Spring shielded safety knife
OwnerWilliam A. Kloostermaninventor
Life of this patent
Estimating the term…
Abstract
A safe knife is provided by utilizing a spring operated blade guard which automatically covers the blade of the knife at such times when the knife is not in use. The blade guard includes a knife guide plate which serves to correctly position the knife blade for a cutting operation, and the blade guard is retractable into an outer shell or handle of the knife against the compression force of a spring when a cutting operation is undertaken by a user, so as to expose only so much of the blade as required to efficiently perform the cutting operation.
Claims6
A spring shielded safety knife, said knife including handle means for permitting a user to operably grip said knife, said handle means having a hollow interior portion, blade cutting means fixedly secured to said handle means and extending outwardly therefrom, blade shield means normally positionable over said blade cutting means and being slidably retractable into said hollow interior portion of said handle means, spring means contained in said hollow interior portion biasing said blade shield means into blade shielding position, said blade shield means being retained in position over said blade cutting means by a compression force provided by said spring means, said blade cutting means being detachably securable to a longitudinally extending blade shaft, said blade shaft being in concentric alignment with said hollow interior portion of said handle means and being fixedly secured to a remote end of said handle means, said blade shaft having a travel slide means operably associated therewith, said travel slide means serving to regulate a depth of cut of said blade cutting means by limiting a movement of said blade shield means into said hollow interior portion of said handle means, said travel slide means including a travel slide operably positionable in a slot on said blade shaft and further including a screw means threadably securable thereto, said screw means passing through said slot means in said blade shaft and being securable to an aperture contained on said blade shield means.
A spring shielded safety knife, said knife comprising:
- handle means for permitting a user to operably grip said knife, said handle means having a hollow interior portion;
- blade shaft means concentrically positionable within said hollow interior portion of said handle means and being fixedly secured to a remote end of said handle means;
- blade means fixedly securable to an end of said blade shaft means extending outwardly from said handle means;
- inner slide means normally positionable over said blade means so as to prevent a cutting injury to a user of said knife, said inner slide means being retractable into said hollow interior portion of said handle means against a compression force provided by a spring means operably positioned in said hollow interior portion, said spring means serving to hold said inner slide means over said blade means when said knife is not being used by a user;
- travel slide means operably associated with said blade shaft means and said inner slide means, said travel slide means including a travel slide positionable in a slot formed through said blade shaft means, said travel slide means further including a screw insertable through one of a plurality of apertures extending through said inner slide means, said screw being threadedably securable to said travel slide, said travel slide means serving to regulate a depth of cut provided by said knife by limiting a movement of said inner slide means into said hollow interior portion of said handle means, thereby limiting the extent that said blade means extends outwardly from said inner slide means;
- and
- knife guide plate means fixedly secured to an end of said inner slide means from which said blade means extends during an operation of said knife by a user, said knife guide plate means being directly abuttable against a material to be cut and serving to facilitate a cutting of such material by said user.
A spring shielded safety knife, said knife including handle means for permitting a user to operably grip said knife, said handle means having a hollow interior portion, blade cutting means fixedly secured to said handle means and extending outwardly therefrom, blade shield means normally positionable over said blade cutting means and being slidably retractable into said hollow interior portion of said handle means, spring means contained in said hollow interior portion biasing said blade shield means into blade shielding position, said blade cutting means being detachably securable to a longitudinally extending blade shaft, said blade shaft being in concentric alignment with said hollow interior portion of said handle means and being fixedly secured to a remote end of said handle means, said blade shaft having a travel slide means operably associated therewith, said travel slide means serving to regulate a depth of cut of said blade cutting means by limiting movement of said blade shield means into said hollow interior portion of said handle means, said travel slide means including a travel slide operably positionable in a slot on said blade shaft and further including a screw means threadably securable thereto, said screw means passing through said slot means in said blade shaft and being securable to an aperture contained on said blade shield means.
Dependencies are inferred from the claim text.