Patent Application
20250060187
The present invention relates to a bow and, more particularly, to a bow string release for use with a bow.
A user of manually pulls and loads a string of a bow. Then, the user releases the string to shoot an arrow. How the user releases the string influences the precision in the shooting of the arrow. The user might hurt his or her fingers and exhaust his or her arms.
Currently, composite bows are popular. A composite bow allows the string to loaded with considerable tension that however exerts a heavy load on a user's arms and fingers. Therefore, there is a need for a device to help a user pull and release a string of a composite bow.
Conventional bow string releases can be found in U.S. Pat. Nos. 5,765,536, 5596977, 5020508 and 5448983. However, while using such a conventional bow string release to pull a string, a user has to pay attention to a trigger to avoid accidental release of the string.
To solve the foregoing problem, U.S. Pat. No. 6,763,819 discloses a bow string release that includes two jaws 20, a spring 30 for opening the jaws 20, a roller 50 in contact with the jaws 20, a trigger 40 connected to the roller 50 via a link 60, and a spring 85 for pushing the trigger 40 to push the link 60 to push the roller 50 to push and hence close the jaws 20.
There are problems with the use of the bow string release disclosed in U.S. Pat. No. 6,763,819. Firstly, once portions 53 of the jaws 20 are worn out, the rear ends of the jaws 20 become incline faces that could push the roller 50 rearward, thereby allowing the front ends of the jaws 20 to open to release the bow string accidentally.
Secondly, the rear end of the upper (or lower) jaw 20 does not move relative to the roller 50 but the rear end of the lower (or upper) jaw 20 moves relative to the roller 50. Hence, one of the jaws 20 and the roller 50 wear away each other.
Thirdly, the rear end of the upper (or lower) jaw 20 does not move relative to the roller 50 but the rear end of the lower (or upper) jaw 20 moves relative to the roller 50. Hence, one of the jaws 20 is not pivoted smoothly.
The present invention is therefore intended to obviate or at least alleviate the problems encountered in the prior art.
It is an objective of the present invention to provide a reliable bow string release.
To achieve the foregoing objective, the bow string release includes a clip unit and a trigger. The clip unit includes a fork, two jaws, two springs and a roller. Each of the jaws includes an intermediate section pivotally connected to the fork. The first spring is compressed between the first and second jaws to open front ends of the first and second hooks. The roller is connected to a rear end of the first jaw. The second spring is pivotally connected to the fork. The trigger includes a first end extending from the fork, a second end pivotally connected to a rear end of the second jaw, and an intermediate section biased by the second spring. Thus, the intermediate section of the trigger pushes the roller and the lower end of the trigger moves the rear end of the second jaw, thereby moving the front ends of the first and second jaws toward each other.
Other objectives, advantages and features of the present invention will be apparent from the following description referring to the attached drawings.
The present invention will be described via detailed illustration of the preferred embodiment referring to the drawings wherein:
Referring to
The wrist unit 10 is operable to hold onto a user's wrist (not shown). The wrist unit 10 includes a belt 11 connected to a pulling rod 12. The belt 11 preferably includes holes punched adjacent to an end and a buckle connected to another end. The belt 11 is conventional and hence will not be further described in detail.
The connector unit 20 includes a cylinder 21 connected to the pulling rod 12 and via a threaded bolt 22.
The cylinder 21 includes a front axial bore 211, a rear axial bore 212 and two lateral bores 213.
The front axial bore 211 is made in a front end pointed at the cylinder 21.
The rear axial bore 212 is made in a rear end pointed at the pulling rod 12. The rear axial bore 212 is in communication with the front axial bore 211. The rear axial bore 212 is made with a diameter smaller than that of the front axial bore 211, thereby forming a shoulder between them.
The lateral bores 213 are made in a line in perpendicular to an axis (not numbered) of the cylinder 21.
The threaded bolt 22 is formed with a head 221. The threaded bolt 22 is inserted in a screw hole (not numbered) in the pulling rod 12 after it is extended through the rear axial bore 212. The head 221 is operable to abut against the shoulder between the axial bores 211 and 212, thereby keeping the cylinder 21 on the threaded bolt 22 while allowing rotation of the cylinder 21 relative to the threaded bolt 22.
The clip unit 30 includes a fork 31 connected to the cylinder 21, two jaws 32 and 33, two springs 34 and 36, and a roller 35.
The fork 31 includes two branches (not numbered) extending from a socket (not numbered). The socket includes a chamber 311 and screw holes (not numbered) evenly distributed along an axial direction thereof. The screw holes are in communication with the chamber 311. A screw (not numbered) is inserted in a selected one of the screw holes made in the socket of the fork 31 and the transverse holes 213 of the cylinder 21, thereby connecting the cylinder 21 to the socket of the fork 31 while allowing the entire length of the bow string release to be adjusted. In addition, the fork 31 and the cylinder 21 are rotatable relative to the threaded bolt 22 and the pulling rod 12.
The branches are separated from each other by a gap 312.
The jaw 32 is located in the gap 312 and pivotally connected to the branches of the fork 31 by a pin Al. The jaw 32 includes a hook 321, a recess 322, a bore 323 and a hemi-sphere 324.
The hook 321 extends from a front end of the jaw 32.
The recess 322 is made in a rear end of the jaw 32, thereby making the rear end of the jaw 32 a bifurcated one.
The bore 323 is made in a lower face of the jaw 32 adjacent to the front end of the jaw 32.
The hemi-sphere 324 is made in the lower face of the jaw 32 between the recess 322 and the bore 323.
The jaw 33 is located in the gap 312 and pivotally connected to the fork 31 by a pin A2. The jaw 33 includes a second hook 331, a recess 332, a bore 333 and a hemi-spherical cavity 334.
The hook 331 extends from a front end of the hook 321 corresponding to the jaw 321 of the hook 321.
The recess 332 is made in a rear end of the jaw 33, thereby making the rear end of the jaw 33 a bifurcated one.
The bore 333 is made in a lower face of the jaw 33 adjacent to the front end of the jaw 33 corresponding to the bore 323 in the jaw 32.
The hemi-spherical cavity 334 is made in an upper face of the jaw 33 between the bore 333 and the recess 332. The hemi-spherical cavity 334 is operable to receive the hemi-sphere 324.
The spring 34 is a helical spring compressed between the jaws 32 and 33. The spring 34 includes an end located in the bore 323 and another end located in the bore 333, thereby keeping the spring between the jaws 32 and 33.
The roller 35 is located in the recess 322 and rotationally connected to the rear end of the first jaw 32 by a pin A3.
The trigger unit 40 includes a trigger 41 and an adjustment element 42. Preferably, the adjustment element 42 is a threaded rod.
The trigger 41 includes an upper section extending from the fork 31 and a lower section located in the recess 332 and pivotally connected to the rear end of the jaw 33 by a pin A5. The trigger 41 includes a cutout 411 and a screw hole 412.
The cutout 411 is made in a front face of the trigger 41. The cutout 411 is operable to receive the roller 35.
The screw hole 412 is in communication with the cutout 411.
Referring to
The spring 36 is a torque spring including a helical portion formed between two rectilinear portions. The helical portion of the spring 36 is located in the recess 332 and pivotally connected to the socket of the fork 31 by a pin A4. One of the rectilinear portions of the spring 36 is in contact with the trigger 41 and the remaining one of the rectilinear portions of the spring 36 is in contact with the socket of the fork 31.
Thus, trigger 41 is pivoted forward about the pin A4 by the spring 36. The roller 35 is moved forward by the trigger 41. The forward movement of the roller 35 by the trigger 41 is smooth because the roller 35 is allowed to rotate about the pin A3. Accordingly, the jaw 32 is smoothly pivotable about the pin A1.
The skid-proof element 50 includes a lug (not numbered) located in the gap 312 and connected to the branches of the fork 31 by the pin A4.
Referring to
Referring to
The roller 35 is firmly kept in the cutout 411, thereby firmly keeping the jaws 32 and 33 closed. Hence, the bow string is firmly clipped by the jaws 32 and 33. Now, a user is allowed to use the bow string release to pull and hence load the bow string without having to pay attention to the jaws 32 and 33. Moreover, the user can hold the skid-proof element 50 to have a firm grip on the fork 31.
The trigger 41 is pulled, i.e., moved to the position shown in
Referring to
The present invention has been described via the illustration of the preferred embodiment. Those skilled in the art can derive variations from the preferred embodiment without departing from the scope of the present invention. Therefore, the preferred embodiment shall not limit the scope of the present invention defined in the claims.
