Cassette type stapler

A cassette type stapler comprising, in combination:

• (a) a base (10),
• (b) a cassette holding member (14) pivotally mounted on said base and with said member having an elongate longitudinally extending hollow portion (24) defined by a plurality of generally planar side walls,
• (c) a cassette member (26) disposed within said hollow portion of said cassette holding member, and with said cassette member having a plurality of generally planar side walls,
• (d) longitudinally extending cooperative locating guide means (38, 36) on said members (14, 26) for guiding said cassette member in a desired orientation within said hollow portion of said cassette holding member,
• (e) a locking device (42) mounted to said cassette holding member,
• (f) means (38A) on said cassette member for cooperative locking engagement with said locking device to thereby releasably hold said cassette member when the latter is fully inserted into said hollow portion of said cassette holding member,
• (g) and longitudinally extending rib means (46) disposed on all of said side walls of one of said members and with said rib means engaging all of said side walls of the other of said members to essentially prevent play between said members throughout their length with a minimum of friction therebetween when said cassette member is inserted into said hollow portion of said cassette holding member.