CA2650116C - Height-adjustable three-wheeled chair - Google Patents
Height-adjustable three-wheeled chair Download PDFInfo
- Publication number
- CA2650116C CA2650116C CA2650116A CA2650116A CA2650116C CA 2650116 C CA2650116 C CA 2650116C CA 2650116 A CA2650116 A CA 2650116A CA 2650116 A CA2650116 A CA 2650116A CA 2650116 C CA2650116 C CA 2650116C
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- Prior art keywords
- height
- frame
- main frame
- insertion rod
- adjustable
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Classifications
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C9/00—Stools for specified purposes
- A47C9/02—Office stools not provided for in main groups A47C1/00, A47C3/00 or A47C7/00; Workshop stools
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
- A01B75/00—Carriers for supporting persons when working in the field, e.g. while thinning beet
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01D—HARVESTING; MOWING
- A01D93/00—Harvesting apparatus not provided for in other groups of this subclass
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C3/00—Chairs characterised by structural features; Chairs or stools with rotatable or vertically-adjustable seats
- A47C3/20—Chairs or stools with vertically-adjustable seats
- A47C3/24—Chairs or stools with vertically-adjustable seats with vertical spindle
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C3/00—Chairs characterised by structural features; Chairs or stools with rotatable or vertically-adjustable seats
- A47C3/20—Chairs or stools with vertically-adjustable seats
- A47C3/30—Chairs or stools with vertically-adjustable seats with vertically-acting fluid cylinder
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C7/00—Parts, details, or accessories of chairs or stools
- A47C7/002—Chair or stool bases
- A47C7/006—Chair or stool bases with castors
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C7/00—Parts, details, or accessories of chairs or stools
- A47C7/62—Accessories for chairs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62B—HAND-PROPELLED VEHICLES, e.g. HAND CARTS OR PERAMBULATORS; SLEDGES
- B62B2206/00—Adjustable or convertible hand-propelled vehicles or sledges
- B62B2206/06—Adjustable or convertible hand-propelled vehicles or sledges adjustable in height
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- Life Sciences & Earth Sciences (AREA)
- Environmental Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Soil Sciences (AREA)
- Agricultural Machines (AREA)
- Special Chairs (AREA)
Abstract
The present invention provides a height-adjustable three-wheeled chair, which can allow a user sitting on a seat thereof to move left and right along a furrow of a cultivated field, adjusting the level of the seat according to the surface gradient of the cultivated field, thus allowing the user to do farm work easily and conveniently. For this purpose, the present invention provides a height-adjustable three- wheeled chair, characterized in that a height-adjusting device for moving up and down a seat mounted on the top of the height-adjusting device is built in a main frame located at the bottom center of the seat to adjust the height of the seat, a running wheel is mounted on a wheel axle disposed on an upper front surface of the main frame, a pair of lifting wheels is mounted on an auxiliary frame assembled at the rear of the main frame by means of an insertion rod and a height-adjusting pipe, the insertion rod being vertically installed on an upper end of the main frame, and the height-adjusting pipe being vertically installed on the auxiliary frame and inserted downward into the outside of the insertion rod, such that the height-adjusting pipe is height-adjustably fixed to the insertion rod, thus adjusting and fixing the height of the auxiliary frame and the lifting wheels.
Description
4 1. Field of the Invention The present invention relates to a height-adjustable three-wheeled chair, and more 6 particullarly, to a height-adjustable three-wheeled chair, which can allow a user to move along a 7 furrow of a cultivated field while sitting on a seat provided thereon, to adjust the level of the 8 seat according to the surface gradient of the cultivated field, thereby improving user's 9 convenience and comfort.
2. Description of the Related Art 11 In general, since crops are grown on ridges of a cultivated field of greenhouse or 12 opened area, the cultivated field is often not flat but grooved.
13 Especially, since a farmer should bend over when growing and harvesting crops such as 14 grapes, tomatoes, red peppers, etc., the farmer frequently gets fatigued or aches in his or her back, resulting in deteriorating workability.
16 For example, in case of thinning out bunches of grapes which requires the farmer to 17 work in a stooping posture for a long time, the farmer may suffer from musculoskeletal diseases.
18 To solve these problems, Korean Utility Model Registration No. 112544 (registered on 19 April 9, 1998), entitled "Improved Chair for Farm Work" discloses a seat board that is moved up and down according to the height of a user or a growing crop to adjust the unevenness such that 21 the user can easily do farm work using the chair, and the chair can be readily transported 22 before or after the farm work.
23 Moreover, Korean Unexamined Patent Publication No. 1999-0040466 (published on 24 June 05, 1999), entitled "Furrow Work Chair" discloses a technology which allows a user sitting on the chair to move the chair left and right while doing farm work, in which wheels for moving left 26 and right are mounted at the bottom of the chair such that the worker sitting on the chair can 21846302.1 1 1 move left and right using his or her feet, and a height-adjusting means and a rotatable 2 connecting means are included in the chair.
3 The above-described prior arts relate to work chairs that allow an old person or woman 4 sitting thereon to move freely while managing the crops; however, these work chairs do not have the function of adjusting the level of the chair according to the surface gradient of the cultivated 6 field.
7 Therefore, it is difficult for the user to maintain the level while working on a slope, and 8 thus work-related fatigue is increased.
9 To solve these problems, a three-wheeled chair for farm work which includes the function of adjusting the level of the chair on a slope is disclosed in Korean Patent Registration 11 No. 0849205 (July 23, 2008) filed by the present inventor.
12 The above information disclosed in this Background section is only for enhancement of 13 understanding of the background of the invention and therefore it may contain information that 14 does not form the prior art that is already known in this country to a person of ordinary skill in the art.
18 The present invention has been made in an effort to solve the above-described problems 19 associated with prior art. Accordingly, the present invention provides a height-adjustable three-wheeled chair, which can allow a user sitting on a seat thereof to move along a furrow of a 21 cultivated field, adjusting the level of the seat according to the surface gradient of the cultivated 22 field, thereby improving user's convenience and comfort.
23 The present invention has a feature in that the functions of adjusting the height and level 24 of a thee-wheeled chair for farm work, which are disclosed in Korean Patent Application No.
2007-39112 (April 23, 2007), are improved such that a user can easily operate the three-wheeled 26 chair.
21846302.1 2 1 In one aspect, the present invention provides a height adjustable three-wheeled chair, 2 which comprising: a main frame; a seat located above the main frame; a height adjusting device 3 for moving up and down the seat, the height adjusting device being built in the main frame; a 4 wheel axle formed on an upper front surface of the main frame; a running wheel mounted on the wheel axle; an auxiliary frame assembled at the rear of the main frame by means of an insertion 6 rod and a height adjusting pipe, the insertion rod being vertically installed to the vicinity of an 7 upper end of the main frame and the height adjusting pipe being vertically installed on the 8 auxiliary frame; and a pair of lifting wheels mounted on the auxiliary frame, wherein the insertion 9 rod is configured to move up and down within the height adjusting pipe and is fixed at a desirous position such that the height of the lifting wheels and the auxiliary frame can be adjusted as 11 needed.
12 In a preferred embodiment, the auxiliary frame includes a U-shaped frame and a 13 horizontal frame, which are integrally formed with each other, the lifting wheels are rotatably 14 mounted on both ends of the U-shaped frame, and the height-adjusting pipe is vertically installed at a position corresponding to the insertion rod such that the insertion rod is inserted into the 16 inside of the height-adjusting pipe.
17 In another preferred embodiment, the insertion rod is installed at each of both sides of 18 the main frame and the height-adjusting pipe is installed at each of both sides of the auxiliary 19 frame, respectively.
In still another preferred embodiment, the insertion rod includes a plurality of insertion 21 holes spaced at a predetermined distance in the longitudinal direction, and the height-adjusting 22 pipe includes a through-hole, such that the height-adjusting pipe is fixed in the insertion rod by a 23 stopper pin inserted into a specific insertion hole of the insertion rod through the through-hole of 24 the height-adjusting pipe.
In yet another preferred embodiment, a fixing pipe, in which a lower end of a support 26 frame is inserted and fixed, is mounted on the auxiliary frame, a bucket support is integrally 21846302.1 3 1 mounted on an upper end of the support frame, and a bucket in which a harvest or a working tool 2 is put is assembled on the bucket support.
3 In still yet another preferred embodiment, the lower end of the support frame inserted 4 into the inside of the fixing pipe is fixed by a screw fixing device penetrating the fixing pipe.
In a further preferred embodiment, a rotation stop bar is installed at the wheel axle of the 6 main frame to stop the rotation of the running wheel, in which one end of the rotation stop bar is 7 rotatably connected to the wheel axle by a hinge such that the rotation stop bar is rotated 8 downward to be fitted onto the top of the outer circumference of the running wheel, thus pressing 9 the running wheel and stopping the rotation of the running wheel.
In another further preferred embodiment, wherein the height-adjusting device is a gas 11 cylinder or hydraulic cylinder type spindle device having a spindle, on which the seat is integrally 12 mounted, and vertically mounted on the main frame, such that the spindle is moved up and down 13 by the flow of working fluid in the cylinder according to the operation of an operation lever, thus 14 adjusting the height of the seat.
17 The above and other features of the present invention will be described in reference to 18 certain exemplary embodiments thereof with reference to the attached drawings in which:
19 FIG. 1 is a perspective view showing a height-adjustable three-wheeled chair in accordance with a preferred embodiment of the present invention;
21 FIG. 2 is a perspective view showing an operation state of a seat that moves up and 22 down by a cylinder device in the height-adjustable three-wheeled chair in accordance with the 23 preferred embodiment of the present invention;
24 FIG. 3 is a perspective view showing an operation state of a pair of lifting wheels that is lifted up and down in the height-adjustable three-wheeled chair of the present invention;
26 FIG. 4 is a side view showing the operation state of the pair of lifting wheels that is lifted 27 up and down in the height-adjustable three-wheeled chair of the present invention;
21846302.1 4 1 FIG. 5 is a perspective view showing a state where a support frame and a bucket are 2 assembled in the height-adjustable three-wheeled chair of the present invention; and 3 FIG. 6 is a perspective view showing a state where the rotation of a running wheel is 4 stopped by a rotation stop bar in the height-adjustable three-wheeled chair of the present invention.
6 It should be understood that the appended drawings are not necessarily to scale, 7 presenting a somewhat simplified representation of various preferred features illustrative of the 8 basic principles of the invention. The specific design features of the present invention as 9 disclosed herein, including, for example, specific dimensions, orientations, locations, and shapes will be determined in part by the particular intended application and use environment. In the 11 figures, reference numbers refer to the same or equivalent parts of the present invention 12 throughout the several figures of the drawing.
Hereinafter reference will now be made in detail to various embodiments of the present 16 invention, examples of which are illustrated in the accompanying drawings and described below.
17 While the invention will be described in conjunction with exemplary embodiments, it will be 18 understood that present description is not intended to limit the invention to those exemplary 19 embodiments. On the contrary, the invention is intended to cover not only the exemplary embodiments, but also various alternatives, modifications, equivalents and other embodiments, 21 which may be included within the spirit and scope of the invention as defined by the appended 22 claims.
23 FIG. 1 is a perspective view showing a height-adjustable three-wheeled chair in 24 accordance with a preferred embodiment of the present invention, and FIG. 2 is a perspective view showing an operation state of a seat that goes up and down by a cylinder device in the 26 height-adjustable three-wheeled chair in accordance with the preferred embodiment of the 27 present invention.
21846302.1 5 1 FIG. 3 is a perspective view showing an operation state of a pair of lifting wheels that is 2 lifted up and down in the height-adjustable three-wheeled chair of the present invention, and FIG.
3 4 is a side view showing the operation state of the pair of lifting wheels that is lifted up and down 4 in the height-adjustable three-wheeled chair of the present invention.
FIG. 5 is a perspective view showing a state where a support frame and a bucket are 6 assembled in the height-adjustable three-wheeled chair of the present invention, and FIG. 6 is a 7 perspective view showing a state where the rotation of a running wheel is stopped by a rotation 8 stop bar in the height-adjustable three-wheeled chair of the present invention.
9 As shown in FIG. 1, in a height-adjustable three-wheeled chair 100 of the present invention (hereinafter referred to as a chair), a height-adjusting device 111 for moving up and 11 down a seat 101 to adjust the height thereof is mounted on a main frame 110 located at the 12 center of the chair 100, the height-adjusting device 111 being built in the main frame 110 in the 13 vertical direction.
14 The height-adjusting device 111 may be implemented by a gas (or pneumatic) cylinder type spindle device or a hydraulic cylinder type spindle device, which are widely used as 16 height-adjusting devices of household chairs.
17 For example, a gas cylinder type spindle device includes a spindle 112 that moves up 18 and down, and the seat 101 is integrally mounted on the upper end of the spindle 112.
19 Moreover, the spindle device includes an operation lever 113 projecting from the bottom of the seat 101 to the side such that the spindle 101 integrally formed with the seat 101 is moved 21 up or down by the flow of working fluid (gas) in the cylinder in connection with the operation of 22 the operation lever 113.
23 That is, when a user operates the operation lever 113 to adjust the height of the seat 101, 24 the spindle 112 is moved up or down by the flow of working fluid (gas) in the cylinder, and thus the seat 101 is moved up or down to reach a desired height.
21846302.1 6 1 Therefore, the user can adjust the height of the seat 101 according to the height of a 2 growing crop by operating the operation lever 113, and thus the user sitting on the seat 101 can 3 do the farm work more easily and conveniently.
4 A wheel axle 114 is integrally formed on an upper front surface of the main frame 110 in the vertical direction, and a running wheel 115 is rotatably mounted on a lower end of the wheel 6 axle 114.
7 Moreover, an insertion rod 116 is vertically installed at both sides of the upper end of the 8 main frame 110, respectively.
9 Each of the insertion rods 116 includes a plurality of insertion holes 116a spaced at a predetermined distance in the longitudinal direction, and a stopper pin 124 for fixing the height of 11 an auxiliary frame 120 and a pair of lifting wheels 125, which will be described later, is inserted 12 into the insertion hole 116a.
13 Meanwhile, the chair 100 of the present invention includes the pair of lifting wheels 125 14 capable of being lifted up and down with respect to the main frame 110 and the running wheel 115 mounted thereon. The lifting wheels 125 are rotatably mounted on both ends of the 16 auxiliary frame 120 assembled at the rear of the main frame 110.
17 The auxiliary frame 120 includes a U-shaped frame 121 and a horizontal frame 122, 18 which are integrally welded to each other. Both ends extending vertically from the U-shaped 19 frame 121 of the auxiliary frame 120 serve as wheel axles, on which the lifting wheels 125 are rotatably mounted.
21 In the chair 100 of the present invention, the running wheel 115 and the lifting wheels 22 125 are mounted such that the chair 100 can move in the left and right directions with respect to 23 the user sitting on the seat 101. When the user sitting on the seat 101 pushes the ground with 24 his or her legs, the running wheel 115 and the lifting wheels 125 roll on the ground such that the user sitting on the seat 101 can move left and right.
26 Moreover, a height-adjusting pipe 123 is welded to each of both sides of the auxiliary 27 frame 120, and each of the height-adjusting pipes 123 is vertically installed at a position 21846302.1 7 1 corresponding to the insertion rod 116 such that the insertion rod 116 of the main frame 110 is 2 inserted into the inside of the height-adjusting pipe 123.
3 Each of the height-adjusting pipes 123 of the auxiliary frame 120 is inserted downward 4 into the outside of the insertion rod 116 of the main frame 110 such that the auxiliary frame 120 is assembled with the main frame 110.
6 Moreover, a through-hole 123a, through which the stopper pin 124 is inserted, is formed 7 at a specific position of the height-adjusting pipe 123.
8 As a result, after inserting the insertion rod 116 of the main frame into the inside of the 9 height-adjusting pipe 123 of the auxiliary frame 120, the through-hole 123a of the height-adjusting pipe 123 and a specific one of the plurality of the insertion holes 11 6a of the 11 insertion rod 116 are adjusted to coincide with each other, and then the stopper pin 124 is 12 inserted into the corresponding insertion hole 116a of the insertion rod 116 through the 13 through-hole 123a of the height-adjusting pipe 123 (refer to FIG. 6).
14 When the stopper pin 124 is assembled in the above manner, the height of the auxiliary frame 120 and the lifting wheels 125 is fixed.
16 FIGS. 3 and 4 show the state where the height of the auxiliary frame 120 and the lifting 17 wheels 125 is adjusted to maintain the chair 100 in a horizontal position.
Basically, when the 18 stopper pin 124 is removed from the corresponding insertion hole 116a, the height-adjusting pipe 19 123 can move up and down in the insertion rod 116, and thus the auxiliary frame 120 and the lifting wheels 125 move up and down with respect to the main frame 110, the running wheel 115, 21 and the seat 101.
22 For example, as shown in the left side of FIG. 4, when the chair 100 needs to move left 23 and right along a furrow on a cultivated field under the condition that the lifting wheels 125 are 24 placed on a furrow surface 2, which is cut lower than a ground 1 on which the running wheel 115 is placed, the height of the lifting wheels 125 should be adjusted to be lower than that of the 26 running wheel 115 depending on the depth of the furrow surface 2.
21846302.1 8 1 Accordingly, as shown in the right side of FIG. 4, when the user removes the stopper pin 2 124, the height-adjusting pipe 123 moves down along the insertion rod 116 and the entire 3 auxiliary frame 120 moves down such that the lifting wheels 125 are in contact with the furrow 4 surface 2. In this state, when the stopper pin 124 is inserted into an appropriate insertion hole 116a to fix the height of the auxiliary frame 120 and the lifting wheels 125, the chair 100 can 6 stably move while maintaining the level.
7 As such, when the stopper pin 124 is inserted and fixed in the insertion hole 116a of the 8 insertion rod 116 through the through-hole 123a of the height-adjusting pipe 123 under the 9 condition that the lifting wheels 125 are in contact with the furrow surface 2, the height of the entire auxiliary frame 120 including the lifting wheels 125 is adjusted with respect to the chair 100 11 including the main frame 110, the running wheel 115, and the seat 101.
12 When it is necessary to raise the height of the lifting wheels 125, the stopper pin 124 is 13 removed, the height-adjusting pipe 123 is raised up from the insertion rod 116, and then the 14 stopper pin 124 is inserted and fixed in an insertion hole 116a at a position higher than the previous one.
16 At this time, the auxiliary frame 120 and the lifting wheels 125 are raised up and coincide 17 with the main frame 110 and the running wheel 115.
18 The height of the auxiliary frame 120 and the lifting wheels 125 can be adjusted in 19 various ways, and thus the lifting wheels 125 may be positioned higher than the lifting wheels 125.
21 Meanwhile, as shown in FIG. 5, a fixing pipe 126, in which a lower end of a support 22 frame 131 is inserted and fixed, is welded to the side of each of the wheel axles corresponding to 23 both ends of the auxiliary frame 120, more explicitly both ends of the U-shaped frame 121. If 24 necessary, a fixing pipe (not shown) may be welded to a lower end side of the wheel axle 114 of the main frame 110.
26 In this case, a screw fixing device 127 is provided such that the lower end of the support 27 frame 131 inserted into the inside of the fixing pipe 126 is fixed thereto.
The screw fixing device 21846302.1 9 1 127 includes a handle 127a and a screw 127b and, at this time, the screw 127b penetrates the 2 fixing pipe 126 and fixes the lower end of the support frame 131 inserted into the inside of the 3 fixing pipe 126.
4 In detail, when the lower end of the support frame 131 is inserted into the inside of the fixing pipe 126 and the handle 127a of the screw fixing device 127 is rotated, the screw 127b 6 holds the lower end of the support frame 131 such that the support frame 131 is integrally fixed.
7 A bucket support 132 is integrally mounted on an upper end of the support frame 131, 8 and a bucket 133 in which a harvest or a working tool can be put is assembled on the bucket 9 support 132.
Here, it will be understood that the bucket 133 includes a basket, a box, etc., which is 11 placed on the bucket support 132 of the support frame 131 and contains a harvest or a working 12 tool.
13 FIG. 6 shows a stopping means for stopping the rotation of the running wheel 115. As 14 the stopping means, a rotation stop bar 141, which is fitted onto the outer circumference of the running wheel 115, is mounted on the wheel axle 114 of the main frame 110.
16 As shown in FIGS. 1 to 6, the rotation stop bar 141 is fabricated by bending a thin bar in a 17 U-shape and reconstructing the entire shape to match the shape of the outer circumference of 18 the running wheel 115. One end of the rotation stop bar 141 is rotatably connected to the 19 wheel axle 114 of the main frame 110 by a hinge.
When the running wheel 115 needs to be stopped, the user pulls down the rotation stop 21 bar 141, holding the other end of the rotation stop bar 141, and fits the rotation stop bar 141 22 onto the top of the outer circumference of the running wheel 115 such that the rotation stop bar 23 141 presses the running wheel 115, thus stopping the rotation of the running wheel 115.
24 Otherwise, when the running wheel 115 needs to be rotated, the user pulls up the rotation stop bar 141 such that it is connected to the wheel axle 114 of the main frame 110.
26 Therefore, the running wheel 115 is free from the influence of the rotation stop bar 141, and 27 thus it can freely roll on the ground.
21846302.1 10 1 As described above, the height-adjustable three-wheeled chair according to the present 2 invention provides the following advantages.
3 It is possible to adjust the height of the seat of the chair according to the height of a user 4 and maintain the level of the seat by adjusting the height of the lifting wheels according to the surface gradient of the cultivated field, thus allowing the user to do farm work easily and 6 conveniently. Moreover, it is possible to prevent the upper body of the user sitting on the seat 7 of the chair from being tilted, thus effectively preventing musculoskeletal diseases.
8 Especially, the height-adjustable three-wheeled chair is invented in consideration of the 9 rural manpower consisting of aged persons, and the objects of the present invention are to allow the user to freely move on an inclined furrow, maintaining the level of the seat on an 11 inclined surface and adjusting the height of the seat according to the height of a growing crop, 12 thus allowing the user to do farm work easily and conveniently.
13 Moreover, since height-adjustable three-wheeled chair is equipped with a bucket such as 14 a basket, a box, etc., in which a harvest or a working tool can be put, it is possible to improve work convenience.
16 The invention has been described in detail with reference to preferred embodiments 17 thereof. However, it will be appreciated by those skilled in the art that changes may be made in 18 these embodiments without departing from the principles and spirit of the invention, the scope of 19 which is defined in the appended claims and their equivalents.
21846302.1 11
2. Description of the Related Art 11 In general, since crops are grown on ridges of a cultivated field of greenhouse or 12 opened area, the cultivated field is often not flat but grooved.
13 Especially, since a farmer should bend over when growing and harvesting crops such as 14 grapes, tomatoes, red peppers, etc., the farmer frequently gets fatigued or aches in his or her back, resulting in deteriorating workability.
16 For example, in case of thinning out bunches of grapes which requires the farmer to 17 work in a stooping posture for a long time, the farmer may suffer from musculoskeletal diseases.
18 To solve these problems, Korean Utility Model Registration No. 112544 (registered on 19 April 9, 1998), entitled "Improved Chair for Farm Work" discloses a seat board that is moved up and down according to the height of a user or a growing crop to adjust the unevenness such that 21 the user can easily do farm work using the chair, and the chair can be readily transported 22 before or after the farm work.
23 Moreover, Korean Unexamined Patent Publication No. 1999-0040466 (published on 24 June 05, 1999), entitled "Furrow Work Chair" discloses a technology which allows a user sitting on the chair to move the chair left and right while doing farm work, in which wheels for moving left 26 and right are mounted at the bottom of the chair such that the worker sitting on the chair can 21846302.1 1 1 move left and right using his or her feet, and a height-adjusting means and a rotatable 2 connecting means are included in the chair.
3 The above-described prior arts relate to work chairs that allow an old person or woman 4 sitting thereon to move freely while managing the crops; however, these work chairs do not have the function of adjusting the level of the chair according to the surface gradient of the cultivated 6 field.
7 Therefore, it is difficult for the user to maintain the level while working on a slope, and 8 thus work-related fatigue is increased.
9 To solve these problems, a three-wheeled chair for farm work which includes the function of adjusting the level of the chair on a slope is disclosed in Korean Patent Registration 11 No. 0849205 (July 23, 2008) filed by the present inventor.
12 The above information disclosed in this Background section is only for enhancement of 13 understanding of the background of the invention and therefore it may contain information that 14 does not form the prior art that is already known in this country to a person of ordinary skill in the art.
18 The present invention has been made in an effort to solve the above-described problems 19 associated with prior art. Accordingly, the present invention provides a height-adjustable three-wheeled chair, which can allow a user sitting on a seat thereof to move along a furrow of a 21 cultivated field, adjusting the level of the seat according to the surface gradient of the cultivated 22 field, thereby improving user's convenience and comfort.
23 The present invention has a feature in that the functions of adjusting the height and level 24 of a thee-wheeled chair for farm work, which are disclosed in Korean Patent Application No.
2007-39112 (April 23, 2007), are improved such that a user can easily operate the three-wheeled 26 chair.
21846302.1 2 1 In one aspect, the present invention provides a height adjustable three-wheeled chair, 2 which comprising: a main frame; a seat located above the main frame; a height adjusting device 3 for moving up and down the seat, the height adjusting device being built in the main frame; a 4 wheel axle formed on an upper front surface of the main frame; a running wheel mounted on the wheel axle; an auxiliary frame assembled at the rear of the main frame by means of an insertion 6 rod and a height adjusting pipe, the insertion rod being vertically installed to the vicinity of an 7 upper end of the main frame and the height adjusting pipe being vertically installed on the 8 auxiliary frame; and a pair of lifting wheels mounted on the auxiliary frame, wherein the insertion 9 rod is configured to move up and down within the height adjusting pipe and is fixed at a desirous position such that the height of the lifting wheels and the auxiliary frame can be adjusted as 11 needed.
12 In a preferred embodiment, the auxiliary frame includes a U-shaped frame and a 13 horizontal frame, which are integrally formed with each other, the lifting wheels are rotatably 14 mounted on both ends of the U-shaped frame, and the height-adjusting pipe is vertically installed at a position corresponding to the insertion rod such that the insertion rod is inserted into the 16 inside of the height-adjusting pipe.
17 In another preferred embodiment, the insertion rod is installed at each of both sides of 18 the main frame and the height-adjusting pipe is installed at each of both sides of the auxiliary 19 frame, respectively.
In still another preferred embodiment, the insertion rod includes a plurality of insertion 21 holes spaced at a predetermined distance in the longitudinal direction, and the height-adjusting 22 pipe includes a through-hole, such that the height-adjusting pipe is fixed in the insertion rod by a 23 stopper pin inserted into a specific insertion hole of the insertion rod through the through-hole of 24 the height-adjusting pipe.
In yet another preferred embodiment, a fixing pipe, in which a lower end of a support 26 frame is inserted and fixed, is mounted on the auxiliary frame, a bucket support is integrally 21846302.1 3 1 mounted on an upper end of the support frame, and a bucket in which a harvest or a working tool 2 is put is assembled on the bucket support.
3 In still yet another preferred embodiment, the lower end of the support frame inserted 4 into the inside of the fixing pipe is fixed by a screw fixing device penetrating the fixing pipe.
In a further preferred embodiment, a rotation stop bar is installed at the wheel axle of the 6 main frame to stop the rotation of the running wheel, in which one end of the rotation stop bar is 7 rotatably connected to the wheel axle by a hinge such that the rotation stop bar is rotated 8 downward to be fitted onto the top of the outer circumference of the running wheel, thus pressing 9 the running wheel and stopping the rotation of the running wheel.
In another further preferred embodiment, wherein the height-adjusting device is a gas 11 cylinder or hydraulic cylinder type spindle device having a spindle, on which the seat is integrally 12 mounted, and vertically mounted on the main frame, such that the spindle is moved up and down 13 by the flow of working fluid in the cylinder according to the operation of an operation lever, thus 14 adjusting the height of the seat.
17 The above and other features of the present invention will be described in reference to 18 certain exemplary embodiments thereof with reference to the attached drawings in which:
19 FIG. 1 is a perspective view showing a height-adjustable three-wheeled chair in accordance with a preferred embodiment of the present invention;
21 FIG. 2 is a perspective view showing an operation state of a seat that moves up and 22 down by a cylinder device in the height-adjustable three-wheeled chair in accordance with the 23 preferred embodiment of the present invention;
24 FIG. 3 is a perspective view showing an operation state of a pair of lifting wheels that is lifted up and down in the height-adjustable three-wheeled chair of the present invention;
26 FIG. 4 is a side view showing the operation state of the pair of lifting wheels that is lifted 27 up and down in the height-adjustable three-wheeled chair of the present invention;
21846302.1 4 1 FIG. 5 is a perspective view showing a state where a support frame and a bucket are 2 assembled in the height-adjustable three-wheeled chair of the present invention; and 3 FIG. 6 is a perspective view showing a state where the rotation of a running wheel is 4 stopped by a rotation stop bar in the height-adjustable three-wheeled chair of the present invention.
6 It should be understood that the appended drawings are not necessarily to scale, 7 presenting a somewhat simplified representation of various preferred features illustrative of the 8 basic principles of the invention. The specific design features of the present invention as 9 disclosed herein, including, for example, specific dimensions, orientations, locations, and shapes will be determined in part by the particular intended application and use environment. In the 11 figures, reference numbers refer to the same or equivalent parts of the present invention 12 throughout the several figures of the drawing.
Hereinafter reference will now be made in detail to various embodiments of the present 16 invention, examples of which are illustrated in the accompanying drawings and described below.
17 While the invention will be described in conjunction with exemplary embodiments, it will be 18 understood that present description is not intended to limit the invention to those exemplary 19 embodiments. On the contrary, the invention is intended to cover not only the exemplary embodiments, but also various alternatives, modifications, equivalents and other embodiments, 21 which may be included within the spirit and scope of the invention as defined by the appended 22 claims.
23 FIG. 1 is a perspective view showing a height-adjustable three-wheeled chair in 24 accordance with a preferred embodiment of the present invention, and FIG. 2 is a perspective view showing an operation state of a seat that goes up and down by a cylinder device in the 26 height-adjustable three-wheeled chair in accordance with the preferred embodiment of the 27 present invention.
21846302.1 5 1 FIG. 3 is a perspective view showing an operation state of a pair of lifting wheels that is 2 lifted up and down in the height-adjustable three-wheeled chair of the present invention, and FIG.
3 4 is a side view showing the operation state of the pair of lifting wheels that is lifted up and down 4 in the height-adjustable three-wheeled chair of the present invention.
FIG. 5 is a perspective view showing a state where a support frame and a bucket are 6 assembled in the height-adjustable three-wheeled chair of the present invention, and FIG. 6 is a 7 perspective view showing a state where the rotation of a running wheel is stopped by a rotation 8 stop bar in the height-adjustable three-wheeled chair of the present invention.
9 As shown in FIG. 1, in a height-adjustable three-wheeled chair 100 of the present invention (hereinafter referred to as a chair), a height-adjusting device 111 for moving up and 11 down a seat 101 to adjust the height thereof is mounted on a main frame 110 located at the 12 center of the chair 100, the height-adjusting device 111 being built in the main frame 110 in the 13 vertical direction.
14 The height-adjusting device 111 may be implemented by a gas (or pneumatic) cylinder type spindle device or a hydraulic cylinder type spindle device, which are widely used as 16 height-adjusting devices of household chairs.
17 For example, a gas cylinder type spindle device includes a spindle 112 that moves up 18 and down, and the seat 101 is integrally mounted on the upper end of the spindle 112.
19 Moreover, the spindle device includes an operation lever 113 projecting from the bottom of the seat 101 to the side such that the spindle 101 integrally formed with the seat 101 is moved 21 up or down by the flow of working fluid (gas) in the cylinder in connection with the operation of 22 the operation lever 113.
23 That is, when a user operates the operation lever 113 to adjust the height of the seat 101, 24 the spindle 112 is moved up or down by the flow of working fluid (gas) in the cylinder, and thus the seat 101 is moved up or down to reach a desired height.
21846302.1 6 1 Therefore, the user can adjust the height of the seat 101 according to the height of a 2 growing crop by operating the operation lever 113, and thus the user sitting on the seat 101 can 3 do the farm work more easily and conveniently.
4 A wheel axle 114 is integrally formed on an upper front surface of the main frame 110 in the vertical direction, and a running wheel 115 is rotatably mounted on a lower end of the wheel 6 axle 114.
7 Moreover, an insertion rod 116 is vertically installed at both sides of the upper end of the 8 main frame 110, respectively.
9 Each of the insertion rods 116 includes a plurality of insertion holes 116a spaced at a predetermined distance in the longitudinal direction, and a stopper pin 124 for fixing the height of 11 an auxiliary frame 120 and a pair of lifting wheels 125, which will be described later, is inserted 12 into the insertion hole 116a.
13 Meanwhile, the chair 100 of the present invention includes the pair of lifting wheels 125 14 capable of being lifted up and down with respect to the main frame 110 and the running wheel 115 mounted thereon. The lifting wheels 125 are rotatably mounted on both ends of the 16 auxiliary frame 120 assembled at the rear of the main frame 110.
17 The auxiliary frame 120 includes a U-shaped frame 121 and a horizontal frame 122, 18 which are integrally welded to each other. Both ends extending vertically from the U-shaped 19 frame 121 of the auxiliary frame 120 serve as wheel axles, on which the lifting wheels 125 are rotatably mounted.
21 In the chair 100 of the present invention, the running wheel 115 and the lifting wheels 22 125 are mounted such that the chair 100 can move in the left and right directions with respect to 23 the user sitting on the seat 101. When the user sitting on the seat 101 pushes the ground with 24 his or her legs, the running wheel 115 and the lifting wheels 125 roll on the ground such that the user sitting on the seat 101 can move left and right.
26 Moreover, a height-adjusting pipe 123 is welded to each of both sides of the auxiliary 27 frame 120, and each of the height-adjusting pipes 123 is vertically installed at a position 21846302.1 7 1 corresponding to the insertion rod 116 such that the insertion rod 116 of the main frame 110 is 2 inserted into the inside of the height-adjusting pipe 123.
3 Each of the height-adjusting pipes 123 of the auxiliary frame 120 is inserted downward 4 into the outside of the insertion rod 116 of the main frame 110 such that the auxiliary frame 120 is assembled with the main frame 110.
6 Moreover, a through-hole 123a, through which the stopper pin 124 is inserted, is formed 7 at a specific position of the height-adjusting pipe 123.
8 As a result, after inserting the insertion rod 116 of the main frame into the inside of the 9 height-adjusting pipe 123 of the auxiliary frame 120, the through-hole 123a of the height-adjusting pipe 123 and a specific one of the plurality of the insertion holes 11 6a of the 11 insertion rod 116 are adjusted to coincide with each other, and then the stopper pin 124 is 12 inserted into the corresponding insertion hole 116a of the insertion rod 116 through the 13 through-hole 123a of the height-adjusting pipe 123 (refer to FIG. 6).
14 When the stopper pin 124 is assembled in the above manner, the height of the auxiliary frame 120 and the lifting wheels 125 is fixed.
16 FIGS. 3 and 4 show the state where the height of the auxiliary frame 120 and the lifting 17 wheels 125 is adjusted to maintain the chair 100 in a horizontal position.
Basically, when the 18 stopper pin 124 is removed from the corresponding insertion hole 116a, the height-adjusting pipe 19 123 can move up and down in the insertion rod 116, and thus the auxiliary frame 120 and the lifting wheels 125 move up and down with respect to the main frame 110, the running wheel 115, 21 and the seat 101.
22 For example, as shown in the left side of FIG. 4, when the chair 100 needs to move left 23 and right along a furrow on a cultivated field under the condition that the lifting wheels 125 are 24 placed on a furrow surface 2, which is cut lower than a ground 1 on which the running wheel 115 is placed, the height of the lifting wheels 125 should be adjusted to be lower than that of the 26 running wheel 115 depending on the depth of the furrow surface 2.
21846302.1 8 1 Accordingly, as shown in the right side of FIG. 4, when the user removes the stopper pin 2 124, the height-adjusting pipe 123 moves down along the insertion rod 116 and the entire 3 auxiliary frame 120 moves down such that the lifting wheels 125 are in contact with the furrow 4 surface 2. In this state, when the stopper pin 124 is inserted into an appropriate insertion hole 116a to fix the height of the auxiliary frame 120 and the lifting wheels 125, the chair 100 can 6 stably move while maintaining the level.
7 As such, when the stopper pin 124 is inserted and fixed in the insertion hole 116a of the 8 insertion rod 116 through the through-hole 123a of the height-adjusting pipe 123 under the 9 condition that the lifting wheels 125 are in contact with the furrow surface 2, the height of the entire auxiliary frame 120 including the lifting wheels 125 is adjusted with respect to the chair 100 11 including the main frame 110, the running wheel 115, and the seat 101.
12 When it is necessary to raise the height of the lifting wheels 125, the stopper pin 124 is 13 removed, the height-adjusting pipe 123 is raised up from the insertion rod 116, and then the 14 stopper pin 124 is inserted and fixed in an insertion hole 116a at a position higher than the previous one.
16 At this time, the auxiliary frame 120 and the lifting wheels 125 are raised up and coincide 17 with the main frame 110 and the running wheel 115.
18 The height of the auxiliary frame 120 and the lifting wheels 125 can be adjusted in 19 various ways, and thus the lifting wheels 125 may be positioned higher than the lifting wheels 125.
21 Meanwhile, as shown in FIG. 5, a fixing pipe 126, in which a lower end of a support 22 frame 131 is inserted and fixed, is welded to the side of each of the wheel axles corresponding to 23 both ends of the auxiliary frame 120, more explicitly both ends of the U-shaped frame 121. If 24 necessary, a fixing pipe (not shown) may be welded to a lower end side of the wheel axle 114 of the main frame 110.
26 In this case, a screw fixing device 127 is provided such that the lower end of the support 27 frame 131 inserted into the inside of the fixing pipe 126 is fixed thereto.
The screw fixing device 21846302.1 9 1 127 includes a handle 127a and a screw 127b and, at this time, the screw 127b penetrates the 2 fixing pipe 126 and fixes the lower end of the support frame 131 inserted into the inside of the 3 fixing pipe 126.
4 In detail, when the lower end of the support frame 131 is inserted into the inside of the fixing pipe 126 and the handle 127a of the screw fixing device 127 is rotated, the screw 127b 6 holds the lower end of the support frame 131 such that the support frame 131 is integrally fixed.
7 A bucket support 132 is integrally mounted on an upper end of the support frame 131, 8 and a bucket 133 in which a harvest or a working tool can be put is assembled on the bucket 9 support 132.
Here, it will be understood that the bucket 133 includes a basket, a box, etc., which is 11 placed on the bucket support 132 of the support frame 131 and contains a harvest or a working 12 tool.
13 FIG. 6 shows a stopping means for stopping the rotation of the running wheel 115. As 14 the stopping means, a rotation stop bar 141, which is fitted onto the outer circumference of the running wheel 115, is mounted on the wheel axle 114 of the main frame 110.
16 As shown in FIGS. 1 to 6, the rotation stop bar 141 is fabricated by bending a thin bar in a 17 U-shape and reconstructing the entire shape to match the shape of the outer circumference of 18 the running wheel 115. One end of the rotation stop bar 141 is rotatably connected to the 19 wheel axle 114 of the main frame 110 by a hinge.
When the running wheel 115 needs to be stopped, the user pulls down the rotation stop 21 bar 141, holding the other end of the rotation stop bar 141, and fits the rotation stop bar 141 22 onto the top of the outer circumference of the running wheel 115 such that the rotation stop bar 23 141 presses the running wheel 115, thus stopping the rotation of the running wheel 115.
24 Otherwise, when the running wheel 115 needs to be rotated, the user pulls up the rotation stop bar 141 such that it is connected to the wheel axle 114 of the main frame 110.
26 Therefore, the running wheel 115 is free from the influence of the rotation stop bar 141, and 27 thus it can freely roll on the ground.
21846302.1 10 1 As described above, the height-adjustable three-wheeled chair according to the present 2 invention provides the following advantages.
3 It is possible to adjust the height of the seat of the chair according to the height of a user 4 and maintain the level of the seat by adjusting the height of the lifting wheels according to the surface gradient of the cultivated field, thus allowing the user to do farm work easily and 6 conveniently. Moreover, it is possible to prevent the upper body of the user sitting on the seat 7 of the chair from being tilted, thus effectively preventing musculoskeletal diseases.
8 Especially, the height-adjustable three-wheeled chair is invented in consideration of the 9 rural manpower consisting of aged persons, and the objects of the present invention are to allow the user to freely move on an inclined furrow, maintaining the level of the seat on an 11 inclined surface and adjusting the height of the seat according to the height of a growing crop, 12 thus allowing the user to do farm work easily and conveniently.
13 Moreover, since height-adjustable three-wheeled chair is equipped with a bucket such as 14 a basket, a box, etc., in which a harvest or a working tool can be put, it is possible to improve work convenience.
16 The invention has been described in detail with reference to preferred embodiments 17 thereof. However, it will be appreciated by those skilled in the art that changes may be made in 18 these embodiments without departing from the principles and spirit of the invention, the scope of 19 which is defined in the appended claims and their equivalents.
21846302.1 11
Claims (8)
1. A height adjustable three-wheeled chair, comprising:
a main frame; a seat located above the main frame; a height adjusting device for moving up and down the seat, the height adjusting device being built in the main frame; a wheel axle formed on an upper front surface of the main frame; a running wheel mounted on the wheel axle; an auxiliary frame assembled at the rear of the main frame by means of an insertion rod and a height adjusting pipe, the insertion rod being vertically installed to the vicinity of an upper end of the main frame and the height adjusting pipe being vertically installed on the auxiliary frame; and a pair of lifting wheels mounted on the auxiliary frame, wherein the insertion rod is configured to move up and down within the height adjusting pipe and is fixed at a desirous position such that the height of the lifting wheels and the auxiliary frame can be adjusted as needed.
a main frame; a seat located above the main frame; a height adjusting device for moving up and down the seat, the height adjusting device being built in the main frame; a wheel axle formed on an upper front surface of the main frame; a running wheel mounted on the wheel axle; an auxiliary frame assembled at the rear of the main frame by means of an insertion rod and a height adjusting pipe, the insertion rod being vertically installed to the vicinity of an upper end of the main frame and the height adjusting pipe being vertically installed on the auxiliary frame; and a pair of lifting wheels mounted on the auxiliary frame, wherein the insertion rod is configured to move up and down within the height adjusting pipe and is fixed at a desirous position such that the height of the lifting wheels and the auxiliary frame can be adjusted as needed.
2. The height-adjustable three-wheeled chair of claim 1, wherein the auxiliary frame comprises a U-shaped frame and a horizontal frame, which are integrally formed with each other, the lifting wheels are rotatably mounted on both ends of the U-shaped frame, and the height-adjusting pipe is vertically installed at a position corresponding to the insertion rod such that the insertion rod is inserted into the inside of the height adjusting pipe.
3. The height-adjustable three-wheeled chair of claim 2, wherein the insertion rod is installed at a side of the main frame and the height-adjusting pipe is installed at a side of the auxiliary frame, respectively, and further comprising a second insertion rod installed at a second side of the main frame and a second height adjusting pipe installed at a second side of the auxiliary frame.
4. The height-adjustable three-wheeled chair of claim 1, wherein the insertion rod comprises a plurality of insertion holes spaced at a predetermined distance in the longitudinal direction, and the height-adjusting pipe comprises a through-hole, such that the height-adjusting pipe is fixed in the insertion rod by a stopper pin inserted into a specific insertion hole of the insertion rod through the through-hole of the height-adjusting pipe.
5. The height-adjustable three-wheeled chair of claim 1, wherein a fixing pipe, in which a lower end of a support frame is inserted and fixed, is mounted on the auxiliary frame, a bucket support is integrally mounted on an upper end of the support frame, and a bucket in which a harvest or a working tool is put is assembled on the bucket support.
6. The height-adjustable three-wheeled chair of claim 5, wherein the lower end of the support frame inserted into the inside of the fixing pipe is fixed by a screw fixing device penetrating the fixing pipe.
7. The height-adjustable three-wheeled chair of claim 1, wherein a rotation stop bar is installed at the wheel axle of the main frame to stop the rotation of the running wheel, in which one end of the rotation stop bar is rotatably connected to the wheel axle by a hinge such that the rotation stop bar is rotated downward to be fitted onto the top of the outer circumference of the running wheel, thus pressing the running wheel and stopping the rotation of the running wheel.
8. The height-adjustable three-wheeled chair of claim 1, wherein the height-adjusting device is a gas cylinder or hydraulic cylinder type spindle device having a spindle, on which the seat is integrally mounted, and vertically mounted on the main frame, such that the spindle is moved up and down by the flow of working fluid in the cylinder according to the operation of an operation lever, thus adjusting the height of the seat.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2008-0025119 | 2008-03-18 | ||
| KR1020080025119A KR100990843B1 (en) | 2008-03-18 | 2008-03-18 | 3-Wheel chair capable of setting height |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2650116A1 CA2650116A1 (en) | 2009-09-18 |
| CA2650116C true CA2650116C (en) | 2011-11-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2650116A Active CA2650116C (en) | 2008-03-18 | 2009-01-16 | Height-adjustable three-wheeled chair |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR100990843B1 (en) |
| CA (1) | CA2650116C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8590907B2 (en) * | 2010-04-15 | 2013-11-26 | White Pine Concepts Llc | Gardening stool |
| KR200491671Y1 (en) | 2019-06-17 | 2020-05-15 | 김성림 | Frame of multi-purpose Working chair |
| CN113575134B (en) * | 2020-12-15 | 2022-05-27 | 安徽九合堂国药有限公司 | Eucommia bark mining device for Chinese herbal medicine processing and using method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61154716U (en) * | 1985-03-19 | 1986-09-25 | ||
| KR200428549Y1 (en) * | 2006-07-28 | 2006-10-16 | 인성교 | Farm products picking machine |
-
2008
- 2008-03-18 KR KR1020080025119A patent/KR100990843B1/en active IP Right Grant
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2009
- 2009-01-16 CA CA2650116A patent/CA2650116C/en active Active
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| Publication number | Publication date |
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| KR20090099883A (en) | 2009-09-23 |
| CA2650116A1 (en) | 2009-09-18 |
| KR100990843B1 (en) | 2010-11-01 |
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