JP2015019710A - Cutter knife - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a quick back-type cutter knife that has shortened an overall length of a slider to reduce the size of a cutter body, and has improved operability.SOLUTION: A cutter knife 1 includes: a holder 3 for housing a cutter blade C; a main slide body 5 attached to the holder 3 so as to move backward and forward; a retaining mechanism 9 for retaining the main slide body in the holder 3; a secondary slide body 7 attached to the main slide body 5 so as to move backward and forward, to which the cutter blade is connected; and an elastic member 21 connected to the main slide body 5 and the secondary slide body 7 that energizes the secondary slide body 7 backward when the secondary slide body 7 is caused to move forward with respect to the main slide body 5. The main slide body 5 and the secondary slide body 7 are arranged so as to be vertically overlapped with each other.

Description

  The present invention relates to a quick back type cutter knife that automatically returns a cutter blade to its original position when a finger is released from a button.

  Conventionally, as this type of cutter knife, there are a main body, a sliding body (slider) movable in the front-rear direction with respect to the main body, an elastic member that constantly biases the sliding body rearward, and a cutter connected to the sliding body. It consists of a blade or the like. When such a cutter knife grips the main body and moves the slider forward with the thumb against the elastic member, the tip of the cutter blade protrudes from the main body, thereby cutting the object to be cut and releasing the thumb. The sliding member is instantaneously moved back by the elastic member, and the cutter blade is accommodated in the main body.

  As an improved example, there is, for example, a slider divided into a main sliding body and a sub-sliding body. This is because the position of the cutter blade is roughly adjusted by the main sliding body placed in the main body, and the sub-sliding body urged backward with respect to the main sliding body by the elastic member is moved forward. Make the tip protrude from the body. When the thumb that has moved the sub-sliding body forward is released, the cutter blade connected to the sub-sliding body can be retracted by the elastic member and stored in the main body (see, for example, Patent Document 1).

JP 2000-42262 A

  However, in the conventional cutter knife as described above, the main sliding body and the sub-sliding body are juxtaposed in the front-rear direction (sliding direction), so the total length of the slider becomes long, and a holder for storing this is inevitable. It has become a hindrance to miniaturization. Also, if the main sliding body and the sub-sliding body are juxtaposed in the front-rear direction (sliding direction), the distance from the grip end that grips the cutter body to the sub-sliding body that hangs the thumb increases, so operability decreases. It was.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a quick back type cutter knife in which the length of the entire slider is reduced to enable the size of the cutter body to be reduced and the operability is improved.

The present invention has been made to solve the above problems, and the cutter knife of the present invention is
A holder for accommodating the cutter blade,
A main sliding body attached to the holder so as to be movable back and forth;
An indwelling mechanism for indwelling the main sliding body in the holder;
A sub-sliding body that is attached to the main sliding body so as to be movable back and forth, and that connects the cutter blade;
An elastic member connected to the main sliding body and the sub-sliding body and biasing the sub-sliding body backward when the sub-sliding body is moved forward with respect to the main sliding body;
The main sliding body and the sub-sliding body are arranged so as to overlap in the vertical direction.

In the cutter knife of the present invention,
The sub-sliding body is located on the lower side of the main sliding body; and
A front operation part that is attached to the upper side of the base part and covers at least the front part of the main sliding body from the upper side;
It is preferable that the elastic member is disposed between the base portion and the front operation portion.

In the cutter knife of the present invention,
The main sliding body is a main body portion that is placed in the holder by the placement mechanism;
A rear operation unit attached to the main body,
When the rear operation unit is moved forward or backward with respect to the main body unit by a predetermined distance or more, it is preferable that the placement of the main body unit in the holder by the detention mechanism is released.

In the cutter knife of the present invention,
The indwelling mechanism includes a locking body that suppresses forward and backward movement of the main sliding body by engaging with a concave groove formed in the holder, and an elastic member that biases the locking body toward the concave groove. And
It is preferable that a sliding surface provided in the rear operation portion presses the locking body in a direction away from the concave groove in accordance with the movement of the rear operation portion in the front-rear direction with respect to the main body portion.

In the cutter knife of the present invention,
An initial state in which the sub-sliding body is located most rearward with respect to the main sliding body,
When the sub-sliding body is located at the most forward position with respect to the main sliding body as the maximum forward movement state,
The rear operation part of the main sliding body has a rear operation part sliding upper surface covered from above by the front operation part in the initial state,
The main body portion of the main sliding body has a main body sliding upper surface that slidably contacts the back surface of the front operation portion in the initial state to the maximum forward movement state,
It is preferable that the main body sliding upper surface is positioned at a height equal to or higher than the rear operation unit sliding upper surface.

In the cutter knife of the present invention,
The indwelling mechanism includes a screw portion;
It is preferable to place or release the main sliding body with respect to the holder by rotating the screw portion.

Furthermore, in the cutter knife of the present invention,
The indwelling mechanism includes a leaf spring;
It is preferable that the main sliding body is placed in the holder by elastically fitting the leaf spring into the concave groove of the holder.

  ADVANTAGE OF THE INVENTION According to this invention, while shortening the length of the whole slider and enabling size reduction of a cutter main body, it becomes possible to provide the quick back type cutter knife which improved operativity.

(A) is a perspective view of the cutter knife which concerns on one Embodiment of this invention, (b) is an expansion perspective view which shows the main sliding body and sub-sliding body of the cutter knife of (a). (A) is a longitudinal cross-sectional view of the main sliding body and sub-sliding body shown in FIG.1 (b), (b) shows the main-body part of the main sliding body in the cutter knife which concerns on one Embodiment of this invention. It is a top view, (c) is a bottom view of the rear button constituting the auxiliary sliding body.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Reference numeral 1 shown in FIG. 1 is a so-called quick back type cutter knife as one embodiment of the present invention. The cutter knife 1 includes a holder 3, a main sliding body 5, a secondary sliding body 7, and a cutter blade C. For example, a synthetic resin grip (not shown) can be provided outside the holder 3. Moreover, although the cutter blade C is a folding blade type in which a plurality of blade folding grooves are formed at a constant pitch, the cutter blade C is not limited to this and may have no folding blade grooves.

  The holder 3 bends a metal plate so that it has a substantially C-shaped cross section, and can accommodate a cutter blade C and the like inside thereof. The holder 3 has a pair of side walls 3b rising from both edges of the bottom wall 3a, and a pair of flanges 3c and 3d extending inward from the upper ends thereof, and the flange 3d on one side has a plurality of concave grooves 3e. Is formed.

  The main sliding body 5 is attached to the holder 3 so as to be movable in the front-rear direction (longitudinal direction of the holder 3). As shown in FIGS. 1A and 1B, the main sliding body 5 includes a rear slider 11 that is a main body portion and a rear button 13 that is a rear operation portion. The rear slider 11 is disposed inside the holder 3 and is placed in the holder 3 by a placement mechanism 9 described later. The rear button 13 is attached to the upper part of the rear slider 11 so as to be movable back and forth, and is located outside the holder 3.

  The sub-sliding body 7 is disposed so as to overlap the main sliding body 5 in the vertical direction. The sub-sliding body 7 includes a front slider 15 that is a base portion and a front button 17 that is a front operation portion fixed to an upper portion of the front slider 15. As shown in FIG. 2A, the front slider 15 is disposed below the rear slider 11. The front button 17 is disposed so as to cover the front portion of the rear button 13 excluding the rear end convex portion 13a and the rear slider 11 from above. Further, on the back surface of the front button 17, a sliding surface 17 a is formed that contacts the sliding upper surface 11 e formed on the rear slider 11 and the sliding upper surface 13 d formed on the rear button 13. Further, a connecting protrusion 16 protruding upward is provided at the front end portion of the front slider 15, and the cutter blade C is connected by fitting with a hole formed in the rear end portion of the cutter blade C.

  In this example, the sub-sliding body 7 can move back and forth between an initial state located farthest rearward with respect to the main sliding body 5 and a maximum forward movement state projecting most forward with respect to the main sliding body 5. Has been. Here, the moving distance from the initial state to the maximum forward movement state can be, for example, 20 mm which is two pitches of a general folding blade type cutter blade C, but is not limited thereto.

  A tension coil spring 21, which is an elastic member, is connected between the main sliding body 5 and the sub-sliding body 7. As shown in FIG. 2A, the tension coil spring 21 is connected to an engaging protrusion 15 a protruding upward provided on the front slider 15 and an engaging protrusion 11 c protruding downward provided on the rear slider 11. The The tension coil spring 21 urges the front slider 15 backward when the front button 17 is operated to move the front slider 15 forward relative to the rear slider 11.

The indwelling mechanism 9 will be described in detail below.
In this example, the indwelling mechanism 9 is provided on the main sliding body 5, and the indwelling mechanism 9 includes a locking body 23 that fits into the groove 3 e of the holder 3 and a compression coil spring 25 that biases the locking body 23. Have. As shown in FIGS. 2 (a) and 2 (b), the locking body 23 is disposed in a recess 11d that opens upward from the rear slider 11, and is similarly held by a compression coil spring 25 disposed in the recess 11d. 3 is biased outward in the width direction toward the flange 3d.

  Here, a compression coil spring 12 is disposed between the rear slider 11 and the rear button 13 as shown in FIGS. The compression coil spring 12 urges the rear button 13 to be in a neutral state with respect to the rear slider 11. That is, when the rear button 13 is moved forward or backward from the neutral state, the compression coil spring 12 urges the rear button 13 to return to the neutral position.

  Specifically, when the rear button 13 is moved forward with respect to the rear slider 11 from the neutral state, the compression coil spring 12 includes the support wall portion 11a of the rear slider 11 shown in FIG. It is compressed by the support rib 13c of the rear button 13 shown in 2 (c). On the other hand, when the rear button 13 is moved rearward from the neutral state, the compression coil spring 12 includes the support wall portion 11b of the rear slider 11 shown in FIG. 2 (b) and the rear button shown in FIG. 2 (c). And 13 support ribs 13b. In this example, as shown in FIG. 2A, the positions of the rear ends of the rear slider 11 and the rear button 13 coincide in the front-rear direction in the neutral state, but the present invention is not limited to this. When in the neutral state, the distal end 23a of the locking body 23 is disposed at the apex portion 27c located at the center of the pair of sliding surfaces 27a and 27b provided on the lower surface side of the rear button 13.

  By moving the rear button 13 back and forth with respect to the rear slider 11, the sliding surfaces 27 a and 27 b slide on the distal end portion 23 a of the locking body 23 and push the locking body 23 while compressing the compression coil spring 25. When the rear button 13 is moved by a predetermined distance or more, the engagement of the locking body 23 with the concave groove 3e is released, and the entire slider including the front button 17 and the front slider 15 and the cutter blade C are moved rearward together with the rear slider 11. The button 13 is moved in the moving direction.

  When the cutter knife 1 having the above configuration is used, the holder 3 (or grip) is gripped, and the rear button 13 is operated with the thumb so that the main sliding body 5, the auxiliary sliding body 7 and the cutter blade C are brought together. Move to determine the approximate position. At this time, since the tip of the cutter blade C is located in the holder, safety can be ensured. When the member to be cut is cut, the front button 17 is temporarily moved forward with the thumb so that the cutter blade C protrudes from the tip of the holder 3. After use, when the finger is released from the front button 17, the cutter blade C automatically returns to its original position. The main sliding body 5 is so-called auto-locked with respect to the holder 3 by the indwelling mechanism 9 and does not move back and forth unless the rear button 13 is operated.

  In the cutter knife 1 of this embodiment, the main slider 5 and the sub-slider 7 are arranged so as to overlap in the vertical direction, so that the length of the entire slider is longer than that of the conventional slider arranged in parallel in the front-rear direction. This makes it possible to reduce the size of the cutter knife.

  Further, in the work such as unpacking the cardboard, the cutter knife is often gripped so that the rear end of the cutter knife is in contact with the center of the palm. In such a case, the front button 17 and the rear button 13 operated with the thumb are particularly used. The position is preferably rearward. In the cutter knife 1 of the present embodiment, since the front button 17 is arranged so as to cover the front portion of the rear button 13 from the upper side, the position where the finger is applied when the front button 17 is moved forward is operated backward. Can be made easier. In particular, in a folding blade type cutter knife, the position of the slider must be moved forward each time the cutter blade C is folded, so the cutter knife of the present invention is more effective.

  Moreover, in the cutter knife 1 of this embodiment, since the rear-end convex part 13a of the back button 13 is not covered with the front button 17, it is easier to operate the back button 13 and to move the whole slider. It becomes.

  Further, in the cutter knife 1 of the present embodiment, it is preferable that the sliding upper surface 11 e formed on the rear slider 11 is positioned at the same height or higher than the sliding upper surface 13 d formed on the rear button 13. . With such a configuration, even when the front button 17 is moved forward from the front end of the rear button 13, the sliding upper surface 11e of the rear slider 11 supports the sliding surface 17a of the front button 17 from below. Therefore, the rear end portion of the front button 17 is not bent and falls downward. As a result, when the front button 17 returns to the original position, the front button 17 is not caught on the front end surface of the rear button, and returns to the original position smoothly.

  Here, in the cutter knife 1 of the present embodiment, when the rear button 13 is moved forward with respect to the rear slider 11, both the front slider 15 and the front button 17 also move forward, In addition, a force that resists the elastic force of the tension coil spring 21 is required. From this point of view, in the present embodiment, as shown in FIG. 2B, the locking body 23 is disposed on the front side of the central position in the length of the compression coil spring 12. That is, of the length of the compression coil spring 12, the length w1 of the area on the front side of the center of the locking body 23 is shorter than the length w2 of the area on the rear side. Thereby, the difference of the force required when moving the back button 13 forward and the force required when moving backward is reduced, and operativity can be improved more.

  Moreover, in the cutter knife 1 of this embodiment, it is preferable that the size of the rear button 13 is smaller, and according to this, when operating the front button 17, the rear button 13 is erroneously moved. Can be prevented.

  Here, for example, the indwelling mechanism 9 can be configured to have a leaf spring that is elastically engaged with the fitting recess 3e of the holder 3, and in this case, the indwelling mechanism 9 is downsized with a sliding body with a simpler configuration. A cutter knife can be obtained.

  In addition, the detention mechanism 9 can be a screwing mechanism. In this case, for example, the screw portion is rotated and screwed, and the tip is brought into contact with the bottom surface 3a of the holder 3 so that the main sliding body is detained in the holder. be able to. In this case, the indwelling is released by rotating the screw portion in the direction opposite to the screwing direction.

  Further, in the cutter knife 1 of the present embodiment, from the viewpoint of reducing the overall length of the slider, the length in the front-rear direction in which the main sliding body 5 and the sub-sliding body 7 overlap in the vertical direction is the entire slider. Is preferably 1/2 or more of the length of the slider, and more preferably 3/4 or more of the total length of the slider.

  Thus, according to the present invention, it is possible to provide a quick-back type cutter knife that can reduce the length of the entire slider to reduce the size of the cutter body and improve the operability.

DESCRIPTION OF SYMBOLS 1 Cutter knife 3 Holder 3a Bottom wall 3b Side wall 3c, 3d Flange 3e Groove 5 Main sliding body 7 Sub sliding body 9 Placement mechanism 11 Back slider (main part)
12 Compression coil spring 13 Back button (rear operation part)
15 Front slider (base)
16 Connection protrusion 17 Front button (front operation part)
21 Tension coil spring (elastic member)
23 Locking body 25 Compression coil spring 27a, 27b Sliding surface

Claims (1)

A holder for accommodating the cutter blade,
A main sliding body attached to the holder so as to be movable back and forth;
An indwelling mechanism for indwelling the main sliding body in the holder;
A sub-sliding body that is attached to the main sliding body so as to be movable back and forth, and that connects the cutter blade;
An elastic member connected to the main sliding body and the sub-sliding body and biasing the sub-sliding body backward when the sub-sliding body is moved forward with respect to the main sliding body;
A cutter knife, wherein the main sliding body and the sub-sliding body are arranged so as to overlap in the vertical direction.

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