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Set of golf clubsRelated Patent Categories: Games Using Tangible Projectile, Golf, Club Or Club Support, Club Set, Particular Correlated Head Characteristic, Mass DistributionSet of golf clubs description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070032308, Set of golf clubs. Brief Patent Description - Full Patent Description - Patent Application Claims
TECHNICAL FIELD [0001] The invention relates to the field of golf. It relates more specifically to heads of golf clubs of the "iron" type. It is aimed more specifically at irons which have a rear cavity, the geometry of which optimizes the distribution of mass while at the same time maintaining excellent striking qualities. PRIOR ART [0002] In general, golf clubs in which the head is made of cast or forged metal are known as "irons". Iron heads all have a flat striking face, the inclination of which varies with the number of the iron in the set. Thus, irons with low numbers, that is to say from 1 to 4, also known as "long irons" have a striking face which is not as inclined with respect to the vertical as irons known as "short irons", which have a high number in the set, that is to say 8, 9 and PW. [0003] One of the objectives in improving the tolerance of an iron consists in distributing the weight of the head at the perimeter, around the center of the striking face. The center of the striking face, corresponding to the ideal zone of impact, also known as the "sweet spot" is wider, the more the weight is distributed around the perimeter. [0004] This is why a certain number of clubs have already been proposed in which the head has a rear cavity delimited by walls extending backward behind the striking face. This cavity can also, as a side issue, accommodate various decorative or functional elements. [0005] Amongst the walls delimiting the rear cavity, the lower wall forms what is generally known as the "sole", the lower face of which faces the ground at the time of the strike. The cavity is also delimited by an upper wall that the golfer has in his field of view when he prepares the hit and strikes the ball. The cavity is also delimited by two lateral walls, the first being situated on the side of the head connecting to the shaft, also known as the "heel", the second wall being situated on the opposite side, generally known as the "toe". The set of walls delimiting the cavity is generally known as the "perimeter". [0006] The peripheral shape of the peripeter distributes some of the mass of the head at the perimeter, thus widening the "sweet spot" and increasing the tolerance of accuracy. [0007] It has already been proposed for the perimeter to be given special shapes intended to improve the mass distribution still further, particularly by increasing the mass of the lower wall that forms the sole, and as a counterpart, by reducing the mass of the upper wall. Thus, document U.S. Pat. No. 5,048,834 describes a golf club which has a rear cavity, in which the lower wall of the perimeter has a protuberance directed toward the interior of the cavity, and which therefore increases the mass of the bottom part of the head. This solution increases the weight of the bottom part of the head, but has the disadvantage of stiffening the central zone of the striking face and therefore of reducing the "sweet spot" and therefore of providing results which are merely mediocre in terms of tolerance. [0008] It has also been proposed, in document U.S. Pat. No. 5,437,456, for the walls of the perimeter to be hollowed out to the rear of the striking face, at the zone where they meet the bottom of the cavity. This solution decreases the mass of the head in the immediate vicinity of the striking face and offsets some of this mass further toward the rear of the striking face. The head described in that document also comprises slots opening onto the upper and lower surfaces of the head. These slots produce a marked separation between the upper, lower and lateral walls. This solution has the disadvantage of weakening the perimeter through the presence of these slots. The rear walls thus separated also have a greater tendency to vibrate, which may constitute an impediment for the golfer. In addition; the slots located on the upper face of the head are visible to the golfer, and are a visual annoyance to him. [0009] The objective of the invention is to provide a golf club head which simultaneously makes it possible to distribute the mass within the perimeter with preference to the lower wall forming the sole, while at the same time maintaining a good width of sweet spot in order to ensure good tolerance. It is also important that such a distribution is optimized for each club of a set. SUMMARY OF THE INVENTION [0010] The invention therefore relates to a set of golf clubs of the "iron" type, the rear face of the head of each club has a cavity delimited by walls, namely at least one lower wall forming the sole and an upper wall. [0011] The upper wall has several faces, namely a rear face, an upper face, a lower face facing the cavity and lateral faces. [0012] According to the invention, several golf clubs of the set has a head which has at least one recess made in the upper wall and opening onto a single face of said upper wall, away from the upper and lower faces. [0013] In other words, the upper wall delimiting the cavity is hollowed out to reduce the weight of this upper part. In consequence, the distribution of mass within the perimeter privileges the lower wall. By opening onto a single wall, the characteristic recesses do not weaken the perimeter. [0014] The recesses made in the upper wall may open at various points, except for the upper face, this being so as not to be visible in the field of view of the golfer, so as not to disturb him as he prepares and makes the hit. [0015] Thus, the characteristic recess or recesses may open either onto the rear face of the upper wall or alternatively onto a lateral face of this wall, that is to say onto the lateral face of the head. [0016] In other words, the opening of these recesses is located either at the rear of the head or on one of these lateral sides. [0017] If the recess opens onto a lateral face of the head, it will be preferable, for manufacturing reasons, for this to be the lateral face on the toe side of the head. [0018] The characteristic recesses may adopt highly varying shapes, if they open onto a single face of the upper wall. Thus, the recess may be elongate in the main direction of the upper wall. In other words, in the case of recesses opening onto the rear face of the upper wall, the opening of the recess has a longer dimension which is more or less parallel to the upper wall, or which follows its slight curvature when the latter wall is not straight. [0019] When the recess is produced in such a way that it opens onto a lateral face of the club head, it is then hollowed into the actual thickness of the wall, parallel to the upper and lower faces of the upper wall, and also parallel to the striking face. [0020] In one particular embodiment, the recess may be cylindrical, whether this be when it opens onto the rear face of the upper wall or onto a lateral wall thereof. In this case, it may, for example, be achieved by machining by milling, drilling, or alternatively directly by injection. [0021] In order to prevent the recess from becoming filled with earth or any other material that would alter the distribution of mass, it will be preferable for the recess to be filled with a low-density material, such as a polyurethane foam for example, so as to prevent the intrusion of foreign bodies. The filled material is chosen so that it has only an imperceptible effect on the mass distribution. Continue reading about Set of golf clubs... Full patent description for Set of golf clubs Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Set of golf clubs patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Set of golf clubs or other areas of interest. ### Previous Patent Application: Golfer training aid Next Patent Application: Handle structure for ball striking equipments Industry Class: Games using tangible projectile ### FreshPatents.com Support Thank you for viewing the Set of golf clubs patent info. IP-related news and info Results in 0.13471 seconds Other interesting Feshpatents.com categories: Daimler Chrysler , DirecTV , Exxonmobil Chemical Company , Goodyear , Intel , Kyocera Wireless , 174 |
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