CA2076453C - Cutter - Google Patents
CutterInfo
- Publication number
- CA2076453C CA2076453C CA 2076453 CA2076453A CA2076453C CA 2076453 C CA2076453 C CA 2076453C CA 2076453 CA2076453 CA 2076453 CA 2076453 A CA2076453 A CA 2076453A CA 2076453 C CA2076453 C CA 2076453C
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- CA
- Canada
- Prior art keywords
- blade
- handle
- slider
- cutting
- cutter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
A cutter includes a movable blade and a slider. The movement of the slider causes the blade to move between an extended cutting position and a retracted storage position. The slider includes one projection which frictional engages the blade for preventing its free rotation or movement during the cutting operation.
Description
2~!7~" 5~
C U '1"1'~; K
Background of the Invention Field of the Invention The present invention generally relates to a cutter. More particularly, it relates to a cutter having a blade which is slidably extendable to a protracted cutting position and a retracted storage position.
Description of the Prior Art The following conventional cutters are well known and exemplify the state of the art in the field. A rotary cutter has a disc shaped blade which rotatably and pivotally moves with respect to a stationary handle. A conventional cutter knife has a straight cutting edge. The cutting edge slidably protrudes to permit cutting and is retracted for storage.
The rotary cutter allows the rotational friction force to be adjusted, in order to improve the performance of the cutter. The United States patent No. 4,301,594 discloses one type of rotary cutters. The cutter has a slider arranged at one end section of a handle. A disc shaped blade is secured to the slider by means of a fastening device, at its center section. Consequently, an appropriate rotational friction force could be applied to the 2~7~;~53 disc blade so as to prevent a free, arbitrary rotation of the disc blade during the cutting operation.
However, when the fastening device is excessively tightened, the rotational friction force is significantly increased.
Consequently, the disc blade becomes hard to rotate. When the fastening device becomes loose, the rotational friction force is significantly decreased so that the disc blade starts to freely rotate. As a result, the adjustment of the fastening device becomes rather difficult. If the adjustment is improperly made, the cutting ability of the cutter decrease.
The Japanese Unexamined Utility Model Publication No. 61-54752 discloses a cutter knife which has a straight cutting edge. The cutter knife has a pair of grooves within its handle. The grooves communicate with an outer peripheral end of the elongated handle.
One of distal ends of the handle is opened. When a slider is moved along the grooves, the blade is caused to slide by the slider so that the cutting edge of the blade protrudes beyond the distal end of the handle, through the opening in the distal end of the handle.
When the blade is extended by the slider and touches the inner wall of the opening, the sliding ability of the blade significantly decreases. Therefore, it is necessary to create a relatively small gap between the inner wall of the opening and the blade. Consequently, the blade that can not be securely held 2~7~53 in position creates a swaying motion during the cutting operation. As a result, the cutting ability of the blade decreases.
Summary of the Invention It is therefore an object of the present invention to provide a cutter with a rotatable and slidable blade and a slider, for stable handling.
Another object of the present invention is to provide a cutter having a rotatable and slidable blade, such that the blade is securely supported during the cutting operation in order to increase the cutting ability of the cutter.
To achieve the foregoing and other objects there is provided a cutter which includes a handle and a disc blade. The blade can be protracted or retracted. A slider is connected to the blade and slidably supports the handle, and permits the blade to move between a cutting position and a storage position. A pressure applying device includes a cantilevered elastic projection formed on the slider to abut against the blade. The cantilevered projection abuts against the blade when the blade is in use.
In one aspect of the present invention, a disc blade is rotatably attached to the distal end of the handle. The distal end has a disc shape, generally proportioned to the disc blade. When the disc blade is extended to forward the cutting position, the cantilevered projection abuts against the inner surface of the disc blade and applies a rotational friction force to the disc blade.
In another aspect of the present invention, a blade which has a straight cutting edge that can be extended into a cutting position beyond the distal end of the handle. The cutting edge is retractable within the handle, for storage, when the cutter is not in used. The blade is pushed against the inner peripheral edge of the opening by means of the cantilevered projection, in order to avert the undesirable sway of the blade.
Therefore, in accordance with the present invention, there is provided a cutter comprising:
a handle including an elongated groove;
a blade having a first surface and a second surface, said first surface facing said handle, said blade being movable between a cutting position and a storage position;
slider means, connected to said blade and slidably supported by said handle and along said elongated groove, for selectively moving said blade between said cutting and storage positions and for holding said blade in said cutting and said storage posltlons;
said slider means including resisting means for frictionally resisting a free movement of said blade during a cutting operation, a base portion that is generally positioned in proximity of said first surface of said blade, and a positioning portion which extends from said base portion for securely~5 positioning the blade in one of said positions;
said handle including pressing means for pressing said resisting means against said first - 4a -surface of said blade when said blade is in said cutting position;
said resisting means including a resilient member which projects from the base portion toward said first surface of the blade and positioned such that said resilient member is forced toward said first surface of the blade when said blade is moved from said storage position to said cutting position;
wherein said blade has a generally disc shape and is rotatably mounted on said slider means, and wherein said handle includes a platform extended from an end of said handle and supporting the blade for rotation thereon.
Also in accordance with the present invention, there is provided a movable blade cutter comprising:
a handle;
a blade having a first surface and a second surface, the first surface facing the handle, said blade being movable between a cutting position and a storage position;
said handle including an elongated groove;
slider means being slidably movable within said elongated groove and connected to said blade,~5 and slidably supported by said handle, for switching the blade position between the cutting position and the storage position;
said slider means including resisting means for frictionally resisting a free movement of the~0 blade during a cutting operation;
said handle including pressing means for pressing the resisting means against said first surface of the blade in the cutting position; and a platform extending from an end of the~5 handle;
- 4b -wherein the blade is rotatably mounted on said slider means and is supported by said platform for rotation thereon.
Further in accordance with the present invention, there is provided a movable blade cutter comprising:
a handle;
a blade having a first surface and a second surface, the first surface facing the handle, said blade being movable between a cutting position and a storage position;
slider means, connected to said blade and slidably supported by said handle, for switching said ~ blade between said cutting position and said storage position;
said slider means including a base portion being generally positioned in proximity of said first surface of said blade, and a positioning portion extending from said base portion for securely positioning said blade in one of said positions;
said handle including an elongated groove, and said slider means being slidably movable within said elongated groove;
said elongated groove including a plurality of setting recesses, and said slider means including a plurality of projections engaging said setting recesses for causing said blade to be securely retained in one of said positions;
said slider means including resisting means for frictionally resisting a free movement of said blade during a cutting operation;
said resisting means including a resilient member for abutting said first surface when said blade is in said cutting position;
said handle including at least one tapered surface positioned adjacent said blade such that said resilient member contacts said tapered surface and is forced toward said blade when said blade is switched from said storage position to said cutting position;
wherein said blade has a generally disc shape and is rotatably mounted on said slider means, and wherein said handle further includes a platform extending from an end of said handle and supporting the blade for rotation thereon.
Brief Description of the Drawings Figure 1 is a plan view of a rotary disc blade cutter, showing the blade retracted according to a first embodiment of the present invention;
Figure 2 is a near plan view of the cutter of Figure l;
Figure 3 is an enlarged partially broken plan view of the rotary disc blade of Figure 1, illustrating a slider in engagement with a handle;
Figure 4 is a cross-sectional view of the cutter taken along line IV-IV in Figure 1;
2~?7~i~53 Figure 5 is a side view of the cutter showing the blade in a protracted position;
Figure 6 is a partially broken plan view of the cutter of Figure 5;
Figure 7 is a cross-sectional view of the cutter taken along line VII - VII in Figure 5;
Figure 8 is a side view of a cutter having a straight cutting edge shown protracted according to a second embodiment of the present invention; and Figure 9 is a cross-sectional side view taken along line IX - IX
in Figure 8.
Description of the Preferred Embodiments A preferred first embodiment of a rotary cutter according to the present invention, will now be described with reference to Figures 1 through 7.
As illustrated in Figure 1, the cutter includes a generally elongated handle which is made of synthetic resin. An elongated groove 2 guides a slider 3 along the front surface of the handle 1. An aperture B is formed in the handle 1, for hooking the 2~7~S3 cutter when it is not in use. When the slider 3 is manually slid, the slider 3 is guided by the inner peripheral edge of the groove 2 along length of the handle 1.
The distal end of the handle 1 includes an enlarged platform 4 which supports a disc blade 8. The platform 4 has a rear generally flat surface. One surface of the platform 4 is designated as an upper surface 4b, and engages the disc blade.
As shown in Figure 3, the upper surface 4b has a slot 5 and a bore 6. The slot 5 and the bore 6 are adjacent to each other, and are located along the sliding direction of the slider 3. The bore 6 is positioned closer to the peripheral edge of the platform 4. A relatively inclined tongue 7 is formed at the distal end of the slot 5. The distal end of the tongue 7 is most inclined than its proximal end, and is closer to the front surface 4b.
The disc blade 8 is rotatably supported on the front surface 4b, and has an orbicular peripheral cutting edge 8a. When the cutter is not in use, the disc blade 8 is retracted so that the cutting edge 8a is securely held within an arc shaped peripheral edge 4c of the platform 4. As shown in Figures 5 through 7, when the cutter is in use, a portion of the cutting edge 8a is caused to protrude beyond the peripheral edge 4c by the slider 3.
The slider 3 is made of a synthetic resin. As shown in Figure 4, the slider 3 is integrally formed with a generally thin 2~ 53 rectangularly shaped base 9, and a generally short finger grip 10. The base 9 is disposed on the rear surface of the platform 4 with the slider 3 placed in the groove 2. The finger grip 10 is easily accessible by the user. When the finger grip 10 is pressed, it is bent toward the rear surface direction. When the pressure is released, the elastic finger grip 10 returns to its original position.
A nut 11 engages the base 9, and is securely fastened to the central section of the disc blade 8, through the bore 6 of the platform 4. A spring washer 12 is mounted on the upper surface of the disc blade 8. A threaded bolt 13 is inserted in the spring washer 12, and the disc blade 8 is coupled to the nut 11.
Therefore, the disc blade 8 is securely fastened against the upper surface 4b by the spring washer 12. The disc blade 8 may rotate steadily around the axis of the nut 11.
A cantilevered elastic projection 14 extends from the base 9 of the slider 3, and projects outwardly toward the distal end of the disc blade 8. It is inserted into the slot 5 of the platform 4, and is disposed within the inner side of the disc blade 8. A tip 14a is used to apply pressure to the blade 8, is formed at the distal end of the cantilevered projection 14, and engages the tongue 7.
As shown in Figure 1, the finger grip 10 includes a pair of projections 15 for positioning the blade 8. A pair of recesses -- 2~~~53 16 and 17 engage the projections 15 for locking the blade into positlon .
As shown in Figures 1 though 4, when the cutter is not in use, the projections 15 of the finger grip 10 are inserted in the first recess 16, so that the orbicular peripheral cutting edge 8a of the disc blade 8 is retracted and is securely held within the arc shaped peripheral edge 4c of the platform 4. The tip 14a of the slider 3 is then disengaged from the tongue 7. Therefore, the tip 14a does not contact the disc blade 8.
When the cutter is in use, the finger grip 10 of the slider 3 is pushed forward so as to disengage the projections 15 from the first recess 16. As shown in Figures 5 through 7, when the finger grip 10 is slid toward the platform 4 and the finger grip 10, is released the finger grip 10 returns to its original shape.
Consequently, the projections 15 engage the second recess 17.
The nut 11 and the threaded bolt 13 together with the base 9 of the slider 3 are moved toward the platform 4 along the bore 6, so that the orbicular peripheral cutting edge 8a of the disc blade 8 protrudes beyond the peripheral edge 4c.
When cantilevered projection 14 of the slider 3 moves toward the distal end of the platform 4, the tip 14a contacts the tongue 7.
Therefore, the tip 14a contacts the disc blade 8. The tip 14a applies frictional pressure to the disc blade 8 in the direction indicated by the arrow A, as shown in Figure 7. As a result, the 2r?~ 53 frictional force applied to the disc blade 8 is significantly increased when the disc blade 8 rotates.
When the cutter is in use, the finger grip 10 of the slider 3 is moved toward the distal end of the platform 4, as previously described. Therefore, the orbicular peripheral cutting edge 8a of the disc blade 8 protrudes beyond the peripheral edge 4c. The blade 8 is pressed against the material to be cut, and pressure is applied to the handle 1 for causing the blade 8 to cut through the material.
According to the first embodiment of the present invention, the cantilevered elastic projection 14 is arranged on the slider 3.
When the cutter is in use, the cantilevered elastic projection 14 presses against the disc blade 8. Therefore, the appropriate rotational friction force can be applied to the disc blade 8 by means of the slider 3, without the use of a new part.
A second embodiment of the rotary disc blade cutter according to the present invention will now be described with reference to Figures 8 and 9, with specific focus on the differences between the two embodiments.
A blade 28 has a straight cutting edge 28a. An opening 18 is arranged at the distal end of a handle 21. The opening 18 communicates with a groove 22. The blade 28 is inserted into the handle 21 through the opening 18. A projection 19 is arranged on 2~ S~
a base 29 of a slider 23. The base section of the blade 28 is inserted into the projection 19. Therefore, the slider 23 and the blade 28 can be integrally moved.
The operation of the cutter will now be described. The slider 23 is moved toward the distal end by means of a finger grip 30, so that the blade 28, which is retracted into the groove 22 of the handle 21, is caused to protrude beyond the opening 18. The distance traveled by the slider 23 controls the length of the blade 28 protruding beyond the handle 21, or retracted therein.
When the cutter is in use, a tip 34a of a cantilevered elastic projection 34 of the slider 23 is pressed by a tongue 27. The tongue 27 is pressed against the blade 28 at an inner surface of the opening 18 of the handle 21. As a result, the blade 28 is pressed against the inner surface of the opening 18, so that the sway of the blade 28 is significantly reduced.
The present invention can be used in conjunction with a plurality of blades with various shapes, other than those described in the present specification.
Although only two embodiments of the present invention have been described, it should become apparent to those skilled in the art that the present invention may be embodied in many other specific forms without departing from the scope of the invention.
C U '1"1'~; K
Background of the Invention Field of the Invention The present invention generally relates to a cutter. More particularly, it relates to a cutter having a blade which is slidably extendable to a protracted cutting position and a retracted storage position.
Description of the Prior Art The following conventional cutters are well known and exemplify the state of the art in the field. A rotary cutter has a disc shaped blade which rotatably and pivotally moves with respect to a stationary handle. A conventional cutter knife has a straight cutting edge. The cutting edge slidably protrudes to permit cutting and is retracted for storage.
The rotary cutter allows the rotational friction force to be adjusted, in order to improve the performance of the cutter. The United States patent No. 4,301,594 discloses one type of rotary cutters. The cutter has a slider arranged at one end section of a handle. A disc shaped blade is secured to the slider by means of a fastening device, at its center section. Consequently, an appropriate rotational friction force could be applied to the 2~7~;~53 disc blade so as to prevent a free, arbitrary rotation of the disc blade during the cutting operation.
However, when the fastening device is excessively tightened, the rotational friction force is significantly increased.
Consequently, the disc blade becomes hard to rotate. When the fastening device becomes loose, the rotational friction force is significantly decreased so that the disc blade starts to freely rotate. As a result, the adjustment of the fastening device becomes rather difficult. If the adjustment is improperly made, the cutting ability of the cutter decrease.
The Japanese Unexamined Utility Model Publication No. 61-54752 discloses a cutter knife which has a straight cutting edge. The cutter knife has a pair of grooves within its handle. The grooves communicate with an outer peripheral end of the elongated handle.
One of distal ends of the handle is opened. When a slider is moved along the grooves, the blade is caused to slide by the slider so that the cutting edge of the blade protrudes beyond the distal end of the handle, through the opening in the distal end of the handle.
When the blade is extended by the slider and touches the inner wall of the opening, the sliding ability of the blade significantly decreases. Therefore, it is necessary to create a relatively small gap between the inner wall of the opening and the blade. Consequently, the blade that can not be securely held 2~7~53 in position creates a swaying motion during the cutting operation. As a result, the cutting ability of the blade decreases.
Summary of the Invention It is therefore an object of the present invention to provide a cutter with a rotatable and slidable blade and a slider, for stable handling.
Another object of the present invention is to provide a cutter having a rotatable and slidable blade, such that the blade is securely supported during the cutting operation in order to increase the cutting ability of the cutter.
To achieve the foregoing and other objects there is provided a cutter which includes a handle and a disc blade. The blade can be protracted or retracted. A slider is connected to the blade and slidably supports the handle, and permits the blade to move between a cutting position and a storage position. A pressure applying device includes a cantilevered elastic projection formed on the slider to abut against the blade. The cantilevered projection abuts against the blade when the blade is in use.
In one aspect of the present invention, a disc blade is rotatably attached to the distal end of the handle. The distal end has a disc shape, generally proportioned to the disc blade. When the disc blade is extended to forward the cutting position, the cantilevered projection abuts against the inner surface of the disc blade and applies a rotational friction force to the disc blade.
In another aspect of the present invention, a blade which has a straight cutting edge that can be extended into a cutting position beyond the distal end of the handle. The cutting edge is retractable within the handle, for storage, when the cutter is not in used. The blade is pushed against the inner peripheral edge of the opening by means of the cantilevered projection, in order to avert the undesirable sway of the blade.
Therefore, in accordance with the present invention, there is provided a cutter comprising:
a handle including an elongated groove;
a blade having a first surface and a second surface, said first surface facing said handle, said blade being movable between a cutting position and a storage position;
slider means, connected to said blade and slidably supported by said handle and along said elongated groove, for selectively moving said blade between said cutting and storage positions and for holding said blade in said cutting and said storage posltlons;
said slider means including resisting means for frictionally resisting a free movement of said blade during a cutting operation, a base portion that is generally positioned in proximity of said first surface of said blade, and a positioning portion which extends from said base portion for securely~5 positioning the blade in one of said positions;
said handle including pressing means for pressing said resisting means against said first - 4a -surface of said blade when said blade is in said cutting position;
said resisting means including a resilient member which projects from the base portion toward said first surface of the blade and positioned such that said resilient member is forced toward said first surface of the blade when said blade is moved from said storage position to said cutting position;
wherein said blade has a generally disc shape and is rotatably mounted on said slider means, and wherein said handle includes a platform extended from an end of said handle and supporting the blade for rotation thereon.
Also in accordance with the present invention, there is provided a movable blade cutter comprising:
a handle;
a blade having a first surface and a second surface, the first surface facing the handle, said blade being movable between a cutting position and a storage position;
said handle including an elongated groove;
slider means being slidably movable within said elongated groove and connected to said blade,~5 and slidably supported by said handle, for switching the blade position between the cutting position and the storage position;
said slider means including resisting means for frictionally resisting a free movement of the~0 blade during a cutting operation;
said handle including pressing means for pressing the resisting means against said first surface of the blade in the cutting position; and a platform extending from an end of the~5 handle;
- 4b -wherein the blade is rotatably mounted on said slider means and is supported by said platform for rotation thereon.
Further in accordance with the present invention, there is provided a movable blade cutter comprising:
a handle;
a blade having a first surface and a second surface, the first surface facing the handle, said blade being movable between a cutting position and a storage position;
slider means, connected to said blade and slidably supported by said handle, for switching said ~ blade between said cutting position and said storage position;
said slider means including a base portion being generally positioned in proximity of said first surface of said blade, and a positioning portion extending from said base portion for securely positioning said blade in one of said positions;
said handle including an elongated groove, and said slider means being slidably movable within said elongated groove;
said elongated groove including a plurality of setting recesses, and said slider means including a plurality of projections engaging said setting recesses for causing said blade to be securely retained in one of said positions;
said slider means including resisting means for frictionally resisting a free movement of said blade during a cutting operation;
said resisting means including a resilient member for abutting said first surface when said blade is in said cutting position;
said handle including at least one tapered surface positioned adjacent said blade such that said resilient member contacts said tapered surface and is forced toward said blade when said blade is switched from said storage position to said cutting position;
wherein said blade has a generally disc shape and is rotatably mounted on said slider means, and wherein said handle further includes a platform extending from an end of said handle and supporting the blade for rotation thereon.
Brief Description of the Drawings Figure 1 is a plan view of a rotary disc blade cutter, showing the blade retracted according to a first embodiment of the present invention;
Figure 2 is a near plan view of the cutter of Figure l;
Figure 3 is an enlarged partially broken plan view of the rotary disc blade of Figure 1, illustrating a slider in engagement with a handle;
Figure 4 is a cross-sectional view of the cutter taken along line IV-IV in Figure 1;
2~?7~i~53 Figure 5 is a side view of the cutter showing the blade in a protracted position;
Figure 6 is a partially broken plan view of the cutter of Figure 5;
Figure 7 is a cross-sectional view of the cutter taken along line VII - VII in Figure 5;
Figure 8 is a side view of a cutter having a straight cutting edge shown protracted according to a second embodiment of the present invention; and Figure 9 is a cross-sectional side view taken along line IX - IX
in Figure 8.
Description of the Preferred Embodiments A preferred first embodiment of a rotary cutter according to the present invention, will now be described with reference to Figures 1 through 7.
As illustrated in Figure 1, the cutter includes a generally elongated handle which is made of synthetic resin. An elongated groove 2 guides a slider 3 along the front surface of the handle 1. An aperture B is formed in the handle 1, for hooking the 2~7~S3 cutter when it is not in use. When the slider 3 is manually slid, the slider 3 is guided by the inner peripheral edge of the groove 2 along length of the handle 1.
The distal end of the handle 1 includes an enlarged platform 4 which supports a disc blade 8. The platform 4 has a rear generally flat surface. One surface of the platform 4 is designated as an upper surface 4b, and engages the disc blade.
As shown in Figure 3, the upper surface 4b has a slot 5 and a bore 6. The slot 5 and the bore 6 are adjacent to each other, and are located along the sliding direction of the slider 3. The bore 6 is positioned closer to the peripheral edge of the platform 4. A relatively inclined tongue 7 is formed at the distal end of the slot 5. The distal end of the tongue 7 is most inclined than its proximal end, and is closer to the front surface 4b.
The disc blade 8 is rotatably supported on the front surface 4b, and has an orbicular peripheral cutting edge 8a. When the cutter is not in use, the disc blade 8 is retracted so that the cutting edge 8a is securely held within an arc shaped peripheral edge 4c of the platform 4. As shown in Figures 5 through 7, when the cutter is in use, a portion of the cutting edge 8a is caused to protrude beyond the peripheral edge 4c by the slider 3.
The slider 3 is made of a synthetic resin. As shown in Figure 4, the slider 3 is integrally formed with a generally thin 2~ 53 rectangularly shaped base 9, and a generally short finger grip 10. The base 9 is disposed on the rear surface of the platform 4 with the slider 3 placed in the groove 2. The finger grip 10 is easily accessible by the user. When the finger grip 10 is pressed, it is bent toward the rear surface direction. When the pressure is released, the elastic finger grip 10 returns to its original position.
A nut 11 engages the base 9, and is securely fastened to the central section of the disc blade 8, through the bore 6 of the platform 4. A spring washer 12 is mounted on the upper surface of the disc blade 8. A threaded bolt 13 is inserted in the spring washer 12, and the disc blade 8 is coupled to the nut 11.
Therefore, the disc blade 8 is securely fastened against the upper surface 4b by the spring washer 12. The disc blade 8 may rotate steadily around the axis of the nut 11.
A cantilevered elastic projection 14 extends from the base 9 of the slider 3, and projects outwardly toward the distal end of the disc blade 8. It is inserted into the slot 5 of the platform 4, and is disposed within the inner side of the disc blade 8. A tip 14a is used to apply pressure to the blade 8, is formed at the distal end of the cantilevered projection 14, and engages the tongue 7.
As shown in Figure 1, the finger grip 10 includes a pair of projections 15 for positioning the blade 8. A pair of recesses -- 2~~~53 16 and 17 engage the projections 15 for locking the blade into positlon .
As shown in Figures 1 though 4, when the cutter is not in use, the projections 15 of the finger grip 10 are inserted in the first recess 16, so that the orbicular peripheral cutting edge 8a of the disc blade 8 is retracted and is securely held within the arc shaped peripheral edge 4c of the platform 4. The tip 14a of the slider 3 is then disengaged from the tongue 7. Therefore, the tip 14a does not contact the disc blade 8.
When the cutter is in use, the finger grip 10 of the slider 3 is pushed forward so as to disengage the projections 15 from the first recess 16. As shown in Figures 5 through 7, when the finger grip 10 is slid toward the platform 4 and the finger grip 10, is released the finger grip 10 returns to its original shape.
Consequently, the projections 15 engage the second recess 17.
The nut 11 and the threaded bolt 13 together with the base 9 of the slider 3 are moved toward the platform 4 along the bore 6, so that the orbicular peripheral cutting edge 8a of the disc blade 8 protrudes beyond the peripheral edge 4c.
When cantilevered projection 14 of the slider 3 moves toward the distal end of the platform 4, the tip 14a contacts the tongue 7.
Therefore, the tip 14a contacts the disc blade 8. The tip 14a applies frictional pressure to the disc blade 8 in the direction indicated by the arrow A, as shown in Figure 7. As a result, the 2r?~ 53 frictional force applied to the disc blade 8 is significantly increased when the disc blade 8 rotates.
When the cutter is in use, the finger grip 10 of the slider 3 is moved toward the distal end of the platform 4, as previously described. Therefore, the orbicular peripheral cutting edge 8a of the disc blade 8 protrudes beyond the peripheral edge 4c. The blade 8 is pressed against the material to be cut, and pressure is applied to the handle 1 for causing the blade 8 to cut through the material.
According to the first embodiment of the present invention, the cantilevered elastic projection 14 is arranged on the slider 3.
When the cutter is in use, the cantilevered elastic projection 14 presses against the disc blade 8. Therefore, the appropriate rotational friction force can be applied to the disc blade 8 by means of the slider 3, without the use of a new part.
A second embodiment of the rotary disc blade cutter according to the present invention will now be described with reference to Figures 8 and 9, with specific focus on the differences between the two embodiments.
A blade 28 has a straight cutting edge 28a. An opening 18 is arranged at the distal end of a handle 21. The opening 18 communicates with a groove 22. The blade 28 is inserted into the handle 21 through the opening 18. A projection 19 is arranged on 2~ S~
a base 29 of a slider 23. The base section of the blade 28 is inserted into the projection 19. Therefore, the slider 23 and the blade 28 can be integrally moved.
The operation of the cutter will now be described. The slider 23 is moved toward the distal end by means of a finger grip 30, so that the blade 28, which is retracted into the groove 22 of the handle 21, is caused to protrude beyond the opening 18. The distance traveled by the slider 23 controls the length of the blade 28 protruding beyond the handle 21, or retracted therein.
When the cutter is in use, a tip 34a of a cantilevered elastic projection 34 of the slider 23 is pressed by a tongue 27. The tongue 27 is pressed against the blade 28 at an inner surface of the opening 18 of the handle 21. As a result, the blade 28 is pressed against the inner surface of the opening 18, so that the sway of the blade 28 is significantly reduced.
The present invention can be used in conjunction with a plurality of blades with various shapes, other than those described in the present specification.
Although only two embodiments of the present invention have been described, it should become apparent to those skilled in the art that the present invention may be embodied in many other specific forms without departing from the scope of the invention.
Claims (6)
1. A cutter comprising:
a handle including an elongated groove;
a blade having a first surface and a second surface, said first surface facing said handle, said blade being movable between a cutting position and a storage position;
slider means, connected to said blade and slidably supported by said handle and along said elongated groove, for selectively moving said blade between said cutting and storage positions and for holding said blade in said cutting and said storage positions;
said slider means including resisting means for frictionally resisting a free movement of said blade during a cutting operation, a base portion that is generally positioned in proximity of said first surface of said blade, and a positioning portion which extends from said base portion for securely positioning the blade in one of said positions;
said handle including pressing means for pressing said resisting means against said first surface of said blade when said blade is in said cutting position;
said resisting means including a resilient member which projects from the base portion toward said first surface of the blade and positioned such that said resilient member is forced toward said first surface of the blade when said blade is moved from said storage position to said cutting position;
wherein said blade has a generally disc shape and is rotatably mounted on said slider means, and wherein said handle includes a platform extended from an end of said handle and supporting the blade for rotation thereon.
a handle including an elongated groove;
a blade having a first surface and a second surface, said first surface facing said handle, said blade being movable between a cutting position and a storage position;
slider means, connected to said blade and slidably supported by said handle and along said elongated groove, for selectively moving said blade between said cutting and storage positions and for holding said blade in said cutting and said storage positions;
said slider means including resisting means for frictionally resisting a free movement of said blade during a cutting operation, a base portion that is generally positioned in proximity of said first surface of said blade, and a positioning portion which extends from said base portion for securely positioning the blade in one of said positions;
said handle including pressing means for pressing said resisting means against said first surface of said blade when said blade is in said cutting position;
said resisting means including a resilient member which projects from the base portion toward said first surface of the blade and positioned such that said resilient member is forced toward said first surface of the blade when said blade is moved from said storage position to said cutting position;
wherein said blade has a generally disc shape and is rotatably mounted on said slider means, and wherein said handle includes a platform extended from an end of said handle and supporting the blade for rotation thereon.
2. A cutter according to claim 1, wherein said pressing means includes a plurality of tapered surfaces.
3. A movable blade cutter comprising:
a handle;
a blade having a first surface and a second surface, the first surface facing the handle, said blade being movable between a cutting position and a storage position;
said handle including an elongated groove;
slider means being slidably movable within said elongated groove and connected to said blade, and slidably supported by said handle, for switching the blade position between the cutting position and the storage position;
said slider means including resisting means for frictionally resisting a free movement of the blade during a cutting operation;
said handle including pressing means for pressing the resisting means against said first surface of the blade in the cutting position; and a platform extending from an end of the handle;
wherein the blade is rotatably mounted on said slider means and is supported by said platform for rotation thereon.
a handle;
a blade having a first surface and a second surface, the first surface facing the handle, said blade being movable between a cutting position and a storage position;
said handle including an elongated groove;
slider means being slidably movable within said elongated groove and connected to said blade, and slidably supported by said handle, for switching the blade position between the cutting position and the storage position;
said slider means including resisting means for frictionally resisting a free movement of the blade during a cutting operation;
said handle including pressing means for pressing the resisting means against said first surface of the blade in the cutting position; and a platform extending from an end of the handle;
wherein the blade is rotatably mounted on said slider means and is supported by said platform for rotation thereon.
4. A cutter according to claim 3, wherein said slider means includes a base portion that is generally positioned in proximity of the first surface of said blade, and a positioning portion which extends from the base portion for securely positioning the blade in one of said positions.
5. A cutter according to claim 4, wherein said elongated groove includes a plurality of setting recesses, and wherein said positioning portion includes a plurality of projections which engage said setting recesses for causing said blade to be securely retained in one of said positions.
6. A movable blade cutter comprising:
a handle;
a blade having a first surface and a second surface, the first surface facing the handle, said blade being movable between a cutting position and a storage position;
slider means, connected to said blade and slidably supported by said handle, for switching said blade between said cutting position and said storage position;
said slider means including a base portion being generally positioned in proximity of said first surface of said blade, and a positioning portion extending from said base portion for securely positioning said blade in one of said positions;
said handle including an elongated groove, and said slider means being slidably movable within said elongated groove;
said elongated groove including a plurality of setting recesses, and said slider means including a plurality of projections engaging said setting recesses for causing said blade to be securely retained in one of said positions;
said slider means including resisting means for frictionally resisting a free movement of said blade during a cutting operation;
said resisting means including a resilient member for abutting said first surface when said blade is in said cutting position;
said handle including at least one tapered surface positioned adjacent said blade such that said resilient member contacts said tapered surface and is forced toward said blade when said blade is switched from said storage position to said cutting position;
wherein said blade has a generally disc shape and is rotatably mounted on said slider means, and wherein said handle further includes a platform extending from an end of said handle and supporting the blade for rotation thereon.
a handle;
a blade having a first surface and a second surface, the first surface facing the handle, said blade being movable between a cutting position and a storage position;
slider means, connected to said blade and slidably supported by said handle, for switching said blade between said cutting position and said storage position;
said slider means including a base portion being generally positioned in proximity of said first surface of said blade, and a positioning portion extending from said base portion for securely positioning said blade in one of said positions;
said handle including an elongated groove, and said slider means being slidably movable within said elongated groove;
said elongated groove including a plurality of setting recesses, and said slider means including a plurality of projections engaging said setting recesses for causing said blade to be securely retained in one of said positions;
said slider means including resisting means for frictionally resisting a free movement of said blade during a cutting operation;
said resisting means including a resilient member for abutting said first surface when said blade is in said cutting position;
said handle including at least one tapered surface positioned adjacent said blade such that said resilient member contacts said tapered surface and is forced toward said blade when said blade is switched from said storage position to said cutting position;
wherein said blade has a generally disc shape and is rotatably mounted on said slider means, and wherein said handle further includes a platform extending from an end of said handle and supporting the blade for rotation thereon.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9818792 | 1992-04-17 | ||
| JP4-98187 | 1992-04-17 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2076453A1 CA2076453A1 (en) | 1993-10-28 |
| CA2076453C true CA2076453C (en) | 1998-06-16 |
Family
ID=14213020
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2076453 Expired - Fee Related CA2076453C (en) | 1992-04-17 | 1992-08-20 | Cutter |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2076453C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102490192A (en) * | 2011-11-25 | 2012-06-13 | 成都鑫三洋科技发展有限公司 | Practical scraping knife with standby blade |
| CN102431047A (en) * | 2011-11-25 | 2012-05-02 | 成都鑫三洋科技发展有限公司 | Practical utility knife with blade protecting plate |
-
1992
- 1992-08-20 CA CA 2076453 patent/CA2076453C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2076453A1 (en) | 1993-10-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |