Front wheel structure and wheelchair

Abstract

A front wheel structure comprises a front wheel and a front fork, one end of the front fork is connected with the front wheel, the other end of the front fork is connected with a wheelchair through a front fork arm, the front fork is connected with the front fork arm through a multi-dimensional adjusting mechanism, and the multi-dimensional adjusting mechanism is configured to be capable of adjusting the front-back swing angle and the left-right rotation angle of the front fork. According to the scheme, the first tooth surface structure on the bottom side of the first connecting block is meshed with the second tooth surface structure on the top side of the second connecting block, so that the front fork with the swing angle adjusted is fixedly supported, and the problem that the front fork slips due to sliding of the connecting position is solved; besides, the rotating angle of the first connecting piece is controlled through the adjusting bolt, the advancing direction of the front wheel can be adjusted, and the situation that the front wheel deviates leftwards and rightwards in the advancing process is avoided; through the adjustment, the connecting shaft can be kept perpendicular to the horizontal plane all the time, the situation of guiding deviation of the front wheel is avoided, and the use stability and safety of the front wheel are guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of wheelchairs, and particularly to a front wheel structure and a wheelchair. Background Art

[0002] Currently, for wheelchairs in the prior art, the structure of the front wheel can rotate freely around an axis perpendicular to the horizontal plane to change the forward direction of the wheelchair, but generally cannot swing around an axis parallel to the horizontal plane. After the front wheel is adjusted to be inclined and lifted through other adjustment mechanisms, the axis perpendicular to the horizontal plane of the front wheel before and after lifting will shift, and adjustment is required to avoid vibration or jitter of the front wheel during driving. Based on this, a Chinese invention patent proposes a horizontal adjustment structure for a wheelchair front fork bearing (CN 208710303 U), which includes a front wheel and a front fork. One end of the front fork is connected to the front wheel, and the other end is connected to the wheelchair through a front fork arm. A circular sleeve is provided at the other end of the front fork arm. A first tensioning block, a second tensioning block, and an adjustment bolt that are axially fixed or axially rotatable relative to the circular sleeve are installed in the circular sleeve. An arc-shaped adjustment groove is provided at the bottom of the circular sleeve along the arc contour. The first tensioning block and the second tensioning block are connected with a connecting shaft extending out of the arc-shaped adjustment groove, and the other end of the connecting shaft is connected to the front fork. The connecting shaft swings along the arc-shaped adjustment groove to achieve the adjustment of the front wheel.

[0003] However, the above structure has three problems: (1) The structure is complex and the operation is inconvenient; (2) It is difficult to fix the swing angle; (3) The front wheel is prone to left and right offset and is difficult to control.

[0004] Therefore, in view of the deficiencies of the prior art, it is necessary to design a front wheel structure and a wheelchair to solve the above problems. Summary of the Invention

[0005] To overcome the above deficiencies in the prior art, the purpose of the present invention is to provide a front wheel structure and a wheelchair.

[0006] To achieve the above purpose and other related purposes, the technical solution provided by the present invention is: a front wheel structure, including a front wheel and a front fork. One end of the front fork is connected to the front wheel, and the other end of the front fork is connected to the wheelchair through a front fork arm. The front fork and the front fork arm are connected through a multi-dimensional adjustment mechanism, and the multi-dimensional adjustment mechanism is configured to be able to adjust the front and rear swing angles and the left and right rotation angles of the front fork.

[0007] The preferred technical solution is as follows: The multi-dimensional adjustment mechanism is composed of a sleeve, a connecting shaft, a pin shaft, a first connecting piece and a second connecting piece. The sleeve is formed on the front fork arm. The first connecting piece is rotatably arranged at the bottom end of the sleeve. A guiding hole is provided on the first connecting piece. The top end of the connecting shaft extends into the sleeve through the guiding hole. A swinging hole is provided at the top end of the connecting shaft. The pin shaft is inserted into the sleeve and passes through the swinging hole. The bottom end of the connecting shaft is rotatably connected to the front fork. The second connecting piece is sleeved on the connecting shaft. An arc-shaped tooth surface one is provided on the bottom side of the first connecting piece. An arc-shaped tooth surface two is provided on the top side of the second connecting piece. The arc-shaped tooth surface one and the arc-shaped tooth surface two are meshed and configured to support and fix the front-back swinging angle of the connecting shaft.

[0008] The preferred technical solution is as follows: The guiding hole is a kidney-shaped hole, and the guiding hole is arranged in the front-back direction.

[0009] The preferred technical solution is as follows: The swinging hole is a kidney-shaped hole, and the swinging hole is arranged along the axial direction of the connecting shaft.

[0010] The preferred technical solution is as follows: A regulating ear is formed on the part of the first connecting piece extending into the sleeve, and a screw hole is provided on the regulating ear; Strip-shaped regulating windows are arranged on the circumferential wall of the sleeve; A regulating bolt is further included. The regulating bolt is screwed into the screw hole through the regulating window and is configured to adjust the left-right rotation angle of the first connecting piece.

[0011] The preferred technical solution is as follows: A sealing cover is provided at the top end of the sleeve, and the sealing cover is hermetically connected to the sleeve through a sealing ring.

[0012] The preferred technical solution is as follows: A groove is provided at the top end of the front fork. A bearing is provided in the groove. The outer ring of the bearing is fixedly connected to the groove, and the inner ring of the bearing is fixedly connected to the bottom end of the connecting shaft.

[0013] The preferred technical solution is as follows: A ring-shaped protrusion corresponding to the inner ring of the bearing is provided on the bottom side of the second connecting piece.

[0014] The preferred technical solution is as follows: A hoop is provided on the front fork arm away from the front fork arm, and the hoop is used to connect to the wheelchair.

[0015] A wheelchair includes the above-mentioned front wheel structure.

[0016] Due to the application of the above technical solution, the beneficial effects of the present invention are as follows: A front-wheel structure and a wheelchair proposed by the present invention fix and support the front fork after adjusting the swing angle by meshing the tooth surface structure one on the bottom side of the connecting block one with the tooth surface structure two on the top side of the connecting block two, avoiding the problem of the front fork slipping off caused by the sliding at the connection; in addition, by adjusting the bolt to control the rotation angle of the connecting piece one, the traveling direction of the front wheel can be adjusted, avoiding the situation of left and right deviation of the front wheel during traveling; through this adjustment, even if the front fork arm realizes inclined lifting through one end cooperating with the wheelchair, the front wheel can be adjusted through the above structure, finally keeping the connecting shaft always perpendicular to the horizontal plane and avoiding the situation of guiding deviation of the front wheel, ensuring the use stability and safety of the front wheel. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the front-wheel structure related to the present invention.

[0018] Figure 2 It is an exploded view of the front wheel related to the present invention.

[0019] Figure 3 It is a schematic diagram of the structure of the connecting piece one related to the present invention.

[0020] Figure 4 It is a schematic diagram of the structure of the connecting piece two related to the present invention.

[0021] Reference numerals: 1, front wheel; 2, front fork; 3, front fork arm; 301, sleeve; 3011, adjustment window; 302, hoop; 4, connecting shaft; 401, swing hole; 5, pin shaft; 6, connecting piece one; 601, guide hole; 602, arc-shaped tooth surface one; 603, adjustment ear; 604, screw hole; 7, connecting piece two; 701, arc-shaped tooth surface two; 702, annular protrusion; 8, bearing; 9, sealing cover; 10, sealing ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The following specific embodiments illustrate the implementation manners of the present invention, and those skilled in the art can easily understand the other advantages and effects of the present invention from the content disclosed in this specification.

[0023] Please refer to Figures 1 - 4Note that in the description of the present invention, it should be noted that for the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the inventive product is customarily placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and should not be construed as indicating or implying relative importance. The terms "horizontal", "vertical", "overhanging", etc. do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0024] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "install", "connect", "couple" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection, it can be a mechanical connection, an electrical connection, a direct connection, or an indirect connection through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0025] Embodiment: As Figures 1 to 4 shown, according to a general technical concept of the present invention, a front wheel (1) structure is provided, which includes a front wheel (1) and a front fork (2). One end of the front fork (2) is connected to the front wheel (1), and the other end of the front fork (2) is connected to a wheelchair through a front fork arm (3). The front fork (2) and the front fork arm (3) are connected through a multi-dimensional adjustment mechanism, and the multi-dimensional adjustment mechanism is configured to be able to adjust the front and rear swing angles and the left and right rotation angles of the front fork (2). When the front wheel (1) realizes tilting lifting adjustment through the front fork arm (3), the axis perpendicular to the horizontal plane of the front wheel (1) before and after lifting will shift, and it can be adjusted through the multi-dimensional adjustment mechanism to avoid vibration or jitter of the front wheel (1) during driving; and, it can also be adjusted through the multi-dimensional adjustment mechanism to avoid the problem of left deviation or right deviation of the front wheel (1) during traveling.

[0026] As Figures 1 to 4As shown, in an exemplary embodiment of the present invention, the multi-dimensional adjustment mechanism is composed of a sleeve (301), a connecting shaft (4), a pin shaft (5), a first connecting member (6) and a second connecting member (7). The sleeve (301) is formed on the front fork arm (3). The first connecting member (6) is rotatably arranged at the bottom end of the sleeve (301). A guiding hole (601) is provided on the first connecting member (6). The top end of the connecting shaft (4) extends into the sleeve (301) through the guiding hole (601). A swinging hole (401) is provided at the top end of the connecting shaft (4). The pin shaft (5) is inserted into the sleeve (301) and passes through the swinging hole (401). The bottom end of the connecting shaft (4) is rotatably connected to the front fork (2). The second connecting member (7) is sleeved on the connecting shaft (4). An arc-shaped tooth surface one (602) is provided on the bottom side of the first connecting member (6). An arc-shaped tooth surface two (701) is provided on the top side of the second connecting member (7). The arc-shaped tooth surface one (602) and the arc-shaped tooth surface two (701) are meshed and configured to support and fix the front-back swinging angle of the connecting shaft (4). That is, the connecting shaft (4) can drive the front fork (2) to swing back and forth around the pin shaft (5) to adapt to the height change of the front wheel (1). After adjustment, the first connecting member (6) is pressed against the second connecting member (7), the arc-shaped tooth surface one (602) is meshed with the arc-shaped tooth surface two (701), and the second connecting member (7) is pressed against the front fork (2). This structure plays a role in supporting and fixing the swinging angle of the front fork (2) and avoiding the vehicle body tremor caused by the change of the swinging angle during driving.

[0027] As Figures 1 to 4 shown, in an exemplary embodiment of the present invention, the guiding hole (601) is a kidney-shaped hole, and the guiding hole (601) is arranged in the front-back direction. This structure is used to adapt to the adjustment of the front-back swinging angle of the connecting shaft (4).

[0028] As Figures 1 to 4 shown, in an exemplary embodiment of the present invention, the swinging hole (401) is a kidney-shaped hole, and the swinging hole (401) is arranged along the axial direction of the connecting shaft (4). This structure facilitates lifting the front side of the wheelchair to make the connecting shaft (4) freely droop under the self-weight of the front wheel (1), thereby separating the first connecting member (6) from the second connecting member (7) to adjust the meshing angle between the arc-shaped tooth surface one (602) and the arc-shaped tooth surface two (701).

[0029] As Figures 1 to 4As shown, in an exemplary embodiment of the present invention, a portion of the first connecting member (6) extending into the sleeve (301) is formed with an adjusting ear (603), and a threaded hole (604) is provided on the adjusting ear (603); a strip-shaped adjusting window (3011) arranged circumferentially is provided on the wall of the sleeve (301); further included is an adjusting bolt (not shown), and the adjusting bolt is screwed into the threaded hole (604) through the adjusting window (3011) and is configured to adjust the left and right rotation angle of the first connecting member (6); an arc-shaped tooth surface one (602) on the bottom side of the first connecting member (6) is meshed with an arc-shaped tooth surface two (701) on the top side of the second connecting member (7), and the second connecting member (7) is pressed against the front fork (2) during the wheelchair's travel, and the two together constitute a structure for guiding the traveling direction of the front wheel (1). By adjusting the rotation angle of the first connecting member (6), the traveling direction of the front wheel (1) can be adjusted, avoiding the situation of left and right deviation of the front wheel (1) during travel.

[0030] As Figures 1 to 4 shown, in an exemplary embodiment of the present invention, a sealing cover (9) is provided at the top end of the sleeve (301), and the sealing cover (9) is sealingly connected to the sleeve (301) through a sealing ring (10); this structure is used to prevent water from entering the sleeve (301) and rusting, affecting the service life.

[0031] As Figures 1 to 4 shown, in an exemplary embodiment of the present invention, a slot is provided at the top end of the front fork (2), a bearing (8) is provided in the slot, the outer ring of the bearing (8) is fixedly connected to the slot, and the inner ring of the bearing (8) is fixedly connected to the bottom end of the connecting shaft (4); this structure is used to achieve the rotational connection between the connecting shaft (4) and the front fork (2).

[0032] As Figures 1 to 4 shown, in an exemplary embodiment of the present invention, a ring-shaped protrusion (702) corresponding to the inner ring of the bearing (8) is provided on the bottom side of the second connecting member (7); this structure is used to prevent the second connecting member (7) from damaging the bearing (8).

[0033] As Figures 1 to 4 shown, in an exemplary embodiment of the present invention, a hoop (302) is provided on the front fork arm (3) away from the front fork arm (3), and the hoop (302) is used to connect to the wheelchair to achieve height adjustment of the front wheel (1).

[0034] In addition, the present application also relates to a wheelchair including the above-mentioned front wheel structure.

[0035] Therefore, the present invention has the following advantages: A front wheel structure and a wheelchair proposed by the present invention are provided. The tooth surface structure one on the bottom side of the connecting block one is engaged with the tooth surface structure two on the top side of the connecting block two to fix and support the front fork after the swing angle is adjusted, avoiding the problem of the front fork slipping off caused by the sliding at the connection. In addition, by adjusting the bolt to control the rotation angle of the connecting piece one, the traveling direction of the front wheel can be adjusted, avoiding the situation of left and right deviation of the front wheel during traveling. Through this adjustment, even if the front fork arm realizes inclined lifting through one end in cooperation with the wheelchair, the front wheel can be adjusted through the above structure, and finally the connecting shaft can always be kept perpendicular to the horizontal plane, and the situation of guiding deviation of the front wheel can be avoided, ensuring the use stability and safety of the front wheel.

[0036] The above embodiments are only illustrative of the principles and effects of the present invention, and are not used to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A front wheel structure, comprising a front wheel and a front fork, one end of the front fork is connected to the front wheel, and the other end of the front fork is connected to a wheelchair through a front fork arm, and is characterized in that: The front fork and the front fork arm are connected by a multi-dimensional adjustment mechanism, and the multi-dimensional adjustment mechanism is configured to be able to adjust the front and rear swing angles and the left and right rotation angles of the front fork.

2. The front wheel structure according to claim 1, characterized in that: The multi-dimensional adjustment mechanism is composed of a sleeve, a connecting shaft, a pin shaft, a first connecting piece and a second connecting piece. The sleeve is formed on the front fork arm. The first connecting piece is rotatably arranged at the bottom end of the sleeve. A guiding hole is provided on the first connecting piece. The top end of the connecting shaft extends into the sleeve through the guiding hole. A swinging hole is provided at the top end of the connecting shaft. The pin shaft is inserted into the sleeve and passes through the swinging hole. The bottom end of the connecting shaft is rotatably connected to the front fork. The second connecting piece is sleeved on the connecting shaft. An arc-shaped tooth surface one is provided on the bottom side of the first connecting piece. An arc-shaped tooth surface two is provided on the top side of the second connecting piece. The arc-shaped tooth surface one and the arc-shaped tooth surface two are meshed and configured to support and fix the front and rear swing angles of the connecting shaft.

3. The front wheel structure according to claim 2, characterized in that: The guiding hole is a kidney-shaped hole and is arranged in the front and rear direction.

4. A front wheel structure according to claim 2, characterized in that: The swinging hole is a kidney-shaped hole and is arranged along the axial direction of the connecting shaft.

5. The front wheel structure according to claim 2, characterized in that: A part of the first connecting piece extending into the sleeve forms an adjusting ear, and a screw hole is provided on the adjusting ear; strip-shaped adjusting windows are arranged on the barrel wall of the sleeve in the circumferential direction; an adjusting bolt is further included, and the adjusting bolt is screwed into the screw hole through the adjusting window and is configured to adjust the left and right rotation angles of the first connecting piece.

6. The front wheel structure according to claim 2, wherein: A sealing cover is provided at the top end of the sleeve, and the sealing cover and the sleeve are hermetically connected through a sealing ring.

7. A front wheel structure according to claim 2, characterized in that: A groove is provided at the top end of the front fork, a bearing is provided in the groove, the outer ring of the bearing is fixedly connected to the groove, and the inner ring of the bearing is fixedly connected to the bottom end of the connecting shaft.

8. A front wheel structure according to claim 7, characterized in that: A circular protrusion corresponding to the inner ring of the bearing is provided on the bottom side of the second connecting piece.

9. A front wheel structure according to claim 1, characterized in that: A hoop is provided on the front fork arm away from the front fork arm, and the hoop is used to connect to the wheelchair.

10. A wheelchair, characterized in that: It includes a front wheel structure according to any one of claims 1-9.

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