The present invention generally involves a pocket knife. In particular embodiments, the pocket knife may be a double action, out-the-front configuration.
Pocket knives provide a convenient tool for cutting that may be easily carried by a user for deployment when desired. For some pocket knife designs, two hands are needed to deploy and retract a blade, while other designs include a spring that assists a user to deploy and/or retract the blade using a single hand. Each design balances the convenience and speed of operation with increased risk associated with inadvertent operation.
A switchblade is a particular style of pocket knife that has a folding or sliding blade that automatically deploys when an actuator is operated. A single action switchblade typically includes a spring under tension with the blade when the blade is retracted, and operation of the actuator releases the blade to allow the spring tension to automatically deploy the blade. Once deployed, the actuator is released to engage a lock that holds the blade in the deployed position. To retract a single action switchblade, the actuator is again operated to disengage the lock, and the blade must be manually retracted against the spring tension.
In contrast, a double action switchblade typically includes a slider, front and rear operators connected by a spring, and front and rear locks. To deploy a double action switchblade, the actuator may be moved forward to move the slider forward. Forward movement of the slider moves the front operator forward while the rear operator is engaged with the rear of the blade to charge the spring. Forward movement of the slider eventually releases the rear lock to allow the charged spring to deploy the blade, and the front lock engages with the deployed blade to hold the blade in the deployed position. To retract a double action switchblade, the actuator is moved rearward to move the slider rearward. Rearward movement of the slider moves the rear operator rearward while the front operator is engaged with the blade to charge the spring. Rearward movement of the slider eventually releases the front lock to allow the charged spring to retract the blade, and the rear lock engages with the retracted blade to hold the blade in the retracted position.
Although a double action switchblade often provides convenient one-handed operation, the amount of force needed to move the actuator to adequately charge the spring to deploy and retract the blade may be difficult for some users. In addition, manufacturing tolerances in the spring may vary the amount of force required to move the actuator and/or reliability of operation. For example, a spring with a higher modulus of elasticity increases the amount of force required to move the actuator, making operation of the switchblade more difficult. Conversely, a spring with a lower modulus of elasticity decreases the amount of force required to move the actuator, making operation of the switchblade less difficult. However, the reduced force applied to the spring may not adequately charge the spring to reliably deploy and retract the blade. Therefore, the need exists for an improved switchblade that may be comfortably operated one-handed while accommodating manufacturing tolerances in the spring.
Aspects and advantages of the invention are set forth below in the following description, or may be obvious from the description, or may be learned through practice of the invention.
One embodiment of the present invention is a pocket knife that includes a chassis that defines a left outer surface opposed to a right outer surface, a top outer surface between the left and right outer surfaces, and a cavity between the left and right outer surfaces. A blade having a cutting edge has a retracted position in which the cutting edge is inside the cavity and a deployed position in which the cutting edge is outside of the cavity. An actuator in sliding contact with the chassis has a shut position that moves the blade to the retracted position and an open position that moves the blade to the deployed position. A left side of the actuator extends beyond the left outer surface of the chassis. A right side of the actuator opposed to the left side of the actuator extends beyond the right outer surface of the chassis. A top side of the actuator between the left and right sides of the actuator extends beyond the top outer surface of the chassis.
An alternate embodiment of the present invention is a pocket knife that includes a chassis that defines a left outer surface opposed to a right outer surface, a top outer surface between the left and right outer surfaces, and a cavity between the left and right outer surfaces. A blade having a cutting edge has a retracted position in which the cutting edge is inside the cavity and a deployed position in which the cutting edge is outside of the cavity. A slider inside the cavity has a rear position that moves the blade to the retracted position and a front position that moves the blade to the deployed position. A tab extends from the slider, and an actuator is in sliding contact with the chassis and engaged with the tab so that the actuator and the slider move together. At least one of a left side of the actuator extends beyond the left outer surface of the chassis or a right side of the actuator extends beyond the right outer surface of the chassis.
In yet another embodiment of the present invention, a pocket knife includes a chassis that defines a left outer surface opposed to a right outer surface, a top outer surface between the left and right outer surfaces, and a cavity between the left and right outer surfaces. A blade having a cutting edge has a retracted position in which the cutting edge is inside the cavity and a deployed position in which the cutting edge is outside of the cavity. A slider inside the cavity has a rear position that moves the blade to the retracted position and a front position that moves the blade to the deployed position. A tab extends from the slider, and an actuator is in sliding contact with the chassis and engaged with the tab so that the actuator and the slider move together. A front operator is inside the cavity, and the slider engages with the front operator to move the blade to the deployed position. A rear operator is inside the cavity, and the slider engages with the rear operator to move the blade to the retracted position. A spring is in threaded engagement with at least one of the front operator or the rear operator.
Those of ordinary skill in the art will better appreciate the features and aspects of such embodiments, and others, upon review of the specification.
A full and enabling disclosure of the present invention, including the best mode thereof to one skilled in the art, is set forth more particularly in the remainder of the specification, including reference to the accompanying figures, in which:
Reference will now be made in detail to present embodiments of the invention, one or more examples of which are illustrated in the accompanying drawings. The detailed description uses numerical and letter designations to refer to features in the drawings. Like or similar designations in the drawings and description have been used to refer to like or similar parts of the invention. Each example is provided by way of explanation of the invention, not limitation of the invention. In fact, it will be apparent to those skilled in the art that modifications and variations can be made in the present invention without departing from the scope or spirit thereof. For instance, features illustrated or described as part of one embodiment may be used on another embodiment to yield a still further embodiment. Thus, it is intended that the present invention covers such modifications and variations as come within the scope of the appended claims and their equivalents.
Embodiments of the present invention include a pocket knife that may be comfortably operated one-handed while accommodating manufacturing tolerances of the internal components. For convention of reference, the term “front” shall refer to the end of the pocket knife from which a blade deploys; the term “rear” shall refer to the end of the pocket knife that is opposite from the front; the term “top” shall refer to the side of the pocket knife that houses an actuator for operating the pocket knife; the term “bottom” shall refer to the side of the pocket knife that is opposite from the top; and the terms “left” and “right” shall refer to the opposing sides of the pocket knife that are adjacent to and generally perpendicular to the top and bottom.
The chassis 12 provides a frame for supporting the various components associated with the pocket knife 10 and may be molded, pressed, or machined from plastics, metals, polymers, or any material or combination of materials having the desired strength and durability. The chassis 12 may be a single piece construction or may be formed from a left chassis 18 connected to a right chassis 20 by screws 22 or other attachment means. As shown in
The blade 14 generally has one or more cutting edges 36 and can move between retracted and deployed positions. In the retracted position, as shown in
The actuator 16 controls the operation of the pocket knife 10 and has a shut or rear position, shown in
As shown most clearly in
The front and rear locks 58, 60 may be pivotally connected to the chassis 12 and biased inward in the cavity 34 by springs 64. In this manner, with the blade 14 in the retracted position, the rear lock 60 is in biased engagement with the notch 50 in the tang 44 to lock the blade 14 inside the chassis 12. Conversely, with the blade 14 in the deployed position, the front lock 58 is in biased engagement with the rear surface 48 of the tang 44 to lock the blade 14 outside of the chassis 12.
The slider 62 has a first side 66 opposed to a second side 68 and may include a front sloped surface 70 and a rear sloped surface 72 on either of the first or second sides 66, 68. In the particular embodiment shown in
A tab 74 may extend from whichever side of the slider 62 is closest to the actuator 16 so that the tab 74 engages with the actuator 16 and the actuator 16 and the slider 62 move together. In the particular embodiment shown in
The slider 62 has a rear position that moves the blade 14 to the retracted position and a front position that moves the blade 14 to the deployed position. Specifically, with the slider 62 in the front position and the blade 14 locked in the deployed position, as the slider 62 moves to the rear position, the slider 62 engages with the rear operator 56 to create tension in the spring 52. Rearward movement of the slider 62 causes the front sloped surface 70 to engage with the front lock 58 to pivot the front lock 58 outward, disengaging the front lock 58 from the rear surface 48 of the tang 44 to allow the spring 52 to pull the front operator 54 against the post 46 in the tang 44 to move the blade 14 to the retracted position. Conversely, with the slider 62 in the rear position and the blade 14 locked in the retracted position, as the slider 62 moves to the front position, the slider 62 engages with the front operator 54 to create tension in the spring 52. Forward movement of the slider 62 causes the rear sloped surface 72 to engage with the rear lock 60 to pivot the rear lock 60 outward, disengaging the rear lock 60 from the notch 50 in the tang 44 of the blade 14 to allow the spring 52 to pull the rear operator 56 against the rear surface 48 of the tang 44 to move the blade 14 to the deployed position.
Operation of the pocket knife 10 between the retracted and deployed positions will now be described with respect to
To deploy the blade 14, the actuator 16 is moved forward to the open position as shown in
When the rear lock 60 disengages from the notch 50, the tension in the spring 52 causes the rear operator 56 to eject the blade 14 out of the cavity 34 to the deployed position, as shown in
To retract the blade 14, the actuator 16 is moved rearward to the shut position as shown in
When the front lock 58 disengages from the rear surface 48 of the tang 44, the tension in the spring 52 causes the front operator 54 to pull the blade 14 into the cavity 34 to the retracted position, as shown in
The embodiments described and illustrated with respect to
This written description uses examples to disclose the invention, including the best mode, and also to enable any person skilled in the art to practice the invention, including making and using any devices or systems and performing any incorporated methods. The patentable scope of the invention is defined by the claims, and may include other examples that occur to those skilled in the art. Such other examples are intended to be within the scope of the claims if they include structural elements that do not differ from the literal language of the claims, or if they include equivalent structural elements with insubstantial differences from the literal language of the claims.
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