CA2002731A1 - A procedure for stringing racquets used for ball games and an apparatus for carrying out this procedure - Google Patents
A procedure for stringing racquets used for ball games and an apparatus for carrying out this procedureInfo
- Publication number
- CA2002731A1 CA2002731A1 CA 2002731 CA2002731A CA2002731A1 CA 2002731 A1 CA2002731 A1 CA 2002731A1 CA 2002731 CA2002731 CA 2002731 CA 2002731 A CA2002731 A CA 2002731A CA 2002731 A1 CA2002731 A1 CA 2002731A1
- Authority
- CA
- Canada
- Prior art keywords
- racquet
- string
- procedure
- tensioning
- thickened section
- 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.)
- Abandoned
Links
- 238000000034 method Methods 0.000 title claims abstract description 19
- 210000000078 claw Anatomy 0.000 claims description 18
- 238000002788 crimping Methods 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 2
- 238000005553 drilling Methods 0.000 claims 1
- 238000005259 measurement Methods 0.000 description 2
- 235000002723 Dioscorea alata Nutrition 0.000 description 1
- 235000007056 Dioscorea composita Nutrition 0.000 description 1
- 235000009723 Dioscorea convolvulacea Nutrition 0.000 description 1
- 235000005362 Dioscorea floribunda Nutrition 0.000 description 1
- 235000004868 Dioscorea macrostachya Nutrition 0.000 description 1
- 235000005361 Dioscorea nummularia Nutrition 0.000 description 1
- 235000005360 Dioscorea spiculiflora Nutrition 0.000 description 1
- 244000281702 Dioscorea villosa Species 0.000 description 1
- 235000006350 Ipomoea batatas var. batatas Nutrition 0.000 description 1
- AYFVYJQAPQTCCC-GBXIJSLDSA-N L-threonine Chemical compound C[C@@H](O)[C@H](N)C(O)=O AYFVYJQAPQTCCC-GBXIJSLDSA-N 0.000 description 1
- 235000004879 dioscorea Nutrition 0.000 description 1
- 229920000136 polysorbate Polymers 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
Landscapes
- Package Frames And Binding Bands (AREA)
Abstract
ABSTRACT
A procedure for stringing racquets for ball games, in particular tennis-type games, with individual strings is described, together with a tensioning device suitable for this purpose. Instead of gripping the smooth individual strings that have been introduced into the racquet on an edge of the racquet by means of clamping jaws for the purpose of applying the necessary tensile force, the tensile force is applied to a thickened section of the individual string. This makes it much simpler to grip and tighten the individual string than has formerly been the case. Also described is a tensioning device suitable for this purpose.
A procedure for stringing racquets for ball games, in particular tennis-type games, with individual strings is described, together with a tensioning device suitable for this purpose. Instead of gripping the smooth individual strings that have been introduced into the racquet on an edge of the racquet by means of clamping jaws for the purpose of applying the necessary tensile force, the tensile force is applied to a thickened section of the individual string. This makes it much simpler to grip and tighten the individual string than has formerly been the case. Also described is a tensioning device suitable for this purpose.
Description
21D~112731 The present invention relates to a procedure for stringing racquets that are used for ball yames, in particular tennis, with individual strings, and an apparatus for carrying out this process.
German utility patent G 86 24 960 describes an apparatus for stringing racquets with individual strings, this incorporating a section that can be applied to the edge of the racquet and a retaining section thak is applied to the inner edge o~ the racquet, and a tensioning device with a clamping system to hold the string. Furthermore, this incorporates a measuring system for indicating the degree o~ pretension that has been achieved, as well as an apparatus for crimping the rivet sle~ve onto the pretensioned strings.
A disadvantage here is that the individual string, which has been introduced from the opposite side o~ the racquet frame and threaded through strings that have been previously installed and then secured on the opposite edge side has to be threaded through the tension head of the tensioning device so as to have a tensile force applied to it by means of clamping jaws. This procedure, which can be re~erred to as a "thre~ding procedure" entails disadvantages in practice, because strin~ing a racquet with individual strings is intended to make it possible that the tennis player who has a string broken in his racquet can replace this broken string immediately and wherever the breakage occurs.
,, - . -: : . .
' ~C)OZ731.
It is the task of the present invention to propose a procedure for stringing a racquet for ball games, in particular tennis-type games, with individual strings, and, in addition, to describe an apparatus that can be operated very simply to achie~e this purpose.
In order to solve this task, the present inventi~n propo~es a procedure that entails the prccedural steps set out in the descriptive portion of patent claim 1. Because of the fa~t that the tensile force is in this instance applied to a thickened section of the individual string, there is no need for the tiresome threading of the string that was needed during the former procedure, since the tensile force can be applied by ~he action of a claw or the like and applied to the thickened portion of the string. The thickened portion of the string is thus not clamped, but is held loosely in the claw element. The individual string is not damaged by clamping elements when tensile force is applied to it and the individual strings can rotate prior to the application of any tensile force because of the initially loose positioning in the claw.
The thickened saction can be present from the very outset in an end area or in one end of the individual string. Then, prior to introducing the individual string into the racquet, it is necessary to first slip on a rivet sleeve such that the rivet 3~
head of the rivet sleeve is proximate to the thickened portion.
Then, a rivet ~leeve is clamped onto the "opposite" outer side o~
the racquet onto the individual string, whereupon tensile force is applied to the thickened section, the previously installed rivet sleeve is clamped tight, and then the tensile force is reduced so that the rivet sleeve, now secured in place, slips back into the drilled hole as a result of the remaining tension until such time as the rivet head lies against the edge of the hole, whereupon the string is under tension. All that is then required is to cut off that end of the individual string that incorporates the thickened section.
As an alternative, it is, of course, also possible to first introduce an individual string without a thickened section and then lock it on an edge of the racquet. Then the loose rivet sleeve is slid onto the unattached end of the string that protrudes outwards from the opposite side and then a thickened section is installed, ~or example, by clamping an appropriate element into position. This clamped-on element can then be grasped in the same way with a fork-like claw in order to apply the tensile force.
An apparatus for carrying out the procedure is distingui hed by the features that are set out in patent claim 4. In this connection, it is advantageous that the thickened section of the individual string to which the tensile force is to be applied, 2~273~
can be grasped by the claw of the tensioning device, and in that then the tensioning device can be installed on the frame of the racquet, when the stop will lie against the outer edge of the racquet. The tensioning device is then locked in position by means of the locking element, which can be configured in the form of a pin, for example. Since the claw and the locking element lie in each instance on opposite sides of the stop that is provide~ to lie against the outer edge, one can achieve a certain pretensioning of the string by grasping the thickened section of the individual string with the claw and by resting the stop against the outer edge of the racquet. The user can then pivot the tensioning device against the force of this previously achieved initial tension to the point that the receiving devices that are used to accommodate the locking element lie on the inner side of the racquet edge, so that then the locking element, for example the pin, can be inserted. This applies an additional pretensioning to the individual string. For practical use, this entails the important advantage for the user that the string that is to be tightened does not slip out of the racquet edge when the tensioning device is being installed.
In an advantageous configuration of the invention, provision is made such that the claw is arranged in a sleeve that is supported in the tensionin~ arm so as to be moveable against an initial tensioning force. This has the advantage that the claw can adapt to the angle of inclination that changes during the installation ;~0273~a of the tensioning device and the adjustment of the initial tensioning force. This initial tensioning force is most expediently generated by a pretensioning spring. The pretensioning force that is set up in each instance can be indicated by means of a force-indicating system.
In a further configuration of the present invention, provision is made such that the adjusting system incorporates a self-limiting spindle-pinion arrangement.
The present invention is described in greater detail below on the basis of the drawings appended hereto. These show the following:
i~ure 1: a plan view of a racquet with a number of individual strings already installed and the tensioning apparatus;
Figure 2: a partial cross section through the tensioning device, at greater scale;
Figure 3: a cross sectional drawing through the sleeve that is supported so as to be loosely pivota~le in the tensioning arm of the tensioning device.
The head of a racquet 1 is strung with individual strings, each of which crosses over the other; figure 1 shows only one such individual string 2. This individual string 2 is shown in a position in which it is to be secured to tha edge 3 of the racquet, which is the left hand side in figure 1. on the ~Z73~
opposite side the unattached end 5 extends through the edge 4 of the racquet. The end 5 incorporates a thickened section (not shown herPin) that can be formed, for example, as a ball, as a clamped-on rivet sleeve or the like, such that this thickened section can be grasped by a claw of a tightening device 6. This claw is numbered 7 in both ~igure 2 and fîgure 3.
The following steps of the process are taken before the individual string 2 reaches the position that is shown in figure 1.
At its end 5, the individual string 2 incorporates the thickened section discussed heretofore. Before the introduction of the individual string into the racquet, a rivet sleeve is slid onto the string 2 from the opposite side such that the rivet head of the rivet sleeve is proximate to the thickened sec-tion. Then, the end of the individual string 2 that is remote from the thickened section is passed through a drilled hole 9 in the edge 4 of the racquet from the. outside, threaded over or below the strings that run transversely to it, and then passed through the drilled hole 10 into the opposite edge 2 of the racquet. A rivet sleeve is then slid over the end that projects ~eyond the rac~uet edge 3 to the outside, as in figure 1, and this rivet sleeve is then clamped firmly onto the individual string 2 by means of a clamping apparatus. Then, the string 2 is pulled from the end 5 whereupon the rivet sleeve secured thereto is drawn into the 7~.
drilled hole lo. The sizes of the drilled holes in the racquet edge and the rivet sleeves are so matched that the rivet sleeve can fit into the hole, whereas the head of the rivet sleeve rests against the ed~e of the drilled hole so that it is stopped. Then the end of the individual string ~ that extends beyond the xivet head is cut off.
Figure 1 shows the situation in which the unattached end 5 of the individual string 2 has been grasped by the tensioning apparatus 6. The tensioning apparatus 6 rests on the edge 4 of the racquet. A tensioning lever 12 can be pivoted in the direction indicated by the arrow A by rotating the hand wheel 11. This means that an initial tensioning force is applied to the string 2. The magnitude of the initial tensioning force that is applied can be read off a scale 13. When the initial tensioning force that is applied reaches the desired magnitude, the rivet sleeve ~not shown in figure 1) which is located in the area b~tween the thickened section that is grasped by the claw and the outer edge 4 of the racquet, is clamped securely onto the string by means o~
a clamping apparatus that can be in the form of a crimping tool (not shown herein). Then the initial tensioning force is reduced by rotation of the hand wheel 11 and associated rotation of the tensioning lever 12 in the direction opposite that which is indicated by the arrow A, this being done until the remaining tensioning force draws the rivet sleeve that has just been clamped into position into the drilled hole 9 until the rivet . ~
head of this rivet sleeve rests against the edge of the drilled hole 9. All that is then required is to cut off the end 5 of the individual string 2 that extends beyond the rivet head and which incorporates the thickened section.
The magnitude of the tensile force that is exerted by the tensioning device 6 is so selected that in the finished state the tension on the spring corresponds to the desired degree of tightness of the strings.
on a body 14 the tensioning device 6 incorporates a stop 15 that is provided to rest against the outer edge o~ th~e racquet 1. In addition, the sides 16 and 17 are such that they latch over the edge 4 of the racquet. In the sides 16 and 17 there are r~cesses in the form of holes 18, 19 that are used to accommodate a locking element that is, for example, in the ~orm of a pin. By this means, the tensioning device can be installed very simply on the edge of the racquet from the outside such that the stop 15 lies against the outer edge and the locking element passes through the receptacles 18 and 19 and then the locking element lies against the inner edge.
The tensioning lever 12, discussed heretofore, is supported in the body 14 so as to pivot at point 20, so that it can be pivoted by the spindle 21, which can be rotated by turning the hand wheel 12, and a gear arrangement 22, about the pivot axis 20. The 2C)~)~f73~
tensioning lever 12 has, at its unattached end, a sleeve 23 that is loosely rotatable in the tensioning a~m 12 at point 24. The claw 7 is incorporated in the sleeve 23 and this serves to accommodate the thickened section of the individual string that is to be subjected to a tensile force, and can move against the pretensioning of a spring 24. A tension indicating device 25 is connected to the claw 7 and this device incorporates a simple measurement scale (not shown herein).
When the individual string 2 has reached the position that is shown in figure 1 (in which it has not been grasped by the tensioning device), the user ~irst takes the tensioning device that is not initially mounted on the racquet and picks up the thickened section at the unattached end 5 of th~ individual string by means of the claw 7. Then the user applies the tensioning device with the stop 15 against the outer edge of the racquet edge 4. If the thickened section is not protruding too far towards the outside a slight amount of initial tensioning force will be applied to the individual string, albeit a very slight one, that will however be sufficient to prevent the thickened section from slipping out of the claw 7. ~hen, the sides 16 and 17 are slid over the edge of the racquet and the locklng element is positioned in the locking element recesses 18 and 19. The tilting movement of the tensioning device about the contact of the stop 15 which is associated with this then applies a further pretensioning to the individual string 2. Thenl the 73~
tensile force that is desired for the particular string is set on the hand wheel 11. Most expediently the ~alue that can be read off the measurement scale 25 corresponds to the tensile force ultimately desired. After crimping the riveting sleeve that is loosely installed between the outer edge of the racquet and the thickened section on the unattached end 5, the tensile force is reduced until the rivet sleeve moves back into the drilled hole 9. The pro~ecting end 5 is then cut off and the tensioning device is removed from the racquet.
.
German utility patent G 86 24 960 describes an apparatus for stringing racquets with individual strings, this incorporating a section that can be applied to the edge of the racquet and a retaining section thak is applied to the inner edge o~ the racquet, and a tensioning device with a clamping system to hold the string. Furthermore, this incorporates a measuring system for indicating the degree o~ pretension that has been achieved, as well as an apparatus for crimping the rivet sle~ve onto the pretensioned strings.
A disadvantage here is that the individual string, which has been introduced from the opposite side o~ the racquet frame and threaded through strings that have been previously installed and then secured on the opposite edge side has to be threaded through the tension head of the tensioning device so as to have a tensile force applied to it by means of clamping jaws. This procedure, which can be re~erred to as a "thre~ding procedure" entails disadvantages in practice, because strin~ing a racquet with individual strings is intended to make it possible that the tennis player who has a string broken in his racquet can replace this broken string immediately and wherever the breakage occurs.
,, - . -: : . .
' ~C)OZ731.
It is the task of the present invention to propose a procedure for stringing a racquet for ball games, in particular tennis-type games, with individual strings, and, in addition, to describe an apparatus that can be operated very simply to achie~e this purpose.
In order to solve this task, the present inventi~n propo~es a procedure that entails the prccedural steps set out in the descriptive portion of patent claim 1. Because of the fa~t that the tensile force is in this instance applied to a thickened section of the individual string, there is no need for the tiresome threading of the string that was needed during the former procedure, since the tensile force can be applied by ~he action of a claw or the like and applied to the thickened portion of the string. The thickened portion of the string is thus not clamped, but is held loosely in the claw element. The individual string is not damaged by clamping elements when tensile force is applied to it and the individual strings can rotate prior to the application of any tensile force because of the initially loose positioning in the claw.
The thickened saction can be present from the very outset in an end area or in one end of the individual string. Then, prior to introducing the individual string into the racquet, it is necessary to first slip on a rivet sleeve such that the rivet 3~
head of the rivet sleeve is proximate to the thickened portion.
Then, a rivet ~leeve is clamped onto the "opposite" outer side o~
the racquet onto the individual string, whereupon tensile force is applied to the thickened section, the previously installed rivet sleeve is clamped tight, and then the tensile force is reduced so that the rivet sleeve, now secured in place, slips back into the drilled hole as a result of the remaining tension until such time as the rivet head lies against the edge of the hole, whereupon the string is under tension. All that is then required is to cut off that end of the individual string that incorporates the thickened section.
As an alternative, it is, of course, also possible to first introduce an individual string without a thickened section and then lock it on an edge of the racquet. Then the loose rivet sleeve is slid onto the unattached end of the string that protrudes outwards from the opposite side and then a thickened section is installed, ~or example, by clamping an appropriate element into position. This clamped-on element can then be grasped in the same way with a fork-like claw in order to apply the tensile force.
An apparatus for carrying out the procedure is distingui hed by the features that are set out in patent claim 4. In this connection, it is advantageous that the thickened section of the individual string to which the tensile force is to be applied, 2~273~
can be grasped by the claw of the tensioning device, and in that then the tensioning device can be installed on the frame of the racquet, when the stop will lie against the outer edge of the racquet. The tensioning device is then locked in position by means of the locking element, which can be configured in the form of a pin, for example. Since the claw and the locking element lie in each instance on opposite sides of the stop that is provide~ to lie against the outer edge, one can achieve a certain pretensioning of the string by grasping the thickened section of the individual string with the claw and by resting the stop against the outer edge of the racquet. The user can then pivot the tensioning device against the force of this previously achieved initial tension to the point that the receiving devices that are used to accommodate the locking element lie on the inner side of the racquet edge, so that then the locking element, for example the pin, can be inserted. This applies an additional pretensioning to the individual string. For practical use, this entails the important advantage for the user that the string that is to be tightened does not slip out of the racquet edge when the tensioning device is being installed.
In an advantageous configuration of the invention, provision is made such that the claw is arranged in a sleeve that is supported in the tensionin~ arm so as to be moveable against an initial tensioning force. This has the advantage that the claw can adapt to the angle of inclination that changes during the installation ;~0273~a of the tensioning device and the adjustment of the initial tensioning force. This initial tensioning force is most expediently generated by a pretensioning spring. The pretensioning force that is set up in each instance can be indicated by means of a force-indicating system.
In a further configuration of the present invention, provision is made such that the adjusting system incorporates a self-limiting spindle-pinion arrangement.
The present invention is described in greater detail below on the basis of the drawings appended hereto. These show the following:
i~ure 1: a plan view of a racquet with a number of individual strings already installed and the tensioning apparatus;
Figure 2: a partial cross section through the tensioning device, at greater scale;
Figure 3: a cross sectional drawing through the sleeve that is supported so as to be loosely pivota~le in the tensioning arm of the tensioning device.
The head of a racquet 1 is strung with individual strings, each of which crosses over the other; figure 1 shows only one such individual string 2. This individual string 2 is shown in a position in which it is to be secured to tha edge 3 of the racquet, which is the left hand side in figure 1. on the ~Z73~
opposite side the unattached end 5 extends through the edge 4 of the racquet. The end 5 incorporates a thickened section (not shown herPin) that can be formed, for example, as a ball, as a clamped-on rivet sleeve or the like, such that this thickened section can be grasped by a claw of a tightening device 6. This claw is numbered 7 in both ~igure 2 and fîgure 3.
The following steps of the process are taken before the individual string 2 reaches the position that is shown in figure 1.
At its end 5, the individual string 2 incorporates the thickened section discussed heretofore. Before the introduction of the individual string into the racquet, a rivet sleeve is slid onto the string 2 from the opposite side such that the rivet head of the rivet sleeve is proximate to the thickened sec-tion. Then, the end of the individual string 2 that is remote from the thickened section is passed through a drilled hole 9 in the edge 4 of the racquet from the. outside, threaded over or below the strings that run transversely to it, and then passed through the drilled hole 10 into the opposite edge 2 of the racquet. A rivet sleeve is then slid over the end that projects ~eyond the rac~uet edge 3 to the outside, as in figure 1, and this rivet sleeve is then clamped firmly onto the individual string 2 by means of a clamping apparatus. Then, the string 2 is pulled from the end 5 whereupon the rivet sleeve secured thereto is drawn into the 7~.
drilled hole lo. The sizes of the drilled holes in the racquet edge and the rivet sleeves are so matched that the rivet sleeve can fit into the hole, whereas the head of the rivet sleeve rests against the ed~e of the drilled hole so that it is stopped. Then the end of the individual string ~ that extends beyond the xivet head is cut off.
Figure 1 shows the situation in which the unattached end 5 of the individual string 2 has been grasped by the tensioning apparatus 6. The tensioning apparatus 6 rests on the edge 4 of the racquet. A tensioning lever 12 can be pivoted in the direction indicated by the arrow A by rotating the hand wheel 11. This means that an initial tensioning force is applied to the string 2. The magnitude of the initial tensioning force that is applied can be read off a scale 13. When the initial tensioning force that is applied reaches the desired magnitude, the rivet sleeve ~not shown in figure 1) which is located in the area b~tween the thickened section that is grasped by the claw and the outer edge 4 of the racquet, is clamped securely onto the string by means o~
a clamping apparatus that can be in the form of a crimping tool (not shown herein). Then the initial tensioning force is reduced by rotation of the hand wheel 11 and associated rotation of the tensioning lever 12 in the direction opposite that which is indicated by the arrow A, this being done until the remaining tensioning force draws the rivet sleeve that has just been clamped into position into the drilled hole 9 until the rivet . ~
head of this rivet sleeve rests against the edge of the drilled hole 9. All that is then required is to cut off the end 5 of the individual string 2 that extends beyond the rivet head and which incorporates the thickened section.
The magnitude of the tensile force that is exerted by the tensioning device 6 is so selected that in the finished state the tension on the spring corresponds to the desired degree of tightness of the strings.
on a body 14 the tensioning device 6 incorporates a stop 15 that is provided to rest against the outer edge o~ th~e racquet 1. In addition, the sides 16 and 17 are such that they latch over the edge 4 of the racquet. In the sides 16 and 17 there are r~cesses in the form of holes 18, 19 that are used to accommodate a locking element that is, for example, in the ~orm of a pin. By this means, the tensioning device can be installed very simply on the edge of the racquet from the outside such that the stop 15 lies against the outer edge and the locking element passes through the receptacles 18 and 19 and then the locking element lies against the inner edge.
The tensioning lever 12, discussed heretofore, is supported in the body 14 so as to pivot at point 20, so that it can be pivoted by the spindle 21, which can be rotated by turning the hand wheel 12, and a gear arrangement 22, about the pivot axis 20. The 2C)~)~f73~
tensioning lever 12 has, at its unattached end, a sleeve 23 that is loosely rotatable in the tensioning a~m 12 at point 24. The claw 7 is incorporated in the sleeve 23 and this serves to accommodate the thickened section of the individual string that is to be subjected to a tensile force, and can move against the pretensioning of a spring 24. A tension indicating device 25 is connected to the claw 7 and this device incorporates a simple measurement scale (not shown herein).
When the individual string 2 has reached the position that is shown in figure 1 (in which it has not been grasped by the tensioning device), the user ~irst takes the tensioning device that is not initially mounted on the racquet and picks up the thickened section at the unattached end 5 of th~ individual string by means of the claw 7. Then the user applies the tensioning device with the stop 15 against the outer edge of the racquet edge 4. If the thickened section is not protruding too far towards the outside a slight amount of initial tensioning force will be applied to the individual string, albeit a very slight one, that will however be sufficient to prevent the thickened section from slipping out of the claw 7. ~hen, the sides 16 and 17 are slid over the edge of the racquet and the locklng element is positioned in the locking element recesses 18 and 19. The tilting movement of the tensioning device about the contact of the stop 15 which is associated with this then applies a further pretensioning to the individual string 2. Thenl the 73~
tensile force that is desired for the particular string is set on the hand wheel 11. Most expediently the ~alue that can be read off the measurement scale 25 corresponds to the tensile force ultimately desired. After crimping the riveting sleeve that is loosely installed between the outer edge of the racquet and the thickened section on the unattached end 5, the tensile force is reduced until the rivet sleeve moves back into the drilled hole 9. The pro~ecting end 5 is then cut off and the tensioning device is removed from the racquet.
.
Claims (9)
1. A procedure for stringing racquets used for ball games, in particular tennis-type games, with individual strings, characterized in that a string is passed from the outside through a drilled hole in the edge of the racquet, and then passed over or above already inserted strings, as required, then from the inside edge of the racquet is passed through the opposite drilled hole; and in that then a rivet sleeve is slid onto the unattached end that is passed to the outside, from the outer side of the racquet, and this is then connected rigidly by means of a crimping procedure and then the end of the string that extends beyond the head of this rivet sleeve is cut off, whereupon the rivet sleeve is drawn into the drilled hole from the opposite outer side of the racquet so that the head of the rivet sleeve forms a stop for the end of this string; and in that then a tensile force that is applied towards the outside is applied to the area of the string that projects on the opposite side, the magnitude of which can optionally be indicated; and in that then by means of a crimping process and before the tensile force is applied a loose rivet sleeve that has been installed on the area of the string that projects beyond the outer edge is connected rigidly with the string prior to the application of the tensile force; and in that then the tensile force is reduced so that the above-referred to rivet sleeve is drawn into the drilling in the racquet by means of the residual tension: and wherein then the end of the string that projects beyond this rivet head is cut off.
2. A process as defined in claim 1, characterized in that the tensile force is applied to a thickened section on the area of the string that extends outwards.
3. A procedure as defined in claim 2, characterized in that an individual string that incorporates a thickened section at one end is introduced into the racquet, the rivet sleeve being slid onto this so that the rivet head is proximate to the thickened section, prior to installation.
4. A procedure as defined in claim 2, characterized in that during the introduction of the individual string this initially has no thickened section; and in that after locking on the opposite side of the racquet the loose rivet sleeve is slid onto the unattached free end that still projects to the outside;and in that then a thickened section is installed on the unattached end, for example, by crimping on an appropriate element.
5. An apparatus for carrying out the procedure as defined in one of the claims 1 to 4, wherein a tensioning apparatus (6) is used to apply the tensile force to the thickened section of the individual string (2) and the tensioning device incorporates a body (14) with sides (16, 17) that project beyond a stop (15) that is provided to lie against the outer edge (4) of the racquet, that overlap the racquet edge on both sides to a point inside the inner area of the racquet, these sides (16, 17) incorporating recesses (18, 19) that are at a distance from the stop and serving to accommodate a locking element that forms connection to the inside area of the racquet; and in that the tensioning device (6) incorporates a tensioning lever (12) that can be pivoted in the plane of the racquet and adjusted by means of an adjusting system and is arranged so as to be remote from the recesses for the locking element, on which is arranged a claw (7) to accommodate the thickened section of the individual string (2) that is to be put under tension.
6. An apparatus as defined in claim 5, characterized in that the claw (7) is arranged in a sleeve (23) that is supported so as to be loosely rotatable in the tensioning lever (12), such that it can move against an initial tensioning force.
7. An apparatus as defined in claim 6, characterized in that a pre-tensioning spring (24) is incorporated in order to generate a pretensioning force
8. An apparatus as defined in claim 6 or claim 7, characterized in that it incorporates a force-indicating system (21) to indicate the initial tensioning force that has been set.
9. An apparatus as defined in one of the claims 5 to 8, characterized in that the adjusting system incorporates a self-limiting spindle-pinion arrangement (21, 22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2002731 CA2002731A1 (en) | 1989-11-10 | 1989-11-10 | A procedure for stringing racquets used for ball games and an apparatus for carrying out this procedure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2002731 CA2002731A1 (en) | 1989-11-10 | 1989-11-10 | A procedure for stringing racquets used for ball games and an apparatus for carrying out this procedure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2002731A1 true CA2002731A1 (en) | 1991-05-10 |
Family
ID=4143534
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2002731 Abandoned CA2002731A1 (en) | 1989-11-10 | 1989-11-10 | A procedure for stringing racquets used for ball games and an apparatus for carrying out this procedure |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2002731A1 (en) |
-
1989
- 1989-11-10 CA CA 2002731 patent/CA2002731A1/en not_active Abandoned
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