JPH0555838U - Moor blade - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the sharpness of the mower blade that rotates around the vertical axis. [Structure] The cutting edge 3 of the blade 2 is formed in a shape along the radiation a centered on the rotation axis X or on the lower side in the blade rotation direction with respect to the radiation a.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a walking mower or a riding mower blade.

[0002]

[Prior Art]

 Conventionally, the blade of Mower has been a bar blade having a cutting edge at the front edge of a strip-shaped plate-shaped body, as disclosed in Japanese Utility Model Laid-Open No. 1-60633.

[0003]

[Problems to be solved by the device]

 Since the leading edge of the cutting edge has a receding angle, that is, a clearance angle, with respect to the radiation centered on the axis of rotation, a force component is exerted on the lawn grass outward in the radial direction, and the cutting is performed. There was a drawback in that the grass to be cut escaped radially outward along the front edge of the blade edge, resulting in poor sharpness. Therefore, it is conceivable to reduce the wall thickness of the bar blade as much as possible and to improve the sharpness of the blade by rotating it at a high speed. is there. The present invention is intended to provide a mower blade having a sharp edge without deteriorating durability.

[0004]

[Means for Solving the Problems]

 To achieve the above object, the present invention is characterized in that the blade tip has a shape in which the blade edge is positioned along the radiation centered on the rotation axis or is positioned on the lower side in the blade rotation direction with respect to the radiation. There is.

[0005]

[Action]

 Positioning the blade edge along the radiation centered on the axis of rotation or on the lower side in the blade rotation direction with respect to the radiation eliminates the clearance angle and cuts the grass without letting it escape radially outward. be able to.

[0006]

[Effect of the device]

 As a result of the above configuration, the sharpness can be sharpened without lowering the durability, as in the case of rotating the thin bar-type blade at high speed to improve the sharpness.

[0007]

【Example】

 Hereinafter, an embodiment of the present invention will be described with reference to a mid-mount type riding mower mounted between front and rear wheels of a traveling body. As shown in FIG. 1, the mower M mounted between the front and rear wheels of the traveling machine body is configured by incorporating three blades 2 which rotate around the longitudinal axis X in the cutting blade housing 1. There is. The blade 2 has a blade edge 3 on the front edge in the rotational direction of the blade 2, that is, on the lower side in the rotational direction of the blade, and a blade 4 on the rear edge, that is, on the upper side in the rotational direction of the blade. The blade 2 is configured such that the cutting edge 3 thereof is gradually curved radially outward with respect to a radiation line a centered on the rotation axis X of the blade 2 to the lower side in the blade rotation direction. The entire structure is substantially S-shaped. The blade 4 of the blade 2 is formed by bending the trailing edge of the blade 2. According to the blade 2 having the above structure, the cutting edge 3 of the blade 2 is gradually curved outwardly in the radial direction with respect to the radiation a centered on the rotation axis X of the blade 2 toward the lower side in the blade rotation direction. By forming the sickle shape, it is easy to carry grass around, and therefore, the standing blade of the blade 4 for conveying grass clippings can be made small and the noise caused by the blade 4 can be made small.

[Other Embodiments] As shown in FIG. 2, the blade edge of the blade tip 3 of the blade 2 is formed in a wavy shape, and the blade edge 3a on the radially inner side is centered on the rotation axis X of the blade 2. The blade edges 3b and 3c on the outer side in the radial direction with respect to the blade edge 3a may be formed as blade edges parallel to the reference blade edge 3a. Further, the blade edges 3b and 3c other than the reference blade edge 3a may be configured along the radiation a centered on the rotation axis X of the blade 2.

It should be noted that reference numerals are added to the claims of the utility model for convenience of comparison with the drawings, but the invention is not limited to the configuration of the accompanying drawings by the entry.

[Brief description of drawings]

[Figure 1] Bottom view of mower

FIG. 2 is a plan view of a cutting blade showing another embodiment.

[Explanation of symbols]

 2 Blade 3 Blade edge a Radiation X Rotation axis

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Minoru Kyotani 64, Ishizukitamachi, Sakai City, Osaka Prefecture Kubota Sakai Factory Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A blade of a mower which rotates about a vertical axis, wherein a cutting edge (3) of the blade (2) is along a radiation (a) having a rotation axis (X) as a center, or radiation. A mower blade configured to be positioned on the lower side in the blade rotation direction with respect to (a).