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    • 81. 发明专利
    • TENSION CLAMP AND SCREENING APPARATUS
    • CA2346025A1
    • 2000-04-13
    • CA2346025
    • 1999-02-18
    • TUBOSCOPE I P INC
    • SEYFFERT KENNETH WAYNE
    • B07B1/48B07B1/56
    • A clamp (10) is provided for releasably securing a screen (93) to a basket sidewall of a vibratory screening apparatus. A body of the clamp has a front plate (20) for abutment with plate (18) of the vibratory screening apparatus . A first link (30) is pivoted at (22) to the front plate (20) and has a first contact surface. A second link (40) is pivoted at (32) to the first link and has a second contact surface. A swivel is pivoted at (42) to the second link . A bolt (60) is formed with a head (61) that projects beyond the front plate (20) and a tail that projects beyond the swivel (50). The bolt is tightenabl e in place by an adjusting nut (66) threaded onto the tail end thereof which i n an expanded locking state of the clamp can compress spring washers (64) between itself and the swivel (50). The links (30, 40) can be moved from the ir release state (Fig. 2B) to their locking state (Fig. 1B) with the pivot (32) between the links preferably travelling through an "overcentre" position. Adjustment of the nut (66) with the links in the locking position permits th e tension applied to the screen (93) to be adjusted after the screen has been clamped into place. Vibratory screen apparatus in which the above clamps can be used is also described.