Vacuum spring tubular chest expander

The utility model discloses a vacuum spring tubular chest expander relates to a sports apparatus technical field, including the pull ring, pull rod, end cover, the O sealing washer that appears, spring pipe etc.. Characterized by: the end cover sets up at spring pipe both ends, and the pull rod is connected to the pull ring, and the end cover is connected to the pull rod, and the setting of O shape sealing washer is in the intraductal pull rod one end of spring. The utility model has the advantages that: intraductal outer atmosphere pressure is poor because the pulling force of this chest expander source mainly is the spring, the main cross -sectional area decision by the spring pipe of chest expander pulling force size, so the pulling force is very mild, the spring exerciser that can not look like to adopt at present is because of the fold increase of length elongation pulling force. 本实用新型公开了种真空弹簧管式拉力器，涉及种体育器械技术领域，包括拉环，拉杆，密封端盖，O形密封圈，弹簧管等。其特征是：密封端盖设置在弹簧管两端，拉环连接拉杆，拉杆连接密封端盖，O形密封圈设置在弹簧管内拉杆端。本实用新型的优点是：由于本拉力器的拉力来源