JPS6440071A - Racket - Google Patents
RacketInfo
- Publication number
- JPS6440071A JPS6440071A JP62198492A JP19849287A JPS6440071A JP S6440071 A JPS6440071 A JP S6440071A JP 62198492 A JP62198492 A JP 62198492A JP 19849287 A JP19849287 A JP 19849287A JP S6440071 A JPS6440071 A JP S6440071A
- Authority
- JP
- Japan
- Prior art keywords
- balancer
- spring
- racket
- position near
- hitting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Manipulator (AREA)
Abstract
PURPOSE: To compromise between the swinging easiness and the ball hitting speed by providing a racket frame with a balancer which can freely move between a position near the grip and a position near the racket, and urging means for urging the balancer toward the position near the grip. CONSTITUTION: A balancer 4 and a spring 4 as an urging means are accommodated in a cylinder 5 attached to a frame 1, and in a normal condition, since the balancer 3 is located at a position near a grip G by the urging force of the spring 4, a large force is not required at a start of swinging. Further, the urging force of the spring 4 is set to be greater than the weight of the balancer 3, and upon hitting, the spring expands since a centrifugal force greater than the urging force of the spring 4 is applied in a direction in which the head H of the racket is advanced. Thus, the balancer 3 is moved toward the head H so that the gravitational center of the racket appoaches the head H, and accordingly, the ball hitting speed can be enhanced. Thus, it is possible to reduce the inertial moment at a start of swinging, and to increase the inertial moment at the instant of hitting of a ball, thereby it is possible to compromise between the hitting easiness and the ball hitting speed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62198492A JPS6440071A (en) | 1987-08-07 | 1987-08-07 | Racket |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62198492A JPS6440071A (en) | 1987-08-07 | 1987-08-07 | Racket |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6440071A true JPS6440071A (en) | 1989-02-10 |
Family
ID=16392021
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62198492A Pending JPS6440071A (en) | 1987-08-07 | 1987-08-07 | Racket |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6440071A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2382782A (en) * | 2001-12-07 | 2003-06-11 | Yang Jian Kuo | Changing centre of gravity of object, eg sports racket, bat or club |
| US6623383B2 (en) | 2001-02-20 | 2003-09-23 | Bridgestone Sports Co., Ltd. | Racquet with slidable weight |
| US7821511B2 (en) | 2003-05-20 | 2010-10-26 | Sony Corporation | Power supply voltage converting circuit, method for controlling the same, display device, and mobile terminal |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6085771A (en) * | 1983-10-17 | 1985-05-15 | 宮沢 恵人 | Gravity moving ball hitting athletic device |
-
1987
- 1987-08-07 JP JP62198492A patent/JPS6440071A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6085771A (en) * | 1983-10-17 | 1985-05-15 | 宮沢 恵人 | Gravity moving ball hitting athletic device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6623383B2 (en) | 2001-02-20 | 2003-09-23 | Bridgestone Sports Co., Ltd. | Racquet with slidable weight |
| GB2382782A (en) * | 2001-12-07 | 2003-06-11 | Yang Jian Kuo | Changing centre of gravity of object, eg sports racket, bat or club |
| US7821511B2 (en) | 2003-05-20 | 2010-10-26 | Sony Corporation | Power supply voltage converting circuit, method for controlling the same, display device, and mobile terminal |
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