CA1261601A - Cutter having circular rotary blade - Google Patents
Cutter having circular rotary bladeInfo
- Publication number
- CA1261601A CA1261601A CA000506400A CA506400A CA1261601A CA 1261601 A CA1261601 A CA 1261601A CA 000506400 A CA000506400 A CA 000506400A CA 506400 A CA506400 A CA 506400A CA 1261601 A CA1261601 A CA 1261601A
- Authority
- CA
- Canada
- Prior art keywords
- blade
- circular
- handle
- cutter
- mounting section
- 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
Links
Abstract
ABSTRACT OF THE DISCLOSURE
A cutter having a circular rotary blade comprises: a handle; a blade mounting section formed on one end of the handle; a circular blade secured to one side of the blade mounting section and rotatably carried at its central portion; a hole having an opening formed in the blade mounting section at a position behind the central portion of the circular disc and corresponding to the circular blade;
a pressing member movably received in the hole and protectable through the opening of the hole into pressure contact with one side of the circular blade.
A cutter having a circular rotary blade comprises: a handle; a blade mounting section formed on one end of the handle; a circular blade secured to one side of the blade mounting section and rotatably carried at its central portion; a hole having an opening formed in the blade mounting section at a position behind the central portion of the circular disc and corresponding to the circular blade;
a pressing member movably received in the hole and protectable through the opening of the hole into pressure contact with one side of the circular blade.
Description
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TITLE OF THE INVENTION
CUTTER HAVING CIRCULAR ROTARY BLADE
BACKGROUND OF THE INVENTION
Field of the Invèntion The present invention relates to a cutter having a circular rotary blade which is rotatably supported at its center on one side of a blàde mounting portion of a handle. More particularly, the invention is concerned~wlth a cutter of the above-mentloned type wherein the resistance to rotation of the circular blade is adjustable according to the kind of the object to be cut.
Desaription of the Prior Art Japanese Utility Model Laid-Open No.
: ~ :
49674/1983 discloses a cutter having a circular rotary blade.~ In ~thi~s~ cutter~, the circular blade has a tendency that the ~peripheral edge of the blade is~
resiliently deformed over the entire circumference in an undulating manner during the rotation of the blade.
The cut end of the object cut by such an undulating edge is curved undesirably.
SUMMARY~OF THE INVENTION~
The present invention seeks to provide a cutter having a circular rotary blade, wherein the undulation of the circular disc when the disc is ; ~ .
rotated against a certain resistance is substantially minimized thereby preventing the cut end of an object from being curved.
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The invention also seeks to provide a cutter having a circular rotary blade, wherein the resistance to the rotation of the blade is adjustable in accordance with the kind of the object to be cut.
Still urther the invention seeks to provide a cutter having a circular rotary blade, wherein the rotation of the circular blade during ~he cutting operation is controlled by adjustment of the fric-tioning condition.
-The invention also seeks to provide a cutter having a circular rotary blade, improved to facilitate the visual check of the cutting edge of the circular blade during cutting of the object.
Still further the invention seeks to provide a cutter having a circular rotary blade, improved to prevent projection of the cutting edge of the blade when the cutter is not used.
Still further the invention seeks to provide a cutter having a circular rotary blade, wherein, when the cutter is used, the cutting edge of the blade can be projected beyond a protective member not only towards the end of the handle but also in the breadth-wise direction of the handle.
In accordance with the invention, there is provided a cut-ter having a circular rotary blade comprising: a handle; a blade mounting portion formed on one end of the handle, a circular blade secured to one side of the blade mounting portion and rotatably ~2~6(~ `
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carried at its central portion; a slot or hole having an opening formed in the blade mounting section at a position behind the central portion of the circular blade and corresponding to the circular blade; and a p~essing member movably received in the slot or hole and projectable through the opening of the slot or hole nto pressure contact with one side of the circular blade.
An operation member is adapted to limit the movement of the pressing member so as to adjust the pressure of contact between the pressing member and the circular blade. The operation member is held in engagement with the pressing~ member and positioned on the opposite side of~the blade mounting dispatch to the circular blade.
The lnvention is further explained by refer-~-~ ence to the following description of the preferred :~,: : :
embodiments~ Fe~atures and advantages of the invention which are not specifically mentioned in the specifica-tion will be realized by those skilled in the art carrying out this invention.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a partial front elevational view of a cutter having a circular rotary blade embodying the present invention;
Fig. 2 is a sectional view taken ,along the line II-II of Fig. l;
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Fig. 3 is an exploded perspective view o~ the cutter showing speciEically a pressing member and an operation ~! member;
, , Fig. 4 ls a bottom plan view of a pressing member showiny an engaging sur~ace thereof; and Fig. S ls a partial rear elevational view o~ the cutter in accordance with the invention having a circular rotary blade.
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~10 DESCRIPTION O~ ~rHE PREERRED EMBODIMENT
~ A preEerred embodiment of the invention will be `' described hereinunder with reference to the accompanying ~ drawings.
il~ The cutter in accordance with the invention has a handle l~which~ i6 provided at~its front end with a blade mounting s~ection 3 on both sides of whiah are formed suporting portions 4,5. A supporting hole 6 is formed to ~:,. : .
extend from one to the other of these supporting portions 4 and S. A circular blad ~7 is laid on one 4 of the supporting portions. A stopper screw 8 is extended i through a cenLral hole 7a ln the blade 7 into the supporting bore 6 not rotatably. A nut 9 is screwed to the end o~ the screw 8 projecting out of the o~her supporting portion 5 until it tigh~tly contacts the surface oE the suppOrting portion 5. In this state, the circular blade 7 A
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is pressed at a suitable level of pressure onto the supporting portion 4 by the tension acting on the stopper screw 8, so that the blade 7 is rotatable with a certain level of ~riction resistance, A slit 10 is formed in the supporting portion 4 of the blade mounting portion 3. The slit 10 has an opening lOa which spreads at the rearlside of the central hole 7a of the blade 7 over an arcuate region corresponding to a certain circumferential length of the rear part of the : , central hole 7a, and exteods vertically from the supporting portion 4 to a rear part~of the other supporting portion 5.
A pressing member 11 received in the slot 10 is adapted to be moved in the directionlsubstantially perpendicular to : the plane o~ the circular blade 7 such as to be pressed to the lower side of the blade 7 through the opening lOa.
An operation member 14~has a base 15 which is slidably superposed to~the surface of the blade mounting section 3 opposite to the blade 7.: The base 15 has a hole 16 which rotatably receives the supporting por.tion 5. A guide ~: 20 projection 17 projected from the rear end of the base 15 movably fits ln a guide groove 18 formed in the rear end ; : port1on of the blade mounting portion 3.
A manipulation tab 19 projected rearwardly from the : rear end of the base 15 is slidably superposed to an outer . surface of the handle i. I A finger-retaining portion 20 is ,~ : I
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formed on the manipulation tab 19. The pressing member 11 and the operation member 14 engage with each other at their slant engaging surfaces 12,21 serving as cam surfaces. The ~ . .
arrangement is such thatla plurality of retaining projections 13 formed on the engaging surface 12 of the pressing member 11 are received in corresponding recesses 22 formed in the engaging surface 21 of the operation ` member 14.
When the operation member 14 is rotationally slided in : 10 the direction of an arrow A in Fig. 5, the pressing member ~, 11 is raised due to the;cam effect of the slant engaging surfaces 12,21. As a result, the pr~ssing member 11 projects through the opening lOa of the slot 10 towards the circular blade 7 so as to make a pressure contact therewith, so that a frictional resistance of a level correspondlng to thecontact pressure ls produced to resist the rotation of:the disc 7. The pressing member 11 is held at the projecting position due to the engagement between the projections 13 on the pressing member 11 and the recesses 22 in the operation member 14. The contact pressure between the pressing member 11 and the circular blade 7 is ad~justable through varying the amount of projection of the pressing member 11 which in turn is caused by rotating the o~eration member 14 to vary the position of engagement bltween both slant engaging surfaces ~2~
12 and 21.
The protective member 23 is composed of a disc portion 24 greater in diameter than the circular disc 7 and a base portion 25 projected from the rear portion of the disc portion 24. The peripheral portion of the disc 24 constitutes a back-up portion 24a which backs up the cutting edge portion of the circular blade 7. An aperture 26 large enough to permit the movement of the disc 7 i9 formed in the central portion of the disc portion 24. A
pair of leaf sprlngs~27 extend forwardly from both lateral ~ides of the base portion 25 of the protective member 23.
On the other hand, a leaf spring 29 is loaded to act on a step surface 28 ~ormed in the rear portion of the bottom surface oE the base portion 25. A guide projection 30 is formed on the bottom surface of the:base portion 25 of the protective member 23~ at a pos1tion ahead of the leaf spring 29. a pair of gui~de ridges 31 extend longitudinally of the handle; l~at both sides of the guide projection 30.
The protective member 23 fits in a space defined by the inner surface of the circular blade 7 and one lateral side of the blade mounting section 3 of the handle, when the circular;blade 7 is pressed onto the supporting portion 4 of the blade mounting ~ortion 3. In this state, the supporting portion 4 is loosely received in the aperture 26 formed in the disc portion 24. A space for allowing the : ' , : -7-. ' , .
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movement of the protective member 23 is formed between the inner peripheral surface of the aperture 26 and the outer peripheral sUrface of the supporting portion 4. At the same time, the base portion 25 of the protective member 23 fits in a recess 32 formed in the front end portion of the handle 1. In this state' the guide projection 30 on the base portion 25 of the protective member 23 is slidably received in a guide groove 33 formed in the bottom of the recess 32 so as to extend longitudinally of the handle 1.
In addition, the leaf springs 27 on both lateral sides of the base portion 25 resiliently contact opposing side walls 32a o the recess 32, and the leaf spring 29 provided on the ~- rear end of the base portion 25 abuts the step 32b on the rear end of the recess 32.
Therefore,~the protective member 23 is swingable to the left and right about the axis of the guide projection 30 over an area limited by the aperture 26 in the breadthwise direction of the handle 1, overcoming the ` resilient force exerted by respective leaf springs 27.
The protective member 23 is movable also in the longitudinal direction of the hanale 1 along the guide groove 33 against the leaf spring 29.
When the cutter i~ not used, the supporting portion 4 of the blade mounting section 3 is centralized in the aperture 26 due to balance of resilient forces exerted by . .
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126~L6(:91 the leaf springs 27. At the same time, the protectivP
member 23 is urged resillently in the ~orward direction by the force of the leaf spring 29, but the edge 7b of the circular blade 7 is prevented by the back-up portion 24a of the disc portion 24 from projecting outwardly. A cover 34 is placed to overlie the recess 32 with its three legs 34a retained by retaining holes 35 in the recess 32~ thereby covering the base portion 25 of the protective member 23.
In the use of the cutter o~ the invention having the circul~r rotary blade, the pressure of the contact between the pres~ing member 11 and the circular disc 7 is adjusted in accordance with the kind of the material to be cut, in a manner explained before. Subsequently, handle 1 is placed at a suitable angle of inclination to the object to be cut : : ~
and is moved in the direction of cutting while the circular dlsc 7 is pressed onto.the object to be cut. As a result, - ~ the protective member 23;is moved in the~longitudinal or ~;~ breadthwise direction of the handle 1 while making contact with one s~ide-of the circular blade 7, in accordance with the angle of inclination of the handle 1. Meanwhile, the back-up portion 24a slides on the object to be cut, while the edge 7b of the circular blade 7 projects in any direction beyond the back-up portion 24a to cut into the object to be cut. Consequently, the circular blade 7 rolls on the object to be cut, while making a slight ~lip .
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~ on the object to be cut. After the use, as the protective .
:: member 23 is automatically retracted to the inoperative position by the resilient force of the leaf spring 29.
As has been described, since the circular blade of the invention is pressed at its portion behind the central bore 7a, the cutting edge 7b on the front side o the circular ; blade 7 is not affected by the pressure exerted by the pressing member so that the object is cut to exhibit a ` linear cut end. At the same time, the pressing member 11 is:always received in the hole 10 ~ormed in the blade ~;. mounting portion 3, while the operating member 14 which : engages with the pressing member 11 through the cam : surfaces 12,21 is positioned on the side of the blade ~` : mounting section 3 opposite to the circular blade 7.
Therefore, these: members 11!14 do not project into the ; outer space EaciLng the cir~cular blade 7 so that the edge 7b of the circular blade 7 is visually~checked easily from the : upper side during the use o the cutter.
Although the inventi~on has been described through ~specific terms, it is to be understood that the described .: embodiment of the invention is not exclusive and various :
changes and modifications may be imparted thereto without :
~i departing from the scope of the invention which is limited -, ~': solely by the appended clalms.
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TITLE OF THE INVENTION
CUTTER HAVING CIRCULAR ROTARY BLADE
BACKGROUND OF THE INVENTION
Field of the Invèntion The present invention relates to a cutter having a circular rotary blade which is rotatably supported at its center on one side of a blàde mounting portion of a handle. More particularly, the invention is concerned~wlth a cutter of the above-mentloned type wherein the resistance to rotation of the circular blade is adjustable according to the kind of the object to be cut.
Desaription of the Prior Art Japanese Utility Model Laid-Open No.
: ~ :
49674/1983 discloses a cutter having a circular rotary blade.~ In ~thi~s~ cutter~, the circular blade has a tendency that the ~peripheral edge of the blade is~
resiliently deformed over the entire circumference in an undulating manner during the rotation of the blade.
The cut end of the object cut by such an undulating edge is curved undesirably.
SUMMARY~OF THE INVENTION~
The present invention seeks to provide a cutter having a circular rotary blade, wherein the undulation of the circular disc when the disc is ; ~ .
rotated against a certain resistance is substantially minimized thereby preventing the cut end of an object from being curved.
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-3~26~L60~
The invention also seeks to provide a cutter having a circular rotary blade, wherein the resistance to the rotation of the blade is adjustable in accordance with the kind of the object to be cut.
Still urther the invention seeks to provide a cutter having a circular rotary blade, wherein the rotation of the circular blade during ~he cutting operation is controlled by adjustment of the fric-tioning condition.
-The invention also seeks to provide a cutter having a circular rotary blade, improved to facilitate the visual check of the cutting edge of the circular blade during cutting of the object.
Still further the invention seeks to provide a cutter having a circular rotary blade, improved to prevent projection of the cutting edge of the blade when the cutter is not used.
Still further the invention seeks to provide a cutter having a circular rotary blade, wherein, when the cutter is used, the cutting edge of the blade can be projected beyond a protective member not only towards the end of the handle but also in the breadth-wise direction of the handle.
In accordance with the invention, there is provided a cut-ter having a circular rotary blade comprising: a handle; a blade mounting portion formed on one end of the handle, a circular blade secured to one side of the blade mounting portion and rotatably ~2~6(~ `
.
carried at its central portion; a slot or hole having an opening formed in the blade mounting section at a position behind the central portion of the circular blade and corresponding to the circular blade; and a p~essing member movably received in the slot or hole and projectable through the opening of the slot or hole nto pressure contact with one side of the circular blade.
An operation member is adapted to limit the movement of the pressing member so as to adjust the pressure of contact between the pressing member and the circular blade. The operation member is held in engagement with the pressing~ member and positioned on the opposite side of~the blade mounting dispatch to the circular blade.
The lnvention is further explained by refer-~-~ ence to the following description of the preferred :~,: : :
embodiments~ Fe~atures and advantages of the invention which are not specifically mentioned in the specifica-tion will be realized by those skilled in the art carrying out this invention.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a partial front elevational view of a cutter having a circular rotary blade embodying the present invention;
Fig. 2 is a sectional view taken ,along the line II-II of Fig. l;
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Fig. 3 is an exploded perspective view o~ the cutter showing speciEically a pressing member and an operation ~! member;
, , Fig. 4 ls a bottom plan view of a pressing member showiny an engaging sur~ace thereof; and Fig. S ls a partial rear elevational view o~ the cutter in accordance with the invention having a circular rotary blade.
.
~10 DESCRIPTION O~ ~rHE PREERRED EMBODIMENT
~ A preEerred embodiment of the invention will be `' described hereinunder with reference to the accompanying ~ drawings.
il~ The cutter in accordance with the invention has a handle l~which~ i6 provided at~its front end with a blade mounting s~ection 3 on both sides of whiah are formed suporting portions 4,5. A supporting hole 6 is formed to ~:,. : .
extend from one to the other of these supporting portions 4 and S. A circular blad ~7 is laid on one 4 of the supporting portions. A stopper screw 8 is extended i through a cenLral hole 7a ln the blade 7 into the supporting bore 6 not rotatably. A nut 9 is screwed to the end o~ the screw 8 projecting out of the o~her supporting portion 5 until it tigh~tly contacts the surface oE the suppOrting portion 5. In this state, the circular blade 7 A
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is pressed at a suitable level of pressure onto the supporting portion 4 by the tension acting on the stopper screw 8, so that the blade 7 is rotatable with a certain level of ~riction resistance, A slit 10 is formed in the supporting portion 4 of the blade mounting portion 3. The slit 10 has an opening lOa which spreads at the rearlside of the central hole 7a of the blade 7 over an arcuate region corresponding to a certain circumferential length of the rear part of the : , central hole 7a, and exteods vertically from the supporting portion 4 to a rear part~of the other supporting portion 5.
A pressing member 11 received in the slot 10 is adapted to be moved in the directionlsubstantially perpendicular to : the plane o~ the circular blade 7 such as to be pressed to the lower side of the blade 7 through the opening lOa.
An operation member 14~has a base 15 which is slidably superposed to~the surface of the blade mounting section 3 opposite to the blade 7.: The base 15 has a hole 16 which rotatably receives the supporting por.tion 5. A guide ~: 20 projection 17 projected from the rear end of the base 15 movably fits ln a guide groove 18 formed in the rear end ; : port1on of the blade mounting portion 3.
A manipulation tab 19 projected rearwardly from the : rear end of the base 15 is slidably superposed to an outer . surface of the handle i. I A finger-retaining portion 20 is ,~ : I
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formed on the manipulation tab 19. The pressing member 11 and the operation member 14 engage with each other at their slant engaging surfaces 12,21 serving as cam surfaces. The ~ . .
arrangement is such thatla plurality of retaining projections 13 formed on the engaging surface 12 of the pressing member 11 are received in corresponding recesses 22 formed in the engaging surface 21 of the operation ` member 14.
When the operation member 14 is rotationally slided in : 10 the direction of an arrow A in Fig. 5, the pressing member ~, 11 is raised due to the;cam effect of the slant engaging surfaces 12,21. As a result, the pr~ssing member 11 projects through the opening lOa of the slot 10 towards the circular blade 7 so as to make a pressure contact therewith, so that a frictional resistance of a level correspondlng to thecontact pressure ls produced to resist the rotation of:the disc 7. The pressing member 11 is held at the projecting position due to the engagement between the projections 13 on the pressing member 11 and the recesses 22 in the operation member 14. The contact pressure between the pressing member 11 and the circular blade 7 is ad~justable through varying the amount of projection of the pressing member 11 which in turn is caused by rotating the o~eration member 14 to vary the position of engagement bltween both slant engaging surfaces ~2~
12 and 21.
The protective member 23 is composed of a disc portion 24 greater in diameter than the circular disc 7 and a base portion 25 projected from the rear portion of the disc portion 24. The peripheral portion of the disc 24 constitutes a back-up portion 24a which backs up the cutting edge portion of the circular blade 7. An aperture 26 large enough to permit the movement of the disc 7 i9 formed in the central portion of the disc portion 24. A
pair of leaf sprlngs~27 extend forwardly from both lateral ~ides of the base portion 25 of the protective member 23.
On the other hand, a leaf spring 29 is loaded to act on a step surface 28 ~ormed in the rear portion of the bottom surface oE the base portion 25. A guide projection 30 is formed on the bottom surface of the:base portion 25 of the protective member 23~ at a pos1tion ahead of the leaf spring 29. a pair of gui~de ridges 31 extend longitudinally of the handle; l~at both sides of the guide projection 30.
The protective member 23 fits in a space defined by the inner surface of the circular blade 7 and one lateral side of the blade mounting section 3 of the handle, when the circular;blade 7 is pressed onto the supporting portion 4 of the blade mounting ~ortion 3. In this state, the supporting portion 4 is loosely received in the aperture 26 formed in the disc portion 24. A space for allowing the : ' , : -7-. ' , .
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movement of the protective member 23 is formed between the inner peripheral surface of the aperture 26 and the outer peripheral sUrface of the supporting portion 4. At the same time, the base portion 25 of the protective member 23 fits in a recess 32 formed in the front end portion of the handle 1. In this state' the guide projection 30 on the base portion 25 of the protective member 23 is slidably received in a guide groove 33 formed in the bottom of the recess 32 so as to extend longitudinally of the handle 1.
In addition, the leaf springs 27 on both lateral sides of the base portion 25 resiliently contact opposing side walls 32a o the recess 32, and the leaf spring 29 provided on the ~- rear end of the base portion 25 abuts the step 32b on the rear end of the recess 32.
Therefore,~the protective member 23 is swingable to the left and right about the axis of the guide projection 30 over an area limited by the aperture 26 in the breadthwise direction of the handle 1, overcoming the ` resilient force exerted by respective leaf springs 27.
The protective member 23 is movable also in the longitudinal direction of the hanale 1 along the guide groove 33 against the leaf spring 29.
When the cutter i~ not used, the supporting portion 4 of the blade mounting section 3 is centralized in the aperture 26 due to balance of resilient forces exerted by . .
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:
126~L6(:91 the leaf springs 27. At the same time, the protectivP
member 23 is urged resillently in the ~orward direction by the force of the leaf spring 29, but the edge 7b of the circular blade 7 is prevented by the back-up portion 24a of the disc portion 24 from projecting outwardly. A cover 34 is placed to overlie the recess 32 with its three legs 34a retained by retaining holes 35 in the recess 32~ thereby covering the base portion 25 of the protective member 23.
In the use of the cutter o~ the invention having the circul~r rotary blade, the pressure of the contact between the pres~ing member 11 and the circular disc 7 is adjusted in accordance with the kind of the material to be cut, in a manner explained before. Subsequently, handle 1 is placed at a suitable angle of inclination to the object to be cut : : ~
and is moved in the direction of cutting while the circular dlsc 7 is pressed onto.the object to be cut. As a result, - ~ the protective member 23;is moved in the~longitudinal or ~;~ breadthwise direction of the handle 1 while making contact with one s~ide-of the circular blade 7, in accordance with the angle of inclination of the handle 1. Meanwhile, the back-up portion 24a slides on the object to be cut, while the edge 7b of the circular blade 7 projects in any direction beyond the back-up portion 24a to cut into the object to be cut. Consequently, the circular blade 7 rolls on the object to be cut, while making a slight ~lip .
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~ on the object to be cut. After the use, as the protective .
:: member 23 is automatically retracted to the inoperative position by the resilient force of the leaf spring 29.
As has been described, since the circular blade of the invention is pressed at its portion behind the central bore 7a, the cutting edge 7b on the front side o the circular ; blade 7 is not affected by the pressure exerted by the pressing member so that the object is cut to exhibit a ` linear cut end. At the same time, the pressing member 11 is:always received in the hole 10 ~ormed in the blade ~;. mounting portion 3, while the operating member 14 which : engages with the pressing member 11 through the cam : surfaces 12,21 is positioned on the side of the blade ~` : mounting section 3 opposite to the circular blade 7.
Therefore, these: members 11!14 do not project into the ; outer space EaciLng the cir~cular blade 7 so that the edge 7b of the circular blade 7 is visually~checked easily from the : upper side during the use o the cutter.
Although the inventi~on has been described through ~specific terms, it is to be understood that the described .: embodiment of the invention is not exclusive and various :
changes and modifications may be imparted thereto without :
~i departing from the scope of the invention which is limited -, ~': solely by the appended clalms.
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Claims (7)
1. A cutter having a circular rotary blade comprising:
(a) a handle;
(b) a blade mounting section formed on one end of said handle;
(c) a circular blade secured to one side of said blade mounting section and rotatably carried at its central portion;
(d) a hole having an opening formed in the blade mounting section at a position behind the central portion of said circular blade and corresponding to said circular blade;
(e) a pressing member movably received in said hole and projectable through the opening of the hole into pressure contact with one side of said circular blade; and (f) an operation member adapted to limit the movement of said pressing member so as to adjust the pressure contact between said pressing member and said circular blade, said operation member being held in engagement with said pressing member and positioned on the opposite side of said blade mounting section to said circular blade and further provided with a cam surface formed on the side thereof opposing said circular blade and adapted for engaging a cam surface formed on said pressing member.
(a) a handle;
(b) a blade mounting section formed on one end of said handle;
(c) a circular blade secured to one side of said blade mounting section and rotatably carried at its central portion;
(d) a hole having an opening formed in the blade mounting section at a position behind the central portion of said circular blade and corresponding to said circular blade;
(e) a pressing member movably received in said hole and projectable through the opening of the hole into pressure contact with one side of said circular blade; and (f) an operation member adapted to limit the movement of said pressing member so as to adjust the pressure contact between said pressing member and said circular blade, said operation member being held in engagement with said pressing member and positioned on the opposite side of said blade mounting section to said circular blade and further provided with a cam surface formed on the side thereof opposing said circular blade and adapted for engaging a cam surface formed on said pressing member.
2. A cutter having a circular rotary blade according to claim 1, wherein said blade mounting section has a supporting portion formed on one side thereof and contacting said circular blade and another supporting portion formed on the side thereof opposite to the supporting portion; a supporting hole extended from one to the other of said supporting portions; a stopper screw received in said supporting hole and adapted for supporting said circular disc; and a nut screwed to the end of said stopper screw and contacting said another supporting portion.
3. A cutter having a circular rotary blade according to claim 2, wherein said operation member is provided at its one end with a hole for rotatably receiving said supporting portion, while the other end is provided with a guide projection movably received by a guide groove formed in the blade mounting section and an actuating tab for rotationally operating the opera-tion member.
4. A cutter having a circular rotary blade according to claim 1, wherein said pressing member is provided on the cam surface thereof with a plurality of projections while said operation member is provided in the cam surface thereof with a plurality of recesses 2 with said projections on said pressing member.
5. A cutter having a circular rotary blade comprising:
(a) a handle;
(b) a blade mounting section formed on one end of said handle;
(c) a circular blade secured to one side of said blade mounting section and rotatably carried at its central portion;
(d) a hole having an opening formed in the blade mounting section at a position behind the central portion of said circular blade and corresponding to said circular blade;
(e) a pressing member movably received in said hole and projectable through the opening of the hole into pressure contact with one side of said circular blade;
(f) an operation member adapted to limit the movement of said pressing member so as to adjust the pressure contact between said pressing member and said circular blade, said operation member being held in engagement with said pressing member through cam means and positioned on the opposite side of said blade mounting section to said circular blade;
(g) a protective member adapted to protect the user's finger and so forth from being injured by the edge of said circular blade when the cutter is not being used, said protective member being attached to said handle for movement along the length of said handle; and (h) a recess formed in a portion of said handle for receiving a base portion of said protective member slidably in the longitudinal direction of said handle, said recess being provided at its both sides with a pair of side walls and in the bottom thereof with a guide groove for guiding the base portion of said protective member, while said base portion of said protective member is provided at both sides thereof with a pair of leaf springs adapted to be pressed onto the side walls of said recess, said base portion of said protective member being further provided on the bottom surface thereof with a guide projection movable in the longitudinal direction of a guide groove of the recess and adapted to constitute the center of swinging motion of said protective member.
(a) a handle;
(b) a blade mounting section formed on one end of said handle;
(c) a circular blade secured to one side of said blade mounting section and rotatably carried at its central portion;
(d) a hole having an opening formed in the blade mounting section at a position behind the central portion of said circular blade and corresponding to said circular blade;
(e) a pressing member movably received in said hole and projectable through the opening of the hole into pressure contact with one side of said circular blade;
(f) an operation member adapted to limit the movement of said pressing member so as to adjust the pressure contact between said pressing member and said circular blade, said operation member being held in engagement with said pressing member through cam means and positioned on the opposite side of said blade mounting section to said circular blade;
(g) a protective member adapted to protect the user's finger and so forth from being injured by the edge of said circular blade when the cutter is not being used, said protective member being attached to said handle for movement along the length of said handle; and (h) a recess formed in a portion of said handle for receiving a base portion of said protective member slidably in the longitudinal direction of said handle, said recess being provided at its both sides with a pair of side walls and in the bottom thereof with a guide groove for guiding the base portion of said protective member, while said base portion of said protective member is provided at both sides thereof with a pair of leaf springs adapted to be pressed onto the side walls of said recess, said base portion of said protective member being further provided on the bottom surface thereof with a guide projection movable in the longitudinal direction of a guide groove of the recess and adapted to constitute the center of swinging motion of said protective member.
6. A cutter having a circular rotary blade according to claim 5, wherein said base portion of said protective member is further provided on the bottom surface thereof with a pair of ridges formed at both sides of said guide projection and extending in the longitudinal direction of said base portion, said ridges contacting the bottom surface of said recess, said base portion of said protective member being further provided with a spring member secured to one end thereof and adapted to urge said protecting member as a whole always towards the end of said handle adjacent to said disc portion of said protective member.
7. A cutter having a circular rotary blade according to claim 6, wherein a cover for covering the base portion of said protective member is disposed to overlie said recess in said handle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000506400A CA1261601A (en) | 1986-04-11 | 1986-04-11 | Cutter having circular rotary blade |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000506400A CA1261601A (en) | 1986-04-11 | 1986-04-11 | Cutter having circular rotary blade |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1261601A true CA1261601A (en) | 1989-09-26 |
Family
ID=4132859
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000506400A Expired CA1261601A (en) | 1986-04-11 | 1986-04-11 | Cutter having circular rotary blade |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1261601A (en) |
-
1986
- 1986-04-11 CA CA000506400A patent/CA1261601A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |