JP5588037B2 - Plunger for archery - Google Patents

Description

  The present invention relates to an archery plunger.

It is ideal if the bow / arrow hitting probability can be increased by the shape and configuration of the plunger of the bow used for archery.
In recent years, the archery population has increased in terms of hobbies and health.

None

  The plunger is a tool for flying an arrow straight. It was approved for use in 1972, with a spring inside, and when it fires an arrow, it presses the pressure point by the paradock phenomenon. And it has the function of reducing pressure with a spring and reducing the paradox. This plunger also varies slightly depending on the shooter, so you need to make adjustments that suit you.

As shown in FIG. 6B, many conventional plungers are used in such a manner that the outer circumference of the arrow and the cylindrical Teflon (registered trademark) material used for the tip of the plunger are in line contact. .
For this reason, when a Teflon chip material is used for a long time, the Teflon material at the tip of the plunger is worn away.

  Applying oil to this anti-wear measure will cause dust and change its performance. When the rest is attached, the center of the Teflon material of the chip is used as shown in FIG.

In order to cope with the conventional problems as described above, the present invention improves the performance by changing the plunger configuration from the conventional one to improve the probability of hitting the bow and arrow, and also improves the durability during use. It also has.
The tail invention according to claim 1 is a plunger assembly (100) of a bow tool used by being attached to a handle portion for guiding an archery arrow, and includes a cylindrical plunger body (3) and the plunger body (3). A cylindrical adjustment shaft (2) to be inserted from one end of the hollow portion, a spring (6) disposed at the tip of the adjustment shaft (2) in the hollow portion of the plunger main body (3), and the plunger main body In the hollow part of (3), the spherical third ball (8) disposed at the end opposite to the tip of the adjustment shaft (2) of the spring (6), and the hollow part of the plunger body (3) A spherical first ball (9) having a diameter larger than that of the third ball (8) disposed on the opening side further than the position of the third ball (8), and the plunger body (3) Hollow part In the above, the circle of the hollow portion is in contact with the first ball (9) and the third ball (8) between the first ball (9) and the third ball (8). A plurality of circumferentially arranged second balls (7) having a smaller diameter than the third balls (8), the spring (6), and the first ball in the hollow portion of the plunger body (3). One ball (9), the second ball (7), and the third ball (8) are held in a state where a part of the first ball (9) is held in the plunger body ( 3) A plunger assembly (100) for a bow, comprising a holding portion (a) for exposing to the outside.
The invention according to claim 2 is the plunger assembly (100) of the bow tool according to claim 1, wherein the material of the first ball (9) is a fluororesin.
The starting point according to claim 3, wherein the adjusting shaft (2) is formed with a screw (2a) at least at a part of its outer shape, and is fitted to the screw (2a) formed at an outer diameter portion. The nut (1) having (1a) is inserted so that the insertion position with respect to the plunger main body (3) can be adjusted, and the nut (1) is fixed to the plunger main body (3) by a fixture (12). The plunger assembly (100) according to claim 1 or 2, wherein the plunger assembly (100) is provided.

By changing the configuration of the plunger assembly (100) of the present invention from the conventional one, that is, the cylindrical pin (chip) used at the tip of the plunger contacting the arrow is replaced with a large Teflon ball and a ball. Between <Medium>, use a steel ball <small> set inside the plunger. In addition, it comprised so that a spring load could be performed on the side surface of a ball <medium> by screwing to an appropriate load with a coil spring with an adjustment shaft. Therefore, the conventional problems can be solved and the following effects are exhibited.
B) The contact between the outer circumference of the arrow (shaft) and the plunger is changed from a line contact to a point contact (see Fig. 2), and the linear wear of the cylindrical Teflon material at the tip of the plunger becomes a point contact spherical wear. Increased durability.
B) Since the portion where the arrow (shaft) and the plunger are in contact is a point contact rolling contact, the influence (*) on the progression of the arrow is almost eliminated, and the hit rate hitting the arrow is increased.

☆: That is, sliding friction force F = KW, rolling friction force f = kw
However, K, k, friction coefficient, W, w, coil spring force c) Plunger chip Teflon material wear, conventional products have line contact wear with the shaft (shaft) Although the durability and the accuracy of hitting were not good, in the present invention, the contact with the ball <large>, the ball <medium>, and the ball <small> is due to the rolling contact, that is, Unlike the conventional case, the contact between the ball <large> and the outer periphery of the arrow is changed from the sliding contact to the rolling contact.

Therefore, the need for readjustment of the spring is reduced, and, of course, the hit rate is increased because the influence of the arrow in the traveling direction is small.
D) When adjusting the coil spring, it can be easily done with the thumbscrew 13 and the wing nut 14.

   (In the case of the second embodiment in FIG. 7)

It is an external view of the plunger assembly used for the archery of this invention. 1 is a cross section AA of the present invention FIG. Details of the main part of FIG. 1 of the present invention (a) Plunger body (b) Adjustment shaft (c) Knob nut (single side cross-sectional view) (A) (a) Relationship between arrow and plunger assembly attached to archery body (b) Appearance of conventional plunger Example of attaching plunger plunger to conventional archery body (B) Conventional (a) Name of each part of archery main body (example of twin stabilizer type) (b) Position diagram of mounting relation between conventional arrow string (61), plunger (100) and center of bow Second embodiment of the present invention (a) Plunger assembly <Partial single side sectional view> (b) Plunger body (single side sectional view)

In describing the plunger assembly (100) of the present invention for use in the archery (50), an outline of the related places of use will be described below.
The appearance of the archery <side view> is shown in FIG.
An upper rim (53) and a lower rim (54) protrude from both sides of the handle (51). A string (string) is attached to both ends of the rim, and a stabilizer (66) (the figure shows a twin type) is attached to the handle.

In order to aim, the site (64) to be used is also used.
The arrow (55) has a point <57> attached to the tip of a round rod-like straight shaft (56). FIG. 6A shows a schematic diagram in which a feather (58) is attached to the rear end of the arrow, and the knock (69) of the notch is applied to the string (61) at the end of the arrow.

In addition, the attachment condition of the plunger assembly (100) of this invention was shown in FIG.6 (b).
FIGS. 4 to 6 show detailed views of attaching the plunger assembly when aiming by attaching the plunger assembly (100) to the main part of the archery.
It was written for ease of understanding.

  In addition, as you can see from the comparison of the parts related to the archery when installing the plunger assembly, the present invention is compatible with the conventional assembly for the plunger assembly (screws of the same size). ) To improve the quality of durability and improve only the stability problem part of the arrow path.

In the conventional plunger assembly shown in FIG. 6, the inner screw of the knob nut (1c) and the adjusting shaft (2) are screwed together, and the outer diameter screw (3g) of the plunger body 3 is attached to the handle portion of the archery. Thread with a mounting screw (not shown).
At this time, the plunger body 3 is fixed with a fixing nut in order to prevent the plunger body 3 from loosening.

  The conventional problem is that the tip of the plunger 9 can be cut into a semicircular shape with a cylindrical chip and an archery arrow (shaft (56)), so only the worn part of the plunger tip is replaced. At present, the archery competition or practice is being carried out.

Therefore, every time it is replaced due to wear, fine adjustment of the contact gap between the outer periphery of the arrow (shaft) and the chip is performed each time.
Hereinafter, as shown in FIG. 1, the present invention has a configuration for eliminating the adverse effects of the archery arrow (shaft 56) due to wear of the tip of the plunger.

  The basic idea was that the contact between the outer circumference of the arrow (shaft) and the conventional cylindrical chip was a “line contact”. The idea that the probability of hitting the target in the course of the arrow after releasing the arrow is high is the idea of switching from the conventional “sliding contact” to the “rolling contact” with a combination of balls (large, medium and small) That is the point.

  Along with this, the pressure that affects the arrow due to the sliding wear of the conventional chip has changed the probability of hitting because the feeling of use different from the beginning and the end of the number of uses that release the arrow is changed. .

The conventional product requires correction such as screwing of the adjusting shaft (2) each time in order to correct the gap due to wear. However, since the present invention has a ball construction formula, the labor is eliminated.
FIG. 1 shows a configuration of a first embodiment of a plunger assembly 100 of the present invention. Reference numeral 1 denotes a knob nut made of an aluminum material or a steel material to be screwed with the adjusting screw 2.

A screw for fitting a set screw is provided in the positioning groove 3f of the plunger body 3 on the outer periphery, and a screw for a fixing screw 11b (standard holed screw) is provided on the opposite side.
2 is for lightening the tension of the coil spring 6 on the outside, and has a screw 2a screwed to the knob nut 1 at one end.

3, the plunger which is the point of the present invention has a screw attached to the handle 51 of the archery (bow body) on the outside.
On the inside, the coil spring 6 is used to apply pressure to the ball (large) 9.

In order to reduce the influence of the frictional contact resistance with the ball (large) 9 in contact with the arrow, the ball <medium> 8 and the ball (small) 7 are used in combination.
The other end has a straight (shaft tube) shape for compressing the coil spring 6, and an O (O) ring groove 2c made of a rubber material is provided in the middle of the shaft tube. A flange 3e for fitting a set screw is provided in the positioning groove 3f of the plunger body 3 on the outer periphery.

4 is an O (O) ring using an annular rubber material having an O-shaped cross section.
Reference numeral 5 denotes a fixing nut used to prevent loosening when the plunger body 3 is mounted on an archery bow, and is made of aluminum or steel.

  A fixing screw (11a) for preventing loosening of the screw is provided outside the fixing nut.

Embodiments will be described below with reference to the accompanying drawings.
Reference numeral 100 denotes a plunger assembly used in the archery of the present invention.
1 has an inner diameter of a screw 1a to be screwed with an adjustment screw (2), and a setscrew (1c) for fitting into a fitting groove for positioning of the plunger main body 3 on the outside. On the opposite side, there is a knob (grip) nut having a set screw (1d) for fixing the plunger body 3 and made and shaped from aluminum or steel. (See Figure 3c)
Reference numeral 2 denotes an adjustment shaft made of a steel material used for adjusting the tension of the coil spring 6 on the inner diameter of the plunger body 3.

  3 has a screw 3g, a circumferential groove 3f, and a flange 3e on the outside, and has a hollow diameter as a housing of the coil spring 6 on the inside, and one end is a ball (large), This is a plunger body made of steel with a stepped diameter.

Note that one end is shaped into a conical diameter to prevent the ball from falling off after the ball (large) is assembled, and the end is shaped by “caulking” after the ball (large) is inserted. (Refer to part a in Fig. 2)
Reference numeral 4 denotes a rubber O (O) ring for preventing “backlash” between the adjustment shaft and the plunger.

  Reference numeral 5 denotes a fixing nut made of an aluminum material or a steel material for preventing the fall after the plunger assembly (100) is attached to the handle (51) of the main body of the archery (50). In addition, a set screw 11a for preventing loosening of the screw is provided outside the fixing nut.

Reference numeral 6 denotes a steel coil spring used to adjust the strength of the contact pressure between the outer periphery of the archery arrow (shaft 56) and the ball (large).
7 is a steel ball (small ) used 3 to 5 on the inside of the plunger body 3 .

Reference numeral 8 denotes a steel (or medium) ball of a steel material or a fluorine resin material used inside the plunger body 3 . It is used to make the contact between the ball (large) and the shaft of the arrow into a rolling contact.

  9 is a ball that contacts the outside of the archery arrow (shaft 56), and uses a fluororesin (trade name; Teflon) material with a low friction coefficient to reduce the influence of the arrow path (large). In addition, the friction coefficient between steel and Teflon resin that affects the performance of the arrow path was 0.09 (measured value), and a particularly small value was used.

Therefore, the overall frictional force applied to the arrow shaft by adopting the ball (sphere) and the fluororesin material has become a remarkably small value (about 1/4) compared to the conventional one, eliminating the obstruction of the arrow path.
Reference numeral 11 is used to prevent loosening of the screw, and is a set screw made of steel.

11a Set screw (a), for plunger nut,
11 b Set screw (b),... Knob nut 12 is a steel set screw fitted in the positioning groove of the plunger body 3 .

13 is a thumb screw made of steel (standard product), see FIG. 7A. 14 is a wing nut (a) made of steel material (standard product), butterfly It is a nut (b). Refer to FIG. 7A. The following names are used to explain the plunger assembly of the archery 50 tool. In addition, the purpose of use or description of the function was omitted.

50 is an archery or a bow 51, a handle 52, a grip 53, an upper rim 54, a lower rim 55, an arrow 56, a shaft 57, a point 58, a feather 59, a rest or an allorest 61, String or string 63, knock point 64, site 65, clicker 66, (twin type) stabilizer 68, handle riser 69, knock

Embodiments will be described below with reference to the accompanying drawings.
Reference numeral 100 denotes a plunger assembly 1 for an archery 1, a knob nut 2, an adjustment shaft 3, a plunger body 4, an O (O) ring 5, a fixing nut 6, a coil spring 7, a ball (small)
8 is the ball (medium)
9 is the ball (large)
11 is a set screw, 11a set screw (a), 11b set screw (b)
12 is a set screw 13 is a thumbscrew 14 is a wing nut, 14a wing nut (a), 14b wing nut (b)
50 is archery
51, handle 52, grip 53, upper rim 54, lower rim 55, arrow 56, shaft 57, point 58, feather 59, rest or allores 61, string or string 63 , Knock point 64, site 65, clicker 66, (twin) stapler 68, handle riser 69, knock

Claims (3)

In the plunger assembly (100) of the bow that is attached to the handle portion that guides the archery arrow,
A cylindrical plunger body (3);
A columnar adjustment shaft (2) inserted from one end of the hollow portion of the plunger body (3);
A spring (6) disposed at a tip of the adjustment shaft (2) in a hollow portion of the plunger body (3);
A spherical third ball (8) disposed in the hollow portion of the flanger body (3) at the opposite end of the adjustment shaft (2) of the spring (6);
In the hollow portion of the plunger main body (3), a spherical first first diameter larger than that of the third ball (8), which is disposed further on the opening side than the position of the third ball (8). A ball (9);
In the hollow portion of the plunger body (3), the first ball (9) and the third ball (8) are interposed between the first ball (9) and the third ball (8). A plurality of spherical second balls (7) having a diameter smaller than that of the third balls (8), which are arranged in the circumferential direction of the hollow portion so as to be in contact with each other;
While holding the spring (6), the first ball (9), the second ball (7) and the third ball (8) in the hollow portion of the plunger body (3), A holding portion (a) for exposing a part of the first ball (9) to the outside of the plunger body (3);
A plunger assembly (100) of a bow, comprising: The plunger assembly (100) of the bow tool according to claim 1, wherein the material of the first ball (9) is a fluororesin. The adjustment shaft (2) has a screw (2a) formed on at least a part of its outer shape, and a nut (1) having a screw portion (1a) fitted to the screw (2a) formed on the outer diameter portion. The insertion position relative to the plunger body (3) is inserted so as to be adjustable,
The plunger assembly (100) according to claim 1 or 2, wherein the nut (1) is fixed to the plunger body (3) by a fixture (12).