Patents Assigned to Maruman Golf Kabushiki Kaisha
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Patent number: 5398935Abstract: A golf wood clubhead has a head body having heel and toe portions and face and sole portions which extend between the heel and toe portions, respectively, and define a leading edge at the intersection thereof. The height of the face portion at the side close to the toe portion is nearly equal to or greater than that of the same at the center thereof.Type: GrantFiled: September 15, 1993Date of Patent: March 21, 1995Assignee: Maruman Golf Kabushiki KaishaInventor: Yutaka Katayama
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Patent number: 5324032Abstract: A golf club shaft has a grip portion at which the shaft is to be fitted with a grip, and a tip at which the shaft is to be connected to a club head. The grip portion of the shaft and the neighborhood thereof are made of a composite material comprising a fiber-reinforced synthetic resin layer and a metal layer, while the remaining portion is made of a fiber-reinforced synthetic resin.Type: GrantFiled: August 31, 1993Date of Patent: June 28, 1994Assignee: Maruman Golf Kabushiki KaishaInventor: Masanobu Minami
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Patent number: 5322290Abstract: A golf club grip has a double-layer structure comprising an inner layer and an outer layer aminated on the outer surface of the inner layer. One of the inner and outer layers is made of a first material, while the other layer is made of a second material. The first material has an elasticity which is higher than that of the second material so that the first material is more readily elastically deformable than the second material, while the second material has a viscoelasticity which is higher than that of the first material.Type: GrantFiled: December 27, 1991Date of Patent: June 21, 1994Assignee: Maruman Golf Kabushiki KaishaInventor: Masanobu Minami
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Patent number: 5288079Abstract: A golf wood clubhead has a body having face and sole portions which define a leading edge therebetween. The width from the leading edge of the head body to the rear end of the sole portion is nearly equal to or less than a half of the width from the leading edge of the head body to the rear end thereof. The head body may have a rounded lower back portion of a certain radius of curvature within a region from the rear end of the sole portion to the rear end of the head body. The sole portion may have a rounded surface of the same radius of curvature as that of the rounded lower back portion.Type: GrantFiled: November 27, 1991Date of Patent: February 22, 1994Assignee: Maruman Golf Kabushiki KaishaInventor: Yotaka Katayama
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Patent number: 5280911Abstract: A club head for a golf iron club comprises a head body having an inclined face, a back, and a sole, and heel and toe ends. A neck is connected in one piece with the head body at the heel end thereof for attaching thereto a club shaft. The head body is provided at the intersection of the face and sole thereof with a knife-edged leading edge.Type: GrantFiled: November 7, 1991Date of Patent: January 25, 1994Assignee: Maruman Golf Kabushiki KaishaInventor: Yutaka Katayama
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Patent number: 5269518Abstract: Disclosed is an improved putter whose head and grip weighs 320 to 360 grams and 100 to 260 grams, respectively. The total weight of the head and grip ranges from 445 to 585 grams. The grip-and-head weighting according to the present invention has the effect of improving the rolling of the ball to extend the rolling-and-running distance of the ball; and improving the stableness and directionality of the swing.Type: GrantFiled: December 26, 1991Date of Patent: December 14, 1993Assignee: Maruman Golf Kabushiki KaishaInventors: Masashi Kobayashi, Masanobu Minami, Yoshio Tanabe, Yuuzi Mori
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Patent number: 5233544Abstract: A swing analyzing device comprising swing practice equipment such as a golf club, wherein acceleration sensors are arranged on the shaft or on an axis of the swing practice equipment, or near the axis, and a dynamic quantity representing a movement of the shaft, such as an angular velocity, angular acceleration, and angle of the shaft, is calculated from an output of the acceleration sensors. The acceleration sensors are preferably arranged on the shaft in a spaced apart relationship so that directions of detecting acceleration substantially coincide with an axis of the shaft. A further acceleration sensor can be arranged on the shaft so that a direction of detecting acceleration forms a certain angle with an axis of said shaft.Type: GrantFiled: October 10, 1990Date of Patent: August 3, 1993Assignee: Maruman Golf Kabushiki KaishaInventor: Kazutoshi Kobayashi
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Patent number: 5226652Abstract: A golf club comprising a head having a neck portion, a shaft having a distal end portion attached to the neck portion, and a neck neighboring portion extending above the neck portion at which the shaft is dynamically bent due to an impact of the head with a golf ball during a swing of the golf club. A member is provided in the shaft for increasing a response to the impact. For example, materials having a high elastic modulus under impact is inserted or a section modulus of the shaft is rearranged in the bendable portion. Accordingly, a lower portion of the shaft is initially bent backward relative to the remaining portion of the shaft and then is moved rapidly forward to cause the head to advance while in contact with the golf ball.Type: GrantFiled: June 18, 1992Date of Patent: July 13, 1993Assignees: Maruman Golf Kabushiki Kaisha, Masanori SatoInventor: Masanori Sato
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Patent number: 5160137Abstract: An iron golf club including a head having a hitting surface for hitting a golf ball. In the iron golf club set, a ratio of a first value of the width of the hitting surface on the side of the toe to a second value of the width of the hitting surface on the side of the heel becomes larger as the length of the shaft becomes longer.Type: GrantFiled: March 25, 1992Date of Patent: November 3, 1992Assignee: Maruman Golf Kabushiki KaishaInventor: Yutaka Katayama
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Patent number: 5108105Abstract: A golf practice device comprising a mat with at least two sensors arranged therein in the direction of a swing orbit of a head of a golf club. A swing time substantially from a start of a back swing to a point of an impact with a golf ball is calculated in response to signals output by the sensors, and the result is indicated so that a golfer can observe same and thus achieve a stable swing. It is possible to distinguish an address motion and an actual swing before impact by adapting a special combination of the outputs of the two sensors.Type: GrantFiled: January 16, 1991Date of Patent: April 28, 1992Assignee: Maruman Golf Kabushiki KaishaInventor: Tetsuo Shimizu
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Patent number: 5056788Abstract: An iron golf club including a head with a hitting portion having a hitting surface for hitting a golf ball, a hosel and a connecting wall extending between the hitting portion and the hosel and forming a hosel pocket. In an iron golf club set, the thickness of the hosel pocket wall is made smaller to thin the surface of the wall on the side of the hitting surface as the length of the shaft becomes shorter.Type: GrantFiled: September 1, 1989Date of Patent: October 15, 1991Assignee: Maruman Golf Kabushiki KaishaInventor: Yutaka Katayama
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Patent number: 5000454Abstract: A golf club head is disclosed which comprises a body made of a fiber-reinforced plastic having a back side, a club face, a sole and a hosel. A weight member having a nearly circular configuration is located adjacent to the inner circumference of the back side and at a position lower than the vertical centerline of the club face and a reinforcing member is located adjacent to the inside of the club face.Type: GrantFiled: August 30, 1989Date of Patent: March 19, 1991Assignee: Maruman Golf Kabushiki KaishaInventor: Takeo Soda
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Patent number: D262303Type: GrantFiled: December 7, 1979Date of Patent: December 15, 1981Assignee: Maruman Golf Kabushiki KaishaInventor: Masashi Kobayashi
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Patent number: D263980Type: GrantFiled: December 7, 1979Date of Patent: April 20, 1982Assignee: Maruman Golf Kabushiki KaishaInventor: Masashi Kobayashi
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Patent number: D264488Type: GrantFiled: April 8, 1980Date of Patent: May 18, 1982Assignee: Maruman Golf Kabushiki KaishaInventor: Masashi Kobayashi
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Patent number: D265494Type: GrantFiled: July 1, 1980Date of Patent: July 20, 1982Assignee: Maruman Golf Kabushiki KaishaInventor: Masashi Kobayashi
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Patent number: D267965Type: GrantFiled: July 6, 1979Date of Patent: February 15, 1983Assignee: Maruman Golf Kabushiki KaishaInventor: Masashi Kobayashi
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Patent number: D277221Type: GrantFiled: April 6, 1982Date of Patent: January 15, 1985Assignee: Maruman Golf Kabushiki KaishaInventor: Masashi Kobayashi
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Patent number: D300547Type: GrantFiled: February 24, 1986Date of Patent: April 4, 1989Assignee: Maruman Golf Kabushiki KaishaInventor: Masashi Kobayashi
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Patent number: D344560Type: GrantFiled: September 24, 1991Date of Patent: February 22, 1994Assignee: Maruman Golf Kabushiki KaishaInventor: Yutaka Katayama