CA1231353A - Flexible grommet strip having protective grommets for rackets, especially tennis rackets - Google Patents
Flexible grommet strip having protective grommets for rackets, especially tennis racketsInfo
- Publication number
- CA1231353A CA1231353A CA000457657A CA457657A CA1231353A CA 1231353 A CA1231353 A CA 1231353A CA 000457657 A CA000457657 A CA 000457657A CA 457657 A CA457657 A CA 457657A CA 1231353 A CA1231353 A CA 1231353A
- Authority
- CA
- Canada
- Prior art keywords
- strip
- stringer
- expansion
- rackets
- stringer strip
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000001681 protective effect Effects 0.000 title description 6
- 239000013013 elastic material Substances 0.000 claims description 3
- 230000002633 protecting effect Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 2
- 241000282320 Panthera leo Species 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B49/00—Stringed rackets, e.g. for tennis
- A63B49/02—Frames
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B49/00—Stringed rackets, e.g. for tennis
- A63B49/02—Frames
- A63B49/022—String guides on frames, e.g. grommets
Landscapes
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Physical Education & Sports Medicine (AREA)
- Insulating Bodies (AREA)
- Braiding, Manufacturing Of Bobbin-Net Or Lace, And Manufacturing Of Nets By Knotting (AREA)
- Golf Clubs (AREA)
- Developing Agents For Electrophotography (AREA)
- Manufacturing Of Micro-Capsules (AREA)
- Display Devices Of Pinball Game Machines (AREA)
- Laminated Bodies (AREA)
- Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
- Adornments (AREA)
- Purses, Travelling Bags, Baskets, Or Suitcases (AREA)
- Aerials With Secondary Devices (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A stringer strip for tennis rackets, is provided with an expansion section between each pair of string protect-ing sleeves. Thus, the protecting sleeves may, in a simple manner, be made to coincide positionally with boreholes for strings to be pulled through the frame of a racket. In pre-ferred embodiments the expansion sections are formed by waves lying in the plane of the strip or by waves extending normal thereto.
A stringer strip for tennis rackets, is provided with an expansion section between each pair of string protect-ing sleeves. Thus, the protecting sleeves may, in a simple manner, be made to coincide positionally with boreholes for strings to be pulled through the frame of a racket. In pre-ferred embodiments the expansion sections are formed by waves lying in the plane of the strip or by waves extending normal thereto.
Description
This invention relates to a flexible stringer strip for racket having a stringed hitting surface, especially ten-nix rackets, and having sleeves for protection of the strings.
In conventional stringer strips for tennis rackets, it is often very difficult, because of distances between the protective sleeves in the prefabricated strips and because ox a lack of very precise matching of said protective sleeves with the Berlioz for the strings existing in the frame of the tennis rackets, to insert the protective sleeves into the Berlioz. The reason for this is, inter alias that, possibly with the exception of the Berlioz in the center of the racket, the Berlioz along the frame have different angles with respect to a common reference axis since at the point of the Berlioz, the direction of said Berlioz extends normal or almost normal to an imaginary tangent line at the frame.
U.S. Patent No. 3,930,648, discloses a flexible stringer strip ox the type initially mentioned. However, this strip is provided with relatively thick supporting cushions or pads between the individual sleeves for supporting the fasten-in loops that are formed where strings are pulled through a sleeve and returned back through an adjacent sleeve. Further-more, this strip must be adapted to the arrangement of bore-holes of the racket construction by making the distances between adjacent sleeves, in the direction to the center and to the head of the racket, larger at a varying degree than in the remaining arched area of the edge. A particular stringer strip of this type can only be utilized for a specific racket and cannot be used for rackets having different distances between holes. In addition, because of the above-mentioned different angular pistons and the unavoidable tolerances of the Berlioz, the assembly process is relatively difficult.
The present invention provides a stringer strip of Jo the above-mentioned type or a method to circumvent -these dip-ficultles by simple means so that, without any additional energy or time requirements, the stringer strip with the sleeves can be fastened more easily on the racket and manufac-luring tolerances can easily be compensated for.
According to the present invention there is provided a flexible stringer strip of hard elastic material for a racket having stretched strings, the strip having string-pro-tooting sleeves arranged at a definite distance apart and made in one piece with the stringer strip, in which the stringer strip in each portion of the stringer strip between -two string-protecting sleeves exhibits at least one expansion port lion such that under tensile loading of the stringer strip in the direction of its longitudinal extent only or essentially only the said expansion portion is able to expand.
In one embodiment of the present invention the expansion portion forms at least one part of an expansion wave which, seen from the narrow edges of the stringer strip runs in the plane of the strip.
In another embodiment of the present invention the expansion portion forms at least one part of an expansion wave which runs perpendicularly to the plane of the strip. Desire ably each expansion wave is formed by at least two adjacent notches extending from the one narrow edge and directed towards the opposite narrow edge with adjacent notches start-in respectively at opposite narrow edges of the stringer strip.
The present invention will be further illustrated by the accompanying drawings which show, for purposes of thus-traction only several embodiments in accordance with the pro-sent invention and in which:-Figure 1 shows a stringer strip with expansion waves . .
..... ,. Jo
In conventional stringer strips for tennis rackets, it is often very difficult, because of distances between the protective sleeves in the prefabricated strips and because ox a lack of very precise matching of said protective sleeves with the Berlioz for the strings existing in the frame of the tennis rackets, to insert the protective sleeves into the Berlioz. The reason for this is, inter alias that, possibly with the exception of the Berlioz in the center of the racket, the Berlioz along the frame have different angles with respect to a common reference axis since at the point of the Berlioz, the direction of said Berlioz extends normal or almost normal to an imaginary tangent line at the frame.
U.S. Patent No. 3,930,648, discloses a flexible stringer strip ox the type initially mentioned. However, this strip is provided with relatively thick supporting cushions or pads between the individual sleeves for supporting the fasten-in loops that are formed where strings are pulled through a sleeve and returned back through an adjacent sleeve. Further-more, this strip must be adapted to the arrangement of bore-holes of the racket construction by making the distances between adjacent sleeves, in the direction to the center and to the head of the racket, larger at a varying degree than in the remaining arched area of the edge. A particular stringer strip of this type can only be utilized for a specific racket and cannot be used for rackets having different distances between holes. In addition, because of the above-mentioned different angular pistons and the unavoidable tolerances of the Berlioz, the assembly process is relatively difficult.
The present invention provides a stringer strip of Jo the above-mentioned type or a method to circumvent -these dip-ficultles by simple means so that, without any additional energy or time requirements, the stringer strip with the sleeves can be fastened more easily on the racket and manufac-luring tolerances can easily be compensated for.
According to the present invention there is provided a flexible stringer strip of hard elastic material for a racket having stretched strings, the strip having string-pro-tooting sleeves arranged at a definite distance apart and made in one piece with the stringer strip, in which the stringer strip in each portion of the stringer strip between -two string-protecting sleeves exhibits at least one expansion port lion such that under tensile loading of the stringer strip in the direction of its longitudinal extent only or essentially only the said expansion portion is able to expand.
In one embodiment of the present invention the expansion portion forms at least one part of an expansion wave which, seen from the narrow edges of the stringer strip runs in the plane of the strip.
In another embodiment of the present invention the expansion portion forms at least one part of an expansion wave which runs perpendicularly to the plane of the strip. Desire ably each expansion wave is formed by at least two adjacent notches extending from the one narrow edge and directed towards the opposite narrow edge with adjacent notches start-in respectively at opposite narrow edges of the stringer strip.
The present invention will be further illustrated by the accompanying drawings which show, for purposes of thus-traction only several embodiments in accordance with the pro-sent invention and in which:-Figure 1 shows a stringer strip with expansion waves . .
..... ,. Jo
2 -31 3~3 extending in the plane of the strip;
Figure 2 is a side view of a stringer strip where the expansion waves extend normal the plane of the strip; and Figure 3 is a top view of the strip according to Figure 2.
A stringer s-trip, for a Dennis racket or for other rackets having a hitting surface spanned with sirings, has the reference number 1, with the protecting sleeves 2 of said racket being provided at a predetermined distance from one another and projecting perpendicularly from -the plane of the body of the s-trip, to which they are unnatural formed. In the strip 1, made of a hard-elastic material, sections 3, in thy form of expansion waves 4, are in each case provided between two protecting sleeves 2 in order to compensate for variations in the lengthwise direction of the strip.
The expansion waves 4, according to Figure 1 embody-mint, when viewed from the direction of the narrow edges 5,6, extend in the plane of the strip 1. Furthermore, Figure 1 shows three forms of planar expansion waves 4. In the left representation, they are formed by at least two (and as shown, at least three) alternatingly by positioned slots or notches 7 and 8 which extend laterally from the narrow edges 5 and 6 toward the opposite narrow edge 6 or 5, respectively. The result is that, between each pair of a protective sleeves 2, in the expansion section 3, an expansion wave 4 is produced.
By means of these expansion waves the distance 9 between each pair of protective sleeves 2 can easily be varied and can be adapted, without extensive expenditure, to the distances be-tweet the Berlioz of a racket frame through which the strings are pulled. The length of the expansion waves 4 in Figure 1, relative to -the centerline M, can amount to half a wavelength to several wavelengths . One wavelength
Figure 2 is a side view of a stringer strip where the expansion waves extend normal the plane of the strip; and Figure 3 is a top view of the strip according to Figure 2.
A stringer s-trip, for a Dennis racket or for other rackets having a hitting surface spanned with sirings, has the reference number 1, with the protecting sleeves 2 of said racket being provided at a predetermined distance from one another and projecting perpendicularly from -the plane of the body of the s-trip, to which they are unnatural formed. In the strip 1, made of a hard-elastic material, sections 3, in thy form of expansion waves 4, are in each case provided between two protecting sleeves 2 in order to compensate for variations in the lengthwise direction of the strip.
The expansion waves 4, according to Figure 1 embody-mint, when viewed from the direction of the narrow edges 5,6, extend in the plane of the strip 1. Furthermore, Figure 1 shows three forms of planar expansion waves 4. In the left representation, they are formed by at least two (and as shown, at least three) alternatingly by positioned slots or notches 7 and 8 which extend laterally from the narrow edges 5 and 6 toward the opposite narrow edge 6 or 5, respectively. The result is that, between each pair of a protective sleeves 2, in the expansion section 3, an expansion wave 4 is produced.
By means of these expansion waves the distance 9 between each pair of protective sleeves 2 can easily be varied and can be adapted, without extensive expenditure, to the distances be-tweet the Berlioz of a racket frame through which the strings are pulled. The length of the expansion waves 4 in Figure 1, relative to -the centerline M, can amount to half a wavelength to several wavelengths . One wavelength
- 3 is preferably between 1.5 and 10 mm, especially between 2.5 and 4 mm. The flexibility of the expansion waves 4 can be adjusted or fixed by the dimensioning of the standing ridges 10 and/or edge arches 11 extending transversely to the strip 1.
In the center waves represented in Fig. 1, V-shaped notches 12 are provided for forming the expansion waves 4. In the case of the waves represented on the rotund side of Figure 1, the center notch is formed as a V-notch 12 and the outside notches 13 are half-V-shaped notches 13.
In the embodiment is shown in Figures 2 and 3, the expansion waves 4 extend normal to the plane the body of the strip 1, as shown particularly clearly in Figure 2 by the pro-section of the waves above and below the centerline M. In this case, the material may also be weakened, as shown by the left and the center embodiment wherein the waves are thinner than the adjoining sections of strip 1. This makes it posy sidle that the wave peaks need not necessarily project over the top and bottom surfaces 14 and 15 of the strip 1, as is the case with the central section 3.
.-, Jo _
In the center waves represented in Fig. 1, V-shaped notches 12 are provided for forming the expansion waves 4. In the case of the waves represented on the rotund side of Figure 1, the center notch is formed as a V-notch 12 and the outside notches 13 are half-V-shaped notches 13.
In the embodiment is shown in Figures 2 and 3, the expansion waves 4 extend normal to the plane the body of the strip 1, as shown particularly clearly in Figure 2 by the pro-section of the waves above and below the centerline M. In this case, the material may also be weakened, as shown by the left and the center embodiment wherein the waves are thinner than the adjoining sections of strip 1. This makes it posy sidle that the wave peaks need not necessarily project over the top and bottom surfaces 14 and 15 of the strip 1, as is the case with the central section 3.
.-, Jo _
Claims (5)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A flexible stringer strip of hard elastic mate-rial for a racket having stretched strings, the strip having string-protecting sleeves arranged at a definite distance apart and made in one piece with the stringer strip, in which the stringer strip in each portion of the stringer strip between two string-protecting sleeves exhibits at least one expansion portion such that under tensile loading of the stringer strip in the direction of its longitudinal extent only or essentially only the said expansion portion is able to expand.
2. A stringer strip as in claim 1, in which the expansion portion forms at least one part of an expansion wave which, seen from the narrow edges of the stringer strip runs in the plane of the strip.
3. A stringer strip as in claim 1, in which the expansion portion forms at least one part of an expansion wave which runs perpendicularly to the plane of the strip.
4. A stringer strip as in claim 1 or 2, in which each expansion wave is formed by at least two adjacent notches extending from the one narrow edge and directed towards the opposite narrow edge with adjacent notches starting respec-tively at opposite narrow edges of the stringer strip.
5. A stringer strip as in claim 2, 3 or 4, in which the wavelength of one expansion wave is 1.5 to 10 mm.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3324140A DE3324140C1 (en) | 1983-07-05 | 1983-07-05 | Flexible sleeve band with protective sleeves for ball game, especially tennis rackets |
| DEP3324140.6 | 1983-07-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1231353A true CA1231353A (en) | 1988-01-12 |
Family
ID=6203159
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000457657A Expired CA1231353A (en) | 1983-07-05 | 1984-06-28 | Flexible grommet strip having protective grommets for rackets, especially tennis rackets |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP0130622B1 (en) |
| JP (1) | JPS6036071A (en) |
| KR (1) | KR850000998A (en) |
| AT (1) | ATE24408T1 (en) |
| AU (1) | AU3028184A (en) |
| CA (1) | CA1231353A (en) |
| DE (1) | DE3324140C1 (en) |
| ES (1) | ES289151Y (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0246381Y2 (en) * | 1985-12-04 | 1990-12-06 | ||
| JPS62202868U (en) * | 1986-06-17 | 1987-12-24 | ||
| DE3724205A1 (en) * | 1987-07-22 | 1989-01-26 | Tegro Gmbh | TENNIS, SQUASH, BADMINTON RACKETS |
| US5137274A (en) * | 1990-12-19 | 1992-08-11 | Soong Tsai C | Extensible grommet strip for sports rackets |
| WO1994013364A1 (en) * | 1992-12-11 | 1994-06-23 | Prince Sports Group, Inc. | Grommet strips for tennis racquets |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1059989A (en) * | 1952-04-24 | 1954-03-30 | Snowshoe training | |
| US3805366A (en) * | 1969-08-28 | 1974-04-23 | Maark Corp | Method of manufacturing a tennis racket |
| US3930648A (en) * | 1974-09-26 | 1976-01-06 | A-T-O Inc. | Game racket and stringing means therefor |
-
1983
- 1983-07-05 DE DE3324140A patent/DE3324140C1/en not_active Expired
-
1984
- 1984-06-28 CA CA000457657A patent/CA1231353A/en not_active Expired
- 1984-07-04 ES ES1984289151U patent/ES289151Y/en not_active Expired
- 1984-07-04 EP EP84107792A patent/EP0130622B1/en not_active Expired
- 1984-07-04 AT AT84107792T patent/ATE24408T1/en not_active IP Right Cessation
- 1984-07-04 AU AU30281/84A patent/AU3028184A/en not_active Abandoned
- 1984-07-05 JP JP59138069A patent/JPS6036071A/en active Granted
- 1984-07-05 KR KR1019840003876A patent/KR850000998A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| ES289151Y (en) | 1986-10-01 |
| JPS6036071A (en) | 1985-02-25 |
| AU3028184A (en) | 1985-01-10 |
| EP0130622A1 (en) | 1985-01-09 |
| JPH021511B2 (en) | 1990-01-11 |
| ATE24408T1 (en) | 1987-01-15 |
| KR850000998A (en) | 1985-03-14 |
| ES289151U (en) | 1986-02-16 |
| EP0130622B1 (en) | 1986-12-30 |
| DE3324140C1 (en) | 1985-02-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |