| 摘要 |
An exercise harness has a band (1) that is retained partially encircling the user's head, by a chin-strap (3) and inter-connected head-straps (4). The straps (3, 4) are attached to individual spaced locations of the band (1) by press-studs (6, 7) or two-part fabric fastenings. A cord (13) extending through a pulley-block (14) is clipped at its ends (12) to rings (11) at respective ends of the band (1). Load from a weight or from reaction to head movement is applied to the pulley-block (14) via a swivel connection (15) for equalisation and balancing out of asymmetrical tensioning of the two ends of the band (1) for extension exercise of muscles of the spinal cervix. Unsafe or inappropriate loading causes break-out of one or more of the press-studs (6, 7) or other fastenings to give audible warning of it and a measure of relief. |
