JP2010057397A - Lawn mower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lawn mower which can largely change a lawn mowing height in a simple structure to adjust the lawn mowing height. <P>SOLUTION: There is provided the lawn mower whose front wheel keeps a conventional lawn mowing height-adjusting mechanism disposed, characterized in that a plurality of pivotally supporting portions pivotally supporting the wheel shaft of a rear wheel in a holder supporting the rear wheel can be disposed at a plurality of places, and the height on the rear wheel side can be changed at a plurality of steps. Thus, a user for the lawn mower can largely combine the adjusting width of a lawn mowing height by a conventional mowing height-adjusting mechanism disposed on the front wheel with the change of the rear wheel side height of the rear wheel side by selecting the holder shaft position of the rear wheel-supporting holder for supporting the rear wheel, whereby the lawn mowing height can largely be changed to adjust the lawn mowing height. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a lawn mower, and more particularly, to a lawn mower capable of adjusting a lawn mowing height.

  As shown in FIG. 6, in the conventional lawn mower disclosed in Patent Document 1, a mechanism for adjusting the lawn mowing height is provided on the front wheel of the lawn mower. In FIG. 6, a pair of lever members 107 that can rotate about the pivot 106 are provided on the left and right side plates of the lawn mower body, and the pair of lever members 107 are connected by a connecting plate 108. It is connected. The connecting plate 108 is provided with an adjusting knob 111. When the adjusting knob 111 is moved, the connecting plate 108 is moved, and both lever members 107 are rotated around the pivot 106 at the same time. . An axle 109a provided in parallel to the connecting plate 108 is attached to the lever member 107. Since the front wheel 109 is attached to the axle 109a, the front wheel 109 moves up and down by the movement of the adjustment knob 111, The grass cutting height is adjustable.

Japanese Patent Laid-Open No. 11-103634

  However, when cultivating turf with a short length, use it while adjusting the height of the cutting blade while the height of the chopping blade is low. However, in the above-mentioned lawn mower, the range of adjustment knob movement is fixed, and the range of adjustment of the lawn mowing height is naturally determined. Therefore, there are cases where the above-mentioned demands cannot be met. In addition, if the adjustment knob movement range is designed to be large in order to meet that demand, the user can adjust the lawn mowing height to a large extent even if design restrictions arise or the movement range can be increased. In order to do this, there was a problem that the adjustment knob had to be operated greatly.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a lawn mower that can greatly change the lawn mowing height with a simple configuration.

  In order to solve the above problems, the present invention provides a holder for supporting the rear wheel on the rear wheel side of the lawn mower so that the height on the rear wheel side can be changed to a plurality of stages. In other words, the front wheel is equipped with a conventional lawn mowing height adjustment mechanism, the holder that supports the rear wheel is provided with multiple shaft support parts that support the axle of the rear wheel, and the height on the rear wheel side is set in multiple steps. A lawnmower that can be changed is provided. With this configuration, the lawn mower user can adjust the lawn mowing height adjustment mechanism using the conventional lawn mowing height adjustment mechanism installed on the front wheel and the support position of the holder that supports the rear wheel. By combining the height change on the rear wheel side by selection, the grass cutting height can be greatly changed to adjust the grass cutting height.

  According to the present invention, there is an effect that the cutting height of the lawn can be adjusted by greatly changing the cutting height of the lawn with a simple configuration.

  Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings.

  In FIG. 1, 1 is a lawn mower according to the present invention, 2 is a handle for operating the lawn mower 1 in lawn mowing work, 3 is a front wheel of the lawn mower 1, and 4 is a rear wheel of the lawn mower 1. . Reference numeral 5 denotes a knob of a preparation mechanism that adjusts the height of the front wheel 3, for example, as disclosed in Patent Document 1. 11 is a bag for collecting the cut turf grass.

  FIG. 2 shows a first embodiment according to the present invention. A rear wheel 4 is rotatably supported on an axle 4a, and the axle 4a is located behind a main body chassis 8 inside a housing cover 6 of the lawn mower 1. .. Are inserted into one of a plurality of shaft support portions 7a, 7a,... Provided on a holder 7 fixed with a bolt or the like (not shown) on a mounting portion 8a protruding downward on the wheel side.

  Next, the height adjustment of the lawn mower according to the first embodiment of the present invention will be described. The adjustment mechanism shown in FIG. 6 mounted on the front wheel 3 is described in detail in Patent Document 1 and will be omitted. The height adjustment mechanism of the rear wheel 4 according to the present invention will be described below.

  When turf is cultivated short, it is necessary to set the lawn mowing height low, so the axle 4a of the rear wheel 4 is inserted into the hole 7a closer to the chassis 8 of the holder 7 and the holder 7 is attached to the chassis 8. It attaches to the attaching part 8a of this with the volt | bolt etc. which are not illustrated. Further, when turf is cultivated for a long time, it is necessary to set the grass cutting height high, so the axle 4a of the rear wheel 4 is inserted into the hole 7a far from the chassis 8 of the holder 7 and the holder 7 is It attaches to the attaching part 8a of the chassis 8 with the bolt etc. which are not shown in figure. In this state, the user moves the knob 5 to adjust the height of the cutting blade optimum for the lawn mowing work.

FIG. 3 is a component diagram of the holder 9 constituting the second embodiment according to the present invention. The shaft support portion 9a is a hole formed in the holder 9 so as to support the axle 4a of the rear wheel 4, and the shaft support portion. 9bb is another shaft support portion that supports the axle 4a of the rear wheel 4, and is formed in a semi-cylindrical shape in the axial direction of the shaft support portion 9a at the center of the plane 9b.
Further, 9c and 9d are contact surfaces that contact the attachment portion 8a when the holder 9 is attached to the attachment portion 8a, and 9e is a hole for receiving a bolt for attaching the holder 9 to the attachment portion 8a.

  FIG. 4 shows a state in which the distance between the axle 4a and the main body chassis 8 is reduced and the height of the rear portion of the lawn mower 1 is lowered. The contact surface 9c of the holder 9 and the side surface 8d of the mounting portion 8a contact each other. In this way, the axle 4a is fixed by a bolt or the like (not shown), and the axle 4a is a semi-cylindrical shaft formed on the shaft support 9bb formed at the center of the plane 9b of the holder 9 and the lowermost end surface 8c of the mounting portion 8a of the body chassis 8. It is pinched and supported by the support 8cc.

  FIG. 5 shows a state in which the distance between the axle 4a and the main body chassis 8 is increased to increase the height of the rear portion of the lawn mower 1, and the contact surface 9d of the holder 9 and the lowermost end surface 8c of the mounting portion 8a are The holder 9 is fixed to the mounting portion 8 a with a bolt or the like (not shown) so as to abut, and the axle 4 a is inserted through the shaft support portion 9 a of the holder 9 and supported.

  Next, height adjustment of the lawn mower according to the second embodiment of the present invention will be described. The adjustment mechanism shown in FIG. 6 mounted on the front wheel 3 is described in detail in Patent Document 1 and will be omitted. The height adjustment mechanism of the rear wheel 4 according to the present invention will be described below.

  When turf is cultivated short, it is necessary to set the lawn mowing height low, so that the axle 4a of the rear wheel 4 is formed at the center of the plane 9b of the holder 9 as shown in FIG. The holder 9 is attached to the attachment portion 8a of the main body chassis 8 with a bolt or the like (not shown) so that the contact surface 9c of the holder 9 and the side surface 8d of the attachment portion 8a contact each other with the support portion 9bb pivotally supported. By mounting in this way, the axle 4a of the rear wheel 4 is composed of a shaft support portion 8cc formed at the lowermost end surface 8c of the mounting portion 8a of the main body chassis 8 and a shaft support portion 9bb formed at the center of the plane 9b of the holder 9. Since the holder 9 does not exist between the lowermost end surface 8c of the mounting portion 8a of the main body chassis 8 and the axle 4a of the rear wheel 4, the distance between the axle 4a and the main body chassis 8 is minimized. The rear wheel side of the chassis 8 is positioned low from the ground, and the rear part of the lawn mower 1 is lowered. In this state, the user moves the knob 5 to adjust the height of the cutting blade optimum for the lawn mowing work. As a result of the measurement, the height of the cutting blade could be adjusted from about 5 mm to about 25 mm.

  When turf is cultivated longer, it is necessary to set the lawn mowing height high, so that the axle 4a of the rear wheel 4 is inserted through the shaft support 9a of the holder 9 as shown in FIG. The holder 9 is attached to the attachment portion 8a of the body chassis 8 with a bolt (not shown) so that the contact surface 9d of the holder 9 and the lowermost end surface 8c of the attachment portion 8a abut. At this time, a part of the holder 9 indicated by L in the drawing exists between the lowermost end surface 8c of the mounting portion 8a of the main body chassis 8 and the axle 4a of the rear wheel 4. That is, the distance between the lowermost end surface 8c and the axle 4a is increased by the length L, the distance between the axle 4a and the main chassis 8 is increased by that amount, and the rear wheel side of the main chassis 8 is higher by the length L from the ground. Positioned in position, the rear of the lawn mower 1 is raised. In this state, the user moves the knob 5 to adjust the height of the cutting blade optimum for the lawn mowing work. As a result of the measurement, the height of the cutting blade could be adjusted from about 30 mm to about 50 mm.

  The lawn mower according to the present invention can change the lawn mowing height by changing the lawn mowing height greatly with a simple configuration, so that the lawn mower is cultivated longer with one lawn mower. It is extremely useful because it can cope with cases where grass is cultivated shortly.

It is a side view of the lawn mower concerning this embodiment. It is a fragmentary sectional view in breaking line AA of the side view shown in FIG. 1 of the 1st Example. It is a components figure of the holder components of the 2nd example. It is a fragmentary sectional view in breaking line AA of the side view shown in FIG. 1 of the 2nd Example. It is a fragmentary sectional view in breaking line AA of the side view shown in FIG. 1 of the 2nd Example. FIG. 6 is a cross-sectional view of a front wheel height adjusting mechanism disclosed in Patent Document 1;

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lawn mower 2 Handle 3 Front wheel 4 Rear wheel 4a Axle 5 Knob 6 Housing cover 7, 9 Holder 8 Body chassis 8a Mounting part 8c Bottom end surface

Claims (2)

A lawn mower equipped with a lawn mower blade height adjustment mechanism on the front wheel side, provided with a mounting portion on the lower part of the main body chassis on the rear wheel side of the lawn mower, and a shaft for pivotally supporting the axle of the rear wheel A lawnmower characterized in that a holder provided with a plurality of support portions is attached to the attachment portion so that the height on the rear wheel side can be adjusted. The lawnmower according to claim 1, further comprising a holder that can be attached in at least two ways, when a portion of the holder is present and when not present between the lowermost end surface of the attachment portion and the axle.

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