HK1123255B - Folding tool - Google Patents

Description

Folding tool

Technical Field

The present invention is a folding device having a mechanism for securely and reliably fastening and easily releasing an opening and closing lock provided in a pocket knife or the like.

Background

In a conventional lockable pocket knife, a back spacer is rotatably connected to a back portion between a pair of side plates by a spindle, a blade body base end is foldably connected to a tip portion between the two side plates by the spindle, and a convex portion of an end portion of the back spacer is engaged with an end portion back-side concave portion. When closing the opened blade body, it is necessary to hold the tip with the fingers of one hand while closing with the other hand in order to release the lock of the portion where the convex portion of the end of the back spacer engages with the end back-side concave portion of the blade body.

In addition, the pocket knife is formed such that one side plate of its paired side plates is made into a long arm-shaped spring and is slightly bent in a direction in which pushing pressure is applied to the blade body when the knife is closed, and when the blade body of the knife is in an open state, the tip of the arm-shaped plate and the locking surface of the web of the tang of the blade body are fastened. When the blade body is closed, the blade end of the blade body is in the rotation line; and when the lock is released, the arm-shaped plate must be pushed with one hand for release and the blade body must be closed with the other hand, which is extremely dangerous. Furthermore, there are some drawbacks, such as: when strong pushing pressure is applied to the back of the blade body, strong pushing force is applied to the arm plates of the side plates, thereby causing bending and shortening of the length of the arm plates; and the urging force on the locking portion of the blade body is weakened, thereby eliminating the locking function. There is also a locking method (patent document 1) in which a locking portion is connected to the back of the knife so that when the blade body is closed, a finger is not located in a rotation line of the blade end of the blade body; however, the strength of the arm shape is considered insufficient for the pushing pressure for closing the blade body.

Patent document 1: japanese patent H10-179945

Disclosure of Invention

Problems to be solved by the invention

In general, there are many proposals for improved techniques. Although mechanisms that can be safely locked have been proposed, it is necessary to place the finger in the line of rotation of the blade end when closing, which is disadvantageous from a safety point of view and lacks sufficient strength; therefore, such proposal is insufficient from the viewpoint of safety. The object of the present invention is to solve these disadvantages.

Such problems are not limited to knives, but are common to key holders and small tool holders for screwdrivers, saws and the like.

Means for solving the problems

The object of the invention is achieved according to a folding tool, characterized in that: having one side plate (1a) and the other side plate (1 b); and an arm plate (2) having a pushing pressure is provided using a part of the back side of the other side plate (1b) or is provided at the inner side separately connected; a projection (3) is provided at the end of the arm plate; base ends of the bodies (5) to which the back-side concave portions (6) are connected are axially connected so as to be foldable to base ends of the one side plate and the other side plate by the spindle (4); and the concave portion (6) and the convex portion (3) of the end portion of the body (5) are engaged and locked.

Effects of the invention

The present invention is configured as described above, and has the following effects: when folded, can be unlocked in a safe position without the need for a holding body and handle, and without the need for placing a hand in the line of rotation of the blade end of the blade body as is conventional.

Also, when strong pushing pressure is applied from the rear of the main body, pulling pressure is generated in the convex portions of the base ends of the arm plates of the side plates. With the conventionally produced side plate, the arm-shaped plate is disposed on the belly (vertical port), and the end belly lock portion of the blade body and the engaged liner lock (liner lock) exert pushing pressure on the arm, the locking function of the arm is weakened; however, the present invention has the following effects: the strength of the locking function of the arm is maintained and the blade body can be opened smoothly like a conventional pad lock.

As with knives, the present invention can safely house (store) keys, saws and various types of tools, releasing them as needed for use.

Drawings

FIG. 1 is a view showing the component parts of the pocket knife of the present invention;

fig. 2 is a view showing a state where the blade body accommodating space of the present invention is provided;

FIG. 3 is a view showing an intermediate state during full opening of the blade body of the present invention;

fig. 4 is a view showing a state in which the blade body of the present invention is fully opened;

FIG. 5 is an enlarged end view of the A-A end of FIG. 4;

FIG. 6 is a view showing an intermediate state during closing of the blade body of the present invention;

fig. 7 is a view showing a state in which the blade body of the present invention is closed;

FIG. 8 is an enlarged end view of A '-A' of FIG. 4;

fig. 9 is a view of a state where a long back spacer is assembled in the present invention;

fig. 10 is a view showing example (1) whereby the lock can be released without releasing the button;

fig. 11 is a view showing example (2) whereby the lock can be released without releasing the button;

fig. 12 is a view showing example (3) whereby the lock can be released without releasing the button;

fig. 13 is a view showing a state of the present invention in which the blade body is reliably fastened and is not easily opened;

FIG. 14 is an example with a saw attached to the present invention;

fig. 15 is a view showing an example of a side plate.

Detailed Description

Although the body in the present invention of course means the blade body of the knife, it can be applied to saws or screwdrivers in small tool holders and keys in key holders, in addition to the blade body of the knife.

Although the knife of the present invention is applicable to knives, which typically include pocket knives, gravers, and the like, it is particularly suitable for pocket knives, among others.

Although metals such as stainless steel, titanium and aluminum may be preferably used for the material of one side plate, and if the arm plates are separately connected, may also be preferably used for the material of the opposite side plate, plastics including reinforced plastics (reinforced plastics), wood including reinforced wood (reinforced wood), and the like may also be applied.

The following provides a detailed description using a pocket knife as an example. Of course, the present invention is not limited to the following examples. The description of some other small tools may be substituted if the blade body is replaced with a screwdriver, saw, etc.

Of course, as shown in fig. 1, the arm-shaped plate may be constituted by a part of the other side plate, but may be provided separately from the other side plate and connected by a spindle.

Fig. 1 is a view showing components constituting a pocket knife of the present invention.

Fig. 2 is a view showing a state where a back spacer (8a) is connected to a pair of side plates (1a, 1b) to provide a housing space for the blade body (5).

The opening and closing steps are described below with reference to fig. 3 to 8.

Fig. 3 is a view showing a state in which the finger rest (9) of the blade body (5) has been rotated by the thumb to open the blade body (5) to approximately 90 degrees. The figure shows the blade body (5) in a fully open state, with the steel ball (10) attached to the arm plate (2) in a displaced state, released from the blade body locking recess (18a) of the blade body tang (14).

In fig. 4, by further opening by means of the finger rest (9) until the stopper pin locking portion (16) of the blade body tang (14) contacts the stopper pin (15), the convex portion (3) of the base end of the arm-like plate engages the end back side concave portion (6) of the blade body (5), thereby locking it securely. At this time, the contact surface (11) of the convex portion at the base end of the arm plate and the contact surface (12) of the back side concave portion at the end of the blade body are tightly fitted together due to the pushing pressure of the arm plate.

The position where the so-called arm-shaped plate base end (26) is provided in the present invention may be located at the back of the other side plate (1b) as shown in fig. 1, forming the other side plate (1b) discontinuously, or may be located at the inner side of the back of the other side plate (1b), forming the other side plate (1b) continuously. The latter is more preferable from the viewpoint of strength. When the arm-shaped plate (2) is separately connected, the other side plate (1b) may be continuous or discontinuous as described above. From the viewpoint of strength, the other side plate (1b) is more preferably continuous.

Fig. 5 is an enlarged view of the end surface thereof (i.e., of fig. 4).

Fig. 6 is a view showing the blade body (5) in a partially closed state.

By pressing the lock release button (7), the tight-fitting portion of the arm-shaped plate base end convex portion contact surface (11) is released from the blade body end back side concave portion contact surface (12), a movement space for the protruding portion of the steel ball (10) is obtained, so that the blade body ridge (13) can be pressed with a slight force to start the rotation of the blade body (5) around the center of the spindle (4).

Fig. 7 is a view showing the blade body (5) in a fully closed state. By pressing the blade body ridge (13) to cause rotation of the blade body (5) about the center of the spindle (4) and not closing the blade body (5) until the finger rest (9) contacts the side plate (1a), a tight fit occurs due to the blade body locking recess (18a) of the blade body tang (14) so that the blade body (5) can be safely held without being easily opened.

Fig. 8 is an enlarged view of the end face a '-a' thereof (i.e., of fig. 7).

Fig. 9 is another example according to an embodiment of the present invention, in which the folding pocket knife of fig. 2 is an example in which the back spacer (8b) is elongated.

Fig. 10 is a view showing an example in which the shape of the arm plate (2) is raised in the back side direction.

Fig. 11 is a view showing an example in which the shape of the arm plate (2) is elongated and bent inward.

Fig. 12 is a view showing an example in which a notch portion is provided in the other side plate (1b) in order to make the operation of the arm plate (2) easier, so that the operation of the arm plate (2) is made easier.

In fig. 13, a columnar protrusion (17) is provided at the arm-shaped plate base end convex portion (3), and a blade body locking concave portion (18b) of the blade body tang (14) is deepened; although this is to prevent easy opening when the blade body (5) is closed and securely fastened, the lock can be easily released by pressing the lock release button (7). (refer to FIGS. 7 and 8)

The invention can be advantageously applied to pocket knives, but it can also be applied to a wide range of knives, such as gravers, kitchen knives, chisels, etc., and of course, office supplies, tools, keys, household products, cosmetics, etc.

Industrial applicability

Since the technique of the present invention is a lock that can be safely and easily released, it can be preferably applied not only to knives, particularly, pocket knives, but also to a wide range including office supplies, keys, home products, cosmetics, and the like.

Description of the reference numerals

1 a: side plate

1 b: side plate

2: arm-shaped plate

3: arm-shaped board base end convex part

4: mandrel

5: knife blade body

6: concave part at back side of blade body

7: lock release button

8 a: back spacer

8 b: back spacer

9: finger holder

10: steel ball

11: arm-shaped plate convex contact surface

12: cutting edge body back side recess contact surface

13: back ridge of knife edge body

14: shank of blade body

15: stop pin

16: locking part of stop pin

17: cylindrical projection

18 a: blade body locking recess

18 b: blade body locking recess

19: end of the cutting edge

20: mandrel fixing screw

21: locking release button fixing screw

22: finger support fixing screw

23: saw with cutting blade

24: base end of side plate

25: base end of blade body

26: arm-shaped board base end

Claims (10)

1. A folding tool, comprising:

a first side panel and a second side panel, the first and second side panels defining a receiving space therebetween;

an arm plate formed in a back-side portion of one of the first and second side plates, the arm plate having a longitudinal axis and being applied with a pushing pressure toward the accommodation space and having a tip with a projection defining a hook portion;

a blade body foldably connected between the first and second side panels by a spindle and foldable between a first position in which the blade body is received in the receiving space and a second position in which the blade body is in an open state, the blade body having a recess on a back side of the blade body, the recess defining a notch-shaped portion, the notch-shaped portion being configured for engaging the hook-shaped portion of the arm plate when the blade body is in the open state, thereby locking the blade body in the open state, wherein when said blade body is locked in said open condition and pressure is applied to said blade body to fold said blade body toward said first position, the engagement between the hook and the notched portion causes a tensioning force to be applied to the arm plate in a direction substantially parallel to the longitudinal axis of the arm plate.

2. The folding tool of claim 1 wherein the convex portion of the arm plate and the concave portion of the blade body are shaped such that the convex portion engages the concave portion.

3. The folding tool of claim 2 wherein the arm plate is biased toward the receiving space.

4. The folding tool of claim 3 wherein said arm plate defines a spring arm that automatically locks said blade body in said open state when said blade body is folded from said first position to said second position.

5. The folding tool of claim 1 including a lock release button on said arm plate.

6. The folding tool of claim 5 wherein said blade body is foldable from said second position to said first position by depressing said lock release button to release the lock of said blade body.

7. The folding tool of claim 1 wherein said arm panels are integral parts of said side panels.

8. The folding tool of claim 1 wherein the arm plate is connected to the side plate.

9. The folding tool of claim 1 including a stop pin extending between said first and second side panels.

10. The folding tool of claim 1 wherein the folding tool is a knife.