The disclosed technology includes a semi-automatic crossbow having a stock, a plurality of limbs, a drawstring, a bolt feeder, a barrel, a draw assembly, and a release. The draw assembly can be configured to automatically move the drawstring to a cocked position and the release can include a trigger and be configured to release the drawstring when the trigger is actuated. The disclosed technology can further include a truck configured to engage the drawstring and a bolt such that the bolt can be propelled forward by the truck when the drawstring is released by the release.

A multi-shot crossbow includes a crossbow arm, bowstrings, and a crossbow body, wherein the crossbow arm is provided with a slider which is slidably connected with the crossbow arm along a longitudinal direction of the crossbow arm, a top of the crossbow arm is fixed with an arrow chamber which is provided with a plurality of longitudinally extending arrow holes, each of the arrow holes is provided with a slidably connected hammer, each hammer is fixedly connected to the slider, the bowstrings are located below the crossbow arm, and when the slider is at a back end point, the slider is movably attached to the crossbow body. Multiple arrows can be simultaneously shot, and the hammers can be arranged side by side and can shoot all the arrows at the same time. All the arrows are evenly driven and are shot with small radius and high hit accuracy.

A continuous shooting device includes a shooting body having a driving chamber and a chain hole in connection with the driving chamber, a belt chain assembly, an arrow driving assembly and a string firing assembly. The belt chain assembly is for driving the arrow chain, to move along the chain hole, the arrow driving assembly has a push arm for pushing an arrow on the arrow chain to escape from the arrow chain, a string of the string firing assembly is for pushing the belt chain assembly, a part of the driving assembly is mounted in the driving chamber, the driving assembly includes a track rod assembly fastened in the driving chamber, and a sliding member assembly slidable along an arrangement direction of the track rod assembly. The sliding member assembly has a carrying portion for clipping a string, and a pushing portion for pushing the push shaft.

The disclosed technology includes a semi-automatic crossbow having a stock, a plurality of limbs, a drawstring, a bolt feeder, a barrel, a draw assembly, and a release. The draw assembly can be configured to automatically move the drawstring to a cocked position and the release can include a trigger and be configured to release the drawstring when the trigger is actuated. The disclosed technology can further include a truck configured to engage the drawstring and a bolt such that the bolt can be propelled forward by the truck when the drawstring is released by the release.

An arrow shooting device with an arrow chain driving structure is disclosed. The arrow shooting device includes a gun body having a gun chamber and a chain hole, an arrow chain is inserted into a side of the chain hole and exposed out of the other side of the chain hole, the chain driving assembly is disposed in the gun chamber and controlled by the driving assembly to move, the moving chain driving assembly drives the arrow chain to move between two end openings of the chain hole, the chain driving assembly includes a first slider and a second slider. The second slider has a driving block to engage the arrow chain, the driving assembly is operated to repeatedly drive the first slider and the second slider to control the driving block to push the arrow chain to move through the chain hole.

A crossbow includes a body having a grip and a connection end respectively formed to two ends of the body. A connection part is formed to the connection end and includes a clamping portion and a top portion. The top portion includes a guide face firmed to the top thereof. A bow unit includes a bow and a block which is formed to middle portion of the bow. A string is connected between two ends of the bow. The block is detachably connected to the clamping portion to transversely position the string above the guide face. A magazine includes a mounting member located corresponding to the clamping portion. The magazine is detachably connected to the body to form a room between the guide face and the magazine for movement of the string. The magazine is secured to the body by the mounting member.

A crossbow including at least one trigger assembly that may have a string catch, a sear, a trigger actuator, and an anti-dry-fire mechanism. The anti-dry-fire mechanism can include (i) a bolt sensor movable between a bolt-absent position and a bolt-present position, and (ii) a linearly reciprocating sear latch movable between a latched position and an unlatched position and biased toward the latched position. The bolt sensor may be pivotably coupled to the sear latch so that (i) with the bolt sensor in the bolt-absent position, the sear latch is held in the latched position by bias force thereon, and (ii) with the bolt sensor held in the bolt-present position, the sear latch is held in the unlatched position against the bias force thereon. When in the latched position, the sear latch can prevent movement of the sear.

The invention relates to a method for segmenting and indexing features from multidimensional data, said method comprising the steps of inputting (201) a sequence of tuples in a transformation process, first mapping (204) the tuple sequence to a sequence of hash sums with a rolling hash function, grouping (205) the sequence of tuple hash sums into a sequence of overlapping and contiguous sequences of n tuples hash sums, second mapping (206) of the resulting sequence of n tuples hash sums to a sequence of n-gram hash sums, and segmenting (207) the sequence of n-gram hash sums into chunks of tuples using a segmentation method selected in the group comprising at least one Content-Defined Chunking and Winnowing.

An arrow chain structure includes an arrow chain body and an extension member. The arrow chain body has a base part, the base part has an arrow groove and a pivoting member disposed on a side thereof, the pivoting member has an accommodation groove formed on a side thereof corresponding to the other side of the arrow groove. The extension member is disposed on the arrow chain body. The arrow chain bodies can be pivotally connected to each other by the pivoting members.

A crossbow includes a supporting body, a hook unit, a bow and a triggering device. The supporting body includes an elongated portion and a butt detachably connected to the elongated portion. The hook unit is provided on the butt. The bow is provided on the supporting body. The triggering device is located in the elongated portion to control the bow. The triggering device includes a shell, a trigger unit located in the shell, and a security unit movable between a locking position and an unlocking position. The security unit abuts against the trigger unit in the locking position to restrain the trigger unit. The hook unit moves the security unit to the unlocking position when the butt is connected to the elongated portion. The security unit moves to the locking position when the butt is moved from the elongated portion.