US2268276A - Racket stringing machine - Google Patents

Racket stringing machine Download PDF

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Publication number
US2268276A
US2268276A US275977A US27597739A US2268276A US 2268276 A US2268276 A US 2268276A US 275977 A US275977 A US 275977A US 27597739 A US27597739 A US 27597739A US 2268276 A US2268276 A US 2268276A
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United States
Prior art keywords
strings
lever
racket
rods
mains
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Expired - Lifetime
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US275977A
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English (en)
Inventor
Caro Martin
Lambet Gustave
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Individual
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Individual
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Publication date
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Publication of US2268276A publication Critical patent/US2268276A/en
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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
    • 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
    • A63B51/143—Hand-held string-tensioning devices
    • 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
    • A63B51/146—Devices simultaneously raising and lowering alternate longitudinal strings previously mounted in a frame, to facilitate the threading of the cross strings

Definitions

  • This invention relates to a device for stringing tennis, badminton, squash and like rackets.
  • a frame For stringing rackets a frame is usually used which has two movable Jaws which can be moved towards and away from each other and parallel to themselves by means of a screw and nut arrangement so that the frame of the racket to :be strung is held along its longitudinal axis and a rigid support for the racket is therefore provided during the stringing.
  • the machine in accordance with the invention which is very simple and at the same time very strong uses the principle of the above-mentioned frame which allows speed and regularity which are characteristic of mechanical operations to be combined with the numerous advantages of hand stringing.
  • the frame in which the racket is held is mounted on a vertical pivot so that the racket can be displaced parallel to itself in a horizontal plane as required.
  • a tensioning device can be used which consists of a graduated lever provided with a removable sliding counterweight which can be fixed to the lever by means of a screw in any desired position along the length of the lever according to the required tension.
  • a device for putting in the cross strings which overcomes the difficulties arising out of the inter-twining of these strings with the mains.
  • This device comprises rods which are controlled eccentrically and which serve to space the even mains away from the odd mains.
  • Figure l is a perspective view of the machine during the putting in of the cross-strings.
  • Figure 2 is an end elevation of the machine showing the parts which serve to hold the mains apart while the cross-strings are being passed between them.
  • Figure 3 is an elevation to a larger scale of the parts through which the strings are tensioned when only a light tension is required.
  • the corre sponding parts shown in Figure 1 are those used when a relatively high tension is required.
  • Figure 4 shows a flexible needle which is used for threading the cross-strings.
  • FIG. 5 shows the disposition of the cams through which the parts shown in Figure 2 are operated.
  • Figures 6 and 6a show the construction and operation oi certain parts shown in Figure 2.
  • Figure '7 is a perspective view of a clamp used when putting in the mains and Figure 8 is a view of a clamp used when putting in the cross-strings.
  • the machine shown in the drawings comprises essentially a frame in which the racket is rigidly held in a constant position during the stringing operation, a device for tensioning the strings. clamps for maintaining the tensioned strings under tension as the stringing progresses, a rigid supporting frame for' the said clamps and a device for holding the mains apart while the cross-strings are passed between them.
  • the frame in which the racket is held during the stringing (see Figure 1) has two jaws 2 which grip the frame of the racket in the direction of its longitudinal axis.
  • the racket is held in the jaws 2 by means of a screw 3 provided with a tongue land by means of a tongue 5 which is hinged to a part 6 which is removable from the rigid frame.
  • the tongue 5 is held by a bolt 1 which can be screwed into a hole in the member 6.
  • This frame is pivotally mounted on a fixed base 8 so that it, and therefore the racket, can be turned in different directions in a horizontal plane at dififerent stages duringthe stringing.
  • the tensioning device consists of a graduated lever 9 hinged at l0 and provided with a sliding counter-weight I2 which can be fixed to the lever by means of a screw l3.
  • a pawl i5 pivotally mounted at I4 on one of the faces of the lever B, engages, under the influence of a spring IS in the teeth of a sector fixed to the tensioning drum II.
  • the periphery of the drum II has a rubber coating i8 and is provided with a screw l3 and washer 20 to which the gut is fixed during the tensioning.
  • the other face of the lever 8 carries a slidin rod 2
  • a sector 23 which is urged into an inoperative position by means of a spring 24.
  • the sector 23 acts on the end of a pawl 25 mounted on a fixed pivot 26.
  • a stop 27 carried by the drum bears against the end 28 of the pawl 25 which is maintained in its locking position by means of a spring 29.
  • the support for the drum and for the tensioning lever slides along a guide forming part of the framework of the machine.
  • a device which lifts every other main and lowers the remaining mains.
  • This device will be referred to as the separating device. It comprises a set of rods 30 which are pivotally mounted at their ends 3i on two connecting members provided with circular collars serving as housings ited to the number of mains to be separated.
  • the hinged rods can be provided with a sliding sleeve 35 having an axial groove 35 formed in the faces of the sleeves at right angles to the axis of the openings or housings 31 in the rods.
  • a second groove 38 allows the gut to be introduced into the housing in the rod, the sliding sleeve being provided for preventing any possibility of pivotal movement of the upper hinged part of the rods situated near the ends of the separating device.
  • the mains are introduced into openings 31 of appropriate shape formed in the rods 30.
  • the apparatus is thus put in place, that is to say, suspended from the mains.
  • the eccentric cams are rotated and the rods of the separating device are simultaneously displaced longitudinally.
  • the asymmetric arrangement of the cams ensures the proper spacing in the longitudinal direction of the even strings relatively to the odd strings and vice versa.
  • the end of the gut is introduced into the eye of a flexible needle 40 the displacement of which is guided by the upper and lower mains.
  • the separating device The end of the string to be tensioned is then introduced into the eye of the needle which is pulled in the opposite direction, thus pulling the string which, after its introduction into the corresponding hole of the frame, can be tensioned in the same manner and with the same effectiveness as the mains without rubbing on the latter because they are drawn apart.
  • the gut is then wound round the tensioning drum and is wedged between the washer 20 and the flexible coating i 8.
  • the lever I9 is then liberated and is turned, carrying with it the tensioning drum 5?.
  • the tension in the gut increases until the lever reaches its horizontal position in which the moment of the counterweight i2 is at its maximum.
  • the desired tension is obtained by the displacement of the counterweight along the graduated lever.
  • the momentary releasing of the lever 9 from the drum i7 allows the point from which the lever 3 starts so as to arrive in the horizontal position to be determined. This starting point varies according to the length of the string to be tensioned and its elasticity.
  • the clamps ( Figures 7 and 8) comprise two Jaws 45 one of which is provided with a ramp 46 on which, according to its position, acts a cam 41. Thesetwo jaws are threaded on to a rod 43, one end of which is provided with a stirrup 42 which allows this rod to be placed astride any one of the rods of the rigid frame 44.
  • the usual counterweight I2 can be replaced by a lighter counterweight 48 ( Figure 3) and a lever 49 can be attached to the tensioning lever for compensating the weight of the lever 9 itself.
  • the lever 43 is provided with a notch which can be adjusted on the hinge pin of the tensioning lever and is driven by the latter through an abutment 50 forming part of the lever.
  • a mechanism for raising and lowering adjacent longitudinal strings to facilitate insertion of a transverse string comprising two sets 01' string-engaging elements, each of said elements having a lower member and an upper member pivotally mounted on the lower member, a sleeve carried by the upper member adapted to slide down over the lower member to maintain the upper and lower members in alignment and means for raising one set of said elements and for lowering the other set.
  • the flexible needle is slipped into the free space strings to facilitate insertion of a transverse string, comprising two sets of string-engaging elements, each of said elements having a lower member and an upper member pivotally mounted on the lower member, a sleeve carried by the upper member adapted to slide down over the lower member to maintain the upper and lower members in alignment, said sleeve having a longitudinal slot opening on one side at the bottom thereof for receiving a string, said slot being closed upon lowering of said sleeve and means for raising one set of said elements and for lowerin the other set.
  • a mechanism for effecting the spacing of longitudinal strings to facilitate the insertion of transverse strings comprising two series of string-engaging rods, one series for the even strings and the other series for the odd strings, a support, a shaft carried by said support, two sets of eccentric cams carried by said shaft, two connecting members, circular 2 4.
  • a mechanism for efiecting the spacing of longitudinal strings to facilitate the insertion of transverse strings comprising two series of string-engaging rods, one series for the even strings and the other series for the odd strings, a support, a shaft carried by said support, two sets of eccentric cams carried by said shaft, two connecting members, circular collars carried by the ends of said connecting members for mounting one member on one set of cams and the other member on the other set of cams, one series of said rods being pivotally mounted on one connecting member and the other series being pivotally mounted on the other connecting member, said string-engaging rods having lower parts and upper parts pivotally mounted on the lower parts, and sleeves slidable on the upper parts adapted to slide partly down on the lower parts to maintain the upper and lower parts of the rods in alignment, the upper parts of said rods having a notch in one side for receiving a string and said sleeves having a notch in one side corresponding to that of the upper part of the rods and extending longitudinally of the sleeves

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Preliminary Treatment Of Fibers (AREA)
US275977A 1938-05-31 1939-05-26 Racket stringing machine Expired - Lifetime US2268276A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE2268276X 1938-05-31

Publications (1)

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US2268276A true US2268276A (en) 1941-12-30

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Application Number Title Priority Date Filing Date
US275977A Expired - Lifetime US2268276A (en) 1938-05-31 1939-05-26 Racket stringing machine

Country Status (3)

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US (1) US2268276A (fr)
BE (2) BE428359A (fr)
FR (1) FR854899A (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3302950A (en) * 1965-12-07 1967-02-07 Wesley J Hartman Racket stringing machine
US3994496A (en) * 1973-03-26 1976-11-30 Paul James Burchett Sports racket stringing aid
US4082272A (en) * 1976-08-23 1978-04-04 Garver John P Tennis racket string positioning device
US4270752A (en) * 1978-10-07 1981-06-02 Edgar Strelow Reverser apparatus for tennis rackets
US4339131A (en) * 1980-12-08 1982-07-13 Balaban J A Racket stringing device
US4491322A (en) * 1983-07-11 1985-01-01 Heilman Karl J Tensioning apparatus for a racket-stringing machine
US4776591A (en) * 1986-01-08 1988-10-11 Ho Sai K Racket string straightener
US5222998A (en) * 1992-01-31 1993-06-29 Ferrari Importing Company Device for facilitating application of variable tension to sports racquet stringing bed
US7862455B1 (en) * 2008-04-30 2011-01-04 Alberto Ratmiroff Stringing sandwich, an apparatus that lays strings on top of each other within a frame of a racquet
US20150258389A1 (en) * 2014-03-17 2015-09-17 Vaclav Zdrazila Portable Tennis Racket Stringing Machine
US20190344129A1 (en) * 2018-05-08 2019-11-14 Vaclav Zdrazila Tennis Racket Stringing Tool

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE744743C (de) * 1941-07-24 1944-01-24 Robert Storch Mit Gewichtswirkung betriebene Tennisschlaegerbespannmaschine

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3302950A (en) * 1965-12-07 1967-02-07 Wesley J Hartman Racket stringing machine
US3994496A (en) * 1973-03-26 1976-11-30 Paul James Burchett Sports racket stringing aid
US4082272A (en) * 1976-08-23 1978-04-04 Garver John P Tennis racket string positioning device
US4270752A (en) * 1978-10-07 1981-06-02 Edgar Strelow Reverser apparatus for tennis rackets
US4339131A (en) * 1980-12-08 1982-07-13 Balaban J A Racket stringing device
US4491322A (en) * 1983-07-11 1985-01-01 Heilman Karl J Tensioning apparatus for a racket-stringing machine
US4776591A (en) * 1986-01-08 1988-10-11 Ho Sai K Racket string straightener
US5222998A (en) * 1992-01-31 1993-06-29 Ferrari Importing Company Device for facilitating application of variable tension to sports racquet stringing bed
US7862455B1 (en) * 2008-04-30 2011-01-04 Alberto Ratmiroff Stringing sandwich, an apparatus that lays strings on top of each other within a frame of a racquet
US20150258389A1 (en) * 2014-03-17 2015-09-17 Vaclav Zdrazila Portable Tennis Racket Stringing Machine
US20190344129A1 (en) * 2018-05-08 2019-11-14 Vaclav Zdrazila Tennis Racket Stringing Tool
US11097165B2 (en) * 2018-05-08 2021-08-24 Vaclav Zdrazila Tennis racket stringing tool

Also Published As

Publication number Publication date
BE431929A (fr) 1900-01-01
BE428359A (fr) 1900-01-01
FR854899A (fr) 1940-04-26

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