brush head for the cord type brush cutter according to the embodiment and in which the cord holding portion is a clamping member. The figure which concerns on the cord winding mechanism of the conventional brush cutter for cord type brush cutters and shows winding of a cord.

  An embodiment in which a cord winding mechanism of a cord type brush cutter head according to the present invention is embodied will be described below with reference to the drawings. FIG. 1 is a view showing attachment of a cord type brush cutter brush cutter head 1 having this cord winding mechanism to an operation rod 80 of a brush cutter. As shown in FIG. 1, the cord type brush cutter brush head 1 having this cord winding mechanism is attached to a mounting portion 81 at the tip of the operation rod 80 of the brush cutter by a bolt 82. A cord C protrudes from the cord-type brush cutter brush cutter head 1, and the cord C can be rotated at high speed to cut grass.

  FIG. 2 is an exploded perspective view of a cord type brush cutter brush cutter head 1 including the cord winding mechanism of the embodiment. As shown in FIG. 2, a cord type brush cutter brush head 1 including the cord winding mechanism includes an upper lid 2, a stopper 3, a case 10, and a cord holder 4. The upper lid 2 includes a hollow disc-shaped lid body 2a and a cylindrical cylindrical portion 2b protruding from the center of the lid body 2a. A female screw 2c is formed on the inner periphery of the cylindrical portion 2b, and the female screw 2c is screwed with a male screw 5a formed on the outer peripheral portion of the cylindrical portion 5 of the cord holder 4 described later. Then, the upper cover 2 and the cord holder 4 are fixed together by screwing the female screw 2c and the male screw 5a so that the upper cover 2 and the cord holder 4 can rotate about the axis L as a unit. In addition, two struts 2d project from the symmetrical positions on the concentric circles.

  The stopper 3 has a plate shape that is slightly bent in a bowl shape, and a rotation hole 3c is formed at a position near the front end portion 3a at the center of the front end portion 3a and the rear end portion 3b. The support column 2d of the upper lid 2 is inserted into the rotation hole 3c, and the stopper 3 can be rotated around the support column 2d. Further, a locking claw 3d is formed at the distal end portion 3a. Furthermore, the weight from the rotation hole 3c to the rear end 3b is heavier than the weight from the rotation hole 3c to the front end 3a. Note that the tip 3 a of the stopper 3 may be pressed radially outward of the upper lid 2 by a spring (not shown).

  The case 10 has a cylindrical shape having recesses 11 and 12 on both sides, and an insertion hole 10a is formed in the center. A stopper 3 is accommodated in the recess 11, a guide surface 11 a for guiding the tip 3 a of the stopper 3 is formed on the outer peripheral surface, and locking claws 3 d of the stopper 3 are locked at eight locations on the guide surface 11 a. A locking surface 11b is formed. In addition, two sets of cord insertion holes 13 are provided at symmetrical positions on the outer peripheral portion on the concave portion 12 side. Further, two holes 20 serving as a cord holding portion that holds the cord C while applying tension are provided at two symmetrical positions on the outer peripheral surface of the case 10 so as to have an opening in a substantially radial direction of the case 10. .

  The cord holder 4 has a cylindrical portion 5, a bottom plate 6, and a flange 7. The cylindrical portion 5 has a cylindrical shape and is erected at the center of a hollow disk-shaped bottom plate 6. A disc-shaped flange 7 is provided at the center of the cylindrical portion 5, and a cord winding portion 8 is formed between the bottom plate 6 and the flange 7. A cord C is wound around and stored in the cord winding portion 8. Two through-holes 9 (see FIG. 3 (2)) are opened at symmetrical positions of the cylindrical portion 5 located in the winding portion 8. Further, a male screw 5 a is formed on the outer peripheral portion on the distal end side of the cord winding portion 8 of the cylindrical portion 5. Further, a central hole 5b is formed by the inner peripheral surface of the cylindrical portion 5, and when the cord C is wound, the cord C can be inserted into the cord winding portion 8 from the central hole 5b through the through hole 9. It has become.

  The assembling method of the cord type brush cutter brush cutter head 1 will be described below. First, after attaching the stopper 3 to the upper lid 2, the cylindrical portion 2 b of the upper lid 2 is inserted into the insertion hole 10 a of the case 10, and the upper lid 2 is attached to the case 10. Then, the male screw 5a of the cord holder 4 and the female screw 2c of the upper lid 2 are screwed together so that the upper lid 2 and the cord holder 4 are fixed, and the cord type brush cutter brush cutter head 1 is assembled.

  Next, the operation of the cord type brush cutter brush head 1 will be outlined. However, it is assumed that the cord C is wound around the cord holder 4 and stored in the case 10, and both ends of the cord C are projected from the cord insertion hole 13 of the case 10. When the drive source of the cord type brush cutter is driven, since the locking claw 3d of the stopper 3 is locked by the locking surface 11b of the case 10, the upper lid 2, the cord holder 4, and the case 10 are integrated. And rotate around the axis L. As a result, the cord C can rotate at high speed to mow the grass.

  When the cord C is shortened, the tension applied to the cord C is reduced, the rotational speed of the cord-type brush cutter brush cutter head 1 is increased, and the centrifugal force applied to the rear end portion 3b of the stopper 3 is increased. The engagement with the stop surface 11b is released. Thereby, the code C is fed out.

  Next, a detailed configuration of the cord winding mechanism and winding of the cord C around the cord holder 4 will be described in detail with reference to FIGS. 3 and 4. Fig. 3 (1) is a front view of the cord type brush cutter brush head 1, and Fig. 3 (2) is a sectional view taken along the line III-III in Fig. 1 (1). However, FIG. 3A is a diagram in which the positional relationship between the case 10 and the cord holder 4 in FIG.

  3 (1) and 3 (2), the cord winding portion 8 is an outer peripheral portion of the cylindrical portion 5 and is formed between the bottom plate 6 and the flange 7, and the cord C is wound around the cord winding portion 8. Rotated and stored. The two holes 20 are provided through the symmetric position of the outer peripheral surface of the case 10 so as to have openings in the substantially radial direction of the case 10, and the openings have a quadrangular shape. When the cord C is wound, a frictional force is generated between the hole 20 and the cord C, so that the cord C can be held while applying tension. Note that the shape of the opening is not limited to a quadrangle, and may be a circle, for example. Further, the two through holes 9 opened at the symmetrical position of the cylindrical portion 5 serve to stably wind the cord C around the cylindrical portion 5 at the start of winding of the cord C. Furthermore, the angle θ formed by the cord insertion hole 13 and the hole 20 with respect to the axis L is 120 degrees.

  As shown in FIG. 3 (2), the cord C is wound around the cord holder 4 by the cord winding mechanism. First, the cord insertion hole 13 of the case 10 and the through hole 9 of the cord holder 4 are aligned. The cord holder 4 and the case 10 are relatively rotated so as to be arranged. Then, one end of the cord C is inserted into the central hole 5b of the cord holder 4 from the direction indicated by the arrow A in FIG. 3 (1), and the through hole 9, the cord insertion hole 13, and the hole 20 are sequentially passed through the case 10. Pull out. Similarly, the other end of the cord C is arranged so that the central portion of the cord C is disposed in the central hole 5b. Thus, as shown in FIG. 3B, the attachment of the code C to the code holder 4 is completed.

  When the cord holder 4 is fixed and the case 10 is rotated in the clockwise direction indicated by the arrow in FIG. 3B, the cord C is wound around the cord holder 4 as shown in FIG. 4A is a diagram in which the case 10 is rotated by 90 degrees, and FIG. 4B is a diagram in which the case 10 is rotated by 180 degrees. FIG. 4C is a diagram in which the case 10 is rotated by 270 degrees. As shown in FIGS. 4 (1) to 4 (3), since the tension is applied to the cord C through the hole 20, the cord C is regularly wound so as to contact the cord winding portion 8 of the cord holder 4. Taken.

  Further, instead of the hole 20 in FIG. 3, a case 10 provided with a groove 21 as a cord holding portion as shown in FIG. 5 may be used. Two grooves 21 are provided in a symmetrical position on the outer peripheral surface of the case 10 so as to have an opening in a substantially radial direction of the case 10. The groove 21 can also be held while applying tension to the cord C. The angle formed by the cord insertion hole 13 and the groove 21 with respect to the axis L is 120 degrees.

Furthermore, instead of the hole 20 in FIG. 3, a case 10 provided with a hole 22 as a cord holding portion as shown in FIG. 6 may be used. Two holes 22 are provided at the symmetrical position on the outer peripheral surface of the case 10 so as to have an opening parallel to the axis L. Further, the angle formed by the cord insertion hole 13 and the hole 22 with respect to the axis L is 0 degree. However, since the hole 22 has an opening parallel to the axis L, the cord C is bent. Apply tension. Therefore, it is possible to hold the cord C while applying tension to the hole 22.

  Further, instead of the hole 20 of FIG. 3, a case 10 provided with a clamping member 23 as a cord holding portion as shown in FIG. 7 may be used. Two sandwiching members 23 are provided at symmetrical positions on the outer peripheral surface of the case 10. The clamping member 23 is composed of two plates. When the cord C is inserted between the two plates, the clamping member 23 moves in a direction away from each other, and is biased in a direction close to each other with the cord C interposed therebetween. ing. As a result, the cord C is held by the clamping member 23. Further, the angle formed by the cord insertion hole 13 and the pinching member 23 with respect to the axis L is 0 degree. However, when the cord C is sandwiched between the two plates of the pinching member 23, tension is applied to the cord C. Is done. Therefore, the holding member 23 can also be held while applying tension to the cord C.

  Further, instead of the hole 20 of FIG. 3, a case 10 provided with a clamping member 24 as a cord holding portion as shown in FIG. 8 may be used. Two clamping members 24 are provided at symmetrical positions on the outer peripheral surface of the case 10. The clamping member 24 is a spring. When the cord C is inserted between the clamping member 24 and the case 10, the cord C is sandwiched between the clamping member 24 and the case 10 by the elastic force of the clamping member 24. It is like that. As a result, the cord C is held by the clamping member 24. In addition, the angle formed by the cord insertion hole 13 and the clamping member 24 with respect to the axis L is 0 degree. However, when the cord C is sandwiched between the clamping member 24 and the case 10, tension is applied to the cord C. Is granted. Therefore, the holding member 24 can also be held while applying tension to the cord C.

  In the cord winding mechanism of the cord type brush cutter head according to the embodiment, the cord C is inserted into the cord insertion hole 13 so that the cord C is held by the cord holding portions 20, 21, 22, 23, 24. Thereafter, when the case 10 and the cord holder 4 are relatively rotated, the cord C can be wound around the cord holder 4 while tension is applied to the cord C by the cord holding portions 20, 21, 22, 23, and 24. At this time, since the tension is applied to the cord C, the cord C is regularly wound so as to contact the cord holder 4. For this reason, the cord C is not entangled with the cord holder 4, and the cord C can be fed out normally during the work. Therefore, according to the cord winding mechanism of the cord type brush cutter brush cutter head, the cord C can be easily and reliably wound around the cord holder 4 without being entangled.

  Further, in the cord winding mechanism of the cord type brush cutter brush cutter head, the cord insertion hole 13 is provided in the direction opposite to the winding direction of the cord C from the cord holding portions 20, 21, 22, 23, 24. Therefore, it is possible to reliably apply tension to the cord C when starting to wind the cord C. If the angle formed by the cord insertion hole 13 and the cord holding portions 20, 21, 22, 23, 24 with respect to the axis L is smaller than 0 degrees, the cord C is tensioned when the cord C starts to be wound. Can't give. Furthermore, if the angle formed by the cord insertion hole 13 and the cord holding portions 20, 21, 22, 23, 24 with respect to the axis L is greater than 120 degrees, the cord C comes into contact with the cord holder 4, and the cord It becomes difficult to wind C around the cord holder 4. In the present invention, since the angle formed by the cord insertion hole 13 and the cord holding portions 20, 21, 22, 23, 24 with respect to the axis L is 0 degree to 120 degrees, the cord C is securely attached to the cord holder 4. Can be wound up.

  Further, in the cord winding mechanism of the cord type brush cutter brush cutter head, the cord holders 20, 21, and 22 are capable of inserting the cord C, and the holes 20 and 22 having openings in the substantially radial direction of the case 10. Or since the groove | channel 21 is employ | adopted and the clamping members 23 and 24 which clamp the code | cord | chord C are employ | adopted, the code | cord | chord C can be wound around the cord holder 4, providing tension | tensile_strength.

  As mentioned above, although the cord winding mechanism of the brush head for the cord type brush cutter of the present invention has been described according to the embodiment, the present invention is not limited to these and does not contradict the technical idea of the present invention. Needless to say, the present invention can be applied with appropriate changes. For example, in this embodiment, as a cord type brush cutter brush cutter equipped with the cord winding mechanism of the present invention, when the cord is shortened, the cord is fed out as the brush head rotates faster. However, the present invention is not limited to this, and, for example, it is possible to employ a cord that is fed out by hitting a hitting portion of a brush head against the ground.

  DESCRIPTION OF SYMBOLS 1 ... Crusher head for cord type brush cutter, 2 ... Top cover, 3 ... Stopper, 4 ... Cord holder, 10 ... Case, 13 ... Cord insertion hole, 20, 21, 22, 23, 24 ... Cord holding part (20, 22 ... hole, 21 ... groove, 23, 24 ... clamping member), C ... cord, L ... axis.

Claims (4)

A cord type brush cutter for cutting a cord that is wound around a cord holder and projects both ends of the cord stored in the case from the case, and rotates the both ends of the cord at high speed around the axis of the cord holder. In the head
The cord can be wound around the cord holder by inserting the cord through two cord insertion holes provided opposite to the outer periphery of the case and rotating the case and the cord holder relative to each other.
On the outer periphery of the case, there are provided two cord holding portions that hold the cord so that tension can be applied,
Winding the cord around the cord holder while applying tension to the cord by the cord holding portion ,
A cord winding mechanism for a cord type brush cutter brush cutter , wherein when cutting the grass, the tip of the cord is removed from the cord holder and protruded from the cord insertion hole . The cord insertion hole is provided on a straight line connecting the two cord holding portions, or in a direction opposite to the winding direction of the cord from the cord holding portion,
The cord winding of the brush cutter for a cord type brush cutter according to claim 1, wherein an angle formed by the cord insertion hole and the cord holding portion with respect to the axial center is 0 to 120 degrees. mechanism.   The cord type brush cutter brush cutter head according to claim 1 or 2, wherein the cord holder is a hole or a groove through which the cord can be inserted and having an opening in a substantially radial direction of the case. Cord winding mechanism.   The cord winding mechanism for a brush-type brush cutter for a cord type brush cutter according to claim 1 or 2, wherein the cord holder is a clamping member that clamps the cord.

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