JPH03159666A - Fastening metal fitting for use in device for netting racket gut - Google Patents

Abstract

PURPOSE: To improve a clamping metal fitting by providing such a structure as most suitably performing the holding and loosening of a gut and a guide bar by a vice member by the opening and closing the vice member by toggle effect in racket stringing work. CONSTITUTION: A clamping metal fitting 18 is formed of a top vice member 22 and a bottom vice member 24, both the vice members have fingers 26 for clamping a gut 19 on the upper ends, and mutually opposed semicircular grooves on the lower ends, and the grooves hold a slide bar 20 when the fitting 18 is in the closed position. The fitting 18 is operated by a handle member 28, one end of the handle member 28 is held by one end of a link mechanism 34, and the other end of the mechanism 34 is fixed to a bottom connecting pin 38. In the closed position of the fitting 18, the notch 47 of the member 28 is engaged with a locking pin 36 and pivotally supported thereby. The width of the clearance 17 between the vice members 22, 24 is regulated by a gap pin 54 when the fitting 18 is in the open position. The pressing force in the mutual contact state of the vice members 22, 24 is regulated by a regulating screw 40.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to toggle fasteners. More particularly, the present invention relates to a toggle string tensioner for maintaining tension on a racket during string tensioning in a racket tensioner. In particular, the present invention can be moved to different positions on the bar and subsequently clamped tightly onto the bar and moved onto the adjacent racket string, thereby during the tensioning process when the racket string is tensioned. The present invention relates to a string fastener used for supporting a racket string tensioning device on a guide bar, which holds the string tension generated in the string.

BACKGROUND OF THE INVENTION Gutted racquets are used in a wide range of sports, including the propulsion of a game ball by impact with the racquet's strung surface. The natural flexibility of the racquet gut advantageously attenuates the impact force on the user's arms and wrists, greatly governing the power utilization and directional control imparted onto the ball struck by the racquet. . Because of such features, strung rackets have always been very popular and are employed in games such as tennis, squash, and badminton.

Gutted racquets, on the other hand, are well suited for such games, and they are free from normal wear and tear, including the natural tendency of the strings to stretch due to accidental or repeated impacts to which they are subjected, as the case may be. Guts must be re-gutted as a result of gut damage. The process of re-stretching the strings is usually carried out in a racket tensioner where the strings are moved back and forth across the racket under tension. Tension is maintained during the stringing process by a string clamp that tensions the string as it moves back and forth within the area of the racquet frame during the stringing process, thus preventing undesired loosening of the string.

In the past, a variety of fasteners have been used for such purposes, including those in which the fixation of the fastener to the string tensioning device and the string itself is typically accomplished by a cam provided in a clamping mechanism. Unfortunately, however, the tightening action performed by the cam is not relatively smooth, and it is difficult to properly regulate the correct value of the pressing force on the part of the device to which the fastener is attached and on the racket. Among other adverse effects resulting from the lack of such regulation:
The fact is that wear on certain parts of the string tensioning device increases and undesirable unstable tensioning of the strings occurs.

(Section B of the Invention) A first object of the present invention is to provide an improved fastener for a racket string tensioning device.

A second object of the invention is to provide a clamping device for a racket gun tensioning device which allows easy adjustment of the clamping force by means of a hinge.

An additional object of the invention is to provide a partial opening of the guide bar clamping end of the fastener, at the same time that the finger or gas clamping end is loosened to allow free movement of the fastener on the guide bar during positioning. That's true.

It is a further object of the invention to provide a fastener for a rack tensioner that compensates for the wear of the fastener and its manufacturing tolerances, and to provide means by which the gripping force can be equalized along the fingers.

Another object of the present invention is to enable easy removal or movement on the slide bar of the racket string tensioning device to which the tightening body levers are attached when they are engaged or disengaged. It is an object of the present invention to provide a fastener for a racket string tensioning device that opens automatically.

It is an additional object of the present invention to provide a fastener for a racket string tensioning device that is simple, includes mechanical components that withstand heavy loads and long-term wear, and provides an extremely reliable fastener mechanism. It is.

(Means for Solving the Problems) A preceding and additional problem of the present invention is to provide a fastener for a racket string tensioning device, namely a racket A toggle fastener for a string tensioning device, comprising a finger-shaped projection extending from one end of the vise member along the longitudinal axis of the member, and a semicircular groove located at the other end perpendicular to the longitudinal axis. a parallel top vise member and a bottom vise member having;
A handle member including a U-shaped portion and a gripping lever portion, an adjustable U-shaped wedge block, two spacer nuts, and two link members, wherein the link members fit into the slots of the vice member. The end portions of the link members are respectively pivoted to the potum vice member and the handle member by connecting pins, and the connecting pins connecting the handle members are connected to elongated holes in the U-shaped portion of the handle member. a connecting pin passing through the handle member also passing through the spacer nut;
One of the spacing nuts is located on each side of the handle member, and the wedge block is connected to the handle member by an adjustment screw and is located between the shoulders located on the handle member. and further the top vise member has a spout/knock pin located between the bottom vise member and the handle member and extending perpendicularly through a slot in the vice member;
The racket string tensioning device is characterized in that the U-shaped portion of the handle member is thereby capable of exerting a force against the locking pin, biasing the vice member when the clamp is in the closed position. Solved by fasteners for.

The foregoing and still additional object of the invention is achieved by a racket string tensioning device with a toggle string fastener corresponding to the preceding description.

(Function) According to the present invention, the string of the vise member and the guide bar are optimally gripped and loosened by opening and closing the vise member by toggle action during the racket string tensioning process.

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a tennis racket, generally designated 12, on which the racket is strung by a fastener IO for a racket string tensioner using a toggle type string fastener l8. As shown, the racquet string tensioning device includes a frame holder 14 that securely holds a racquet head or frame head 15 on the device. Fastener 18
is clamped at one end onto the slide bar or guide bar 20, while the other end of the fastener is clamped onto the racket gasket 19.

Tension head 16 is used to apply tension on the string during the string tensioning process. After threading the string through one end of the racquet head 15, one fastener is tightened onto the string adjacent to the frame, and the free end of the string is passed through the opposite end of the racquet head against the tension head. The string is then pulled to a predetermined tension, and other fasteners are tightened to the untightened end of the string to maintain tension in the string. The racket is then rotated 180° in the device and the second
The string is tensioned by a tension head. The fastener is then loosened and moved to the opposite end of the slide bar adjacent the frame head. This process is repeated as above until all the strings are threaded through the frame and properly tensioned. The original slide bar is removed and set perpendicular to its original position, and the stringing process is repeated until the racquet is fully strung to center the strings perpendicular to the one originally set. Ru.

FIG. 2 shows the toggle string fastener 18 in the open position. The illustrated fastener consists of a top vise member 22 and a bottom heiss member 24, both of which are provided with fingers 26 for clamping the string at the upper end of the vise member and opposite semicircular grooves at the lower end. The groove is adapted to grip the slide par 20 when the fastener is in its closed position. The fastener is operated by a handle member 28 which is held at one end of a linkage 34 and the other end of the linkage is secured to a bottom connecting pin 38. In the closed position of the fastener, the notch 47 of the handle member 28 engages and pivots against the locking pin 36. The width of the gap 17 between the vice members is regulated by a guide pin or gear drop pin 54 when the fastener is in the intervening position. The pressing force of the fastener when the vise member abuts is determined by the adjustment screw acting on the wedge block 30 between the spacer nut 32 and the shoulder located on the handle member 28, as will be explained in detail next based on the drawings. Adjusted by 40. As can be seen in FIG. 2, sufficient clearance is provided in the slide bar groove to allow complete removal of the fastener from the slide bar 20 when the fastener lever is in its fully open position. It is set between 60 and 60.

Figure 3 shows the relationship between them in detail.
Fig. 8 shows an exploded view of the constituent parts of No. 8. The figure shows top vise member 2
2 and a bottom vice member 24, both of which have a finger 49 at the upper end of the vice member and a slide bar groove 60 at the lower end. Advantageously, the opposite sides of the fingers are provided with a rough surface to improve friction on the racket string. On the other hand, the slide bar groove 60 can also have a rough surface, although the slide bar itself usually has a surface that does not require similar treatment of the groove surface. The high-speed steel member spring 56 is provided to help open the vise member when the fastener is not in its tightened state.
Guide pin 54 provides guidance for the vice member as it slides along when opened, maintains alignment of the vice member and limits the degree of opening. The handle member 28 consists of a gripping lever portion 42 and a U-shaped portion 41 integrally connected thereto. The U-shaped part 41 has an elongated hole 5L shoulder 45 located on its side and a notch 47 at the bottom of its leg. A wedge handle 62 is connected between the legs of the U-shaped portion, while a handle sleeve 44, typically made of a relatively soft material such as rubber or plastic, facilitates cushioning and manipulation of the handle. The handle member 42 is designed to slide over the handle member 42 in order to provide a comfortable grip. The handle member 28 is fixed to the top vise member 22 by a handle pin 46 and is prevented from coming off by a snap ring 48, and the pin passes through an elongated hole 51. The link member 34 advantageously has a link shape whose end portions form an obtuse angle with respect to each other and connects the handle member 28 with the bottom vise member 24 . One end of the link member 34 is fixed to the bottom vise member by a bottom connecting pin 38, while the other end is connected to the bottom vice member through which it passes. It is positioned by a dollar pin 46. The adjustment mechanism for the handle member 28 likewise consists of a spacer nut 32 held by a handle pin 46, which is connected to the wedge nut 6 by a wedge pin 50 with a low left naso 52 at its end.
It is attached to 2. The wedge spring 29 is the wedge block 3
0 and the wedge nut 62 to maintain a tight relationship between the mechanical parts. In a similar manner, the pin spring 33 is
is located between the tip of the U-shaped portion and the handle pin 46. The locking pin 36 is the top vise member 22
through the slot 27 of the handle member, and the handle member noso 4.
7 and serves as a support on which the handle is pivoted during the opening and closing functions.

The dimensions of the fastener and therefore the clamping portion thereof vary within a relatively wide range, but the vise member is 5 to 6 inches long and 1/2 inch wide.
172-2 inches and has a thickness of approximately 3/8-374 inches. In such a fastener, the handle member 2
8 is usually about 2 to 3 inches long handle portion 42 and about 90 degrees
It has a U-shaped leg between 1 and 1/2 inches in height that joins the handle member at an angle of . With reference to such fasteners, the link member 34 is approximately 1.3/4 to 2.1
/4 inch in length and preferably has a length of 12 mm between the link ends.
Connected as a unit with an angle of 5' to 135'. Wedge block 30 typically has an upper surface angled from approximately 15 DEG to 30 DEG to the lower surface and has a maximum height of 1/2 to 374 inches. Wedge blocks are conveniently approximately 3/4 to 1/4 inch long,
The width is approximately 1/2 to 1 inch. In such fasteners, the spacer nuts are typically square, with sides of approximately 1/2 inch and approximately 3 mm located somewhat eccentric from the center.
/4 inch hole. Typically the hole is located approximately 2/10 of an inch from its nearest edge. Referring to the vice member, the diameter of the slide bar groove 60 depends on the diameter of the slide bar, and the fasteners typically include a groove having a diameter of approximately 9/16 inch.

A groove separation space is provided, which is approximately 1/2 inch wide. The guide pin 54 positioned by the snap ring 58 is usually approximately 3/4 from the tip of the finger 49.
~1 inch located, while for slide par? R60 is located 4 1/2 to 5 1/2 inches from there.

Due to the actual forces acting on the vise member, it is necessary that the vise member be made of a relatively strong material, typically metal, preferably an aluminum alloy for its corrosion resistant properties and light weight. Although work hardened steel shells may also be used.

FIG. 4 is a top view of the gut fastener l8 according to the present invention. The figure shows a top vice member 22 with a slide par groove 60 located at the lower end and including a groove separation area 61.

The handle member 28 is located between the spacer nuts 32 and all structural parts of the link member 34 are connected by handle pins 46.

On the other hand, the vise member does not necessarily have to include a groove separation area 61; the provision of such an area is useful for holding the fasteners in the desired position on the slide bar.
Allows high compressive forces per unit area to be placed on the a60.

FIG. 5 shows a side view of the gut fastener 18 taken along line 5--5 in FIG. The figure shows the torsion high speed member 22 and the bottom vice member 24, and also shows the relationship of the vice member spring 56 and the guide pin 54 to the vice member.

As shown in the illustration, the fastener should be attached to the top of the fastener.
It is fixed to the groove 19 and on the slide par 20 located between the grooves 60 for the slide bar at the lower end. Link member 3
4 is fixed to the bottom vise member 24 by a bottom vise member connecting pin 38 and to the handle member 28 by a handle pin 46. The link member 34 extends through the outer slot 35 of the hinge member 22, and the angular apex of the link member extends through the inner slot 31 of the hinge member.
It is adjacent to the lono kingpin 36 that passes through the ridge. As can be seen in the figure, the U-shaped portion 4
The nosochi located at the bottom of the first leg is located opposite the roto kingpin 36. The figure shows an adjustment screw 40 extending in the longitudinal direction.
and a wedge block 30 including a wedge spring 29. The wedge block is slidably positioned on the shoulder 45 by a sloped portion of the wedge block adjacent the groove 32.

As is clear from the figure, the purpose of the slot is to
4 passing through and accommodating the U-shaped member 41. On the other hand, the slots can be shaped in other ways, typically the inner slot 31 of the top vice member is 1-3 from one end of the fastener finger of the outer slot 35 of the top vice member.
/8 inches apart, and the outer slots are typically approximately 1 inch long and 1/8 inch wide. As mentioned above, the various pins used in fasteners typically have a diameter of approximately 3/3
It is 16 inches. Such pins and other movable parts of the fastener, other than the vice member, are advantageously made of hardened steel, and if the material of the high speed steel member is not aluminum, the vice member is of hardened steel.

Wedge blocks are a simple and durable method for adjusting the spacing between vice members as required to maintain specific clearances, gripping forces, etc. Operation of the wedge block is accomplished by rotating the adjusting screw 40 acting on the inclined plane of the block relative to the spacer nut 32, by moving the handle pin upwardly through the elongated hole 51 against the force of the pin spring 33, as clearly shown in FIG. Including pressing .

Due to the eccentricity of the hole in the groove hole 32, the fastener absorbs wear as well as unavoidable variations in the manufacturing tolerances of the fastener construction or parts and provides unique force adjustment from one side of the fastener finger to the other. do. Absorption of such forces is accomplished by rotating the spacer nut 32 until the desired side of the nut is located on the sloped surface of the wedge block providing the necessary clearance.

The locking action of the fastener is accomplished by the positioning of a notch 47 located at the bottom of the leg of the U-shaped portion 41 of the handle member 28 relative to the locking pin 36. A gripping lever portion 42 of the fastener is pivoted on a handle pin 46 to bring the apex of the link member 34 relative to the locking pin 36 into a position where the gripping lever portion 42 is parallel to the vice member. The toggle action described is to ensure that the nose tip is placed on the roto king pin, and the fastener is tightened with gut 19 and slide par 2.
Position the fastener in its gripping position on the 0. In such position, the fastener mechanism locks the locking pin 36.
and bottom vise member connecting pin 38 and link member 34
It is advantageous from the fact that it accommodates a four-point support with clamping loads at the contact points between.

FIG. 6 is another view of the gut fastener l8 of FIG. 4 showing details of the toss and bottom vise members 22 and 24, respectively, and includes a gap pin 54 and a vise spring 56 that maintain the alignment and opening gap of the vise members. shows.

The wedge block 30 rests on a shoulder 45 of a U-shaped portion 41 of the handle member which bears on the side of the spacer napft 32. As shown, pin spring 33 and handle pin 46 are connected to link member 34, spacer nut 32 and U-shaped portion 4l.

On the other hand, preferred embodiments and optimum conditions are shown corresponding to the patent status, and the scope of the present invention is not limited to the above description, but should be interpreted according to the claims.

(Effects of the Invention) With the fastener for the racket string tensioning device according to the present invention, the tension of the racket string can be maintained at a desired value during the racket string tensioning process, and the racket string tensioning work can be performed optimally.

[Brief explanation of the drawing]

FIG. 1 is a diagram of a tennis racket strung by a racket strut tensioning device using the fastener of the present invention;
FIG. 2 is a diagram of a toggle type gut fastener according to the present invention, FIG. 3 is an exploded view of the structural components of the fastener according to the present invention, and FIG.
5 is a side view of the fastener according to FIG. 4, and FIG. 6 is an end view of the fastener according to FIG. 4. ．． kA7( ”-7deo7, i7n Fig. 6

Claims (1)

[Claims] (1) A toggle-type fastener for a racket string tensioning device, which has a finger-shaped projection extending from one end of the vise member along the longitudinal axis of the member and a finger-shaped projection extending at right angles to the longitudinal axis located at the other end. a parallel top vise member and a bottom vise member having semicircular grooves; a handle member including a U-shaped portion and a grip lever portion; an adjustable U-shaped wedge block; two spacer nuts; two link members, the link members being located in the slots of the vice member, the end portions of the link members being pivoted to the bottom vice member and the handle member, respectively, by connecting pins. , a connecting pin connecting the handle members passes through an elongated hole in the U-shaped portion of the handle member, a connecting pin passing through the handle member also passes through the spacer nuts, one of the spacer nuts being connected to the handle member. on each side of the member, and the wedge block is connected to the handle member by an adjustment screw and is located between the shoulders located on the handle member, and further on the top vise member. has a locking pin located between the bottom vise member and the handle member and extending perpendicularly through a slot in the vice member, such that the U-shaped portion of the handle member allows the fastener to A fastener for the racket string tensioner, characterized in that the vice member can be biased to exert a force against the locking pin when in the closed position.