Abstract: A cutter includes a blade, a handle, a holder, a pivot and a pin. The blade includes an aperture and a slit. The handle includes two lateral plates each of which includes an aperture and a recess. The holder includes a block formed between two lateral plates. The block is inserted in the slit when the blade is inserted in the holder. Each of the lateral plates of the holder includes a rear aperture and a front aperture. The pivot is selectively inserted in the apertures of the handle, the front apertures of the holder and the aperture of the blade to keep the holder in the handle. The pin is selectively inserted in the recesses of the handle and the rear apertures of the holder to keep the holder in a desired angle relative to the handle.

Abstract: A cutter includes a platform, two handles, a blade, a lever, two pawls, a helical spring and a torque spring. The platform is connected to the first handle. The lever includes a ratchet formed at a rear end and a block formed on a side. The blade includes a rear end formed with a slit for receiving the block. The first pawl is pivotally connected to the second handle. The torque spring includes an end in contact with the first pawl and another end in contact with the second handle for keeping a tip of the first pawl engaged with the ratchet of the lever. The second pawl and the handles are pivotally connected to one another. A helical spring includes an end connected to the second pawl and another end connected to the lever. The tips of the pawls are alternately engaged with the ratchet.

Abstract: A cutter includes two handles, a blade, a cutting board, an angle holder, two screws, a spring-biased lock and a releasing element. The cutting board is supported on the first handle. The blade is connected to the second handle. The angle holder includes teeth and a cutout. The angle holder is attached to the first handle by the screws. The releasing element is pivotally connected to the first handle and includes a slot. The spring-biased lock is pivotally connected to the first handle. The spring-biased lock is allowed to engage with the teeth or enter the cutout when an end of the slot is placed against one of the screws. The spring-biased lock is removed from the teeth and the cutout when another end of the slot is placed against the screw.