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WO1994028368A1 - Systeme de suspension de fleche mecanique-magnetique sans interference - Google Patents

Systeme de suspension de fleche mecanique-magnetique sans interference Download PDF

Info

Publication number
WO1994028368A1
WO1994028368A1 PCT/IT1994/000038 IT9400038W WO9428368A1 WO 1994028368 A1 WO1994028368 A1 WO 1994028368A1 IT 9400038 W IT9400038 W IT 9400038W WO 9428368 A1 WO9428368 A1 WO 9428368A1
Authority
WO
WIPO (PCT)
Prior art keywords
arrow
magnetic
clicker
rest
mechanical
Prior art date
Application number
PCT/IT1994/000038
Other languages
English (en)
Inventor
Maurizio Maurizi
Original Assignee
Maurizio Maurizi
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Maurizio Maurizi filed Critical Maurizio Maurizi
Priority to EP94914550A priority Critical patent/EP0701681A1/fr
Publication of WO1994028368A1 publication Critical patent/WO1994028368A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41B—WEAPONS FOR PROJECTING MISSILES WITHOUT USE OF EXPLOSIVE OR COMBUSTIBLE PROPELLANT CHARGE; WEAPONS NOT OTHERWISE PROVIDED FOR
    • F41B5/00—Bows; Crossbows
    • F41B5/14—Details of bows; Accessories for arc shooting
    • F41B5/1403—Details of bows
    • F41B5/1434—Clickers or draw indicators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41B—WEAPONS FOR PROJECTING MISSILES WITHOUT USE OF EXPLOSIVE OR COMBUSTIBLE PROPELLANT CHARGE; WEAPONS NOT OTHERWISE PROVIDED FOR
    • F41B5/00—Bows; Crossbows
    • F41B5/14—Details of bows; Accessories for arc shooting
    • F41B5/1403—Details of bows
    • F41B5/1438—Buttons

Definitions

  • the object of the present invention is a new arrow support system for archery.
  • the purpose of the invention is to eliminate every element that could cause interference between the bow and the arrow during crossing of the latter after the bow string release.
  • the planned system is usable on bows with a clicker.
  • the inspiring principle of this invention is to eliminate the mechanical flipper rest for the arrow and replace it with a magnetic suspension device.
  • a rigid arrow lying on the bow action plane geometrically set in line with the mark, encounters points of interference with the rest when its axis lies on the plane of symmetry for the bow (geometric centre).
  • the collision points are due to the lower feather of the arrow fletching during its passage on the rest.
  • the new suspension system will not change the trajectory of the arrow, since the bearing is obtained by magnetic forces whose field ends immediately after the departure of the arrow. In fact there is no influence on initial arrow flight even in the case of a centre-shot set on a geometrical centre. Since the arrow shafts, in paramagnetic or diamagnetic material (aluminium X7, XX75 alloy, carbon fibre, metal-nonmetal composite A.C.E., A.C.C., and so forth), are assembled with ferromagnetic point inserts, the forces produced by a permanent magnet could only hold up the arrow if its force lines have the chance to create a circuit through the high magnetic permeability of the point insert material. This also occurs if there is the thickness of a diamagnetic wall of the shaft across the magnetic flow.
  • paramagnetic or diamagnetic material aluminium X7, XX75 alloy, carbon fibre, metal-nonmetal composite A.C.E., A.C.C.,
  • the system Since the magnetic bearing operates only near the maximum elongation status, that is when the magnetic force lines can cross the ferromagnetic point insert, the system is designed to transfer to another element the task of supporting, sliding and guiding the arrow during the development of all the phases executed before the "anchorage" position of the archer (aim position at own maximum stretching elongation).
  • the basic criterium of the system is, therefore, to separate the arrow bearing requirements: initially, during the development of the alignment and traction phases carried out in the archer's movements, the arrow bearing is obtained by a mechanical supporting guide, and finally, when the aim position is achieved, the bearing requirement is assigned to a magnetic field of forces.
  • the components of the system could be manufactured in different shapes and/or arranged in different places.
  • Drawings on sheet no. 1/7 illustrate the system designed in such a way as not to alter the handle riser configuration so that the traditional clicker and flipper rest can easily be replaced by the components of the system.
  • Drawings on sheet no. 2/7 illustrate the system applied to a bow planned with an unbroken frame window. This choice, in which the magnet could be laid along the symmetrical axis of the bow appears an appropriate solution when a string releaser is in use. In fact, with this unhooking device, there are no arrow shaft vibrations so that it will be possible to have a coincidence between the centre shot and the geometrical centre.
  • Handle risers designed with the unbroken frame window and equipped with a mag-rest in the middle for lifting the arrow vertically and with a horizontal layout for the clicker could be the best solution for compound bows.
  • the first idea was to install the magnet in the pressure button hole and to shape the clicker tip as a hook without changing its original position.
  • the need to eliminate every interference between the clicker in the resting position and the flying arrow feather set led us to design a special hole in the wall of the riser window in which the tip could hide (Fig. 6 on sheet no. 3/7) .
  • Clicker point suspension adjustment allowed us to obtain the exact level of its hooking end and, therefore, the exact arrow height for guiding its point insert between the magnet pole shoes.
  • the magnet pole shoes were shaped in such a way as to be inscribed inside an elliptical cone surface with the greatest axis set parallel to the arrow axis.
  • Magnetic flow was perpendicular to arrow axis.
  • the angular obstruction of the magnet pole shoes was restricted to 60°.
  • the tips of the pole shoes were shaped in such a way as to assure a stable arrow shaft setting.
  • Retractable bearing clicker and rigid magnetic rest testing results revealed the excellent operating mode of the two system components oy observing the initial flight of the arrows.
  • the arrow impact zone was, however, reiterated on the left side of the target centre. This phenomenon supplied confirmation on the expected systematic error due to uncompensated arrow flexibility caused by the stiffness of the mag-rest arrangement.
  • Another critical element of the first experimental model was the lack of a supporting force due to the magnetic field which sometimes did not allow arrow support especially during nock movements caused by unstable anchorage as a result of muscle stress.
  • the arrow shaft can be supported because its sliding position is found between the pushing horizontal hook of the bearing clicker and the pole, shoes of the mag-rest. Since the hooking tip of the clicker can hide behind the obstruction of the mag-rest, it was found unnecessary to tool the hand-riser window to build it retractable.
  • arrows with ferromagnetic point inserts embedded in the shafts (aluminium X7 alloy, carbon fibre, A.C.E.) and arrows with specially designed ferromagnetic point inserts to allow the best contact with the magnetic pole shoes were used.
  • Condition “A” is when the arrow is supported by the clicker; condition “B” is when the arrow is supported only by magnetic forces between mag-rest and ferromagnetic point after the clicker release.
  • Rear view "A" of Fig. 2 illustrates the form of the clicker when it is in use as a mechanical bearing.
  • Rear view "B" of Fig. 3 illustrates the clicker in its non-working position and the contour of the shock absorbing rare earths mag-rest.
  • Drawings on sheet no.2/7 demonstrate a vertical magnetic bearing system applied to an all round frame window compound bow. In this case, the clicker pushes the arrow up against the pole shoes of the magnet.
  • Drawings on sheet no. 3/7 illustrate the lateral and frontal views of a retractable bearing clicker (Fig. 6) and those of a horizontal pushing bearing clicker (Fig. 7).
  • the cylindrical tablet core has a polydirectio ⁇ nal magnetization on its surfaces so that it has to be housed to face one of these towards the arrow.
  • Aluminium case for housing the rare earths magnetic core.
  • the tip of the shell is moulded to guide a sliding arrow.
  • the semi-cylindrical cavity drilled at the forward end of the shell is sized according to the external diameter of the arrow. Iron rear stopper.
  • the stopper has a horizontal threaded hole to tighten the mag-rest plug to the screwed end of a pressure button shaft.
  • Drilled vertical crossing hole to accomodate a pin tool for gripping the plug.
  • the upper position of the hole view may be used as a reference mark to verify the correct horizontal position of the semi-cylindrical cavity at the tip of the mag-rest.
  • the first insert shown in Fig. 14 is suitable for aluminium arrow shafts, size 1916, and planned for the standard 125 grains weight.
  • the second insert shown in Fig. 15 is suitable for A.C.E. arrow shafts and planned for varying its weight from 80 grains to 90 grains. Weight change is achieved by increasing the number of lead bullets housed in the appropriate tip cavity after removing the screwed point cap.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Magnetic Treatment Devices (AREA)
  • Telescopes (AREA)

Abstract

Le système selon l'invention, qui est applicable à tous les arcs disponibles dans l'archerie, permet de supprimer les interférences apparaissant au cours de la propulsion de la flèche à proximité de l'arc. Les repose-flèches, utilisés jusqu'à maintenant qui soutiennent le fût de la flèche sont remplacés par une suspension mécanique fonctionnant dans toutes les phases de traction précédant la position d'allongement maximum et par une suspension magnétique qui remplace la suspension mécanique et devient active dans ladite position finale. Le support mécanique est assuré par un klicker de forme appropriée qui pourrait être rétractible après le relâchement. L'insert à pointe de la flèche qui est fabriqué dans un matériau ferromagnétique est conçu pour supporter la flèche à l'extrémité de sa course guidée entre les pièces polaires d'un aimant. Une fois la corde relâchée, l'effet magnétique cesse lorsque l'insert à pointe de la flèche quitte le champ magnétique des forces d'attraction. Ainsi, la flèche sera propulsée sans interférence.
PCT/IT1994/000038 1993-05-31 1994-03-30 Systeme de suspension de fleche mecanique-magnetique sans interference WO1994028368A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP94914550A EP0701681A1 (fr) 1993-05-31 1994-03-30 Systeme de suspension de fleche mecanique-magnetique sans interference

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITPE93A000002 1993-05-31
IT93PE000002A IT1268447B1 (it) 1993-05-31 1993-05-31 Sistema meccano-magnetico di sospensione frecce privo di interferenza per arceria.

Publications (1)

Publication Number Publication Date
WO1994028368A1 true WO1994028368A1 (fr) 1994-12-08

Family

ID=11392927

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IT1994/000038 WO1994028368A1 (fr) 1993-05-31 1994-03-30 Systeme de suspension de fleche mecanique-magnetique sans interference

Country Status (3)

Country Link
EP (1) EP0701681A1 (fr)
IT (1) IT1268447B1 (fr)
WO (1) WO1994028368A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2950687A1 (fr) * 2009-09-29 2011-04-01 Arc Systeme Systeme de maintien d'une fleche dans l'axe de poussee de la corde d'un arc
US9366510B1 (en) 2015-01-20 2016-06-14 Gold Tip, Llc Adaptor assemblies for arrow assemblies and arrow assemblies including adaptor assemblies

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3499414A (en) * 1967-12-07 1970-03-10 Arthur J Frydenlund Arrow holder and release signal device for a bow
US3669059A (en) * 1971-01-02 1972-06-13 Frank T Stuart Clacker for attachment to archery bow
US4343286A (en) * 1979-04-06 1982-08-10 Thacker Bobby J Archery bow
US4648376A (en) * 1985-06-28 1987-03-10 Saunders Charles A Self cleaning pressure button
DE8812113U1 (de) * 1988-09-24 1988-11-17 Wiendahl, Joachim, 4600 Dortmund Pfeilanlage an einem Bogen
US4860719A (en) * 1987-11-05 1989-08-29 Anthony J. Czaja Magnetic hold-down device for crossbow

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3499414A (en) * 1967-12-07 1970-03-10 Arthur J Frydenlund Arrow holder and release signal device for a bow
US3669059A (en) * 1971-01-02 1972-06-13 Frank T Stuart Clacker for attachment to archery bow
US4343286A (en) * 1979-04-06 1982-08-10 Thacker Bobby J Archery bow
US4648376A (en) * 1985-06-28 1987-03-10 Saunders Charles A Self cleaning pressure button
US4860719A (en) * 1987-11-05 1989-08-29 Anthony J. Czaja Magnetic hold-down device for crossbow
DE8812113U1 (de) * 1988-09-24 1988-11-17 Wiendahl, Joachim, 4600 Dortmund Pfeilanlage an einem Bogen

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2950687A1 (fr) * 2009-09-29 2011-04-01 Arc Systeme Systeme de maintien d'une fleche dans l'axe de poussee de la corde d'un arc
US9366510B1 (en) 2015-01-20 2016-06-14 Gold Tip, Llc Adaptor assemblies for arrow assemblies and arrow assemblies including adaptor assemblies

Also Published As

Publication number Publication date
ITPE930002A1 (it) 1993-08-31
EP0701681A1 (fr) 1996-03-20
IT1268447B1 (it) 1997-03-04
ITPE930002A0 (it) 1993-05-31

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