Grip-type cutter knife

Abstract

A cutter knife body having a grip portion, the grip portion including a trigger lever, a cutting blade provided on an end of the cutter knife body, a pin rotatably supporting the cutting blade in the cutter knife body, a locking member placed in an opening formed in the cutter knife body, and a pair of cutting blade protector flanges, each protector flange being disposed on a side of the cutting blade, each cutting blade protector flanges having an outward protrusion from a surface of the flange, the grip type cutter knife including a pair of springs located between the pin and each of the outward protrusion from the flange surface, the pair of flanges being slidably supported in the cutter knife body by the pin and the pair of springs.

Claims

1. A grip type cutter knife, comprising: a cutter knife body having a grip portion, wherein the grip portion comprises a trigger lever, a cutting blade provided on an end of the cutter knife body, a pin rotatably supporting the cutting blade in the cutter knife body, a locking member placed in an opening formed in the cutter knife body, a pair of cutting blade protector flanges, each protector flange being disposed on a side of the cutting blade, wherein each of said pair of cutting blade protector flanges has an outward protrusion from a surface of the flange, and a pair of springs located between the pin and each of the outward protrusions from the flange surface, wherein each spring of said pair of springs is located between the pin and one of the outward protrusions, wherein the pair of cutting blade protector flanges is slidably supported in the cutter knife body by the pin and the pair of springs, and wherein a circumference of each of said pair of cutting blade protector flanges comprises a circular portion and a flat bottom portion for contact with a material to be cut, the flat bottom portion coextensive with the circular portion and extending in a direction perpendicular to a rotational axis of the cutting blade.

2. The grip type cutter knife according to claim 1, wherein the cutter knife body comprises a platform, and wherein the cutting blade and the pair of cutting blade protector flanges are disposed on said platform.

3. The grip type cutter knife according to claim 2, wherein said platform comprises an elongated circular opening for allowing the cutting blade and the cutting blade protector flanges to slide outwards from the cutter knife body.

4. The grip type cutter knife according to claim 1, wherein each of said outward protrusions supports a first extremity of each of said pair of springs.

5. The grip type cutter knife according to claim 1, wherein a second extremity of each of said pair of springs impinges upon said pin.

6. The grip cutter knife according to claim 1, wherein the cutter knife body has a guiding cavity with an opening towards said platform, wherein each of said pair of cutting blade protector flanges has a guiding pin extending out in said cavity, and wherein each of the guiding pins of the cutting blade protector flanges is capable of translational movement within said guiding cavity.

7. The grip knife according to claim 1, further comprising: a closing plate having a sliding channel, wherein a first extremity of said pin is capable of executing a translational sliding motion in said sliding channel.

8. The grip knife according to claim 1, further comprising a clip and washer assembly to secure to the grip knife a second extremity of said pin.

9. The grip knife according to claim 1, wherein a circumference of the cutting blade is smaller than the circumference of each cutting blade protector flange.

10. The grip knife according to claim 1, wherein the circumference of each of said flanges further comprising a flat vertical portion which extends perpendicular to the flat bottom portion.

11. The grip knife according to claim 1, wherein the pair of cutting blade protector flanges are asymmetrical.

12. A grip type cutter knife, comprising: a cutter knife body having a grip portion, wherein the grip portion comprises a trigger lever, a cutting blade provided on an end of the cutter knife body, a pin rotatably supporting the cutting blade in the cutter knife body, a locking member placed in an opening formed in the cutter knife body, a pair of cutting blade protector flanges, each protector flange being disposed on a side of the cutting blade, wherein each of said pair of cutting blade protector flanges has an outward protrusion from a surface of the flange, and a pair of springs located between the pin and each of the outward protrusions from the flange surface, wherein each spring of said pair of springs is located between the pin and one of the outward protrusions, wherein the pair of flanges is slidably supported in the cutter knife body by the pin and the pair of springs, and wherein an outer perimeter of each of the pair of cutting blade protecting flanges comprises a flat bottom portion extending in a direction perpendicular to a rotational axis of the cutting blade for contact with a material to be cut and a flat vertical portion extending away from the flat bottom portion, such that the flat bottom portion and the flat vertical portion of each flange form an 90 degree angle.

13. The grip knife according to claim 12, wherein the pair of cutting blade protector flanges are asymmetrical.

14. A grip type cutter knife, comprising: a cutter knife body having a grip portion, wherein the grip portion comprises a trigger lever, a cutting blade provided on an end of the cutter knife body, a pin rotatably supporting the cutting blade in the cutter knife body, a locking member placed in an opening formed in the cutter knife body, a pair of cutting blade protector flanges, each protector flange being disposed on a side of the cutting blade, wherein each of said pair of cutting blade protector flanges has an outward protrusion from a surface of the flange, and a pair of springs located between the pin and each of the outward protrusions from the flange surface, wherein the pair of flanges is slidably supported in the cutter knife body by the pin and the pair of springs, wherein each spring of said pair of springs is located between the pin and one of the outward protrusions, and wherein a circumference of each of the pair of cutting blade protecting flanges has a protruding square edge region such that the cutting blade protector flanges intervene between the cutting blade and an obstacle that may be encountered between the cutting blade protector flanges and the cutting blade, wherein the protruding square edge region of each of the pair of cutting blade protecting flanges comprises a flat bottom portion extending in a direction perpendicular to a rotational of the cutting blade for contact with a material to be cut and a flat vertical portion extending away from the flat bottom portion, such that the flat bottom portion and the flat vertical portion of each flange form a 90 degree angle.

15. The grip knife according to claim 14, wherein the pair of cutting blade protector flanges are asymmetrical.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Embodiments and modifications of the present invention will now be described with reference to the accompanying drawings, in which, as mentioned above:

(2) FIGS. 1 and 2 represent a conventional grip-type cutter knife;

(3) FIGS. 3 to 5 are perspective views showing another example of a conventionally known cutter knife, and

(4) FIG. 6 is a front view showing the grip type cutter knife, in accordance with the present invention;

(5) FIG. 7 is a sectional view of the grip type cutter knife of the present invention, and

(6) FIG. 8 is an exploded view of the grip type cutter knife of the present invention.

(7) The accompanying drawings are included to provide a further understanding of embodiments of the present invention. The drawings illustrate the embodiments and together with the description serve to explain principles of the present invention. Other embodiments and many of the intended advantages of the embodiments will be readily appreciated as they become better understood by reference to the following detailed description. The elements of the drawings are not necessarily scaled relative to each other. Similar reference numerals may be used to designate corresponding similar parts in distinct embodiments. Features of the various exemplary embodiments described herein may be readily combined with each other, unless specifically noted otherwise.

DETAILED DESCRIPTION OF THE EMBODIMENTS

(8) Referring now to the illustration of FIG. 6, FIG. 6 is a front view showing the grip type cutter knife, in accordance with the present invention.

(9) The grip type cutter knife 600 of the present invention is shown in FIG. 6 as having an elongated cutter body 602 provided with a grip portion, having a trigger lever 604. A push type lock button 606 is provided on the grip type cutter knife. At the front end of the elongated cutter body 602 is provided a region 608 comprising a platform (not shown in the figure). As it may be further observed in FIG. 6, the grip type cutter knife 600 comprises a pair of flanges 610 and 612 and a cutting blade 614 disposed on the platform. The assembly of flange 610, cutting blade 614 and flange 612 are secured to the grip type cutter knife 600 via a closing plate 616 that may exhibit a logo 618. The grip type cutter knife 600 is illustrated in FIG. 6 in a rest position, while the trigger lever 604 is not gripped by a user and the cutting blade 614 and the cutting blade protector flanges 610 and 612 are in a non-cutting position, and the position of the push type lock button 606 is assumed to be in a locking position.

(10) Referring now to the illustration of FIG. 7, FIG. 7 is a sectional view of the grip type cutter knife 600 of the present invention. The view of FIG. 7 may be obtained for example along the exemplary section line AA of FIG. 6.

(11) As mentioned above and as it may be observed in FIG. 7, at the front end of the elongated cutter body 602 is provided a region 608 comprising a recessed region that forms a platform 702. The platform 702 comprises an elongated circular opening for allowing the cutting blade 614 and the cutting blade protector flanges 610 and 612 to slide outwards from the cutter knife body.

(12) As it may be further observed in FIG. 7 an assembly formed by the cutter blade 614 and a pair of cutting blade protector flanges 610 and 612 is disposed on the platform 702. Each protector flange 610 and 612 is disposed on a side of the cutting blade 614, for example one protector flange 612 being disposed in the region comprised between the surface of platform 702 and the cutting blade 614, and the second protector flange 610 is disposed in the region between the cutting blade 614 and the closing plate 616.

(13) A pin 704 is further provided in the grip type cutter knife 600, the pin 704 rotatably supporting the cutting blade 614 in the grip type cutter knife 600. The pin 704 has a first extremity of the pin being oriented from the cutting blade 614 towards the closing plate 616, and a second extremity being oriented from the cutting blade 614 towards the a back portion of the region 608, region not available for the viewer in the view of the invention illustrated in FIG. 6.

(14) The pin 704 is secured via its second extremity to the back portion of the region 608 via a clip 706 and a washer 708. The first extremity of the pin is guided within the closing plate 616 that, as it will be shown later, comprises a sliding channel, the first extremity of the pin being able to slide along the channel of the closing plate 616.

(15) The illustration of FIG. 7 further reveals that each cutting blade protector flange 610 and 612 disposed on each side of the cutting blade 614 exhibits an outward protrusion 712 from the surface of the flange, protrusion that may be exemplarily implemented via a screw head. A spring 710 extends from each protrusion 712 to the pin 704 on each cutting blade protector flange 610, the spring 710 being exemplarily united to the pin as well via a screw head. As illustrated in FIG. 7 each of said outward protrusion 712 supports a first extremity of each spring 710 and a second extremity of each of spring impinges upon said pin.

(16) FIG. 8 is an exploded view of the grip type cutter knife 600 of the present invention.

(17) The view of the present invention explained in connection with FIG. 8 will be assumed to range from the left side of the figure in the direction of the arrow towards the right side of the figure.

(18) In accordance with the representation provided in FIG. 8 the grip type cutter knife 600 of the present invention comprises a clip 706 and a washer 708 that secure the second extremity of pin 704 to a region 608 of the elongated cutter body 602 of the grip type cutter knife 600. Although not illustrated in the figure the extremity of the pin 704 secured by the clip and washer assembly 706 and 708 is capable of translational upward downward movement in a direction perpendicular to the axis 800.

(19) The front end of the elongated cutter body 602 is provided a region 608 comprising a platform 702. The platform 702 comprises an elongated circular opening for allowing the cutting blade 614 and the cutting blade protector flanges 610 and 612 to slide outwards from the cutter knife body. A through slot 802 of partially circular, elongated shape (not shown) is provided in the cutter knife body to allow the extremity of the pin to protrude through the region 608 of the elongated cutter body 602 of the grip type cutter knife 600. Further, the through slot 802 facilitates the translational upward downward movement in a direction perpendicular to the axis 800 of the pin through the body of platform 702.

(20) The cutter knife body has a guiding cavity (not shown in the figure) with an opening 804 in towards the platform 702.

(21) Directly in contact with the surface of the platform 702 is disposed a flange 612 that is represented in the figure as having an elongated central through slot and a guiding pin 806 protruding outward from the perimeter of the flange. The outer perimeter of the flange is circular, with a flat bottom portion in the vicinity of the flange that comes in contact with a material to be cut, and a flat vertical portion in a portion of the flange extending away from the flat bottom portion, the flat bottom portion and the flat vertical portion of the flange forming a 90 degrees angle. The flange 612 is represented with the portion shaped to firm 90 degrees between its two sections oriented towards the viewer.

(22) The guiding pin 806 is extending out from the perimeter of the flange into the guiding cavity 804, for guiding a translational movement of the flange 612 along a longitudinal axis of the spring 710.

(23) A cutting blade 614 is disposed between two subsequent flanges, the blade being circular and having a radius that is slightly smaller than the radius of the flanges 612 and 610. Further, the circular blade 614 has a circular slot that affixes the cutting blade to the pin 704. The second flange 610 is placed in the view of FIG. 8 after the cutting blade 614, with the portion shaped to form 90 degrees between its two sections oriented away from the viewer. Both flanges 610 and 614 have an outward protrusion 712 from the surface of the flange, protrusion that may be exemplarily implemented via a screw head. A spring 710 extends from each protrusion 712 to the pin 704 on each cutting blade protector flange 610 and 614, the spring 710 being exemplarily united to the pin as well via a screw head. As illustrated in FIG. 7 each of said outward protrusion 712 supports a first extremity of each spring 710 and a second extremity of each of spring impinges upon said pin.

(24) A pin 704 is as well represented in FIG. 8. The person skilled in the art, viewing the representation of FIG. 8 would be aware that this representation is not to scale and the pin's dimensions are not truly represented in FIG. 8. The pin 704 is longer and as discussed in detail above, extends from the clip 706 to the closing plate 616. The closing plate 616 has a sliding channel (not shown in the figure), and a first extremity of pin 704 is capable of executing a translational sliding motion in the channel.

(25) Prior to being in use the grip type cutter knife 600 of the present invention may be stored in a rest position that entails at least that trigger lever 604 protrudes from the handle of the knife and is arrested in this position via the push type lock button 606. In this position the cutting bladeflange assembly is as well in the rest position, on the platform 702 that comprises the elongated circular opening for allowing the cutting blade 614 and the cutting blade protector flanges 610 and 612 to slide outwards from the cutter knife body. No further details will be provided in this document regarding the mechanism involved in arresting the trigger lever 604 in the rest or locked position, since said details are known to the person skilled in the art. Due to the pressure exerted by the springs the flanges are resting in a position that completely covers the blade. As described above, the two flanges are not symmetrical.

(26) The grip type cutter knife 600 of the present invention may be used by a user by gripping the handle 602, releasing the push type lock button 606 and pressing the trigger lever 604. Alternatively, the user may, via the push lock button 606, maintain the trigger lever inside the handle. In either case, the cutting wheelflange assembly will be released into an unlocking position, and it will be lowered from the rest position to a cutting position. During the cutting operation of a material a drawing force is applied to the handle to move the cutting wheelflange assembly on the material to be cat along the intended line of cutting while the handle is concurrently downwardly pressed by the application of a slight pressing force to the handle. As a result the flanges are brought in contact with the surface of the material to be cut that is presumably resting on a resilient surface. Due to the downward pressing force the springs associated with the flanges are inwardly compressed. Upon the application of further pressing force that is equal or larger than the resistance generated by the compressed springs the blade that has smaller radius than the flanges, will come in contact with the material to be cut. While descending from a locked position into the unlocking position, the cutting wheel flange assembly is guided along a predetermined descent direction by the guiding pins 806 that are lowered in the channel 804. Should an obstacle appear along the cutting line, either in front of the grip type cutter knife and after the grip type cutter knife, the obstacle will come in contact first with either one of the pair of flanges 610 and 612 and will prevent the cutting blade 614 to come in contact with the obstacle. Should the obstacle be the finger of the operator, as it often occurs due to the unsafe operation of the knife by the operator, the fingers are protected from coming in contact with the cutting blade 614 since the operator's finger comes first in contact with the edge of either one of flanges 610 or 612. As such, the present invention provides for the safe operation of the grip type cutter knife.

(27) Alternatively to the above, since the two cutting blade protector flanges operate independently from each other, dependent on the direction of primary motion a flange may mask the blade while the other flange releases the blade.

(28) Although the present invention has fully been described by way of the preferred embodiments thereof, it is to be noted that various changes and modifications are apparent to those skilled in the art. Accordingly, unless such changes and modifications depart from the true scope of the present invention, they should be construed as included therein.