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Weight-adjustable golf club head provided with rear lightweight coveringWeight-adjustable golf club head provided with rear lightweight covering description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20080070721, Weight-adjustable golf club head provided with rear lightweight covering. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND OF THE INVENTION [0001]1. Field of the Invention [0002]The present invention relates to a weight-adjustable golf club head provided with a rear lightweight covering. Particularly, the present invention relates to the rear lightweight covering of the golf club head made from a low specific gravity metal. More particularly, the present invention also relates to the rear lightweight covering of the golf club head having an inner surface formed with reinforcing ribs. [0003]2. Description of the Related Art [0004]A conventional golf club head, as described in U.S. Pat. No. 6,783,465, entitled "GOLF CLUB HEAD," includes a golf club head body and a striking plate. The golf club head body has a front portion, a crown portion and a sole portion. Furthermore, the golf club head body includes a heel side portion and a toe side portion opposite thereto. The striking plate is connected with the front portion of the golf club head body. To enhance elastic deformability, a series of recessed grooves are provided on the crown portion of the golf club head. In this case, each of the recessed grooves extends along a club-head-width direction from the heel side portion and the toe side portion of the crown portion; namely, each of the recessed grooves is arranged to extend along the direction substantially parallel to a horizontal reference line of the striking plate. Such a structure of the recessed groove can enhance the deformability of the golf club head body while impacting a golf ball. [0005]In addition to this, a series of protruded ribs are provided on the sole portion of the golf club head body so as to reinforce structural strength. However, there would be further advantageous that the protruded ribs can lower a center of gravity of the golf club head body for enhancing stability in striking the golf ball. Accordingly, the hitting characteristics of such a structure of the golf club head are enhanced. [0006]In general, such an arrangement of the golf club head body has several drawbacks. For example, the crown portion of the golf club head body has a total thickness greater than a depth of the recessed groove provided thereon. Although these recessed grooves can be successful in enhancing elastic deformability of the crown portion of the golf club head body, a number of design limitations exist for lowering the center of gravity of the golf club head body due to difficulties in manufacture. A design-limiting problem due to a depth of the recessed groove is an increase of the thickness of the crown portion. However, it would be disadvantageous to provide a thinner thickness of the crown portion and to lower the center of gravity of the golf club head body. [0007]Another problem with providing the recessed groove is the difficulty in increasing the strength of the crown portion. During use of the golf club head body in impacting the golf ball, the crown portion is susceptible to distortion or crack due to an ultimately thin thickness of the crown portion existing right in the recessed groove. By way of example, there is a need to provide means for reinforcing the thin-thickness portion of the crown portion if the thickness is less than 0.6 mm. Hence, there is a need for improving the crown portion of the golf club head body. [0008]Another problem with the direction of extending the recessed groove across the golf club head width is susceptible to weakening the entire structure of the golf club head body. Furthermore, another problem occurring during impacting the golf ball is a loss of the adequately elastic deformability of the crown portion due to the stress transmitting in a front-to-rear direction of the golf club head. [0009]As is described in greater detail below, the present invention intends to provide a weight-adjustable golf club head provided with a rear lightweight covering which is made from a low specific gravity metal so as to reduce weight of a crown portion and a rear portion of the golf club head. The rear lightweight covering has a rear crown portion and a rear wall portion to combine with a golf club head body which has a striking plate and a sole portion. The rear lightweight covering reduces the entire weight and simplifies the entire structure of the golf club head in such a way as to mitigate and overcome the above problem. SUMMARY OF THE INVENTION [0010]The primary objective of this invention is to provide a weight-adjustable golf club head provided with a rear lightweight covering which has a relatively thin thickness and is made from a low specific gravity metal. The rear lightweight covering has an extension to form a rear wall portion. Accordingly, the rear lightweight covering can lower the center of gravity and reduce the weight of the golf club head. [0011]The secondary objective of this invention is to provide a weight-adjustable golf club head provided with the rear lightweight covering. The rear lightweight covering is integrally formed with a rear crown portion and a rear side wall portion, and is combined with a golf club head body which is designed to integrally form with a striking face and a sole portion. Accordingly, the rear lightweight covering can simplify the entire structure of the golf club head. [0012]Another objective of this invention is to provide a weight-adjustable golf club head provided with the rear lightweight covering. The rear lightweight covering has an inner surface formed with reinforcing ribs. Accordingly, the rear lightweight covering can lower the center of gravity and enhance the strength of the golf club head. [0013]Another objective of this invention is to provide a weight-adjustable golf club head provided with the rear lightweight covering which has an inner surface formed with reinforcing ribs which extend along a front-to-rear direction of the golf club head. Accordingly, the rear lightweight covering with such reinforcing ribs can enhance elastic deformability of the golf club head in impacting a golf ball. [0014]The weight-adjustable golf club head in accordance with an aspect of the present invention includes a rear lightweight covering and a golf club head body combined therewith. The rear lightweight covering has a rear crown portion and a rear wall portion extended therefrom. The golf club head body is combined with the rear lightweight covering which is designed to have a striking face, a front crown portion and a sole portion. The rear lightweight covering is made from a low specific gravity metal, and is designed to have a thickness less than 0.6 mm. The rear lightweight covering has an inner surface formed with a plurality of reinforcing ribs. [0015]In a separate aspect of the present invention, the reinforcing ribs extend along a front-to-rear direction of the golf club head. [0016]In a further separate aspect of the present invention, the reinforcing rib adjacent to a center portion of the rear crown portion of the rear lightweight covering has a greater length. [0017]In a yet further separate aspect of the present invention, the reinforcing ribs are formed on an outer surface of the rear lightweight covering. [0018]Further scope of the applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various will become apparent to those skilled in the art from this detailed description. BRIEF DESCRIPTION OF THE DRAWINGS [0019]The present invention will become more fully understood from the detailed description given hereinbelow and the accompanying drawings which are given by way of illustration only, and thus are not limitative of the present invention, and wherein: [0020]FIG. 1 is an exploded perspective view illustrating a weight-adjustable golf club head having a rear sectional lightweight covering in accordance with a preferred embodiment of the present invention; [0021]FIG. 2 is a top elevational view illustrating the weight-adjustable golf club head combined with the rear sectional lightweight covering in accordance with the preferred embodiment of the present invention; and Continue reading about Weight-adjustable golf club head provided with rear lightweight covering... 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