JP6754246B2 - Knife device and safety device - Google Patents

Description

The present invention relates to a knife device for cutting an object and the like, and a safety device provided in the knife device.

Generally, cutting tools such as cutters and knives are used to cut wiring and piping materials such as cables, power lines, conduits, and flexible pipes.

For example, Patent Document 1 discloses a cutter for wiring materials. The wiring material cutter (1) is used in electrical installation work, etc., and peels off the insulating coating (23) of the cable (21) made of the coated insulated wire as the wiring material, and also removes the cut surface (24) of the cable (21). It is a tool that can be polished. The wiring material cutter (1) has a blade (2) provided with a cutting edge (3) for peeling an insulating coating (23) made of vinyl resin or the like, and a handle made of synthetic resin or rubber that can be grasped by hand. It is composed of 4) and. The blade (2) protrudes unfoldably from the handle (4). The reference numerals of Patent Document 1 are shown in parentheses.

Japanese Patent No. 5037298

However, in a conventional cutting tool such as Patent Document 1, since the cutting edge of the blade is always exposed, there is a risk of being injured by touching the cutting edge when carrying around. That is, the problem with conventional cutting tools is that safety is not sufficiently considered. On the other hand, it is common practice to attach / detach a cap or the like to the blade, but it is considered that workability is lowered in consideration of the loss of the cap and the trouble of attaching / detaching the cap. Therefore, there is a demand for a cutting tool with improved work safety without sacrificing its workability.

An object of the present invention is to provide a knife device that is safe and easy to use, and a safety device that enhances the work safety of a knife (cutting tool).

The knife device according to claim 1 includes a blade body extending from the base end to the tip end along the longitudinal direction.
It has a covering portion that covers at least the tip of the blade, is slidably supported by the blade along the longitudinal direction, and has a tip covering position that covers the tip of the blade with the covering portion, and from the covering portion. A cover body configured to be movable between the blade tip and the protruding tip exposed position is provided.
When the cover body is located at the tip covering position, the cover body moves to the first posture in which movement of the cover body is restricted to the tip exposed position and to the tip exposed position of the cover body. It is characterized in that it can be mutually displaced to the allowed second posture, and the cover body is displaced from the first posture to the second posture by pressing the cover body toward the blade body side. ..

The knife device according to claim 2 is the knife device according to claim 1, wherein the cover body comes into contact with the tip of the blade body to the exposed position of the tip of the cover body in the first posture. It is characterized in that a regulated contact portion for restricting the movement of the blade is formed.

The knife device according to claim 3 is the knife device according to claim 2, wherein the cover body is provided with a through-hole through which the tip of the blade can pass, and is adjacent to the through-hole. The regulation contact portion is formed, and the regulation contact portion is formed.
When the cover body is in the first posture, the regulation contact portion is positioned so as to face the tip of the blade body, and when the cover body is in the second posture, the through hole is the blade body. It is characterized in that it is located facing the tip.

The knife device according to claim 4 maintains the cover body in the first posture in order to keep the cover body at the tip covering position in the knife device according to any one of claims 1 to 3. It is characterized by being provided with maintenance means.

The knife device according to claim 5 is the knife device according to claim 4, wherein the maintenance means acts so as to bring the cover body closer to or away from one side surface of the blade body. Is maintained in the first posture.

The knife device according to claim 6 is the knife device according to claim 5, wherein the maintenance means is arranged on a side wall of the cover body, and a magnetized portion capable of magnetizing one side surface of the blade body is provided. It is characterized by being prepared.

The knife device according to claim 7 is the knife device according to any one of claims 1 to 6, wherein the covering portion of the cover body includes a proximal end side portion that covers the proximal end side of the blade body. It is characterized by having a tip side portion that covers the tip end of the blade body, and a window portion that exposes the cutting edge of the blade body between the base end side portion and the tip end side portion.

The knife device according to claim 8 is the knife device according to claim 7, wherein the window portion partially exposes the cutting edge with a width capable of cutting a conduit.
The base end of the cover body and the base end of the blade body are separated so as to form a stroke amount of the slide movement of the cover body.

The knife device according to claim 9 is the knife device according to any one of claims 1 to 8 , wherein the cover body prevents the cover body from coming off from the tip of the blade body. It is characterized in that a stopping means is provided.

The knife device according to claim 10 is the knife device according to any one of claims 1 to 9 , further comprising an urging means for urging the cover body toward the tip end side of the blade body. It is a feature.

The safety device according to claim 11 is a safety device that is externally supported by a knife having a blade that extends from the base end to the tip end along the longitudinal direction.
A cover body having a covering portion that covers at least the tip of the blade body and a support portion that slides along the longitudinal direction to internally support the blade body is provided.
The cover body can move between the tip covering position where the blade tip is covered by the covering portion and the tip exposed position where the blade tip protrudes from the covering portion while the knife is internally supported. Consists of
When the cover body is located at the tip covering position, the cover body is placed in a first posture in which movement of the cover body to the tip exposed position is restricted, and to the tip exposed position of the cover body. It is characterized in that the cover body can be reciprocally displaced to a second posture in which movement is permitted, and the cover body is displaced from the first posture to the second posture by pressing the cover body toward the blade body side. And.

According to the knife device according to claim 1, the cover body is slidably supported by the blade body, and the covering portion of the cover body can cover at least the tip of the blade body. The cover body is configured to be movable between a tip covering position where the tip of the blade is covered with a covering portion and an exposed tip position where the tip of the blade protrudes from the covering portion. Then, when the cover body is located at the tip covering position in the first posture, the movement to the tip exposed position of the cover body is restricted. That is, when the cover body takes the first posture, the state in which the tip of the blade body is covered and protected by the cover body is maintained. As a result, when carrying the knife device, it is possible to prevent an injury caused by the tip of the blade. On the other hand, by pressing the cover body toward the blade body, the cover body is displaced from the first posture to the second posture. When the cover body is located at the tip covering position in the second posture, movement to the tip exposed position of the cover body is allowed. That is, the cover body can be easily switched from the first posture to the second posture by the pressing operation of the cover body. Then, by sliding the cover body in the second posture toward the base end side of the blade body, the tip of the blade body can be exposed from the cover body and can be quickly and easily changed to a form that can be used for cutting work. Therefore, the knife device of the present invention enhances work safety without sacrificing its workability.

According to the knife device according to claim 2, in addition to the effect of the invention of claim 1, the slide of the cover body is restricted by a simple structure by the contact between the regulated contact portion of the cover body and the tip of the blade body. can do.

According to the third aspect of the invention, in addition to the effect of the invention of the second aspect, the tip of the blade is moved forward relative to the cover body through the opening of the cover body in the second posture. As a result, the tip of the blade can be exposed. The regulated contact portion is located on the cover body in the first posture so as to face the tip of the blade, and the through-hole is located on the cover in the second posture so as to face the tip of the blade (regulated contact). By forming the regulation contact portion adjacent to the through hole so that the portion does not face the tip of the blade body), the slide of the cover body can be regulated with a simple structure.

According to the knife device according to claim 4, in addition to the effect of the invention according to any one of claims 1 to 3, the cover body is maintained in the first posture by the maintenance means, and the cover body is kept in the tip covering position. It is possible. That is, the state in which the tip of the blade is covered with the cover can be stably maintained, and the tip of the blade can be prevented from unexpectedly protruding.

According to the knife device according to claim 5, in addition to the effect of the invention of claim 4, the cover body is first by urging the cover body so as to be close to or separated from one side surface of the blade body. Maintained in posture. Then, by pressing the cover body against one or the other side surface of the blade body against this urging force, the cover body can be easily displaced to the second posture.

According to the knife device according to claim 6, in addition to the effect of the invention of claim 5, the side wall of the cover body is attracted to one side surface of the blade body by the magnetic force of the magnetized portion, so that the cover body is first. It is maintained in the posture of 1. Then, by pressing the side wall of the cover body against the other side surface of the blade body against this magnetic attraction, the blade body and the magnetically attached portion are separated, and the cover body is easily displaced to the second posture. Can be made to.

According to the knife device according to claim 7, in addition to the effect of the invention according to any one of claims 1 to 6, the tip end side portion and the proximal end side portion of the covering portion cover the proximal end side together with the tip of the blade. As a result, the cutting edge can be protected more safely. Since the cutting edge is exposed between the base end side portion and the tip end side portion of the covering portion via the window portion, even when the cover body is arranged at the tip covering position, the cutting edge is exposed through the window portion. The subject can be safely disconnected.

According to the knife device according to claim 8, in addition to the effect of the invention of claim 7, it is possible to cut the conduit by the cutting edge partially exposed from the window portion. Further, since the base end of the cover body and the base end of the blade body are separated from each other, the sliding movement of the cover body is not hindered by the base end side portion of the covering portion. Therefore, it is possible to safely cut the conduit while the tip end end side and the base end end side are covered with the cover body.

According to the knife device of one embodiment of the present invention , the cover body is slidably supported by the blade body, and the covering portion of the cover body can cover at least the tip of the blade body. The cover body is configured to be movable with a predetermined stroke amount between the tip covering position where the tip of the blade is covered by the covering portion and the exposed tip position where the tip of the blade protrudes from the covering portion. Therefore, by sliding the cover body toward the base end side of the blade body within a predetermined stroke amount range, the tip of the blade body is exposed from the cover body and the form can be quickly and easily changed to a form that can be used for cutting work. be able to. Further, at the tip covering position of the cover body, a part of the cutting edge of the blade body is exposed between the covering portion and the base end of the blade body, so that the target is cut without exposing the tip of the blade body. Is possible. Therefore, the knife device of the present invention enhances work safety without sacrificing its workability.

According to a further form of the knife device of the present invention, in addition to the effects of the above invention, the cover body can be safely fastened to the tip covering position by the restraining means. On the other hand, in order to move the tip of the blade body to the exposed tip position, the cover body can be slidably moved by operating the restraint releasing means. That is, since it is possible to prevent the cover body from unexpectedly moving and exposing the tip of the blade body by operating the restraining means and the restraining releasing means, it is possible to exhibit higher safety.

According to the knife device according to claim 9 , in addition to the effect of the invention according to any one of claims 1 to 8 , the cover body is prevented from being detached from the tip of the blade body by the retaining means.

According to the knife device according to claim 10 , in addition to the effect of the invention according to any one of claims 1 to 9 , the cover body is positioned at the tip exposed position by the urging means for urging the tip side of the blade body. The cover body to be covered can be automatically moved to the tip covering position. This prevents the tip of the blade from remaining exposed and provides higher safety.

According to the safety device according to claim 11 , the cover body slidably supports the blade body of the knife by the support portion, and the covering portion of the cover body covers at least the tip of the blade body. The cover body is configured to be movable between the tip covering position where the tip of the blade is covered by the covering portion and the exposed tip position where the tip of the blade protrudes from the covering portion while the knife is internally supported. .. Then, when the cover body is located at the tip covering position in the first posture, the movement to the tip exposed position of the cover body is restricted. That is, when the cover body takes the first posture, the state in which the tip of the blade body is covered and protected by the cover body is maintained. As a result, the safety device prevents injuries caused by the tip of the blade when carrying the knife. On the other hand, by pressing the cover body toward the blade body, the cover body is displaced from the first posture to the second posture. When the cover body is located at the tip covering position in the second posture, movement to the tip exposed position of the cover body is allowed. That is, the cover body can be easily switched from the first posture to the second posture by the pressing operation of the cover body. Then, by sliding the cover body in the second posture toward the base end side of the blade body, the tip of the blade body can be exposed from the cover body and can be quickly and easily changed to a form that can be used for cutting work. Therefore, the safety device of the present invention enhances work safety without sacrificing workability of the knife.

An exploded perspective view of a knife device according to an embodiment of the present invention. (A) front view and (b) rear view of the knife of the knife device of the present invention. (A) A schematic perspective view seen from the front and (b) a schematic perspective view seen from the back of the cover body of the knife device of the present invention. (A) front view, (b) rear view, (c) plan view, (d) bottom view, (e) right side view, and (f) left side view of the cover body of FIG. (A) AA sectional view, (b) BB sectional view, and (c) CC sectional view of the cover body of FIG. (A) DD sectional view of the cover body of FIG. (A) A schematic perspective view seen from the front and (b) a schematic perspective view seen from the back surface of the knife device according to the embodiment of the present invention. (A) front view, (b) rear view, (c) plan view, and (d) bottom view of the knife device of FIG. 7. FIG. 7 is a side view of the knife device (a) in which the cover body is in the first posture, and (b) a side view in which the cover body is in the second posture. 8 (a) EE sectional view, (b) FF sectional view, and (c) GG sectional view of the knife device of FIG. (A) HH sectional view of the cover body of FIG. In the knife device of FIG. 7, (a) a schematic perspective view seen from the front and (b) a schematic perspective view seen from the back of the knife device in which the cover body is moved to the tip exposed position. (A) front view and (b) side view of the knife device of FIG. 13 (a) I-I cross-sectional view, (b) JJ cross-sectional view, and (c) KK cross-sectional view of the knife device of FIG. FIG. 13 is a sectional view taken along line LL of the knife device of FIG. The schematic diagram which showed the process of cutting a conduit using the knife device of one Embodiment of this invention. (A) Side view and cross-sectional view of the cover body of the modified example of the present invention in which the cover body takes the first posture, and (b) Side view and cross-sectional view of the cover body in the second posture. (A) Side view and cross-sectional view of the cover body of the modified example of the present invention in which the cover body takes the first posture, and (b) Side view and cross-sectional view of the cover body in the second posture.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The shapes of the figures referred to in the following description are conceptual diagrams or schematic views for explaining suitable shape dimensions, and the dimensional ratios and the like do not always match the actual dimensional ratios. That is, the present invention is not limited to the dimensional ratio in the drawings.

FIG. 1 is an exploded perspective view of the knife device 100 according to the embodiment of the present invention. As shown in FIG. 1, the knife device 100 includes a knife 110 and a cover body 130 as a safety device movably attached to the blade body 111 of the knife 110. Hereinafter, each component of the knife device 100 will be described in detail with reference to FIGS. 2 to 5.

2 (a) and 2 (b) are a front view and a rear view of the knife 110, which is a component of the knife device 100 of the present embodiment. As shown in FIG. 2, the knife 110 includes a longitudinal handle 119 and a flat blade 111 extending from the handle 119. The handle 119 has a predetermined length and thickness so that the user can easily grip it, and has irregularities on its upper side surface and lower side surface. The blade body 111 extends in the longitudinal direction from the base end 113 to the tip end (cutting edge 114), and is joined to the handle 119 at the base end 113. In the present embodiment, as shown in FIG. 11, the end pieces of the blade 111 are embedded and joined inside the handle 119, but in the present specification, the "base end of the blade" is exposed from the handle 119. It means the base end of the part that is being used.

The blade 111 of the knife 110 has a predetermined length and width. Further, the blade 111 is made of a magnetic metal (steel material in this embodiment). A sharp cutting edge (or edge) 112 for cutting an object extends along the longitudinal direction at the lower end edge of the blade 111. The cutting edge 112 extends from the vicinity of the base end 113 to the tip end. The tip edge of the blade 111 is inclined so as to protrude toward the lower end side, so that a sharp cutting edge 114 is formed at the tip of the blade 111. The cutting edge 114 is a sharp point capable of cutting or piercing an object. Further, a blade-attached inclined portion 116 for joining the blade edge 112 is formed from substantially the center of the blade body 111 to the lower end edge. The blade-attached inclined portion 116 has a tapered shape so that the thickness of the blade body 111 continuously decreases downward in the width direction. That is, the blade-attached inclined portion 116 forms inclined surfaces inclined from the plane on which the blade 111 extends on both side surfaces of the blade 111.

Further, as shown in FIG. 2A, a scale is displayed near the peak (upper end edge) on one side surface of the blade 111. The user can easily determine the length to cut the target by reading the scale. As shown in FIG. 2B, a guide groove 115 is recessed in the vicinity of the peak (upper end edge) on the other side surface of the blade 111. The guide groove 115 extends linearly from the vicinity of the base end 113 toward the tip end side along the longitudinal direction, and terminates near the tip end. The guide groove 115 is capable of accommodating the shaft of the screw 13 6 b of the support portion 13 6 of the cover body 130 to be described later, the width of the guide groove 115 is substantially equal to the shaft diameter of the screws 13 6 b. In other words, the guide groove 115 serves to guide the linear sliding movement relative to the blade body 111 of the cover body 130 through the support 13 6. The guide groove 115 also functions as a retaining means for preventing the cover body 130 from coming out of the knife 110 in cooperation with the support portion 136.

Next, the cover body 130 will be described with reference to FIGS. 3 to 6. The cover body 130 is configured as a safety device that is externally supported by the blade body 111 of the knife 110. In other words, the safety device of the present invention comprises a cover body 130.

The cover body 130 includes a hollow main body for arranging the blade body 111 through the inside, and a support portion (a part of the retaining means) 136 for internally (inserting) supporting the knife 110 in the cover body 130. A magnetically attached portion (maintenance means) 137 for magnetizing the cover body 130 on the side surface of the blade body 111, and an operation unit 138 operated to displace the cover body 130 with respect to the blade body 111. A urging means 139 for urging the cover body 130 to the tip end side of the blade body 111 is provided. In the present embodiment, the cover body 130 is made of synthetic resin, but may be formed of other materials such as metal.

As shown in FIG. 3, the main body of the cover body 130 is a thin rectangular housing extending in the longitudinal direction. The cover body 130 connects a bottom wall 130a extending in a substantially horizontal direction, a pair of side walls 130b standing at a substantially right angle from the bottom wall 130a, and extending in a substantially vertical direction, and the pair of side walls 130b. It is also composed of a top wall 130c extending substantially parallel to the bottom wall 130a. The upper part of the cover body 130 is closed by the top wall 130c. On the other hand, the end face on the distal end side of the cover body 130 in the longitudinal direction is opened by the through hole 133, and the end face on the opposite proximal end side is opened by the proximal end side opening 135.

As shown in FIGS. 3 and 4, a semicircular window portion 132 open downward is notched in the pair of side walls 130b. That is, a pair of bottom walls 130a extend at two locations near the tip end side and the base end side in the longitudinal direction, and the cover body 130 opens downward through the window portion 132 between the pair of bottom walls 130a. doing. The window portion 132 has a width or diameter at which at least a part of the conduit P can be inserted (cut) (see FIG. 16).

That is, when the cover body 130 is externally supported by the blade body 111, the bottom wall 130a faces the blade edge 112 of the blade body 111, the pair of side walls 130b face both side surfaces of the blade body 111, and the top wall 130c Extends so as to face the peak of the blade 111. Then, on the bottom wall 130a and the side wall 130b, a covering portion 131 that covers the cutting edge 114 from the side and below together with a part of the cutting edge 112 of the blade body 111 is formed. The covering portion 131 is divided into a tip end side portion 131a and a proximal end side portion 131b with the window portion 132 interposed therebetween. In other words, the window portion 132 is located between the distal end side portion 131a and the proximal end side portion 131b.

Further, as shown in FIGS. 4 (e), 5 (c) and 6, a through-hole 133 through which the tip of the blade 111 can pass is provided on the end face on the tip end side of the cover body 130, and the through hole 133 is provided. A regulation contact portion 134 is formed adjacent to the mouth 133.

The through hole 133 has a width through which the blade 111 can pass, and is a slit extending between the bottom wall 130a and the top wall 130c, and is a combination of a substantially triangular lower portion and a substantially rectangular upper portion. Has a shape. In a side view, the lower portion adjacent to the bottom wall 130a has a substantially right-angled triangular shape (or a trapezoidal shape similar thereto). The acute-angled portion is located on the bottom wall 130a side, and the longer bottom side extends parallel to the side wall 130b. That is, the lower portion of the through port 133 is unevenly arranged on one side wall 130b side. In other words, a substantially right-angled triangular restricting contact portion 134 projects from the side wall 130b on the opposite side and closes a part of the rectangular passage port 133. On the other hand, in the upper portion, one side wall 130b (on the opposite side of the regulation contact portion 134) is slightly overhanging and inclined so that the upper end thereof is narrowed.

The regulation contact portion 134 is a substantially right-angled triangular overhang formed integrally with one side wall 130b and the bottom wall 130a at the tip of the cover body 130 so as to partially block the through hole 133 in the side view. , The overhang width is large toward the lower end side (see FIGS. 4 (e) and 5 (c)). Further, the regulation contact portion 134 is configured to have a substantially right-angled triangular shape so as to become wider toward the upper end side in the front view (see FIG. 6). That is, the regulated contact portion 134 faces the blade body 111 (cutting edge 114) in the longitudinal direction when the blade body 111 is biased toward one side wall 130b inside the cover body 130 (first posture). On the other hand, when the blade 111 is biased toward the other side wall 130b (second posture), it is configured so as not to face the blade 111 in the longitudinal direction.

As shown in FIGS. 4A and 5B, a support portion 136 is provided on the side wall 130b on one side (front side) of the cover body 130 as a part of the retaining means. The support portion 136 is composed of a screw hole 136a formed in the side wall 130b diagonally above the tip end side of the window portion 132, and a screw 136b attached to the screw hole 136a so that the shaft portion can penetrate the side wall 130b. Has been done. As described later in FIG. 10, bis 136b of the support portion 136 by entering the guide groove 115 of the narrow width of the blade 11 1, the cover body 130 is externally supported slidably and retaining preventing blade 11 1 To.

As shown in FIGS. 4 (a) and 5 (b), a magnetized portion 137 is provided as a maintenance means on the side wall 130b on one side (front side) of the cover body 130. The magnetized portion 137 is composed of a holding case 137a formed near the lower end of the outer surface of the side wall 130b on the base end side of the window portion 132, and a magnet 137b housed and held in the holding case 137a. The holding case 137a is a hollow hemispherical outer shell, and is joined to the side wall 130b with the magnet 137b included. That is, the magnet 137b is integrally coupled to the side wall 130b of the cover body 130. In the present embodiment, the magnet 137b is composed of a permanent magnet having a magnetic force capable of magnetizing the blade 111 arranged inside the cover 130 via the side wall 130b.

As shown in FIGS. 4B, 4C, and 4E, the side wall 130b on the other side (rear side) of the cover body 130 is provided with an operation unit 138 for the user to operate. The operating portion 138 is an arc-shaped ridge, which is projected from a part of the proximal edge of the side wall 130b. The operation unit 138 has a convex shape that allows the user's finger to be easily caught. That is, the operation unit 138 assists the user in pressing the cover body 130 and assists the user in sliding the cover body 130 in the longitudinal direction.

As shown in FIG. 6, near the upper end of the cover body 130, an urging means 139 for urging the cover body 130 toward the tip end side of the blade body 111 is provided. A partition wall 130d extends substantially parallel to the top wall 130c near the upper end inside the cover body 130. The partition wall 130d is opened at a substantially central portion thereof and is divided back and forth. A space for accommodating the urging means 139 is defined between the top wall 130c and the partition wall 130d. The accommodation space for the urging means 139 is closed on the longitudinal end side (left side in FIG. 6) of the cover body 130 and opened on the proximal end side (right side in FIG. 6). The urging means 139 is composed of a spring 139a that is stretchably arranged in the accommodation space of the cover body 130 and a rod-shaped long member 139b that is coupled to one end (base end side end portion) of the spring 139a. There is. Due to the expansion and contraction movement of the spring 139a, the long member 139b can be moved backward inside the cover body 130 and can be projected and moved toward the base end side of the cover body 130. The protruding end of the long member 139b is bent downward so as to engage with the tip end surface of the handle 119 of the knife 110 to form the claw portion 139d. Further, the long member 139b has a stepped portion 139c that bulges downward at the end portion on the tip end side of the cover body 130. The step portion 139c is housed in an opening that divides the partition wall 130d, and is arranged so as to be engaged with the facing end faces of the partition wall 130d. That is, the range of motion of the long member 139b is determined by the opening width between the partition walls 130d. That is, as the spring 139a expands and contracts, the long member 139b can move within a predetermined range along the longitudinal direction. Since the spring 139a is always held in a contracted state from its natural length, it is always urged in the direction in which the long member 139b is projected.

Based on the above description of each component, the configuration of the knife device 100 of the present embodiment will be described in more detail.

In the knife device 100 of the present embodiment, as shown in FIG. 7, the cover body 130 is externally supported by the blade body 111 of the knife 110. Specifically, the screw 136b of the support portion 136 is housed in the guide groove 115 of the blade body 111 (see FIG. 10B). The tip of the shaft portion of the screw 136b projects inward of the guide groove 115 to the extent that it does not come into pressure contact with the bottom surface of the guide groove 115. As a result, the shaft portion of the screw 136b can freely move relative to the guide groove 115 having a predetermined length along the longitudinal direction, but the movement of the screw 136b does not separate from the guide groove 115. Limited to only within. Further, by locking the screw 136b to the end edge on the tip end side of the guide groove 115, the screw 136b is separated from the guide groove 115, and the cover body 130 is prevented from falling out from the tip end of the blade body 111. .. In other words, the support portion 136 and the guide groove 115 cooperate to form a retaining means. That is, the cover body 130 is supported by the blade body 111 in a sliding and retaining manner along the longitudinal direction by the support portion 136 and the guide groove 115. The cover body 130 is configured to be movable between the tip covering position where the covering portion 131 covers the tip 114 of the cutting edge 112 and the tip exposed position where the tip 114 of the cutting edge 112 protrudes from the covering portion 131. ing.

As shown in FIG. 8, the cover body 130 is arranged at the tip covering position where the covering portion 131 covers the tip 114 of the cutting edge 112, and the state is maintained. That is, since the tip edge of the cover body 130 is located in front of the cutting edge 114 of the knife 110, the cutting edge 114 is covered from the side by the side wall 130b and is safely protected. Specifically, the tip of the cutting edge 112 is covered with the tip end side portion 131a of the covering portion 131, and the proximal end side portion of the cutting edge 112 is coated with the proximal end side portion 131b of the covering portion 131. On the other hand, a part of the blade edge 112 and a part of the side surface of the blade 111 is exposed downward and sideways from the semicircular window portion 132. The cutting edge 112 exposed from the window portion 132 is located at a position retracted (upward) from the bottom wall 130a of the cover body 130. The exposed width of the cutting edge 112 via the window portion 132 is preferably set so that the conduit P (see FIG. 16) can be cut. Further, the base end of the cover body 130 and the base end 113 (tip surface of the handle 119) of the blade body 111 are separated so as to form a stroke amount (range of motion) of the slide movement of the cover body 130. In other words, the cover body 130 can be retracted with respect to the blade body 111 until its base end abuts on the tip surface of the handle 119. In the present embodiment, the range of motion of the long member 139b of the urging means 139 corresponds to the stroke amount.

As shown in FIG. 11, in the knife device 100, the spring 139a of the urging means 139 is in the fully extended state, and the protruding end of the long member 139b is the handle 119 of the knife 110 due to the further elastic recovery force. The tip surface is pressed. That is, the urging means 139 maintains (or urges) the cover body 130 at the tip covering position where the covering portion 131 (tip side portion 131a) is located on the tip side of the cutting edge 114. Then, although the cover body 130 is pressed toward the tip end side, the screw 136b is locked to the end edge of the guide groove 115 on the tip end side, so that the cover body 130 is prevented from falling out from the tip end of the blade body 111. ing.

Further, as shown in FIG. 10A, the magnetized portion 137 is magnetized on the side surface of the blade 111, and the inner surface of one side wall 130b is inclined along the bladed inclined portion 116. That is, the cover body 130 takes the first posture by arranging the blade body 111 at a position biased toward one side wall 130b in the internal space thereof. In this first posture, as shown in FIGS. 10 and 11, since the regulated contact portion 134 is located facing the cutting edge 114, when the cover body 130 moves to the proximal end side, the regulated contact portion 134 is in regulated contact. The portion 134 and the cutting edge 114 engage (contact) with each other, and the blade 111 locks the cover 130. In this way, the cover body 130 is restricted from moving relative to the proximal end side of the blade body 111. In other words, in the first posture, the movement of the cover body 130 from the tip covering position to the tip exposed position is restricted. Then, the first posture of the cover body 130 is maintained by the traction force due to the magnetic force of the magnetized portion 137. That is, the magnetized portion 137 functions as a maintenance means for maintaining the cover body 130 in the first posture in order to keep the cover body 130 at the tip covering position.

On the other hand, in order to release the maintenance means and make the cover body 130 slidable, the user may press the cover body 130 from the side surface (preferably the operation unit 138). In particular, as shown in FIG. 9B, the cover body 130 is tilted so as to separate the magnetized portion 137 from the side surface of the blade body 111 with the screw 136b as the rotation axis, and the posture of the cover body 130 is set to the first position. Displace from the posture of 1 to the second posture. In the second posture, since the cutting edge 114 faces the through- hole 133 while avoiding the regulation contact portion 134, the blade 111 can pass through the through- hole 133. As a result, the cover body 130 in the second posture can slide and move toward the proximal end side. Then, the cover body 130 is moved forward by operating the cover body 130 via the operation unit 138 so that the tip of the blade body 111 is relatively forwardly moved from the cover body 130 through the through hole 133 of the cover body 130. It can be moved to the exposed position to expose the cutting edge 114.

Subsequently, the knife device 100 in which the cutting edge 114 protrudes from the covering portion 131 and the cover body 130 is in the tip exposed position will be described. This form may be selected when cutting or piercing the subject at the cutting edge 114.

As shown in FIGS. 12 and 13 (a), the cover body 130 is located on the proximal end side in a state where the blade body 111 has passed through the through hole 133 of the cover body 130, so that the blade edge is aligned with the cutting edge 114 of the blade body 111. The tip portion of 112 protrudes from the tip edge (covered portion 131) of the cover body 130 and is exposed to the outside.

More specifically, the cover body 130 slides toward the base end side of the blade body 111 in a state where the screw 136b of the support portion 136 is housed in the guide groove 115 (see FIG. 14B), and the spring of the urging means 139. 139a is contracting (see FIG. 15). As shown in FIG. 15, in the state where the cutting edge 114 protrudes to the maximum (that is, the spring 139a contracts to the maximum), the claw portion 139d at the protruding end of the long member 139b of the urging means 139 is the base of the partition wall 130d. Along with contacting the end face on the end side, the stepped portion 139c on the tip side of the long member 139 b comes into contact with the end face on the tip side of the partition wall 130d. When the cover body 130 is in the tip exposed position in this way, the spring 139a is greatly elastically contracted, and the cover body 130 is urged to return to the tip side by the urging means 139.

Further, as shown in FIG. 13B, the cover body 130 is inclined to the side opposite to the first posture with respect to the blade body 111, and takes a second posture. Specifically, as shown in FIG. 14A, the magnetized portion 137 is separated from the side surface of the blade 111, and the inner surface of the side wall 130b on the other side (opposite side of the magnetized portion 137) is along the bladed inclined portion 116. Is tilted. That is, the cover body 130 takes a second posture by arranging the blade body 111 at a position biased toward the other side wall 130b in the internal space thereof. In this second position, inclined blade 111 on the opposite side of the regulatory contact portion 134 is disposed at the restricting position which has passed through the through hole 133 without interfering with the contact portion 134 (or passable position) ing. As a result, the cover body 130 is allowed to move relative to the blade body 111 in the longitudinal direction. Then, as shown in FIG. 14C, the side surface of the blade 111 passing through the through hole 133 and the side surface of the regulation contact portion 134 are in contact with each other or close to each other. That is, even if the blade 111 is pulled by the magnetized portion 137, the side surface of the blade 111 is locked to the side surface of the regulated contact portion 134, so that the cover body 130 is restricted from tilting to the opposite side. That is, in a state where the blade 111 has passed through the through hole 133, the regulation contact portion 134 restricts the cover body 130 from being displaced to the first posture, and the second posture is maintained.

In this way, when the cutting edge 114 protrudes from the cover body 130, the blade body 111 and the cover body 130 are relatively slidable, and the cover body 130 is maintained at the tip exposed position by the urging means 139. It is configured to move naturally to the tip covering position without any need. That is, in the knife device 100 of the present embodiment, the user holds the cover body 130 by hand to maintain the tip exposed position, and the exposed cutting edge 114 can cut and / or pierce the target.

On the other hand, in order to return the cover body 130 from the tip exposed position to the tip covering position, the user releases the cover body 130 (or loosens the force for holding the cover body 130), and the urging means 139 The cover body 130 slides over the tip of the blade body 111 due to the elastic recovery force, and the cover body 130 is automatically displaced from the second posture to the first posture by the magnetic traction force of the magnetically attached portion 137. In particular, when the blade body 111 is separated from the through hole 133 due to the advancement of the cover body 130 and the blade body 111 is separated from the regulation contact portion 134, the cover body 130 is placed in the second posture due to the magnetic traction force of the magnetically attached portion 137. Naturally returns to the first posture. That is, when the user releases his / her hand from the cover body 130, the knife device 100 can be easily returned to the original form shown in FIG. 7 (a safe form in which the cutting edge 114 is covered).

Subsequently, with reference to FIG. 16, a method of safely cutting the conduit P using the knife device 100 of the present embodiment will be described. When there is no workbench such as a desk at the work site, it is common practice for the operator to place the conduit P on the thigh and cut it with a cutter or knife. In such a case, with the conventional cutting tool, there is a risk that the cutting edge of the blade that cuts the conduit bites into the thigh due to excessive momentum at the time of cutting, and the operator is seriously injured. In the present embodiment, the conduit P can be safely cut even on the thigh by effectively using the cutting edge 112 exposed from the window portion 132. The conduit P illustrated here is a general wavy flexible tube.

Specifically, first, the conduit P is placed on the thigh, and while gripping the handle 119 of the knife device 100, the cutting edge 112 exposed from the window 132 is brought closer to the conduit P (FIG. 16 (a). )reference). Next, the cutting edge 112 is strongly pressed against the conduit P so as to insert the conduit P into the window portion 132. Then, as shown in FIG. 16B, the cutting edge 112 is pushed into the conduit P with a strong force until the conduit P comes into contact with the edge of the window portion 132. At this time, since the cutting edge 114 is covered with the cover body 130 and the cutting edge 112 is retracted upward from the cover body 130 (bottom wall 130a), the user rarely injures the thigh or the like with the knife 110. Absent. Then, as shown in FIG. 16C, the conduit P can be completely cut by operating the conduit P or the knife 110 so as to rotate the conduit P with respect to the cutting edge 112. In this rotation step, since the edge of the window portion 132 is arcuate, the conduit P can rotate smoothly with respect to the cutting edge 112.

As a second use of the knife apparatus 100 of the present embodiment is a method using a base of the cutting edge 112 of the blade 11 1. Specifically, when the cover body 130 is in the tip covering position, the cutting edge 112 exposed between the base end side portion 131b of the cover body 130 and the tip of the handle 119 is used to cut, tear, and cover the cable. Work such as stripping of material can be performed safely and easily. For example, a cable suitable for this work includes a VVF (vinyl insulated vinyl sheath cable flat type) cable.

Needless to say, the knife device (and safety device) of the present invention is not limited by the above-mentioned usage. When it is necessary to use the cutting edge 114 of the knife 110, the knife device 100 is used so that the cover body 130 is slid to the exposed tip position.

Hereinafter, the operation and effect of the knife device 100 of the embodiment according to the present invention will be described.

According to the knife device 100 of the present embodiment, the cover body 130 as a safety device is slidably supported by the blade body 111 of the knife 110, and the covering portion 131 of the cover body 130 can cover the cutting edge 114. The cover body 130 is configured to be movable between a tip covering position where the covering portion 131 covers the cutting edge 114 and a tip exposed position where the cutting edge 114 protrudes from the covering portion 131. When the cover body 130 is located at the tip covering position in the first posture, the cutting edge 114 and the regulation contact portion 134 are arranged to face each other in the longitudinal direction, so that the cover body 130 can be moved to the tip exposed position. Be regulated. Further, when the maintenance means (magnetically attached portion 137) maintains the cover body 130 in the first posture and the cover body 130 takes the first posture, the cutting edge 114 is covered and protected by the cover body 130. Is kept safe. Further, it is possible to safely cut an object such as a conduit P by using the cutting edge 112 exposed through the window portion 132 of the cover body 130. As a result, it is possible to prevent an injury caused by the tip of the cutting edge 112 when carrying the knife device 100 or cutting an object.

On the other hand, by pressing the cover body 130 toward the blade body 111, the maintenance by the maintenance means is released, and the cover body 130 is displaced from the first posture to the second posture. When the cover body 130 is located at the tip covering position in the second posture, movement to the tip exposed position of the cover body 130 is allowed. That is, the cover body 130 can be easily switched from the first posture to the second posture by the pressing operation of the cover body 130. Then, by sliding the cover body 130 in the second posture toward the base end side of the blade body 111, the cutting edge 114 can be exposed from the cover body 130 and quickly and easily changed to a form that can be used for cutting work. it can. Further, since the cover body 130 is urged to the tip covering position by the urging means 139, the cover body 130 automatically returns to the tip covering position when the hand is released from the cover body 130, and the cutting edge 114 is safe by the cover body 130. Protected by.

For example, in a product in which a conventional cap protects the cutting edge, there is a risk that the cap may be troublesome to attach or detach or the cap may be lost. On the other hand, in the knife device 100 of the present embodiment, the cutting edge 114 can be easily exposed and covered by pressing and sliding the cover body 130, so that the knife device 100 is easier to use than the conventional one. It is a pursuit of.

Therefore, the knife device 100 of the present embodiment enhances work safety without sacrificing its workability.

[Modification example]
The present invention is not limited to the above embodiment, and various modifications can be taken. Hereinafter, modifications of the present invention will be described. In each modification, the components having the last two digits in common among the components indicated by the three digits have the same or similar characteristics unless otherwise explained, and some of the description thereof will be omitted.

(1) The knife device 100 of the above embodiment is provided with a retaining means 136, a maintaining means magnetically attached portion 137, and an urging means 139, but the present invention is not limited to this, and a part of each means. Alternatively, all may be omitted.

(2) In the knife device 100 of the above embodiment, the window portion 132 is formed on the cover body 130, but the present invention is not limited to this, and the window portion 132 may be omitted. In this case, when the cover body is in the tip covering position, the portion exposed to the outside of the cutting edge is reduced, so that higher safety can be exhibited. Then, when cutting the target, it is essential to move the cover body to the tip exposed position. Further, the shape of the through hole and the regulated contact portion of the present invention is not limited to the above embodiment. That is, the through hole may have at least a width and a length through which the cutting edge can pass, and the shape thereof can be arbitrarily selected. Further, the shape of the regulated contact portion may be arbitrarily selected as long as it can lock at least a part of the blade body when the cover body is in the first posture. For example, the regulated contact portion may come into contact with the blade from the side, and the movement of the blade may be restricted by a high frictional force.

(3) In the knife device 100 of the above embodiment, the cover body 130 is formed in a housing shape that covers the side surface, the bottom surface, and the top surface of the blade body 111 of the knife 110, but the present invention is not limited thereto. That is, the "covered portion" of the present invention may cover the tip (cutting edge) of the cutting edge from at least the side or the lower side in order to reduce the risk of injury to the user due to the cutting edge. For example, in the present invention, the top wall of the cover body may be omitted, the window portion may be made larger, or the cover body may be formed in a short strip shape capable of covering only the tip of the blade body.

(4) In the knife device 100 of the above embodiment, a magnetically attached portion 137 for pulling a blade body 111 which is a magnetic metal is used as a maintenance means, but the present invention is not limited to this. That is, the maintenance means can be selected from various means as long as it can be urged (acted) to maintain the cover body in the first posture.

For example, the knife device 200 shown in FIG. 17 includes maintenance means 237 utilizing the repulsive force of a magnet. The maintenance means 237 is embedded in a hollow holding case 237a formed on the outer surface of the side wall 230b of the cover body 230, a first magnet 237b housed and held inside the holding case 237a, and a side surface of the blade body 211. It is equipped with a second magnet 237c. As shown in FIG. 17A, when the cover body 230 is in the tip covering position, the first magnet 237b and the second magnet 237c are arranged so as to repel each other. Then, the repulsive force between the first magnet 237b and the second magnet 237c acts (biases) so that the one side wall 230b (where the maintenance means is formed) of the cover body 230 is separated from the side surface of the blade body 211. )doing. As a result, the cover body 230 is maintained in the first posture. At this time, the regulation contact portion 234 faces the cutting edge 214 of the blade body 211, and the sliding movement of the cover body 230 toward the proximal end side is restricted. Then, as shown in FIG. 17B, when the user presses the cover body 230 from the side, the first magnet 237b and the second magnet 237c come close to each other against the repulsive force, and the cover body 230 Is displaced to the second posture. In this second posture, since the blade body 211 is positioned so as to be able to pass through the through hole 233 in the longitudinal direction, the cover body 230 can freely move to the tip exposed position.

For example, the knife device 300 shown in FIG. 18 includes maintenance means 337 that utilizes the elastic force of the elastic member. Maintaining means 337 is provided with a hollow holding case 337a formed on the side wall 330b outer surface of the cover body 330, a housing and retained elastic body 337b in a state of being elastically contracted in the interior of the holding case 337 a. As shown in FIG. 18A, when the cover body 330 is in the tip covering position, the elastic body 337b acts on the side surface of the blade body 311 to hold the blade body 311 on one side wall 330b (where the maintenance means is formed). It is urging to move away from. As a result, the cover body 330 is maintained in the first posture. At this time, the regulation contact portion 334 faces the cutting edge 314 of the blade body 311 and the sliding movement of the cover body 330 toward the proximal end side is restricted. Then, as shown in FIG. 18B, when the user presses the cover body 330 from the side, the elastic body 337 b contracts, and one side wall 330 b approaches the side surface of the blade 311 facing the blade body 311. The cover body 330 is displaced to the second posture. In this second posture, since the blade body 311 is positioned so as to be able to pass through the through hole 333 in the longitudinal direction, the cover body 330 can be moved to the tip exposed position.

(5) In the knife device of the present invention, it is sufficient that the cover body slides between the tip covering position and the tip exposed position and the tip of the blade can be covered at the tip covering position, and the knife device 100 of the above embodiment It does not have to have all the configurations. For example, the technical scope of the present invention may also include a form in which the cover body does not tilt to the first posture and the second posture. In addition, the knife device has a restraining means for fastening the cover body at the tip covering position in place of the regulated contact portion or in addition to the regulated contact portion, and the cover body can be slidably moved by releasing the stationary by the restraining means. It may be provided with a means for releasing the restraint. For example, the restraining means and the restraining releasing means may be long screws used in place of the screws 136b of the above embodiment. That is, by strongly tightening the long screw until the tip of the shaft of the long screw comes into pressure contact with the bottom surface of the guide groove, the cover body can be safely stopped at the tip covering position as a stopping means. On the other hand, as a means for releasing the restraint, by loosening the long screw, the tip of the shaft of the long screw and the bottom surface of the guide groove can be separated from each other to release the restraint. Alternatively, the long member 139b of the above embodiment is made into a form that can be fixed and released at the maximum protruding position, and the long member is used as a stopping means and a stopping release means so as to stretch the long member to stop the cover body. May function as.

The present invention is not limited to the above-described embodiments and modifications, and can be implemented in various embodiments as long as it belongs to the technical scope of the present invention.

100 Knife device 110 Knife 111 Blade body 112 Blade tip 113 Base end 114 Cutting tip (blade tip tip)
115 Guide groove (retaining means)
116 Blade slope (side surface)
119 Handle 130 Cover body (safety device)
130a Bottom wall 130b Side wall 130c Top wall 130d Partition 131 Covering part 131a Tip side part 131b Base end side part 132 Window part 133 Passage port 134 Restricted contact part 135 Base end side opening 136 Support part (retaining means)
136a Screw hole 136b Screw 137 Magnetized part (maintenance means)
137a Holding case 137b Magnet 138 Operation part 139 Biasing means 139a Spring 139b Long member 139c Step part 139d Claw part

Claims (11)

A blade that extends from the base end to the tip along the longitudinal direction,
It has a covering portion that covers at least the tip of the blade, is slidably supported by the blade along the longitudinal direction, and has a tip covering position that covers the tip of the blade with the covering portion, and from the covering portion. A cover body configured to be movable between the blade tip and the protruding tip exposed position is provided.
When the cover body is located at the tip covering position, the cover body moves to the first posture in which movement of the cover body is restricted to the tip exposed position and to the tip exposed position of the cover body. It is characterized in that it can be mutually displaced to the allowed second posture, and the cover body is displaced from the first posture to the second posture by pressing the cover body toward the blade body side. Knife device. The claim is characterized in that the cover body is formed with a regulated contact portion that comes into contact with the tip of the blade and restricts the movement of the cover body in the first posture to the exposed tip position. Item 1. The knife device according to item 1. The cover body is provided with a passage through which the tip of the blade can pass, and the regulation contact portion is formed adjacent to the passage.
When the cover body is in the first posture, the regulation contact portion is positioned so as to face the tip of the blade body, and when the cover body is in the second posture, the through hole is the blade body. The knife device according to claim 2, wherein the knife device is located so as to face the tip. The knife device according to any one of claims 1 to 3, further comprising a maintenance means for maintaining the cover body in the first posture so as to keep the cover body in the tip covering position. The fourth aspect of claim 4, wherein the maintenance means maintains the cover body in the first posture by acting so as to bring the cover body closer to or away from one side surface of the blade body. Knife device. The knife device according to claim 5, wherein the maintenance means is arranged on a side wall of the cover body and includes a magnetized portion capable of magnetizing one side surface of the blade body. The covering portion of the cover body is formed between the base end side portion covering the base end side of the blade body, the tip end side portion covering the tip end side of the blade body, and the base end side portion and the tip end side portion. The knife device according to any one of claims 1 to 6, further comprising a window portion that exposes the cutting edge of the body. The window portion partially exposes the cutting edge with a width capable of cutting the conduit.
The knife device according to claim 7, wherein the base end of the cover body and the base end of the blade body are separated so as to form a stroke amount of the slide movement of the cover body. The knife device according to any one of claims 1 to 8 , wherein the cover body is provided with a retaining means for preventing the cover body from coming off from the tip of the blade body. .. The knife device according to any one of claims 1 to 9 , further comprising an urging means for urging the cover body toward the tip end side of the blade body. A safety device that is externally supported by a knife having a blade that extends from the base end to the tip along the longitudinal direction.
A cover body having a covering portion that covers at least the tip of the blade body and a support portion that slides along the longitudinal direction to internally support the blade body is provided.
The cover body can move between the tip covering position where the blade tip is covered by the covering portion and the tip exposed position where the blade tip protrudes from the covering portion while the knife is internally supported. Consists of
When the cover body is located at the tip covering position, the cover body is placed in a first posture in which movement of the cover body to the tip exposed position is restricted, and to the tip exposed position of the cover body. It is characterized in that the cover body can be reciprocally displaced to a second posture in which movement is permitted, and the cover body is displaced from the first posture to the second posture by pressing the cover body toward the blade body side. Safety device.

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