JPH0328764Y2 - - Google Patents

Description

[Detailed explanation of the idea]

(Field of Industrial Application) This invention relates to a lawn protection device that protects lawns of golf courses, gardens, etc., particularly the green lawns of golf courses, from freezing, frost, and the like. (Prior Art) For example, at golf courses in cold regions, nighttime management of green lawns in winter is generally done by:
This is done by spreading sheet-shaped protective pine over the lawn, which protects the lawn from freezing, frost, and
It was intended to protect it from frost and other debris. (Problems to be Solved by the Invention) However, in this conventional technique, it is necessary to use a fairly thick sheet-like protective pine in order to provide sufficient protection for the lawn.
As its weight increases (more than 200g/ ^m2 ), its folded bulk also increases;
A significant number of man-hours are required to spread the protective pine on the lawn and fold it; for example, at a nine-hole golf course,
There is a problem that each of these tasks takes about 1 to 1.5 hours by 6 workers.
On the other hand, due to the long time it takes to fold the protective pine, it is necessary to delay the start time in winter by about 30 minutes, resulting in a reduction in revenue of about 40 people per day for green fees. There was a problem. Furthermore, since conventional protection pine is spread out almost tightly on the lawn, there is hardly any air layer between the protection pine and the lawn surface, and there is no inflow of air onto the lawn surface. In addition, the heat retention effect is poor, and the lawn surface becomes deficient in oxygen, resulting in severe withering and damage to the lawn, which requires a great deal of labor and expense to repair. The purpose of this invention is to advantageously solve the problems of the prior art, and to protect the lawn effectively, as well as to prevent the expansion and folding.
The present invention provides a lawn protection device that can be performed extremely quickly and by a small number of workers. (Means for Solving the Problems) The air mat of the lawn protection device of this invention is lightweight and has excellent water resistance, weather resistance, and abrasion resistance, and is mainly made of synthetic fabric made of synthetic fiber materials. It has a highly airtight double membrane structure consisting of upper and lower double membrane bodies that constitute the member and backing member, respectively. Furthermore, this air mat has a structure in which the double membrane structure is provided with a plurality of air supply spaces that are fully or partially connected to each other and capable of forming an air layer, and can be spread over a lawn surface.
Furthermore, a plurality of ventilation holes are provided that pass through the double membrane between these air supply spaces. This lawn protection device extends the air mat over the lawn, connects it to a blower via a duct, connects the blower to a power source, and further includes a fixing means for positioning the air mat in a predetermined position. At the same time, we will also install a storage box to store the folded air mat. (Function) According to this device, when air is supplied into the air mat, an air layer is enclosed within the air mat, and due to this air layer, a void is formed between the lower membrane of the air mat and the lawn surface. And this sky
A new air layer is formed, and when a vent is provided, this empty air layer is communicated with outside air through the vent, and air is exchanged by convection.
Therefore, both of these air layers exert a protective effect, and the empty air layer prevents oxygen deficiency on the lawn surface, and if the grass has ventilation holes, the empty air layer can be exchanged through the ventilation holes. This makes it possible to more effectively prevent oxygen deficiency. Moreover, because of this structure, the thickness and weight of the air mat itself can be made sufficiently small, and the number of man-hours required for expanding and folding the air mat can be significantly reduced. By the way, in a nine-hole golf course, the work of expanding and folding the greens can be completed in about 45 minutes by two workers each. Therefore, with this device, there is no need to delay the start time even in winter. (Example) This invention will be explained below based on illustrated examples.
Fig. 1 is a schematic plan view showing an embodiment of this invention, in which 1 indicates each air mat stretched out on the lawn at three green positions on a golf course, and 2 indicates connection to each air mat 1. Each blower is shown below. Here, each blower 2 is connected to a respective air mat 1 via an air duct 3, while preferably connected to one generator, for example an engine 4, capable of automatic operation for a predetermined period of time under the action of a timer. electrically connected to. Further, numeral 5 in the figure indicates a storage box for the air mat 1 installed at an inconspicuous location near the green. As shown in FIGS. 2 and 3 in an enlarged plan view and an enlarged cross section, the air mat of this device has upper and lower double membrane bodies 1a and 1b (forming a front member and a back member, respectively), for example, a synthetic material. Membranes made of woven fiber fabric and having excellent weather resistance and abrasion resistance are placed at predetermined intervals in the vertical or horizontal direction as shown in Figure 2, and are spaced approximately 1 m apart in the vertical direction in the figure. By stitching in a straight line, a plurality of air supply spaces 1c are formed between the two membrane bodies, and fasteners 1d for quick air removal are provided at multiple locations near the periphery of the space, and one of the The air duct 3 can be connected to the air supply space 1c. These plurality of air supply spaces 1c can be made to communicate with each other in whole or in part depending on the design, and an air layer can be formed by supplying air to these spaces 1c. Furthermore, as shown in FIG. 4, a plurality of ventilation holes 1e are provided that penetrate through the upper and lower double membrane bodies 1a and 1b between the plurality of air supply spaces 1c. A plurality of these ventilation holes 1e can be preferably formed by fixing eyelets to each seam portion of the upper and lower membrane bodies 1a and 1b adjacent to the air supply space 1c. With this configuration, as shown in FIGS. 3 and 4, when air is supplied to each air supply space 1c and an air layer is formed, this space 1c expands and the lower membrane body 1b becomes a lawn. The ventilation hole 1e portion between the adjacent air supply spaces 1c is raised above the lawn surface, and an air space 1f is formed between the lower membrane body 1b and the lawn surface. A new air layer is formed. These air layers in the sky 1f have the effect of retaining the heat radiated from the geothermal heat, and together with the air layer in the air supply space 1c, prevent the temperature drop on the lawn surface and prevent freezing, dew condensation, etc. on the lawn 6. I can do it. Furthermore, since an appropriate amount of outside air is exchanged with the air layer of the sky 1f through the ventilation hole 1e, the lawn does not become deficient in oxygen, and the lawn can be prevented from withering and damage. Here, both end portions of the upper membrane body 1a, the second
In the figure, if both end portions in the vertical direction, which are indicated by diagonal lines, are colored in rows with different colors, there is an advantage that the predetermined direction of expansion can be extremely easily confirmed when the air mat 1 is expanded. Further, here, a plurality of short ropes 7 fixed to the edge of the air mat 1 and a fixing stake 8 attached to the tip of each rope 7 are used to fix the air mat 1 in a stretched state to a predetermined position. constitute means. Here, this fixing means can perform its function by inserting the fixing pile 8 into the ground, as shown in FIG. The device configured in this way is configured such that, for example, the air mat 1 taken out from the storage box 5 is properly spread out on a green lawn using the color applied to the end portion as a guide, and then the fixed stake 8 is inserted into the ground. plug it in, then start the engine 4 at the required time,
The air mat 1 is put into use by supplying air into the air supply space of the air mat 1 using the blower 2. Here, the air continuously supplied from the blower 2 into the air supply space expands all the air supply spaces 1c as shown in FIGS. 3 and 4, thereby substantially covering the heat insulating layer. At the same time, a predetermined rigidity is imparted to the air mat 1. Note that the amount of air supplied from the blower 2 here is as follows after the air mat 1 is completely inflated.
Under the influence of the damper and/or natural leakage from the weave, the air mat internal swell is kept constant thereafter. Since the air mat 1 expanded in this manner acts as a heat insulating coating layer for the lawn 6, the lawn 6 can be sufficiently and effectively protected from freezing, frost, and the like. In addition, the air mat 1 here is lightweight in itself.

[Table] As can be understood from this result, the grass did not freeze because the temperature inside the air did not drop to the freezing temperature. Note that with conventional protective mats, it was not possible to measure the temperature because there was no space, so we conducted a freezing survey. (Effects of the invention) As is clear from the above, this device is particularly effective for the air layer supplied into the air mat 1 and the empty air layer between the lawn surface and the lower membrane body. Therefore, the lawn 6 can be sufficiently protected from freezing, dew condensation, oxygen deficiency, etc. Furthermore, the thickness and weight of the air mat itself can be significantly reduced compared to conventional composite fabrics. Therefore, operations such as expanding and folding can be performed extremely quickly without damaging the lawn 6. According to the test results, an air mat that can adequately protect the lawn has a weight of approximately 25 kg per 100 m ² , so two workers are required to perform each of the tasks of expanding and folding the air mat. It was possible to do this in about 5 minutes. Therefore, when this device is applied to the greens of a golf course, great benefits such as an increase in green fees due to earlier start times, shorter working hours, and reductions in labor costs will be brought about.

[Brief explanation of drawings]

Figure 1 is a plan view showing an embodiment of this invention, Figure 2 is a plan view showing an embodiment of this invention.
The figure is an enlarged plan view showing the air mat, Figure 3 is a sectional view taken along the - line in Figure 2, and Figure 4 is an enlarged sectional view mainly showing the air layer between the double membranes, the empty air layer, and the ventilation holes. It is. 1...Air mat, 1a, 1b...Membrane body, 1
c...Air supply space, 1d...Fusuna, 1
e...Vent, 1f...Empty, 2...Blower, 3
... Air duct, 4 ... Engine, 5 ... Storage box, 6 ... Lawn, 7 ... Short rope, 8 ... Fixed stake.

Claims (1)

[Scope of claim for utility model registration] A collapsible air mat that has multiple air supply spaces between upper and lower double membrane bodies and is stretched out on a lawn, and a fixing device that positions the stretched air mat in a predetermined position. a blower connected to the air mat for supplying air to the air mat; a power source for operating the blower; and a storage box for storing the folded air mat, and a double membrane body arranged above and below between the air supply spaces. A lawn protection device comprising: a plurality of ventilation holes passing through the lawn protection device.