TECHNICAL FIELD

The present invention relates to a combination scissors and cutter knife in which scissors are combined with a cutter knife.

BACKGROUND ART

Both scissors and a cutter knife have been widely used as office stationery, teaching materials for students, or sewing tools in industrial factories or at home. Such scissors and a cutter knife should be separately treated by users since their functions are different from each other although their usage, handlers and places of use are considerably intimate with each other. However, since conventional scissors and a conventional cutter knife are separately manufactured, users should usually change cutting instruments from scissors to a cutter knife or vice versa, depending upon their need, which causes lowering of a work efficiency.

Accordingly, various prior art devices in which scissors and a cutter knife are incorporated for the convenience of users have been proposed. In one of these prior art devices, a cutter knife unit having a replaceable blade is generally attached to one of scissor's blades, and a rotating pin for rotatably connecting both the scissor's blades with each other limits the mounting position of the cutter knife unit, which causes the cutter knife unit to be mounted short of the rotating pin on any of the scissor's blades. In this case, since a cutter knife housing accommodating a cutter knife is limited in length within the distance from the tip of the blade to the rotating pin, the

length of the cutter knife cannot be sufficiently secured. Moreover, the rotating pin disturbs the insertion and detachment of both the cutter knife and a slide knobl from the rear-end direction of the cutter knife housing in order to replace the old cutter knife by a new one. To overcome this problem, U.S. patent No. 5,430,9^0 discloses a combination scissors and cutter knife that a part of a cutter knife housing can be opened so that a cutter knife and a slide knob can be inserted into and separated from the cutter knife housing transversely to lengthwise direction of the cutter knife. However, such a replacement method of the cutter knife causes a comparatively complicated structure and inconveniences replacement of the cutter knife owing to a different replacement method from that of a conventional cutter knife.

DISCLOSURE OF THE INVENTION

To solve the above problem, it is an object of the present invention to provide a combination scissors and cutter knife facilitating replacement of a cutter knife blade in a comparatively simple structure. To accomplish the above object according to one aspect of the present invention, there is provided a combination scissors and cutter knife comprising: first and second scissor' s blades each having a holder on rear end thereof; a cutter knife blade; a slide knob which is connected with the cutter knife blade for a sliding operation of the cutter knife blade; a cutter knife housing which is fixed on the outer surface of the first scissor' s blade and contains the cutter knife blade to be slidably and lengthwise moved and having a front-end opening

for allowing the cutter knife blade to go in and out, a rear-end opening for allowing the cutter knife blade and the slide knob to go in and out, and a lengthwise opening for allowing the slide knob to be slidably and lengthwise moved; a rotating pin for rotatably connecting the both first and second scissor' s blades with each other within the length of the cutter knife housing; and locking means for opening or closing the rear-end opening in the cutter knife housing.

Here, it is preferable that the cutter knife housing includes an accommodation hole for accommodating a head portion of the rotating pin so that the head portion of the rotating pin does not disturb a sliding movement of the cutter knife blade.

It is also preferable that the first scissor's blade and the cutter knife housing are mutually combined by screws or by welding, or they are integrally made from a single material. It is preferable that the holder attached to the first scissor's blade is detachably connected to a rear-end portion of a first scissor's blade assembly by a fitting operation, in which case the locking means is a locker which is provided in the holder, in order to close the rear-end opening of the cutter knife housing. It is preferable that the holder has an accommodation opening for surrounding the rear-end portion of an assembly of the cutter knife housing and the first scissor's blade.

It is preferable that the locker may be inserted into the rear- end opening of the cutter knife housing. Otherwise, it is preferable that the locker may be detachably mounted on the holder.

It is preferable that a locking maintenance means can be further comprised to prevent the holder and the first scissor' s blade from

being detached from each other.

As being the case, the holder attached to the first scissor' s blade has an insertion portion which is compulsively fitted in the rear end opening of the cutter knife housing, by which the holder may be connected to the rear-end portion of the assembly of the cutter knife housing and the first scissor's blade. Alternatively, the holder attached to the first scissor's blade has an insertion portion which is inserted into the rear-end opening of the cutter knife housing, and a means for fixing the insertion portion by contacting and pressing the inner wall surface of the cutter knife housing.

It is preferable that the insertion portion fixing means comprises a screw hole formed on the insertion portion perpendicularly to the lengthwise direction of the cutter knife housing, and a rotating knob having a screw portion which is threadedly connected with the screw hole.

It is preferable that the holder is extended to the lengthwise direction of the first scissor's blade so that the cutter knife blade is not disturbed by the holder attached to the first scissor' s blade when the cutter knife blade goes in and out via the rear-end opening of the cutter knife housing, in which case the locking means may be a simple stopper which is detachably inserted into the rear-end opening of the cutter knife housing.

According to another aspect of the present invention, there is provided a combination scissors and cutter knife comprising: first and second scissor' s blades each having a holder on rear end thereof and which are rotatably connected with each other by a rotating pin; a cutter knife blade; a slide knob which is connected with the cutter

knife blade for a sliding operation of the cutter knife blade, a cutter knife housing which is fixed on the outer surface of the first scissor' s blade and contains the cutter knile blade to be shdablv and lengthwise moved and having a front-end opening for allowing the cutter knife blade and the slide knob to go in and out, and a lengthwise opening for allowing the slide knob to be slidably and lengthwise moved, and a front-end guide member which is detachably connected with the front-end opening ot the cutter knife housing, allowing the cutter knife to go in and out and preventing the slide knob from being detached from the front-end opening

BRIEF DESCRIPTION OF THE DRAWINGS

FIG 1 is a perspective view of a combination scissors and cutter knife according to one embodiment of the present invention FIG 2 is an exploded perspective view of the FIG 1 combination scissors and cutter knife

FIG 3 is an longitudinal section view showing the exploded state of an assembly of a cutter knife housing and a first scissor' s blade

FIG 4 is a horizontal section view showing the assembly of a cutter knife housing and a first scissor' s blade

FIG 5 is a hoπzontal section view showing another example of the assembly of a cutter knife housing and a first scissor' s blade

FIG 6 is a partial horizontal section view showing another example of a connection portion of the assembh of a cutter knife housing and a first scissor' s blade

FIGs 7 through 10 are hoπzontal section view s showing examples of a rotating pin, respectively

FIG. 11 is an exploded perspective view of another example of the connection structure between the assembly of a cutter knife housing and a first scissor's blade and the holder.

FIG. 12 is an exploded perspective view of still another example of the connection structure between the assembly of a cutter knife housing and a first scissor' s blade and the holder.

FIG. 13 is a vertical section view of the holder shown in FIG. 12.

FIGs. 14 and 15 are longitudinal section views showing still another example of the connection structure between the assembly of a cutter knife housing and a first scissor' s blade and the holder, respectively.

FIG. 16 is a front view showing yet another example of the connection structure between the assembly of a cutter knife housing and a first scissor' s blade and the holder. FIG. 17 is an exploded perspective view of a combination scissors and cutter knife according to another embodiment of the present invention.

FIG. 18 is a perspective view of the assembled state of a combination scissors and cutter knife according to still another embodiment of the present invention.

FIG. 19 is an exploded perspective view of the FIG. 18 combination scissors and cutter knife.

FIG. 20 is a horizontal section view of the rotating knob of FIG. 18. FIG. 21 is a horizontal section view of a modified rotating knob.

FIG. 22 is a perspective view of the assembled state of a combination scissors and cutter knife according to yet another

embodiment of the present invention.

FIG. 23 is an exploded perspective view of the FIG. 22 combination scissors and cutter knife.

FIG. 24 is a longitudinal section view of the front-end guide member of FIG. 22.

FIG. 25 is a partially exploded perspective view of a modified assembly of a cutter knife housing and a first scissor' s blade.

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The same or similar elements in the accompanying drawings are designated by the same reference numerals.

Referring to FIGs. 1 and 2, a combination scissors and cutter knife according to one embodiment of the present invention includes a pair of first and second scissor's blades 21 and 10. A cutter knife housing 30 is attached to the outer surface of the first scissor' s blade 21, to thereby form an assembly 20 of the cutter knife housing and the first scissor' s blade. The second scissor's blade 10 is comprised of a main body 11 on which an inclined cutter 12 is formed and a holder 13 which is integrally fixed to the rear-end portion of the main body 11, as in a pair of conventional scissors.

The first scissor' s blade 21 correspondingly assembled with the second scissor's blade 10 includes an inclined cutter 22. The cutter knife housing 30 attached to the outer surface of the first scissor' s blade 21 has a substantially same length as that of the first scissor' s blade 21, and is integrally fixed along the lengthwise direction of the

first scissor' s blade 21 by means of a plurality of screws 25. The cutter knife housing 30 has an elongated slit 31 formed along the lengthwise direction of the outer surface thereof. The cutter knife housing 30 forms an accommodating space therein for accommodating a cutter knife blade 35 so that the latter is slidably moved along the lengthwise direction. The cutter knife blade 35 is connected with a slide knob 37 via the slit 31 of the cutter knife housing 30, in which a connecting protrusion 38 of the slide knob 37 is inserted into a protrusion accommodating hole 36 formed in the rear-end portion of the cutter knife blade 35. Accordingly, a user can manipulate the slide knob 37 to move the cutter knife blade 35 in the lengthwise direction.

A front end opening 33 is formed in the front end portion of the cutter knife housing 30 to allow the front-end tip of the cutter knife blade 35 to go in and out therethrough. The front-end opening 33 narrows in thickness to prevent jogging of the cutter knife blade 35. Thus, a spacer 49 is interposed between the cutter knife housing 30 and the first scissor' s blade 21 to fill a clearance therebetween. The cutter knife housing 30 also has a rear-end opening 34 to allow an assembly of the cutter knife blade 35 and the slide knob 37 to go in and out therethrough.

A holder 40 is connected with the rear-end portion of the cutter knife housing and first scissor' s blade assembly 20. The holder 40 is fitted via an accommodating opening 43 for surrounding the cutter knife housing and first scissor' s blade assembly 20, along the lengthwise direction from the rear-end portion thereof at the state where the first scissor' s blade 21 and the cutter knife housing 30

have been integrally connected with each other. A stopper 41 formed in the accommodating opening 43 blocks the rear end opening 34 of the cutter knife housing 30. As can be seen from the drawings, the stopper 41 formed in the accommodating opening 43 of the holder 40 is formed to fit into the rear-end opening 34 of the cutter knife housing 30. Thus, the accommodating opening 43 of the holder 40 is fitted in the form of surrounding the assembly 20 of the first scissor' s blade 21 and the cutter knife housing 30, while the stopper 41 is inserted into the rear-end opening 34 of the cutter knife housing 30. As a result, the holder 40 is tightly connected with the first scissor's blade 21 and the cutter knife housing 30 to provide a sufficient rigidity during operation of the scissors. At the same time, since the stopper 41 blocks the rear-end opening 34 of the cutter knife housing 30, the cutter knife blade 35 and the slide knob 37 are prevented from coming out via the rear end opening 34 of the cutter knife housing 30.

Meanwhile, a horizontally protruded stop protrusion 42 is formed in the distal of an arm portion extended forwardly from the holder 40. The stop protrusion 42 is engaged in a stop hole 27 formed on the first scissor's blade 21 at the assembled state of the first scissor' s blade 21 and the cutter knife housing 30. Accordingly, the holder 40 is not easily detached from the first scissor' s blade 21. When the cutter knife blade 35 accommodated in the cutter knife housing 30 is replaced by another, the stop protrusion 42 is detached from the stop hole 27 and the holder 40 is pulled in the lengthwise direction of the cutter knife housing and first scissor's blade assembly 20. to thereby remove the holder 40 from the cutter knife housing and first scissor' s

blade assembly 20 and simultaneously open the rear- end opening 34 of the cutter knife housing 30 which has been blocked by the stopper 41. Then, the cutter knife blade 35 and the slide knob 37 are drawn out via the rear-end opening 34 to thereby allow a new cutter knife blade to be replaced with the existing cutter knife blade 35 and then are re- assembled together.

Instead of the stop protrusion 42 and the stop hole 27 provided to prevent the holder 40 and the first scissor's blade 21 from being detached, a stop hook or a knurling may be provided in the mutual contact surfaces. Meanwhile, a cutting slit 47 is formed in the ring portion of the holder 40, to thereby cut the blunt cutter knife blade 35.

The second scissor' s blade 10 and the first scissor's blade 21 are integrally and rotatably connected by means of a rotating pin 26. The rotating pin 26 is engaged with a pin hole 14 formed in the second scissor' s blade 10 via a pin hole 39 formed on the bottom of the cutter knife housing 30 and a pin hole 23 formed in the first scissor's blade 21. A flange is formed in the distal of the rotating pin 26 by a rivetting method at the state where the rotating pin 26 has been engaged with the pin holes 39, 23 and 14, to thereby prevent the first and second scissor's blades 21 and 10 from being detached from each other.

FIG. 3 is an longitudinal section view showing the exploded state of the assembly 20 of the first scissor' s blade 21 and the cutter knife housing 30. FIG. 4 is an enlarged horizontal section view showing the assembled state of the FIG. 3. As can be seen from the drawings, a plurality of connection holes 24 are formed in the first

scissor' s blade 21 and a plurality of threaded holes 32 are formed in the cutter knife housing 30 in correspondence to the connection holes 24. Thus, screws 25 are threadedly connected with the threaded holes 32 of the cutter knife housing 30 through the connection holes 24 of the first scissor's blade 21 to integrally connect both the first scissor' s blade 21 and the cutter knife housing 30. Here, to prevent the head portion of each screw 25 from being exposed at the outer surface of the first scissor's blade 21, each connection hole 24 of the first scissor' s blade 21 is counter-bored to accommodate the head portion of the screws 25.

The connection between the first scissor's blade 21 and the cutter knife housing 30 can be accomplished in various form. For example, instead of the screws 25 having the shape shown in FIG. 4, screws 25' having the head portion of a triangular section shape can be used as shown in FIG. 5, in which case the shape of a connection hole 24 ' is formed in correspondence to the head portion of the triangular section shape of the screws 25' . Also, as shown in FIG. 6, a first scissor's blade 21 ' and a cutter knife housing 30' can be integrally molded, in which case the first scissor' s blade 21 ' and the cutter knife housing 30' need not be assembled. Besides, a first scissor' s blade and a cutter knife housing which have been made of a respectively separate plate material may be connected by means of a bonding or a spot welding.

FIG. 7 is a horizontal section view showing the connection portion of the rotating pin 26. The cutter knife housing 30 and the first scissor' s blade 21 which are mutually connected have the pin holes 39 and 23 for passing through the rotating pin 26, respectively.

These pin holes 39 and 23 are counter-bored to accommodate the head portion of the rotating pin 26. Thus, the rotating pin 26 is not protruded from the bottom of the cutter knife housing 30, to thereby prevent the cutter knife blade 35 which is slidably moved in the cutter knife housing 30 from being disturbed by the head portion of the rotating pin 26.

FIG. 8 is another example of the FIG. 7 connection structure, in which the head portion of a rotating pin 26a has a triangular section shape and pin holes 23' and 39' have the corresponding shape to the head portion of the rotating pin 26a. FIG. 9 is still another example of the FIG. 7 connection structure, in which a rotating pin 26b does not pass through the cutter knife housing 30. Here, the rotating pin 26b is embedded in the first scissor' s blade 21 prior to mutually connecting the first scissor' s blade 21 and the cutter knife housing 30, and the free end portion of the exposed rotating pin 26b is engaged with the pin hole of the corresponding second scissor's blade 10 and then is rivetted as shown in FIG. 9. FIG. 10 shows yet another example of the FIG. 7 connection structure in which a rotating pin protrusion 26c is formed in the first scissor's blade 21 in advance and the protrusion 26c is engaged with the pin hole of the corresponding second scissor' s blade 10 and then is rivetted.

FIG. 11 is an exploded perspective view of another example of the connection structure between the assembly of a cutter knife housing and a first scissor' s blade and the holder. Here, an extension 29a is formed along the lengthwise direction of the first scissor's blade 21, and an accommodation groove 45a is formed in a holder 40a in correspondence to the extension 29a. When the

assembly of the first scissor' s blade 21 and the cutter knife housing 30 is mutually connected with the holder 40a, the extension 29a is inserted into the accommodation groove 45a of the holder 40a and the stop protrusion 42 is engaged with the stop hole 27. Here, a stopper 41a formed in the holder 40a is inserted into a rear-end opening 34a of the cutter knife housing 30 to block the rear-end opening 34a, in which case the extension 29a is inserted into the holder 40a to increase a connection strength.

FIG. 12 is an exploded perspective view of still another example of the connection structure between the assembly of a cutter knife housing and a first scissor's blade and the holder. FIG. 13 is a vertical section view of the holder 40b shown in FIG. 12. Here, a holder 40b is angularly transposed with respect to the lengthwise direction of the cutter knife housing and first scissor' s blade assembly 20, and the corresponding holder of the second scissor's blade 10 is angularly transposed likewisely. The connection structure of the holder 40b and the cutter knife housing and first scissor's blade assembly 20 is similar to that of FIG. 11, in which case a stopper 41b can be separated from the holder 40b. The stopper 41b tnay be inserted into an accommodation groove 46 formed in the holder 40b along the lengthwise direction thereof, to thereby block the rear-end opening 34 of the cutter knife housing 30 at the inserted state. In this case, when the cutter knife blade 35 is replaced by a new one, the stopper 41b is simply removed to thereby remove and insert the cutter knife blade 35 via a rear-end opening 34b of the cutter knife housing 30, without separating the holder 40b from the cutter knife housing and first scissor' s blade assembly 20.

FIGs. 14 through 16 show still another example of the connection structure between the assembly of a cutter knife housing and a first scissor's blade and the holder, respectively. FIGs. 14 and 15 are longitudinal section views and FIG. 16 is a front view thereof. In FIG. 14, a holder 40c is connected with an extension 29c of the first scissor' s blade 21 and is angularly transposed with respect to the lengthwise direction of the first scissor' s blade 21. Also, a stopper 41c for blocking a rear-end opening 34c of the cutter knife housing 30 is separately formed to thereby be inserted into and detached from the rear-end opening 34c. In this case, the holder 40c is angularly transposed to facilitate insertion and detachment of the stopper 41c and the cutter knife blade 35 with respect to the holder 40c.

In FIG. 15, a holder 40d is transposed in position in parallel with lengthwise direction of the first scissor's blade 21. Accordingly, a stopper 41 d for blocking a rear -end opening 34d of the cutter knife housing 30 and the cutter knife blade 35 can be inserted into and detached from the cutter knife housing 30 without being disturbed by the holder 40d. Although the holders 40c and 40d are angularly and positionally transposed at the co-plane with respect to the lengthwise direction of the cutter knife housing and first scissor' s blade assembly 20 in FIGs. 14 and 15, a holder 40e is transposed at the hetero-plane in case of FIG. 16. In this case, a stopper 41e for blocking a rear -end opening 34e of the cutter knife housing 30 and the cutter knife blade 35 can be inserted into and detached from the cutter knife housing 30 without being disturbed by the holder 40e.

FIG. 17 is an exploded perspective view of a combination scissors and cutter knife according to another embodiment of the present invention, which is generally similar to the above embodiment. In this embodiment, a holder 40f does not include the accommodation opening 43 surrounding the rear-end portion of the assembly of the first scissor's blade 21 and the cutter knife housing 30, and the stop protrusion 42 employed for preventing the detachment of the holder 40 and the first scissor's blade 21. The holder 42f in this embodiment is connected with the cutter knife housing and first scissor' s blade assembly 20 if a forwardly protruded stopper 41f is inserted into a rear-end opening 34f of the cutter knife housing 30. Here, the stopper 41f is designed in dimension so that it is compulsively fitted into the portion of the rear-end opening 34f of the cutter knife housing 30. Thus, the holder 40f is not easily detached in its lengthwise direction, to simultaneously prevent detachment of the cutter knife blade 35 and the slide knob 37 from the rear-end opening 34 f. When the cutter knife blade 35 and the slide knob 37 are removed to replace the cutter knife blade 35, and the holder 40f is pulled by a slightly strong force against the cutter knife housing and first scissor' s blade assembly 20, the stopper 41f is removed from the rear-end opening 34f. Then, the cutter knife blade 35 and the slide knob 37 can be taken out via the rear end opening 34f from which the stopper 4 If has been removed.

As described above, the combination scissors and cutter knife according to the present invention is not disturbed by a rotating pin or a holder in a simple structure and facilitates exchange of the cutter knife blade.

PTG. 18 is a perspective view of the assembled state of a cutter knife housing and first scissor' s blade assembly 120 and a holder 150 according to still another embodiment of the present invention. FIG. 19 is an exploded perspective view of the FIG. IS combination scissors and cutter knife. In this embodiment, the holder 150 is detachably fitted into the rear-end portion of a cutter knife housing 140, and includes an insertion portion 151 on which a screw hole 157 is formed. A rotating knob 170 which can be rotatably manipulated by a user has a screw portion 177 which is threadedly connected with the screw hole 157 of the insertion portion 151. Accordingly, the rotating knob 170 is connected with the insertion portion 151 at the state where the insertion portion 151 has been inserted into the rear-end opening of the cutter knife housing 140.

FIG. 20 shows the state where the rotating knob 170 is connected with the insertion portion 151 of FIG. 18. As shown in FIG. 20, if the screw portion 177 is tightly engaged with the screw hole 157 of the insertion portion 151 by manipulating the rotating knob 170, then the end portion of the screw portion 177 presses the inner wall surface of the cutter knife housing 140, to accordingly press the insertion portion 151 to contact the corresponding inner wall surface of the cutter knife housing 140.

In FIG. 20, an annular spring 160 is interposed between the rotating knob 170 and the insertion portion 151. A protrusion 163 is formed on one side of the annular spring 160. An accommodation hole 153 for accommodating the protrusion 163 is formed to fixedly maintain the annular spring 160 in the insertion portion 151. The central portion of the annular spring 160 is supported by a support

protrusion 155 which protrudes on the insertion portion 151 to thereby allow the opposing portion of the protrusion 163 to elastically contact the rotating knob 170. A protrusion 168 formed forwarding the rotating knob 170 is formed in the elastic contact ares, and a plurality of stoppers to be engaged with the protrusion 168 are provided in the rotating knob 170, to prevent free-rotation of the rotating knob 170. By the above constitution, the holder 150 can be easily attached to and detached from the cutter knife housing and first scissor' s blade assembly 120 by manipulating the rotating knob 170. A slide knob 135 and a cutter knife blade 145 can be easily removed from the rear end portion of the cutter knife housing 140 at the state where the holder 150 has been separated therefrom, to thereby facilitate the insertion and separation of the cutter knife blade 145 and tightly connect the holder 150 with the cutter knife housing and first scissor's blade assembly 120 to prevent rolling of the holder 150.

FIG. 21 is a horizontal section view showing the connection structure of a modified rotating knob in correspondence to FIG. 20. A connection member 180 is interposed between the insertion portion 151 and the rotating knob 170. The connection member 180 has a connection hole 187 through which the screw portion 177 of the rotating knob 170 is connected. If the rotating knob 170 is further made to rotate at the state where the screw portion 177 is connected with the connection hole 187, the end portion of the screw portion 177 presses the insertion portion 151 to thereby fix the insertion portion 151 to the bottom of the cutter knife housing 140.

FIG. 22 is a perspective view of the assembled state of a combination scissors and cutter knife according to yet another

embodiment of the present invention. FIG. 23 is an exploded perspective view of the FIG. 22 combination scissors and cutter knife. FIG. 24 is a longitudinal section view of the front- end guide member of FIG. 22. As can be seen from these drawings, the combination scissors and cutter knife in this embodiment includes a mutually acting first and second scissor's blades 221 and 210, in which a cutter knife housing 240 is attached to the first scissor 's blade 221. Holders 214 and 224 are fixed in the rear-end portions of both the scissor' s blades 210 and 221. The cutter knife housing 240 attached to the first scissor' s blade

221 includes an opening 241 along the lengthwise direction of the outer surface of the cutter knife housing 240, and forms an accommodation space for accommodating the cutter knife blade 245 which can be slidably moved along the lengthwise direction therein. The opening 241 is open in the front-end portion of the cutter knife housing 240 and is closed in the rear-end portion thereof. A slide knob 235 which is connected with the cutter knife blade 245 via the opening 241 can be moved along the lengthwise direction of the opening 241 of the cutter knife housing 240. In this case, when there is no front- end guide member 250 which blocks the front-end portion of the cutter knife housing 240, the slide knob 235 can be inserted into and removed from the cutter knife housing 240 via the front-end opening 243 of the cutter knife housing 240, together with the cutter knife blade 245. The front- end guide member 250 is detachably installed in the front- end opening 243 of the cutter knife housing 240. The front-end guide member 250 includes an insertion portion 253 which is

compulsively fitted into the front-end opening 243 and fixed therein, to be thereby integrally connected with the cutter knife housing 240. The front-end guide member 250 forms an inner space extended from the accommodating space of the cutter knife blade 245 formed in the cutter knife housing 240, to allow the end portion of the cutter knife blade 245 to go in and out. An opening 251 which is connected with the opening 241 of the cutter knife housing 240 is formed in the outer surface of the front-end guide member 250. The front-end guide member 250 includes a narrow -width portion 255 which narrows in width as it goes to the front-end portion thereof to prevent rolling of the cutter knife blade 245 during use of the cutter knife blade 245.

When the cutter knife blade 245 is separated from the cutter knife housing 240 to replace the existing knife blade with a new blade, the cutter knife blade 245 and the slide knob 235 are separated from the cutter knife housing and first scissor's blade assembly 220 via the front end opening 243 of the cutter knife housing 240, in which the front- end guide member 250 is compulsively separated from the cutter knife housing 240 by an external force and the slide knob 235 is slid and moved to the front end portion of the cutter knife housing 240. When the cutter knife blade 245 is assembled, a reverse procedure to the separation procedure follows. That is, the slide knob 235 is connected with the cutter knife blade 245, the slide knob 235 and the cutter knife blade 245 are inserted into the front-end portion of the cutter knife housing 240, and the front-end guide member 250 is connected with the cutter knife housing 240. As a result, the front-end guide member 250 can be inserted into and detached from the cutter knife housing 240 without having a

20

burdensome number of operations, to thereby facilitate exchange of the cutter knife blade 245.

FIG. 25 is a partially exploded perspective view of a modified assembly of a cutter knife housing and a first scissor's blade and a holder. Here, a front-end guide member 260 is inserted into the a cutter knife housing 240 via the front end opening 243, and has an inclined portion 263 having a generally wedge shape, to accordingly play a role of narrowing the width of the front- end opening 243 of the cutter knife housing 240. A stop protrusion 261 is formed on either side of the front- end guide member 260. A stop groove 265 is formed in the inner wall surface of the cutter knife housing 240 to be engaged with each stop protrusion 261, to accordingly tighten the connection of the front-end guide member 260. If the cutter knife blade 245 is moved toward the front-end guide member 260 by manipulation of the slide knob 235, the cutter knife blade 245 goes in and out via the front-end opening 243 which narrows when the front-end portion of the cutter knife blade 245 moves along the inclined portion 263. When the cutter knife blade 245 is replaced, the front-end guide member 260 is firstly separated by an external force and the slide knob 235 and the cutter knife blade 245 are separated via the front-end opening 243 of the cutter knife housing 240.

As described above, the front- end guide member in each embodiment is connected with the cutter knife housing 240 along the lengthwise direction thereof. As being the case, the front end guide member may be connected with the cutter knife housing 240 in the perpendicular direction with respect to the lengthwise direction.

INDUSTRIAL APPLICABILITY

The combination scissors and cutter knife according to the present invention can be applied in various places such as homes, offices, schools and sewing factories where a number of scissors and cutter knives are used.