| 摘要 |
A swing training bat has a main body, a connecting tube, a handle, an extension spring, a fastening device, a striker and a securing device. The extension spring, the fastening device and the striker are mounted in the connecting tube. The extension spring is extendable and has two ends securely connected with the fastening device and the striker. The striker is capable of bumping the securing device when the swing training bat is swung. Because the extended extension spring generates a covering force capable of pulling back the striker and reducing a big bumping force between the striker and the securing device, to reduce the bumping force can relieve damage to a batter's hands. |
