| 摘要 |
<p>A cartridge assembly is disclosed. The cartridge assembly includes a core, a cartridge housing defining a cavity that receives the core, a shaft extending from the cartridge housing into the cavity and at least part way into the core, and a torsion spring. The torsion spring is helically wound to define a coiled outer surface that is received in the core and also includes at least one end that engages the shaft. When the core is rotated in a first direction about the shaft, a circumference of the coiled outer surface of the torsion spring increases thereby restricting a rotation of the core in the first direction. When the core is rotated in a second direction opposite the first direction, the coiled outer surface provides a controlled amount of drag to resist a rotation of the core in the second direction.</p> |
