Abstract: A knife including a blade section having a sharp edge, a J-shaped section, and a handle section connected to the J-shaped section. The J-shaped section may have a bottom portion connected to a stem portion, and a substantially uniform thickness. The sharp edge may have a thickness which is substantially less than the substantially uniform thickness of the J-shaped section. The handle section may have a thickness which is substantially greater than the uniform thickness of the J-shaped section. The blade section, the J-shaped section, and the handle section may be configured so that a person can place an index finger of the person so that an end of the index finger contacts the bottom portion of the J-shaped section and a length of the index finger contacts the stem portion of the J-shaped section, while simultaneously one or more further fingers of the person grip the handle section.

Abstract: An apparatus including a housing, and a knife connected to the housing, wherein the knife at least partially folds into the housing. The apparatus also may include a first device for cracking a vehicle windshield, wherein the first device is connected to the housing. The apparatus may also include a second device for cutting a vehicle seat belt, wherein the second device is connected to the housing and at least partially folds into the housing. The knife may be connected to the housing so that the knife rotates in order to at least partially fold into the housing. The first device may include a first spring so that the first device can be compressed into the housing or expanded away from the housing. The second device may be connected to the housing so that the second device rotates in order to at least partially fold into the housing.

Abstract: A folding knife is disclosed including a blade, a handle device, and a magnetic piece. The blade may be connected to the handle device so that the blade can pivot with respect to the handle device. The magnetic piece may be fixed to the handle device so that the magnetic piece attracts and pulls the blade into a closed position or into an open position by a magnetic attraction between the blade and the magnetic piece. The magnetic piece may be a post fixed between left and right side plates.

Abstract: An apparatus for opening a folding knife is provided. The apparatus may include a plate having an arcuate slot and a substantially linear slot. A cam slide may be provided comprised of an extension which extends into the substantially linear slot, and an opening into which a post connected to a blade device can be inserted. The extension of the cam slide typically can be moved in a substantially linear manner in the substantially linear slot. The substantially linear movement of the extension in the substantially linear slot causes a sharp edge of the blade device to come out of or go into a housing.