Disposable utility knife with safety lock
AssigneeEdge Technologies Engineering LLC
InventorScott Sullivan
Life of this patent
Estimating the term…
Abstract
A utility knife includes a hollow handle having a slot and an opening at each end. A razor is slidable between each end of the handle and may protrude at each opposing end for cutting use. The razor is mounted to a shuttle which includes a tab that is positioned within the slot. The user may use the tab to slide the shuttle and the blade within the handle between the two ends, as desired. A U-shaped blocking component is pivotally attached to the handle and is used to block sliding movement of the tab beyond a midpoint of the handle to prevent the razor protruding into the user's hand. The user must unlock the blocking element to safely allow the shuttle to be slid past.
Claims19
A portable utility knife comprising:
- a hollow elongated handle including opposing first and second ends, and defining a slot surface therebetween, said hollow handle defining a cavity therein and having a midpoint located equidistant from said first end and said second end;
- an elongated slot within said slot surface, said elongated slot providing access through said handle to said cavity;
- a first opening located at said first end and a second opening located at said second end, said first and second openings extending through said handle to said cavity;
- a blade shuttle positioned within said cavity and selectively slidable between said first end and said second end;
- a razor blade secured to said shuttle, so that when said shuttle is adjacent said first end, said razor blade extends through said first opening of said handle, and when said shuttle is positioned adjacent said second end, said razor blade extends through said second opening;
- a tab attached to said blade shuttle, said tab extending through said elongated slot so that a portion of said tab is accessible to a user, said tab being used to selectively slide said shuttle within said cavity between said first and second ends;
- and
- a movable blocking component attached to said handle substantially at said midpoint, said blocking component being selectively moveable between a first position, wherein said tab is blocked from sliding past blocking component and a second position, wherein said tab is permitted to slide past said blocking component.
A safety knife for use by a user, said knife comprising:
- an elongated handle having opposing first and second ends;
- a blade assembly slidably attached to said handle, said blade assembly being selectively slidable between said first and second ends, said blade assembly including a cutting edge that is exposed when said blade assembly is located adjacent one of said first and second ends;
- a tab projecting from said elongated handle and being connected to said blade assembly so that sliding movement of said tab causes sliding movement of said blade assembly, said tab being slidable along a path;
- and
- an obstructive component moveably attached to said handle, adjacent said path, said obstructive component being moveable between an obstructive position, wherein said obstructive component becomes positioned directly across said path of said tab, thereby preventing said tab from sliding along said path, past said obstructive component and a non obstructive position, wherein sliding passage of said tab past said obstructive component is permitted.
A safety knife for use by a user, said knife comprising:
- an elongated handle having opposing first and second ends;
- a blade assembly slidably attached to said handle, said blade assembly being selectively slidable between said first and second ends, said blade assembly including a cutting edge that is exposed when said blade assembly is located adjacent one of said first and second ends;
- an access tab attached to said blade assembly and slidable along a path;
- and
- a U-shaped blocking component pivotally attached to said handle between a blocking position, wherein said path is blocked and said access tab is physically prevented from sliding along said path past said blocking component and thereby preventing said blade assembly from reaching one of said first and second ends, and a non-blocking position, wherein said tab is permitted to slide past said blocking component.
Dependencies are inferred from the claim text.