US3635080A - Racket-stringing machine with automatic locking - Google Patents

Racket-stringing machine with automatic locking Download PDF

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Publication number
US3635080A
US3635080A US733601A US3635080DA US3635080A US 3635080 A US3635080 A US 3635080A US 733601 A US733601 A US 733601A US 3635080D A US3635080D A US 3635080DA US 3635080 A US3635080 A US 3635080A
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Prior art keywords
clamp
racket
turntable
plane
string
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Expired - Lifetime
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US733601A
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English (en)
Inventor
Harvey R Krueger
Dean R Armentrout
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COURT AND SLOPE Inc
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COURT AND SLOPE Inc
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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 string is pulled by a hydraulic cylinder to accurate tension determined by the hydraulic pressure for which there is an adjustable relief valve and gauge.
  • the piston of the cylinder operates a pull bar along which the pulling clamp may be shifted laterally so as to pull in the most advantageous direction.
  • the cylinder is slightly shiftable.
  • the return stroke of the pull bar is limited before the piston seats. Reaction to the retracting pressure releases a spring-set brake to make the yoke free to turn; and reaction to the pulling pressure reinforces the braking force of the spring.
  • a holding clamp can be manually shifted to an advantageous position within the frame when fully released, and the manual closing stroke on its operating lever first raises it to string height, then completes the clamp closing operation and locks the clamp to the turntable, so that it swings with the racket between successive pulls.
  • the parts are so positioned and dimensioned that a racket frame may be strung in both directions without releasing it from the swingable yoke.
  • the combination of a laterally shiftable pull clamp and automatic locking of the turn yoke to which the racket is clamped permits pulling the string at the most advantageous angle so that friction will have minimum effect in disturbing the equality of successive pulls.
  • the pulling is performed by hydraulic power by pressure accurately adjusted and readable on a gauge.
  • the pull cylinder also controls a locking brake so that the turntable is locked as the pull begins.
  • the braking or locking force is automatically increased by the reaction to the pull.
  • Springs also contribute to the braking or locking force, the pressure applied by these springs being overcome by the return stroke of the cylinder and piston combination which performs the pull.
  • the holding clamp automatically drops.
  • FIG. 1 is a perspective view of the machine chosen for illustration of this invention with a cover removed, and shown in the course of stringing a racket;
  • FIG. 2 is a view looking down on the machine of FIG. I with the cover and racket clamping jaws removed;
  • FIG. 2A is a similar view on a larger scale, with some parts removed or in section, cylinder 18 being retracted;
  • FIG. 3 is a fragmentary sectional view taken mainly along the line 3-3 ofFIG. 2A;
  • FIGS. 4 and 5 are respectively side and top views of the racket holder and the lockable mounting for the holding clamp, with some parts broken away to a sectional view;
  • FIGS. 6, 7 and 8 are views from two sides and the top of the holding clamp, with supporting parts shown in FIG. 6;
  • FIG. 9 is a diagram, mainly hydraulic but with some electric control. 0
  • the machine chosen for illustration includes a base 11, a turntable 12 rotatably carried by the base 11 and formed mainly of a yoke 13 at the top of which the racket 14 to be strung is clamped.
  • the string to be pulled for tensioning is placed in clamp 16, which is closed by manual operation of its handle 82.
  • a button 17 is then pressed, whereupon fluid is supplied to hydraulic cylinder 18 to the rear of the piston therein pushing pull bar 19 outwardly toward the operator. Since clamp 16 is carried by this pull bar, this pulls the string, applying an exact tensioning to it which may be read on gauge 21, on front panel 20, having been set by relief valve control knob 22. While this tension is held on the string, holding clamp 23, having been released from its previous holding task, is moved to a position under the freshly pulled string, just inside of the frame near the pull clamp 16.
  • Closing the handle of clamp 23 first raises it to a position to seize the string, then closes upon the string and simultaneously locks the clamp base 68 to the turntable I2.
  • Clamp 16 is now manually opened, and by button 17 the pressure fluid is supplied to the other end of cylinder 18, thereby returning pull rod 19 and releasing the brake previously holding turntable 12.
  • the turntable 12 is now swung approximately by hand, clamp 23 moving with it so as to hold the tension of the string.
  • the free end of the string is now threaded through the next aperture and slipped between the jaws of clamp 16 whereupon the operating cycle previously described is begun again.
  • a spool 26 is rotatably mounted around the upper stub end of a fixed shaft 27.
  • a horizontal channel bar 28 is secured to the spool 26, and carries the yokes 13, the upper ends 29 of which form the fixed jaws for supporting and clamping the racket being strung.
  • a threaded stud 31 extends upwardly from each jaw -29, and a movable jaw 32, moved by a nut 33 which may be a wingnut completes the clamp in each instance.
  • the yokes 13 are adjustable along channel bar 28 to fit different rackets, being secured in any adjusted positions by screws 34.
  • Channel bar 28 has extending through it and welded to it a threaded stud 36, the head 37 of which pilots into spool 26 thereby centering the stud 36 and the channel bar 28, and perhaps positioning threaded stud 36 more rigidly. Screws secure channel bar 28 to spool 26.
  • a deeply slotted spool 38 is threaded on stud 36 and locked in place with a locknut 39. By loosening the locknut, spool 38 may be adjusted in height to adjust the height of the holding clamp 23 carried by it.
  • Rear head 44 When pressure fluid is supplied to rear head 44, it tends to press piston 48 and piston rod 49 outwardly. The hydraulic pressure likewise bears on rear head 44 tending to press it and cylinder 18 rearwardly.
  • Rear head 44 is formed with a stud 51 which is secured firmly to brake bar 41 as by being threaded into it.
  • Brake bar 41 is also pressed rearwardly by sliding actuator rods 52, which fit it loosely and are biased by springs 53.
  • springs 53 press the sliding actuator rods 52, which in turn press brake bar 41 into engagement with spool 26.
  • the brake bar has beveled faces 56, and as seen in FIG. 3, spool 26 has correspondingly beveled faces 57 forming the sides of a peripheral groove in it.
  • brake bar 41 engages the spool with a wedging action which firmly locks it.
  • a 3 bevel is suitable.
  • the pull clamp Before clamping the string in the pull clamp 16, the pull clamp may be slid along bar 19 to a desired location and the turntable manually turned at the same time to provide pulling at the most desirable angle with respect to the frame of the racket, thus minimizing variations in tensioning of the strings due to varied frictional conditions.
  • Pull guide bars 61 are firmly secured (as by threads) to cross head 62 on which the pull bar 19 is mounted. Each of the pull guide bars 61 slides smoothly in a bearing cylinder 63 extending through flanges 46 and secured therein by snaprings 64. Bearing cylinder 63 is fitted at each end with bearing sleeves 66 with which the guide rod 61 is smoothly guided. Friction must be very nearly uniform with all positions of pull clamp 16. This is difficult to achieve but is achieved using a Thompson linear ball bushing for each of the bearing sleeves 66.
  • the holding clamp 23 is a self-locking toggle-type clamp, carried by a shiftable but lockable base 68.
  • This base 68 is provided with an upstanding socket 69.
  • a clamp body 71 is provided with a shank sleeve 72 snugly fitting the socket 69 to be turnable and vertically shiftable therein. The upward shifting movement is limited by a snapring 73, fitting in a groove in shank 72.
  • the upper end of the clamp body 71 is supplied with a fixed jaw 74.
  • a movable jaw 76 cooperating with jaw 74 is pivoted to the body 71 by a pin 77, held in place by snap ring 78.
  • a compression spring 79 positioned in a suitable socket, may be provided for urging the jaws to the opened position.
  • the jaws are preferably provided with friction face plates 81.
  • a clamp handle 82 is floatingly associated with body 71 by means of an actuator pin 83 and a toggle link 84.
  • the actuator pin 83 presses movable jaw 76 upwardly when handle 82 is actuated toward body 71, or inwardly. If for convenience pin 83 projects beyond the fin 86 by which it is carried, it may move idly in a recess provided for it in body 71.
  • Toggle link 84 is pivoted to the lower portion of fin 86 on handle 82 and to the upper end of thrust rod 87.
  • Thrust rod 87 bears on adjustment screw 88 by which it has adjustable coaction with locking lever 89.
  • toggle link 84 As handle 82 is swung downwardly, it combines with toggle link 84 to form a double toggle linkage which, as it begins to straighten out, raises clamp body 71, thereby raising the jaws 74 and 76 to lie on opposite sides of the string about to be clamped. Inasmuch as the clamp body 71 and handle 82 will be jointly grasped in one hand, this quickly becomes an automatic positioning action.
  • the toggle linkage exerts upward pressure on movable jaw 76 and downward pressure on locking lever 89.
  • the upward pressure firmly clamps the string which is under tension due to the pull thereon by pulling clamp 16.
  • the locking lever 89 firmly locks the holding clamp 23 against any relative movement between it and the turntable.
  • the turntable is free to turn, it, the clamped racket, and clamp 23 holding the tensioned string will all move as a unit.
  • the clamping lever 89 is pivoted by a pin 91 to shiftable clamp base 68, both being bifurcated to lie within the deep groove of spool 38, but to be shiftable a substantial distance therein. This distance is limited by the depth of the slot 92 in one direction and by pin 91 in the opposite direction to the extent of movement at which locking will take place.
  • locking lever 89 is pressed downwardly by thrust pin 87, locking lugs 93 are pressed onto the lower flange of spool 38, while a substantially equal pressure is exerted against the upper flange by shiftable base 68.
  • Adjustment screw 88 simultaneously adjusts the pressure of jaws 74, 76 on the string and the locking pressure at lugs 93.
  • the pull clamp 16 may be essentially like the holding clamp 23. However, the adjustment screw 88A will be threaded into the bottom of shank sleeve 72A of body 71A, which is free to turn in socket 69A, but not to move up and down. Socket 69A is part of slide bracket 94, slidable on pull bar 19. As seen in FIG. 3, slide bracket 94 is normally in the vertical position, resting on crosshead 62. It can swing downwardly to the dotted line position to let the racket handle swing past clamp 16.
  • the hydraulic and electrical circuits are sufficiently indicated in FIG. 9.
  • the parts not already described include a pump and reservoir so designated in the drawing and a relief valve 96 which determines the maximum pressure to be delivered by the pump.
  • the pump is preferably a positive displacement pump. It is driven by an electric motor, not shown, controlled by a main switch.
  • a needle valve 97 controls the speed of hydraulic flow and hence the speed of operation of the parts.
  • a two-position, four-port hydraulic valve 98 is controlled by a solenoid 99 which in turn is controlled by button 17.
  • the valve 98 is biased, as by a spring, to the position connecting the source of hydraulic fluid to head 43 and connecting head 44 directly to the reservoir.
  • a machine for stringing rackets including a base, a turntable rotatably mounted on the base, means for clamping a racket frame to the turntable, a string-holding clamp carried by the turntable and movable into the plane of the strings for holding a tensioned run of string and movable with respect to the turntable at will, a pull clamp having jaws substantially in the plane of the racket and mounted on a movable unit for movement in one direction for pull of a string, a cylinder and piston combination for moving said pull clamp and said unit in the pull direction the pull clamp being mounted for ready and frequent preliminary shifting laterally with respect to the direction of movement of said unit.
  • a machine for stringing rackets including means for locking the turntable against rotation, means for guiding the movement of the pull clamp while maintaining its movement substantially free from frictional variations resulting from laterally differing positions of the clamp, hydraulic means for actuating the cylinder-piston combinations, and an operator-adjustable relief valve for determining the pulling tension by limiting the pressure delivered to the cylinder during pulling.
  • a machine for stringing rackets according to claim I including means for locking the turntable against rotation.
  • a machine for stringing rackets including means for guiding the movement of the pull clamp while maintaining its movement substantially free from frictional variations resulting from laterally differing positions of the clamp.
  • a machine for stringing rackets according to claim 1 including automatic means for locking the turntable during the pulling operation.
  • a machine for stringing rackets including a base, a turntable rotatably mounted on the base, means for clamping a racket frame to the turntable, a string-holding clamp carried by the turntable and movable into the plane of the strings for holding a tensioned run of string and movable with respect to the turntable at will, a pull clamp having jaws substantially in the plane of the racket and mounted on a movable unit in one direction for pull of a string, a cylinder and piston combination for moving said pull clamp and said unit in the pull and return directions, and power driven means for supplying fluid to the cylinder, and
  • a machine for stringing rackets according to claim 6; said means for locking including a brake normally biased to lock the turntable and released by the cylinder and piston combination at the end of the return stroke thereof.
  • said means for locking including a brake normally biased to lock the turntable, and coupled to the reactive portion of the cylinder and piston combination to be urged thereby in the locking direction in reaction to the pulling force, and in the release direction in reaction to a limitation of the return stroke.
  • a tension-holding assembly including a clamp support movable with respect to the racket holder in directions parallel to said plane, a clamp reciprocable on the support perpendicularly to said plane and including jaws movable into said plane to grip a strung string and means directly associated with the clamp, and operable by continuing and unitary movement of the same hand which moved the jaws into said plane, for closing the jaws to grip a string, and for locking the support to hold the clamp and its gripped string.
  • a tension-holding assembly according to claim 9; said string-holding clamp being movable to all string-holding positions within the frame and said clamp being pivotable with respect to its support generally about an axis perpendicular to said plane for clamping alignment with strings strung in either direction.
  • a tension-holding assembly in which the means for closing the jaws includes a handle which also operates the means for locking the support.
  • a tension-holding assembly in which the means for closing the jaws includes a handle which in addition produces a reciprocation movement to move the jaws into said plane before the closing movement of the jaws.
  • a tension-holding assembly in which said means for closing causes a reciprocation movement by reaction to its jaw closing effort and said jaws being biased to the open position with sufficient strength to resist closing until the reciprocation movement reaches its limit.
  • a tension-holding assembly in which the racket holder is on a turntable and the means for locking the support locks it to the turntable.
  • a tension-holding assembly including a clamp support movable with respect to the racket holder in directions parallel to said plane, a clamp carried by the support and movable perpendicularly to said plane and including jaws thereby jointly movable generally into said plane and closable to grip a strung string, means for closing the jaws to grip a string, characterized by:
  • said turntable including a spool having its axis near the center of the racket, fixed to the turntable and having a deep annular groove therein; and said clamp support and means for locking both being bifurcated and straddling the axis and being jointly effective to lock the clamp support means by force-spreading against the walls forming the groove.
  • a tension-holding assembly including a clamp support movable with respect to the racket holder in directions parallel to said plane, a clamp carried by the support and movable perpendicularly to said plane and including jaws thereby jointly movable generally into said plane and closable to grip a strung string, means for closing the jaws to grip a string, characterized by:
  • said turntable including a spool having its axis near the center of the racket, fixed to the turntable and having a deep annular groove therein; and said clamp support and means for locking both being bifurcated and straddling the axis and being jointly effective to lock the clamp support means by force-spreading against the walls forming the groove;
  • the means for closing the jaw being arranged to perform the force-spreading by reaction to the closing effort.
  • a tension-holding assembly including a clamp support movable with respect to the racket holder in directions parallel to said plane, a clamp carried by the support and movable perpendicularly to said plane and including jaws thereby jointly movable generally into said plane and closable to grip a string, characterized by:
  • string-tensioning means including a pull clamp, means for moving the pull clamp along a line selected at will from a variety of parallel lines displaced laterally with respect to the general direction of pull, and with selected force, and means for locking the turntable during the pull.
  • a tension-holding assembly including a clamp support movable with respect to the racket holder in directions parallel to said plane, a clamp carried by the support and movable perpendicularly to said plane and including jaws thereby jointly movable generally into said plane and closable to grip a strung string, means for closing the jaws to gri a string, characterized by: means or locking the support to the turntable; said turntable including a spool having its axis near the center of the racket, fixed to the turntable and having a deep annular groove therein; and said clamp support and means for locking both being bifurcated and straddling the axis and pivotally associated to each other to lock the clamp support by pivotal action causing locking engagement within the groove;
  • said clamp having a toggle linkage which upon being straightened thrusts in one direction to cause pivoting of the levers and in the opposite direction for closing the clamp.
  • a tension-holding assembly including clamp support means movable with respect to the racket holder in crossing directions parallel to said plane, a clamp movable with the support means and includingjaws further movable to grip a strung string, means for closing the jaws to grip a string, and means for locking the support means against all movement along said plane to hold the gripped string, said clamp being pivotal as to its support means about an axis generally perpendicular to said plane for alignment of its jaws with a string strung in either of the crossing directions for gripping said string;
  • said clamp being a toggle clamp in which the jaw closing toggle exerts a thrust perpendicular to the plane to thrust the jaws into adjacency to the strings before gripping the strings and to actuate the means for locking the support,

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Gripping Jigs, Holding Jigs, And Positioning Jigs (AREA)
  • Jigs For Machine Tools (AREA)
  • Clamps And Clips (AREA)
US733601A 1968-05-31 1968-05-31 Racket-stringing machine with automatic locking Expired - Lifetime US3635080A (en)

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Application Number Priority Date Filing Date Title
US73360168A 1968-05-31 1968-05-31

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US (1) US3635080A (xx)
BE (1) BE733867A (xx)
DE (1) DE1926389A1 (xx)
FR (1) FR2009784A1 (xx)
GB (1) GB1265748A (xx)
NL (1) NL6908165A (xx)
SE (1) SE357306B (xx)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US3964291A (en) * 1975-10-02 1976-06-22 Ogden John M Tennis racquet stringing calibrator
US3988022A (en) * 1975-06-04 1976-10-26 Tennis Machines, Inc. Racket stringing machine
US4049268A (en) * 1976-12-20 1977-09-20 Ray Lynn L Racket string clamp
US4156525A (en) * 1977-10-03 1979-05-29 Parnell Paul E Racket stringing apparatus
EP0004769A2 (en) * 1978-04-03 1979-10-17 U-Rect-It Pty. Limited. A games racquet stringing apparatus
WO1980001649A1 (en) * 1979-02-12 1980-08-21 J Balaban String pre-stretching apparatus and method for racket-stringing machine
US4376535A (en) * 1980-02-18 1983-03-15 Snauwaert & Depla Machine for stringing rackets
US4417729A (en) * 1982-02-26 1983-11-29 Prince Manufacturing, Inc. Racket stringing apparatus
US4620705A (en) * 1984-03-26 1986-11-04 Asics Corporation Racket stringing device
US5733212A (en) * 1996-10-08 1998-03-31 Wise U. S. A., Inc. Electronic racket stringing machine
US6093121A (en) * 1998-10-27 2000-07-25 Bishop; Jonah C. Swivel clamp for racket stringing
US6162139A (en) * 1999-04-26 2000-12-19 Deuce Industries Ltd. String tensioning device
US6398674B2 (en) * 2000-05-02 2002-06-04 Akira Tsuchida Gut-clamping mechanism in gut-stretching equipment for tennis rackets
US20030027670A1 (en) * 2001-08-03 2003-02-06 Van Der Pols Erik B. String tensioning force controlling apparatus for a racket stringer
US6583590B1 (en) * 2001-08-10 2003-06-24 David Chu String drawing device for a racquet
US10456633B1 (en) 2018-06-28 2019-10-29 Matthew James Polson Systems and methods for stringing a racket
CN112697335A (zh) * 2020-12-09 2021-04-23 芜湖玉泰汽车制动有限公司 一种便于检测刹车泵压力的检测装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2460688A1 (fr) * 1979-07-10 1981-01-30 Montana Sport Machine a corder les raquettes

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1863059A (en) * 1929-04-30 1932-06-14 Jaffe William Edward Berthold Stringing of lawn tennis and like rackets
US1969826A (en) * 1929-03-19 1934-08-14 Dunlop Rubber Company Limited - means for stringing tennis rackets with strings
US1989002A (en) * 1933-04-21 1935-01-22 Laurance C Doll Apparatus for stringing tennis rackets
GB429526A (en) * 1934-02-12 1935-05-31 Solomon Hirsh Sieff Improvements in apparatus for mechanically tensioning the strings of racquets
US2100948A (en) * 1936-11-25 1937-11-30 Doll Air Stringer Of America I Apparatus for stringing rackets
US2114216A (en) * 1937-05-18 1938-04-12 Doll Air Stringer Of America I Racket stringing apparatus
US2154870A (en) * 1936-06-10 1939-04-18 Edmundo H Serrano Apparatus for stringing tennis rackets
US2188250A (en) * 1938-10-14 1940-01-23 Edmundo H Serrano Racket stringing apparatus
US2262110A (en) * 1940-06-14 1941-11-11 Mineck Paul Racket stringing device
US2309849A (en) * 1940-07-29 1943-02-02 Rudolph A Kausal Racket stringing device
US3441275A (en) * 1967-03-03 1969-04-29 Franklin W Held Racket stringer
US3511502A (en) * 1967-02-22 1970-05-12 Spenle Et Pizzera Machines for the stringing of tennis rackets

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1969826A (en) * 1929-03-19 1934-08-14 Dunlop Rubber Company Limited - means for stringing tennis rackets with strings
US1863059A (en) * 1929-04-30 1932-06-14 Jaffe William Edward Berthold Stringing of lawn tennis and like rackets
US1989002A (en) * 1933-04-21 1935-01-22 Laurance C Doll Apparatus for stringing tennis rackets
GB429526A (en) * 1934-02-12 1935-05-31 Solomon Hirsh Sieff Improvements in apparatus for mechanically tensioning the strings of racquets
US2154870A (en) * 1936-06-10 1939-04-18 Edmundo H Serrano Apparatus for stringing tennis rackets
US2100948A (en) * 1936-11-25 1937-11-30 Doll Air Stringer Of America I Apparatus for stringing rackets
US2114216A (en) * 1937-05-18 1938-04-12 Doll Air Stringer Of America I Racket stringing apparatus
US2188250A (en) * 1938-10-14 1940-01-23 Edmundo H Serrano Racket stringing apparatus
US2262110A (en) * 1940-06-14 1941-11-11 Mineck Paul Racket stringing device
US2309849A (en) * 1940-07-29 1943-02-02 Rudolph A Kausal Racket stringing device
US3511502A (en) * 1967-02-22 1970-05-12 Spenle Et Pizzera Machines for the stringing of tennis rackets
US3441275A (en) * 1967-03-03 1969-04-29 Franklin W Held Racket stringer

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US3964291A (en) * 1975-10-02 1976-06-22 Ogden John M Tennis racquet stringing calibrator
US4049268A (en) * 1976-12-20 1977-09-20 Ray Lynn L Racket string clamp
US4156525A (en) * 1977-10-03 1979-05-29 Parnell Paul E Racket stringing apparatus
EP0004769A2 (en) * 1978-04-03 1979-10-17 U-Rect-It Pty. Limited. A games racquet stringing apparatus
EP0004769A3 (en) * 1978-04-03 1979-10-31 U-Rect-It Pty. Limited. A games racquet stringing apparatus
WO1980001649A1 (en) * 1979-02-12 1980-08-21 J Balaban String pre-stretching apparatus and method for racket-stringing machine
US4249732A (en) * 1979-02-12 1981-02-10 Balaban J A String pre-stretching apparatus and method for racket stringing machine
US4376535A (en) * 1980-02-18 1983-03-15 Snauwaert & Depla Machine for stringing rackets
US4417729A (en) * 1982-02-26 1983-11-29 Prince Manufacturing, Inc. Racket stringing apparatus
US4620705A (en) * 1984-03-26 1986-11-04 Asics Corporation Racket stringing device
US5733212A (en) * 1996-10-08 1998-03-31 Wise U. S. A., Inc. Electronic racket stringing machine
US6227990B1 (en) * 1996-10-08 2001-05-08 Wise U.S.A., Inc. Electronic racket stringing machine
US6093121A (en) * 1998-10-27 2000-07-25 Bishop; Jonah C. Swivel clamp for racket stringing
US6162139A (en) * 1999-04-26 2000-12-19 Deuce Industries Ltd. String tensioning device
US6398674B2 (en) * 2000-05-02 2002-06-04 Akira Tsuchida Gut-clamping mechanism in gut-stretching equipment for tennis rackets
US20030027670A1 (en) * 2001-08-03 2003-02-06 Van Der Pols Erik B. String tensioning force controlling apparatus for a racket stringer
US7192370B2 (en) * 2001-08-03 2007-03-20 Van Der Pols Erik B String tensioning force controlling apparatus for a racket stringer
US6583590B1 (en) * 2001-08-10 2003-06-24 David Chu String drawing device for a racquet
US10456633B1 (en) 2018-06-28 2019-10-29 Matthew James Polson Systems and methods for stringing a racket
CN112697335A (zh) * 2020-12-09 2021-04-23 芜湖玉泰汽车制动有限公司 一种便于检测刹车泵压力的检测装置

Also Published As

Publication number Publication date
BE733867A (xx) 1969-11-03
GB1265748A (xx) 1972-03-08
SE357306B (xx) 1973-06-25
NL6908165A (xx) 1969-12-02
FR2009784A1 (xx) 1970-02-06
DE1926389A1 (de) 1969-12-04

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