475 results about "Bowstring" patented technology

Crossbow bowstring drawing mechanisms which are integrated into or secured in the crossbow handle and which provide a straight and balanced draw to the crossbow bowstring to cock the crossbow bowstring in position in the crossbow trigger mechanism ready for firing. The cocking system can be manually operated or motorized, and can be manufactured as part of a crossbow or retrofit into a crossbow. An internal or external source of rotational power, such as hand crank, power screwdriver or an electrical motor, is preferably utilized in conjunction with a claw member including a bowstring engaging portion to translate rotation of the input source to longitudinal movement of the claw member to draw or release the crossbow bowstring resulting with minimal effort being expended by the user. The claw member may include adjustable cams used to center the claw member with respect to the crossbow barrel.

A bowstring drawing device for a crossbow has a mounting base, a reeling device and a hook. The mounting base has a rail. The reeling device has a casing with a bottom face and a rail recess defined in the bottom face of the casing to slidably engage with the rail of the mounting base. A wheel assembly is accommodated inside the casing and a crank arm connected to drive the wheel assembly. A clutch is operationally connected to the wheel assembly. The hook is retractably connected to the reeling device by a string. Because the reeling device and the mounting base are engaged with the rail and rail recess, detachment or engagement of the reeling device is convenient. Moreover, the crank arm and the wheel assembly also make the operation of the bowstring drawing device effort-saving.

A crossbow having an improved firing assembly. The improved assembly attaches to a bowstring at a single point and draws the string back to have the string retained between a first string retainer and a second string retainer. By allowing the string to be drawn utilizing a single contact point on the bowstring as opposed to the prior art methods of dual engagement points with the bowstring, the cost, maintenance and undesired variance in string retention associated with the prior art are substantially eliminated.

A device to provide assistance in drawing back the bowstring of a crossbow. In particular, a device that assists an operator which drawing back the bowstring of a crossbow to allow the crossbow to be loaded with a projectile and fired in an appropriate manner.

A compound bow or crossbow employs bowstring cams with bowstring cam grooves and power cord cam grooves. Preferably a pair of generally identical power cord cam grooves are positioned axially above and below the bowstring cam groove. The power cords are anchored to a fixed anchor point, e.g., a pylon, on the near end of the riser or on the near side of the crossbow bar or stock. The power cords do not cross over to the other limb. The reduction in the number of cam wheels and pulleys and in the number of strings or cords results in greater efficiency and higher transfer of energy from the bow to the arrow or bolt. There is no drop-off in pull weight at full draw. The bolt or arrow accelerates throughout the travel of the bowstring, resulting in significantly higher velocity.

A crossbow having a bowstring cocking winch apparatus, a cocking winch apparatus usable with a crossbow, and a method of operating the apparatus are described. The cocking winch apparatus includes a projecting alignment member having a non-round cross-sectional shape, where the alignment member is removably securable to a butt portion of a crossbow stock by inserting the alignment member into a correspondingly-shaped hole formed in the stock. The cocking winch apparatus provides a straight and balanced draw to the crossbow bowstring, enabling a user to easily cock the bowstring by rotating a handle to draw the bowstring back, and to place it in cocked position in the crossbow trigger mechanism.

A crossbow having an increased powerstroke and reduced noise. The powerstroke is increased by inverting the limb orientation from the standard crossbow arrangement and locating string guides at least partially forward and rearward of the ends of the limbs. The bowstring is drawn from the tops of the string guides to maximize the powerstroke, reducing noise and increasing the retained and delivered energy over existing crossbows.

An inverted compound archery bow including an extended-capacity cam system having two cams, each cam engaging the bowstring and separate cables extending to limbs of the bow. The bowstring and cables are counter-wound on the cams, producing tension opposite and proportional to the inverse ratio of windings. Drawing the bowstring winds the cables onto the cams, producing limb tension that propels an arrow when the bowstring is released. An arrow rest located between full-draw and rest excursions of the bowstring accommodates the extended draw length of the bow. A bowstring arrestor engages the bowstring at an intermediate-draw position. A slide stabilizes and supports a rear portion of the bow, and a receptacle on the slide engages an adapter for a bowstring release mechanism.

A crossbow accessory for coupling to a modular lower receiver of a rifle includes an elongated frame coupled to a riser at a first end, and coupled above the lower receiver at its second end. An upper housing secured to the second end of the frame includes a rope spool and winding gears for retracting the bowstring toward a drawn position. A rope extends from the rope spool to a bowstring release for retracting the bowstring. The bowstring release is retracted into the upper housing proximate the modular lower receiver for selectively releasing the bowstring when a user pulls the trigger of the lower receiver. A method for creating a crossbow using the modular lower receiver is also disclosed.

A crossbow has a riser, flexible limbs, a bowstring extending between the tips of the limbs for propelling an arrow, and an elongated frame extending from the riser. A bowstring release proximate the rear end of the elongated frame includes a trigger for releasing the bowstring, and firing an arrow. A first grip is disposed proximate to the trigger for being grasped by the user's first hand. A “Picatinny” type support rail extends along and below the elongated frame, secured at its rearmost end to the elongated frame, but otherwise spaced therefrom. The support rail can receive fore-grips, a bi-pod, or can be rested against a support surface to help steady the crossbow during firing.

A crossbow having an increased powerstroke and reduced noise. The powerstroke is increased by inverting the limb orientation from the standard crossbow arrangement and locating string guides at least partially forward and rearward of the ends of the limbs. The bowstring is drawn from the tops of the string guides to maximize the powerstroke, reducing noise and increasing the retained and delivered energy over existing crossbows.

A trigger assembly has a housing, a trigger, a string holder, a bowstring catch biasing member, a safety pin, a safety lock, a pushing arm, a block, a block biasing member and a string stop. The housing has a mouth. The trigger has a trigger element and an actuating lever combined with the trigger element by dovetailed recess and protrusion. The bowstring catch has a string hook and a leg selectively engaging the hook on the actuating lever. The safety pin is moveably mounted in the housing and is supported on the actuating lever. The safety lock is moveably mounted in the housing and has a push rod. The pushing arm has a protrusion abutting the push rod. The block has a transverse rod selectively engaging the front end of the pushing arm. Accordingly, a trigger assembly with two safety features is provided.

A crossbow may include a main beam; a compound bow assembly mounted to the main beam including a riser and a pair of bow limbs; and a trigger mechanism mounted to the main beam for use in holding a bowstring in a cocked position. The crossbow may include wheels at opposite ends of the bow that operatively receive the bowstring. The wheels may be separated by a wheel distance (WD) when the crossbow is in an un-cocked position. The crossbow may also have a power stroke distance (PD) and the ratio WD / PD may be less than 2.0. The crossbow may include a foot stirrup being integral with the riser, the foot stirrup beginning behind the pair of bow limbs and extending beyond the bow limbs.

A crossbow includes an elongated frame coupled to a riser at a first end thereof. The riser supports a pair of flexible limbs, and a bowstring extends between such limbs. A movable bowstring release is used both to retract the bowstring into a drawn position, and to release the bowstring under the operation of a trigger assembly. The bowstring release is initially positioned near the bowstring at rest, and a bowstring hook is engaged therewith. A bowstring retractor includes a retractor rope secured to the bowstring release for retracting the bowstring. An upper housing is secured to the second end of the elongated frame, and supports a rope spool used to wind the retractor rope. The bowstring release is retracted into the upper housing proximate a trigger assembly for selectively releasing the bowstring when a user pulls a trigger.

Compound bow in which a cable interfering with advance of an arrow is removed to improve shooting accuracy of the arrow, to prevent the distortion of the bow, and to simply manipulate equipment of the bow. The compound bow comprises: handle having fixing portions protruding from one surface thereof; wing units coupled to both ends of the handle; rotating units rotatably coupled to free ends of the wing units, respectively, by an eccentric shaft; a bow string connected between the respective rotating units; a pulley shaft-coupled to the fixing portion of the handle; cable members each having one end connected to each rotating unit and the other end connected to the free end of each wing unit via the pulley. Optionally tensioner member may be installed on one side of each cable member and ratchet member may be installed on the respective rotating units and wing units.

Symmetrical and asymmetrical snares are used for endoscopically controlled methods by which tumors in hollow organs of the gastrointestinal tract can be ensnared and RF-surgically removed from the organ wall for diagnostic and / or therapeutic purposes. These snares are characterised in that one of the two snare portions, in the case of asymmetrical snares the longer of the two snare portions, is completely electrically insulated or is made from electrically non-conductive material and that the other of the two snare portions is made from electrically conductive material and its surface is not electrically insulated. In one embodiment, the asymmetrical snare is characterised in that the long snare portion is so much flexurally stiffer than the short snare portion that it tensions the short snare portion like the string of a bow.

An archery bow includes a main riser frame with limbs extending therefrom. Each of the limbs has forward ends extended from the main riser frame. A bowstring has wound ends that are wound onto each of wheel cams that are attached to the limbs. The bowstring has a middle section that is not wound onto the wheel cams and that begins and ends at points on the wheel cams that are proximate to the farthest points along the wheel cams from the main riser frame. An elongate tube is mounted to the main riser frame through the central bore, and has a front handle attached to the elongate tube outer surface, and positioned between the first and second pairs of limbs. A push rod is slidably mounted at least partially inside the elongate tube, and has a rearward handle disposed outside the elongate tube rearward end.

A digital camera is adapted for being mounted to a bow for archery. The camera comprises a self-contained digital unit within a housing and is protected from vibrational disturbances caused by the release of the bowstring. A viscoelastic material is used to reduce vibrations. The housing is water resistant to protect the internal circuitry of the camera from environmental elements encountered during hunting. A secure digital slot is connected to the digital camera circuitry and can accept a SD flash memory card. The camera may also be connected for transmitting images to an external device for viewing.

A crossbow with an improved cocking assembly. The improvement includes a means for automatically disengaging a hook associated with a cocking assembly from a bowstring once the bowstring has been drawn the desired distance behind a bowstring retainer. The automatic disengagement of the hook from the bowstring reduces movement and sound associated with disengagement, and reduces the likelihood of injury associated with placement of the fingers in front of the cocked bowstring. The disengagement mechanism may either be mechanical or magnetic as desired.

A crossbow is provided which, in a first preferred embodiment, has a frame having a rear end, and a firing assembly and a butt member, each of which are associated with the frame. The firing assembly also has a finger-pull mechanism. The butt member has a rear end which is configured to abut a front of a shoulder of a user, and the butt member is positioned between the finger-pull mechanism and the rear end of the frame. In a second preferred embodiment, the crossbow has a frame having a rear end and first and second limbs secured to the frame. A bowstring extends between the first and second limbs and is configured to move between a forward rest position and a rearward cocked position. The rear end of the frame is configured to be positioned rearward of a front of a shoulder of a user.

A compound spring-loaded archery bow, which retains the appearance of a traditional bow, has a rigid bow frame that is formed by a central riser with a handgrip and arrow rest, an upper limb extending upward from the central riser and a lower limb extending downward from the central riser. Cam mechanisms are mounted at the upper end of the upper limb and the lower end of the lower limb and a bowstring is secured to and extends between the upper and lower cam mechanisms. When the bowstring is drawn from an initial preset position to shoot an arrow, there is a synchronized actuation of the upper and lower cam mechanisms. The upper and lower limbs are tubular and contain separate upper and lower spring assemblies for applying tension to the bowstring through the cam mechanisms only when the bowstring is drawn from its initial preset position. The degree of initial compression of the springs in the upper and lower spring assemblies can be independently adjusted to adjust the magnitude of the forces exerted on the bowstring by the assemblies when the bowstring is drawn to thereby set the maximum drawing force for the bowstring and the relative forces exerted on the bowstring by the assemblies.