A HEAD CONNECTING DEVICE IN GOLF CLUBS

Abstract: This invention relates to a head connecting device in golf clubs, and in particular to a cast iron head on a wooden golf club, such as a driver, a brush, a baff, a creek. The object of this invention is to provide a setting part, i.e. a tube with an eccentric bore which inclines against the axis of the tube and is located between the head and the shaft so that the face angle α of the hit face 1a of head 1 can be adjusted easily by changing the direction or the angle of the setting part.

Description: Field of the Invention This invention relates to a head connecting device in golf clubs, and in particular to a cast iron head on a wooden golf club, such as a driver, a brush, a baff, a creek. Background of the Invention Due to the lack of wood as a raw material, cast iron heads connected to a wooden golf club by means of a shaft have been in use widely in recent times. To adjust the face angle of the head, however, it is necessary to hit the face of the head, thus scraping it. In reconsideration of US-Patent 2,219,670 a golf club is known, the shaft of which being connected at the end of a head by an adapter consisting of the two parts stem and shank respectively. These two parts are separated from each other by a shoulder. The axes of the separate parts are arranged in an inclined position against each other. For connecting the shaft there is provided a bore in the stem, said bore being arranged coaxially to the stem. An inclined position is to be found only between the bore and the shank. These both parts are connected to one single part, however they do not have straight form but are arranged in an angle. Thus they form a new part of complicate shape and of a relatively long dimension. In WO-A- 88/03427 defining the most relevant state of the art according to Article 54(3) EPC in connection with Articles 89 and 158(1) EPC a setting part for a golf club is described, said setting part consisting of a member of straight aligned cylindrical shape having a bore arranged in a manner that the axis of the bore is in an inclined position with respect to the axis of the cylinder. The setting part is inserted into the head of the club as is the shaft into the bore of the setting part. By rotation of the setting part the angle of inclination is varied and any desired face angle of the head may be adjusted. Brief description of the Invention The object of this invention is to eliminate this above mentioned drawback and to improve the connection of head and shaft in order to enlarge adjustability by installing a setting part in the form of a tube with an eccentric bore which inclines against the axis of the tube so that the face angle α of the hit face 1a of the head 1 can be adjusted easily by changing the angle of the setting part. The object of the present invention is to provide a head connecting device in golf clubs with a sleeve part for connecting a shaft at the end of the head, comprising a single-piece setting part mounted on the sleeve part of the head and having a circular bore for inserting a shaft is provided on the setting part in inclined position against the axis of the setting part. The desired result is achieved in that several kinds of setting parts of straight sleeve shape are provided in an interchangeable manner, the direction or angle of the circular bore differing from each other, each setting part being fitted with a flange at the upper end. The above and other features of this invention will be fully understood from the following and detailed description and accompanied drawings in which. Brief Description of the Drawings Fig.1 (a) is a front view of an embodiment of this invention. Fig.1 (b) is a side view of the embodiment of this invention. Fig.2 is a cross sectional view along A-A line in Fig.1 (a). Figs.3 (a) (b) (c) are longitudinal cross sectional views of the setting sleeves. Detailed Description of the Invention Referring to Figs. 1-3, in the embodiment of the present invention, the head connecting device in golf clubs comprises a sleeve part 3 for connecting a shaft 2 at the end of the head 1, a setting part 5 of sleeve shape mounted on the sleeve part 3 of the head 1, a circular bore 6 for inserting a shaft 2 is provided on the setting part 5 in inclined direction against the axis of the setting part 5. Said setting part 5 and shaft 2 are attached to the head 1 by a screw 10 inserted from the outside of the head 1. An adhesive agent may be used instead of the screw 10. The setting part 5 has a flange 5a at the upper end, and the flange 5a has a recess 5b for rotation. The outer diameter of the setting part 5 is 10mm, the inner diameter of the bore 6 is 8mm, the depth of the bore 6 is 30 mm. As shown in Figs. 3 (a) (b) (c), three kinds of the setting parts 5 are provided. Thicknesses t of the setting parts 5 at the lower end are 1mm, 0,6 mm, 0,3mm respectively. The shaft 2 is inserted at a depth of 35mm. To connect shaft 2 to head 1, a setting part 5 is inserted into the sleeve part 4 of sleeve part 3 of the head 1. The position of the setting screw is then changed by turning the screw. The position of bore 6 and shaft 2 is changed in order to alter the position of head 1 to shaft 2. Thus, face angle can be adjusted without scraping the face.

Claims: A head connecting device in golf clubs with a sleeve part (3) for connecting a shaft (2) at the end of the head (1), comprising a single-piece setting part (5) mounted on the sleeve part (3) of the head (1) and having a circular bore (6) for inserting a shaft (2) on the setting part (5) in inclined position against the axis of the setting part (5), characterised in that several kinds of setting parts (5) of straight sleeve shape are provided in an interchangeable manner, the direction or angle of the circular bore (6) differing from each other, each setting part (5) being fitted with a flange (5a) at the upper end.

Inventors: YAMADA, KUNIO
Applicants: YAMADA, KUNIO
Application year: 1988
Main classification: A63B53
IPC codes: A63B53