TWI530666B - The cross string is higher than the main string - Google Patents

Description

a crossbow with a secondary string higher than the main string

The present invention relates to a crossbow, and more particularly to a person whose substring is higher than the main string.

The compound bow was first invented by the American Holless Wilbur Allen in 1969, see U.S. Patent No. 3,486,495. In short, the compound bow uses a special eccentric wheel or lever system to increase the storage capacity when pulling the bow, and the holding force required to pull the full bow is smaller than the traditional bow, and it can be more stable. Aim and improve the accuracy of shooting. Similarly, the general crossbow is also applied to a similar lever system to achieve similar functions.

The fourth figure shows a conventional crossbow 900 which generally includes a butt body 91, a bow 92 disposed at the front end of the butt body 91, and two bow arms 93, 94 coupled to the ends of the bow 92. And two eccentric wheel sets 95, 96 and a bow string set 97 disposed at the rear ends of the two bow arms 93, 94. Above the stock body 91 is defined a slide 911 for an arrow body (not shown) and a trigger 912 underneath for launching the arrow. Each eccentric wheel set 95 (or 96) is comprised of a main chord wheel 951 (or 961) and a smaller sub-chord wheel (not shown) that abuts the main chord wheel. The string assembly 97 includes a main string 970 and two Y-shaped substrings 971, 972.

It should be noted that the main string 970 is spanned on the two pulley blocks. The main chords 951, 961 of the two pulley blocks 95, 96 are respectively disposed between 95 and 96 and at both ends thereof. One end of each string 971 (or 972) is wound around a secondary chord of one of the pulley sets 95 (or 96), and the other end is branched and fixed to the other pulley block 96 (or 95) opposite thereto. On the end of the axle. In other words, the middle section of the two pairs of strings 971, 972 is lower than the main string 970 and meets in the vicinity of the slide 911 of the stock body 91. In this regard, the front end of the gun body 91 defines a section 910 for the two strings 971, 972 to pass through to prevent the two strings 971, 972 from affecting the emission of the bow; however, the formation of the groove 910 The strength of the front end of the stock body 91 may be damaged, resulting in a decrease in the degree of collimation of the slide 911 above the stock body 91, which may adversely affect the shooting; further, the formation of the cutting groove 910 is necessary to increase the gun. The thickness of the front end of the main body 91 is advantageous for the steps of cutting and the like, and the manufacturing cost is not increased, and the structure cannot be reduced in weight.

In view of the above, it is a primary object of the present invention to provide an improved crossbow that does not require machining of the butt body to form the above-described groove, thereby reducing the thickness of the front end of the butt body, thereby achieving weight reduction and ease of manufacture.

To achieve the above object, the crossbow of the present invention generally comprises a butt body, a bow head, two bow arms, two pulley blocks and a bowstring set. Wherein, the stock body is defined above with a slideway for an arrow body, and a trigger is arranged below it for launching the arrow body. The bow head is disposed at a front end of the butt body. The two bow arms are respectively coupled to both ends of the bow. The two pulley blocks are respectively disposed at the rear ends of the two arch arms, and each of the pulley blocks includes a main chord wheel and a pair of chord wheels abutting the main chord wheel. The bowstring set includes a main string, a first substring, and a second substring. The two ends of the main string are respectively wound around the main chord of the two pulley blocks, and are higher than The slide of the butt body. One end of the first sub-chord is wound around a sub-chord of one of the pulley sets, and the other end is fixed to the axle of the other pulley block. Similarly, one end of the second substring is wound around the sub-string of the other pulley block, and the other end is fixed to the pulley block. Thus, the middle sections of the first and second sub-chords are located above the main string.

A further technical feature of the present invention is that at least one of the two pulley blocks is an eccentric wheel set. Further, the crossbone of the present invention further includes at least one plucking rod extending between the first substring and the main string to move the middle section of the first substring upward to no Block the height of the arrow's launch. Wherein, one end of the plucking rod is connected to the bow head, and the other end extends rearward to between the first substring and the main string. Therefore, the present invention does not require additional processing of the butt body of the butt body to form a groove through which the substring passes, and thus is easier to manufacture and lightweight.

Other objects, features, and details of the present invention will be apparent from the description and appended claims.

this invention:

100‧‧‧cross bow

1‧‧‧Feedo body

10‧‧‧Slide

11‧‧‧Army

12‧‧‧ Trigger

2‧‧‧ bow head

21, 22 ‧ ‧ plucking chord

3, 4‧‧‧ bow arm

5, 6‧‧‧ pulley block

51, 61‧‧‧ main chord wheel

52, 62‧‧‧Substring wheel

7‧‧‧ bowstring group

70‧‧‧ main string

71‧‧‧First substring

72‧‧‧second secondary string

8‧‧‧foot ring

Convention:

900‧‧‧cross bow

91‧‧‧Feedo body

910‧‧‧"

911‧‧‧ slide

912‧‧‧ trigger

92‧‧‧ bow head

93, 94‧‧‧ bow arm

95, 96‧‧‧ eccentric wheel set

951, 961‧‧‧ main chord

97‧‧‧ bowstring group

970‧‧‧ main string

971, 972‧‧‧Substring

The first figure is a schematic perspective view of a crossbow of the present invention.

The second figure is a partially enlarged schematic view of the crossbow of the present invention.

The third figure is a side view of the crossbow of the present invention.

The fourth figure is a three-dimensional diagram of a conventional crossbow.

Referring to Figures 1 and 2, there is shown a schematic view of one preferred embodiment of the crossbow 100 of the present invention. As shown in the figure, the crossbow includes a butt body 1, a bow 2 disposed at the front end of the butt body 1, and two arch arms 3, 4 respectively coupled to the ends of the bow 2, respectively Two pulley blocks 5, 6, and the rear end of the two bow arms 3, 4 A bowstring set 7 disposed between the two pulley blocks 5, 6 and a pedal ring 8 disposed at the front end of the stock holder body 1.

As shown in the first figure, the gun body 1 has a trigger 12 below it, and a slide 10 is defined above it for the arrow body 11 (third figure). Once the archer pulls the trigger 12, the string assembly 7 is released so that the arrow 11 on the slide 10 is launched along the slide 10.

In detail, as shown in the enlarged view of the second figure, each pulley block 5 includes a main chord 51 and a smaller sub-chord 52 that abuts the main chord 51. As further shown in the first figure, the string assembly 7 includes a main string 70, a first substring 71 and a second substring 72. The two ends of the main string 70 are respectively wound around the main chocks 51 and 61 of the two pulley blocks 5 and 6, and are higher than the slide 10 of the stock body 1. One end of the first sub-chord 71 is wound around the sub-chord wheel 52 of one of the pulley blocks 5, and the other end is branched and fixed to the two ends of the axle (not shown) of the other pulley block 6, and respectively abutted On opposite sides of the rear end of the bow arm 4. Similarly, one end of the second sub-chord 72 is wound around the sub-chord 62 of the other pulley block 6, and the other end is branched and fixed to the two ends of the axle (not shown) of the pulley block 5, respectively. It abuts against two opposite sides of the rear end of the bow arm 3. Therefore, it is worth noting that the middle sections of the first and second sub-chords 71, 72 are located above the main string 70, as shown in the third figure.

Preferably, the crossbow 100 of the present invention further includes a pair of parallel plucking chords 21, 22 to further shift the middle section of the first and second sub-chords 71, 72 further than the hoisting body 1 The arrow 11 on the slide 10 is as shown in the third figure. Wherein, one end of each plucking rod 21 or 22 is fixed to the bow head 2, and the other end extends rearward to the first and second sub-chord lines 71, 72 and the main string 70 Interposed, as shown in the first or third figure, to shift the middle portion of the first and second sub-chords 71, 72 upward to a position higher than the arrow 11, without hindering the launch of the arrow 11 . In addition, in the preferred embodiment, the plucking levers 21, 22 are fixed to the bow head, but are not limited thereto, and may be fixed to the stock body 1, as long as the two strings 71 can be disengaged. 72 so that it does not obstruct the launch of the arrow 11.

It is also worth noting that the two pulley blocks 5, 6 of the preferred embodiment of the present invention are both eccentric wheels, that is, a double eccentric wheel set. However, in other examples, it is also possible to use a single eccentric wheel set, that is, a combination of an idler wheel and an eccentric wheel.

As described above, the crossbow of the present invention does not need to be additionally processed at the front end of the stock body 1 as in the prior art to form a groove for allowing the substring to pass, so that the thickness of the front end of the stock body 1 can be relatively thin. It also does not affect the degree of collimation of the slide, and the manufacturing is relatively simple, and the purpose of weight reduction can be achieved.

The above is only a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any equivalent modifications or alterations that do not depart from the spirit of the invention are intended to be included within the scope of the invention.

100‧‧‧cross bow

1‧‧‧Feedo body

10‧‧‧Slide

12‧‧‧ Trigger

2‧‧‧ bow head

21, 22 ‧ ‧ plucking chord

3, 4‧‧‧ bow arm

5, 6‧‧‧ pulley block

51, 61‧‧‧ main chord wheel

52, 62‧‧‧Substring wheel

7‧‧‧ bowstring group

70‧‧‧ main string

71‧‧‧First substring

72‧‧‧second secondary string

8‧‧‧foot ring

Claims (4)

A crossbow includes: a butt body having a slideway defined above for an arrow body and having a trigger underneath for launching the arrow; a bow head disposed at the front end of the butt body; The bow arms are respectively coupled to the two ends of the bow head; the two pulley blocks are respectively disposed at the rear ends of the two bow arms, and each of the pulley sets includes a main chordal wheel and a pair of chordal wheels abutting the main chordal wheel And a string group comprising a main string, a first substring and a second substring; the two ends of the main string are respectively wound around the main chine of the two pulley sets, and higher than the gun a slide of the main body; one end of the first substring is wound around the sub-string of one of the pulley sets, and the other end is fixed to the axle of the other pulley; and one end of the second substring is wound around the other a secondary chord of a pulley block, the other end being fixed to the axle of the pulley block; and the middle section of the first and second subchords are located above the main chord. The crossbow of claim 1, wherein at least one of the two sets of pulleys is an eccentric wheel set. The crossbow according to claim 1, further comprising at least one plucking rod extending between the first substring and the main string to move the middle portion of the first substring Move up to the height that does not hinder the launch of the arrow. The crossbow of claim 3, wherein one end of the plucking lever is coupled to the bow and the other end extends rearwardly between the first substring and the main string.