Tightening arrangement for packing rings of a packing box
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United States of America Patent
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-
Jun 26, 1990
Grant Date -
N/A
app pub date -
May 24, 1988
filing date -
Jun 2, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention relates to a sealing arrangement for sealing a rotary shaft by means of several adjacent ring-type packings arranged in a packing box. The disadvantage of known arrangements is that, in box-type sealings, only the packing rings disposed nearest to the clamping element are clamped effectively. In the arrangement of the invention, an intermediate gland (11) is arranged between packing rings (8, 9) and said intermediate gland is forced to move to the left while the screws (13) are being screwed up. The desired effect is achieved by providing the ends of each screw (13) with divergent threads (16, 17), which are provided with an unequal or equal pitch.
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