Bicycle repair stand adjustable in height

Abstract

A bicycle repair stand adjustable in height includes a lower support (1), a first rotating set (4), a second rotating set (5), and an upper support (7). The lower support (1) has a first pivot portion (P1) and a second pivot portion (P2). The first rotating set (4) has a third pivot portion (P3) and a first gear (41). The third pivot portion (P3) is pivotably connected with the first pivot portion (P1). The first gear (41) rotates along with the third pivot portion (P3). The second rotating set (5) has a fourth pivot portion (P4) and a second gear (51). The fourth pivot portion (P4) is pivotably connected with the second pivot portion (P2). The second gear (51) is rotated by the first gear (41). The axes of the first gear (41) and the second gear (51) are perpendicular to each other. The upper support (7) has a gear rack (73). The gear rack (73) is engaged with the second gear (51), and the rotation of the second gear (51) drives the upper support (7) to ascend and descend relative to the lower support (1). The axes of the gears being perpendicular to each other makes the gear rack (73) uneasy to rotate the gears, so as to attain to simplified structure and avoid the situation of descending due to a heavy load, solving the conventional structure's problem of complication or being prone to malfunction.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention

[0001] The present invention relates to bicycle repair stands and more particularly, to a bicycle repair stand adjustable in height.2. Description of the Related Art

[0002] The currently existing bicycle repair stand, such as that disclosed in Taiwan Patent No. M646306 applied for by the applicant of the present invention, has a lifting device for the user to adjust the height of a supporting rod. The lifting device has various kinds of anti-rotation element structures. When a bicycle relatively heavier in weight, such as an electric assisted bicycle, is clamped to a fixture, the risk of rapid descending can be avoided. However, the bicycle repair stand is relatively more complicated in structure, and may be prone to malfunction, so it needs simplification and improvement.SUMMARY OF THE INVENTION

[0003] The present invention has been accomplished in view of the above-noted circumstances. It is an objective of the present invention to provide a bicycle repair stand which uses simple structure to avoid the situation of descending due to a heavy load.

[0004] To attain the above objective, the present invention provides a bicycle repair stand adjustable in height, which includes a lower support, a first rotating set, a second rotating set, and an upper support. The lower support has a first pivot portion and a second pivot portion. The first rotating set has a third pivot portion and a first gear. The third pivot portion is pivotably connected with the first pivot portion. The first gear rotates along with the third pivot portion. The second rotating set has a fourth pivot portion, a second gear and a third gear. The fourth pivot portion is pivotably connected with the second pivot portion. The second gear is rotated by the first gear. The third gear and the second gear rotate coaxially and synchronously. The axes of the first gear and the second gear are perpendicular to each other. The upper support has a gear rack. The gear rack is engaged with the third gear, and the rotation of the third gear drives the upper support to ascend and descend relative to the lower support.

[0005] The axes of the first gear and the second gear being perpendicular to each other makes the gear rack uneasy to rotate the gears, so as to attain to simplified structure and avoid descending due to a heavy load.

[0006] Preferably, the first rotating set has a first rotating member. The third pivot portion and the first gear are located on the first rotating member.

[0007] Preferably, the second rotating set has a second rotating member. The fourth pivot portion and the second gear are located on the second rotating member.

[0008] Preferably, the second rotating set has a third rotating member disposed on the second rotating member. The third gear is located on the third rotating member.

[0009] Preferably, the lower support includes a first gear seat and a second gear seat combined with the first gear seat. The first rotating set and the second rotating set are disposed between the first gear seat and the second gear seat.

[0010] Preferably, the second pivot portion is formed by the first gear seat and the second gear seat collectively.

[0011] Preferably, the lower support has a first abutted portion, and a sleeve is disposed between the first gear and the first abutted portion.

[0012] Preferably, the lower support has a second abutted portion, and a sleeve is disposed between the third gear and the second abutted portion.

[0013] Preferably, the fourth pivot portion is a pivot rod. The third gear has a fastening hole combined with the fourth pivot portion.

[0014] To attain the above objective, the present invention provides another bicycle repair stand adjustable in height, which includes a lower support, a first rotating set, a second rotating set, and an upper support. The lower support has a first pivot portion and a second pivot portion. The first rotating set has a third pivot portion and a first gear. The third pivot portion is pivotably connected with the first pivot portion. The first gear rotates along with the third pivot portion. The second rotating set has a fourth pivot portion and a second gear. The fourth pivot portion is pivotably connected with the second pivot portion. The second gear is rotated by the first gear. The axes of the first gear and the second gear are perpendicular to each other. The upper support has a gear rack. The gear rack is engaged with the second gear, and the rotation of the second gear drives the upper support to ascend and descend relative to the lower support.

[0015] The axes of the first gear and the second gear being perpendicular to each other makes the gear rack uneasy to rotate the gears, so as to attain to simplified structure and avoid descending due to a heavy load.

[0016] Preferably, the first rotating set has a first rotating member. The third pivot portion and the first gear are located on the first rotating member.

[0017] Preferably, the second rotating set has a second rotating member. The fourth pivot portion and the second gear are located on the second rotating member.

[0018] Preferably, the lower support includes a first gear seat and a second gear seat combined with the first gear seat. The first rotating set and the second rotating set are disposed between the first gear seat and the second gear seat.

[0019] Preferably, the first pivot portion is located on the first gear seat, and the second pivot portion is located on the first gear seat.

[0020] Preferably, the lower support has a first abutted portion, and a sleeve is disposed between the first gear and the first abutted portion.

[0021] Preferably, the lower support has a second abutted portion, and a sleeve is disposed between the second gear and the second abutted portion.

[0022] Preferably, a pivot member makes the second pivot portion and the fourth pivot portion pivotably connected with each other.

[0023] Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The bicycle repair stand of the present invention will become more fully understood from the detailed description given herein below and the accompanying drawings, and wherein: FIG. 1 is an assembled perspective view of a preferred embodiment of the present invention; FIG. 2 is an assembled sectional view of a part of the preferred embodiment of the present invention; FIG. 3 is a perspective view of a first gear seat of the preferred embodiment of the present invention from a direction; FIG. 4 is a perspective view of the first gear seat of the preferred embodiment of the present invention from another direction; FIG. 5 is a perspective view of a second gear seat of the preferred embodiment of the present invention; FIG. 6 is an exploded perspective view of a first rotating set of the preferred embodiment of the present invention; FIG. 7 is an exploded perspective view of a second rotating set of the preferred embodiment of the present invention; FIG. 8 is an assembled perspective view of another preferred embodiment of the present invention; FIG. 9 is an assembled sectional view of a part of the aforementioned another preferred embodiment of the present invention; FIG. 10 is a perspective view of a first gear seat of the aforementioned another preferred embodiment of the present invention from a direction; FIG. 11 is a perspective view of the first gear seat of the aforementioned another preferred embodiment of the present invention from another direction; FIG. 12 is a perspective view of a second gear seat of the aforementioned another preferred embodiment of the present invention; and FIG. 13 is an exploded perspective view of a part of the aforementioned another preferred embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0025] First of all, it is to be mentioned that the technical features provided by the present invention are unlimited to the specific structure, usage and application thereof described in the detailed description of the invention. It should be understood by those skilled in the related art that all the terms used in the contents of the specification are for illustrative description. The directional terms mentioned in the specification, such as 'front', 'upper', 'lower', 'rear', 'left', 'right', 'top', 'bottom', `inside', and 'outside', are also just for illustrative description on the basis of normal usage direction, not intended to limit the claimed scope.

[0026] Referring to FIG. 1 to FIG. 7, a bicycle repair stand according to a preferred embodiment of the present invention includes a lower support 1, a first rotating set 4, a second rotating set 5, and an upper support 7.

[0027] The lower support 1 includes a rack body 10, a first gear seat 20, and a second gear seat 30.

[0028] The rack body 10 is provided for supporting on the ground.

[0029] The first gear seat 20 has a lower sleeving hole 21, an upper sleeving hole 22, a first pivot portion P1, two second pivot portions P2, and two second abutted portions B2. The lower sleeving hole 21 is connected with the rack body 10. The upper sleeving hole 22 communicates with the lower sleeving hole 21. The first pivot portion P1 is a pivot hole in this embodiment. The two second pivot portions P2 are each a half of a pivot hole in this embodiment. The first pivot portion P1 is perpendicular to the two second pivot portions P2. The two second abutted portions B2 are located around the second pivot portions P2 respectively.

[0030] The second gear seat 30 has a first pivot portion P1, two second pivot portions P2, and a first abutted portion B1. The first pivot portion P1 is a pivot hole in this embodiment. The two second pivot portions P2 are each a half of a pivot hole in this embodiment. The first abutted portion B1 is located around the first pivot portion P1. The first pivot portion P1 of the second gear seat 30 is coaxial with the first pivot portion P1 of the first gear seat 20. The second pivot portions P2 of the second gear seat 30 are coaxial with the second pivot portions P2 of the first gear seat 20 respectively to form a pivot hole collectively.

[0031] In other words, the second pivot portion P2 is formed by the first gear seat 20 and the second gear seat 30 collectively in this embodiment, but the present invention is unlimited thereto.

[0032] The first rotating set 4 has a first rotating member 40.

[0033] The first rotating member 40 is disposed on the rack body 10 capably of being rotated, and pivotably connected with the first pivot portion P1. The first rotating member 40 has two third pivot portions P3, a first gear 41, and a rotation driving portion 42. In this embodiment, the two third pivot portions P3 are pivot rods axially connected to two ends of the first gear 41 respectively. The two third pivot portions P3 are pivotably connected with the first pivot portion P1 of the first gear seat 20 and the first pivot portion P1 of the second gear seat 30 respectively. The first gear 41 is a crown gear. The rotation driving portion 42 is configured for a tool to rotate the first rotating member 40.

[0034] A sleeve W is disposed between the first gear 41 and the first abutted portion B1.

[0035] The second rotating set 5 has a second rotating member 50 and a third rotating member 60. The second rotating set 5 is rotatably disposed on the rack body 10, and pivotably connected with the second pivot portion P2. The first rotating set 4 drives the second rotating set 5 to rotate.

[0036] The second rotating member 50 has a fourth pivot portion P4 and a second gear 51. In this embodiment, the fourth pivot portion P4 is a pivot rod axially connected to an end of the second gear 51. The fourth pivot portion P4 is pivotably connected with the two second pivot portions P2 of the first gear seat 20 and the two second pivot portions P2 of the second gear seat 30. The second gear 51 is a crown gear engaged with the first gear 41.

[0037] The third rotating member 60 has a third gear 61 fixedly sleeved onto the fourth pivot portion P4 by a fastening hole 62 and rotating coaxially and synchronously with the second gear 51. The third gear 61 is a helical gear.

[0038] In this embodiment, two sleeves W are sleeved onto the fourth pivot portion P4. One of the sleeves W is located between the third gear 61 and one of the second abutted portions B2. The other sleeve W is located between the third gear 61 and the other second abutted portion B2 and pivotably connected with one of the second pivot portions P2.

[0039] The upper support 7 has a lifting rod 70 and a bicycle carrying set 80.

[0040] The lifting rod 70 is axially movably inserted in the lower sleeving hole 21 and the upper sleeving hole 22 of the first gear seat 20. The lifting rod 70 has a rod member 71 and a plurality of teeth 72 connected with the rod member 71 continuously. The plurality of teeth 72 form a gear rack 73. The gear rack 73 is engaged with the third gear 61. The gear rack 73 is driven by the rotation of the third gear 61 so that the upper support 7 ascends and descends relative to the lower support 1.

[0041] The bicycle carrying set 80 is disposed on the lifting rod 70 for carrying a bicycle.

[0042] The members and structure of the bicycle repair stand of the present invention are described above. The usage manner of the bicycle repair stand of the present invention will be further introduced hereinafter. The first rotating set 4 is rotated to make the first gear 41 thereof rotate the second gear 51 of the second rotating set 5. The third gear 61 and the second gear 51 rotate synchronously. The rotation of the third gear 61 drives the gear rack 73 of the lifting rod 70 to displace upwardly and downwardly. The upward and downward displacement of the gear rack 73 makes the upper support 7 ascend and descend.

[0043] The axes of the first gear 41 and the second gear 51 being perpendicular to each other makes the gear rack 73 uneasy to reversely drive the first gear 41, the second gear 51 and the third gear 61 to rotate, thereby attaining the effect of using simplified structure to avoid improper descending due to a heavy load. The third gear 61 being a helical gear can further improve the attainment of this effect.

[0044] Referring to FIG. 8 to FIG. 13, a bicycle repair stand according to another preferred embodiment of the present invention includes a lower support 1, a first rotating set 4, a second rotating set 5, and an upper support 7.

[0045] The lower support 1 includes a rack body 10, a first gear seat 20, and a second gear seat 30.

[0046] The rack body 10 is provided for supporting on the ground.

[0047] The first gear seat 20 has a lower sleeving hole 21, an upper sleeving hole 22, a first pivot portion P1, two second pivot portions P2, a first abutted portion B1, and two second abutted portions B2. The lower sleeving hole 21 is connected with the rack body 10. The upper sleeving hole 22 communicates with the lower sleeving hole 21. The first pivot portion P1 is a pivot rod in this embodiment. The two second pivot portions P2 are pivot holes in this embodiment. The two second abutted portions B2 are located around the second pivot portions P2.

[0048] The second gear seat 30 has a first pivot portion P1 and a first abutted portion B1. The first pivot portion P1 of the second gear seat 30 is coaxial with the first pivot portion P1 of the first gear seat 20. The first pivot portion P1 of the second gear seat 30 is a hole in this embodiment, which is not pivotably connected with the first rotating set 4 in this embodiment, but can be modified to become pivotably connected with the first rotating set 4.

[0049] The first rotating set 4 has a first rotating member 40.

[0050] The first rotating member 40 is disposed on the rack body 10 capably of being rotated, and pivotably connected with the first pivot portion P1. The first rotating member 40 has a third pivot portion P3, a first gear 41, and a rotation driving portion 42. The third pivot portion P3 is pivotably connected with the first pivot portion P1 of the first gear seat 20. The first gear 41 is a helical gear. One side of the first gear 41 may be abutted on the first abutted portion B1 of the first gear seat 20 or not. Alternatively, a sleeve W may be disposed between the first gear 41 and the first abutted portion B1. The rotation driving portion 42 is configured for a tool to rotate the first rotating member 40.

[0051] The second rotating set 5 is rotatably disposed on the rack body 10, and pivotably connected with the second pivot portion P2. The first rotating set 4 drives the second rotating set 5 to rotate. The second rotating set 5 has a second rotating member 50.

[0052] The second rotating member 50 has a fourth pivot portion P4 and a second gear 51. The fourth pivot portion P4 is a pivot hole, and pivotably connected with the second pivot portion P2 of the first gear seat 20 by a pivot member S1. In other words, a pivot member S1 makes the second pivot portion P2 of the lower support 1 and the fourth pivot portion P4 of the second rotating set 5 pivotably connected with each other. The second gear 51 rotates around the fourth pivot portion P4. The second gear 51 is rotated by the first gear 41. Two sides of the second gear 51 may be abutted on the two second abutted portions B2 of the first gear seat 20. Alternatively, a sleeve W may be disposed between the second gear 51 and the second abutted portion B2.

[0053] The upper support 7 has a lifting rod 70 and a bicycle carrying set 80.

[0054] The lifting rod 70 is axially movably inserted in the lower sleeving hole 21 and the upper sleeving hole 22 of the first gear seat 20. The lifting rod 70 has a rod member 71 formed with a gear rack 73. The gear rack 73 is engaged with the second gear 51. The gear rack 73 is driven by the rotation of the second gear 51 so that the upper support 7 ascends and descends relative to the lower support 1.

[0055] The bicycle carrying set 80 is disposed on the lifting rod 70 for carrying a bicycle.

[0056] The members and structure of the bicycle repair stand of the present invention are described above. The usage manner of the bicycle repair stand of the present invention will be further introduced hereinafter. The first rotating set 4 is rotated to make the first gear 41 thereof rotate the second gear 51 of the second rotating set 5. The rotation of the second gear 51 drives the gear rack 73 of the lifting rod 70 to displace upwardly and downwardly. The upward and downward displacement of the gear rack 73 makes the upper support 7 ascend and descend.

[0057] The axes of the first gear 41 and the second gear 51 being perpendicular to each other makes the gear rack 73 uneasy to reversely drive the first gear 41 and the second gear 51 to rotate, thereby attaining the effect of using simplified structure to avoid improper descending due to a heavy load. The first gear 41 being a helical gear can further improve the attainment of this effect.

Claims

1. A bicycle repair stand adjustable in height, the bicycle repair stand being characterized in comprising: a lower support (1) having a first pivot portion (P1) and a second pivot portion (P2); a first rotating set (4) having a third pivot portion (P3) and a first gear (41), the third pivot portion (P3) being pivotably connected with the first pivot portion (P1), the first gear (41) rotating along with the third pivot portion (P3); a second rotating set (5) having a fourth pivot portion (P4), a second gear (51) and a third gear (61), the fourth pivot portion (P4) being pivotably connected with the second pivot portion (P2), the second gear (51) being rotated by the first gear (41), the third gear (61) and the second gear (51) rotating coaxially and synchronously, axes of the first gear (41) and the second gear (51) being perpendicular to each other; and an upper support (7) having a gear rack (73), the gear rack (73) being engaged with the third gear (61) and rotation of the third gear (61) driving the upper support (7) to ascend and descend relative to the lower support (1).

2. The bicycle repair stand as claimed in claim 1, which is characterized in that the first rotating set (4) has a first rotating member (40); the third pivot portion (P3) and the first gear (41) are located on the first rotating member (40).

3. The bicycle repair stand as claimed in claim 1 or 2, which is characterized in that the second rotating set (5) has a second rotating member (50); the fourth pivot portion (P4) and the second gear (51) are located on the second rotating member (50).

4. The bicycle repair stand as claimed in claim 3, which is characterized in that the second rotating set (5) has a third rotating member (60) disposed on the second rotating member (50); the third gear (61) is located on the third rotating member (60).

5. The bicycle repair stand as claimed in claim 1 or 2, which is characterized in that the lower support (1) comprises a first gear seat (20) and a second gear seat (30) combined with the first gear seat (20); the first rotating set (4) and the second rotating set (5) are disposed between the first gear seat (20) and the second gear seat (30).

6. The bicycle repair stand as claimed in claim 5, which is characterized in that the second pivot portion (P2) is formed by the first gear seat (20) and the second gear seat (30) collectively.

7. The bicycle repair stand as claimed in claim 1 or 2, which is characterized in that the lower support (1) has a first abutted portion (B1); a sleeve (W) is disposed between the first gear (41) and the first abutted portion (B1).

8. The bicycle repair stand as claimed in claim 1 or 2, which is characterized in that the lower support (1) has a second abutted portion (B2); a sleeve (W) is disposed between the third gear (61) and the second abutted portion (B2).

9. The bicycle repair stand as claimed in claim 1 or 2, which is characterized in that the fourth pivot portion (P4) is a pivot rod; the third gear (61) has a fastening hole (62) combined with the fourth pivot portion (P4).

10. A bicycle repair stand adjustable in height, the bicycle repair stand being characterized in comprising: a lower support (1) having a first pivot portion (P1) and a second pivot portion (P2); a first rotating set (4) having a third pivot portion (P3) and a first gear (41), the third pivot portion (P3) being pivotably connected with the first pivot portion (P1), the first gear (41) rotating along with the third pivot portion (P3); a second rotating set (5) having a fourth pivot portion (P4) and a second gear (51), the fourth pivot portion (P4) being pivotably connected with the second pivot portion (P2), the second gear (51) being rotated by the first gear (41), axes of the first gear (41) and the second gear (51) being perpendicular to each other; and an upper support (7) having a gear rack (73), the gear rack (73) being engaged with the second gear (51) and rotation of the second gear (51) driving the upper support (7) to ascend and descend relative to the lower support (1).

11. The bicycle repair stand as claimed in claim 10, which is characterized in that the first rotating set (4) has a first rotating member (40); the third pivot portion (P3) and the first gear (41) are located on the first rotating member (40).

12. The bicycle repair stand as claimed in claim 10 or 11, which is characterized in that the second rotating set (5) has a second rotating member (50); the fourth pivot portion (P4) and the second gear (51) are located on the second rotating member (50).

13. The bicycle repair stand as claimed in claim 10 or 11, which is characterized in that the lower support (1) comprises a first gear seat (20) and a second gear seat (30) combined with the first gear seat (20); the first rotating set (4) and the second rotating set (5) are disposed between the first gear seat (20) and the second gear seat (30).

14. The bicycle repair stand as claimed in claim 13, which is characterized in that the first pivot portion (P1) is located on the first gear seat (20); the second pivot portion (P2) is located on the first gear seat (20).

15. The bicycle repair stand as claimed in claim 10 or 11, which is characterized in that the lower support (1) has a first abutted portion (B1); a sleeve (W) is disposed between the first gear (41) and the first abutted portion (B1); or which is characterized in that the lower support (1) has a second abutted portion (B2); a sleeve (W) is disposed between the second gear (51) and the second abutted portion (B2); or which is characterized in that a pivot member (S1) makes the second pivot portion (P2) and the fourth pivot portion (P4) pivotably connected with each other.

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