CN102188802B - Racket threader - Google Patents
Racket threader Download PDFInfo
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- CN102188802B CN102188802B CN 200810109217 CN200810109217A CN102188802B CN 102188802 B CN102188802 B CN 102188802B CN 200810109217 CN200810109217 CN 200810109217 CN 200810109217 A CN200810109217 A CN 200810109217A CN 102188802 B CN102188802 B CN 102188802B
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- threader
- drag devices
- rotating disk
- axle
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Abstract
The invention discloses a racket threader which is designed according to the human engineering. In some embodiments, the threader comprises a bracket extending from a base, wherein the bracket and the plane form an angle ranging from about 70 DEG to 89 DEG. In some embodiments, the threader comprises a releasable resistive device which is configured to generate resistance to the rotation of a turntable surrounding an axis.
Description
Relevant U. S. application data
The sequence number of submitting on April 11st, 2007 is 60/922,799 U.S. Provisional Patent Application.
Technical field
The present invention relates to a kind of for the machine of racket threading.This threader has the ergonomics feature of enhancing.
Background technology
For racket threading needs quite a large amount of hand labors.Racket threader is by keeping racket to play booster action in position and for threading provides required tension force, and still most work is still completed by manual.More particularly, the workman must be positioned at racket in threader, then every horizontal line or vertical line is formed a line respectively, and then every horizontal line of layout or vertical line are to form final threading grid.
The threading work of racket usually need stand before threader in one day a lot of hour.Traditional threader comprises the threading platform that is positioned at a support bracket fastened top, has a rotating disk.Rotating disk turns at a plane internal rotation parallel to the ground.Due to the plan-position of constant bearing and the rotating disk of support, for the people of racket threading must adjust his or her posture to adapt to the position of threader.Especially, the racket threading person shoulder often will be in the position more much higher than another.And, the constant bearing of threader often causes racket threading person's hunch above rotating disk.The posture of this clumsiness of being brought by traditional threader can cause injury and tired usually, and these persons' that finally can reduce the racket threading operating efficiency.In addition, traditional threader generally comprises a upright support that is positioned on base.The position of this support and/or base can hinder threading person's pin and/or leg, thus the person's that makes the threading posture is especially awkward.
In the process of threading, racket is clamped on the threading platform, and rotating disk makes racket threading person can be according to the different step hand rotation racket of threading process to adjust the position of racket.The power of any tangential direction can freely be rotated the rotating disk on traditional threader, unless or until stop further rotation with rim brake.If the threading platform is positioned in threader, rotating disk will turn with the uneven plane internal rotation in ground like this, namely the direction towards the racket threading person tilts, and any handle that is clamped in the racket on the threading platform all can move the supreme minimum point of stating in the plane under action of gravitation.Consequently, even if the location of rotating disk is very light for the threading person, but for the impact of the gravity that overcomes clamped racket, must continually racket be retracted preposition or continually the rim brake on the locking and unlocking rotating disk be also the part trouble.
We are desirable to provide a kind of threader according to the ergonomics design, and can not make the user adopt awkward or uncomfortable posture, also needn't constantly manually overcome the impact of the gravity of rotating disk.
Summary of the invention
The invention provides a kind of racket threader that is used to racket threading according to the ergonomics design.This threader comprises that one is supported on base in the plane of basic horizontal with threader, one has the support in zone, upper and lower end, the lower end region of support extends upward from the primary importance of base, the upper end region of one adjustable threading platform and support is connected at second place place, and the line tension assembly is connected with support.
The primary importance of base can be restricted to the center that support is attached to the area of coverage that produces on base.Similarly, the second place can be restricted to the center that the threading platform is attached to the area of coverage that produces on support." area of coverage " word is the concept of two dimension, and it has represented two-part common factor, has described the zone of occuring simultaneously.The first and second positions define a line, and this line becomes a predetermined angle with horizontal line.
In one embodiment, support begins to extend from base with the angle that becomes about 70 to 89 degree (becoming 1 degree with a vertical plane to 20 degree) with a horizontal plane.As selection, support also can become with a horizontal plane angle of about 80 to 85 degree (becoming 5 degree with a vertical plane to 10 degree) to begin to extend from base, for example becomes 83 degree (becoming 7 degree with a vertical plane) with a horizontal plane.The angle direction of support provides the sufficient space of stopping over for the user who stands in before threader.In addition, a recessed zone can be set towards the place ahead of user on base be used for holding at least a portion of user's pin, thus make the user can stand when threading from racket more close to.
Angle between base and support is adjustable.For example, a bracket adjustment mechanism connects base and support, and this bracket adjustment mechanism can adjust the angle of the straight line that is limited by the first and second positions.This bracket adjustment mechanism design becomes to adjust at 0.1 degree the angle of above-mentioned straight line to the scopes of 15.0 degree.
In another embodiment, adjustable threading platform comprise one can around the rotating disk of first axle rotation with is connected first a releasable drag devices that is connected with rotating disk, for example be coated with the rim brake of grease.This first releasable drag devices can be positioned between the operating position and out of mesh operating position of engagement, operating position place in engagement, drag devices restriction rotating disk is around the rotation of first axle, and at out of mesh operating position place, drag devices does not limit rotating disk around the rotation of first axle.
The involuntary rotation that the first releasable drag devices can be rotating disk provides resistance.Especially, when racket in position and the threading platform be when tilting, may be for example that the angle of inclination by support causes, this first releasable drag devices can be eliminated the impact of gravity.For example, the resistance that the first releasable drag devices provides can be limited in the rotation (overcome the resistance of moment of torsion) of rotating disk around first axle in the scope of 0.1 to 36in-lbf (in-lb), is more preferably in 0.1 to 12in-lbf scope.
The first releasable drag devices is fit to comprise a high-viscosity fluid, and for example grease, be used for limiting the rotation of rotating disk when being in the engagement operations position.For example, the viscosity scope of high-viscosity fluid can be between 1 to 500 centipoise (cP).In certain embodiments, the first releasable drag devices comprises and contacted the first member of high-viscosity fluid and second component, and at least one in the first member and second component rotated around first axle.The first member and/or second component can comprise a plurality of and the contacted protuberance of high-viscosity fluid, for example isolated donut.For example, each first member and second component can comprise a plurality of isolated donuts, and the annulus of these the first and second parts corresponds to each other, thereby makes the part of the annulus of a member in these members can be arranged between the annulus of another member.The first releasable drag devices also can comprise a door bolt section, this door bolt section releasedly with the first member engagement, thereby stop the first member to rotate around first axle.
The second releasable drag devices is independent of the first releasable drag devices, and it also can be connected with the threading platform.For example, rotating disk can comprise an annulus centered by first axle, and the second releasable drag devices is designed to mesh with above-mentioned annulus releasedly, thereby stops rotating disk around the rotation of first axle.
The embodiment of any one or a plurality of threader described here can be used for the racket threading for tennis racket, squash bat, wall ball racket, racket and any other threading equally.Irrelevant with the type of racket, as long as use the threader of having improved in the present invention all can improve the harmony of threader.
Description of drawings
Fig. 1 is the perspective view of racket threader.
Fig. 2 is the side view of racket threader.
Fig. 3 is the schematic diagram of racket threader.
Fig. 4 is when being clamped in racket on racket threader, the side view of the derivative posture of user.
Fig. 5 is when being clamped in racket on racket threader, the side view of the preferred posture of user.
Fig. 6 is when being through vertical line on racket, the side view of the derivative posture of user.
Fig. 7 is when being through vertical line on racket, the side view of the preferred posture of user.
Fig. 8 is with the horizontal line layout on racket the time, the side view of the derivative posture of user.
Fig. 9 is with the horizontal line layout on racket the time, the side view of the preferred posture of user.
Figure 10 is another perspective view of racket threader.
Figure 11 is the top view of threading platform on racket threader.
Figure 12 is the perspective view of threading platform.
Figure 13 is the interior views of threading platform.
Figure 14 is the cutaway view of threading platform 14-14 intercepting along the line in Figure 12.
Figure 15 is the cutaway view of releasable drag devices.
The specific embodiment
With reference to figure 1 and Fig. 2, the racket threader that designs according to ergonomics is labeled as 20.The ergonomics feature of threader 20 is in the threading process of racket, provides higher comfortableness to the user.
" primary importance " 32 on base 22 can be restricted to the center that support 24 is attached to the area of coverage 36 that produces on base 22.Similarly, " second place " 34 can be restricted to the center that threading platform 26 is attached to the area of coverage 38 that produces on support 24." area of coverage " word is the concept of two dimension, and it has represented two-part common factor, has described the zone of occuring simultaneously.The first and second positions 32,34 define line 40, and this line becomes a predetermined angular () with horizontal plane.When the angle θ between discussion support 24 and base 22, what we referred to is exactly this line.Support 24 itself can be crooked, " C " shape for example, can be also obviously crooked in a plurality of positions of length direction, but in this case, if line 40 is connected with primary importance 32, and be positioned at angular range defined in this by the angle θ from horizontal level begins that the second place 34 limits, threader 20 still within the scope of the invention so.
In certain embodiments, support 24 begins to become about 70 degree to the angle of 89 degree (becoming 1 degree with a vertical plane to 20 degree) to extend to basic direction towards the user with horizontal plane from base 22.As selection, support 24 also can become with a horizontal plane angle of about 80 to 85 degree (becoming 5 degree with a vertical plane to 10 degree) to begin to extend from base 22, for example becomes 83 degree (becoming 7 degree with a vertical plane) with a horizontal plane.On the contrary, the support of traditional threader begins vertical extension from base.The angle direction of support 24 described in the invention provides the sufficient space of stopping over for standing in threader 20 front users.Especially, between support 24 and base 22, non-perpendicular angle can be the user the more sufficient space of stopping over is provided, therefore can make the user can stand from threader 20 more close to.For example, the inclination of 7 degree becomes 83 angles of spending with horizontal plane, and the situation more vertical with base 22 than support 24 provides the space of stopping over of 40-50% more.
In addition, base 22 also can be designed to provide for the user form in the comfortable district of standing.Base 22 comprises one towards user's front 42 and the back 44 relative with front 42.As Figure 1-3, the front portion 42 of base 22 can limit a recessed zone and be used for holding at least a portion of user's pin, thus make the user can stand when threading from racket more close to.
When being racket threading, must at first racket be clamped on adjustable threading platform 26.As shown in Figure 4, traditional threader 46 makes the user that the posture that racket is clamped on the threading platform is very awkward.By, support 24 is designed to and base 22 off plumb forms and the height that increases support 24, the user desirable operating position can stand from threading platform 26 more close to, and needn't be on threading platform 26 hunch, as shown in Figure 5.The height of support 24 can be that fix or adjustable.Any suitable arrangement for adjusting height all can be used on threader 20, for example telescopic arrangement for adjusting height.
Additional step in the threading process also can make a lot of users produce awkward posture.As shown in Figure 6, due to threading platform and user's relative position, the threading process of vertical line may cause neck fatigue or other discomfort.Again, by support 24 being designed to and base 22 off plumb forms and the height that increases support 24, the user that orientates as of threading platform 26 provides suitable working space, at desirable operating position place, the user can must be more straight at the station, position of relative comfort, as shown in Figure 7.
Similarly, focus on that the layout of the horizontal line of details also can cause the tired of neck or other discomfort, example as shown in Figure 8.By support 24 being designed to and base 22 off plumb forms, the height of threading platform 26 can be become layout horizontal line on the position that can make the user stand in the better operation that more meets ergonomics with angle design, as shown in Figure 9.
In certain embodiments, the angle of 24, base 22 and support can be that be permanently fixed or non-adjustable.But in other embodiment, the angle that base 22 and support are 24 is adjustable.For example, a bracket adjustment mechanism connects base 22 and support 24, and this bracket adjustment mechanism can adjust the angle by the first and second positions 32,34 straight lines that limit 40.The bracket adjustment device can be designed to regulate the angle of line 40 in the scope of 0.1 to 15.0 degree.
The adjusting of base 22 and 24 angles of support can be completed manually or automatically.For example, the bracket adjustment device can comprise by the chain that orbits and forms driving mechanism.For example, driving mechanism can be by electric control.Those skilled in the art are familiar with the various driving mechanisms that are suitable for adjusting base 22 and 24 angles of support.Therefore, the details of this mechanism is not described in detail in this.
As shown in figure 11, threading platform 26 comprises a plurality of framework fixtures 48, is used for racquet frame is remained on appropriate location on threading platform 26, also comprises two threading clips 50, is used in the process of threading retention wire in position.As shown in figure 12, thread tensioner 52 is connected with support 24 on the top of threading platform 26.During threading, thread tensioner 52 is pulled to line the tension state of expectation.Threading platform 26 also can be designed to form as shown in FIG. 11 and 12 or be designed to the form of the traditional threading platform in traditional threader.
In certain embodiments, as shown in Figure 11-13, threading platform 26 can comprise one around the rotating disk 54 of first axle 56 rotation with is connected the first releasable drag devices 58 that is connected with rotating disk 54, for example be coated with the rim brake of grease.Rotating disk 54 makes racket to turn at the plane internal rotation at racquet frame place.The first releasable drag devices 58 can be positioned between the operating position and out of mesh operating position of engagement, operating position place in engagement, drag devices 58 restriction rotating disks 54 are around first axle 56 rotations, at out of mesh operating position place, drag devices 58 does not limit rotating disk 54 around first axle 56 rotations.
The involuntary rotation that the first releasable drag devices 58 can be rotating disk provides resistance.Especially, when racket in position and threading platform 26 be when tilting, may be for example that the angle of inclination by support 24 causes, this first releasable drag devices 58 can be eliminated the impact of gravity.For example, the resistance that the first releasable drag devices provides can be limited in rotating disk in 0.1 to 36in-lbf scope around the rotation (overcoming the resistance of moment of torsion) of first axle, be more preferably in 0.1 to 12in-lbf scope.
The first releasable drag devices 58 is fit to comprise a high-viscosity fluid, and for example grease, be used for when being in the engagement operations position, the rotation of restriction rotating disk 54.For example, the viscosity scope of high-viscosity fluid can be between 1 to 500 centipoise.By using the lubricant of this high viscosity, rotating disk 54 can be remained on the appropriate position, even when rotating disk 54 is positioned on horizontal plane uneven plane with threader 20 places, do not need mechanical caging, rotating disk 54 also can remain on the appropriate location.
In certain embodiments, the first releasable drag devices 58 comprise with contacted the first member of high-viscosity fluid and second component 60,62, the first members and second component 60,62 at least one around first axle 56 rotation.Figure 14 is the cutaway view of threading platform 26, and it shows the first and second members 60,62 in the first releasable drag devices 58.Figure 15 is the more detailed cutaway view of the first releasable drag devices 58.First and/or second component 60,62 can comprise a plurality of and the contacted protuberance of high-viscosity fluid, for example isolated donut.For example, each first member and second component 60,62 can comprise a plurality of isolated donuts, and these first members and second component 60,62 annulus correspond to each other, thereby make some part of the annulus of a member in these members can be arranged between the annulus of another member.In substituting preferred embodiment, the first and second members 60 and 62 can have the form that has the varying number protuberance at different directions.
The first releasable drag devices 58 can comprise a door bolt section 64, this door bolt section releasedly with the first member 60 engagements, thereby stop the first member 60 to rotate around first axle 56.Door bolt section 64 can be by manually-operated or by traditional actuating mechanism straighforward operation.In a preferred embodiment, door bolt section 64 is used in conversion the first drag devices 58 between the operating position of engagement and out of mesh operating position, operating position place in engagement, drag devices 58 restriction rotating disks 54 are around first axle 56 rotations, at out of mesh operating position place, drag devices 58 does not limit rotating disk 54 around first axle 56 rotations.When door bolt section 64 is positioned in position with the first member 60 engagements, and when stoping the first member 60 around the rotation of first axle 56, second component 62 still can be freely around first axle 56 rotations.But, if the first member 60 is in latched position, second component rotates with respect to the first member 60, and the high-viscosity fluid between the corresponding protuberance of the first and second members 60 and 62 will be to the rotation generation resistance of second component 62 around first axle 56 so.
As shown in figure 13, the second releasable drag devices 66 that is independent of the first releasable drag devices 58 can be connected with threading platform 26.For example, as shown in figure 11, rotating disk 54 can comprise that a releasable drag devices 66 of the annulus 68, the second centered by first axle 56 is designed to mesh with above-mentioned annulus 68 releasedly, to stop rotating disk 54 around the rotation of first axle 56.The frame for movement of the second releasable drag devices 66 is similar to bicycle brake, has a lever by user's operation, and during use, one end and opposite end can contact with the inner surface of annulus 68, stop the rotation of rotating disk 54 by producing enough frictional force.Preferably, the second releasable drag devices 66 is locked releasedly by the user.Only can compare by restricting rotation with the first releasable drag devices 58, the second releasable drag devices 66 can directly stop rotating disk 54 around the rotation of first axle 56, comprises rotating disk 54 is stopped in rotary course.
The embodiment of any one or a plurality of threader described here can be used for the racket threading for tennis racket, squash bat, wall ball racket, racket and any other threading equally.Especially, threader 20 is used in is racket threading in organized professional and/or emulative match.In addition, threader 20 also can be designed to satisfy the form for the ITF rule request of tennis racket stringing.Irrelevant with the type of racket, as long as use the threader of having improved in the present invention all can improve the harmony of threader 20.
Although illustrated and described the preferred embodiments of the present invention, should be understood that, can carry out multiple modification without departing from the spirit and scope of the present invention.For example, embodiment described here is for for the threader of tennis racket stringing illustrates, but principle of the present invention can be used for carrying out for the racket of in fact every other type the threader of threading equally.Therefore, the present invention ought to comprise alternative, the modifications and variations in the claims spirit and scope that all are such.
Claims (22)
1. one kind is the racket threader of racket threading by the user who is in operating position, and this threader comprises:
Base, it is configured on surface that threader is supported on basic horizontal;
Support, it has upper end region and lower end region, and the lower end region of support extends upward from the primary importance of base;
Adjustable threading platform, it is connected at second place place with the upper end region of support, the first and second positions define a line, this line becomes a predetermined angular with horizontal plane, make this line roughly extend towards user's operating position from primary importance, described predetermined angular is less than or equal to 89 degree from horizontal plane simultaneously more than or equal to 70 degree; With
The line tension assembly that is connected with support.
2. threader as claimed in claim 1, wherein: predetermined angular is less than or equal to 85 degree from horizontal plane simultaneously more than or equal to 80 degree.
3. threader as claimed in claim 1, wherein: predetermined angular is approximately 83 degree from horizontal plane.
4. threader as claimed in claim 1, wherein: base has one towards user's front portion and a rear portion, wherein the front portion of base limits a recessed zone and is used for holding at least a portion of user's pin, thus make the user can stand when threading from racket more close to.
5. threader as claimed in claim 1 further comprises a bracket adjustment device that is connected with support with base, and wherein the bracket adjustment device is designed for adjusting the line that limited by the first and second positions and the angle of horizontal plane.
6. threader as claimed in claim 5, wherein: the bracket adjustment device is designed for adjusting line with respect to horizontal angle in the scope of 0.1 to 15.0 degree.
7. threader as claimed in claim 1, wherein: adjustable threading platform comprises-around the rotating disk of first axle rotation.
8. threader as claimed in claim 7, wherein: adjustable threading platform further comprise one with the first releasable drag devices of rotating disk engagement, wherein the first releasable drag devices is positioned between the operating position and out of mesh operating position of engagement, the first releasable drag devices has limited the rotation of rotating disk around first axle at the operating position place of engagement, and does not limit rotating disk around the rotation of first axle at out of mesh operating position place the first releasable drag devices.
9. threader as claimed in claim 8, wherein: the first releasable drag devices comprises a kind of high-viscosity fluid, is used for rotation at operating position place's restriction rotating disk of engagement.
10. threader comprises:
Base;
Be connected with base and from the upwardly extending support of base;
the adjustable threading platform that is connected with support, this threading platform comprises first a releasable drag devices that meshes with rotating disk around the rotating disk of first axle rotation and, this first releasable drag devices is positioned between the operating position and out of mesh operating position of engagement, releasable drag devices limits rotating disk around the rotation of first axle at the operating position place of engagement, and do not limit rotating disk around the rotation of first axle at the releasable drag devices in out of mesh operating position place, this releasable drag devices comprises a kind of high-viscosity fluid, be used for rotation at the operating position place of engagement restriction rotating disk.
11. threader as claimed in claim 10 further comprises second a releasable drag devices that is connected with the threading platform, wherein the second releasable drag devices is independent of the first releasable drag devices.
12. threader as claimed in claim 11, wherein: rotating disk comprises an annulus centered by first axle, wherein the second releasable drag devices releasedly with this annulus engagement, thereby stop rotating disk to rotate around first axle.
13. threader as claimed in claim 10, wherein: the first releasable drag devices will be limited in 0.1 to the scope of 36in-lbf around the rotating torque of first axle.
14. threader as claimed in claim 10, wherein: the first releasable drag devices will be limited in 0.1 to the scope of 12in-lbf around the rotating torque of first axle.
15. threader as claimed in claim 13, wherein: the resistance by the first releasable drag devices effect is 3lbs or less.
16. threader as claimed in claim 10, wherein: the first releasable drag devices comprises and contacted the first and second members of high-viscosity fluid, and wherein at least one in the first and second members rotated around first axle.
17. threader as claimed in claim 16, wherein: the first releasable drag devices further comprises a door bolt section, wherein should door bolt section releasedly with the first member engagement, rotate around first axle to stop the first member.
18. threader as claimed in claim 16, wherein: at least one in the first and second members comprises a plurality of protuberances with described fluid contact.
19. threader as claimed in claim 18, wherein: described protuberance is a plurality of isolated donuts.
20. threader as claimed in claim 18, wherein: each in the first member and second component comprises a plurality of isolated donuts, and wherein the annulus of first and second portion is configured to correspond to each other, thereby makes the part of the annulus of a member in these members can be arranged between the annulus of another member.
21. threader as claimed in claim 10, wherein: high-viscosity fluid is grease.
22. threader as claimed in claim 10, wherein: the viscosity scope of high-viscosity fluid is 1 to 500cP.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US12/077,012 | 2008-03-14 | ||
| US12/077,012 US7695383B2 (en) | 2007-04-11 | 2008-03-14 | Racquet stringing machine |
| US12/077012 | 2008-03-14 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102188802A CN102188802A (en) | 2011-09-21 |
| CN102188802B true CN102188802B (en) | 2013-11-06 |
Family
ID=44598219
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200810109217 Expired - Fee Related CN102188802B (en) | 2008-03-14 | 2008-04-10 | Racket threader |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102188802B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7427339B2 (en) * | 2020-05-15 | 2024-02-05 | ヨネックス株式会社 | Racket and racket surface treatment method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4326713A (en) * | 1979-02-12 | 1982-04-27 | Balaban J A | Racket stringing apparatus and method |
| EP1153631A2 (en) * | 2000-05-02 | 2001-11-14 | Akira Tsuchida | Gut-clamping mechanism in gut-stretching equipment for tennis rackets |
| CN2623288Y (en) * | 2003-01-30 | 2004-07-07 | 黄淑娥 | Modified sliding rail type thread pulling device of threading machine |
| US6837811B1 (en) * | 2004-03-16 | 2005-01-04 | Pao-Chang Wu | String pulling device for racket stringer |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2791905B2 (en) * | 1989-11-18 | 1998-08-27 | エクテロン，インク． | Fasteners for racket gut tensioning equipment |
-
2008
- 2008-04-10 CN CN 200810109217 patent/CN102188802B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4326713A (en) * | 1979-02-12 | 1982-04-27 | Balaban J A | Racket stringing apparatus and method |
| EP1153631A2 (en) * | 2000-05-02 | 2001-11-14 | Akira Tsuchida | Gut-clamping mechanism in gut-stretching equipment for tennis rackets |
| CN2623288Y (en) * | 2003-01-30 | 2004-07-07 | 黄淑娥 | Modified sliding rail type thread pulling device of threading machine |
| US6837811B1 (en) * | 2004-03-16 | 2005-01-04 | Pao-Chang Wu | String pulling device for racket stringer |
Non-Patent Citations (1)
| Title |
|---|
| JP平3-159666A 1991.07.09 |
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| Publication number | Publication date |
|---|---|
| CN102188802A (en) | 2011-09-21 |
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