JPS5920869Y2 - pocket knife - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a pocket knife that allows the blade to be inserted or removed while being held without placing a finger on the operating trajectory of the blade.

Conventionally, the device for folding the blade of a pocket knife and storing it in the handle has a back spring called a back spring that is held between the handle from both sides (as shown in the front view of Figure 1), and the tip of the back spring is cut into a core. It has a protrusion that fits into the cutout groove in the blade, and its middle part is pivoted to the handle, and the rear end is exposed in the notch provided at the rear of the handle. The blade was operated by pressing the rear end of the back spring exposed in the rear notch to release the protrusion at the tip from the notch groove in the core. When the tip of the back spring is in the open position and the retracted position, it is necessary to press the Okiko with a strong pressing force, so the back spring is made of steel and its strong elasticity is used, but the principle of leverage As is clear from the above, in order to pull up the tip of the back spring that is pivoted at the midpoint, it is necessary to apply a force to the rear end that exceeds the elasticity of the steel that is applied to the tip, but the thickness of the back spring is usually 2.3mm
Because of the thickness of the thumb, the force applied when pressing the rear end with the thumb is more than the elasticity of the dorsal spring, and the force is concentrated on the thumb, causing pain. As for the position of the fingers, the part to be operated is at the rear of the handle, so when the thumb is placed on the rear end of the dorsal spring, the other fingers are operated in an unstable grip state where the index and middle fingers can barely grasp the handle. In addition, since the above-mentioned pressure is applied to the thumb, there is a risk that the tip of the finger may slip and fall off the knife, causing injury to the leg, or the blade may be released from the pressure of the back spring and accidentally fall into the blade storage compartment. There were many cases where the fingers that were gripped were injured when the device was activated.

The present invention was devised for the purpose of eliminating the above-mentioned dangerous defects, and will be explained below with reference to the drawings.

FIG. 2 is an exploded view showing an embodiment of the present invention, and FIG. 3 is a sectional view of the main parts.

An L-shaped notch 13 is formed in the frame of the core 2 connected to the base end of the blade 1. The tip 4 of the back spring 5 to be engaged is also formed into an L-shape, and a notch groove 3 is formed in the core 2 below the L-shaped notch 13. The tip is set with the notch groove 3
A leaf spring 6, which is engaged with the blade and whose rear end is fixed to the rear of the handle, is installed inside the blade housing part 12, and a board 7 is fixed to the front part by fitting into the insertion hole 8 made in one of the handle parts 10. This pocket knife has a groove 9 carved into the inside of the other handle 11 into which the leaf spring 6 is fitted from the side.

Since the present invention has such a structure, the unreasonableness caused by the function of the back spring that presses the core of the conventional pocket knife and the function of engaging the blade when using and storing the blade can be painful. The more you do this, the more force you have to apply to your fingertips, forcing you to hold an unstable grip, which was the cause of No. 1's injury, but the present invention has a mechanism that hooks the blade to the back spring that causes this danger. When the tip of the leaf spring 6, which has a separate function of The tip of the leaf spring 6 comes out of the notch groove 3 of the core 2, and the blade 1 can be moved toward the blade storage part 12. This leaf spring 6 has its rear end fixed to the rear of the handle, and the distance between the fulcrum and the pressing point is far, so it can be activated by only lightly pressing the board 7, so there is no need to apply unreasonable force to the fingertips. There is no need to feel pain in the fingertips as in the past, and the grip of the handle can be operated by pressing lightly on the board 7 with only the thumb. Since a sufficiently stable grip can be achieved on the parts other than the sides, it is safe and will not injure your fingers even if the blade 1 accidentally activates and rotates into the blade storage part 12. , its practical value is extremely great.

Additionally, this device can be used for other types of knives that have foldable blades, such as craft knives, hunting knives, and snowman knives.

[Brief explanation of drawings]

FIG. 1 is a front view showing a conventional embodiment, FIG. 2 is an exploded view showing an embodiment of the present invention, and FIG. 3 is an enlarged sectional view of a main part of the embodiment of the present invention. 1: Blade, 2: Core, 3: Notch groove, 4: Tip, 5: Back spring, 6: Leaf spring, 7: Board, 8: Insertion hole, 9: Groove,
10: one handle, 11: other handle, 12: blade housing, 13: notch.

Claims (1)

[Scope of utility model registration request] An L-shaped notch 13 is formed in the frame of the core 2 connected to the base end of the blade 1. The tip 4 of the back spring 5 to be engaged is also formed into an L-shape, and a notch groove 3 is formed in the core 2 below the L-shaped notch 13. The tip is set with the notch groove 3
A plate spring 6, which is engaged with the handle and whose rear end is fixed to the rear of the handle, is installed inside the fillet storage part 12, and the board 7 is fixed to the front part in a state that it fits into the insertion hole JL8 bored in one of the handle parts 10. This pocket knife has a groove 9 carved into the inside of the other handle 11 into which a leaf spring 6 is fitted from the side.