Cutting device
A cutting device includes a jaw with a first jaw member and a second jaw member, a first handle attached to the first jaw member and a second handle rotatably connected to the second jaw member at a second pivot point, a gear including a first set of teeth and a second set of teeth at a first end of the second handle. The second handle is slidably connected to the second jaw member at the second pivot point to allow the second handle and the second set of teeth to move into a disengaged position where the second set of teeth are located at a distance from the first set of teeth. To ensure that the teeth of the gear engage correctly, a slide lock is in an enabling state allowing the second handle and the second set of teeth to slide in a slide direction from the disengaged position to the engaged position only when the first set of teeth and the second set of teeth are aligned into a mutually predetermined position.
1. A cutting device, comprising:
a first jaw member and a second jaw member pivotally connected to each other by a first pivot point to mutually rotate in relation to each other around the first pivot point during a cutting stroke which moves the first and second jaw members towards each other,
a first handle attached to the first jaw member,
a second handle rotatably connected to the second jaw member by a second pivot point, and
a first set of teeth in the first jaw member and a second set of teeth in a first end of the second handle, the first set of teeth and the second set of teeth mating with each other in an engaged position to form a gear set and to move the first and second jaw members mutually towards each other during the cutting stroke,
wherein said second pivot point connects the second handle rotatably and slidably to the second jaw member to allow the second handle and the second set of teeth to move into a disengaged position where the second set of teeth are located at a distance from the first set of teeth where the first and second set of teeth are no longer mating,
a third protrusion is fixedly located on the second handle and a groove movably receiving the third protrusion is provided in the second jaw member, wherein the third protrusion and the groove cooperate to form a preventer that prevents rotation of the second handle in relation to the second jaw member while the second handle with the second set of teeth are in the disengaged position, and
the cutting device further comprises:
a first protrusion moving with the second handle during the cutting stroke and a contact area on the first handle that are selectively engageable to form a slide lock where
an enabling state occurs in response to non-contact between the first protrusion and the contact area and a disabling state occurs in response to contact between the first protrusion and the contact area, and
wherein the enabling state allows the second handle and the second set of teeth to slide from the disengaged position to the engaged position only when a user has aligned the first set of teeth and the second set of teeth into a mutually predetermined position, at which position said sliding may occur without contact between the protrusion and the contact area.
2. The cutting device according to claim 1 , wherein
the first protrusion moves with the second handle during the cutting stroke and protrudes in a slide direction from a first end of the second handle, and
the contact area on the first handle is curved around the first pivot point to contact the protrusion and change a state of the slide lock to the disabling state, when the first set of teeth and the second set of teeth are not aligned into the mutually predetermined position.
3. The cutting device according to claim 1 , wherein the first set of teeth and the second set of teeth are aligned into said mutually predetermined position at the end of the cutting stroke when the first and second handles are as close to each other as possible.
4. The cutting device according to claim 1 , wherein the second handle and the second jaw member are connected to each other by the second pivot point by a second protrusion at a fixed location in the second jaw member and an elongated opening movably receiving the second protrusion in the second handle.
5. The cutting device according to claim 1 , wherein the groove in the second jaw member which is curved around the second pivot point said groove is provided with a notch located at a larger distance from the second pivot point than other parts of the groove for receiving the third protrusion which is fixedly located to the second handle when the second handle with the second set of teeth is in the disengaged position.
6. The cutting device according to claim 1 , wherein the cutting device is a lopper.
7. The cutting device according to claim 1 , wherein the cutting device is a hedge shear.