JPS5846786Y2 - swivel knife - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved structure of a swivel knife whose blade portion can rotate relative to the holder.

A swivel knife with a rotatable blade is extremely convenient for cutting out various types of public notices, photographs, and other materials.

This is because these cutting operations involve curves, especially complex curves, rather than straight lines.

When performing this type of cutting work using a general knife, the paper to be cut or the knife must always be moved along the curve, which is very cumbersome and
I couldn't finish it beautifully.

With the advent of the swivel knife, the above-mentioned problems have been eliminated, and it has become easier to cut not only straight lines but also complex curves.

The basic structure of a swivel knife is characterized by the fact that the center of rotation of the blade, which is rotatably provided on the main body, is eccentric to the cutting edge of the blade.

With this structure, the cutting edge of the blade can change direction with a small force against the main body, and can follow complicated curves.

Broadly speaking, there are two types of swivel knives known.

One of them has a structure in which a support body is rotatably provided to the main body, and a blade body is attached to the support body in a replaceable manner.

Another method is to fix the blade and the shaft made of synthetic resin etc. together to form a single blade part, and to form a support part on the main body side that can rotatably support this blade part. However, the blade part itself is configured to be replaceable with respect to the main body.

In this type, means for attaching and detaching is provided on the blade parts and the supporting portion of the main body.

As the former swivel knife 100, one having a structure shown in FIG. 7, for example, is known.

This includes a main body 101, a support 104 having an eccentric shaft 102 and a receiving hole 103, a blade 105 inserted into the receiving hole 103, and a tightening screw for fixing the blade 105 to the support 104. It consists of a fixture 106 such as.

The eccentric shaft 102 of the support body 104 is inserted into a hole at the tip of the main body 101 and is rotatably attached.

The blade 105 utilizes one tip of a well-known folding blade.

The cutting edge 107 of the blade body 105 and the axis of the eccentric shaft 102, that is, the rotational axis O, are eccentric by a distance.

Although the swivel knife 100 is not shown,
There is a mechanism at the end of the main body 101 that can stop the rotation of the eccentric shaft 102, and by selectively rotating this mechanism, the rotation of the eccentric shaft can be stopped and the state similar to that of a normal knife can be achieved. Alternatively, it can be used as a swivel knife.

However, this swivel knife 100 has an eccentric shaft 102.
Although the main body 101 and the main body 101 are rotatably attached, the rotational resistance is very large due to the large diameter of the shaft, and even if they are eccentric, the support 104 and the blade 105 do not easily rotate relative to the main body 101. There is.

In fact, the swivel knife 100 is designed such that the support 104 is forcibly moved by placing the index finger on it.

Therefore, during the cutting operation, the support 104 and the blade 105 must be moved relative to the main body 101 using the index finger, which is tiring and not only makes it difficult to perform long-term operations, but also prevents fine cutting.

In addition, since only the blade 105 is replaced, this may seem reasonable at first glance, but since the blade 105 must be directly picked and inserted into the receiving hole 103, there is a danger, for example, when the blade 105 is replaced. I often cut etc.

Also known is a swivel knife in which a small bearing is interposed between the support and the main body in order to improve the rotatability between the two.

This type of swivel knife is superior to the swivel knife shown in Figure 7 because the support and blade can rotate smoothly relative to the main body, but it also has a bearing inside the elongated main body, albeit a small one. The problem was that the structure was extremely complicated, and the assembly was not only complicated, but also expensive.

Next, I will talk about the latter, the swivel knife.

As a swivel knife related to this, a structure clearly shown in FIG. 8 is first known.

The swivel knife 200 has a main body 201. Support body 202
, from the blade body part 203.

There is a shaft portion 204 with a reduced diameter on the front side of the main body 201,
Its tip is made into a hemispherical part 205, and the shaft part 204
On the outer periphery of is a deodorizing peripheral part 206 which forms part of the means for attaching and detaching.
is modeled.

The blade part 203 includes a blade 207 and a shaft 2 made of synthetic resin or the like.
In many cases, these are integrated at the same time as the shaft body 208 is formed, and the diameter of the tip of the shaft body 208 is reduced to form a stepped portion 209.

The support body 202 rotatably holds the blade part 203 and allows the rear end surface 210 of the blade part 203 to be housed in the hemispherical part 205 on the main body 201 side. Receiver 7121 that accommodates the shaft body 208
1 and a fitting hole 212 continuous thereto into which the shaft portion 204 of the main body 201 is fitted.

The frontmost portion of the receiving hole 211 has a small diameter, and a stepped portion 213 that fits the stepped portion 209 of the blade component 203 is formed.

The support body 202 in which the fitting hole 213 is located has a groove 214 formed in a cross pattern that reaches the rear end thereof, and functions as a so-called bullet piece.

On the inside of the bullet piece 215, there is provided a recessed circumferential portion 216 that fits the odor removal circumferential portion 206 on the main body 201 side.

The blade part 203 is inserted from the fitting hole 212 side of the support body 202, both stepped portions 209 and 213 are fitted together, and then the support body 2
02 and the main body 201 are combined and assembled as shown in FIG.

In such a swivel knife 200, the rear end surface 210 of the blade part 203 comes into contact with the hemispherical part 205 of the main body 201, which is theoretically a point contact.

Furthermore, the movement of the blade part 203 in the forward direction (to the left in the figure) is regulated by the stepped portions 209 and 213, thereby preventing it from coming off.

Therefore, the axis of the shaft 208 of the blade part 203 and the main body 201
The rotation axis O and the cutting edge 217 of the blade body 207 are eccentric by a distance.

Therefore, the blade part 203 includes the support body 202 and the main body 201.
In particular, the rear end surface 210 of the blade part 203 and the hemispherical part 205 of the main body 201
Since the connection is point contact, it has the advantage of extremely low rotational resistance.

However, such a swivel knife 200 has a blade part 2.
Although the rotatability of 03 was good, it was extremely unsatisfactory in terms of replacement of the blade part 203.

In other words, when replacing the blade part 203 itself, the support body 202 must be separated from the main body 201 one by one. However, in this case, the surface of the support body 202 has a non-slip surface, but the finger must be placed on the same surface. When it hits and moves in the axial direction, it also presses down the bullet piece 215, so the deodorizing peripheral part 206
It was difficult to undo the engagement between the and the hanging part 216.

For this reason, the above-mentioned engagement cannot be released without applying a considerable force, and the replacement work is complicated and inefficient.

Furthermore, if too much force is applied, the fingers may trip, and the tripped fingers may touch the blade body 207 and cause a cut, which is extremely dangerous.

A swivel knife disclosed in US Pat. No. 3,886,656, for example, is known as a device that overcomes these difficulties.

This does not have the support mentioned above, and the tip of the main body is provided with a receiving hole into which the blade part can be inserted from the front.

A ball is irremovably inserted into the innermost part of the receiving hole, so that it receives the thrust force of the blade parts through point contact.

Further, to prevent the blade part from coming off from the main body, a neck part provided on the shaft of the blade part, a notch part reaching the receiving hole, and a bullet piece supported on the main body side are provided, respectively. This is done by the free end entering the notch and engaging the neck of the blade part.

Of course, the blade part can be removed from the main body by manipulating the bullet to release the engagement between the free end of the bullet and the neck.

Such a swivel knife has extremely good rotatability, partly because it is equipped with a ball, and is very convenient because the blade parts can be easily replaced by simply manipulating the bullet.

However, the swivel knife is provided so that the bullet piece is exposed from the main body for convenience of operating the bullet piece.

For this reason, this has the disadvantage that it is difficult to grip because it gets in the way, and the cutting edge of the blade is hidden and difficult to see during cutting operations.

While holding the main body, it is often the case that the blade parts come inadvertently detached from the main body due to contact with the bullet, and must be reattached each time.

In addition, inserting or removing blade parts from the main body is often done by pinching the vicinity of the blade, but there are times when the blade comes into direct contact, which is unsatisfactory in terms of safety. Ta.

Furthermore, in order to improve rotation performance, a ball is provided on the main body side, but it must be configured so that it does not come off, which makes the structure complicated, and the assembly is troublesome and expensive. There was a problem.

This invention was devised in view of the various problems of slanting and to solve them all at once.

The main purpose of the present invention is to provide a swivel knife that improves the rotatability and attachment/detachment performance of blade parts to the main body, and also simplifies the structure and is inexpensive.

The second purpose of the present invention is to drill a receiving hole in the tip of the main body into which the shaft of the blade component is inserted, and to provide several slots in the main body where the receiving hole is located to reach the receiving hole. A groove is cut to form a bullet piece, and a hook is provided on a part of the receiving hole side of each bullet piece.
On the other hand, to provide a swivel knife in which a part of the shaft of the blade part is provided with a latching part that matches the latching part so that the blade part is held rotatably and detachably from the main body. be.

The third purpose of this invention is to make the rear part of the shaft of the blade part conical so that it makes point contact with the innermost receiving surface of the receiving hole drilled in the main body, thereby reducing the rotational resistance of the blade part. We offer a variety of swivel knives.

The fourth purpose of the present invention is to make the innermost receiving surface of the receiving hole a conical bearing surface that is more gently inclined than the male part of the blade part, and to make the blade part so that these apexes are in contact with each other. To provide a swivel knife which reduces the rotational resistance of parts and defines the center of rotation.

A fifth object of the present invention is to provide a push ring which can be screwed against the main body at a position outside the bullet of the main body, and to form a flange on the shaft of the blade component, and to To provide a swivel knife in which the engagement between a blade part and a main body is released by pushing the blade part by screwing the body.

A sixth object of the present invention is to provide a swivel knife in which the flange has a narrow shape corresponding to the thickness of the blade body so that the cutting edge of the blade body can be easily seen during cutting operations. There is something to do.

A seventh object of the present invention is to provide a swivel knife in which safety is improved by having the flange so that the blade part can be gripped when being attached to and detached from the main body.

The first object of the present invention is to allow only the blade body to be buried in the soft base of the case for storing replacement blade parts and to function as a seat plate due to the presence of the flange. To provide a swivel knife which improves the erectability of blade parts and facilitates insertion into a main body.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of embodiments of the present invention will be explained below based on the drawings.

FIG. 1 is a front view showing the overall aspect of the swivel knife of the present invention, FIG. 2 is a side view of FIG. FIG. 5 is an enlarged longitudinal sectional view showing the structure of only the blade parts.

The main parts of the swivel knife 1 of the present invention include a main body 2, a press ring 3 provided as necessary, and a blade part 4.

The main body 2 is made of, for example, an aluminum alloy, has an elongated cylindrical shape and is easy to grip, and has a receiving hole 5 drilled in the longitudinal axis direction from the tip to a certain depth. .

The portion of the main body 2 where the receiving hole 5 is located is provided with several grooves 6 that reach the receiving hole 5, and this portion of the main body 2 becomes a so-called bullet piece 7.

In the case of this embodiment, the grooves 6 are cut in a cross shape as shown in FIG. 4, and four bullet pieces 7 are formed in total.

Of course, the number of grooves 6 is not limited to this.

An engaging portion 8 for preventing the blade part 4 from being removed is formed on the inner surface of the bullet piece 7 on the receiving hole 5 side.

In the case of this embodiment, the latch portion 8 is located around the periphery of the hook recess, as shown in FIG.

This is because it is easier to shape in this way.

Further, a male screw 9 is carved into the main body 2 near the rear of the bullet 7 (on the right side in FIG. 3), and this male screw 9 is provided at a part of the main body 2 whose diameter is reduced by one step from the outer periphery.

Due to this, a stepped portion 10 is formed near the rear of the male screw 9.

The outer surface of the main body 2 further behind the male screw 9 is knurled or the like to form a locking surface 11.

The pushing ring body 3 is fitted onto the bullet piece 7 and the male screw 9 portion of the main body 2, and fits into the male screw 9 and a loose fitting hole 12 bored from the tip into which the bullet piece 7 portion is loosely fitted. It is equipped with a female screw 13.

The press ring body 3 is made of, for example, the same aluminum alloy as the main body 2.

The outer circumference of the first half of the press ring body 3 is formed into a tapered inclined circumferential surface 14, and the outer circumference of the second half is formed into a locking surface 15 by knurling or the like.

The outer diameter of the locking surface 15 and the maximum outer diameter of the main body 2 are approximately equal.

The blade part 4 consists of a blade 16 and a shaft 17.
6 is made of cutter steel, for example, and the shaft body 17 is molded of synthetic resin or the like, and these are pressed together when the shaft body 17 is molded.

A collar portion 18 is provided on the front side of the shaft body 17, and a hook portion 1 that fits the hook portion 8 provided on the main body 2 side is provided closer to the rear of the collar portion 18.
9 is sculpted.

Further, the rearmost portion of the shaft body 17 is sharpened to form a male portion 20.

The flange 18 may have a disc shape, but in the case of this embodiment,
As shown in FIG. 2, both sides of the disc are cut out to match the thickness of the blade 16 to form an oval shape.

In other words, it is thin.

In the case of this embodiment, the engaging part 19 is located on the odor evacuation peripheral part so as to engage with the engaging part 8 on the main body 2 side.

If the engaging part 8 on the main body 2 side is made convex, the shaft 1
The engaging portion 19 on the 7 side is formed into a concave shape.

Next, we will discuss the dimensions and positional relationships of each part.

Assuming that the outer diameter of the engaging portion 19 is Dl, the outer diameter of the shaft body 17 is D2, the outer diameter of the bullet 7 at normal time is D3, and the inner diameter of the loose fitting hole 12 is D4, the one-side protrusion amount S1 of the engaging portion 19 is: DI D2/2
Therefore, the gap S2 between the loose fitting hole 12 and the bullet piece 7 at normal time is D
4-D3/2.

This gap S2 is set to be larger than the gap S1,
Even if the push ring body 3 is attached to the main body 2, the bullet piece 7 is arranged so that it can expand its diameter and engage and disengage from the blade part 4.

Of course, the inner diameter of the receiving hole 5 is made slightly larger than the outer diameter D2 of the shaft body 17, and the inner diameter of the engaging part 8 is also set to be equal to or slightly larger than the outer diameter D1 of the engaging part 19.

The male part 18 provided on the shaft 17 of the blade part 4 is designed to always fit into the innermost receiving surface 21 of the receiving hole 5 on the main body 2 side, especially during cutting operations, and at that time, the engaging parts 8 and 19 Place it so that there is a gap in the axial direction.

Although there may be no gap between the engaging parts 8 and 19 on the front side, a gap S3 is formed on the rear side.

If the gap S3 is provided in this way, the male part 18 and the innermost receiving surface 2
1 will always come into contact during cutting work.

Further, a gap S4 is formed between the flange 18 on the blade part 4 side and the front end of the bullet 7 on the main body 2 side and the front end of the push ring body 3,
Set these so that they do not come into contact with each other during cutting work.

The maximum outer diameter of the collar portion 18 is set to be larger than the inner diameter of the receiving hole 5 of the push ring body 3, so that when the push ring body 3 is screwed forward, they will come into contact with each other.

The innermost receiving surface 21 of the receiving hole 5 may be a flat surface, but in the case of this embodiment, it is a conical surface as shown in FIG. It is being done to the inclination.

When placed in this manner, the sharp parts of the male part 18 and the conical recessed surface 21 will come into contact with each other at this time.

However, due to this, the rotational axis of the blade part 4 is determined.

Of course, in this case, it will be a point contact like in the case of a plane.

Since the present invention is a swivel knife, the rotational axis O of the blade body part 4 and the tip 22 of the blade body 16 are eccentric by a distance.

Since the present invention has such a structure, its function and the procedure for attaching and detaching it will be explained next.

1 and 3 show a state in which the blade part 4 is attached to the main body 2, and in this assembled state, the main body 2 is gripped and used for cutting work.

During the cutting operation, the cutting edge 22 of the blade body 16 comes into contact with the object to be cut (not shown), and moves the main body 2 in the cutting direction while pressing the object toward the object.

At this time, the male part 20 on the blade part 4 side and the innermost receiving surface (conical concave surface) 21 of the receiving hole 5 of the main body 2 are in point contact and normally aligned, and the thrust force of the blade part 4 is applied to the main body 2. It is highly recommended.

Of course, the shaft 17 of the blade part 4 is rotatably supported in the receiving hole 5 of the main body 2, and the presence of the engaging parts 8 and 19 prevents the blade part 4 from accidentally falling off from the main body 2. There's nothing wrong.

Therefore, due to the eccentricity between the rotation axis O of the blade part 4 and the cutting edge 22, the blade part 4 can be rotated with an extremely small force and can cut complicated curves.

When the blade 16 of the blade part 4 becomes dull, it is replaced.

In this case, when the push ring body 3 is screwed relative to the main body 2,
First, after its tip abuts against the flange 20 of the blade part 4, when the blade is moved further forward, the engaging part 19 is pulled out from the engaging part 8.

At this time, since the bullet piece 7 can expand in diameter, this operation can be performed, and then the blade part 4 is removed from the receiving hole 5 of the main body 2 by pinching the flange part 20.

Another method of removal is to insert a nail, screwdriver, or other thin rigid object into the gap S4 between the flange 18 of the blade part 4 and the push ring body 3, and pry the engaging parts 8 and 19 apart. The blade part 4 can be removed from the receiving hole 5 of the main body 2 by resisting the elasticity of the blade part 4.

In either method, if the engaging part 19 is completely removed from the receiving hole 5, when the main body 2 is turned downward, the blade part 4 will be moved by gravity.
falls.

Therefore, it is possible to dispose of the blade body 16 in a trash can or the like without touching the blade body 16 with fingers or the like.

When attaching a new blade part 4 to the main body 2, insert the shaft 17 of the blade part 4 into the receiving hole 5 and press until the engaging part 8.19 is engaged, and the elastic piece 7 will expand. It is securely attached by the radial movement and subsequent return movement.

At this time, the blade 1 can be removed by pinching the flange 18.
There is no need to touch 6.

Incidentally, if the new blade part 4 is placed in a case 23 shown in FIG. 6, it will be very convenient to attach it to the main body 2.

The case 23 is composed of a soft base 24 made of styrofoam or the like and a lid 25 made of transparent material or the like, which are fitted together so that the lid can be opened freely.

The blade part 4 is placed on the soft base 2 with the blade 16 facing down.
4, and due to this, the shaft body 17 is in an upright state.

In this case, the flange 18 of the blade part 4 comes into contact with the upper surface of the soft base 24 and functions as a so-called seat plate, thereby establishing the establishment of the blade part 4 and preventing it from being buried in the soft base 24. regulate.

Since the blade part 4 housed in such a case 23 has its shaft 17 in a vertical position, if the cover 25 is removed, the main body 2 can be mounted close to it as shown in FIG. I can do things.

In this case, when it is attached to the main body 2, a single drop does not touch the blade body 16, and the blade parts 4 stored in the case 23 are also directly connected because the blade body 16 is buried in the soft base 24. There's nothing to touch.

Moreover, since the blade body 16 is surrounded by the soft base 24, even if the temporary case 23 is dropped, it will not be damaged.

As mentioned above, according to the present invention, the rear end of the blade part is made into an armor part and brought into contact with the innermost receiving surface of the main body, so thrust force can be received by point contact, and the blade part can reduce rotational resistance.

Instead of having a ball or making it hemispherical as in the past, the innermost receiving surface can be formed at the same time as drilling the receiving hole, and
The armor part can be molded at the same time as the shaft body, which is extremely convenient, and no special processing or parts are required.

Since the tip of the main body is made of a bullet and a hooking portion is provided on the receiving hole side, the blade part can be rotatably hooked without adding any other parts.

Since a flange is formed at the tip of the shaft of the blade component, this can be used when detaching the blade component from the main body, and it can also be pinched without directly touching the blade.

However, if it is installed on the soft base of the case, it can be used as a seat board.

If a push ring is screwed onto the tip of the main body, and the screw movement of the ring allows the blade part to be detached from the main body, this detachment can be done with a relatively small operating force. Able to complete the action.

In addition, when the flange is made thin in accordance with the thickness of the blade, it is easy to check the blade edge during cutting work, and it is possible to easily follow complicated curves, etc. It is effective.

[Brief explanation of drawings]

Fig. 1 is a front view showing the overall aspect of the swivel knife of the present invention, Fig. 2 is a left side view of Fig. 3, Fig. 3 is an enlarged front view of the main part shown in longitudinal section, and Fig. 4 is IV-I in Figure 3
5 is an enlarged vertical sectional front view showing the structure of only the blade parts, and Figure 6 shows the state in which an appropriate number of new blade parts are housed in the case and the swivel knife of the present invention. Fig. 7 is a front view of the main part of a conventional swivel knife, showing how only the blade is replaceable. FIG. 8 is a front view of a main part of another conventional swivel knife, showing a type in which the blade part, which is an integral part of the blade body and the shaft body, is replaceable. 1 is a swivel knife, 2 is a main body, 3 is a push ring body, 4 is a blade part, 5 is a receiving hole, 6 is a split groove, 7 is a bullet piece, 8 is a hooking part, 9
is a male screw, 12 is a loose fitting hole, 13 is a female screw, 16 is a blade body,
17 is a shaft body, 18 is a flange part, 19 is a hook part, 20 is an armor part,
21 is the receiving surface, 22 is the cutting edge, S4 is the gap, O is the rotation axis,
L is distance.

Claims (1)

[Scope of utility model registration request] 1. A main body 2 that can be gripped elongately, a receiving hole 5 drilled in the axial longitudinal direction from the tip of the main body 2 to a predetermined depth, a receiving surface 21 formed at the innermost part of the receiving hole 5, and the receiving hole 5. A bullet piece 7 formed by cutting an appropriate number of grooves 6 from the tip of the main body 2 where the bullet piece 7 is located, a hooking part 8 formed on the receiving hole 5 side of the bullet piece 7, and a blade body 16. A blade part 4 having a shaft 17 that is integrally provided therewith and can be rotatably inserted into the receiving hole 5; and a flange 18 formed at the tip of the shaft 17 of the blade part 4;
A hooking portion 19 is formed on the shaft body 17 near the rear of the collar portion 18 and fits into the hooking portion 8 on the main body 2 side, and a male portion 20 is formed at the rearmost end of the shaft body 17. The rotational axis O of the blade part 4 and the tip 22 of the blade body 16 are eccentric by a distance, and at least during cutting work, the male part 20 of the blade part 4 and the receiving surface 21 of the main body 2 side are eccentric. The swivel knife is characterized in that the swivel knife is constructed so that the flange 18 of the blade part 4 and the tip of the main body 2 do not come into contact with each other. 2. The main body 2 has a structure including a push ring body 3 at its tip,
The press ring body 3 has a cylindrical shape and has a loose fitting hole 12 into which the bullet piece 7 of the main body 2 is fitted, and a female screw 13 which is screwed into a male screw 9 formed near the rear of the bullet piece 7 of the main body 2. A gap S4 is formed between the loose fitting hole 12 of the push ring body 3 and the bullet piece 7 of the main body 2 to allow the operation of attaching and detaching the blade part 4 to the main body 2,
The tip of the push ring body 3 does not come into contact with the flange 18 of the blade part 4 during cutting work, and the tip comes into contact with the flange 18 when the push ring body 3 is screwed forward. A swivel knife according to claim 1 of the utility model registration claim, characterized in that: 3. Utility model registration claim 1 or 2, characterized in that the engaging part 8 of the main body 2 is a hanging depression peripheral part, and the engaging part 19 of the blade part 4 is a deodorizing peripheral part. The swivel knife according to item 2. 4. Utility model registration claims 1 to 3, characterized in that the receiving surface 21 of the main body 2 is a conical concave surface, and its inclination is set to be gentler than that of the male part 20 of the blade part 4. A swivel knife described in any of the above. 5. The swivel knife according to claims 1 to 4 of the claims registered as a utility model, characterized in that the flange 18 of the blade part 4 is made thin in accordance with the thickness of the blade 16.