JPH059229U - Rotary blade of mower - Google Patents

Abstract

(57) [Summary] [Structure] In the disk-shaped rotary blades 31, 35 attached to the lower ends of the rotary shafts 34, 38 in the mower, the cylindrical drums 32, 36 are provided on the upper surfaces of the rotary blades 31, 35. Are provided integrally with each other, and the ridge portions 3 along the vertical direction are provided at a plurality of circumferential positions on the outer peripheral surfaces of the drums 32 and 36.
3, 37 are integrally provided. [Effect] The grass flowing into the rotary blades 31, 35 tries to move toward the rotary shafts 34, 38 so that the cylindrical drum 32,
It can be blocked by 36, and by the protrusions 33, 37 in the vertical direction on the outer peripheral surfaces of the drums 32, 36, the grass can be shaken off to the outside by sending it, and thus the grass can be effectively blown off, thus providing a smooth rotation function. Can be guaranteed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a disc-shaped rotary blade in a mower.

[0002]

[Prior Art]

 A lawn mower provided with a disk-shaped rotary blade attached to the lower end of a rotary shaft is known from Japanese Patent Publication No. 61-59686. In addition, a long blade-shaped cutting blade is attached to the lower end of the rotary shaft via a hub, and rib-shaped projections along the up-down direction for reinforcement are integrally formed at diametrically opposite points on the outer peripheral surface of the hub. It is known from US Pat. No. 3,044,241.

[0003]

[Problems to be solved by the device]

 By the way, in a mower, there is a problem that the cut grass is wound around the rotary shaft of the disk-shaped rotary blade or the long-piece-shaped cutting blade, and the rotation is hindered. However, even if the rib-shaped projections are provided on the outer peripheral surface of the hub having a small diameter as disclosed in Japanese Patent No. 241, the problem cannot be solved.

Therefore, an object of the present invention is to prevent a grass from wrapping around a rotary shaft of a mowing machine having a disc-shaped rotary blade, and to shake off the grass flowing above the rotary blade to the outside. The purpose is to provide a rotary blade that ensures a smooth rotation function.

[0005]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention provides a disk-shaped rotary blade attached to the lower end of the rotary shaft of a mower, and a cylindrical drum is integrally provided on the upper surface of the rotary blade, and the drum is also provided. It is characterized in that a plurality of protrusions along the vertical direction are integrally provided at a plurality of positions on the outer peripheral surface in the circumferential direction.

[0006]

[Action]

 A cylindrical drum is integrated with the upper surface of the disk-shaped rotary blade, and further, protrusions along the vertical direction are integrated with multiple points in the circumferential direction on the outer peripheral surface of the drum, so that it flows above the rotary blade. The cylindrical drum prevents the grass from moving toward the rotary shaft, and the vertical protrusions on the outer peripheral surface of the drum feed the grass so that the grass is shaken off to the outside and effectively blown off.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 showing the schematic appearance of a mower to which the present invention is applied, 1 is a machine body, 3 is a wheel, 5 is a handle, 7 is a support frame, 9 is a steered wheel, and 20 is a cutting blade device. As shown in FIG. 4, an engine 11 is mounted on the machine body 1, and the engine 11 has a crank shaft 12 placed vertically and a drive pulley 13 at the lower end of the crank shaft 12, and a cutting blade device 20 to be described later. Besides, the power can be transmitted to the pair of left and right wheels 3 and 3.

As shown in FIGS. 1 and 2, the machine body 1 includes a pair of left and right handles 5 and 5 standing upright to the rear, and a support frame 7 formed by a pipe extending forward. The support frame 7 is a machine body. 1 has a branch portion 7a extending from the right side thereof, and a steered wheel support arm 8 is provided at a front end of the support frame 7 via a vertical shaft 6. Although not shown, the steering wheel support arm 8 is provided with a vertical position adjusting mechanism for the steering wheels 9. A steering operation lever 15 is provided near one of the handles 5, and a steering arm 16 is provided on the upper end of the vertical shaft 6 at the front end of the support frame 7. A tie rod 17 is installed between the arms 16.

A cutting blade device 20 is disposed in front of the machine body 1 and behind the steered wheels 9, that is, a housing of the cutting blade device 20 is coupled and supported at a front-rear intermediate portion of the support frame 7. .. In the embodiment, the housing of the cutting blade device 20 is composed of a fixed housing 21 and a swing housing 25, which are divided into left and right as shown in an enlarged view in FIG. The fixed housing 21 has its upper surface portion 22 fixed to the branch portion 7a extending to the right side of the body 1 of the support frame 7 at its rear portion. The swing housing 25 has an upper surface portion 26 on which the swing housing 25 extends. The hinge shaft 29 (see FIGS. 3 and 5) in the front-rear direction is swingably supported as described later.

As shown in FIG. 6, the hinge shaft 29 is supported by a plate 19 vertically extending from a bracket 18 fixed to the front and rear intermediate portions of the support frame 7. Here, the fixed housing 21 is opened in the front-rear direction, and the front surface of the upper surface portion 22 is an upward inclined surface portion 23, and the side surface portion extends in the front-rear direction in a substantially straight line. 24. The swing housing 25 is also opened in the front-rear direction, and the front portion of the upper surface portion 26 thereof is an upward inclined surface portion 27 and the rear portion of the side surface portion thereof is a concave curved portion 28 for disposing a tail wheel.

As shown in FIGS. 7 and 8, the disk-shaped main rotary blade 31 is housed in the rear half of the fixed housing 21, and the disk-shaped sub rotary blade is housed in the front half of the swing housing 25. Holds 35. As shown in an enlarged view in FIG. 9, both rotary blades 31 and 35 have cylindrical large-diameter drums 32 and 36 integrated on the upper surface thereof, and the outer peripheral surfaces of the drums 32 and 36 have a cross section of approximately V. A plurality of ridges 33 and 37 (three in the embodiment) are provided at equal intervals in the circumferential direction to prevent grass from being wrapped and blown off by joining and fixing plate-like pieces extending vertically in the mold. Is a main rotary shaft, and 38 is a sub rotary shaft. The main rotating shaft 34 projecting on the rear half of the fixed housing upper surface 22 is provided with a driven pulley 41 and a drive pulley 43 thereon, and a sub-rotation projecting on the front half of the swing housing upper surface 26. The shaft 38 is provided with a driven pulley 45.

As shown in FIG. 4, the drive pulley 13 at the lower end of the crankshaft 12 of the engine 11 and the driven pulley 41 of the main rotary shaft 34 are wound around the first power transmission belt 42, and the main rotary shaft A second power transmission belt 46 is wound around the drive pulley 43 of 34 and the driven pulley 45 of the sub-rotating shaft 38. In addition, a first tension roller 51 that is in pressure contact with the outer periphery of the first power transmission belt 42 to apply tension is provided, and 52 is a first tension arm thereof. Further, a second tension roller 55 is provided on the outer peripheral side of the second power transmission belt 46 so as to apply pressure to the second power transmission belt 46, and 56 is a second tension arm thereof.

Here, as shown in FIG. 3, the second tension arm 56 supporting the second tension roller 55 is pivotally supported by a stay 58 protruding from the bracket 18 of the support frame 7 via an inclined shaft 57. A tension coil spring 59 is stretched between the second tension arm 56 and a stay 39 provided around the hinge shaft 29 on the swing housing upper surface 22. In the above description, as shown in FIG. 7, the auxiliary rotary blade 35 on the left side is arranged in front of the main rotary blade 31 on the right side with respect to the traveling direction of the mower (arrow F), and these rotary blades 31, 35 are arranged. Is overlapped by a predetermined amount in the left-right direction, and both rotary blades 31 and 35 rotate in plan view from the front auxiliary rotary blade 35 side toward the rear main rotary blade 31 side on the front side. That is, in the embodiment, clockwise (arrows r, r).

Further, as shown in FIG. 3, a tail wheel 61 is disposed on the concave curved portion 28 formed at the rear portion of the side surface of the swing housing 25, that is, the tail wheel 61 is a tail wheel support. The vertical shaft 63 of the arm 62 is inserted through a vertical support pipe 66 fixed at the rear end of a front-rear rod 65 fixed on the rear part of the swing housing upper surface 26, and the height can be adjusted by a bolt 68. Is installed in. 69 is a lock nut. A support pipe 67 in the front-rear direction is also fixed to the middle portion of the rod 65 on the upper surface 26 of the swing housing, and a swing amount adjusting rod 71 is inserted into the support pipe 67 at an L-shaped bent portion 72 at its lower end. Is pivoted by. As shown in FIG. 6, the swing amount adjusting rod 71 has a threaded portion 73 formed at an upper end thereof, a nut 74 is screwed to the threaded portion 73, and a pin is inserted into the screw portion 73 above the nut 74. A hole 75 and a pin insertion hole 76 in the middle portion are formed.

The upper part of the swing amount adjusting rod 71 is inserted into a locking groove 79 of a locking piece 78 protruding from the bracket 18 of the support frame 7, and the split pin 77 is inserted into any of the pin insertion holes 75 and 76. Insert and lock the crab. That is, like the main rotary blade 31, when the sub rotary blade 35 is made substantially horizontal, the split pin 77 is inserted into the lower pin insertion hole 76 and the split pin 77 is abutted on the upper surface of the locking piece 78. When the auxiliary rotary blades 35 are brought into contact with each other and the auxiliary rotary blades 35 are tilted to a certain degree in accordance with the side portions of the upper surface of the ridge as will be described later, the split pin 77 is inserted into the pin insertion hole 75 of the threaded portion 73, and the engagement is performed. The nut 74 can be brought into contact with the upper surface of the stopper 78. In order to prevent the swing housing upper surface 26 from rotating more than the horizontal state, a stopper 81 that abuts against the swing housing upper surface 26 is provided on the fixed housing upper surface 22, as shown in FIG.

Next, a grass cutting operation on the upper surface of the ridge by the above mower will be described. First, as shown in FIG. 10, the grass mower to which the present invention is applied is for cutting grass grown on the upper surface of a ridge. Specifically, the upper surface of the ridge is reciprocated once to make an approximately horizontal plane at the center of the upper surface of the ridge. And the grass on the left and right of the roughly sloped surface. On the left and right slopes of the ridge, the grass is cut using a mower (not shown).

During the movement of the upper surface of the ridge prior to the mowing work, the upper part of the swing amount adjusting rod 71 pivotally supported on the upper surface 26 of the swing housing is engaged with the engaging groove of the engaging piece 78 provided on the bracket 18 of the support frame 7. 79, insert the split pin 77 into the lower pin insertion hole 76, and bring the split pin 77 into contact with the upper surface of the locking piece 78, so that the swing housing 25 is substantially horizontal like the fixed housing 21. Put in a state. At this time, the stopper 81 provided on the fixed-side housing upper surface 22 comes into contact with the swing housing upper surface 26 to prevent the swing housing upper surface 26 from rotating more than the horizontal state. As a result, like the main rotary blade 31, the sub rotary blade 35 also becomes substantially horizontal, and in this state, the position of the steered wheels 9 with respect to the steered wheel support arm 8 at the front end of the support frame 7 is set to the lower side, so that the cutting blade device 20 is lifted from the ground and moved. During this movement, the operation lever (not shown) provided on the handle 5 swings the first tension arm 52 that holds the first tension roller 51 of the first power transmission belt 42 to swing the first power transmission belt 42. The first tension roller 51 is separated from the outer peripheral side to cut off the power transmission to the cutting blade device 20. In the case of mowing work on a flat ground, the power transmission state is set.

On the upper surface of the ridge, the position of the steered wheel 9 with respect to the steered wheel support arm 8 at the front end of the support frame 7 is set upward, the cutting blade device 20 is brought close to the upper surface of the ridge, and the swing amount adjusting rod 71 is moved. The split pin 77 is pulled out from the pin insertion hole 76 so that the nut 74 can come into contact with the upper surface of the locking piece 78. At this time, the split pin 77 is inserted and held in the pin insertion hole 75 of the screw portion 73. As a result, as shown in FIG. 10, with respect to the fixed-side housing 21 and the main rotary blade 31 which face the substantially horizontal plane of the central portion of the ridge, by the rotation around the hinge shaft 29 (see FIGS. 5 and 6), The swing housing 25 and the sub-rotary blade 35 are in an inclined state that is aligned with the side portion of the upper surface of the ridge. In this state, the tail wheel 61 facing the concave curved portion 28 formed on the rear portion of the side surface of the swing housing 25 is in the grounded state.

Then, the first tension roller 51 is brought into pressure contact with the first power transmission belt 42 to transmit power to the mowing blade device 20, and when the grass mower is moving forward, the tail wheel 61 is grounded so that the upper surface of the ridge is covered. The swing housing 25 and the auxiliary rotary blade 35 can be swung by the stroke in which the nut 74 of the swing amount adjusting rod 71 comes into contact with the upper surface of the locking piece 78, following the shape of the side portion. Further, following the swing motion of the swing housing 25, the second tension arm 56 pivotally supported by the stay 58 projecting on the bracket 18 of the support frame 7 via the tilt shaft 57, the hinge shaft 29 of the swing housing upper surface 22. The tension force of the tension coil spring 59 stretched between the stay 39 and the stay 39 provided around the upper portion causes the second tension roller 55 to oscillate, so that the pressure contact state of the second tension roller 55 with respect to the second power transmission belt 46 is always obtained properly. Be done.

Moreover, as shown in FIG. 7, the auxiliary rotary blade 35 on the left side is arranged in front of the main rotary blade 31 on the right side with respect to the traveling direction of the mower (arrow F), and both rotary blades are arranged. 31 and 35 are overlapped in the left-right direction by a predetermined amount, and the rotation directions of both rotary blades 31 and 35 are both viewed in plan from the front auxiliary rotary blade 35 side toward the rear main rotary blade 31 side on the front side. By rotating clockwise (arrows r, r) so that it rotates, the grass on the side of the upper surface of the ridge cut by the preceding sub-rotary blade 35 is moved to the main direction following the direction of rotation indicated by the arrow r. After being moved to the front of the rotary blade 31, it can be moved to the side by the rotation direction shown by the same arrow r together with the grass in the center of the upper surface of the ridge cut by the main rotary blade 31. Subsequently, the cut grass can be discharged backward along the grass discharge guide wall 24 formed by the side wall of the fixed-side housing 21 extending substantially in the front-rear direction by the rotation direction of the main rotary blade 31 indicated by the arrow r. , Can be aligned in a line at the center of the upper surface of the ridge behind the mower.

The above-mentioned mowing work is carried out by reciprocating once on the upper surface of the ridge, whereby it is possible to mow the grass on the substantially horizontal plane of the central part of the ridge upper surface and the left and right substantially inclined surfaces. , The grass cut in the center of the upper surface of the ridge is aligned. Therefore, the subsequent work of collecting grass can be efficiently performed in the central part of the front of the ridge.

During the above-mentioned mowing work, the disc-shaped rotary blades 31, 35 have cylindrical large-diameter drums 32, 36 integrated on the upper surface thereof, and the outer peripheral surfaces of the drums 32, 36. In addition, in the embodiment, since the plate-shaped pieces extending in the vertical direction and having the substantially V-shaped cross section are provided with three ridges 33 ..., 37 ... At first, the cylindrical large-diameter drums 32 and 36 can prevent the rotating shafts 34 and 38 from flowing over the parts 31 and 35 and being wound around the rotating shafts 34 and 38. Moreover, the taper surface of each of the projecting ridges 33, 37, ... Having a substantially V-shaped cross section on the outer peripheral surface of each of the large-diameter drums 32, 36 allows the grass to be shaken off by feeding. That is, the grass can be effectively blown off along the rotation direction indicated by the arrow r. In this way, by preventing the grass from wrapping around the rotary shafts 34 and 38 and effectively blowing off the grass, the smooth rotating function of both rotary blades 31 and 35 can be guaranteed. There is.

It is needless to say that the specific detailed structure and the like can be appropriately changed other than the embodiment. For example, contrary to the embodiment, when the sub rotary blade is arranged on the right side in the traveling direction with respect to the main rotary blade, the rotation direction thereof is counterclockwise in plan view. Further, it is needless to say that the present invention can be applied to not only mowers for ridges but also mowers for other purposes.

[0024]

[Effect of the device]

 As described above, according to the rotary blade of the mower of the present invention, the cylindrical drum is integrally formed on the upper surface of the disk-shaped rotary blade, and the outer peripheral surface of the drum is further vertically aligned at a plurality of circumferential positions. Due to the structure in which the protruding ridges are integrated, the grass that flows above the rotary blade can be prevented from going toward the rotary shaft by the cylindrical drum, and the ridges in the vertical direction on the outer peripheral surface of the drum can be prevented. This allows the grass to be swung outward as it is sent, effectively blowing it away, thus ensuring a smooth rotation function.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing the appearance of a mower to which the present invention is applied.

FIG. 2 is a schematic plan view of the same.

FIG. 3 is an enlarged perspective view of a power transmission device and a housing part.

FIG. 4 is a perspective view showing a power transmission device from the engine to the rotary blades.

FIG. 5 is a vertical sectional front view illustrating the swing function of the housing.

[FIG. 6] Similarly, a rear view of the longitudinal section of the main part.

FIG. 7 is a plan view showing the arrangement of rotary blades.

FIG. 8 is a perspective view showing the inside of the housing from below.

FIG. 9 is an enlarged perspective view of a rotary blade portion according to the present invention.

FIG. 10 is a schematic front view illustrating an upper surface mowing work of a ridge by a mowing machine to which the present invention is applied.

[Explanation of symbols]

1 ... Airframe, 3 ... Wheels, 5 ... Steering wheel, 7 ... Support frame, 9 ... Steering wheel, 11 ... Engine, 20 ... Cutting blade device, 2
1, 25 ... Housing, 31, 35 ... Disc-shaped rotary blade, 3
2, 36 ... Cylindrical drum, 33, 37 ... Ridge portion, 34,
38 ... rotary shaft.

Claims (1)

[Claims for utility model registration] [Claim 1] A disk-shaped rotary blade attached to the lower end of a rotary shaft of a mower, wherein a cylindrical drum is integrally provided on the upper surface of the rotary blade, and A rotary blade for a mower, characterized in that a plurality of circumferentially-arranged protrusions along the vertical direction are integrally provided on the outer peripheral surface of the drum.