SU1304829A1 - Appliance for tensioning strings of tennis racket - Google Patents

Abstract

The aim of the invention is to improve ease of use. The device contains a spongy floating string clamp mounted on the lower arc of its holder on a racket rim with the possibility of moving along it and contacting the upper arc during tension on the string. The holder arcs are interconnected by a vertical bridge on one end, and on the other ends there are loops for placing the means for fixing the holder on the rim of the racket, executed in the form of an eccentric clamp. On the jumper arc set their center. When stringing the string, the string passes through the clamp and the pointer of their center is always parallel to other branches of the racket plane strings due to the possibility of relative displacement of the clamp, string and holder located on any part of the rim. 2 hp f-ly, 9 ill. 00 about 4 00

Description

This invention relates to sports equipment.

The aim of the invention is to enhance the operational capabilities by providing string tension on racquets of various shapes with different pitch between strings.

Pa figs. 1 shows a diagram of a device for tensioning strings on tennis rackets, top view; Figure 2 is the same side view; in fig. 3 - safety strut; in fig. 4 - adjustment crank; in fig. 5 - bracket for fastening the racket; in fig. 6 is a diagram of the operation of the support element with a clip for the strings; in fig. 7 - construction of the support element and its parts; in fig. 8 shows a string clip assembly; in fig. 9 - the same, view along arrow A.

Tension racket enters the device for stretching strings (when tensioning on a stationary wall): a safety strut (Fig. 1-3), is performed; from the tube 1, at one end of which a fixed supporting cheek 2 is fixed, and in the other a round rod 3 is inserted with a second, movable supporting cheek 4 fixed on its protruding end.

The rod is threaded to move the nut 5 with the centering cylindrical part resting on the open end of the pipe. At the end of the rod that enters the pipe, there is a cylindrical buj-slider 6 fixed, centering the position of the rod along the axis with the nut.

The working length of the spacer — the distance L between the supporting cheeks (.fig.c) is changed by rotating the nut, which moves the rod with the movable cheek relative to the pipe with the fixed cheek.

Calibration knob (.fig. 4) for string tensioning is manually made from pipe 7, covered with friction material B (leather, leather, leather, durite, etc.) Two heads are inserted into the pipe ends, One, fixed head in the pipe 9 and opposite rotating tube inside it, the head 10 through which the circular cross member 11 freely passes to rotate the knob. Inside the pipe, between the cuts in the heads, a flat, torsion-loaded, spring-loaded spring 12 is clamped. When the string is pulled.

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wound on the twist, by rotating the pipe through the crossmember, a torque is transmitted to the pipe through a spring, which then twists itself, depending on its size, through a certain angle, measured by linear movement of the projecting part of the head 10 relative to the pipe 7. On the head 10 and the adjacent pipe end is marked with a scale indicating the tension force of the string directly in kilograms.

The bracket for fastening the racket 13 (2 pcs) shown in FIG. 5, sheet metal bent, rectangular, and screwed to a table or some other support such as a bench, board, or the like. two screws. A hole is made on the upper jumper of the bracket, against which the nut 14 for the clamping bolt 15 is fixed to the underside of the washer. When the bolt is screwed in, its lower end abuts against the gasket 16, which presses the racket handle onto the table. On the lining 16 on top there is a low ring 17, centering the lining along the axis of the bolt.

The string tightening device itself contains support elements 1b with means for fastening them on the racket rim and two clamps for strings 19 mounted on them (Fig. 6). Each support element 18 consists of two single-sided one half-rings interconnected by one ends through vertical jumper. The other ends of the half-rings are bent in the form of two loops, inside which a ha 20 extends, carrying an eccentric with a handle 21 for fastening the supporting elements 18 in any position and position on the rim of the racket and parallel moving the pads 22.

On the vertical jumper, the center half pointer is freely mounted, made in the form of a leather lining 23, which protects the racket rim from damage by strings winding on the knob during tension. The lining 23 has a length equal to the radius of the half rings and is intended to set their center against the hole in rim through which the string passes.

On round 20, two round washers 24 and locking pads 22 are worn. These pads, wrapped around the skin on both sides, slide against one another, on the sleeves 25 rigidly sealed in them, which provide perpendicularity of the planes of the pads to the thrust axis. Such a design of the pads 22 (Fig. 6) protects the loops and half rings from distortions when it is locked by the cam 21.

At the lower end of the pull, a thread is made and a round nut 26 is installed, by means of which the working length of the pull is adjusted and, therefore, the force of the eccentric locking the supporting element is pressed. This adjustment allows the rim to be curled in various thicknesses.

The clamp for strings 19 (fig. 1,6,8,9) consists of two free-floating plates 27 and 28, clamping the string 29 and interconnected by two adjusting screws 30 and 31, an expanding eccentric lever 32, and a hook latch 33 s rubber ring 34.

The plate 27, which is flat along the entire length, is screwed and the lock lock with lock washers with spring washers are two adjustment screws: the support screw 30 and the stop screw 21 The working length of the support screw 30 (.depends on the depth of its screwing into the plate 27) is determined by the diameter of the tensioning screw and the working length of the stop screw 31, which is the movement limiter of the plate 28, is adjusted depending on the chosen force of clamping the strings between the plates.

At the lower end of the plate 28, an eccentric lever 32 is mounted on the axis 35, which with its eccentric end expands the lower ends of the plates 27 and 28 and clamps, in this case, the tensioned string with the upper ends of the plates having along one slot (.two teeth) for the passage of the string, traversing, stretchable.

Plate 28 has smooth holes with small gaps for the passage of screws 30 and 31 and with respect to plate 27 is a free-floating, always self-aligning pressure plate parallel to the axis of the string to be pulled.

For complete purity of the kinematic string clamping scheme, body from 0 to 0

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the surface (sliding along the plate 27) of the eccentric end of the lever 32 (Fig. 9) is made round the corner, as shown in section. I-i of this figure. This ensures the free rotation of the pressure plate 28 relative to its longitudinal axis passing through the screws 30 and 31. Between the plates 27 and 28, on the restrictive stop screw 31, a thin hook-latch 33 is inserted, the toe of which is always pressed by the rubber ring 34 to the long end faces of the plates. 5 This latch hook holds the string clamp on the support element while the lever 32 is lifted up, i.e., when the support element of the arc is finally installed and the tension is not yet squeezed between the plates 27 and 28.

Tensioning of longitudinal, transverse or any inclined strings can be performed using the force generated by 5 in any way.

To pull a large number of rackets, for example, at a factory, you can use the power of gravity of the selected load or the power of a hydraulic drive, just as it is now done in existing devices. . The string is wound on a rotating drum with a ratchet of any design, which, under the action of a certain torque applied to it, pulls the string with the desired force.

Under urgent repair conditions or when 9KKs of a small number of rackets are retracted (conditions of non-resident competitions), stringing is easiest to perform the usual crank (calibration or hard) due to the master's muscular strength.

The main difficulty in tensioning shady racquets (very difficult and cumbersome to solve in existing devices) is to securely fasten on the rim of the tensioned section of the string and then relieve the rest of its length from the load without any local damage to both the string and the rim. rackets.

This task is solved by the proposed device in the following sequence;

Before string tensioning, it is recommended to fasten the rim with two brackets to secure the racket 13 to the selected work station, as shown in

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FIG. 1. Minor repairs, and even full tensioning, can be done without securing the racket on your hands, but this is less convenient.

It is recommended to wrap a racket handle for protection against local damages in the clips 13 with a strip of felt, cloth, or the like. a soft material (or put 13 soft safety pads in the brackets).

Depending on the thickness of the rim of the tensioned racket, the working length of the string 20 is adjusted with the help of the round nut 26 (Fig. 7), which determines the force of the clamping of the rim between the gaskets 22 when turning the eccentric Z1.

The tensioned string is freely passed through the rim mounted on the safety strut 1, and the support element 18 (Figs. 1 and 6) freely mounted on the rim.

Using a leather lining 23 (Figs. 1, 6 and 7), the supporting element 18 is pre-set in such a way that the tensioned string passes approximately through the center of the semirings.

After the semi-rings are pre-installed on the string, an open clamp for strings 18 is worn (lever 32 in the upper position of Fig. 9), which is centered on the string on the support element with a hook-latch 33, which automatically clicks into place on the lower semi-ring.

After weighting a string clamp on the half-rings, the supporting element, together with the clamp, is finally installed on the racket rim, depending on the specific location of the intersection point of the tensioned string with the string that crosses it closest to the rim. This is accomplished by moving the half rings inside the loops up to the stop against the rim of a 2U rod with pads 22 and an eccentric 21 (Fig. 6 and 7). Making sure that the side faces of the plates 27 and 28 (Fig. 8, 9) are symmetrically touched on the half-rings, the support element is fixedly mounted on the rim by turning the eccentric 21.

After this, the string is tensioned by the winding wheel (or in some other way) and tensioned with the desired force, the string is clamped between the plates 27 and 28 by moving the lever 32 to the lower position (as far as the plate 28 stops the restrictive screw 31) (Fig. 9) .

Further, the knob is released and the unloaded end of the string is passed through the next two holes in the rim. After stretching and securing the new section of the string on the opposite side of the rim with the help of the second support element and the second clamp for the strings (fig. 1, the first set is released and transferred to the next string and this process is repeated until the end of the stretching of the entire racket.

The string-tensioner is suitable for tightening various rackets, including rackets with thin-walled metal rims, of increased size, various shapes and with very delicate plastic caps in the holes for the strings

The device is easy to manufacture, ensures complete safety of the rim and strings of any design and is very portable (the total weight of the device in the experienced, artisanal manufacture is less than 1.5 kg).

formula of invention

Claims (3)

1. A stringing device for an Ennis racket, containing two string clamps, mounted on porous elements with the means of securing them on the racket's freeze, which is designed so as to enhance operational capabilities by providing stretching the strings on racquets of different shapes with different pitch between the strings, each the supporting element is designed as two half-rings arranged one under another, one ends of which are connected to each other by a vertical bridge, and the others have loops, each means for fixing the support element on the rim is mounted in half-ring loops and includes a pull that carries an eccentric with a handle , and two liners placed between the loops, and Each clip for a string is mounted on the lower half-ring with the possibility of contact with the upper half-ring during tensioning the string. 2. The device according to claim 1, This is due to the fact that the clip for the string contains two floating plates connected to each other by two adjusting screws, an eccentric lever and a hook-latch for connecting to the bottom half ring. 3. The device according to claim 1, characterized in that it contains pointer center half rings, made in the form of a lining of leather with a length equal to the radius of the half rings and installed freely on their vertical jumper. 18 Fm.1 21 FIG. 2 J2 guv 18 32 FIG. Editor , Compiled by Y. Galitsky Tehred M. Morgental Proofreader S. Cherni Order 5161 Circulation 411 VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Printed production enterprise, Uzhgorod, st. Prunektna, 4 Subscription