| 摘要 |
<p>A tamper resistant fitting for a container, particularly but not essentially a beverage container, comprises a plastics insert (10) which is located coaxially around a part (9) forming a closure in the outlet (21) in the side wall (20) of a container. The insert has a top flanged portion (15) which in use lies beneath the top plate (1) of the closure with three equi-radially spaced lugs (13) projecting from the top plate and provided for engagement with a tool through which rotational torque can be applied so as to engage the screw threading (12) on the insert with a complementary screw threading (25) on the outlet housing (21). When the closure is fully tightened into the housing the lugs (13) are broken off, this then leaving only frictional engagement between the outer peripheral surface of the closure (9) and the inner peripheral surface of the insert (10). The frictional coefficient between the two surfaces is arranged so that rotation will not occur with normal forces occurring in use, for example if a liquid extracting coupling device is connected with the top plate (1), but the parts will rotate at an applied value of rotational force which is less than that necessary to unscrew the insert (10) from the housing (21). In a further feature a thin plastics cap (25) is provided which incorporates fingers (29) which deform during engagement with the housing (21) so that they lie beneath a protuberance (24). When the closure is removed the fingers are deformed downwardly and break off from the cap thereby providing evidence of tampering.</p> |
