TWM652185U - Knives improvement - Google Patents

Abstract

The new creation relates to a cutting tool capable of replacing blades. The cutting tool includes a holder and a sliding unit. The holder has a track, and the track is formed with a longitudinal opening in the longitudinal direction. The sliding unit is connected to the blade and is slidably held on the track. The track has steps that narrow the lateral width of the longitudinal opening. part, the step part is formed on the distal side and defines the normal sliding range of the sliding unit, and the bottom surface of the front end side of the step part is provided with a blade replacement recess. Moreover, the sliding unit includes a hook portion with a long plate portion, and a blade connecting convex portion is installed on the top of the long plate portion; the most front position of the slide rail is provided with a movable between the step collision position and the collision avoidance position. Step collision part.

Description

Tool improvements

The invention relates to a cutting tool, in particular to an improvement of a cutting tool with replaceable blades.

Traditionally, there have been a variety of knives that are slidable relative to the blade holder of the tool and are equipped with replaceable blades.

However, this type of cutter is generally configured to slide a slide block to the front end side to release the connection between the blade and the slide block, so that the blade can be replaced from the front end side. By replacing the blade from the front end side, it is easier to replace the blade from the rear end by sliding the slider to the hand side, as has been seen in knife blades disclosed in earlier literature.

However, in most of the knives disclosed in the patent documents, there is a folding blade, which moves the slider to the front end within the normal sliding range to protrude or retract from the front end of the holding member, so that the blade can be removed from the slide. Remove and replace the block.

Since the front end within the normal sliding range is the blade replacement position, even if the user does not intend to replace the blade, the slider will slide to the blade replacement position and the blade will fall off. In this way, if the blade accidentally falls off during use, It may cause injury to the user or other accidents.

Therefore, the present invention was proposed in view of such a problem, and its object is to provide a tool whose blade can be replaced from the front end side and which is an improved tool that does not come off from the sliding device against the user's intention.

According to the improvement of the new tool, unless the user intentionally moves it to the blade replacement position, the blade will not fall off from the sliding unit and is safe, which is the second purpose of the new tool.

In order to solve the above problems, an improvement of the new type of tool is a tool that can replace the blade from the front end side, and its longitudinal opening sliding part is formed in the length direction, and the sliding unit is connected to the blade and is slidably held by a rail, wherein The rail is formed with a step portion at the end of the normal sliding range, and the step portion narrows the blade. Defining the width of the longitudinal opening of the side, and the blade replacement recess provided on the bottom surface of the step portion on the tip side; the sliding unit includes a hook portion having a long plate portion protruding toward the end side and inserted into A connecting protrusion in the connecting hole of the blade on the top surface of the end of the long plate portion. When the sliding unit is located at the front end, the sliding unit collides with the step collision portion to prevent the sliding unit from sliding toward the far end side; when the sliding unit slides, the step collision portion moves to the collision avoidance position to avoid collision with the step portion. When the sliding unit further moves to the blade replacement position on the front end side, the front end of the long plate portion drops into the blade replacement recess, causing the connecting convex portion to separate from the blade, which is another purpose of the present invention.

In order to facilitate the review committee to have a further understanding of the purpose, structure, device, characteristics and functions of the present invention, the detailed description is as follows:

11: Knives

12: Folding blade type knife

15:Blade

15a:Connection hole

110: retainer

111: Retainer body

112:Orbit

113: Longitudinal opening folding blade

114:Sliding recess

114a: concave part

115:Stairway

116: Blade replacement concave part

117: Front end stopper

119: cover

120:Sliding unit

121: Slider body

121a: Blade end contact portion

121b:Blade connection protruding hole

122: Square tube convex part

122a: Spring horizontal rod exposed opening

123:Spring receiving part

124: Locking rod connection recess

125:Sliding knob

126: Spring pressing groove

127: Knob opening

130:Spring

131: Horizontal rod

132: Leaf spring part

135:Hook

136:Longboard department

137:Blade connecting convex part

138: Front lower surface claw

140:Lock lever

141:Frame Department

142: Slider body connecting convex part

143: Step collision part

144: Knob

160: retainer

161: Retainer body

162:Orbit

163: Longitudinal opening folding blade

165a: The first step

165b: step concave part

165c: The second step

165d:The third step

166: Blade replacement recess

170:Sliding unit

171: Slider body

172: Prismatic convex part

172a: First step collision part

172b: Internal thread

172c: Second step collision part

174: Lateral elastic spring part

175:Dial knob

175a: External thread

176:Pawl spring

180:Spring

185:Hook

186:Longboard Department

187:Blade connecting convex part

188: Front end lower surface claw

Figure 1 is a plan view of an improved first embodiment of the new tool according to the present invention.

Figure 2 is a vertical sectional view of an improved tool according to the present invention.

Figure 3 is a cross-sectional view taken along line AA in Figure 1 .

Figure 4 is an exploded perspective view of an improved first embodiment of the new tool according to the present invention.

Figure 5 is an exploded perspective view of the sliding unit according to the first improved embodiment of the new tool.

Figure 6(a) and Figure 6(b) are top views for explaining the blade replacement operation of the first embodiment of the improvement of the new type of tool.

Figures 7(a) and 7(b) are longitudinal sectional views for explaining the blade replacement operation of the first improved embodiment of the new tool.

Figure 8 is a plan view of an improved second embodiment of the new tool according to the present invention.

Figure 9 is a vertical cross-sectional view of an improved second embodiment of the new tool according to the present invention.

Fig. 10 is a cross-sectional view taken along line BB in Fig. 8.

Figure 11 is an exploded view of an improved second embodiment of the new tool according to the present invention. Perspective.

Figure 12 is an exploded perspective view of a sliding unit according to an improved second embodiment of the new tool.

Figure 13(a) and Figure 13(b) are top views for explaining the blade replacement operation of the second improved embodiment of the new type of tool.

Figures 14(a) and 14(b) are longitudinal sectional views for explaining the blade replacement operation of the second improved embodiment of the new type of tool.

(first embodiment)

An improved first embodiment of the new tool will be described below with reference to Figures 1 to 7. Figures 6 and 7 are diagrams for explaining the blade replacement operation. Figures 6(a) and 7(a) are for showing the state in which the sliding unit slides to the frontmost position. Figure 6(b) Figure 7(b) shows the blade replacement position.

In the first embodiment, a self-locking folding blade type cutter 11 that is automatically fixed at a predetermined pitch will be described. The tool 11 includes a blade 15 , a holder 110 , and a sliding unit 120 integrally connected with the blade 15 and slidably installed relative to the holder 110 .

The blade 15 has a connecting hole 15a at its root for connecting to the sliding unit 120. The holder 110 includes a holder body 111 made of resin, a rail 112 made of stainless steel, and a cover 119 detachably attached to the rear end of the holder body 111 .

The holder body 111 is an elongated member held by the user's hand, and a track 112 of the same elongated member is held inside the holder body 111 . The inner side of the rail 112 holds the sliding unit 120 slidably along the length direction, and the cross-sectional shape perpendicular to the length direction is generally a square bracket shape (C shape, U shape).

In the longitudinally extending longitudinal opening of the rail 112 , inwardly folded longitudinal opening edge portions 113 are formed on the left and right sides along the longitudinal direction to slidably hold the sliding unit 120 . The longitudinal opening folding edge portion 113 is provided with sliding recesses 114 in which a plurality of recesses 114a are formed at predetermined intervals along the longitudinal direction. The sliding recess 114 is used to temporarily fix the sliding position of the sliding unit 120 in an automatic locking manner.

On the front end side of the sliding recess 114 of the rail 112, a step portion 115 is provided. The step portion 115 can collide with the sliding unit 120 moving in the front end direction to prevent the sliding unit 120 from moving in the front end direction. Step portions 115 are installed at the left and right longitudinal opening folding edge portions 113 respectively, and are formed to protrude inward to reduce the lateral width of the longitudinal opening.

This step portion 115 defines the end of the normal sliding range of the sliding unit 120 and prevents the end of the blade 15 from protruding or retracting from the end of the holder 110 . The rear end of the normal sliding range on the hand side is defined by the cover 119, and the sliding unit 120 sliding toward the rear end collides with the cover 119 and stops.

On the lower surface of the rail 112, a blade replacement recess 116 is provided on the front end side of the step portion 115. In the blade replacement recess 116, the bottom surface of the rail 112 is one level lower than other parts. The blade replacement recess 116 passes through the rail The bottom surface of the channel 112 is recessed into a rectangular parallelepiped shape, but the blade replacement recessed portion 116 only needs to be able to insert the front end lower surface claw 138 of the hook portion 135 described later.

As shown in FIG. 2 , the sliding unit 120 includes a sliding knob 125 , a locking lever 140 , a slide body 121 , a spring 130 and a hook 135 from top to bottom. The slider body 121 has a substantially rectangular plate shape as a whole, and a rectangular parallelepiped-shaped square tube protrusion 122 protruding upward is provided in the center thereof. The inside of the square tube protrusion 122 forms a spring receiving portion 123 that can accommodate the spring 130 .

A locking lever connecting recess 124 for connecting the locking lever 140 is formed on the rear end side of the square tube convex portion 122 of the slider body 121 . In addition, spring horizontal rod exposure openings 122a are formed on both sides of the square tube convex portion 122 in the width direction. Through the spring horizontal rod exposure openings 122a, the horizontal rod portion 131 (to be described later) of the spring 130 provided inside is exposed to the upper surface side. . A blade connection protrusion hole 121b is formed in the end of the slider body 121 for allowing a blade connection projection 137 (to be described later) to pass therethrough.

The slide knob 125 is a hollow rectangular parallelepiped member with an open lower surface, and is arranged to cover the upper portion of the square tube convex portion 122 of the slider body 121 . The sliding knob 125 is slidably connected to the slider body 121 so as to be able to slide a very small distance in the longitudinal direction in the front and rear direction. The claw (not shown) of the sliding knob 125 is locked so that it cannot easily fall off from the square tube protrusion 122 .

A spring pressing groove 126 is provided in the center of the lower inner side of the main body of the sliding knob 125. The spring pressing groove 126 has a vertical cross section parallel to the length direction. There is a generally U-shaped shape that is concave downward to push the spring 130 downward.

A square knob opening 127 is provided on the upper surface of the front end side of the slide knob 125 , and the knob 144 of the lock lever 140 described later penetrates the knob opening 127 and projects upward.

The spring 130 includes a horizontal rod portion 131 that extends horizontally in a horizontal direction orthogonal to the length direction, and is viewed from the front end (cutting edge) side and the rear end (handle) side of the horizontal rod portion 131 before use. The oblique downward protrusion provides fixation of the leaf spring portion 132 .

The hook portion 135 includes: a long plate portion 136 extending in the length direction; a blade connection convex portion 137 provided on the upper surface of the front end portion of the long plate portion 136; and a lower surface formed on the front end portion of the long plate portion 136. The lower surface of the front end of the claw 138. The front end of the long plate portion 136 can clamp the spring 130 accommodated in the spring receiving portion 123, and its base end is connected and fixed to the slider body 121 from below.

The blade connection convex portion 137 is inserted into the connection hole 15 a of the blade 15 to connect the blade 15 and the sliding unit 120 so as to be slidable integrally. The long plate portion 136 is always pushed downward by the elastic force of the leaf spring portion 132 of the spring 130 , and the leaf spring portion 132 of the spring 130 serves as a second elastic portion in contact with the upper surface of the long plate portion 136 .

The lock lever 140 is a member for preventing or allowing the sliding unit 120 to slide to switch between the replacement position of the blade 15 located on the end side of the normal sliding range. The locking lever 140 has a generally rectangular frame shape, and It includes a frame part 141, a slider body connecting convex part 142, a step collision part 143 and a knob 144.

The slider body connection convex portion 142 is located on the hand side of the frame portion 141 and projects downward. When the sliding unit 120 is assembled, it is inserted into the locking lever connection recess 124 of the slider body 121, and the slider body 121 and the locking lever 140 are integrally connected and fixed.

The locking lever 140 is sandwiched between the sliding knob 125 and the slider body 121 , and the frame part 141 is assembled to the upper edge of the square tube protrusion 122 surrounding the slider body 121 .

The step collision part 143 and the knob 144 are located on the front end side of the frame part 141. When the operator presses the knob 144 located above with his finger or the like, the step collision part 143 located below moves toward the front end of the frame part 141 together with the knob 144. When the finger is released, the step collision part 143 and the knob 144 receive the elastic force of the frame part 141 of the first elastic body and rise to the original position.

When the sliding unit 120 is located at the front end of the rail 112, the step collision part 143 collides with the step part 115 of the rail 112 (step collision position) to restrict the sliding unit 120 from further moving to the front end side (as shown in Figure 6(a) and Figure 6 7(a) as shown in figure).

At this time, when the button 144 is pressed and the step collision part 143 retracts below the longitudinal opening folding edge part 113 of the track 112, the collision avoidance position is reached, and the collision between the step collision part 143 and the step part 115 can be avoided. The sliding unit 120 can be moved from the normal sliding front position to the front side. blade replacement position.

The structure of each member constituting the slide unit 120 has been described above, but when the slide unit 120 is assembled, the spring 130 accommodated in the spring receiving portion 123 of the slider body 121 is not attached to the hook portion 135 located on the lower side. The long plate portion 136 presses the leaf spring portion 132 back and forth against the top surface of the spring receiving portion 123 so that it is in a horizontal state.

Therefore, both ends of the horizontal rod portion 131 of the spring 130 are exposed from the spring horizontal rod exposure openings 122a formed on both sides of the square tube convex portion 122 of the slider body 121, so the blade always has elasticity. The leaf spring portion 132 is biased by an upward force in the assembled state.

When the cutter 11 is used and the sliding unit 120 slides relative to the holder 110, both ends of the horizontal rod portion 131 exposed from the spring horizontal rod exposure opening 122a are embedded in the recess 114a of the sliding recess 114 of the cutter 11, the sliding is restricted, and the sliding unit The sliding position of 120 is automatically fixed.

If you want to release the fixed position and slide again during the normal sliding process, you need to push the sliding knob 125 with your fingers to the tip side or the base side, which is the direction in which you want to slide. The slider body 121 and the spring pressing groove 126 contact the horizontal rod portion 131 of the spring 130 and abut against the elastic force of the leaf spring portion 132 to move the horizontal rod portion 131 downward.

When the horizontal rod portion 131 moves downward, it disengages from the recess 114a of the track 112 so that the sliding unit 120 can slide. When the sliding unit 120 slides to the desired sliding position and the finger stops pushing the sliding knob 125 At this time, the sliding knob 125 returns to its original position relative to the slider body 121, and the horizontal rod portion 131 of the spring 130 moves downward. Since it is no longer pushed, the upwardly biased horizontal rod portion 131 rises.

As a result, the horizontal rod portion 131 is inserted into the recessed portion 114a of the rail 112 again, the sliding is stopped, and the sliding position of the sliding unit 120 is fixed at the desired position again. If the sliding unit 120 continues to move to the end side, as mentioned above, the step collision part 143 of the locking lever 140 collides with the step part 115 installed near the end of the rail 112, and further moves to the end side, and the sliding unit 120 cannot move. (usually on the top of the slide).

Next, the operation of replacing the blade 15 will be explained. For replacement, it is usually necessary to move the sliding unit 120 from the sliding front position to the blade replacement position on the front side.

In order to move the ordinary slide further from the front end position to the front end side, as mentioned above, the step collision portion 143 moves from the step collision position to the collision avoidance position, and the step collision portion 143 of the lock lever 140 and the step portion 115 of the rail 112 do not collide. needs to be lifted. When the knob 144 of the locking lever 140 is pressed, the integrally formed step collision portion 143 also descends.

When the step collision part 143 drops below the longitudinal opening folding edge part 113 where the step part 115 is formed, and the collision therebetween is released, the sliding unit 120 can further move from the normal sliding end position to the end side. Therefore, when the sliding knob 125 is pushed forward with a finger, the sliding unit 120 moves further forward.

The sliding unit 120 moves from the front end position of the normal sliding range to the front end side. When the front end of the slider body 121 collides with the front end stopper 117 of the rail 112, it stops at the blade replacement position, and the front end side cannot move anymore.

As shown in FIGS. 6(b) and 7(b) , when the slide unit 120 moves to the tool replacement position, the front lower surface claw 138 of the hook 135 reaches the position of the blade replacement recess 116 . Since the upper surface of the long plate portion 136 of the hook portion 135 is in contact with the leaf spring portion 132 of the spring 130, when the front lower surface claw 138 reaches the blade replacement recess 116 and the lower portion is opened, the front lower surface claw 138 is subjected to the second elastic force The elastic force of the leaf spring portion 132 of the blade is pushed downward and dropped into the blade replacement recess 116 .

When the top end of the long plate portion 136 of the hook portion 135 descends, the blade connecting convex portion 137 also descends integrally and withdraws from the connecting hole 15 a of the blade 15 . As a result, the connection between the blade 15 and the sliding unit 120 is released, and the blade 15 can be withdrawn from the tip side.

Next, install the new blade 15. Insert the new blade 15 from the front end side of the rail 112 with the connecting hole 15 a side as the head until the connecting hole 15 a is located above the blade connecting protrusion 137 of the hook 135 .

As shown in the figure, above the blade connection convex portion 137, the slider body 121 is provided with a blade end contact portion 121a as a step for colliding with and positioning the base end portion of the blade 15 on the upper surface of the front end side. In this blade end contact portion 121a, the connection hole 15a is positioned.

When the connecting hole 15a of the blade 15 is located above the blade connecting protrusion 137 and the blade 15 is further pushed to the hand side, the blade 15 and the sliding unit 120 slide to the hand side, so that the front lower surface claw 138 is used for replacement. The blade is detached from the blade replacement recess 116 and rises.

That is, the blade connecting protrusion 137 is also raised and inserted into the connecting hole 15a, and the new blade 15 is connected to the sliding unit 120. When the blade 15 is pushed toward the hand, the sliding unit 120 generally advances to the sliding end position and returns to the normal sliding range.

As described above, according to the first embodiment, when the blade 15 is replaced from the tip side, simply moving the sliding unit 120 to the tip side does not disconnect the blade 15 and the sliding unit 120, that is, the blade 15 can be used. When the user operates the lock lever 140 to move the step collision portion 143 from the step collision position to the collision avoidance position, the blade 15 can be safely replaced.

Although the modified first embodiment of the new tool has been described above, the improved embodiment of the new tool is not limited to the above embodiment, and various modifications can be made without departing from the improved gist of the new tool.

For example, the shape, size, material, etc. constituting the tool can be appropriately changed. The components constituting the holder and the sliding unit may also be suitably formed integrally or divided into separate components.

In addition, in the first embodiment, the spring having a self-locking function functions as the second elastic portion that presses the front end portion of the hook portion downward. Yes, but the elastic force of the long plate portion can also be configured to urge the front end portion downward.

(Second Embodiment)

Next, an improved second embodiment of the new tool will be described with reference to Figures 8 to 14. Figures 13 and 14 are used to explain the replacement operation of the blade 15. Figures 13(a) and 14(a) show the state of the front end position of the slide rail; Figures 13(b) and 14( b) The picture shows the state of the blade replacement position.

In the second embodiment, a folding blade type cutter 12 in which the sliding position is fixed by a thumb screw will be described. In this embodiment, differences from the above-described first embodiment will mainly be described, and common components will be given the same component names and descriptions thereof will be omitted.

The folding blade type tool 12 includes a blade 15, a holder 160 and a sliding unit 170. The holder 160 includes a holder body 161 and a track 162 . The track 162 has a folded longitudinal opening edge portion 163 to hold the sliding unit 170 in the longitudinal direction.

The longitudinal opening extending in the longitudinal direction of the rail 162 has a substantially bracket-shaped (C-shaped, U-shaped) cross-section, and the longitudinal opening with a rearward folding edge holds the sliding unit 170 in a slidable manner. Longitudinal opening folding edge portions 163 are formed on the left and right sides in the longitudinal direction.

A first step portion 165a is formed on the front end side of the rail 162. The first step portion 165a is provided at the longitudinal opening folding edge portion 163 for colliding with the sliding unit 170 moving in the front end direction to prevent the sliding unit 170. Move in the front direction. The difference from the first embodiment is that the first step portion 165a is only formed on one side of the longitudinal opening folding edge portion 163 (as shown in Figure 8 upper side), and are formed to protrude inward to reduce the width of the longitudinal opening.

The top end of the normal sliding range of the sliding unit 170 is defined by the first step portion 165a. A step recess 165b formed from the middle of the rail 162 to a slight end side of the first step portion 165a is provided in the longitudinal opening folding edge portion 163 on the opposite side (lower side in Figure 8) of the first step portion 165a. The step recess 165b of the first step portion 165a is recessed outward to widen the width of the longitudinal opening.

The second step portion 165c protrudes inward from the front end side of the step recessed portion 165b, and prevents the sliding unit 170 that moves from the normal sliding range to the front end side from moving to the front end side. The third step portion 165d protrudes inward on the rear end side of the step recessed portion 165b. On the bottom surface of the rail 162, a blade replacement recess 166 is provided on the front end side of the step recess 165b.

As shown in FIG. 12 , the sliding unit 170 includes a dial knob 175 , a slider body 171 , a spring 180 and a hook 185 from top to bottom. The slider body 171 has a substantially rectangular plate shape as a whole, and has a prismatic convex portion 172 protruding upward from the center to the rear end.

The lateral width of the prismatic protrusion 172 perpendicular to the longitudinal direction is slightly shorter than the lateral width of the longitudinal opening of the track 162 . When the slider body 171 is slidably held on the rail 162 , only the prismatic protrusion 172 protrudes outwardly from the longitudinal opening of the rail 162 . The front end of the right side (the upper side in FIG. 8 ) of the prismatic convex portion 172 facing the front end side becomes the first step collision portion 172 a that collides with the first step portion 165 a at the normal sliding front end position.

The slider body 171 is provided with a lateral elastic spring portion 174 on one side of the left side facing the front end side. The lateral elastic spring portion 174 is a rod-shaped portion that protrudes laterally outward while extending generally along the length direction. It is installed with two lateral elastic spring parts 174 protruding forward from the side of the slider body 171 and a lateral elastic spring part 174 protruding rearward.

When the sliding unit 170 is slidably installed on the rail 162, the lateral elastic spring portion 174 contacts the left inner surface of the rail 162 and is pushed back toward the slider body 171 side from the protruding position. Therefore, by the elastic force of the lateral elastic spring part 174 of the first elastic part, the slider body 171 held in the track 162 is always located on the right side opposite to the side where the lateral elastic spring part 174 is installed.

As a result, even if the size of the rail 162 is slightly larger than the size of the slider body 171, there is a gap in the width direction of the slider body 171 installed in the rail 162, and the slider body 171 will not turn sideways. Since it is pushed to one side by the lateral elastic spring part 174, it can slide stably on the track 162.

Here, the total length direction of the prismatic convex portion 172 of the slider body 171 refers to the length from the third step portion 165d to the first step portion 165a (the length of the step recess 165b) in the length direction of the rail 162, And slightly shorter.

When the sliding unit 170 is located at a position other than the sliding front end, the two lateral side surfaces of the prismatic convex portion 172 of the slider body 171 are sandwiched between the longitudinal opening edge portions 163 on both sides of the sliding unit 170 . However, when it is at the extreme end position of sliding, the entire prismatic convex portion 172 is located next to the step recess 165b, and the prismatic convex portion 172 moves against the elastic body. The elastic force of the lateral elastic spring portion 174 enables movement to the step recessed portion 165b side (the left side when facing the front end side).

When the prismatic convex portion 172 is fitted into the stepped concave portion 165b, Collision between the first step collision portion 172a and the first step portion 165a of the prismatic convex portion 172 is avoided, and the rail 162 is exposed to the outside from the longitudinal opening of the step recess 165b so that the prismatic convex portion 172 can move further to the front end side Move.

When the sliding unit 170 normally moves from the sliding front end position to the front end side, the front end portion of the left side (lower side in FIG. 8 ) of the prismatic convex portion 172 collides with the second step portion 165 c of the sliding unit 170 . The front end side of the step recessed portion 165b is the blade replacement position, and the left front end of the prismatic convex portion 172 is the second step collision portion 172c.

Dial knob 175 has external threads 175a and detent spring 176. An internal thread 172 b into which the external thread 175 a is screwed is formed on the upper surface of the prismatic convex portion 172 of the slider body 171 . The dial knob 175 is connected to the slider body 171 by being screwed through a detent spring 176 .

The top end of the external thread 175a of the dial knob 175 protrudes toward the bottom surface of the sliding unit 170, and the top end of the external thread 175a contacts the bottom surface of the track 162, thereby allowing the sliding unit 170 to slide to a desired position.

The spring 180 is sandwiched between the upper slider body 171 and the lower hook portion 185, and one end of the spring 180 is connected to a spring connection recess (not shown) formed in the lower surface of the slider body 171. The spring 180 is a return spring and uses elastic force to bias the front end side of the hook portion 185 in contact with its lower surface downward.

The hook portion 185 includes: a long plate portion 186 extending in the length direction; a blade connection convex portion 187 provided on the upper surface of the front end portion of the long plate portion 186; and a lower surface formed on the front end portion of the long plate portion 186. the front end of Lower surface claw 188. The root end portion of the hook portion 185 is connected and fixed to the slider body 171 from below via the spring 180 .

The structure of the sliding unit 170 has been described above. Next, the replacement operation of the blade 15 will be described. In operation, first, the sliding unit 170 slides to the extreme end of the normal sliding range.

As shown in Figures 13(a) and 14(a), when the sliding unit 170 moves to the most advanced sliding position, the first stepped collision portion 172a of the prismatic convex portion 172 and the first stepped portion 165a of the rail 162 Stop by collision (step collision position). In addition, in order to move the slider body 171 to the front end side, the operator uses a finger or the like to move the slider body 171 laterally to the side opposite to the first step portion 165a against the lateral elastic force.

When the prismatic convex part 172 is inserted into the step recessed part 165b, it becomes a collision avoidance position and avoids the collision between the first step collision part 172a and the first step part 165a. In the collision avoidance position, the prismatic convex portion 172 can slide to the front end side, so when the prismatic convex portion 172 is pressed to the front end side with a finger, the sliding unit 170 further moves to the front end side.

The sliding unit 170 on the front end side moved to the front end position of the normal sliding range faces the front end side of the prismatic convex portion 172, and the second step collision portion 172 of the left front end corner collides with the second step portion 165c of the rail 162, and stops. In the blade change position and can no longer be moved to the tip side.

As shown in FIGS. 13(b) and 14(b) , when the sliding unit 170 moves to the blade replacement position, the front end lower surface claw 188 of the front end of the hook 185 reaches the position of the blade replacement recess 166 . Since the upper surface of the long plate portion 186 of the hook portion 185 comes into contact with the spring 180 as the second elastic portion, it is pushed downward. By applying force, the lower surface claw 188 of the front end portion reaches the blade replacement recess 166, and the lower portion is released. Then, the front end lower surface claw 188 is pushed downward and descends into the blade replacement recess 166 .

When the top end of the long plate portion 186 of the hook portion 185 descends, the blade connecting convex portion 187 also descends integrally and withdraws from the connecting hole 15 a of the blade 15 . As a result, the connection between the blade 15 and the sliding unit 170 is released, and the blade 15 can be pulled out from the tip side.

After replacing the new blade 15, push the sliding unit 170 toward the rear end to slide. When the rear end side of the prismatic convex portion 172 returns to a position in contact with the third step portion 165d, which is the rear end of the step recessed portion 165b, the first step collision portion 172a of the prismatic convex portion 172 comes into contact with the first step portion 65d.

Then, the slider body 171, which is urged toward the first step portion 165a on the right side of the front end by the lateral elastic spring portion 174, moves to the right, then exits the step recess 165b on the left side, and usually returns to the slider front edge position.

The second embodiment has been described above. According to this embodiment, the same effects as those of the first embodiment can be obtained.

The improved second embodiment of the new cutting tool of the present invention has been described above. Like the first embodiment, various modifications are possible. In addition, in the second embodiment, a spring is provided to push the tip of the hook downward, and the tip is pushed downward by the elastic force of the long plate portion of the hook.

To sum up, the improvement of this new type of tool can indeed improve the common deficiencies, but it has not been used publicly. It complies with the provisions of the patent law. It is indeed a virtue to be granted a patent.

The above are the preferred specific embodiments of the present invention. If Any changes made based on the concept of this new model and the resulting functional effects shall be stated within the scope of this new model if they do not exceed the spirit of the instructions and illustrations.

11: Knives

110: retainer

114:Sliding recess

114a: concave part

115:Stairway

119: cover

120:Sliding unit

131: Horizontal rod

137:Blade connecting convex part

140:Lock lever

143: Step collision part

Claims (5)

An improvement of a tool is a tool that can replace the blade from the front end side, which includes: a holder with a track that forms a longitudinal opening in the length direction; a sliding unit connected to a blade that can be The rail can freely keep sliding in the rail; wherein the rail has a front end side that can limit the sliding range of the sliding unit, and a step portion that narrows the width of the longitudinal opening; the bottom surface of the front end side of the rail is provided with a blade for replacement. The blade replacement recess of the blade; the sliding unit has a hook portion with a long plate portion protruding from the front end side, and a blade connection convex portion is provided on the front end surface of the long plate portion for inserting the blade In a connecting hole; the front end of the sliding unit has a step collision portion; when the sliding unit is located at the step collision position on the front end side of normal sliding, the step collision portion can collide with the step portion, To prevent it from sliding to the more front end side; when the sliding unit is far away from the step collision position, it can avoid collision with the step portion; when the sliding unit is in the front end side position of normal sliding, and the step collision portion moves When reaching the position to avoid collision with the step portion, the sliding unit can further move to the blade replacement position on the front end side; when the blade replacement concave portion descends, the blade connection convex portion also descends, and the release can be Connection between sliding unit and blade. In the improvement of the tool described in item 1 of the patent application, the sliding unit has a first elastic part, and the first elastic part pushes the step collision part to the front end of the track through the elastic force. The step collision position. As in the improvement of the tool described in item 1 of the patent application, the sliding unit further includes a second elastic part, and the second elastic part uses elastic force to push the hook part downward in the blade replacement recess. tip. The improvement of the tool as described in any one of items 1 to 3 of the patent application, wherein the track has longitudinal opening folding edge portions formed on the left and right sides of the longitudinal opening facing the end side, and the The step portion may be formed to protrude inward only at the folding edge portion of the longitudinal opening on one side, and an outwardly recessed step recess is formed on the other side facing the end side to expand the lateral width of the longitudinal opening, and the sliding unit constitutes It is possible to move into the step recess on the normal sliding end side. The improvement of the tool according to claim 4, wherein the longitudinal length of the step recess is slightly longer than the longitudinal length of the protrusion exposed to the outside from the longitudinal opening of the sliding unit.

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