Weed and Line Cutter Installation Tool

Abstract

The present invention relates to a novel apparatus and method for installing split line cutters on marine propeller shafts. The apparatus features a clamshell design comprising an upper and lower half, each with an inner cavity configured to accommodate a portion of the split line cutter. A hinge mechanism connects these halves, facilitating easy opening and closing around the propeller shaft. Key to this invention is a captive screw retaining mechanism within the clamshell, designed to hold screws in place even when unfastened, thereby simplifying the installation process and preventing loss of components. The apparatus includes a screwdriver opening aligned with a bolt cavity, allowing for engagement of captive screws. Additionally, the invention features temporary closure mechanisms, for secure handling during installation, and a retaining hole for attaching a line. This invention offers significant improvements in the installation of line cutters, emphasizing safety, efficiency, and ease of use.

1 . An installation tool for mounting a split line cutter onto a marine propeller shaft, the split line cutter having an upper portion, a lower portion, and at least one mounting bolt that secures the upper and lower portions around the propeller shaft, the installation tool comprising:
 (a) a first clamshell half configured to receive at least a portion of the split line cutter, the first clamshell half including a first inner cavity sized and shaped to protect a sharpened edge of the split line cutter;   (b) a second clamshell half hingedly coupled to the first clamshell half, the second clamshell half including a second inner cavity sized and shaped to protect another portion of the split line cutter;   (c) a retaining mechanism disposed on at least one of the first clamshell half or the second clamshell half, the retaining mechanism being configured to hold the split line cutter portions within the respective inner cavities when the installation tool is in a closed position;   (d) one or more bolt cavities formed in at least one of the clamshell halves, each bolt cavity being configured to hold the mounting bolt in a captive position, whereby a driver may engage the mounting bolt through a driver opening in the installation tool; and,   (e) a temporary closure mechanism that provides a temporary locking force that retains the installation tool in the closed position,   wherein the installation tool is adapted to (i) secure the split line cutter during alignment on the marine propeller shaft, (ii) protect the sharpened edge of the split line cutter, and (iii) allow a user to fasten the mounting bolt without directly contacting the sharpened edge.   
     
     
         2 . The installation tool of  claim 1 , wherein the temporary closure mechanism is a magnetic closure disposed on each of the first and second clamshell halves, the magnetic closure providing a temporary locking force that retains the installation tool in the closed position around the propeller shaft. 
     
     
         3 . The installation tool of  claim 1 , wherein the retaining mechanism comprises a removable plug that extends into a bolt hole of one of the split line cutter portions, and is automatically forced out of the bolt hole upon tightening of the mounting bolt. 
     
     
         4 . The installation tool of  claim 1 , wherein at least one of the first clamshell half or the second clamshell half includes a retaining hole adapted to receive a tether, lanyard, or other securing device, thereby preventing accidental loss of the installation tool in an underwater environment. 
     
     
         5 . The installation tool of  claim 1 , wherein the driver opening is shaped to guide a screwdriver or hex key into engagement with the mounting bolt without requiring direct visual alignment, providing tactile feedback to the user as the mounting bolt is tightened. 
     
     
         6 . The installation tool of  claim 1 , wherein at least one of the first clamshell half or the second clamshell half is formed from a polymeric material that is sufficiently rigid to protect the sharpened edge of the split line cutter and sufficiently low-cost to serve as both packaging and installation aid for the line cutter. 
     
     
         7 . The installation tool of  claim 1 , further comprising an optional safety strap configured to temporarily attach the tool to the propeller shaft, preventing the tool and enclosed line cutter portions from being dropped during installation. 
     
     
         8 . The installation tool of  claim 1 , further comprising the hinged connection being of sufficient rigidity to ensure alignment of the split line cutter. 
     
     
         9 . A method for installing a split line cutter onto a marine propeller shaft using an installation tool having first and second clamshell halves hingedly coupled, at least one retaining mechanism, and at least one bolt cavity for a mounting bolt, the method comprising the steps of:
 a. closing the clamshell halves around the propeller shaft, thereby aligning the split line cutter portions to clamp onto the shaft;   b. inserting a driver through at least one driver opening in the installation tool, the driver engaging the mounting bolt residing in the bolt cavity of the installation tool;   c. fastening the mounting bolt to secure the upper portion of the split line cutter to the lower portion on the propeller shaft; and   d. removing the installation tool by releasing the retaining mechanism after the mounting bolt is sufficiently tightened,   
       whereby the sharpened edge of the split line cutter is protected and the mounting bolts are retained against loss during installation. 
     
     
         10 . The method of  claim 9 , wherein a magnetic closure holds the clamshell halves together during step (c), further comprising the step of detaching the magnetic closure by manually applying force to separate the first and second clamshell halves. 
     
     
         11 . The method of  claim 8 , further comprising the step of attaching a tether or lanyard to the installation tool prior to submerging the tool, such that the tool and the split line cutter portions remain secured to the vessel in an underwater environment. 
     
     
         12 . The method of  claim 8 , wherein the mounting bolt includes a pre-applied locking material retained in place by the bolt cavity, the method further comprising activating the locking material during step (e) to prevent the mounting bolt from loosening under vibration. 
     
     
         13 . A kit for installing a split line cutter onto a marine propeller shaft, comprising:
 (a) a split line cutter including an upper portion, a lower portion, and at least one mounting bolt configured to secure the upper and lower portions around the propeller shaft;   (b) an installation tool according to  claim 1 , wherein the installation tool is sized to house and protect the split line cutter portions during storage and shipping; and   (c) instructions describing a procedure for placing the split line cutter portions into the installation tool, aligning the tool on the propeller shaft, and tightening the mounting bolt using the installation tool, wherein the installation tool and the split line cutter are packaged and sold together for convenient, safe, and accurate installation.