Page 67 - Wire Rope News & Sling Technology - June 2019
P. 67

         second access aperture 134. The rope seat 162 may have a
         diameter 166 and the groove 130 may have a width 164 and
         a depth 168. In some examples, the diameter 166 of the rope
         seat is greater than the width of the groove 130. The diam-
         eter 166 of the rope seat 162 may be sufficient to receive
         rope diameters in the range of 0.25 in. to 6 in. The diameter
         may be chosen to be slightly larger than the diameter of the
         rope to be received within the rope seat 162. In illustrative
         implementations, the width 164 of the groove 130 may be in
         the general range of 2 to 3 times narrower than the diam-
         eter of the rope seat 162. The rope seat 162 may be centered
         within the thimble eye 110, i.e., the rope seat 162 may be
         bisected by a plane centered between the front face 136 and
         the rear face 138. The thickness of the thimble eye 110 may
         be chosen based upon the diameter of the rope seat in order
         to provide a depth 168 of the groove 130 may be such that
         the corresponding thickness of the front face 136 above the
         rope seat 162 on each side of the groove 130 is sufficiently
         strong to resist rated tension and load forces for the size of
         the thimble assembly 100.
         Cable gripper system
         Pat. 10,247,277  U.S.  class F16G 11/108 Int. class B25J
         Inventor: Rod Herrick, Whitefish, MT., Jared W. Shappell,   Figure 16: Exploded view of a timed gripper system, according  to
         Kalispell, MT.                                       another embodiment.
         Assignee: Roddie, Inc., Columbia Falls, MT.          together define an axial aperture or channel 30 dimensioned
           Disclosed is an integrated mechanical means for gripping   to receive a cable or wire rope. In a preferred embodiment,
         and releasing a cable or wire rope comprising opposing grip-  concave surfaces 32 are ribbed or cut or otherwise textured
         per members having a cable gripping surface and mechani-  to enhance the ability of concave surface 32 to “bite” into and
         cal means for timing the closing and opening of the grip-  hold to the metal surface when wedge 20 is pressed down
         per members about a cable surface such that each gripping   onto the wire rope or metal cable.
         member applies substantially the same pressure to the cable   The gripping devices of the present disclosure have a tim-
         or wire rope surface at substantially the same time.  ing means  for timing the opening  and closing  of concave
           Referring to figures 15, 16, and 17, two embodiments of a   surfaces 32 onto a cable surface such that surfaces 32 grip
         useful timed cable gripping mechanism and device in accor-  and hold the cable with substantially the same force. In the
         dance with the present disclosure are shown. In the figures,   figures  the  timing  mechanism  of  the  present  disclosure  is
         embodiments of a gripper mechanism 10 are illustrated in an   illustrated by mirror image gear segments 41 attached to
         exploded view. Gripper mechanism 10 comprises a plurality   a surface of opposing mirror image wedge pieces 20, posi-
         of gripper wedge pieces 20. Typically the gripper mechanism   tioned such that, when a wedge piece 20 is pivoted about a
         comprises a pair of opposing wedge pieces that are mirror   hinge point 22, gear teeth 50 on the two segments 41 engage
         images of one another, and other numbers of wedge pieces   with each other. Because gear segments 41 are substantial
         are envisioned to be useful. Wedge pieces 20 comprise an in-  mirror images on wedge pieces 20, the gear ratio between
         ner, concave surface 32 shaped and dimensioned to fit on the   segments 41 is 1:1. Thus, as one wedge piece is pivoted about
         surface of a metal cable or wire rope such that, when mirror   hinge point 22, engaged gear segments 41 translate the force
         image wedge pieces 20 come together, concave surfaces 32   of the pivot motion into substantially equal pressure applied
                                                              to the rope or cable surface from both wedge piece inner grip-
                                                              ping surfaces 32. It will be appreciated by those of ordinary
                                                              skill in the art that the number of gear teeth 50 on each gear
                                                              segment 41 can be any desired number, and the size and
                                                              shape of gear segments 41 can be varied as desired depend-
                                                              ing on the size of wedge pieces 20, the diameter of cable to be
                                                              gripped and the amount of gripping and/or pulling force to
                                                              be applied to the cable surface. Similarly, the choice of metal
                                                              composition for gear segments 41 and gear teeth 50 can be
                                                              made taking into account these standard variables.
                                                               Gear segment 41 can be integrally or removably attached
                                                              to a surface of wedge piece 20 by any standard means. In the
                                                              figures, bolts 70 pass through apertures 42 on the segment
                                                              and bolt into apertures 72 on wedge piece 20. Other means
                                                              of attachment are contemplated and are within the skill in
                                                              the art to apply.
                                                               In another embodiment,  wedge pieces  20 also can have
                                                              means for modulating or limiting their rotation relative to
                                                              one another. In one embodiment, means can be provided for
         Figure 15: Exploded view of a timed gripper system.                                   continued on next page

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