JP2003189720A - Moore blade structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To set a blade carrying out a good weeding for a long term by applying a simple improvement on the blade. <P>SOLUTION: In a blade structure for a mower having the blade 2 rotating around a vertical supporting axis 3 in a housing 1, the blade 2 is formed to have sweepforward angles of θb on its both ends 13, cutting blades 14 formed on the leading edges at both the ends 13 and wind generating pieces 15 formed on the rear edges of both ends 13 are set, approximately parallel with a predetermined space, and an outer end 15a of the wind generating piece 15 is located on a leading position than the inside end 14b of the cutting blade 14 in the rotating direction of the blade. <P>COPYRIGHT: (C)2003,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mower blade structure provided with a blade rotating around a vertical support shaft in a housing. 2. Description of the Related Art Conventionally, as a mower blade structure as described above, for example, as disclosed in Japanese Patent Application Laid-Open No. 6-14635, a blade is formed in a band shape extending straight, It has been common practice to form a cutting blade at the leading edge of the part and to have a wind-generated piece at the trailing edge. However, according to the above-mentioned prior art, as the cutting blade is polished to maintain good sharpness, the cutting edge thereof has a larger receding angle. As a result, during the mowing operation, a component force that pushes the grass to be mowing out of the mowing area of the blade is likely to be generated, which causes a problem that the blade cannot perform good mowing. [0004] It is an object of the present invention to provide a simple improvement to a blade so that good mowing by the blade can be performed for a long period of time. [Means for Solving the Problems] [Structure] In order to achieve the above object, according to the present invention, there is provided a mower blade structure including a blade rotating around a vertical support shaft in a housing. The blades are formed in a bent shape having an advancing angle at both ends thereof, and a cutting blade formed at a front edge of the both ends and a wind generating piece formed at a rear edge thereof are arranged in a substantially parallel posture at predetermined intervals. And, the outer end of the wind generating piece is formed so as to be located forward of the inner end of the cutting blade in the blade rotation direction. According to the first aspect of the present invention, the cutting blades formed at the front edges of both ends of the blade have an advancing angle, so that the grass to be cut can be removed by the blade during the mowing operation. It can be secured in the cutting area and can be cut well. or,
The cutting allowance of the cutting blade is secured between the cutting blade and the wind generating piece, and the cutting blade can be set in a state of having an advancing angle regardless of the polishing of the cutting blade. The blade can be cut well without being pushed out of the cutting region of the blade. Further, the wind-producing pieces formed at the trailing edges of both ends of the blade have a larger advancing angle than those formed at the trailing edges of both ends of the linearly extending strip-shaped blade. The transport wind generated by those wind generating pieces has a more inward directivity than the rotation trajectory drawn at both ends of the blade, and the component directed outward from the rotation trajectory decreases, As a result, the upward component suitable for transporting the cut grass is increased, so that the occurrence of the problem that the cut grass leaks out of the housing can be effectively suppressed, and the wind generated on the vertical wall of the housing close to the blade. It is possible to suppress the generation of noise due to the violent collision of the conveying wind from one piece. [Effect] Therefore, by making a simple improvement to the blade, efficient and good mowing by the blade,
In addition, efficient and good mowing grass transport by the transport wind can be performed for a long time, and noise can be reduced. FIG. 1 shows an overall plan view of a mower, and FIG. 2 shows a longitudinal side view of the mower. The mower has three blades for mowing in a housing 1. 2
Are arranged side by side in the left-right direction so as to be rotatable about a vertical support shaft 3 and in a state where a part of a rotation trajectory 4 drawn at both ends of adjacent blades 2 overlaps.
The power transmitted to the input shaft 6 of the input unit 5 disposed substantially above the center is transmitted to the left and right center support shafts 3 via a pair of bevel gears 7 provided in the input unit 5, and Is transmitted to the left and right support shafts 3 from the support shaft 3 via the belt-type transmission mechanism 8 so that each blade 2 is driven to rotate at a constant speed in the same direction. The housing 1 has a front portion of the ceiling wall 10 bulging upwardly to the left and right so as to have a grass transfer path 9 at a front portion thereof.
Outlet 1 for discharging the cut grass guided by the housing to the outside of the housing 1
1 is formed. As shown in FIGS. 2 and 3, each blade 2
With respect to the center line L of the center 12,
The advance angle θb formed by the center line Lb of both end portions 13 is larger than the advance angle θa formed by the line La connecting the outer end 14a of the cutting blade 14 formed at the front edge of the shaft 3 and the center 3a of the support shaft 3. The cutting blade 14 is bent in a bent shape so that
And a wind-producing piece 15 at a trailing edge formed by bending and raising, in a substantially parallel posture at a predetermined interval, and at an inner end 14 of the cutting blade 14.
b, the outer end 15a of the wind generating piece 15 is formed in a state located on the front side in the blade rotation direction.
And the wind-producing pieces 15 have large advance angles θc and θd that are equal to or substantially equal to the advance angles θb of the both end portions 13. That is, since the cutting blades 14 formed at the leading edges of both ends 13 of each blade 2 have a large advancing angle θc, the grass to be cut is secured in the cutting area of each blade 2 during the mowing operation. The cutting blade 14 can be satisfactorily mowed. Moreover, a polishing allowance for the cutting blade 14 can be secured between the cutting blade 14 and the wind-generated piece 15, and the cutting blade 14 can be polished. Regardless, cutting blade 1
4 can have a large advance angle θc, so that the grass to be cut can be cut well without being pushed out of the cutting area of each blade 2. Further, since the wind generating pieces 15 formed at the trailing edges of both ends 13 of each blade 2 also have a large advancing angle θd, the transport wind generated by these wind generating pieces 15
Each blade 2 has an inward directivity having a larger angle than the rotation trajectory 4 drawn at both ends.
Since the outward component is significantly reduced, and the upward component suitable for transporting the cut grass is correspondingly increased, the occurrence of the problem that the cut grass leaks out of the housing 1 and The generation of noise due to the violent collision of the conveying wind from the wind generating piece 15 against the vertical wall 16 of the housing 1 close to the blade 2 can be effectively suppressed. In short, regardless of the decrease in the advance angle θc of the cutting blade 14 caused by the polishing, the cutting blade 14 is moved to the large advance angle θ.
c so that the grass to be cut can be cut well without being pushed out of the cutting area of each blade 2 at the time of cutting the grass. The transported wind generated by the raised piece 15 allows the cut grass transport path 9 to smoothly move without causing the problem that the cut grass leaks out of the housing 1 and the generation of noise.
The inside can be made to flow and can be discharged from the discharge port 11, so that efficient and good mowing can be performed for a long time while reducing noise. [Alternative Embodiment] The mower may be of a rear discharge type, and the number of blades 2 to be mounted can be variously changed.

[Brief description of the drawings] FIG. 1 is an overall plan view of a mower. FIG. 2 is a longitudinal side view of a mower. FIG. 3 is a plan view of a blade. [Explanation of symbols] 1 Housing 2 blades 3 spindle 13 Both ends 14 Cutting blade 14b inner edge 15 Wind Piece 15a Outer end θb advance angle

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Yoshihiro Kawahara             64 Ishizukita-cho, Sakai-shi, Osaka Kubo Co., Ltd.             Inside the Ta Sakai Factory F term (reference) 2B083 AA02 BA11 CA02 CA09

Claims (1)

Claims: 1. A mower blade structure comprising a blade rotating about a vertical support shaft in a housing, wherein the blade is bent at both ends with an advancing angle. It is formed in a shape, the cutting blade formed at the front edge of the both ends and the wind generating piece formed at the rear edge are in a substantially parallel posture at a predetermined interval, and the outer end of the wind generating piece is A mower blade structure formed so as to be located forward of the inner end of the cutting blade in the blade rotation direction.