JPS6344393B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Objective) The present invention relates to improvements in cutlery such as knives, saws, knives, and sickles, and particularly to improvements in the connection structure between the blade and handle.

In today's world where cutlery products tend to become more sophisticated and expensive, there is great social demand for cutlery with replaceable blades. When the blade and handle are made removable, it is necessary to ensure that they are firmly attached and easy to attach and detach. This invention seeks to meet the above requirements.

(Structure) An embodiment of the present invention will be described with reference to FIGS. 1 to 3. The embodiment relates to a knife. The knife consists of a handle 1 and a blade 2, and the blade 2 consists of a blade part 3 and a core 4. The core 4 of the blade 2 is the hilt 1
By being inserted from the front end of the blade 2, the blade 2 is removably attached to the handle 1. The attachment/detachment structure will be explained below.

A core 4, which is slightly shorter than the length of the handle 1, is formed at the rear part of the blade part 3, and a rectangular hole 5 is bored slightly behind the center of the core 4. In another embodiment, the hole 5 may be circular. A cap 7 having an insertion opening 6 for a core 4 is attached to the front end of the handle 1. The shape of the insertion opening 6 is the same as the shape of the longitudinal section of the core 4. When the size of the blade 2 attached to the handle 1 changes (therefore, the size of the core 4 also changes), it is possible to change to a cap 7 having an insertion opening 6 that matches the size of the core 4. can. Projections 8 are formed on both sides of the insertion port 6 at the rear end of the cap 7, and a projection 9 is integrally provided on the outside of the projection 8. On the other hand, a recess 10 is bored at the tip of the handle 1. The cap 7 is removably attached to the handle 1 by fitting the protrusion 9 of the cap 7 into the recess 10 of the handle 1.

The inside of the handle 1 is hollow, and there is a member for locking the core 4 in the hollow. A front plate spring 11 is attached to one side of the inside of the handle 1 for pressing the inserted core 4 to the opposite side. A curved portion 12 is formed at the free end portion of the front leaf spring 11. The front leaf spring 11 is such that its base 13 is joined to the front of the inner surface of the handle 1, its tip faces toward the rear of the handle 1, and the curved part 12 is located on the opposite side beyond the center inside the handle 1. installed. The width of the front leaf spring 11 in the figure is narrower than the width of the core 4. This front plate spring 11 is attached to the core 4 when the core 4 is inserted.
It also serves as a guide.

A locking protrusion 14 is provided in the center of the interior of the handle 1, integrally with a middle plate spring 15, for fitting into the hole 5 of the core 4 and fixing the blade 2 when the core 4 is inserted. It is being The middle leaf spring 15 is thicker and longer than the front leaf spring 11, and has a width wider than the width of the core 4.
The base 16 of the middle plate spring 15 is attached to the inner side of the handle 1 on the side opposite to the side to which the front plate spring 11 is attached. A central portion 17 of the middle leaf spring 15 is formed to be inclined toward the inside of the handle 1. Near the free end of the middle leaf spring 15,
A locking protrusion 14 that fits into the hole 5 of the core 4 when the core 4 is inserted is formed to have a trapezoidal cross section. In its natural state, the locking protrusion 14 exceeds the center of the interior of the handle 1, but when the core 4 is inserted into the insertion slot, it fits into the hole 5 of the core 4 and is connected to the core 4. Make a straight line and position it in the center of handle 1. The side surface of the locking protrusion 14 on the base 16 side is sloped so that when the core 4 is inserted, the core 4 is smoothly inserted without being caught on the tip thereof. The distal end side of the locking protrusion 14 is perpendicular to the core 4 so that when the locking protrusion 14 is fitted into the hole 5 of the core 4, the fitting will not come off even if the core 4 is pulled. is formed.

Inside the handle 1, a locking protrusion 14 that faces the middle plate spring 15 and fits into the hole 5 of the core 4 is inserted into the hole 5.
A push button 18 is provided for removing the cover. The push button 18 has an operating section 19 provided with a stepped portion 23 and an operating section 1.
2 protruding downward from the lower side of 9 and on both sides
It consists of two leg parts 20. The length of the leg 20 is the handle 1
The distance between both legs 20 is longer than the width of the core 4. That is, when the push button 20 is attached, the legs 20 straddle the core 4, and the lower ends of the legs 20 are in contact with both front sides 21 of the middle plate spring 15. A window 22 is bored in the side of the handle 1 for operating the operating section 19 of the push button 18 from the outside. This window 22 has a push button 18 inside the handle 1.
The stepped portion 23 of the operating portion 19 is
An inwardly facing step 24 is provided around the periphery of the window 22 to engage with the window 22 .

On the same side as the middle plate spring 15 inside the handle 1, there is a rear plate spring that comes into contact with the end of the core 4 and automatically pushes out the core 4 when the push button 18 is pressed to remove the core 4. 25 is installed. This rear leaf spring 25
is in a position where it does not get in the way when the middle plate spring 15 is pushed back. Furthermore, a stopper 26 is provided behind the rear plate spring 25 to prevent the inserted core 4 from being pushed in unnecessarily. The stopper 26 is formed in an L-shape, with one side fixed to the inner side of the handle 1 and the other side perpendicular to the handle 1.

(Effects of the Invention) Since the present invention has the above configuration, the locking portion is deformed in advance against elasticity, and after inserting the core of the blade into the handle, the user can remove the hand from the locking portion. Just by releasing the locking part, the locking part returns to its original position due to its elasticity and engages with the hole 5 of the core, and the blade is fixed to the handle, so the core can be easily attached to the handle. be.

Further, since the locking portion and the hole in the core can be disengaged by simply pressing the operating portion exposed on the outside of the handle, the core can be easily removed from the handle. In this case, the operating part is only visible on the outside of the handle and does not protrude from the surface of the handle, so the locking part cannot be released just by grasping the handle, so it can be handled safely. There is.

(Effects of Example) Since the middle plate spring integrated with the locking protrusion is inclined toward the rear of the handle, when attaching the core to the handle,
As the core is pushed into the handle, the locking protrusion moves perpendicularly to the surface of the core, and when the hole in the core and the locking protrusion are aligned, the locking protrusion closes. The part fits into the hole in the core.

Further, since the rear leaf spring always presses the rear end of the core, the core protrudes slightly from the handle when the push button is pressed to remove the locking protrusion from the hole in the core, making it easy to pull out.

[Brief explanation of the drawing]

Fig. 1... Partial cross-sectional view of the knife of this invention, Fig. 2
Figure: Partial front view of the knife; Figure 3: Partially cutaway front view of the knife. 1...handle, 2...blade, 4...core, 5...hole, 7...
Base, 11... Front plate spring, 14... Locking protrusion, 15...
Middle plate spring, 18...push button.

Claims (1)

[Claims] 1. A knife in which the core of the blade is inserted from the front end of the handle, and the blade can be removably attached to the handle; the core has a hole, and the core is inserted inside the handle. A locking portion that fits into the hole and fixes the blade when inserted is elastically supported on the handle by an elastic member, and the locking portion is elastically supported by the deformation of the elastic member. The handle is movable in a direction substantially perpendicular to the surface of the core, and is further provided with means inside the handle for deforming the elastic member by an external force in order to remove the locking portion from the hole in the core. , a cutlery characterized in that the operating part of the elastic member deforming means is exposed on the outside of the handle.