JP2011000077A - Implement for rubbing-in sand for lawn - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an implement which is extremely simple in structure and allows overall uniform rubbing-in of sand even when there are large and small undulations on the lawn ground surface, manufacture thereof at low cost, and application thereof to various working vehicles used for maintenance of lawn as the implement for rubbing-in the sand for the lawn.SOLUTION: The implement for rubbing-in the sand for the lawn includes oblong grounding brushes 3 mounted through a pair of right and left supporting shafts 2 and 2 composed of a spring steel material on the rear of a working vehicle 1. In the implement, the grounding brushes 3 are composed so as to be brought into pressure contact with the ground surface G by spring elasticity of both the supporting shafts 2 and 2.

Description

  The present invention relates to a mesh sand rubbing device used for rubbing sprayed mesh sand (also referred to as mesh soil) between turf grass in a lawn such as a golf course.

  In general, in a lawn such as a golf course, in order to improve the rooting of the lawn, it is regularly sprayed with sand and rubbed between turf grass. 2. Description of the Related Art Conventionally, a method of pulling a rubbing mat (Patent Document 1) or a brush frame (Patent Documents 2 to 4) with a work vehicle has been widely used as a means for mechanically rubbing such mesh sand. A green maintenance work device has also been proposed in which a brush frame is pivotally supported at the lower part of the vehicle body of a work vehicle so that the brush frame can swing vertically, and the brush frame is pressed against the lawn ground via a coil spring (patent). Literature 5, 6).

Japanese Patent Laid-Open No. 9-37605 JP-T 8-511435 Japanese Patent Laid-Open No. 9-238505 JP-A-10-215604 Japanese Utility Model Publication No. 4-136005 JP-A-6-319302

  However, since golf course greens have large and small undulations, the conventional method of pulling the rubbing mat and brush frame with the work vehicle above causes the rubbing mat and brush frame when the work vehicle passes the undulating portion. This often causes the sand to be rubbed intermittently, which prevents the uniform green sand from being rubbed over the entire green, and results in a striped pattern with sufficient and insufficient rub. There was a problem that the appearance also deteriorated. Further, in the proposed green maintenance work device, the brush frame can be prevented from jumping up, but the mounting portion of the brush frame has a complicated structure, and the work vehicle requires a special specification for rubbing sand. However, the production cost and the management cost of the lawn are expensive.

  In view of the circumstances described above, the present invention is a grass lawn rubbing device that can perform uniform sand rubbing as a whole even if the lawn ground has large and small undulations, and is extremely structurally simple. An object of the present invention is to provide a vehicle that can be manufactured at a low cost and can be applied to various work vehicles used for lawn maintenance.

  If means for achieving the above object is shown with reference numerals in the drawings, the grass sand rubbing device according to the invention of claim 1 is provided at the rear part of the work vehicle 1 with a pair of left and right spring steel materials. A horizontally long grounding brush 3 attached via the support shafts 2 and 2 is provided, and the grounding brush 3 is configured to be pressed against the ground G by the spring elasticity of the both support shafts 2 and 2. .

  According to a second aspect of the present invention, in the grass sand rubbing apparatus according to the first aspect, the support shaft 2 is held on the work vehicle 1 side at the front end portion 2a and extends rearward of the work vehicle 1. The grounding brush 3 is supported by the end 2b.

  According to a third aspect of the present invention, in the grass sand rubbing apparatus according to the first or second aspect, the intermediate portion of the support shaft 2 is bent in a plurality of stages having a zigzag shape in side view.

  According to a fourth aspect of the present invention, in the grass sand rubbing apparatus according to any one of the first to third aspects, the support shaft 2 is provided with a vertical tilting means, and the grounding brush 3 is grounded by the vertical tilt of the support shaft 2. And a non-grounded state lifted upward.

  Next, effects of the present invention will be shown with reference numerals in the drawings. First, according to the grass sand rubbing device according to the first aspect of the present invention, even when the work vehicle 1 travels on a grassy terrain having a large and small undulation like a golf course green, the grounding brush 3 is spring-loaded. Even if the grounding position and the position of the work vehicle 1 are different from each other in the horizontal inclination of the ground, the grounding brush 3 is independent of the work vehicle 1. Following the inclination of the ground, it tilts in the left-right direction, so that it is possible to evenly rub the sand. Moreover, the spring force that presses the grounding brush 3 against the ground is brought about by the elastic restoring force of the left and right support shafts 2 themselves made of spring steel, and there is no need to use a separate spring member. The mounting structure is extremely simple, and the cost of assembling and manufacturing the mesh sand rubbing mechanism can be reduced accordingly.

  According to the second aspect of the present invention, the support shaft 2 is held on the work vehicle 1 side by the front end portion 2a, and the ground brush 3 is supported by the rear end portion 2b extending rearward of the work vehicle 1. In addition, it is possible to easily assemble the mesh sand rubbing mechanism for various work vehicles used for lawn maintenance, including existing vehicles, in a form that does not hinder the maintenance work. Since the vehicle 1 can be used for a plurality of lawn maintenance work including rubbing sand, the management cost of the lawn can be greatly reduced.

  According to the invention of claim 3, since the support shaft 2 is bent in a plurality of stages having a zigzag shape in side view, sufficient support strength for the ground brush 3 is secured and the ground brush 3 is provided. A large spring force for pressing against the ground can be expressed.

  According to the fourth aspect of the present invention, since the ground brush 3 is switched between the grounded state and the non-grounded state by the vertical tilting means of the support shaft 2, the start and stop of the sanding rubbing operation without removing the grounded brush 3. Can be switched.

It is a side view of the mesh sand rubbing apparatus for lawn concerning one embodiment of the present invention. It is a rear view of the same sand rubbing apparatus. It is a perspective view of the grounding brush attachment part of the same sand rubbing apparatus. It is a disassembled perspective view of the fixture of the support shaft upper end side in the same sand rubbing apparatus. The attachment state of the support shaft upper end side is shown, (a) is a plan view, and (b) is an arrow cross-sectional view of (a). The attachment metal fitting of the lower end side of the support shaft is shown, (a) is a front view and (b) is a side view. It is a vertical side view which shows the attachment state of the support shaft lower end side. It is a side view which shows the work state in the uphill of the same sand rubbing apparatus. It is a side view which shows the working state in the downhill of the same sand rubbing apparatus. It is a side view which shows the movement state under non-working of the same sand rubbing apparatus.

  Hereinafter, an embodiment in which the grass sand rubbing device of the present invention is applied to an existing green cleaning vehicle will be specifically described with reference to the drawings.

  As shown in FIGS. 1 and 2, a work vehicle 1 is a single-seat three-wheeled light vehicle used as a suction-type green cleaning vehicle in a golf course, and contains dust that has fallen leaves and dust sucked at the rear. A tank 11 is mounted. The dust tank 11 is mounted on a pair of left and right substantially inverted V-shaped support frames 12 and 12 erected at the rear part of the vehicle body 10 via two upper and lower levers 13 and 14 each having a round bar shape and a square bar shape on both left and right sides. It is supported. The levers 13 and 14 are pivoted so that the front end is pivotally attached to the upper portion of the support frame 12 and the rear end is pivoted to the lower portion of the dust tank 11 near the rear end of the side surface. A parallelogram link is arranged in parallel, and the dust cylinder 11 is made to extend by operating the air cylinder 15 inserted between the front side of the lower square lever 14 and the vehicle body 10. The vehicle is lifted rearward and obliquely in a fixed posture (see FIG. 10).

  As shown in FIG. 3, the support shaft 2 is fixed to each intermediate portion of the left and right square bar-like levers 14 by the front end portion 2 a via the fasteners 4, and extends to the rear of the vehicle body 10. A horizontally long grounding brush 3 is attached to the rear end portions 2 b and 2 b of both support shafts 2 and 2 via a mounting bracket 5. Each support shaft 2 has a round bar shape made of a spring steel material, and an intermediate portion is bent in three stages, and is sequentially bent downwardly from the upper side by a bent portion 21, an upwardly convex bent portion 22, and a downwardly convex bent portion 23. Side-view zigzag shape.

  As shown in FIGS. 4 and 5, the fastening device 4 has a cylindrical shaft in which a pair of vertical fitting plates 40, 40 each having a downwardly open U-shaped locking portion 40 a on one end side penetrate each other end side. A metal fastening body 4a welded and integrated via 41, a band plate 4b made of an elastic material such as rubber, synthetic resin or metal, and a pair of rectangular metal clamping plates 4c and 4c. Has been. On both lower edges of the engaging portion 40a of each fastening plate 40 of the fastener body 4a facing each other, sandwiching protrusions 42 and 42 projecting to both sides in parallel with the axial direction of the cylindrical shaft 41 are integrally formed. Has been. Each clamping protrusion 42 has one bolt insertion hole 43, and a total of four clamping plates 4c correspond to the bolt insertion holes 43 of the four clamping protrusions 42 of each locking portion 40a. Bolt insertion holes 44- are formed at the four corners. In addition, locking screw holes 45 penetrating in the radial direction are formed at a plurality of locations on the cylinder shaft 41 of the fastener body 4a.

  When the support shaft 2 is attached to the square lever 14, as shown in FIGS. 3, 5, and 6, the engaging portions 40 a of both fitting plates 40, 40 of the fastening body 4 a are connected to the square rod 14. With the belt plate 4b in contact with the lower surface of the rectangular bar-like lever 14, the clamping plate 4c is applied to each locking portion 40a from below, and each bolt insertion hole 44 of the clamping plate 4c is engaged. Then, a bolt 46a is inserted from below into the bolt insertion hole 43 of each clamping protrusion 42, and a nut 46a is screwed and tightened to the protruding upper end of the bolt 46a. Thereby, the square bar-shaped lever 14 is clamped between the fastening tool main body 4 a and the clamping plate 4 c via the belt plate 4 b, and the fastening tool 4 is fixed to the square bar-shaped lever 14. On the other hand, the support shaft 2 inserts the front end portion 2a into the cylinder shaft 41 of the fastener main body 4a, and screwes the lock screws 47 into the respective lock screw holes 45 of the cylinder shaft 41, so By pressing the support shaft 2, the support shaft 2 is fixed.

  As shown in FIGS. 3 and 6, the ground brush 3 includes a horizontally long brush body 31 in which a brush 30 is planted downward, and a pair of angle members fixed along the front and rear side edges of the upper surface of the brush body 31. Two brush frames 3a composed of 32 and 32 are arranged in parallel.

  As shown in FIG. 5, the mounting bracket 5 is made of a substantially rectangular metal thick plate having a fastening ring portion 51 on the upper portion, and the fastening ring portion 51 forms an open ring by a split groove 52 on one side, A screw hole 53 is formed in the vertical direction so as to pass through the split groove 52 from above, and a pair of left and right bolt insertion holes 54, 54 that are permeable in the front-rear direction are provided in the lower part.

  When the grounding brush 3 is attached to the rear end portion 2b of the support shaft 2, as shown in FIGS. 3 and 7, the vertical pieces 32a of each angle member 32 of each brush frame 3a are placed at the same position on the outer surface side on the left and right sides. The bolt mounting bracket 5 is fixed through the bolt 33a and the nut 33b, respectively, and at the same time, the two brush frames 3a and 3a are connected to each other. On the other hand, the cylindrical shaft 6 is fitted into the rear end portion 2b of the support shaft 2, and the lock screw 62 is screwed into the locking screw holes 61 provided in a plurality of locations on the cylindrical shaft 6 in the radial direction. The inner support shaft 2 is pressed and fixed on the tip side. Then, the cylindrical shaft 6 integrated with the support shaft 2 is passed through the fastening ring portions 51 of the four bolt mounting brackets 5 arranged on the left and right sides, and screw holes of the bolt mounting brackets 5 are passed. The cylindrical shaft 6 may be fixed to the bolt mounting bracket 5-by screwing and tightening the fastening bolt 55 to 53.

  Here, the support shaft 2 is attached so that the grounding brush 3 is pressed against the ground G by the elastic restoring force of the support shaft 2 when the work vehicle 1 is positioned on the flat ground G as shown in FIG. . That is, when the support shaft 2 is made of a spring steel material and the support shaft 2 is attached to the square bar lever 14 on the vehicle body 10 side, the bent portions 21 to 23 are bent in a natural state (no load state). ) Is set to be stronger than

  For example, as shown in FIG. 8, the setting degree of the elastic restoring force of the support shaft 2 is still inclined when the vehicle body 10 of the work vehicle 1 gets over the uphill of about 30 ° and reaches the flat surface. What is necessary is just to adjust so that the grounding brush 3 of the rear part which is not taking off the surface can fully slide on the ground. For example, as shown in FIG. 9, the support shaft 2 is supported in a downhill with an inclination of about 30 ° in a state where the work vehicle 1 has descended to reach a flat surface and the ground brush 3 is still in contact with the inclined surface. What is necessary is just to set the thickness and the bending degree of the bending parts 21-23 so that the bending of the shaft 2 may be settled in the range of elastic restoring property.

  The grass sand rubbing apparatus having the above structure is used for rubbing the sand previously sprayed between turf grass in a golf course green or the like. The rubbing operation of the mesh sand is automatically performed by the sliding contact of the grounding brush 3 with the ground when the work vehicle 1 travels, but even if there is a large or small undulation in the lawn like the golf course green, Since the ground brush 3 is always pressed against the ground by the spring force of the support shaft 2, it does not jump up. Even if the grounding position of the grounding brush 3 and the position of the work vehicle 1 are different from each other in the horizontal inclination of the ground, the grounding brush 3 follows the inclination of the ground independently of the work vehicle 1 in the horizontal direction. Can tilt. Therefore, according to this mesh sand rubbing apparatus, uniform mesh sand rubbing can be performed on the entire undulating lawn.

  Therefore, when the work vehicle 1 is run without performing the dust sand rubbing operation, the air cylinder 15 may be extended as shown in FIG. That is, the levers 13 and 14 are tilted so as to lift the rear end side by the extension operation, and the dust tank 11 is lifted obliquely upward while maintaining a fixed posture, but at the same time, the support shaft 2 fixed to the square bar lever 14 is supported. , The grounding brush 3 is lifted away from the ground G.

  In this lawn sand rubbing device, the spring force that presses the grounding brush 3 against the ground is brought about by the elastic restoring force of the left and right support shafts 2 themselves made of spring steel, and it is necessary to use a separate spring member. Therefore, the mounting structure of the grounding brush 3 is very simple, and the cost for assembling and manufacturing the mesh sand rubbing mechanism can be reduced accordingly.

  In the above embodiment, a green cleaning vehicle is used as the work vehicle 1, but as a working vehicle of the lawn sand dust rubbing device of the present invention, a green sand cleaning vehicle, a lawn mower, a drug spraying vehicle, etc. Various specifications other than cars can be used. Thus, like the support shaft 2 of the embodiment, the front end 2a is held on the work vehicle 1 side, and the ground brush 3 is supported by the rear end 2b extending rearward of the work vehicle 1. For example, it is possible to easily assemble the mesh sand rubbing mechanism for various work vehicles used for lawn maintenance including existing vehicles in a form that does not hinder the maintenance work. Since the work vehicle 1 can be used for a plurality of lawn maintenance work including rubbing sand, the management cost of the lawn can be greatly reduced.

  In the above embodiment, since the support shaft 2 is attached to the work vehicle 1 side via the fastening device 4 without performing processing such as drilling or welding, the attachment work is easy. In addition, when the work vehicle 1 is used for work other than the gravel rubbing, the gravel rubbing mechanism can be easily removed and the appearance of the work vehicle 1 in the removed state is not impaired. There are also advantages. In addition, since the support shaft 2 can be attached to and detached from the fastener 4, replacement when the support shaft 2 is damaged is easy. Furthermore, in the embodiment, since the grounding brush 3 is attached to the support shaft 2 via the mounting bracket 5, replacement when the grounding brush 3 is damaged or reaches the end of its life is easy.

  On the other hand, the support shaft 2 can be set in various shapes such as a linear shape or a square shape, but if the intermediate portion is formed in a zigzag shape in a side view as shown in the embodiment, the grounding brush There is an advantage that a sufficient spring strength for securing sufficient support strength to the surface 3 and pressing the grounding brush 3 against the ground can be expressed. Further, in the configuration in which the grounding brush 3 is switched between the grounded state and the non-grounded state by the vertical tilt of the support shaft 2 as in the embodiment, switching between the start and stop of the rubbing operation without removing the grounding brush 3 is performed. There is an advantage that can be performed.

  Further, when the work vehicle 1 is moved in a state where the grounding brush 3 is lifted by the vertical tilting means such as the air cylinder 15, an appropriate holding mechanism is used to prevent or suppress the grounding brush 3 from swinging. A suspension mechanism or the like may be attached to the work vehicle 1. In addition, in the present invention, the detailed structure such as the mounting structure of the support shaft 2 to the vehicle body side, the operation mechanism of the vertical tilting means of the support shaft 2, the mounting structure of the grounding brush 3 to the support shaft 2, the form of the grounding brush 3, etc. Various design changes can be made in addition to the embodiment.

DESCRIPTION OF SYMBOLS 1 Work vehicle 2 Support shaft 2a Front end part 2b Rear end part 21-23 Bending part 3 Grounding brush G Ground

Claims (4)

At the rear of the work vehicle, it has a horizontally long grounding brush attached via a pair of left and right support shafts made of spring steel,
Lawn sand rubbing device, wherein the grounding brush is configured to be pressed against the ground by spring elasticity of both support shafts.   The lawn sand rubbing apparatus according to claim 1, wherein the support shaft is held on the work vehicle side at a front end portion thereof and supports the ground brush at a rear end portion extending rearward of the work vehicle. .   The grass sand rubbing device according to claim 1 or 2, wherein an intermediate portion of the support shaft is bent in a plurality of stages having a zigzag shape in a side view.   The grass for sand lawn according to any one of claims 1 to 3, further comprising means for vertically tilting the support shaft, wherein the ground brush is converted into a grounded state and a non-grounded state lifted upward by the vertical tilt of the support shaft. Rubbing device.

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