Gravity-opened Patents (Class 30/163)
  • Patent number: 10800051
    Abstract: A utility knife includes a housing with multiple interior spaces, each for holding a utility blade slidably therein. A U-shaped spring-clip has two ends rotationally fixed with the housing. A catch section of the spring clip traverses a retention slot formed in the housing. The spring clip may be pushed from an inward position into an outward position to allow the utility blade to pass from the interior space out through a slot to exit an end of the housing. When the spring clip is released with a retaining notch of the utility blade aligned with the retention slot, the retaining clip engages the retaining notch to capture the utility blade in a deployed position. Preferably the housing comprises several thin metal plates stacked together and fastened with a plurality of mechanical fasteners.
    Type: Grant
    Filed: April 1, 2019
    Date of Patent: October 13, 2020
    Inventors: John Ronan, Wayne Biggs
  • Patent number: 8468702
    Abstract: A knife has a pair of housing parts relatively shiftable between an open position and a closed position and a base on one of the housing parts forming a blade seat. A holding arm mounted on the base is movable relative thereto between a blade-holding position retaining a blade in the seat and a blade-change position freeing the blade so that in the blade-change position the blade can be switched. Interengaging formations on the other housing part and on the arm shift the holding arm from the blade-holding position into the blade-change position on movement of the housing parts from the closed position into the open position.
    Type: Grant
    Filed: June 2, 2010
    Date of Patent: June 25, 2013
    Assignee: Martor KG
    Inventor: Wolfgang Doeren
  • Patent number: 7562455
    Abstract: An out-the-front automatic knife incorporates dual locking and release mechanisms that define a three-point blade-handle interconnection between the blade and the handle when the blade is locked in the open position. A single trigger is operable to automatically open the knife, and to automatically close the knife. Separate firing and retraction springs may be provided with different spring strength to vary the speed and strength of the blade moving to the open position, and to the closed position. Blade guide systems cause the blade to travel longitudinally and linearly. The handle substantially encloses the blade and incorporates an access port to facilitate cleaning and maintenance of components housed in the handle interior.
    Type: Grant
    Filed: December 5, 2007
    Date of Patent: July 21, 2009
    Assignee: Mentor Group, L.L.C.
    Inventors: William McHenry, Steven Ingram
  • Patent number: 7389587
    Abstract: A utility knife which includes a feature for presenting a user with a replacement blade holder containing replacement blades when the separate halves of the knife body, referred to as handle portions, are opened to expose an interior cavity is disc losed. A pivotable latching lever selectively movable between a latched position and an unlatched position permits the two handle portions to pivot relative to one another about a pivot axis when the lever is in the unlatched position so that the replacement blade holder may be presented to the user. The disclosed utility knife having a replacement blade holder and a latching lever is capable of very economic manufacture, yet is dependable in operation.
    Type: Grant
    Filed: September 8, 2005
    Date of Patent: June 24, 2008
    Assignee: Helen of Troy Limited
    Inventors: Anthony Di Bitonto, Mark Prommel, Goeran Jerstroem, Conor McNamara
  • Patent number: 7305769
    Abstract: An out-the-front automatic knife incorporates dual locking and release mechanisms that define a three-point blade-handle interconnection between the blade and the handle when the blade is locked in the open position. A single trigger is operable to automatically open the knife, and to automatically close the knife. Separate firing and retraction springs may be provided with different spring strength to vary the speed and strength of the blade moving to the open position, and to the closed position. Blade guide systems cause the blade to travel longitudinally and linearly. The handle substantially encloses the blade and incorporates an access port to facilitate cleaning and maintenance of components housed in the handle interior.
    Type: Grant
    Filed: January 27, 2006
    Date of Patent: December 11, 2007
    Assignee: Mentor Group, LLC
    Inventors: William McHenry, Steven Ingram
  • Patent number: 5571214
    Abstract: A human forearm prosthesis is disclosed which has attached thereto a device comprising a housing, a knife blade suitable for cutting food, a projection on the knife blade for restraining the travel of the knife blade into the housing when it is desired to retract the knife blade into the housing for storage thereof, and out of the housing when it is desired to extend the knife blade for use of the knife blade for cutting food. Preferably, the knife blade moves into and out of the housing by force of gravity. The travel of the knife blade is restrained by a guide slot which extends substantially the length of the housing and a projection located on or near the back end of the knife blade, which projection travels in the guide slot. The device of the invention has a spring operated knife blade release mechanism that blocks the knife blade from passing out of the housing when it is desired to restrain the blade in retracted position.
    Type: Grant
    Filed: July 12, 1995
    Date of Patent: November 5, 1996
    Inventor: Edward Niziol
  • Patent number: 5404646
    Abstract: A lever locking knife with reversing blade having a handle with a slotted recess therein for removably receiving the blade, the handle having a lever pivoted from it, now the blade having a notch that receives a portion of the lever when the lever is in the closed position to hold the blade either in the extended, usable position, or received within the handle recess.
    Type: Grant
    Filed: December 6, 1993
    Date of Patent: April 11, 1995
    Inventor: Woodrow W. Naifeh
  • Patent number: 5371948
    Abstract: A self-locking knife which has a guide at the heel of the blade integral with the heel of the knife or attached therewith which blade is mounted in a pair of bolsters superposed on each other, forming a casing for the knife and defining a space or slideway therebetween for passage of the blade from a retracted to an extended position where the blade is projected forwardly of the casing and providing interlock between the blade and the casing, maintaining the blade in either position.
    Type: Grant
    Filed: December 16, 1993
    Date of Patent: December 13, 1994
    Assignee: Timothy K. Liffiton
    Inventor: Timothy K. Liffiton
  • Patent number: 5203085
    Abstract: A safety utility knife has a weighted pawl which, upon a slip of the knife, disengages from a blade holder to allow the latter to be retracted by a spring. The tooth of the blade holder engages the blocking surface of the pawl with only line or point contact and the blocking surface itself is tangential to a circle centered on the pawl pivot axis. The pawl spring is a coil spring extending in the direction of displacement of the blade holder and generally corresponds to the retraction spring.
    Type: Grant
    Filed: April 30, 1992
    Date of Patent: April 20, 1993
    Assignee: Martor-Argentax E.H. Beermann KG
    Inventor: Marald Berns
  • Patent number: 4926555
    Abstract: The present disclosure describes a pocket knife. The pocket knife comprises a pair of bolster linings superposedly fixed to each other and defining a space therebetween, a cutting blade slidably mounted in the space relative to one of the linings and adjacent thereto, a leaf spring fixed to the other lining in the space, one end of the leaf spring adapted to abut against the end of the blade when the latter is projecting partly out of the linings, a knob connected to the end of the blade and extending out of a slot provided through the first lining, the knob being pivotingly connected to the end of the blade and adapted to push on the leaf spring and retract the latter from abutment with the end of the blade.
    Type: Grant
    Filed: August 16, 1989
    Date of Patent: May 22, 1990
    Assignee: Wenger SA
    Inventor: Denis J. Lemaire
  • Patent number: 4858320
    Abstract: A wedge-shaped arrangement for retracting a leaf spring is positioned in abutment against the tang of a cutting knife. The retraction of the leaf spring is produced by a sliding rod which engages the wedge and pulls on the leaf spring.
    Type: Grant
    Filed: April 4, 1988
    Date of Patent: August 22, 1989
    Inventor: Denis J. Lemaire