CN214597128U

CN214597128U - Tennis training aid with elastic rope not winding vertical rod

Info

Publication number: CN214597128U
Application number: CN202023126549.5U
Authority: CN
Inventors: 王志明; 王亮
Original assignee: Huainan Normal University
Current assignee: Huainan Normal University
Priority date: 2020-12-22
Filing date: 2020-12-22
Publication date: 2021-11-05
Anticipated expiration: 2030-12-22

Abstract

The utility model belongs to the tennis field specifically discloses a tennis training aid of stretch cord antiwind pole setting, including base, pole setting, stretch cord and tennis. The lower end of the vertical rod is provided with a convex part and a shaft part in sequence. The middle part of the base fixed part of the base is provided with a vertically arranged shaft through hole, the upper end part is provided with a 1 st bearing caulking groove and a 2 nd bearing caulking groove, and the lower end part is provided with a 3 rd bearing caulking groove. The diameter of the 1 st bearing insert groove is larger than that of the 2 nd bearing insert groove. The 1 st bearing caulking groove is internally provided with a 1 st bearing, the 2 nd bearing caulking groove is internally provided with a 2 nd bearing, and the 3 rd bearing caulking groove is internally provided with a 3 rd bearing. The shaft part of the upright rod 2 sequentially passes through the 1 st bearing, the 2 nd bearing and the 3 rd bearing, and a bearing cover is fixed at the lower end of the base fixing part. The No. 1 bearing is a thrust bearing and is attached to the boss. One end of the elastic rope is connected with the rope threading hole at the top end of the upright stanchion, and the other end is connected with the tennis ball. The upright stanchion is connected with the base through a bearing, and rotates relative to the base, so that the elastic rope is prevented from being wound on the upright stanchion.

Description

Tennis training aid with elastic rope not winding vertical rod

Technical Field

The utility model relates to a tennis training aid device especially relates to a tennis training aid device of stretch cord non-winding pole setting, belongs to the sport equipment field.

Background

The primary trainees usually practice by using the tennis practice device, tennis balls, the elastic ropes and the fixed seat are sequentially connected, even though no tennis fence exists, the training effect is improved without picking up the tennis balls everywhere, but the conventional tennis practice device is easy to cause the elastic ropes to be wound on the upright posts on the fixed seat, so that the elastic ropes are gradually shortened, and the hitting practice effect is influenced. For example, chinese patent application publication No. CN105214295A entitled tennis training device discloses a scheme in which tennis balls, elastic strings, and top ends of uprights are sequentially connected, and a tension sensor is disposed, the lower ends of the uprights are fixed to a fixing device, the fixing device is relatively stationary with respect to the ground, and during practice of tennis balls, tennis balls randomly move in various directions, and the elastic strings are likely to surround the uprights and wind around the uprights, so that the elastic strings are gradually shortened, thereby affecting the practice effect of hitting balls.

Disclosure of Invention

To the problem that exists among the prior art, the utility model provides a tennis training aid of stretch cord non-winding pole setting, through the bearing connection between the lower tip of pole setting and base, the relative base of pole setting rotates, effectively avoids the stretch cord to encircle on the stand.

The technical proposal of the utility model provides a tennis training aid with elastic ropes not wound around a vertical rod, which comprises a base 1, a vertical rod 2, a rope through hole 3, an elastic rope 4 and a tennis ball 5; the rope threading hole 3 is arranged at the top end of the upright stanchion 2; the lower end part of the upright rod 2 is provided with a convex part 21 and a shaft part 22 from top to bottom in sequence; the middle part of the base 1 is provided with a base fixing part 11; the middle part of the base fixing part 11 is provided with a shaft through hole arranged along the up-down direction, the upper end part is provided with a 1 st bearing embedded groove 12 and a 2 nd bearing embedded groove 13 arranged along the horizontal direction, and the lower end part is provided with a 3 rd bearing embedded groove 14 arranged along the horizontal direction; the diameter of the 1 st bearing insert groove 12 is larger than that of the 2 nd bearing insert groove 13; the 1 st bearing caulking groove 12 is internally provided with a 1 st bearing 16, the 2 nd bearing caulking groove 13 is internally provided with a 2 nd bearing 17, the 3 rd bearing caulking groove 14 is internally provided with a 3 rd bearing 18, and a shaft part 22 at the lower end part of the vertical rod 2 sequentially passes through the 1 st bearing 16, the 2 nd bearing 17 and the 3 rd bearing 18; a bearing cover 15 is fixed at the lower end of the base fixing part 11; the 1 st bearing is a thrust bearing, the lower end surface of the boss 21, the 1 st bearing and the bottom end surface of the 1 st bearing caulking groove 12 are sequentially attached, and the bearing is suitable for bearing the weight of the vertical rod 2; one end of the elastic rope 4 is fixedly connected with the rope through hole 3, and the other end is fixedly connected with the tennis ball 5.

In the implementation and application process, the utility model also has the following further optional technical scheme.

Alternatively, the 1 st, 2 nd, 3 rd bearing

insertion grooves

12, 13, 14 and the shaft through holes of the base fixing portion 11 are coaxially fitted.

Alternatively, the 2 nd bearing 17 and the shaft portion 22 are in interference fit, and the 3 rd bearing 18 and the shaft portion 22 are in interference fit.

Optionally, the rope threading hole 3 is a fixing lug in an inverted U shape, and the lower end of the rope threading hole 3 is fixed to the top end of the upright rod 2.

Optionally, the rope threading hole 3 protrudes from the outer convex surface of the top end of the vertical rod 2, and the distance between the rope threading hole 3 and the outer convex surface of the top end of the vertical rod 2 is more than 2 cm.

Alternatively, the bearing cap 15 and the lower end portion of the base fixing portion 11 are fixed by bolts.

Optionally, the base 1 further includes a base body, the base body and the base fixing portion 11 are welded and fixed, and the base fixing portion 11 is located in the middle of the base body; the upper end of the base fixing part 11 protrudes from the upper surface of the base body.

Compared with the prior art, the beneficial effects of the utility model are that: the tennis ball, the elastic rope and the upper end part of the upright rod are fixed in sequence, the lower end part of the upright rod is fixedly connected with the base through a bearing, and the upright rod is matched with the base in a rotating mode. When the tennis ball is hit again, under the action of the hitting force, the tennis ball flies out, drives the elastic rope to stretch, and gives a stretching force, the stretching force acts on the vertical rod through the elastic rope to generate a torque, and the vertical rod is forced to rotate relative to the base, so that the elastic rope is prevented from being wound on the vertical rod, and the effect of no winding is achieved.

Drawings

Fig. 1 is a schematic view of a tennis training aid with elastic ropes not wound around a vertical rod.

Fig. 2 is an exploded view of the assembly of the upright and the base in fig. 1.

The tennis ball bearing comprises a base 1, a base 11, a base fixing part 12, a bearing caulking groove 1, a bearing caulking groove 2, a bearing caulking groove 3, a bearing cover 15, a bearing 1, a bearing 2, a bearing 3, a vertical rod 2, a bulge 21, a shaft part 22, a rope threading hole 3, an elastic rope 4 and a tennis ball 5.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments.

As an embodiment of the present invention, there is provided a tennis training aid in which a vertical rod is not wound by elastic strings, as shown in fig. 1 to 2, the tennis training aid includes a base 1, a vertical rod 2, a string hole 3, an elastic string 4, and a tennis ball 5. The rope threading hole 3 is arranged at the top end of the upright stanchion 2; further, the rope threading hole 3 is a fixing lug in an inverted U shape, and the lower end of the rope threading hole 3 is fixedly connected with the top end of the upright rod 2, for example, welded and fixed. The upright stanchion 2 is vertically arranged, and the lower end part of the upright stanchion 2 is provided with a convex part 21 and a shaft part 22 from top to bottom in sequence; the shaft portion 22 is located below the boss portion 21. The boss 21 is a projection that surrounds the outer surface of the pole 2 for one circle, and the outer diameter of the boss 21 is larger than the diameter of the shaft 22. The boss portion 21 is fitted to the shaft portion 22. The base 1 is horizontally arranged along the horizontal plane direction, and the middle part of the base 1 is provided with a base fixing part 11. The middle part of the base fixing part 11 is provided with a shaft through hole arranged along the up-down direction, the upper end part is provided with a 1 st bearing embedded groove 12 and a 2 nd bearing embedded groove 13 arranged along the horizontal direction, and the lower end part is provided with a 3 rd bearing embedded groove 14 arranged along the horizontal direction; as shown in fig. 2, the shaft through hole penetrates the base fixing portion 11. The diameter of the 1 st bearing insert groove 12 is larger than the diameter of the 2 nd bearing insert groove 13. The 1 st bearing insert groove 12 is provided with a 1 st bearing 16, the 2 nd bearing insert groove 13 is provided with a 2 nd bearing 17, and the 3 rd bearing insert groove 14 is provided with a 3 rd bearing 18. The shaft 22 at the lower end of the vertical rod 2 passes through the 1 st bearing 16, the 2 nd bearing 17 and the 3 rd bearing 18 in this order, i.e., passes through the shaft through hole of the base fixing portion 11. A bearing cover 15 is fixed at the lower end of the base fixing part 11; alternatively, the bearing cap 15 and the lower end portion of the base fixing portion 11 are fixed by bolts. The bearing 1 is a thrust bearing, is suitable for bearing the weight of the vertical rod 2, replaces sliding fit, reduces the friction force between the vertical rod 2 and the base 1, and further reduces the probability of winding the elastic rope 4 on the surface of the vertical rod 2. The lower end face of the boss 21, the 1 st bearing and the bottom end face of the 1 st bearing caulking groove 12 are sequentially attached to each other, and are suitable for bearing the weight of the vertical rod 2. One end of the elastic rope 4 is fixedly connected with the rope through hole 3, and the other end is fixedly connected with the tennis ball 5.

Wherein, the rope threading hole 3 protrudes out of the convex surface at the top end of the upright stanchion 2, and the distance between the rope threading hole 3 and the convex surface at the top end of the upright stanchion 2 is more than 2 cm; the elastic rope 4 and the rope threading hole 3 are convenient to be fixedly connected. The convex surface at the top end of the upright 2 advantageously inhibits the bungee cord 4 from wrapping around the surface of the upright 2.

The shaft through holes of the 1 st bearing caulking groove 12, the 2 nd bearing caulking groove 13, the 3 rd bearing caulking groove 14 and the base fixing part 11 are coaxially matched, so that the assembly difficulty is further reduced, the friction force of the vertical rod 2 rotating relative to the base 1 is reduced, and the probability of winding the elastic rope 4 on the surface of the vertical rod 2 is reduced.

Wherein, 2 nd bearing 17 and axial region 22 interference fit, 3 rd bearing 18 and axial region 22 interference fit to make pole setting 2 and base 1 connect and form an organic whole, be difficult for droing.

The base 1 further comprises a base body, the base body is welded and fixed with the base fixing part 11, and the base fixing part 11 is located in the middle of the base body; the upper end of the base fixing part 11 protrudes from the upper surface of the base body.

The working principle of the tennis training aid is as follows: the tennis training aid is placed on the ground, a student holds and throws a tennis, holds a racket with the other hand to hit the tennis, one hitting training is completed, the tennis moves upwards to drive the elastic rope to stretch, the tennis rebounds under the action of energy stored by the elastic rope, the student hits the tennis again to achieve the next hitting training, and the operation is carried out to repeat the hitting training. When the tennis ball is hit again, under the action of the hitting force, the tennis ball flies out, drives the elastic rope to stretch, and gives a stretching force, the stretching force acts on the vertical rod through the elastic rope to generate a torque, and the vertical rod is forced to rotate relative to the base, so that the effect of no winding is achieved.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration only, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims, specification and equivalents thereof.

Claims

1. A tennis training aid with elastic ropes not wound around vertical rods comprises a base (1), vertical rods (2), rope threading holes (3), elastic ropes (4) and tennis balls (5); the rope threading hole (3) is arranged at the top end of the upright rod (2); the lower end part of the upright rod (2) is sequentially provided with a convex part (21) and a shaft part (22) from top to bottom; the middle part of the base (1) is provided with a base fixing part (11); the middle part of the base fixing part (11) is provided with a shaft through hole arranged along the vertical direction, the upper end part is provided with a 1 st bearing embedded groove (12) and a 2 nd bearing embedded groove (13) arranged along the horizontal direction, and the lower end part is provided with a 3 rd bearing embedded groove (14) arranged along the horizontal direction; the diameter of the 1 st bearing caulking groove (12) is larger than that of the 2 nd bearing caulking groove (13); a 1 st bearing (16) is arranged in the 1 st bearing caulking groove (12), a 2 nd bearing (17) is arranged in the 2 nd bearing caulking groove (13), a 3 rd bearing (18) is arranged in the 3 rd bearing caulking groove (14), and a shaft part (22) at the lower end part of the vertical rod (2) sequentially passes through the 1 st bearing (16), the 2 nd bearing (17) and the 3 rd bearing (18); a bearing cover (15) is fixed at the lower end of the base fixing part (11); the 1 st bearing is a thrust bearing, the lower end surface of the boss (21), the 1 st bearing and the bottom end surface of the 1 st bearing caulking groove (12) are sequentially attached, and the bearing is suitable for bearing the weight of the vertical rod (2); one end of the elastic rope (4) is fixedly connected with the rope through hole (3), and the other end is fixedly connected with the tennis ball (5).

2. The tennis training aid of claim 1, wherein the bungee cord is not wrapped around the vertical pole, and wherein: the shaft through holes of the 1 st bearing caulking groove (12), the 2 nd bearing caulking groove (13), the 3 rd bearing caulking groove (14) and the base fixing part (11) are coaxially matched.

3. The tennis training aid of claim 1, wherein the bungee cord is not wrapped around the vertical pole, and wherein: the 2 nd bearing (17) is in interference fit with the shaft part (22), and the 3 rd bearing (18) is in interference fit with the shaft part (22).

4. The tennis training aid of claim 1, wherein the bungee cord is not wrapped around the vertical pole, and wherein: the rope threading hole (3) is a fixing lug in an inverted U shape, and the lower end of the rope threading hole (3) is fixed with the top end of the upright rod (2).

5. The tennis training aid of claim 4, wherein the bungee cord is not wrapped around the vertical pole, and wherein: the rope threading hole (3) protrudes out of the convex surface at the top end of the vertical rod (2), and the distance between the rope threading hole (3) and the convex surface at the top end of the vertical rod (2) is larger than 2 cm.

6. The tennis training aid of claim 1, wherein the bungee cord is not wrapped around the vertical pole, and wherein: and the bearing cover (15) and the lower end part of the base fixing part (11) are fixed by bolts.

7. The tennis training aid of any one of claims 1-6, wherein the bungee cord is not wrapped around the vertical post: the base (1) further comprises a base body, the base body and a base fixing part (11) are welded and fixed, and the base fixing part (11) is located in the middle of the base body; the upper end of the base fixing part (11) protrudes out of the upper surface of the base body.