초록 ▼

A cage assembly for small laboratory animals includes a cage having an open-top transparent body and optionally a containment member within the cage body to confine the animals. A filter cap for biologically isolating the encaged animals from the surrounding environment is disposed on the cage. The

A cage assembly for small laboratory animals includes a cage having an open-top transparent body and optionally a containment member within the cage body to confine the animals. A filter cap for biologically isolating the encaged animals from the surrounding environment is disposed on the cage. The filter cap has a rigid transparent housing which rests upon and encompasses the cage. The marginal portion of the filter cap overhangs the marginal portion of the cage to prevent the filter cap from being dislodged from the cage. The filter cap has a perforated top wall against the under surface of which an air filter is detachably secured by retainer member which snaps into mounted position in which the filter is sandwiched between the perforated top wall and the retainer member, with the top wall protecting the filter against damage during handling of the filter cap.

대표청구항 ▼

A filter cap for an open-top animal cage, comprising: a rigid body portion sized to fit upon and cover over the open top of said cage, said body portion having continuous, unbroken side and end walls, a perforated top wall and an open bottom end, detachable air filter means extending across the enti

A filter cap for an open-top animal cage, comprising: a rigid body portion sized to fit upon and cover over the open top of said cage, said body portion having continuous, unbroken side and end walls, a perforated top wall and an open bottom end, detachable air filter means extending across the entire perforated top wall of said filter cap body portion, flange means extending around the periphery of the open bottom end of said body portion and including a lateral flange portion sized and positioned to rest upon the top surface of said animal cage when the filter cap is inserted thereon, to effect a substantial peripheral seal between said filter cap and said cage, and a continuous rigid skirt portion depending from said lateral flange portion and sized to closely encompass the open top of said cage such that said filter cap overhangs said cage and cannot be dislodged therefrom, said air filter means comprising a sheet of filter material sized to fit closely within the upper end of said body portion against said perforated top wall, support means comprising a support member sized to fit closely within said filter cap and insertible through said open bottom end of said filter cap to a filter-retaining position in which it is flush against the under surface of said sheet of filter material with said sheet in a mounted position in which it is sandwiched between said support means and the perforated top wall and covers over the perforations of said top wall, and retaining means on the inner surfaces of at least some of said filter cap side and end walls for detachably securing said support member in said filter-retaining position, said retaining means being sized and positioned to engage the periphery of said support member with a snap fit when said support member is brought to its filter-retaining position.