RECOIL REDUCER WHEN SHOOTING BULLET FROM FIREARM
The present invention provides a recoil reducer that reduces the recoil when the bullet is shot from the firearm and the bolt in the machine part is moved backward. By reducing the reaction force applied to the bolt when the bullet is shot, a load applied to the shooter is reduced. Furthermore, hit accuracy is improved by stabilizing the sight, the performance of the firearm itself is not decreased. The recoil when the bullet is shot is reduced by providing a member moving in an opposite direction of a recoil direction of a bolt and providing a transmission mechanism that moves the member in the opposite direction of the recoil direction of the bolt when the bolt is moved in the recoil direction by a reaction force of shooting a bullet.
This patent specification is based on Japanese patent application, No. 2014-132957 filed on Jun. 27, 2014 in the Japan Patent Office, the entire contents of which are incorporated by reference herein.
BACKGROUND OF THE INVENTION1. Field of the Invention:
The present invention relates to a device that weakens the impact of recoil to stabilize the sight and reduce a load applied to hands and shoulders of a shooter when a bullet is shot from a firearm (e.g., rifle) and a bolt, a barrel and the like are moved in a recoil direction.
2. Description of the Related Art:
In principle, in the machine part shown in
In the technological concept disclosed in Patent Document 1, a cylindrical buffer is provided behind the bolt and inside the cylindrical buffer is made airtight. Thus, both the recoil spring and an air brake of the cylindrical buffer reduce the recoil so as to reduce a load applied to shoulders of a shooter. In the means disclosed in Patent Document 2, with respect to the reaction force applied to the bolt, which moves backward when the bullet is shot, an opposing force is generated forward, which is opposite direction of the reaction force, to reduce the recoil. In this means, the recoil is reduced by pushing the barrel itself forward as a counterweight to generate the opposing force.
[Patent Document 1] Japanese unexamined patent application publication No. 2001-153594
[Patent Document 2] Japanese unexamined patent application publication (Translation of PCT application) No. 2003-525421
BRIEF SUMMARY OF THE INVENTIONHowever, as described above, the conventional bolt 6 basically absorbs the recoil generated when the bullet is shot by the recoil spring 2. It cannot be avoided that the recoil spring 2 receives the reaction force when the bullet is shot. Therefore, the impact when the bullet is shot is very large. For the shooter, it is a heavy burden to bear the impact and the sight is misaligned as a result. In order to reduce the above described recoil, it is also considered that a size and a material of the recoil spring built in the machine part are changed so that repulsive elastic force is weakened. However, as a disadvantage, too much time is required for the bolt 6 to return to the original position after the bullet is shot. Thus, continuous shooting is interrupted, for example. In addition, explosion property of the propellant of the bullet is limited.
On the other hand, in a technological concept disclosed in Patent Document 1, as a method of reducing the reaction force when shooting the bullet, the recoil spring 2 in contacted with a rear end of the bolt 6 and an air brake of the cylindrical buffer are simultaneously used for reducing strong impact. This is effective in terms of reducing the reaction force doubly. In this point, there is an effect of slowly transferring the recoil energy, which is directed backward (direction of the shooter). However, the movement of the return becomes slow and therefore bad influence may occur when loading the next bullet, for example. In a technological concept disclosed in Patent Document 2, as a means of directing the reaction force, which is originally directed in the recoil direction, also forward, the barrel itself is allowed to move forward to counterbalance the reaction force. However, since the barrel itself is moved forward as a counterweight, shooting force itself is decreased and therefore bad influence may occur in the performance of the gun. Namely, initial speed of the bullet may decrease.
The present invention provides a recoil reducer that reduces the recoil when the bullet is shot from the firearm and the bolt in the machine part is moved backward. By reducing the reaction force applied to the bolt when the bullet is shot, a load applied to the shooter is reduced. Furthermore, hit accuracy is improved by stabilizing the sight, the performance such as the initial speed of the firearm itself is not decreased, and the operation such as the loading of the next bullet is not obstructed.
In claim 1 of the present invention, a recoil reducer includes: a bolt that is installed on a first slit groove of a casing of a machine part and is slidably movable with respect to the casing; a forward moving member that is installed on a second slit groove of the casing of the machine part and is slidably movable with respect to the casing in an opposite direction of a recoil direction of the bolt; a transmission mechanism that moves the forward moving member in the opposite direction of the recoil direction of the bolt when the bolt is moved in the recoil direction by a reaction force of shooting a bullet; a first elastic body that is located between an end portion of the bolt in the recoil direction and the machine part; and a second elastic body that is located between an end portion of the forward moving member in a forward direction and the machine part.
In the invention of the recoil reducer of any one of claims 1 to 5, in order to reduce the reaction force, a recoil spring is located in contact with the end portion of the bolt in the recoil direction and a movable elastic body is located at the end portion of the forward moving member. Specifically, in the transmission mechanism, a rotating body is used for engaging the forward moving member with the bolt. More specially, a combination of a rack and pinion gear and a gear, a combination of a chain and a sprocket, or a combination of a belt and a pulley can be used.
In the above, the elastic body is not limited to the spring. For example, the elastic body can be a plate spring, a rubber, and a resin having a predetermined elasticity, for example.
By using the present invention, the reaction force applied to the bolt when shooting the bullet is also directed to the forward direction (shooting direction of the bullet) by the transmission mechanism. Thus, the reaction force applied to the bolt when shooting the bullet is reduced by the repulsion force of the elastic body (e.g. return spring, rubber and resin) which is in contact with the forward moving member and sliding resistance of the rotating body. Consequently, by using the recoil reducer of the present invention, the load applied to the shooter is reduced, the barrel is prevented from moving upwardly, and no problem occurs when the bolt is returned to the original position in the machine part after shooting the bullet.
Hereafter, the present invention will be explained based on the drawings.
On the other hand, the bolt 6 also has a substantially semicylindrical shape. A rack and pinion gear 61 is formed on an upper surface of the bolt 6. The bolt 6 is installed on a slit groove (first slit groove) of the casing of the machine part by a protruding slit 62 so that the bolt 6 is slidably movable. The bolt 6 is in contact with the recoil spring 2 (first elastic body) which is fixed to the machine part at a rear end (left end in
As explained above, the present embodiment includes: the bolt 6 that is installed on a first slit groove of a casing of a machine part and is slidably movable with respect to the casing; the forward moving member 3 that is installed on a second slit groove of the casing of the machine part and is slidably movable with respect to the casing in an opposite direction of a recoil direction of the bolt; the transmission mechanism that moves the forward moving member in the opposite direction of the recoil direction of the bolt when the bolt is moved in the recoil direction by a reaction force of shooting a bullet; the first elastic body 2 that is located between an end portion of the bolt in the recoil direction and the machine part; and the second elastic body 4 that is located between an end portion of the forward moving member in a forward direction and the machine part.
In the above described embodiment, the bolt 6 and the forward moving member 3 are installed on the slit grooves of the casing of the machine part and slidably movable with respect to the casing. However, other engagement mechanisms can be used to hold the bolt 6 and the forward moving member 3 slidably movable with respect to the casing.
In addition, the rack and pinion gear 31 and the gear 5 are used as the transmission mechanism. The rack and pinion gear 31 and the gear 5 correspond to a rotating body engaged between the bolt 6 and the forward moving member 3.
Furthermore, in the above described embodiment, the bolt 6 and the forward moving member 3 have a substantially semicylindrical shape. The bolt 6 and the forward moving member 3 are arranged vertically so that flat surfaces of the bolt 6 and the forward moving member 3 face each other.
The operation of the recoil reducer will be explained by using
In the above explained process, the bolt 6 is moved in the recoil direction (leftward in
In the above described embodiment, a rotating body, which is slid between the bolt 6 and the forward moving member 3, is used as the transmission mechanism.
In the example of
As shown in
In the above described embodiment, a combination of a belt and a gear is used as the transmission mechanism.
Different from the embodiments shown in
In the embodiments shown in
In an operation of manually loading the first bullet, the repulsion force is generated in the return spring located at the side of the forward moving member when the bolt is pulled backward. Also in the dual-purpose spring, if the repulsion force is designed to be strong, difficulties occur in operation. Therefore, the spring having an appropriate repulsion force should be used considering the area of installing the spring. Furthermore, since the reaction force varies depending on a weight of the bullet and an amount of the gunpowder, an appropriate spring force should be adjusted also in such a point of view.
For example, considering a structure and a size of the firearm, it can be decided that a plurality of springs is used or a single dual-purpose spring is used.
An embodiment shown by cross-sectional view in
The present invention is industrially applicable because it can be valuably used for hunting or sport shooting.
Note that, this invention is not limited to the above-mentioned embodiments. Although it is to those skilled in the art, the following are disclosed as the one embodiment of this invention.
-
- Mutually substitutable members, configurations, etc. disclosed in the embodiment can be used with their combination altered appropriately.
- Although not disclosed in the embodiment, members, configurations, etc. that belong to the known technology and can be substituted with the members, the configurations, etc. disclosed in the embodiment can be appropriately substituted or are used by altering their combination.
- Although not disclosed in the embodiment, members, configurations, etc. that those skilled in the art can consider as substitutions of the members, the configurations, etc. disclosed in the embodiment are substituted with the above mentioned appropriately or are used by altering its combination.
Claims
1. A recoil reducer, comprising:
- a bolt that is installed on a first slit groove of a casing of a machine part and is slidably movable with respect to the casing;
- a forward moving member that is installed on a second slit groove of the casing of the machine part and is slidably movable with respect to the casing in an opposite direction of a recoil direction of the bolt;
- a transmission mechanism that moves the forward moving member in the opposite direction of the recoil direction of the bolt when the bolt is moved in the recoil direction by a reaction force of shooting a bullet;
- a first elastic body that is located between an end portion of the bolt in the recoil direction and the machine part; and
- a second elastic body that is located between an end portion of the forward moving member in a forward direction and the machine part.
2. The recoil reducer according to claim 1, wherein
- a rotating body, which is slid or engaged between the bolt and the forward moving member, is used as the transmission mechanism.
3. The recoil reducer according to claim 2, wherein
- a rack and pinion gear and a gear are used in a part of the rotating body as the transmission mechanism.
4. The recoil reducer according to claim 1, wherein
- a combination of a chain and a sprocket, or a combination of a belt and a pulley is used as the transmission mechanism.
Type: Application
Filed: Jun 23, 2015
Publication Date: Dec 31, 2015
Inventor: Akihisa FURUSHO (Tajimi-shi)
Application Number: 14/746,840