WO2006117452A1

WO2006117452A1 - Golf club head with a hollow dihedral

Info

Publication number: WO2006117452A1
Application number: PCT/FR2006/000941
Authority: WO
Inventors: Guy Michelet
Original assignee: Guy Michelet
Priority date: 2005-05-04
Filing date: 2006-04-27
Publication date: 2006-11-09
Also published as: FR2885303A1

Abstract

The invention relates to a golf club, specifically a Fer , Bois de parcours and Driver type of golf club, the head of the club being particularly insensitive to open and closed orientations, thus enabling the user to control the course of the club. The invention thus especially relates to a Fer , Bois de parcours and Driver (1) golf club head with a hollow dihedral, characterised in that it comprises a hitting surface (2), facing the ball, which has the form of a hollow inner dihedral, the value of the angle thereof being such that the projected value « F » thereof in the plane of the region « Φ » comprising the tangent to the curve of the trajectory of the ball at the moment of impact of the head of the club with the ball, is equal to Φ = (π/2) radians.

Description

GOLF CLUB HEAD IN DIEDRE HOLLOW

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" when of a swing.

A classic golf club, such as Irons, Fairway Woods and Drivers, has a "club head", which has the shape of the striking surface, so that the trajectory of a ball is affected by the relative orientation of the ball. the face of the club in relation to the path described by the "club path" during a swing.

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 that golfers encounter in controlling their movement. If the face of the club is unintentionally either open or closed instead of being in "normal orientation" at the moment of impact, 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, for Irons, Woods and Drivers, which has the distinction of making the trajectory of the ball, only associated with the path of the path of the club in space , regardless of the "Open, Normal or Closed" orientation of the "clubhead" striking surface during a swing. As examples:

- Figure 1 presents, a golf club which, according to the invention, has a "club head" (1) whose striking surface has the forrrte 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). - 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 clubhead" which can replace a conventional clubhead called "Wood".

- Figure.4 shows, according to the invention, a third variant of the

"Hollow dihedral clubhead" which can replace a classic club head called "Driver". A "driver" is close to a wood, but big volume.

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 "Φ" in the plane of 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 bullet, is Φ = 90 ° (ninety degrees), ie Φ = (π / 2) radians as shown in Figures 1,2,3 and 4.

Figure.5 makes it possible to locate the plane (P); she shows :

- a ball (J) at the start at the moment of the shot 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 bullet in space. The value of Φ = (π / 2) radians of the angle in the plane (P) is very important, as shown by the following mathematical proof, with which Figures 6 and 7 are associated.

In what follows, the word radian is replaced by its symbol "rd".

Mathematical demonstration:

- Figure.6 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,

- either: o (J) the position of the ball at the moment of impact by the

"Hollow dihedral clubhead", o (AB) then (BF) one of 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 Φ = (π / 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 "club head" is in "Open or Closed" orientation at the moment of impact, the direction of movement of the ball, viewed from above, remains always parallel to the movement (DG) seen from above, from the clubhead, this displacement (DG) is commonly referred to as the club path.

First part of the demonstration Fiqure.β

Hypotheses :

- (NA) perpendicular to (OC) and (MB) perpendicular to (OD), - (EA) parallel to (DG); (OQ) bisector of the angle COD, therefore (OQ) parallel to (EA),

- ^" AOB ^" = Φ = (π / 2) rd; ^ Ô0: = (π / 4) rd

5 It is shown that:

- ^" EAKT = (π / 4) rd, according to the law on reflectioni3ÂKT = (π / 4) rd,

- so ^" BÂÔ ^" = (π / 4) rd

₁₀ - ^" ABO ^" = (π / 4) rd since the sum of the angles of a triangle is equal to π rd,

- So, ^" ABM ^" = (π / 4) rd, according to the law on the reflexion ^"" FBl \ 7ï = (π / 4) rd

15

Ç9Ji Lysi ° ^c π-La jpartie first demonstration:

- (BF) is parallel to (EA) and consequently (BF) is parallel to (DG),

^ ^u - In other words, the trajectory of the ball (BF) is parallel to the

"Club path"; (BF) // (DG).

25 Part Two of the Demonstration Figure.8

Hypotheses :

- The club head is for example in "Closed orientation" and for the demonstration, the orientation is of value "α.rd" or

- (NA) perpendicular to (OC) and (MB) perpendicular to (OD),

- (EA) parallel to (DG); (OQ) bisecting the angle ^"Coe

- AOB ^" = Φ = (π / 2) rd,

35 -----.

- AOQ = (π / 4) rd

We show that:

40 - ^" EAKT = (π / 4) rd + α.rd, according to the law on reflection

^" BAKT = (π / 4) rd + α.rd, - So, BAO = (π / 4) rd - α.rd,

- ABO = (π / 4) rd + α.rd, since the sum of the angles of a triangle is equal to π rd,

- J3on, ^" ABÎVf = (π / 4) rd - α.rd, according to the law of reflection ⁵ MBF = (π / 4) rd - α.rd,

- In the triangle ABR,

^" ARB ~ = π - (BA ^ + A ^ KMÎBF) 10 ^" ARB ^" = π - [(π / 4) rd + α.rd + (π / 4) rd - α.rd + (π / 4) rd - α.rd]

TvRB ^" = (π / 4) rd + α.rd = ^" EÂN ^" = ^" ÊÂR ^" The angles ÂRB ~ éf1ËÂR ^~ are alternate-internal.

₅ ^ According to the theorem that says, "that two straight parallel cut by the same straight intersecting give alternate angles are equal ', which is the case of the demonstration that was just made. It is concluded that the rights

20

(EA) and (BF) cut by secant (AR), are parallel.

Since the direction of movement of the club (DG) is, in theory, parallel to (EA), one can write (EA) // (BF) // (DG).

Conclusion of the second part of the demonstration

₃ Q When the "club head hollow dihedral" according to the invention is oriented "Closed" or "Open" or "normal" position, the trajectory of the ball is contained in a vertical plane of the space, which always remains parallel to the "club path"!

35

The "hollow dihedral clubhead", 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. 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 "IRON No. 5", - bullets were struck in three situations, o orientation " NORMAL "of the" hollow dihedral clubhead "; α.rd = 0 °, o "CLOSED" orientation of the "hollow dihedral clubhead"; α.rd ≈ - 35 ° o "OPEN" orientation of the "hollow dihedral clubhead"; α.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 classical golf club (IRON No. 5) under the same conditions of orientation "Open and Closed +/- 35 °" showed that the balls were shifted laterally from the target of an order of magnitude of 35 meters!

The "heads of hollow dihedral clubs", according to the invention, Figures 1 to 4 and 10 to 14, have the edge (ef) of their angle dihedron at the top "Φ", which has an angle "θ "Opening" or "loft" as shown in Figures 8 and 9. This angle "θ" can take a value between "θ = 0 °" and "θ <90 °" If a golf club In particular, according to the invention, a "hollow dihedral club head" has an opening angle "θ" which is zero, whereas the plane (P) is parallel to the ground. Figures 10 to 14 show, by way of example, variants of Figures 1 to 5 of the "hollow dihedral clubhead" in partial view and from above:

- Figure 10 shows the corner dihedron "Φ" whose vertex is not truncated, - Figure.11 shows the corner dihedron "Φ" whose vertex is truncated by a small flat surface,

- Figure 12 shows the corner dihedron "Φ" whose top is. _j Q truncated by a small curved surface,

- Figure 13 shows the corner dihedron "Φ", according to one of the variants Figures.10 to 12, which is provided at its upper part with a "marker blade" (7),

FIG. 14 shows a variant of FIGS. 1 to 4 and 10 to 14 in that the two faces (2) of the corner dihedron "Φ" have ridges (6),

²⁰ - Another alternative, not shown, of Figures.1 to 4 and 10 to

14 in that the two faces (2) of the corner dihedron "Φ" are made adherent by the deposition of a substance or by a

Changing the state of the surfaces,

Another variant, not shown, of Figures 1 to 4 and 10 to

15 in that the angle "Φ" of the wedge is adjustable by means _{^ 0} mechanics.

35

40

Claims

REVEND1CATIONS

1) Device, "golf head hollow head" (1), type Irons, fairway wood and Drivers, whose particularity is to be insensitive to the orientations known as "Open" or "Closed", characterized in that it includes a striking surface (2) facing the ball, which has the shape of a hollow inner dihedral, the value of its angle is such that its projected value "Φ" 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 Φ = (π / 2) radians.

2) Device, "hollow-dipped golf club head", according to claim 1, characterized in that its shape other than the corner dihedron

"Φ", of any form.

3) Device, "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, "head of golf club hollow dihedron", according to any one of the preceding claims, characterized in that the edge of the corner dihedron "Φ" is truncated.

5) Device, "head of golf club hollow dihedron" according to any one of the preceding claims, characterized in that its upper part is provided with a "marker blade" (7).

6) Device, "head of golf club hollow dihedron", according to any one of the preceding claims, characterized in that the two faces (2) of the corner dihedron "Φ" have ridges (6).

7) Device, "head of golf club hollow dihedron", according to any one of the preceding claims, characterized in that the two faces (2) of the corner dihedron "Φ" are made adherent by the deposit of a substance, by a modification of the surface state or both at the same time. 8) Device, "hollow-dipped golf club head" according to any one of the preceding claims, characterized in that the angle "Φ" of the dihedral is adjustable by mechanical means.

9) Device, "golf head hollow head" according to any one of the preceding claims, characterized in that it comprises a handle (4) and a handle (5).