US3511502A - Machines for the stringing of tennis rackets - Google Patents

Machines for the stringing of tennis rackets Download PDF

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Publication number
US3511502A
US3511502A US704174A US3511502DA US3511502A US 3511502 A US3511502 A US 3511502A US 704174 A US704174 A US 704174A US 3511502D A US3511502D A US 3511502DA US 3511502 A US3511502 A US 3511502A
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United States
Prior art keywords
string
frame
cradle
stringing
racket
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Expired - Lifetime
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US704174A
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English (en)
Inventor
Rene Spenle
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SPENLE ET PIZZERA
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SPENLE ET PIZZERA
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    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B51/00—Stringing tennis, badminton or like rackets; Strings therefor; Maintenance of racket strings
    • A63B51/14—Arrangements for stringing, e.g. for controlling the tension of the strings during stringing

Definitions

  • the cradle carries an adjustable clamping device disposed below the racket frame and which may act on the said element close to the frame to maintain same under tension, whereby the string may be released from the tensioning means, threaded through another pair of perforations to form the next element and again tensioned after the cradle has been rotated through 180.
  • This invention relates to machines used for the stringing of tennis rackets.
  • the known stringing machines generally comprise a swinging counterweight mechanism adapted to tension the string which has just been passed through a pair of corresponding perforations of the racket frame in order to form one of the elements of the stringing (longitudinal or vertical elements and transverse or horizontal elements), while there is provided a clamping device which may clamp the string within the racket frame (i.e. the element being realized) close to the outlet perforation of the string (i.e. the perforation through which the free portion of the string issues from the frame). Once the element forming portion of the string is thus clamped and retained under tension, the free portion thereof may be released from the tensioning counterweight mechanism and passed through another pair of perforations of the racket frame.
  • the cradle which supports the racket frame is then rotated through 180 in order that the outlet perforation of the next stringing element may be situated in front of the counterweight mechanism and the operative cycle is repeated.
  • the clamping device must of course be disposed near the opposite side of the racket frame.
  • this clamping device is adjustably carried by a frame disposed above the cradle which supports the frame of the racket.
  • This position is an important dra'wback since the clamping device and its supporting frame hinder free access to the racket frame, more particularly when the operator has to dispose the horizontal or transverse elements which are to for the stringing of tennis rackets, of the kind comprising a rotatable cradle on which the frame of the racket to be strung is fixed, means for tensioning the string from which the stringing is to be made each time the said string has been threaded through a pair of perforations of the racket frame in order to form an element of the stringing, and a clamping device for retaining under tension each element of the stringing while the string is 3,511 ,502 Patented May 12, 1970 ice being threaded through another pair of perforations of the said racket frame in order to form another element of the stringing, the clamping device is carried by an adjustable support disposed below the racket frame mounted
  • FIG. 1 is a view in elevation of a stringing machine according to the invention, the parts being shown after the string has been threaded through a pair of perforations of a racket frame and has just been tensioned in order to form a first vertical element of the stringing.
  • FIG. 2 is a fragmental plan view corresponding to FIG. 1.
  • FIG. 3 is a view in elevation of the upper portion of the'machine the vertical element being clamped by the clamping device and the string being released from the tensioning device.
  • FIG. 4 is a fragmental plan view corresponding to FIG. 3, but showing the parts after the cradle has been rotated through
  • FIG. 5 is a fragmental plan view similar to FIG. 4, but showing the string threaded through another pair of perforations of the racket frame and submitted to the action of the tensioning device.
  • FIG. -6 is an axial section of the lower central portion of the cradle.
  • FIG. 7 is a view in elevation with parts in section showing the clamping device in the open condition.
  • FIG. 8 is a view similar to FIG. 7, but with the parts illustrated in the closed condition of the clamping device.
  • FIG. 9 is a section taken through line IX-IX of FIG. 8.
  • the machine comprises a vertical frame 1 which supports a horizontal table 2.
  • a base member 3 carried by table 2 is formed at one of its ends with an upstanding portion 3a on which a tensioning device is mounted.
  • the latter comprises a sector-shaped member 4 extending substantially through 180 and which is rotatably supported by a pin 3b secured to the upstanding portion 3a.
  • a guide 5 and a drum 6 are secured to the sector-shaped member 4, the axis of the guide being substantially parallel to the axis of pin 3b while the axis of the drum is substantially radial thereto.
  • the outer end of the said sector shaped member 4, carries a string retaining mechanism generally designated by reference numeral 7, this mechanism comprising a fixed jaw 7r: secured to member 4 and a movable jaw 7b pivoted to the member 4 at 4a and formed with an actuating extension 7c on which is hinged the upper end of a driving rod 8.
  • the lower end of this rod carries a flat lug 9 which is pivoted at 10a on an arm 10.
  • this arm 10 is rotatably supported at 1a by the frame 1 and it carries a counterweight 11 which is preferably adjustable in position.
  • Arm 10 may be raised by means of a flexible cable 12 which passes on a loose pulley 13 supportedby the lower side of table 2, its end being attached to an appropriate actuating pedal (not shown). It is thus possible to raise the arm 10 by means of this pedal in order to release the string retaining mechanism 7.
  • the base 3 At its end opposed to the upstanding portion 3a the base 3 is formed with a substantially circular boss 30 (FIG. 6).
  • a vertical shaft 14 is rotatably mounted'in this boss 3c, as by means of anti-friction bearings, the
  • the flat cylindrical support 15 has two diametrically opposed arms 19 which are secured thereto in any appropriate manner, as by welding. These arms are upturned, as shown in FIGS. 1 and 3 and each carries at its upper end an arcuate extension 19a situated in a horizontal plane, these extensions opening towards each other. Support 15, arms 19 and extension 19a thus form a cradle to which the frame of the racket to be strung may be secured. It will be noted that this cradle is somewhat resilient and may be elastically deformed to a slight extent during the stringing operation.
  • the racket frame may be maintained on the cradle by means of the usual clamps 20, as indicated in FIGS. 1 and 3. As shown in dash-and-dot lines in FIGS. 2, 4 and 5, the ratchet frame is disposed with its major axis substantially parallel to the common axis of the horizontal portions of arms 19.
  • the upper side of the fiat cylindrical support .15 (FIG. 6) carries an axial pin 21 on which is loosely mounted a horizontal arm 22 which may be locked in position by means of a nut 23 screwed on the threaded upper end of pin 21, this nut being provided with any kind of manual actuating member, such as a transverse bar, as shown.
  • the portion of pin 21 on which arm 22 is mounted is of smaller diameter than the threaded upper up of the said pin and it may slide in an axially elongated aperture 22a (FIG. 2) provided in the arm, this aperture being of button-hole shape, i.e. having at one of its ends and enlarged portion through which the threaded upper end of pin 21 may pass.
  • arm 22 may slide longitudinally on pin 21 and it may rotate with respect thereto without any exaggerated clearance.
  • This arm 22 carries at one of its ends a vertical socket 24 (FIG. 1) in which is pivotally and slidably mounted the tubular lower end of the support 25 of a clamping device.
  • the upper end of support 25 is in the form of an upwardly opening fork.
  • a fiat member 26 To the inner side of one of the branches of this fork is secured a fiat member 26 the upper edge of which is integral with a number of downwardly bent fingers 26a adapted to form the fixed jaw of the clamping device.
  • This fixed jaw cooperates with a movable jaw comprised of a number of flat vertical teeth 27a, each adapted to engage the hook-like bent portion of a finger 26a, as best shown in FIG. 9.
  • Teeth 27a are formed along the upper edge of a plate 27 adapted to slide against the flat member 26.
  • Plate 27 is integral with a rod-like guiding tail 27b which is axially slidable in support 25.
  • Plate 27 also carries a transverse pin 27c on which is hinged an actuating lever 28. The latter is pivoted at 28a to one end of a link 39.
  • the other end of link 39 is hinged on a pin 30a eccentrically carried by a gudgeon 30 which may be locked at any suitable angular position in support 25, as for instance by a set screw (not shown).
  • the frame A (FIG. 1) of the tennis racket to be strung is first secured onto the cradle 19-19a by means of the clamps 20.
  • the string, previously attached to the ratchet frame A is threaded through a suitable pair of perforations of the frame and passed on the guide 5, and it is Wound several times on the drum 6, the operator having previously actuated the pedal of the machine in order to raise the counterweight 11, whereby the jaws 7a, 7b have been opened and the sector-shaped member swung towards the left in FIG. 1 (position of the jaws and of the sector-shaped member as illustrated in FIG. 3).
  • the operator may thus dispose the string between the jaws. He then releases the pedal to liberate the counterweight 11, which has for its result that the string is clamped between jaws 7a, 7b and that it is tensioned owing to the torque which the counterweight imparts to member 4 and which tends to rotate the latter clockwise in FIG. 1.
  • the parts thus assume the position illustrated in FIGS. 1 and 2.
  • the string element under consideration is parallel to the major axis of the racket frame and it forms therefore what may be called a vertical element of the stringing.
  • the vertical element being thus firmly retained by the clamping device, he may release the jaws 7a and 7b by means of the pedal, as aforementioned, without the element loosing tension, more particularly owing to the resiliency of arms 19 which have been slightly bent towards the right during the tensioning process and now act as blade springs tending to return the racket frame towards the left.
  • the string is thus released between jaws 7a, 7b and the racket frame A (position of FIG. 3), and it may be threaded through the next pair of perforations of the frame for the realization of another vertical element of the stringing.
  • lever 18 is actuated as indicated by the corresponding arrow in FIG. 4, so as to release the support 15 of the cradle (FIG. 6), the said lever 18 being thereafter operated in the reverse direction to lock support 15 together with the cradle and the racket frame at the new position (which is the position illustrated in FIG. 4).
  • the string may be threaded through the next perforations to form the next vertical element of the stringing, and it may be clamped between jaws 7a, 7b and tensioned under the action of the counterweight, as above explained.
  • the parts then assume the position illustrated in FIG. 5.
  • the pedal has been actuated in order to open jaws 7a, 7b and to swing the sector-shaped member 4 towards the cradle (FIG. 3); then the string has been passed on guide 5, around drum 6 and between jaws 7a, 7b, and the pedal has been released to tension the string as indicated in FIG. 1.
  • the support 25 of the clamping device may again be brought under the end portion of the new vertical element nearest to the sector-shaped member 4 and the operative cycle may be repeated.
  • the string ing of a racket frame may be easily and rapidly effected, all the elements of the stringing being evenly tensioned.
  • the clamping device 26-27 of FIGS. 7-9 may always be brought close to the racket frame whatever may be the shape and the dimensions thereof.
  • the elements of the stringing may be disposed at any orientation, as for instance diagonally, if desired.
  • a machine for the stringing of tennis rackets having a frame provided with pairs of perforations for passage of a string which forms an element of stringing between the perforations of each pair, said machine comprising a main frame, a cradle rotatable on said main frame about a substantially vertical axis and on which the frame of the racket to be strung is fixed, means on said main frame to lock said cradle thereon, releasable string tensioning means carried by said main frame to grasp and to tension a string threaded through a pair of perforations of the racket frame supported by said cradle to form one element of the stringing of said racket, said means acting on the portion of said string exterior to said racket frame, a clamping device disposed below said racket frame to maintain said one element under tension when such string tensioning means are released, and means to adjustably secure said clamping device to said cradle, said cradle having a substantially fiat lower base situated below said racket frame mounted upon
  • said clamping device having a depending tail portion and said vertical member of said flat arm being in the form of a socket to adjustably receive said tail portion.
  • a machine for the stringing of tennis rackets having a frame provided with pairs of perforations for passage of a string which forms an element of the stringing between the perforations of each pair, said machine comprising a main frame, a cradle rotatable on said main frame about a substantially vertical axis and on which the frame of the racket to be strung is fixed, means on said main frame to lock said cradle thereon, releasable string tensioning means carried by said main frame to grasp-and to tension a string threaded through a pair of perforations of the racket frame supported by said cradle to form one element of the stringing of said racket, said means acting on the portion of said string exterior to said racket frame, a clamping device disposed below said racket frame supported by said cradle to act on said one element close to said racket frame to maintain said one element under tension when said string tensioning means are released, and means to adjustably secure said clamping device to said cradle,
  • a machine for the stringing of tennis rackets having a frame provided with pairs of perforations for passage of a'string which forms an element of stringing between the perforations of each pair, said machine comprising a main frame, a cradle rotatable on said main frame about a substantially vertical axis and on which the frame of the racket to be strung is fixed, means on said main frame to lock said cradle thereon, releaseable string tensioning means carried by said main frame to grasp and to tension a string threaded through a pair of perforations of the racket frame supported by said cradle to form one element of the stringing of said racket, said means acting on the portion of said string exterior to said racket frame, a clamping device disposed below said racket frame supported by said cradle to act on said one element close to said racket frame to maintain said one element under tension when said string tensioning means are released, and means to adjustably secure said clamping device to said cradle, said clamping device compris
  • said actuating means being in the form of an adjustable rod-and-lever gearing forming an overcenter mechanism.
  • a machine for the stringing of tennis rackets having a frame provided with pairs of perforations for passage of a string which forms an element of the stringing between the perforation of each pair, said machine comprising a main frame, a cradle rotatable on said main frame about a substantially vertical axis and on which the frame of the racket to be strung is fixed, means on said main frame to lock said cradle thereon, releasable string tensioning means carried by said main frame to grasp and to tension a string threaded through a pair of perforations of the racket frame supported by said cradle to form one element of the stringing of said racket, said means acting on the portion of said string exterior to said racket frame, a clamping device disclosed below said racket frame supported by said cradle to act on said one element close to said racket frame to maintain said one element under tension when said string tensioning means are released and means to adjustably secure said clamping device to said cradle,

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Clamps And Clips (AREA)
  • Basic Packing Technique (AREA)
  • Medicines Containing Material From Animals Or Micro-Organisms (AREA)
US704174A 1967-02-22 1968-02-08 Machines for the stringing of tennis rackets Expired - Lifetime US3511502A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR48320A FR1521444A (fr) 1967-02-22 1967-02-22 Perfectionnements aux machines pour le cordage des raquettes de tennis et analogues

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US3511502A true US3511502A (en) 1970-05-12

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US704174A Expired - Lifetime US3511502A (en) 1967-02-22 1968-02-08 Machines for the stringing of tennis rackets

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US (1) US3511502A (es)
BE (1) BE707679A (es)
CH (1) CH490865A (es)
DE (1) DE1578655C3 (es)
FR (1) FR1521444A (es)
GB (1) GB1183146A (es)
SE (1) SE336292B (es)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3635080A (en) * 1968-05-31 1972-01-18 Court & Slope Inc Racket-stringing machine with automatic locking
US3823609A (en) * 1973-01-15 1974-07-16 Tremont Res Co Inc String tensioning mechanism
US3918713A (en) * 1974-03-15 1975-11-11 Bernard Kaminstein Racket stringing machine
US3988022A (en) * 1975-06-04 1976-10-26 Tennis Machines, Inc. Racket stringing machine
US4130278A (en) * 1977-06-21 1978-12-19 Gutzwiller Robert L Racquet stringing machine
US4348024A (en) * 1979-02-12 1982-09-07 Balaban J A Racket stringing apparatus and method
US4846474A (en) * 1987-08-17 1989-07-11 Chiang Chinn Chann Swivel glide bar rail table for a racquet stringing machine
US5590877A (en) * 1996-05-07 1997-01-07 Ho; Ping-Sen Racket string bracing apparatus
US5908362A (en) * 1997-02-11 1999-06-01 Ferrari Importing Company Tensioning device for stringing sports racquets having a string guide for maintaining constant string line of action to string gripper
US6093121A (en) * 1998-10-27 2000-07-25 Bishop; Jonah C. Swivel clamp for racket stringing

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2533831A1 (fr) * 1982-10-05 1984-04-06 Babolat Maillot Witt Dispositif de pince mobile pour machine pour le cordage de raquettes de tennis et similaires
FR2551351A1 (fr) * 1983-09-02 1985-03-08 Froger Pere Fils Gendre Sa Dispositif de retenue de la tension d'une corde, notamment lors du cordage d'une raquette de tennis

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2043813A (en) * 1934-09-04 1936-06-09 Saladino Joseph Racket string tightening machine
US2309849A (en) * 1940-07-29 1943-02-02 Rudolph A Kausal Racket stringing device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2043813A (en) * 1934-09-04 1936-06-09 Saladino Joseph Racket string tightening machine
US2309849A (en) * 1940-07-29 1943-02-02 Rudolph A Kausal Racket stringing device

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3635080A (en) * 1968-05-31 1972-01-18 Court & Slope Inc Racket-stringing machine with automatic locking
US3823609A (en) * 1973-01-15 1974-07-16 Tremont Res Co Inc String tensioning mechanism
US3918713A (en) * 1974-03-15 1975-11-11 Bernard Kaminstein Racket stringing machine
US3988022A (en) * 1975-06-04 1976-10-26 Tennis Machines, Inc. Racket stringing machine
US4130278A (en) * 1977-06-21 1978-12-19 Gutzwiller Robert L Racquet stringing machine
US4348024A (en) * 1979-02-12 1982-09-07 Balaban J A Racket stringing apparatus and method
US4846474A (en) * 1987-08-17 1989-07-11 Chiang Chinn Chann Swivel glide bar rail table for a racquet stringing machine
US5590877A (en) * 1996-05-07 1997-01-07 Ho; Ping-Sen Racket string bracing apparatus
US5908362A (en) * 1997-02-11 1999-06-01 Ferrari Importing Company Tensioning device for stringing sports racquets having a string guide for maintaining constant string line of action to string gripper
US6093121A (en) * 1998-10-27 2000-07-25 Bishop; Jonah C. Swivel clamp for racket stringing

Also Published As

Publication number Publication date
DE1578655C3 (de) 1979-10-11
CH490865A (fr) 1970-05-31
FR1521444A (fr) 1968-04-19
DE1578655B2 (de) 1979-03-01
GB1183146A (en) 1970-03-04
DE1578655A1 (de) 1971-08-12
SE336292B (es) 1971-06-28
BE707679A (es) 1968-04-16

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