CN101623552B

CN101623552B - Constant-force drop rope device overhead table tennis net

Info

Publication number: CN101623552B
Application number: CN2009100750806A
Authority: CN
Inventors: 左洪志; 左维; 张兴海; 刘念禹
Original assignee: Yanshan University
Current assignee: Yanshan University
Priority date: 2009-08-05
Filing date: 2009-08-05
Publication date: 2012-06-27
Anticipated expiration: 2029-08-05
Also published as: CN101623552A

Abstract

The invention belongs to the field of sports apparatuses, more particularly relates to a constant-force drop rope device overhead a table tennis net. The device mainly comprises a flat-square net post (6), a concave pulley (18), a drop rope (3) and a heavy block (16), wherein the pull force and the bound force which are suffered by the drop rope (3) are constant when the left end of the drop rope (3) is fixed and moves around the concave pulley (18) and the right end of the drop rope (3) is tied on a hook ring (15) of the heavy block (16). The constant-force drop rope device can effectively avoid the defects that the bound forces when a table tennis ball touches the same position of each overhead upper edge (11) by using the same force are different as the outward pull force and the bound force of a net bag (10) and a suspension net rope (2) on the prior table tennis net device are not stable.

Description

Constant-force drop rope device overhead table tennis net

Technical field

The invention belongs to field of sports equipment, particularly a kind of constant-force drop rope device overhead table tennis net that is used for.

Technical background

At present, the tennis competition rule has following regulation about the table tennis net device: " net assembly comprises net, hanging net rope, net post and they is fixed on the clamp part on the billiard table; Net should be suspended on the rope, and the rope two ends tie up on the high 15.25 centimetres upright net post, and the distance that the net post outer rim is left the sideline outer rim is 15.25 centimetres; The top of whole net is apart from 15.25 centimetres of playing surface; The base of the whole net playing surface of should trying one's best, its two ends net post of should trying one's best ".

When three places " 15.25 centimetres " according to the tennis competition rule predetermining require net is installed; Because rule is not to hanging net rope and be wrapped in the outer last mesh bag of hanging net rope and be pulled outwardly power and make concrete regulation; Existing table tennis net device is not controlled the hanging net rope again and is gone up the device that mesh bag is pulled outwardly power, and this can form each billiard table hanging net rope and go up the difference that mesh bag is pulled outwardly power and bounce.Under above-mentioned state; When identical power table tennis touches on each upper edge, mesh bag top same position; It is different that the table tennis bounce-back changes, and this is unfavorable for that the sportsman judges assurance table tennis net bounce-back Changing Pattern, answers fair principle to have gap with the athletic competition condition.

Summary of the invention

In order to address the above problem, the present invention proposes a kind of constant-force drop rope device overhead table tennis net, and this apparatus structure is simple, can effectively avoid the existing different bounces that go up upper edge, mesh bag top and cause the table tennis bounce-back to be the drawback that non-regularity changes.

The technical scheme that the present invention adopted is: a kind of constant-force drop rope device overhead table tennis net; The left and right sides at table tennis table is provided with clamp respectively, and the deltiod net post is set above the outer end of clamp, and the side mesh bag that is with round bar is installed in the said deltiod net post; The hanging net rope is set in the mesh bag on net; Both sides, deltiod net post top are provided with gag lever post and penetrating axial trough respectively, through screw the spill pulley are installed in the said penetrating axial trough, on the said spill pulley axle sleeve are set; The lower surface of riveting the clamp on tether bar, right side in the outer face of the clamp that is positioned at the table tennis table left side is fixedly connected folder hanging net rope spring leaf through screw; Be the hanging net rope to be arranged and weigh down rope on the said rope bar; The outside that the other end of said bob rope is walked around said spill pulley is connected with pouring weight through shackle, and the outside that the other end of said hanging net rope is walked around said gag lever post is connected with folder hanging net rope spring leaf.

As a kind of optimal way of the present invention, between said hanging net rope gag lever post and the deltiod net post through being threaded.

This constant-force drop rope device overhead table tennis net, three places " 15.25 centimetres " requirement of monnolithic case size conforms tennis competition rule predetermining.On left and right clamp outer end, vertically connect left and right deltiod net post respectively; Both sides process the penetrating axial trough that goes out respectively above left and right deltiod net post; Each installation shaft is placed on the axial troughs inboard in left and right spill pulley, by the screw connection that is fixed.The hanging net gag lever post of restricting is threaded with left and right deltiod net post respectively; The riveted joint tether bar in left clamp outer face is fixedly connected folder hanging net rope spring leaf in right clamp lower surface by screw.The left end of hanging net rope, bob rope is tied up on the tether bar; The hanging net rope is walked around above the gag lever post, and right-hand member ties up in the folder hanging net rope spring leaf, and net is opened; Weigh down rope and walk around above two spill pulleys, right-hand member ties up on the pouring weight shackle.Pouring weight makes the bob rope be in stretching state in upper edge, net top to weighing down the identical pulling force of rope, and its bounce keeps steady state.

The invention has the beneficial effects as follows: when a plurality of billiard tables all adopt the stressed tractive of pouring weight of same weight to weigh down rope separately; When each weighs down rope to receive pulling force is identical; It is identical that identical power table tennis touches its bounce-back variation of bob rope same position; It is uncertain that this can effectively avoid on the existing net assembly mesh bag and the hanging net outside pulling force of restricting; Level of tightness there are differences, and identical power table tennis is touched net and pushed up the different drawback of upper edge same position bounce-back, helps the sportsman and judges assurance table tennis net bounce-back Changing Pattern.The constant-force drop rope device overhead table tennis net of the present invention's design is realized the athletic competition condition for this field and is answered the requirement of fairness to have practical significance.

Description of drawings

Below in conjunction with the accompanying drawing and the specific embodiment the utility model is done explanation in further detail.

Fig. 1 is the front view of constant-force drop rope device overhead table tennis net;

Fig. 2 is the vertical view of constant-force drop rope device overhead table tennis net;

Fig. 3 is the left view of constant-force drop rope device overhead table tennis net;

Fig. 4 is that the A-A of Fig. 3 is to cutaway view.

The specific embodiment

The last mesh bag 10 and the hanging net rope 2 outside pulling force that The present invention be directed to existing table tennis net device are uncertain, and level of tightness there are differences, and identical power table tennis touches upper edge, a plurality of nets top 11 and exists the different drawback of bounce-back to propose.Constant-force drop rope device overhead table tennis net of the present invention be based upon on the device basics such as existing table tennis table 17, net 12, round bar 19 and hanging net rope 2 a kind of new equipment; This kind new equipment monnolithic case size satisfies three places " 15.25 centimetres " requirement of existing tennis competition rule predetermining, concrete modular construction correlation and technical characterictic such as Fig. 1, Fig. 2, Fig. 3, shown in Figure 4.

Vertically connect deltiod net post 6 above the outer end of the clamp 1 that is provided with respectively in the left and right sides of table tennis table 17 respectively; Both sides process penetrating axial trough 8 above deltiod net post 6; Axle sleeve 20 is installed in spill pulley 18; Screw 7 passes the upper end that axial trough 8 axle sleeves 20 are connected spill pulley 18 deltiod net post 6; Passing through axial trough 8 has adjustment spill pulley 18 and weighs down rope 3 function of height up and down, and hanging net rope gag lever post 9 is inboard by being threaded in deltiod net post 6 tops, and function is that the height and the hanging net rope 2 of stretching qualification hanging net rope 2 is straightened.At the outer face of the clamp 1 that is positioned at table tennis table 17 left sides riveted joint tether bar 4; Function is to hitch hanging net rope 2 and the left end that weighs down rope 3; Lower surface at the clamp 1 that is positioned at table tennis table 17 right sides is fixedly connected spring leaf 13 by screw 14; Function is that stretching hanging net rope 2 is fixedly clamped, and net is opened up and down; Behind the round bar 19 inserting side mesh bags 5, again side mesh bag 5 is inserted in the deltiod net post 6, with opening about net; Weigh down rope 3 and walk around the outside of spill pulley 18, right-hand member ties up on the pouring weight 16 through shackle 15.Pouring weight 16 weighs down rope 3 through 15 pairs of shackles and produces identical pulling force, makes to weigh down rope 3 stretching and bounce above upper edge 11, net top and be steady state.

When a plurality of billiard tables all adopt the stressed tractive of pouring weight of same weight to weigh down rope separately; When each weighs down rope to receive pulling force is identical; Identical power table tennis touches that to weigh down that its bounce-back of rope same position changes be identical, and it is uncertain that this can effectively avoid on the existing net assembly mesh bag and the hanging net outside pulling force of restricting, and level of tightness there are differences; Identical power table tennis is touched net and is pushed up the different drawback of upper edge same position bounce-back, helps the sportsman and judges assurance table tennis net bounce-back Changing Pattern.The constant-force drop rope device overhead table tennis net of the present invention's design is realized the athletic competition condition for this field and is answered the requirement of fairness to have practical significance.

Claims

1. constant-force drop rope device overhead table tennis net; In the left and right sides of table tennis table (17) clamp (1) is set respectively; Top, outer end at clamp (1) is provided with deltiod net post (6); The side mesh bag (5) that is with round bar (19) is installed in the said deltiod net post (6), hanging net rope (2) is set in the last mesh bag (10) of net (12), it is characterized in that: both sides, deltiod net post (6) top are provided with gag lever post (9) and penetrating axial trough (8) respectively; Through screw (7) spill pulley (18) is installed in the said penetrating axial trough (8), axle sleeve (20) is set in the said spill pulley (18);

The lower surface of riveting the clamp (1) on tether bar (4), right side in the outer face of the clamp (1) that is positioned at table tennis table (17) left side is fixedly connected folder hanging net rope spring leaf (13) through screw (14); Said rope bar (4) is gone up system to be had hanging net rope (2) and weighs down rope (3); The outside that the other end of said bob rope (3) is walked around said spill pulley (18) is connected with pouring weight (16) through shackle (15), and the outside that the other end of said hanging net rope (2) is walked around said gag lever post (9) is connected with folder hanging net rope spring leaf.

2. constant-force drop rope device overhead table tennis net according to claim 1 is characterized in that: between said hanging net rope gag lever post (9) and the deltiod net post (6) through being threaded.