US2552020A - Tennis racket - Google Patents
Tennis racket Download PDFInfo
- Publication number
- US2552020A US2552020A US44810A US4481048A US2552020A US 2552020 A US2552020 A US 2552020A US 44810 A US44810 A US 44810A US 4481048 A US4481048 A US 4481048A US 2552020 A US2552020 A US 2552020A
- Authority
- US
- United States
- Prior art keywords
- frame
- groove
- strings
- tennis racket
- covering 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 - Lifetime
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Classifications
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B60/00—Details or accessories of golf clubs, bats, rackets or the like
-
- 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
- A63B49/14—Protection devices on the frame
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B60/00—Details or accessories of golf clubs, bats, rackets or the like
- A63B60/54—Details or accessories of golf clubs, bats, rackets or the like with means for damping vibrations
Definitions
- the present invention relates to a tennis racket characterized by having the points of fixture of the catgut strings in the frame protected against mechanical and temperature influences.
- the arrangement is such that the points of fixture of the catgut strings in the frame lie in a groove disposed longitudinal and which groove is covered towards the outside by a covering strip of heat and damp insulating material.
- a stepped grooving with an inner and an outer groove is formed in the frame, whereby the inserted catgut strings rest on the inner groove and the covering strip is clamped into the outer groove.
- Fig. 1 shows the tennis racket in partial plan view
- Fig. 2 a partial side view thereof
- Fig. 3 a section through the frame of the racket
- Figs. 4 and 5 a section through two detailed alternatives of execution of the frame of the racket.
- frame I of the racket is provided on the outside of its circumference with a stepped groovin by which an inner longitudinal groove 2 and an outer longitudinal groove 3 is formed.
- Frame l is provided with holes 4 for stringing the catgut strings 5.
- the inserted strings 5 rest on the inner groove 2.
- the covering strip 6 protects the points of fixture of the strung-in catgut strings against mechanical action, i. e. damage, and atmospheric influences.
- the grooves 2 and 3 are out exactly to measurement as regards depth and width by means of a moulding machine, so that the frame has the same strength and stiifness around the whole of its circumference.
- the covering strip 6 is inserted in the outer groove 3. Said strip is fixed in the frame by means of the screws 1 with the counter-sunk nuts 8. The fixing of the covering strip by means of screws is provided for the purpose of enabling an easy removal and re-assembly of the covering strip when the racket is being re-strung.
- the grooving 2 and 3 is only brought round as far as the heart piece 9, since the strings leading thereto are fixed to it.
- the covering strip does not need to consist of a single part. With advantage it can be made of laminated insulating strips which can be of various materials.
- the frame I can with expediency be formed of several strips glued together as is shown in Figs. 3 to 5.
- said frame in order to be able to give the frame I a relatively thin cross section, but nevertheless to give it a high power of resistance, said frame, as can be seen from Fig. 4, can be provided with an insert of resistant material such as a band ill of steel or a corrosion resistant aluminum alloy.
- Fig. 5 differs from that shown in Fig. 4 essentially by the strengthening insert Hi being provided bilaterally on each side thereof with a narrow rib II.
- the circumferential edges of the ribs H are with expediency attenuated so that on pressing together the frame formed of several strips said ribs are forced into the adjacent strips whereby a particularly solid bond is achieved.
- a frame In a tennis racket or the like a frame, said frame having inner and outer grooves therein, said inner and outer grooves opening into one another, said outer groove being open to the outside of said frame, said inner groove being narrower than said outer groove, said frame having a plurality of openings therethrough from the inner side of said frame to said inner groove, strings inserted through said openings and seoured to said frame, said strings bein in contact with the inner surface of said inner groove and resting in said inner groove, a covering strip inserted in said outer groove and secured to said frame, said outer groove comprising a seating for said covering strip.
Landscapes
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Physical Education & Sports Medicine (AREA)
- Laminated Bodies (AREA)
Description
y 8, 1951 E. TRIBELHORN 2,552,020)
TENNIS RACKET Filed Aug. 18, 1948 Patented May 8, 1951 UNITED STATES PATENT ()FFlCE 1 Claim. 1
The present invention relates to a tennis racket characterized by having the points of fixture of the catgut strings in the frame protected against mechanical and temperature influences.
For this purpose the arrangement is such that the points of fixture of the catgut strings in the frame lie in a groove disposed longitudinal and which groove is covered towards the outside by a covering strip of heat and damp insulating material. With advantage a stepped grooving with an inner and an outer groove is formed in the frame, whereby the inserted catgut strings rest on the inner groove and the covering strip is clamped into the outer groove.
The annexed drawing shows by way of example a form of embodiment of the present invention, in which:
Fig. 1 shows the tennis racket in partial plan view,
Fig. 2 a partial side view thereof,
Fig. 3 a section through the frame of the racket, and
Figs. 4 and 5 a section through two detailed alternatives of execution of the frame of the racket.
According to the preferred construction shown frame I of the racket is provided on the outside of its circumference with a stepped groovin by which an inner longitudinal groove 2 and an outer longitudinal groove 3 is formed. Frame l is provided with holes 4 for stringing the catgut strings 5. The inserted strings 5 rest on the inner groove 2. Into the outer groove a covering strip 6 of heat and damp insulating material, such as vulcanized fibre, synthetic resins and the like, is fitted. The covering strip 6 protects the points of fixture of the strung-in catgut strings against mechanical action, i. e. damage, and atmospheric influences.
The grooves 2 and 3 are out exactly to measurement as regards depth and width by means of a moulding machine, so that the frame has the same strength and stiifness around the whole of its circumference.
After the strings 5 have been strung on the inner groove 2, the covering strip 6, exactly cut to size, ground and polished, is inserted in the outer groove 3. Said strip is fixed in the frame by means of the screws 1 with the counter-sunk nuts 8. The fixing of the covering strip by means of screws is provided for the purpose of enabling an easy removal and re-assembly of the covering strip when the racket is being re-strung.
In the preferred construction shown the grooving 2 and 3 is only brought round as far as the heart piece 9, since the strings leading thereto are fixed to it.
The covering strip does not need to consist of a single part. With advantage it can be made of laminated insulating strips which can be of various materials.
It is to be understood that the invention is not limited to the exact execution as it is shown and described herewith, but that various alterations and modifications can be made without narrowing the scope of the invention.
. The frame I can with expediency be formed of several strips glued together as is shown in Figs. 3 to 5.
In order to be able to give the frame I a relatively thin cross section, but nevertheless to give it a high power of resistance, said frame, as can be seen from Fig. 4, can be provided with an insert of resistant material such as a band ill of steel or a corrosion resistant aluminum alloy.
The alternative according to Fig. 5 differs from that shown in Fig. 4 essentially by the strengthening insert Hi being provided bilaterally on each side thereof with a narrow rib II. The circumferential edges of the ribs H are with expediency attenuated so that on pressing together the frame formed of several strips said ribs are forced into the adjacent strips whereby a particularly solid bond is achieved.
What I claim and Wish to secure by Letters Patent is:
In a tennis racket or the like a frame, said frame having inner and outer grooves therein, said inner and outer grooves opening into one another, said outer groove being open to the outside of said frame, said inner groove being narrower than said outer groove, said frame having a plurality of openings therethrough from the inner side of said frame to said inner groove, strings inserted through said openings and seoured to said frame, said strings bein in contact with the inner surface of said inner groove and resting in said inner groove, a covering strip inserted in said outer groove and secured to said frame, said outer groove comprising a seating for said covering strip.
EMIL TRIBELHO'RN.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 364,596 Luce June 7, 1887 1,156,340 Bancroft Oct. 12, 1915 2,004,609 Johnston June 11, 1935 2,335,629 Audreef Nov. 30, 1943
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US44810A US2552020A (en) | 1948-08-18 | 1948-08-18 | Tennis racket |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US44810A US2552020A (en) | 1948-08-18 | 1948-08-18 | Tennis racket |
Publications (1)
Publication Number | Publication Date |
---|---|
US2552020A true US2552020A (en) | 1951-05-08 |
Family
ID=21934454
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US44810A Expired - Lifetime US2552020A (en) | 1948-08-18 | 1948-08-18 | Tennis racket |
Country Status (1)
Country | Link |
---|---|
US (1) | US2552020A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3625512A (en) * | 1968-01-26 | 1971-12-07 | Peter A Latham | Extruded racket having two seamless hollow tubes formed with an interconnecting web |
US4348025A (en) * | 1980-01-24 | 1982-09-07 | Half Court Tennis Pty. Limited | Racquet |
USRE31224E (en) * | 1976-10-15 | 1983-05-03 | Leach Industries, Inc. | Metal-plastic composite racquet |
US5280907A (en) * | 1992-10-26 | 1994-01-25 | Leueis Liu | Protective casing for a game racket |
US20070087871A1 (en) * | 2005-10-14 | 2007-04-19 | Giannantonio Douglas M | Dual-stringing conversion and playing surface separation ring for sports racquet |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US364596A (en) * | 1887-06-07 | Construction of tennis-rackets | ||
US1156340A (en) * | 1915-07-07 | 1915-10-12 | Frederick J Bancroft | Tennis-racket. |
US2004609A (en) * | 1932-03-21 | 1935-06-11 | Johnston Harry | Tennis racket |
US2335629A (en) * | 1941-09-23 | 1943-11-30 | Alexis D Andreef | Tennis racket |
-
1948
- 1948-08-18 US US44810A patent/US2552020A/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US364596A (en) * | 1887-06-07 | Construction of tennis-rackets | ||
US1156340A (en) * | 1915-07-07 | 1915-10-12 | Frederick J Bancroft | Tennis-racket. |
US2004609A (en) * | 1932-03-21 | 1935-06-11 | Johnston Harry | Tennis racket |
US2335629A (en) * | 1941-09-23 | 1943-11-30 | Alexis D Andreef | Tennis racket |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3625512A (en) * | 1968-01-26 | 1971-12-07 | Peter A Latham | Extruded racket having two seamless hollow tubes formed with an interconnecting web |
USRE31224E (en) * | 1976-10-15 | 1983-05-03 | Leach Industries, Inc. | Metal-plastic composite racquet |
US4348025A (en) * | 1980-01-24 | 1982-09-07 | Half Court Tennis Pty. Limited | Racquet |
US5280907A (en) * | 1992-10-26 | 1994-01-25 | Leueis Liu | Protective casing for a game racket |
US20070087871A1 (en) * | 2005-10-14 | 2007-04-19 | Giannantonio Douglas M | Dual-stringing conversion and playing surface separation ring for sports racquet |
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