Knives configured to use interchangeable blades, blades for those knives, and methods of making an using the knives and blades are disclosed. One knife includes a latch assembly that retains a blade in a slot of the latch assembly using a dual-stage locking mechanism wherein two different latches must be operated to exchange the blade in the slot. One latch is a button that translates a pin through the slot, and the other latch is a rocker lever that rotates into and out of contact with a notch, recess, or groove in the blade. The first latch controls movement of the second latch in order to help avoid inadvertent removal or dislodgement of the blade. Some blades include multiple notches or recesses so that they provide multiple points of contact that resist translation and rotation of the blade out of the slot, even when subjected to unusually-directed forces.

Knives configured to use interchangeable blades, blades for those knives, and methods of making an using the knives and blades are disclosed. One knife includes a latch assembly that retains a blade in a slot of the latch assembly using a dual-stage locking mechanism wherein two different latches must be operated to exchange the blade in the slot. One latch is a button that translates a pin through the slot, and the other latch is a rocker lever that rotates into and out of contact with a notch, recess, or groove in the blade. The first latch controls movement of the second latch in order to help avoid inadvertent removal or dislodgement of the blade. Some blades include multiple notches or recesses so that they provide multiple points of contact that resist translation and rotation of the blade out of the slot, even when subjected to unusually-directed forces.

The utility knife assembly includes a housing which extends in a longitudinal direction between opposite ends and presents an at least partially open interior. A blade with a sharp edge is fixed with the housing such that the blade extends through one of the longitudinal ends, and the blade is fixed with the housing in such a manner that it is non-movable relative to the housing. A blade protector is partially disposed in the open interior of the housing and is movable in the longitudinal direction relative to the housing between a retracted position and a covering position. In the retracted position, the sharp edge of the blade outside of the housing is exposed for cutting, and in the covering position, the sharp edge of the blade outside of the housing is covered by the blade protector.

The utility knife assembly includes a housing which extends in a longitudinal direction between opposite ends and presents an at least partially open interior. A blade with a sharp edge is fixed with the housing such that the blade extends through one of the longitudinal ends, and the blade is fixed with the housing in such a manner that it is non-movable relative to the housing. A blade protector is partially disposed in the open interior of the housing and is movable in the longitudinal direction relative to the housing between a retracted position and a covering position. In the retracted position, the sharp edge of the blade outside of the housing is exposed for cutting, and in the covering position, the sharp edge of the blade outside of the housing is covered by the blade protector.

A device is disclosed including a reloadable utility knife having a blade magazine with one or more compartments for storing multiple cutting blades. The blade magazine has a reloading compartment for new blades, and a storage compartment to keep additional blades. The blade magazine is loaded from the rear of the knife body and is locked inside. A working blade may be released before reloaded a fresh blade. The working blade can be extended or retracted multiple times via a blade transport mechanism. The blade magazine may be extracted via the lock mechanism and pushed out by a spring designed for this purpose. The blade transport mechanism, the blade release mechanism, and a blade lock mechanism work in cooperation to allow extension and retraction of a blade, disposing of a blade, and reloading of a blade.

A folding knife can include a handle portion, a pivot element, a blade, a locking element, a cap, and a rotatable wheel. The handle portion can comprise a first side portion and a second side portion. The blade can pivot about the pivot element between an open position and a closed position. The locking element can prevent disassembly of the first and second side portions when the locking element is in a locked position and allow disassembly of the first and second side portions when the locking element is in an unlocked position. The cap can be coupled to the first side portion adjacent the locking element. The pivot element can extend into the cap. The rotatable wheel can be disposed between the first and second side portions and can rotated to selectively retain the first and second side portions together.

Replaceable blade knives have an elongated body having opposed ends, a handle portion extending to a handle end of the elongated body, and a blade attachment facility at an opposed forward end of the elongated body, the blade attachment facility having a blade support surface configured to abut a major face portion of the planar blade proximate the elongated aperture, an elongated boss sized to closely receive the elongated aperture of the planar blade, the elongated boss defining an undercut configured to receive a blade portion at the constriction to prevent separation of the planar blade from the blade support surface when the planar blade is in an installed condition with the elongated boss received in the elongated aperture, and a movable ejector element connected to the elongated body and operable to engage the rear end of the planar blade to eject the planar blade from the holder.

Replaceable blade knives have an elongated body having opposed ends, a handle portion extending to a handle end of the elongated body, and a blade attachment facility at an opposed forward end of the elongated body, the blade attachment facility having a blade support surface configured to abut a major face portion of the planar blade proximate the elongated aperture, an elongated boss sized to closely receive the elongated aperture of the planar blade, the elongated boss defining an undercut configured to receive a blade portion at the constriction to prevent separation of the planar blade from the blade support surface when the planar blade is in an installed condition with the elongated boss received in the elongated aperture, and a movable ejector element connected to the elongated body and operable to engage the rear end of the planar blade to eject the planar blade from the holder.

A food slicer, which may be used for cutting a pizza with a single blade, and other food, such as pancakes, with multiple blades includes a housing configured to be gripped by a user in a first tilted orientation in which only the first rotating blade touches a work surface, and in a second level orientation, in which all three blades touch the work surface. A first rotating blade is mounted in the housing offset along a longitudinal axis from second and third rotating blades, whereby the tripod arrangement enables a steady structure during non-use, and whereby the second and third rotating blades may be lifted off of the working surface, while the first rotating blade cuts the pizza.

An electric utility knife having a blade which can facilitate manual precision cutting, at a singular consistent speed or varying speeds, without requiring the user to exert extreme or substantial manual pressure to cut through a material. The blade can be configured as a vibrating/oscillating/rotating blade to perform a majority of the cutting tasks. The user may simply guide the blade and exert minimal manual pressure on the knife. This can reduce the potential for injury and other repetitive motion stress injuries to a user. This can also facilitate greater cutting precision and can reduce cutting time.