WO2009082165A2

WO2009082165A2 - Small multipurpose a watering cart

Info

Publication number: WO2009082165A2
Application number: PCT/KR2008/007644
Authority: WO
Inventors: Sung Wang Ro
Original assignee: Jinmyung21 Co., Ltd.
Priority date: 2007-12-26
Filing date: 2008-12-24
Publication date: 2009-07-02
Also published as: WO2009082165A3

Abstract

The present invention provides a small multipurpose watering cart. The watering cart includes a first engine (100), a pump (200) which is operated by the first engine, and a support plate unit (300) which supports the first engine and the pump thereon. The watering cart further includes a second engine (400) which operates wheels (500), and a gearbox (600) which is operated by power transmitted from the second engine. The wheels (500) are connected to the gearbox. The watering cart further includes a brake unit (700) which controls rotation of the wheels, a clutch unit (800) which is provided between the second engine (400) and the gearbox (600) to control power transmission therebetween, a flexible hose (900) which is connected to an outlet of the pump, and a frame unit (1000) which rotatably supports the wheels and a handle (1300) for steering.

Description

Description SMALL MULTIPURPOSE A WATERING CART

Technical Field

[1] The present invention relates, in general, to small multipurpose watering carts and, more particularly, to a small multipurpose watering cart in which wheels are rotated by the operation of a separate engine, so that the small multipurpose watering cart can be easily moved even to a fire spot that does not allow access of a vehicle because of a poor access route, and steering and braking operations can be easily implemented only by manipulating a handle, and which can be directly connected to an outdoor hydrant, thus smoothly discharging water, for example, to extinguish a fire.

[2]

Background Art

[3] Generally, when a fire occurs, it is very important to rapidly cope with the fire and try to extinguish it early so as to reduce damage. Particularly, in the case of areas, such as a mountain, an open-air yard, etc., in which if a fire occurs, tremendous damage is anticipated, the importance of correct initial extinguishment is further emphasized. However, in the areas, such as a mountain, an open-air yard, etc., it is difficult to initially fight a fire, because it is not typically equipped with a fire protection system. Furthermore, even if a fire is detected early, there are frequent cases where initial extinguishment is impossible because of insufficiency or underdevelopment of a fire protection apparatus.

[4] In particular, in the case of a forest fire which occurs in the dry season, lots of people must be mobilized. To fight a forest fire, various systems for extinguishment are put into operation. However, as fire extinguishment apparatuses or methods, basic apparatuses and methods have been used, for example, covering fire with soil using a shovel or rake. In addition, at most manual spray fire extinguishers have been used to finish the fire. Therefore, extinguishment of the forest fire cannot be effectively implemented.

[5] In the same manner, in the case of a fire which occurs in an open-air yard, a narrow street, a traditional market, etc. where water is insufficient, there is a difficulty in initial extinguishment, because it is difficult for a fire truck to access thereto, despite the initial extinguishment being most important.

[6] Meanwhile, in the case of a conventional watering cart, it cannot be directly connected to an OC valve on an area, such as a park. Therefore, to supply water to grass, trees, etc., a pump and a separate vehicle having a water tank are required.

[7] Disclosure of Invention

Technical Problem

[8] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a small multipurpose watering cart in which wheels are rotated by the operation of a separate engine, so that the small multipurpose watering cart can be easily moved even to a fire spot that does not allow access of a vehicle because of a poor access route, and which can be easily controlled only by manipulating a handle, and can be directly connected to an outdoor hydrant, thus rapidly and easily discharging water, for example, to extinguish a fire, and which can be directly connected to an OC valve provided in an area, such as a park, so that it can be used to sprinkle grass or other plants, and which can directly suction water and thus easily feed water to a rice paddy or farm.

[9]

Technical Solution

[10] In order to accomplish the above object, the present invention provides a small multipurpose watering cart, including: a first engine to generate power to operate a pump, the first engine being integrally provided with a fuel tank; the pump coupled to and operated by the first engine; a support plate unit supporting the first engine and the pump thereon; a second engine to operate wheels; a gearbox to be operated by power transmitted from the second engine; the wheels connected to the gearbox; a brake unit to control rotation of the wheels; a clutch unit provided between the second engine and the gearbox to control power transmission therebetween; a flexible hose connected to an outlet of the pump to discharge fluid, the flexible hose being changed in direction to aim at a fire spot; and a frame unit to which the wheels are rotatably mounted, the frame unit having a handle support(1200) and a handle(1300) for steering.

[11] The small multipurpose watering cart may further include an upset prevention member provided on the support plate unit to prevent the watering cart from falling over when the pump is operated. Furthermore, the small multipurpose watering cart may further include a temporary brake locking unit to temporarily hold the brake unit which is in an operated state.

[12] In addition, the small multipurpose watering cart may further include a riding support provided on the frame unit to allow a user to ride thereon. The riding support may be rotatable using a hinge.

[13] The small multipurpose watering cart may further include an rpm control unit mounted to the handle provided with the brake unit and the clutch unit. The rpm control unit may control an rpm of the first engine. As well, the small multipurpose watering cart may further include a hand clutch unit to control a tension of a pulley belt between the first engine and the pump, thus controlling power transmitted from the first engine to the pump. [14]

Advantageous Effects

[15] In a small multipurpose watering cart according to the present invention, because wheels are rotated by the operation of a separate engine, the watering cart can be easily moved even to a fire spot that does not allow access of a vehicle because of a poor access route, for example, to a forest, an open-air yard, a narrow street, a traditional market, etc. Furthermore, the watering cart can be directly connected to an outdoor hydrant, thus rapidly and easily discharging water, for example, to extinguish a fire. In addition, the watering cart can be directly connected to an OC valve provided in an area, such as a park, so that it can be used to sprinkle water onto grass or other plants. As well, the watering cart can directly suction water and thus easily feed water to plants or use it for fire extinguishment.

[16]

Brief Description of Drawings

[17] Fig. 1 is a perspective view illustrating a small multipurpose watering cart, according to the present invention;

[18] Fig. 2 is a perspective view showing the construction of a frame unit from which a pump and a support plate unit that are critical parts of the present invention are removed;

[19] Fig. 3 is a perspective view showing the construction of a first engine which is a critical part of the present invention;

[20] Fig. 4 is an exploded perspective view showing the construction of the pump which is a critical part of the present invention;

[21] Fig. 5 is a side sectional view showing the construction of the pump which is a critical part of the present invention;

[22] Fig. 6 is a sectional view showing the construction of the pump which is a critical part of the present invention;

[23] Fig. 7 is a perspective view showing the construction of a main rotor and an auxiliary rotor which are critical parts of the present invention;

[24] Fig. 8 is an assembled sectional view showing the coupling structure between the rotors shown in Fig. 7;

[25] Fig. 9 is a sectional view showing installation of a sealing unit which is a critical part of the present invention;

[26] Fig. 10 is a perspective view showing the structure of an oil pumping member which is a critical part of the present invention; [27] Fig. 11 is a view showing the operation of the oil pumping member which is a critical part of the present invention; [28] Fig. 12 is a perspective view showing the construction of a clutch unit which controls the tension of a pulley belt connecting a gearbox to a second engine so as to control power transmission therebetween; [29] Fig. 13 is a perspective view showing the construction of a hand clutch unit which controls the tension of a pulley belt connecting the pump to the first engine so as to control power transmission therebetween; [30] Fig. 14 is a view showing the operation of an upset prevention unit for preventing the support plate unit from falling over due to a load of water which is discharged by the operation of the pump; [31] Fig. 15 is a view showing the support plate unit opened to allow maintenance of the second engine and the gearbox;

[32] Fig. 16 is a perspective view showing the installation structure of a brake unit; and

[33] Fig. 17 is a view illustrating another embodiment of the present invention.

[34]

[35] *Description of the elements in the drawings*

[36] 1: small multipurpose watering cart 100: first engine

[37] 200: pump 300: support plate unit

[38] 300a: upset prevention unit 400: second engine

[39] 500: wheels 600: gearbox

[40] 700: brake unit 800: clutch unit

[41] 900: flexible hose 1000: frame unit

[42] 1300: handle 1400: rpm control knob

[43] 2000: hand clutch unit

[44]

Best Mode for Carrying out the Invention [45] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the attached drawings. [46] Fig. 1 is a perspective view illustrating a small multipurpose watering cart, according to the present invention. Fig. 2 is a perspective view showing the construction of a frame unit from which a pump and a support plate unit that are critical parts of the present invention are removed. Fig. 3 is a perspective view showing the construction of a first engine which is a critical part of the present invention. Referring to the drawings, the small multipurpose watering cart 1 according to the present invention includes the first engine(lOO) which generates power to operate the pump and is integrally provided with a fuel tank, and the pump (200) which is coupled to the first engine (100). The small multipurpose watering cart(l) further includes the support plate unit(300) which supports the first engine(lOO) and the pump(200) thereon, a second engine(400) which operates wheels(500), and a gearbox(600) which is operated by power transmitted from the second engine (400). The small multipurpose watering cart(l) further includes the wheels (500) which are connected to the gearbox(600), a brake unit(700) which controls rotation of the wheels(500), a clutch unit(800) which is installed between the second engine(400) and the gearbox(600) to control power transmission therebetween, and a flexible hose(900) which is connected to an outlet of the pump(200) and discharges fluid. The flexible hose(900) can easily change direction when being aimed at a fire spot. The small multipurpose watering cart(l) further includes the frame unit(lOOO), to which the wheels (500) are rotatably mounted, and which includes a handle support (1200) and a handle(1300) for steering.

[47] The first engine(lOO) integrally includes the fuel storage tank(l 10) and an engine part(120) which generates power to operate the pump. The engine part(120) is provided with an rpm control lever(130) which is connected to an rpm control knob(1400) provided on the handle(1300) that supports brake levers of the brake unit(700) and a speed control lever of the clutch unit(800) thereon. The rpm of the first engine (100) can be controlled by manipulating the rpm control knob (1400).

[48] As shown in Fig. 15, it is preferable that the support plate unit(300) be rotatable using a hinge in order to facilitate repair or replacement of the second engine(400) and the gearbox(600).

[49] As shown in FIGS. 1 and 16, the brake levers of the brake unit(700) are provided on both ends of the handle(1300) and are connected to respective brake drums(710) by wires. The brake drums (710) serve to stop the wheels.

[50] Fig. 4 is an exploded perspective view showing the construction of the pump which is a critical part of the present invention. Fig. 5 is a sectional view showing the construction of the pump according to the present invention. Referring to the drawings, the pump (200) includes a first cover (10) which has an inlet(12) through which fluid is supplied into the pump (200), and an auxiliary cover(lθa) which moves the supplied fluid into a space in which rotors are installed. The pump(200) further includes a main pump body(30) in which the supplied fluid is compressed at a predetermined pressure, and a second cover(40) which temporarily stores the fluid supplied from the auxiliary cover(lθa). The pump(200) further includes a power transmission unit(50) which transmits rotating force to rotating shafts and the rotors, and a rotor assembly(60) which has a main rotor(61) and auxiliary rotors (62) which compress the supplied fluid at a predetermined pressure. The pump(200) further includes a sealing unit(70) which returns lubricant flowing on the rotating shafts to prevent adherence and leakage of the lubricant, and an oil pumping member(80) which forcibly circulates lubricant around bearings for supporting the rotating shafts which rotate at high speed.

[51] With regard to the structure of the first cover(lθ), coupling holes are formed through the first cover(lθ). An inflow space(l 1) is defined in the first cover(lθ), and the inlet(12) is formed through the central portion of the first cover(lθ). The auxiliary cover(lθa) has a coupling part which is coupled to the first cover(lθ) through the coupling holes of the first cover (10) using pins or bolts. Furthermore, branch inlet paths (1 Ia) and (1 Ia') are respectively formed at upper and lower positions in the auxiliary cover (10a). An opening(12a), into which ends of the rotating shafts(53) are inserted, is formed in a partition wall provided in the auxiliary cover(lθa).

[52] The main pump body(30) has a rotor seating depression(31) in which the main rotor(61) and the auxiliary rotors (62) are installed. Branch inlet depressions (32) and (32a) and branch outlet depressions(33) and (33a) are formed in the main pump body(30) on opposite sides the upper and lower ends of the rotor seating depression(31). An O-ring insert groove is formed around the rotor seating depression(31). The branch inlet depressions (32) and (32a) communicate with the branch inlet paths (1 Ia) and (1 Ia'). The branch outlet depressions(33) and (33a) communicate with the rotor seating depression(31) and the outlet (34).

[53] The second cover(40) has shaft holes(41) into which the respective rotating shafts(53) are inserted. A bearing(42) is installed in each shaft hole(41). A space(43), in which the power transmission unit(50) is installed, is defined in the second cover(40).

[54] As shown in Fig. 6, the rotor assembly(60) includes the main rotor(61) and the auxiliary rotors (62). Each of the main rotor(61) and the auxiliary rotors (62) has a rotor body(61a, 62a) which is fitted over the corresponding rotating shaft(53) which rotates in the main pump body(30), protrusions(61b, 62b) which are provided on the circumferential outer surface of the rotor body(61a, 62a) and are coated with elastic members. Depressions(61c, 62c) are formed between the protrusions (6 Ib, 62b). Leakage prevention tips(61d, 62d) are provided on each protrusion(61b, 62b) at positions spaced apart from each other at regular intervals.

[55] As shown in Figs. 4 and 5, the power transmission unit(50) functions to transmit power to the rotating shafts(53) to which the main rotor(61) and the auxiliary rotors(62) are fastened. The power transmission unit(50) includes a first gear(51) which is fitted over a main drive shaft(M), and a second gear(52) which engages with the first gear(51) and is coupled to the rotating shafts(53).

[56] As shown in Fig. 9, the sealing unit(70) is constructed such that a sealing member(70a), a sealing packing(70b) and base plate(70c) are sequentially coupled to each other. The sealing member(70a) is provided between the main drive shaft(M) and the main pump body(30), through which the rotating shafts(53) are provided. In the sealing member(70a), a metal support(71) is embedded in a rubber rib(72). The rubber rib(72) has a flexible part(72-l) which has a cylindrical shape. The sealing packing(70b) is in contact with the sealing member(70a) and discharges oil outside. The base plate(70c) supports the sealing member(70a) and the sealing packing(70b) and is made of metal. The base plate(70c) has therein through holes, into which the respective rotating shafts(53) are inserted.

[57] As shown in Fig. 10, the oil pumping member(80) includes a member body (81) and blade parts(83) which are configured such that it surrounds the junction between the gears(51) and (52) that are provided on the rotating shafts(53) of the main rotor(61) and the auxiliary rotors(62) to transmit power. Furthermore, a coupling hole is formed in the member body(81) so that it is mounted to the main pump body(30). A fluid guide depression(82) is formed in the lower surface of the member body(81). The blade parts(83) are provided on the respective opposite ends of the member body(81). A fluid discharge hole(85) is formed in one blade part(83) at a position aligned with the center of the fluid guide depression(82). Rectangular guide recesses(84) are formed in the inner surfaces of the respective blade parts(83). One end of each guide recess(84) is connected to the fluid guide depression(82).

[58] With regard to the structure of the frame unit(lOOO), as shown in Fig. 2, the wheels(500) are rotatably mounted to the frame unit(lOOO). The handle support(1200) and the handle(1300) for steering are provided on the frame unit(lOOO). Furthermore, the handle(1300) is provided both with the brake levers of the brake unit(700) which control the rotation of the wheels (500), and with the speed control lever of the clutch unit(800) which controls the tension of the pulley belt connecting the gearbox(600) to the second engine (400) to control power transmission therebetween.

[59] Meanwhile, as shown in Fig. 14, an upset prevention unit(300a) is preferably mounted to the support plate unit(300) provided on the frame unit (1000), thus preventing the cart from falling over when the pump (200) is operated on the support plate unit(300).

[60] The upset prevention unit(300a) includes a guide holder(300a-l) which is integrally provided on the support plate unit(300). A through hole is formed through the center of the guide holder(300a-l), and a fastening hole is formed through the sidewall of the guide holder(300a-l). The upset prevention unit(300a) further includes a support rod(300a-2) which passes through the through hole of the guide holder(300a-l) and is fastened thereto by a fastening member(300a-3) tightened into the fastening hole of the guide holder(300a-l).

[61] The wheels(500) include drive wheels(510) which are coupled to respective ends of a wheel shaft such that they are rotated by the operation of the gearbox(600), and an auxiliary wheel(520) which is provided under the frame unit(lOOO) so as to be independently rotatable without being connected to the gearbox(600). The auxiliary wheel(520) which follows the drive wheels (510) serves to support the weight of the rear portion of the watering cart which includes the handle (1300).

[62] With regard to the structure of the clutch unit(800), as shown in Fig. (12), when a user rotates the speed control lever(800-l) which is provided on the handle(1300), a wire(800-2) which is connected to the speed control lever (800-1) is pulled, thus rotating a rod(800-3). Then, a compression roller (800-4) provided on the rod(800-3) presses the belt which is wrapped between pulleys, so that the tension of the belt is increased. Hence, efficiency of power transmission from the second engine(400) to the gearbox(600) is increased, thus increasing the rotating speed of the wheels(500). Conversely, when the speed control lever(800-l) rotates towards its original position, the compression roller(800-4) releases the belt, so that the belt is loosened. Thereby, the efficiency of power transmission between the second engine(400) and the gearbox(600) is reduced, so that the rotating speed of the wheels (500) is reduced.

[63] Meanwhile, as shown in Fig. 13, a hand clutch unit(2000) is provided at a predetermined position on the support plate unit(300). The hand clutch unit(2000) adjusts tension of a pulley belt connected between the first engine(lOO) and the pump(200) to control power transmission therebetween, thus controlling a flow rate of fluid discharged from the pump. The handle clutch unit(2000) is constructed such that when the user pulls a hand lever (2000-1), a connection bar(2000-2) connected to the hand lever(2000-l) is pulled, thus rotating a rod(2000-3). Then, a force with which a compression roller(2000-4) provided on the end of the rod(2000-3) presses the belt wrapped between pulleys is adjusted. Thereby, the efficiency of power transmission from the first engine(lOO) to the pump(200) is controlled depending on the tension of the belt, thus controlling the pumping efficiency of the pump (200).

[64] The structure of the hand clutch unit(2000) is very similar to that of the clutch unit(800), and there is only a difference in the fact that the hand clutch unit(200) operates the hand lever(200-l) but the clutch unit(200) operates the speed control lever(800-l).

[65] The operation of the small multipurpose watering cart according to the present invention having the above-mentioned construction will be described. The watering cart of the present invention can be moved using the rotation of the wheels(500) provided under the frame unit(lOO) by holding the handle and pulling or pushing it without operating the second engine(400) to rotate the wheels (500). Thanks to the manual movement, the watering cart can moves to a fire spot, an access passage of which is poor, for example, a forest, an open-air yard, a narrow street, a traditional market, etc. [66] The small multipurpose watering cart of the present invention can be moved not only by the above-mentioned manual moving method without operating the engine but also by an automatic moving method. To move the watering cart using the automatic moving method, fuel is charged into a fuel tank (not shown), and the second engine(400) is operated. Then, the gearbox(600) which is connected to the second engine (400) by the belt is operated.

[67] In this state, as shown in Fig. 12, when the user rotates the speed control lever(800-l) provided on the handle(1300), the wire(800-2) connected to the speed control lever(800-l) is pulled, thus rotating the rod(800-3). Then, the compression roller(800-4) provided on the end of the rod(800-3) presses the belt wrapped between the pulleys. Thereby, the tension of the belt is increased, so that efficiency of transmitting power from the second engine(400) to the gearbox(600) is increased. As a result, the rotating speed of the wheels(500) is increased. Conversely, in the case where the user rotates the speed control lever(800-l) towards its original position, force with which the compression roller(800-4) presses the belt is reduced, so that the tension of the belt is reduced. Then, efficiency of transmitting power from the second engine(400) to the gearbox(600) is reduced. Thereby, the rotating speed of the wheels(500) is reduced. As such, using the wheels (500) being rotated by the power of the second engine(400), the watering cart of the present invention can rapidly move to a fire spot, an access passage of which is poor, for example, a forest, an open-air yard, a narrow street, a traditional market, etc.

[68] After the small multipurpose watering cart 1 of the present invention is moved to the desired spot, the user starts the first engine(lOO). Then, fuel is supplied from the fuel storage tank(l 10) to the engine part(120), and the first engine(lOO) is thus operated. Hence, the pump(200) is operated by the operation of the first engine(lOO). Thereby, water is discharged outside through the flexible hose(900). Here, the rpm of the first engine (100) can be controlled by the rpm control knob (1400). The rpm control knob(1400) is connected to the rpm control lever(130) provided in the engine part(120), such that the user controls the rpm of the first engine(lOO).

[69] With regard to the operation of the pump(200), the main drive shaft(M )is rotated by the operation of the first engine(lOO), and the first gear(51 )and the second gears(52) are simultaneously rotated by the rotation of the main drive shaft(M). Thereby, the rotating shafts (53) are simultaneously rotated.

[70] At this time, in the case where fluid is supplied into the pump(200 )through the inlet(12) formed in the first cover(lθ), fluid is charged into the inflow space defined in the first cover (10) and the auxiliary cover(lθa). The fluid flows along the branch inlet paths (1 Ia) and (1 Ia') formed in the auxiliary cover(lθa) and is thereafter supplied into the main pump body (30). [71] In detail, the fluid that has passed through the branch inlet paths(l Ia) and (1 Ia') is supplied into the rotor seating depression(31) of the main pump body(30). Then, the fluid is compressed by the main rotor(61) and the auxiliary rotors (62) at a predetermined pressure.

[72] When the main rotor(61) and the auxiliary rotors(62) rotate, fluid is compressed at the junction between the protrusions(βlb) of the main rotor(61) and the protrusions(62b) of the auxiliary rotors(62). The compression of fluid is conducted by repeating the operation in which while the protrusions (61b) of the main motor(61) and the corresponding protrusions (62b) of the auxiliary rotors (62) consecutively cross over each other, the protrusions(61b) and (62b) are inserted into and removed from the corresponding depressions (6 Ic) and (62c), and the subsequent protrusions(61b) and (62b) are inserted into and removed from the subsequent depressions (61c )and (62c).

[73] Due to the above-mentioned operation, the supplied fluid is moved to the branch outlet depressions(33) and (33a) from the depressions (6 Ic) of the main rotor(61). As a result, the fluid is forcibly moved from the branch inlet depressions (32) and (32a) into the branch outlet depressions(3)3 and 33a. This operation is repeatedly conducted, thus pumping fluid.

[74] Here, gaps are inevitably formed between main rotor (61) and the auxiliary rotors

(62), and between the auxiliary rotors (62) and the main pump body(30), and between the main rotor(61) and the main pump body (30). The gaps cause the backflow of fluid. In the present invention, to prevent reduction in pressure and flow rate attributable to the backflow, the leakage prevention tips(61d, 62d) which are made of elastic material are provided at predetermined positions on the outer surface of each rotor. In other words, the leakage prevention tips (6Id) and (62d) prevent occurrence of gap between the corresponding components while the pump is operated, thus enhancing the performance of the pump.

[75] As such, thanks to the reliable sealing structure, the performance of the volumetric rotary pump can be enhanced, and the lifetime thereof can be increased.

[76] In the main pump body(30), the branch inlet depressions(32) and (32a) through which fluid is supplied into the pump, and the branch outlet depressions(33) and (33a) through which fluid is discharged are formed on opposite sides of the auxiliary rotors (62). In addition, close contact parts are formed between the two auxiliary rotors (62), that is, between the inlet depression adjacent to one of the auxiliary rotors (62) and the outlet depression adjacent to a remaining one. Thus, the outermost portions of the main rotor(61) and the auxiliary rotors (62) are in contact with the main pump body, so that when the rotors are rotated, the watertightness between the components can be ensured.

[77] Furthermore, because the rotating shafts(53) rotate at high speed when fluid is pumped, lubricant may undesirably leak. In the present invention, this is prevented by the sealing unit(70). In the sealing unit (70), the base plate(70c) prevents the sealing member(70a) coupled to the main pump body from being undesirably separated from the sealing packing(70b) due to an increase in pressure of lubricant on the sealing member(70a).

[78] Meanwhile, with regard to the preservation of the bearings(42) which support the rotating shafts(53), when the gears(51) and (52) rotate, vacuum is created at positions at which gear teeth of the gears(51) and (52) which have engaged with each other are separated from each other. Due to this vacuum force, the fluid guide depression(82) of the member body(81) of the oil pumping member(80) can be filled with oil.

[79] The oil which is charged into the fluid guide depression(82) of the member body(81) is carried at a predetermined pressure to the fluid discharge hole(85) by the rotation of the gears(51) and (52). In other words, the oil charged into the fluid guide depression(82) is pushed by oil which is supplied into space between the outer circumferences of the gears(51) and (52) and the member body (81) by the engagement of the gears(51) and (52), thus being discharged to outside of the member body(81) through the fluid discharge hole(85).

[80] As such, when the gears(51) and (52) which are provided on the rotating shafts(53) of the main rotor(61) and the auxiliary rotors (62) to transmit power therebetween are rotated, oil is compressed between the gears (51) and (52) and discharged through the fluid discharge hole(85) at a predetermined pressure. The discharged oil flows along an oil passage and is supplied to the bearings, thus cooling and lubricating the bearings, thereby reliably preventing damage to the bearings.

[81] Furthermore, the rectangular guide recesses(84) are formed in the inner surfaces of the respective blade parts(83). One end of each guide recess(84) is connected to the fluid guide depression(82), so that when the gears(51) and (52) rotate, oil is moved to the guide recesses (84) by an increase in pressure. The oil moved to the guide recesses(84) are moved to the fluid guide depression(82) by oil which is continuously supplied into the guide recesses(84) by the rotation of the gears(51) and (52). The oil moved to the fluid guide depression(82) is discharged to outside of the oil pumping member (80) through the fluid discharge hole(85).

[82] Meanwhile, water discharged from the pump is jet to the outside through the flexible hose(900). Preferably, the flexible hose(900) is constructed such that the direction thereof can be easily changed to aim at a fire spot.

[83] In the present invention, the upset prevention unit(300a) can prevent the support plate unit(300) from falling over when water is discharged. That is, as shown in Fig. 14, the support rod(300a-2) which is provided through the through hole of the guide holder(300a-l) is moved downwards, the guide holder(300a-l) being integrally mounted to the support plate unit(300) and having the fastening holes in the sidewall thereof. Thereafter, the support rod(300a-2) is fastened to the guide holder(300a-l) by tightening the fastening member(300a-3) which is threaded into the fastening hole of the guide holder(300a-l). Then, the support plate unit(300) can be prevented from falling over due to a load of water when it is discharged.

[84] Meanwhile, the small multipurpose watering cart(l) according to the present invention further includes a riding support(l 100) which is rotatably mounted to the frame unit(lOOO). Therefore, when the watering cart(l) travels on an even road which is not steep using the second engine(400), the user can ride on the watering cart(l) in such a way as to unfold the riding support(l 100) from the frame unit(lOOO) and step onto the riding support (1100).

[85] The movement of the small multipurpose watering cart(l) can be temporarily stopped by using a temporary brake locking unit (not shown) which temporarily holds the brake unit(700). When the locking of the temporary brake locking unit is released, the small multipurpose watering cart(l) is moved again.

[86] With regard to the turning of the small multipurpose watering cart 1 of the present invention, if the user pulls both the two brake levers of the brake unit(700) which are provided on the handle(1300), the small multipurpose watering cart(l) is stopped. However, if the user pulls one of the two brake levers, only the corresponding drive wheel(510) is stopped, so that the small multipurpose watering cart(l) turns around the stopped drive wheel(510).

[87] In the wheels(500), the drive wheels(510) which are provided on the respective ends of the wheel shaft and are rotated by power transmitted from the gearbox(600) are a means for moving the small multipurpose watering cart 1 using the transmitted power. However, the auxiliary wheel(520) which follows the drive wheels (510) is only an auxiliary means for supporting the weight of the rear portion of the watering cart 1.

[88] In the present invention, because it is convenient to move the watering cart using the operation of the engine, the watering cart is very useful as a means for carrying the pump to a fire spot, which does not allow access of a vehicle thereto, for example, a forest, an open-air yard, a narrow street, a traditional market, etc. In addition, the watering cart may be directly connected to an OC valve provided in a park or the like such that it can be used to sprinkle grass or other plants or feed water to a rice paddy or farm.

[89] Furthermore, in the present invention, as shown in Fig. 15, the support plate unit can be rotated around the hinge pin, so that maintenance, repair or replacement of the second engine(400) or the gearbox(600) can be conveniently implemented.

[90] Meanwhile, as shown in Fig. 17, the watering cart may be constructed such that the power of the first engine(lOO) for operating the pump(200) is used to operate the wheels(500) without using the second engine(400) which has been illustrated as being used to operate the wheels (500). For this, the water cart includes, in place of the second engine(400), a power transmission device(600a) which transmits power from the first engine(lOO) to the gearbox (600).

[91] In the case where the power transmission device(600a) is used in place of the second engine(400), as shown in Fig. 17, the structure of the watering cart can be simplified, and the movement of the watering cart can be further facilitated thanks to a reduction in weight.

[92]

Claims

[1] A small multipurpose watering cart, comprising: a first engine (100) to generate power to operate a pump, the first engine (100) being integrally provided with a fuel tank; the pump (200) coupled to and operated by the first engine (100); a support plate unit (300) supporting the first engine (100) and the pump (200) thereon; a second engine (400) to operate wheels (500); a gearbox (600) to be operated by power transmitted from the second engine

(400); the wheels (500) connected to the gearbox (600); a brake unit (700) to control rotation of the wheels (500); a clutch unit (800) provided between the second engine (400) and the gearbox

(600) to control power transmission therebetween; a flexible hose (900) connected to an outlet of the pump (200) to discharge fluid, the flexible hose (900) being changed in direction to aim at a fire spot; and a frame unit (1000) to which the wheels (500) are rotatably mounted, the frame unit (1000) having a handle support 1200 and a handle 1300 for steering. [2] The small multipurpose watering cart according to claim 1, further comprising: an upset prevention member (300a) provided on the support plate unit (300) to prevent the watering cart from falling over when the pump (200) is operated. [3] The small multipurpose watering cart according to claim 1, further comprising: a temporary brake locking unit (710) to temporarily hold the brake unit (700) which is in an operated state. [4] The small multipurpose watering cart according to claim 1, further comprising: a riding support (1100) provided on the frame unit (1000) to allow a user to ride thereon. [5] The small multipurpose watering cart according to claim 4, wherein the riding support (1100) is rotatable using a hinge. [6] The small multipurpose watering cart according to claim 1, further comprising: an rpm control unit (130) mounted to the handle provided with the brake unit

(700) and the clutch unit (800), the rpm control unit (130) controlling an rpm of the first engine (100). [7] The small multipurpose watering cart according to claim 1, further comprising: a hand clutch unit (2000) to control a tension of a pulley belt between the first engine (100) and the pump (200), thus controlling power transmitted from the first engine to the pump. [8] The small multipurpose watering cart according to claim 1, wherein the support plate unit (300) is rotatable using a hinge.

[9] The small multipurpose watering cart according to claim 1, wherein the pump

(200) comprises: a first cover (10) having therein an inlet (12) for supply of fluid; an auxiliary cover (10a) to move the supplied fluid into a space in which rotors are installed; a main pump body (30), in which the supplied fluid is compressed at a predetermined pressure; a second cover (40) to temporarily store the fluid supplied from the auxiliary cover (10a); a power transmission unit (50) to transmit rotating force to rotating shafts and the rotors; a rotor assembly (60) having a main rotor (61) and auxiliary rotors (62) to compress the supplied fluid at the predetermined pressure; a sealing unit (70) to return lubricant flowing on the rotating shafts to prevent adherence and leakage of the lubricant; and an oil pumping member (80) to forcibly circulate the lubricant around bearings, the bearings supporting the rotating shafts which rotate at high speed.

[10] The small multipurpose watering cart according to claim 2, wherein the upset prevention unit (300a) comprises: a guide holder (30Oa-I) integrally provided on the support plate unit (300), the guide holder (30Oa-I) having a through hole along a center axis thereof, with a fastening hole formed through a sidewall of the guide holder (30Oa-I); a support rod (300a-2) provided through the through hole of the guide holder (30Oa-I) so as to be movable upwards or downwards; and a fastening member (300a-3) tightened into the fastening hole of the guide holder (30Oa-I) to fasten the support rod (300a-2) to the guide holder (30Oa-I).

[11] The small multipurpose watering cart according to claim 1, wherein the wheels

(500) comprise: drive wheels (510) coupled to respective ends of a wheel shaft and rotated by the operation of the gearbox (600); and an auxiliary wheel (520) provided under the frame unit (1000) so as to be independently rotatable without being connected to the gearbox (600), the auxiliary wheel (520) following the drive wheels (510) and supporting a weight of a rear portion of the watering cart.

[12] The small multipurpose watering cart according to claim 1, wherein the second engine (400) for operating the wheels (500) is a power transmission device transmitting power, output from the first engine (100) for operating the pump (200), to the gear box (600).