Knife with extensible blade

Abstract

A knife with an extensible blade is formed by a handle that defines a cavity in which the blade is placed. The cavity is open at least on the side adjacent to the blade tip. In the cavity, at least one guiding groove is formed, which guiding groove is blind near the front edge of the handle. The blade is equipped with at least one guiding member corresponding with the guiding groove of the handle. The handle cavity is further equipped with a pull-out groove. A pulling element that selectively connects to the blade leads through and protrudes out of the pull-out groove when the blade is in a retracted position.

Claims

1. A knife having an extensible blade, the knife comprising: a handle having: a front end, a back end, an exterior, and a handle cavity that is located inside the handle, wherein the handle cavity is open at least at the front end of the handle, the handle cavity defining: a guiding groove extending from a first location toward the back end of the handle to a second location toward the front end of the handle, wherein the guiding groove comprises a stop toward the front end of the handle; and a pull-out groove that extends along a length of the handle and that is open at least at the front end of the handle; and a blade with a point, a blunt end, a guiding member that corresponds in shape, size, and position with the guiding groove; a connecting member on the blade that corresponds in position with the pull-out groove, wherein the connecting member is placed closer to the point of the blade than is the guiding member with respect to the point of the blade; a pulling element that is equipped at one end with a joint member, wherein the joint member is equipped with a connecting element that is selectively connectable with the connecting member of the blade, wherein the joint member further corresponds in shape, size, and position with the pull-out groove, and wherein the pulling element is configured to extend through the pull-out groove out from the handle when the blade is in a retracted position; a locking bed that is parallel to the length of the handle, the locking bed having an open receiving end that is perpendicular to the length of the handle; and a rotary controller that comprises a rod-shaped, rotary-pivoted element that lies in the locking bed, and a manipulator that lies at a right angle to the rod-shaped, rotary-pivoted element, wherein the manipulator extends beyond the handle for selectively locking and unlocking the blade in the retracted position.

2. The knife according to claim 1, wherein in the knife further comprises a safety lock comprising a locking pressure element configured to lock the blade in an extended position.

3. The knife according to claim 2, wherein the handle cavity extends through the whole length of the handle, thereby defining a first opening and a second opening, wherein the handle cavity further defines a stopping groove which is open at the first opening and blind at the second opening; and wherein the blade further comprises a stop element which corresponds with the stopping groove, thereby preventing the blade from sliding out the second opening.

4. The knife according to claim 2, wherein the pulling element comprises a flexible rollable material.

5. The knife according to claim 1, wherein the handle cavity extends through an entire length of the handle, thereby defining a first opening and a second opening, wherein the handle cavity further defines a stopping groove which is open at the first opening and blind at the second opening; and wherein the blade further comprises a stop element which corresponds with the stopping groove, thereby preventing the blade from sliding out the second opening.

6. The knife according to claim 5, wherein the pulling element comprises a flexible rollable material.

7. The knife according to claim 5, wherein the blade is at least as long as the handle such that when the blade is in the retracted position, the blunt end of the blade extends into the second opening of the handle cavity.

8. The knife according to claim 1, wherein the knife further comprises a locking pressure member; and wherein the rotary controller further comprises a locking member that can interact with the locking pressure member to selectively lock the blade in the retracted position.

9. The knife according to claim 8, wherein the pulling element comprises a flexible rollable material.

10. The knife according to claim 1, wherein the rotary controller further comprises a locking pin; and wherein the blade defines a lock notch, wherein the locking pin can interact with the lock notch to selectively lock the blade in the retracted position.

11. The knife according to claim 10, wherein the pulling element comprises a flexible rollable material.

12. The knife according to claim 1, wherein the pulling element comprises a flexible rollable material.

Description

DESCRIPTION OF THE DRAWINGS

(1) The particular designs of the invention are schematically illustrated in following drawings where:

(2) FIG. 1 is a side view of the knife with an extensible blade from the side of a locking part of the handle in position with retracted blade

(3) FIG. 2 is a transversal section of the handle of the knife in perpendicular plane to projection of FIG. 1 which is done along the line A-A

(4) FIG. 3 is a lengthwise section of the knife in the position with retracted blade in perpendicular plane to projection of FIG. 1 which is done along the line B-B

(5) FIG. 4 is a lengthwise section of the handle of the knife in perpendicular plane to projection of FIG. 1 which is done along the line C-C

(6) FIG. 5 is a lengthwise section of the handle of the knife in perpendicular plane to projection of FIG. 1 which is done along the line D-D

(7) FIG. 6a is a lengthwise section of the knife in the plane which is perpendicular to projection of FIG. 1 done along the line E-E in position with retracted blade and a sliding lock in locked position

(8) FIG. 6b is a lengthwise section of the knife in the plane which is perpendicular to projection of FIG. 1 done along the line E-E in position with retracted blade and a sliding lock in unlocked position

(9) FIG. 7a is a lengthwise section of the knife in the plane which is perpendicular to projection of FIG. 1 done along the line F-F in position with retracted blade and the sliding lock in locked position

(10) FIG. 7b is a lengthwise section of the knife in the plane which is perpendicular to projection of FIG. 1 done along the line F-F in position with retracted blade and the sliding lock in unlocked position

(11) FIG. 8 is a side view of the knife with extensible blade from the side of locking part of the handle in position with extended blade

(12) FIG. 9 is a lengthwise section of the knife in the position with extended blade in perpendicular plane to projection of FIG. 8 which is done along the line B-B

(13) FIG. 10 is a transversal section of the blade of the knife in plane which is perpendicular to the lengthwise axis of the knife with an alternative positioning of the sliding lock, guiding groove and lock bed

(14) FIG. 11 is an alternative design of the lock bed with a rotary controller in locked position and with retracted blade

(15) FIG. 12 is an alternative design of the lock bed with the rotary controller in unlocked position and with extended blade

(16) FIG. 13a is a lengthwise section of the knife in the plane which is perpendicular to projection of FIG. 11 done along the line E-E in position with retracted blade and the rotary controller in locked position

(17) FIG. 13b is a lengthwise section of the knife in the plane which is perpendicular to projection of FIG. 11 done along the line E-E in position with retracted blade and the rotary controller in unlocked position

(18) FIG. 14 is another alternative design of the lock bed with the rotary controller with blade in retracted position

(19) FIG. 15a is a lengthwise section of the knife in the plane which is perpendicular to projection of FIG. 14 done along the line E-E in position with retracted blade and the rotary controller in locked position

(20) FIG. 15b is a lengthwise section of the knife in the plane which is perpendicular to projection of FIG. 14 done along the line E-E in position with retracted blade and the rotary controller in unlocked position

(21) FIG. 16 is the knife from FIG. 14 with extended blade

(22) FIG. 17 is an alternative position of the lock bed with the rotary controller from FIG. 14

(23) FIG. 18 is an alternative design of the knife with blade completely hidden in the handle

(24) FIG. 19 is a transversal section of the handle in the perpendicular plane to the projection of FIG. 18 done long the line A-A

(25) FIG. 20 is a lengthwise section of the knife in perpendicular plane to the projection of FIG. 18 done along the line B-B

(26) FIG. 21 is the knife from FIG. 18 with extended blade

(27) FIG. 22 is a lengthwise section of the knife in perpendicular plane to projection of FIG. 21 done along the line B-B

(28) The drawings which illustrate presented invention and below described examples of particular design do not in any case anyhow limit the extend of the protection mentioned in the definition yet merely clarify essence of the invention.

DETAILED DESCRIPTION OF EMBODIMENTS OF THE INVENTION

(29) The knife with extensible blade in its basic design illustrated in FIG. 1 consists of a lengthwise divided handle 1 which is formed with a locking part 11 and a guiding part 12 which are mutually fixed to each other. There is the lengthwise direction in the handle 1 between the locking part 11 and the guiding part 12 formed a passable handle cavity 13 in which is slidably placed a flat blade 2 which has not only a blunt edge 21 but also a point 22.

(30) In inner area of the handle cavity 13 is in the direction of the lengthwise axis of the knife formed not only a passable pull out groove 121 but also 2 guiding grooves 122 which are in direction toward the blunt edge 21 of the blade 2 in the lengthwise direction open and in the direction toward the point 22 are blind (e.g., comprise a stop 123) in front of the end of the handle 1. In the locking part 11 of the handle 1 is from its inner part which forms a inner surface of the handle cavity 13 in direction of the lengthwise axis of the knife formed a retractable groove 111 which is in direction toward the point 22 of the blade 2 in its retracted position open and in direction to the blunt edge 21 of the blade 2 is blind in front of the end of the handle 1.

(31) The blade 2 is in its end part of the blunt edge 21 on its surface equipped with 2 guiding members 201 which correspond in size and shape with transversal cross section of the guiding grooves 122 whereas the guiding members 201 are on the transversal cross section of the blade 2 placed in the same position in which to the transversal cross section of the blade adjoin the guiding grooves 122. The blade is further equipped with a stop element 202 whose distance from the blunt edge 21 of the blade 2 corresponds with the difference of the whole length of the body of the knife with retracted blade 2 and the length of the retractable groove 111. Position of the stop element 202 on the transversal cross section of the blade is given by the spot to which to the transversal cross section of the blade 2 adjoins the retractable groove 111. In the area between the guiding members 201 and the stop element 202 is the blade 2 equipped with a connecting member 203 which is formed preferably as a recess or an opening in the surface of the blade 2. Position of the connecting member 203 on the transversal cross section of the blade corresponds with the spot to which to the transversal section of the blade adjoins the lengthwise axis of the pull out groove 121.

(32) A part of the knife with extensible blade is an extensible module 3 which is formed with a linear pulling element 31 preferably made of a flexible rollable material which is at its one end equipped with a fixture element 32 preferably a snap hook and at its second end with a joint member 33 which is equipped with a connecting element 331 preferably a pin. The connecting element 331 is compatible with the connecting member 203 of the blade 2 with which forms connectable and at the same time easily disconnectable couple of counterparts. The joint member 33 corresponds in size and shape with the transversal inner cross section of the pull out groove 121 in which is placed when the blade 2 is retracted whereas the connecting element 331 is then connected with the connecting member 203 and the pulling element 31 is then taken through the pull out groove 121 out from the handle 1.

(33) In the locking part 11 of the handle 1 is in the perpendicular direction to the lengthwise axis of the knife formed a locking hole 112 directed into the handle cavity 13. The distance of the locking hole 112 from the rim of the handle to which heads the point 22 of the blade 2 is given by sum of distances of the blind ends of the guiding grooves 122 from the rim of the handle 1 and the distance of the guiding member 201 from the blunt edge 21 of the blade 2. Through the locking hole 112 goes a safety lock 113 which is on the outer part of the knife fixed on the free end of the flat locking pressure member 114 which is made of a springy material and is fixed by its second end flat on the outer surface of the locking part 11 of the handle 1.

(34) The locking pressure member 114, in the direction of the lengthwise axis of the knife, outreaches the rim of the handle 1. The safety lock 113, when the blade 2 is extended, reaches into the space of the handle cavity 13 and is adjacent to the blunt edge 21 of the blade 2.

(35) On the outer surface of the locking part 11 of the handle 1 is in the direction of the lengthwise axis of the knife formed a lock bed 14 in the shape of an elongated recess whose ends are also right angle open to its lengthwise axis in the direction out from the handle 1 in an axis which is parallel with the surface of the blade 2. The end part of the lock bed 14 which is closer to the blunt edge of the blade 2 is in its retracted position overlaid with the free end of the flat locking pressure element 133 which is made of springy material which is by its second end fixed flat to the surface of the locking part 11 of the handle 1. Under the free end of the locking pressure element 133 is in the handle 1 in the perpendicular direction to the lengthwise axis of the knife formed a lock passage 131 leading to the handle cavity 13 whose position corresponds with the locking hole 23 which is formed in the blade 2 when the blade 2 is retracted. When the blade 2 is retracted into the locking hole 23 interlocks the lock pin 132 which further goes through the lock passage 131 and which is on the outer part of the knife fixed to the locking pressure element 133.

(36) In the lock bed 14 is pivoted a rod shaped rotary controller 141 with a circular cross section which is equipped at the distant end from the locking pressure element 133 with a manipulator 134 designed as a right angle curvature to the lengthwise axis of the rotary controller 141 whereas the manipulator 134 overreaches the outer outlines of the knife. On the opposed end the rotary controller 141 in the lock bed 14 reaches under the locking pressure element 133 and is at this end equipped with an excenter 142.

(37) Position of the retractable groove 111 in the locking part 11 of the handle 1, the guiding grooves 122 in the guiding part 12 of the handle 1 a position of the lock bed 14 with the rotary controller 141 and the locking pressure element 133 on the guiding part 12 is not only possible design. In an alternative design which is illustrated in FIG. 10 is the retractable groove 111 placed in the locking part 11, one guiding groove 122 is placed in the locking part 11 and one guiding groove 122 is placed in the guiding part 12 and the lock bed 14 with the rotary controller 141 and the locking pressure element 133 is placed on the guiding part 12 of the handle 1.

(38) Another alternative design which is illustrated in FIGS. 11, 12 and 13 is design of the lock bed 14 with the rotary controller 141 and the locking pressure element 133 on the guiding part 12 of the handle 1. There is the rotary controller 141 on its closer end to the blunt edge 21 of the blade 2 in its retracted position equipped with a locking pin 143 which forms a right angle not only with the lengthwise axis of the rotary controller 141 but also with the axis of the manipulator 134. In the handle 1 is in this design at the end of the lock bed 14 which is closer to the blunt edge 21 of the blade 2 in its retracted position formed a lock cavity 135 which reaches into the handle cavity 13 and which in size and position corresponds with the locking pin 143 which in the locked position interlocks in a lock notch 24. The locking pressure element 133 is in this design fixed to the surface of the handle 1 at both ends.

(39) Another variant of the design is illustrated in FIGS. 14, 15 and 16 when the lock bed 14 is designed as a lengthwise closed cavity which goes through body of the handle 1 in the parallel axis with the lengthwise axis of the knife. The lock bed 14 is at the end which is closer to the point 22 of the blade 2 in its retracted position open out from the handle 1 into the plane which is perpendicular to its lengthwise axis namely in the extent of the angle at least 90°. At its second end which is closer to the blunt edge 21 of the blade 2 when retracted, the lock bed 14 leads to the lock cavity 135 which is formed inside of the body of the handle 1 in the plane which is perpendicular to the lengthwise axis of the lock bed 14 and which leads into the handle cavity 13. In the lock bed 14 is placed a rotary controller 141 which is at its one end equipped with a manipulator 134 which is taken out from the handle 1 and at its second end with a locking pin 143 which goes into a lock cavity 135 which is modified to the shape and size of the locking pin 143. The manipulator 134 and the locking pin 143 are formed as a right angle curvature forming mutually 90° angle. Alternatively can be the lock bed 14 with the rotary controller 141 and the locking cavity 135 placed on opposed part of the handle 1 or on the same part of the handle 1 as is it illustrated in FIG. 17.

(40) In an alternative design—illustrated in FIGS. 18, 19 and 20 the knife is not equipped with a lock bed 14, a rotary controller 141, a locking pressure element 133, a locking passage 131, a locking hole 23 and also a locking pin 132. In this design the knife does not contain a retractable groove 111 and at the same time a handle cavity 13 is concurrently with the end of the blade 2 in its retracted position blind together with it are blind also guiding grooves 122.

(41) In this design is the joint member 33 made as a steel wire which is at its end right angle curved where the connecting element 331 is formed by this curved part of the wire.

(42) In a basic standby mode is the knife fixed on the body of a bearer and the pulling element 31 is either by the help of a fixture element 32 firmly fixed or simply tied with the fixture spot on the body of the bearer. The blade 2 is retracted in the handle cavity 13 when the stop element 202 is at the end of the retractable groove 111 in the place of its blind and the side of the blunt edge 21 of the blade 2 exceeds in the lengthwise direction out from the handle 1. Alternatively the blade 2 is completely retracted to the blind of the handle cavity 13. The pulling element 31 is from the body of the bearer led in direction from the point 22 through pull out groove 121 of the handle 1 to its second part where is by the help of the joint member 33 which is situated from bigger part in the pull out groove 121 and the connecting element 331 fixed to the blade 2 by the help of its connecting member 203 which together with the connecting element 331 forms a compatible couple of counterparts pin-hole. Locking of the connecting element 331 in the pull out groove 121 ensures their connection. The rotary controller 141 is in the position when the excenter 142 has its wider part directed into the parallel direction with the plane of the blade 2 and does not lift the lock pressure element 133 thus the lock pin 132 which goes through the lock passage 131 interlocks in the locking hole 23 of the blade 2. Alternatively the locking pin 143 goes through the locking cavity 135 and goes to the space of the handle cavity 13 where interlocks in the lock notch 24 of the blade 2 which is thereby locked in retracted position. By rotation of the rotary controller 141 by the help of movement of the manipulator 134 there comes to change of the position of the excenter 142 which will then be positioned with its wide part to flat locking pressure element 133 whereby lifts its free end with fixed locking pin 132 which thus goes from the space of the handle cavity 13 and the blade 2 is unlocked. Alternatively there comes, by rotation of the rotary controller 141, to tilt of the locking pin 143 from the space of the handle cavity 13 and also from the lock notch 24 and the blade 2 is unlocked. Next movement of the handle 1 in direction away from the body of the bearer comes to formation of pulling force which acts through the pulling element 31 on the blade 2 which extends out from the handle 1 whereas the guiding members 201 during this movement go through the guiding grooves 122 and stops when hits the blinds and thereby is terminated movement of the blade 2. In this moment the safety lock 113 pressured in direction toward the blade 2 by the locking pressure member 114 locks behind the blunt edge 21 of the blade 2 which is this way locked in the extended position.

(43) In the final phase of this movement of the blade 2 comes to spontaneous disconnection of the connecting member 203 and the connecting element 331 as a result of pull-out of the joint member 33 from the pull out groove 121.

(44) The knife with extensible blade is suitable especially for situations where is necessary by the help of a quick intuitive movement to grab the self-defense mean of cutting and stabbing type which is directly by this movement immediately ready to use and therefore is designed either for self-defense purposes of the civilians or organized armed units.