FR2885303A1 - GOLF CLUB HEAD IN DIEDRE HOLLOW - Google Patents

Abstract

The present invention relates to a golf club, whose "club head" has the particularity of being insensitive to the so-called "Open" and "Closed" orientations thus allowing the user to control his "club path". The subject of the invention is therefore a "golf head with hollow dihedron" (1), characterized in that it comprises a striking surface (2) facing the ball, which has the shape of a a hollow inner dihedral, whose value of its angle is such, that its projected value "Phi" in the plane of space "P" which includes the tangent to the curve of the trajectory of the ball just at the moment of the impact of the clubhead with the ball, worth Phi = (pi / 2) radians.

Description

The present invention relates to a golf club, whose club head has

  the particularity of being insensitive to the so-called Open and Closed orientations thus allowing the user to control his club path.

  A conventional golf club has a club head, whose shape of the striking surface is such that the trajectory of a ball is affected by the relative orientation of the clubface with respect to the trajectory described by the path. of the club .

  Knowing that the direction of a straight trajectory of a ball depends on the control of the club path by the user, we understand all the difficulties encountered by golfers to control their movement. Indeed, if the face 15 of the club is involuntarily, either open or closed instead of being in normal orientation at the time of impact, well, the trajectory of the ball will not correspond horizontally to that which has been wanted by the club path.

  The invention aims to create a golf club head that has the distinction of making the trajectory of the ball, only associated with the trajectory of the club path in space, regardless of the Open, Normal or Closed orientation of the ball. striking surface of the clubhead.

As examples:

  - Figure 1 presents, a golf club which, according to the invention, has a club head (1) whose striking surface has the shape of a hollow dihedron (2). This club head, according to the invention, in what follows is called hollow dihedral clubhead. The hollow dihedral club head according to the invention has a location (3) provided with a hole in which the handle (4) is fixed. To take control of the club, the handle has a handle (5). 25

  - Figure.2 shows, according to the invention, a first variant of the hollow dihedral clubhead which can replace a conventional clubhead called Iron.

  Figure 3 shows, according to the invention, a second variant of the hollow dihedral club head which can replace a conventional club head called Wood.

  - Figure.4 shows, according to the invention, a third variant of the hollow dihedral clubhead which can replace a conventional clubhead called Driver. A driver is close to a wood, but big volume.

  Figure 5 shows, according to the invention, a fourth variant of a hollow dihedral club head which can replace a conventional club head called Putter.

  The invention therefore relates to a golf club head (1), characterized in that it comprises a striking surface facing the ball, which has the shape of a hollow inner dihedral, the value of which of its angle is such that its projected value D in the plane of the space P which includes the tangent to the curve of the trajectory of the ball just at the moment of the impact of the clubhead with the ball, is ( D = 90 (ninety degrees) or (D = (7c / 2) radians as shown in Figures 1,2,3,4 and 5.

  Figure.6 makes it possible to locate the plane (P); it shows: a ball (J) at the start of the stroke by the clubhead, the trajectory (S) of the ball in space, - the tangent (T) to the trajectory at the starting point of the ball, the plane (P) which contains the tangent (T), the projection (U) on the ground, of the trajectory of the ball in the space. 40

  The value of = (n / 2) radians of the angle in the plane (P) is very important, as shown by the following mathematical proof, with which Figures 7 and 8 are associated.

  In what follows, the word radian is replaced by its symbol rd. Mathematical demonstration: Figure 7 shows in the plane (P), according to the invention, the profile of the striking surface (2) of the hollow dihedral club head with the rear part in partial view, that is: o ( J) the position of the ball at the moment of impact by the hollow dihedral clubhead, o (AB) then (B) one of the three possible courses of the ball following the impact.

  The first part of the demonstration will show that, according to the invention, if the angle 1 = (n / 2) rd, the trajectory (BF) of the ball, seen from above, is parallel to the displacement (DG) of the clubhead.

  The second part of the demonstration will prove, according to the invention, that if the clubhead is in Open or Closed orientation at the moment of impact, the direction of movement of the ball, viewed from above, always remains parallel to the displacement. (DG) seen from above, from the clubhead; this displacement (DG) is commonly called club path.

  First part of the demonstration Figure.7 Assumptions: - (NA) perpendicular to (OC) and (MB) perpendicular to (OD), - (EA) parallel to (DG); (OQ) bisector of the angle COD, therefore (OQ) parallel to (EA), OB = cl) = (n / 2) rd; AO Q = (n / 4) rd We prove that: - É N = (n / 4) rd, according to the law of reflection BAN = (n / 4) rd, so O = (71/4) rd O = (n / 4) rd since the sum of the angles of a triangle is equal to n rd, So M = (n / 4) rd, according to the law of reflection FBMV = (ic / 4) rd Conclusion of the first part of the demonstration: - (BF) is parallel to (EA) and consequently (BF) is parallel to (DG), In other words, the trajectory of the ball (BF) is parallel to the club path; (BF) // (DG).

  Second part of the demonstration Figure.8 Assumptions: - The clubhead is for example in Closed orientation and for the demonstration, the orientation is of value a.rd - (NA) perpendicular to (OC) and (MB ) perpendicular to (OD), - (EA) parallel to (DG); (OQ) angle bisector COD,

VS

  - AOB = cry = (7z / 2) rd, - AOQ = (71/4) rd It is shown that: - EAN = (n / 4) rd + a.rd, according to the law of reflection BAN = ( n / 4) rd + a.rd, - 5 therefore, BAO = (n / 4) rd - a.rd, - ABO = (7r / 4) rd + a.rd, since the sum of the angles of a triangle is equal to 7r rd, - So, ABM = (7r / 4) rd - a.rd, according to the law of reflection MBF = (n / 4) rd - a.rd, - In the triangle ABR, B = NBAN + abii + 1)

BF

  ARB = n - [(t / 4) rd + a.rd + (n / 4) rd - a.rd + (7r / 4) rd - a.rd] ARB = (n / 4) rd + a.rd = EAN = EAR The angles put E R are alternate-internal.

  According to the theorem of geometry which says that two parallel lines intersected by the same secant line give angles alternates-internals which are equal, which is the case of the demonstration which has just been made. It is concluded that the straight lines (EA) and (BF) intersected by the secant (AR) are parallel.

----

  As the direction of movement of the club (DG) is, by -1. hypothesis, parallel to (EA), one can write (EA) II (BF) II (DG).

  Conclusion of the second part of the demonstration When the dihedral club head according to the invention is oriented Closed or Open or in the Normal position, the trajectory of the ball is contained in a vertical plane of the space, which remains always parallel to the club path! The hollow dihedral club head, according to the invention, annihilates the involuntary effects given to the ball by an unsuitable grip; the grip being the way to hold the golf club with your hands. - 6

  For information purposes, an experimental golf club has been produced, according to the invention, with a hollow dihedral clubhead.

  For the experiment: - the value of the opening angle (loft) corresponded to that of a classic golf club type FER N 5, - bullets were struck in three situations, o NORMAL orientation of the head hollow dihedral club; a.rd = 0, o CLOSED orientation of the hollow dihedral clubhead; a.rd = - 35 o OPEN orientation of the hollow dihedral clubhead; a.rd = + 35.

  The observation showed that the trajectory of the bullets was perfectly parallel to the crossing of the club path.

  Note that the comparative tests conducted with a conventional golf club (FER N 5) under the same conditions of Open and Closed orientation +135 showed that the balls were shifted laterally from the target by an order of magnitude of 35 meters! The heads of hollow dihedral clubs, according to the invention Figures.1 to 5 and 11 to 15, have the edge (ef) of their corner dihedron at the apex 'D, which has a so-called opening angle or loft as shown in Figures 9 and 10. This angle 0 may range from 9 = 0 to 0 <90 If a particular golf club has, according to the invention, a hollow dihedral club head, which at an opening angle θ which is zero, then the plane (P) is parallel to the ground.

  FIGS. 11 to 15 show, by way of example, variants of FIGS. 1 to 5 of the hollow dihedral club head in partial view and from above: FIG. 11 shows the corner angle D of which the vertex is not truncated, Figure 12 shows the dihedron angle cp whose vertex is truncated by a small plane surface, Figure 13 shows the dihedron angle i whose vertex is truncated by a small surface Figure 14 shows the dihedral angle D, according to one of the variants Figures 11 to 13, which is provided at its upper part with a marker blade (7). FIGS. 1 to 5 and 11 to 14 in that the two faces (2) of the corner dihedron D have streaks (6), - another variant, not shown, of Figures 1 to 5 and 11 to 15 in that the two faces (2) of the corner dihedron (D are made adherent by the deposition of a substance or by a modification of the state of the surfaces, - Another variant, not shown, of Figures 1 to 5 and 11 at 15 in that the angle cb of the dihedral is adjustable by mechanical means.

Claims (2)

8 claims   1) Device, golf club head with hollow dihedron (1), whose particularity is to be insensitive to the so-called Open or Closed orientations, characterized in that it comprises, a striking surface (2), facing the ball, which has the shape of a hollow inner dihedral, whose value of its angle is such that its projected value (D in the plane of the space P which includes the tangent to the curve of the trajectory of the ball just at the moment of impact of the clubhead with the ball, is worth (D _ (it / 2) radians.   2) Device golf club head with hollow dihedron, according to claim 1, characterized in that its shape other than the corner dihedron (D, is of any shape.   3) Apparatus, hollow-dipped golf club head, according to any one of claims 1 and 2, characterized in that it has a location (3) provided with a hole for receiving the handle (4).   4) Device, hollow-dipped golf club head, according to any one of the preceding claims, characterized in that the edge of the corner dihedron (1 is truncated.   5) Device golf club head with hollow dihedron, according to any one of the preceding claims, characterized in that its upper portion 30 is provided with a marker blade (7).   6) device golf club head with hollow dihedron, according to any one of the preceding claims, characterized in that the two faces (2) of the corner dihedron c have ridges (6).   7) Apparatus, golf club head with hollow dihedron, according to any one of the preceding claims, characterized in that the two 40 faces (2) of the corner dihedron (D are made adherent by the deposition of a substance , by a modification of the surface condition or both.   8) device golf club head with hollow dihedron, according to any one of the preceding claims, characterized in that the angle 1 of the dihedral is adjustable by mechanical means.   9) Apparatus, hollow-dipped golf club head, according to any one of the preceding claims, characterized in that it comprises a handle (4) and a handle (5). 15 20 25 30 35