JPS6052915B2 - Anti-vibration handle device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vibration-isolating handle device, which can sufficiently prevent vibrations occurring in the handle of a hand-held vibrating machine such as a rock drill, and improve the operability of this type of vibrating machine. The present invention relates to a vibration-proof handle device.

Conventionally, vibration isolation for handles for hand-held vibrating machines such as rock drills has mainly been done by installing anti-vibration rubber between the vibrating body and the handle or around the hand, and using the anti-vibration rubber to insulate the vibrations of the vibrating body. The method of doing so is adopted. However, in the case of elastic materials such as rubber, the vibration insulating effect against vibrations in a relatively high frequency range is low, and it is difficult to prevent violent vibrations such as those caused by a rock drill. The reality is that we have not yet achieved a satisfactory level of prevention of harmful vibrations that cause industrial accidents.

Furthermore, even if a certain degree of vibration isolation effect can be obtained, when an elastic member such as vibration isolation rubber is used, there are problems such as the handle being soft to operate and not being able to operate properly against the vibrating body. . The present invention was devised to effectively solve the above-mentioned conventional problems.

An object of the present invention is to provide a vibration-isolating handle device with a simple structure that can sufficiently prevent vibrations occurring in the handle of a hand-held vibrating machine such as a rock drill, and improve the operability of this type of vibrating machine. be.

First, in order to facilitate understanding of the vibration damping effect of the device according to the present invention, a vibration system that is vibrationally equivalent to the present invention will be explained based on FIG.

In FIG. 1, 1 is a vibrating body, above which a weight 3 of mass M is connected to the vibrating body 1 via a spring 2 with a spring constant, and further above the weight 3 is a spring with a spring constant. 4
A weight 5 of mass m is connected to weight 3 via.

The vibrating body 1 vibrates vertically with an amplitude u and a frequency ω, and the weights 3 and 5 are vibrated vertically by the vibrating body 1. If the amplitude of the weight 3 at this time is X, the amplitude u of the vibrating body 1 and the weight 3
The following relationship holds between the amplitude of

As is clear from equation (1), ω=! If the mass m of the weight 5 or the spring constant k of the spring 4 is set appropriately so that k/m, the numerator of equation (1) becomes zero, and the amplitude x of the weight 3 can be made zero.

ω=! The frequency k/m is the natural frequency of the weight 5,
After all, roughly speaking, the frequency ω of the vibrating body 1 and the natural frequency of the weight 5 match, and the phases of the vibrations of the vibrating body 1 and the weight 5 are opposite to each other, and the vibration is transmitted to the weight 3 via the springs 2 and 4. The acting forces are canceled out, and the vibration of the weight 3 is suppressed. Figure 3 is a graph qualitatively showing the relationship between the frequency ω and 1x1uI, and in the vicinity of the frequency ω6 = Jk/m, Ixlul is close to zero, and from Figure 3, K, If the value of m is set to ω=Jk/m for the frequency ω of the vibrating body 1, then
It can be seen that weight 3 hardly vibrates.

In principle, the device of the present invention is such that a part of the weight 3 is formed into a handle shape so that the vibrations of the vibrating body are not transmitted to the handle. In FIG. 2, the weight 5 in FIG. 1 has a mass m
An example is shown in which the weight 6 is divided into two weights 6 and 7, 1 and M2, and the weight 6 is connected to the weight 3 via a spring 8 with a spring constant of k1, and the weight 7 is connected to a weight 3 via a spring 9 with a spring constant of K2. ing.

In this example as well, Jk/m=! ▼? If Kl, ml and K2, m2 are set so that = J@2, the frequency ω
The graph of 1x1u1 for 1x1u1 is the same as in FIG. This example has the advantage that the weight 5 and spring 4 shown in FIG. 1 can be separated and made smaller. A preferred embodiment of the present invention, which is based on the above-described principle, will now be described in detail with reference to the accompanying drawings.

In FIG. 4, 10 is a vibrating body such as a rock drill that vibrates in the vertical direction, and 11 is perpendicular to the vibrating body 10! It is a rod with a circular cross section that is connected to the

An upper plate 12 and a bottom plate 13 are provided at the upper and lower ends of the rod 11, respectively, and are enlarged radially outward from the rod 11. Further, a threaded portion 14 is formed on the bottom plate 13 to protrude downward, and by screwing the threaded portion 14 into a screw hole (not shown) provided in the vibrating body 10, the rod body 11 is attached to the vibrating body 10. It is configured to be firmly connected to the 15 is a substantially cylindrical mass body, and the rod 11 is inserted into a through hole 16 passing through the axis thereof.

The inner diameter of the through hole 16 is slightly larger than the outer diameter of the rod 11 so as to allow smooth movement of the mass body 15 in the vertical direction along the rod 11 and to restrict horizontal movement of the mass body 15. It is formed. Also, the mass body 15 and the upper plate 12
A coil spring 17 is provided between the mass body 15 and the bottom plate 13, and a coil spring 18 is provided between the mass body 15 and the bottom plate 13, and the mass body 15 is supported by these coil springs 17 and 18.
Ru. A leaf spring 19a is provided with one end embedded in the mass body 15 and further welded to the mass body 15, and the other free end extending horizontally outward from the radius of the mass body 15.

A cylindrical weight 20a is attached to the tip of the leaf spring 19a. Furthermore, a grip member 21 a in the shape of a cylinder with a bottom covers the leaf spring 19 a and the weight 20 a while being spaced apart therefrom, and its open end 22 is fixed to the mass body 15 . In addition, the mass body 15 includes a leaf spring 19a, a weight 20a, and a rod 11 having the same configuration as the grip member 21a and in the opposite direction.
leaf spring 19b1 weight 2 so as to be symmetrical about the axis of
0b1 grip members 21b are provided respectively. Furthermore, in order to restrict rotation of the mass body 15 around the rod 11 as an axis, as shown in FIG. A protruding portion is provided, and the protruding portion 23 is provided with a guide hole 25 through which a guide rod 24 is inserted, one end of which is attached to the upper plate 12 and the other end of which extends vertically downward. ing.

In this embodiment, the mass body 15 is the first mass body, and the coil springs 17 and 18 are the first elastic members.

Further, the weights 20a and 20b are second mass bodies, and the leaf springs 19a and 19b are second resilient members. Next, the operation of this embodiment will be described.

When the vibrating body 10 vibrates, the vibration is transmitted to the bottom plate 13 and the rod 1.
1, is transmitted to the upper plate 12, and is further transmitted to the coil spring 17, 1
8 to the mass body 15 and the grip members 21a, 21b, and the mass body 15 and the grip members 21a, 21b vibrate.

The vibrations of the mass body 15 are transmitted to the weights 20a, 20b via leaf springs 19a, 19b, respectively, and
vibrates. By the way, the vibration system of this embodiment and the second
Comparing the vibration system shown in the figure, the mass body 15 of this embodiment
Furthermore, the grip members 21a and 21b are weights 3 of mass M shown in FIG.
It can be seen that the two coil springs 17 and 18 correspond to spring 2 with a spring constant K.

Further, the weights 20a and 20b of this embodiment correspond to the weights 6 and 7 having masses Ml and m2 shown in FIG. 2, respectively, and the leaf springs 1
It can be seen that 9a and 19b correspond to springs 8 and 9 with spring constants Kl and k2, respectively. Therefore, weight 2 of this example
The masses of the leaf springs 0a and 20b are Ma and mb, respectively, and the spring constants of the leaf springs 19a and 19b in the vertical direction are Ka and Ka, respectively.
K, and furthermore, for the vertical frequency ω″ of the vibrating body 10, ω″=! Ka/Ma=! If Ma, ka and Mb, kb are set to satisfy the condition Kb/Mb,
As is clear from the above theoretical explanation, the mass body 15
And the grip members 21a, 21b hardly vibrate. Furthermore, even if there is a fluctuation in the vertical frequency ω'' of the vibrating body 10, !Ka/Ma and Vkb/
If Ma, ka and Mb, kb are adjusted and determined so as to position Mb, the grip members 21a, 2
Vibration of 1b can be prevented. In fact, in vibration experiments using the device of this example, it was confirmed that the vibrations transmitted from the vibrating body to the grip member 21, that is, the handle, were significantly attenuated, and harmful vibrations that could cause industrial accidents such as white wax disease could be almost completely prevented. has been done.

Even if the vibrating body 10 occasionally vibrates or fluctuates in a direction other than the vertical direction, the rod 11 keeps the grip members 21a, 21b
The movement of the mass body 15 in the horizontal direction is regulated, and the rotation of the grip members 21a, 21b and the mass body 15 is regulated by the guide rod 24.

In the above embodiment, only one of the coil springs 17 and 18 may be omitted. Further, for example, the number of coil springs 18 may be increased to two, or a bellows, ring spring, etc. may be used instead of the coil spring. Further, leaf spring 19a1 weight 20a1 grip member 21a
The same configuration is further attached to the mass body 15, for example, 3
A handle may be provided in the direction, or the leaf spring 19a1, the weight 20a1, and the grip member 21a may be omitted, or only the leaf spring 19a1 and the weight 20a may be omitted.

The grip members 21a and 21b may have any shape as long as they are spaced apart so that they do not come into contact even when the leaf springs 19a and 19b vibrate, and may have openings as appropriate.
The leaf springs 19a and 19b can be freely replaced with bar springs or the like. By making the weights 20a and 20b splittable so that the mass can be increased or decreased, or by making the weights 20a and 20b
, 20b on the plate springs 19a, 19b may be made variable so that the natural frequencies of the weights 20a, 20b can be changed. Further, the cross section of the rod 11 is made square, and the through hole 16 of the mass body 15 is also made square to match the rod 11, so that the rotation of the mass body 15 is restricted, and the protrusion 23 of the guide rod 2 is omitted. You may.

As is clear from the above explanation, if the device according to the present invention is used as a handle of a hand-held vibrating machine such as a rock drill, transmission of harmful vibrations generated by the vibrating machine to the handle can be almost completely suppressed, and Since a material with a large elastic modulus such as vibration-proof rubber is not used, it is possible to exhibit excellent effects such as further improving the operability of vibrating machines.

[Brief explanation of the drawing]

Fig. 1 is a principle diagram for explaining the vibration isolation effect of the device according to the present invention, Fig. 2 is another principle diagram for explaining the same vibration isolation effect, and Fig. 3 is a diagram similar to Fig. 1 or 2. FIG. 4 is a graph showing the relationship between the amplitude of a weight having a mass M and the frequency of a vibrating body, FIG. 4 is a longitudinal sectional view showing the device according to the present invention, and FIG. 5 is a side view of the same. In the figure, 10 is a vibrating body, 11 is a rod, 15 is a first mass body (mass body), 17 and 18 are first elastic members (coil springs), and 19a and 19b are second elastic members. (plate spring), 20
a and 20b are second mass bodies (weights), and 21a and 21b are grip members.

Claims (1)

[Claims] 1. A rod connected to the vibrating body and having its axis in the vibration direction of the vibrating body, a first mass body fitted into the rod so as to be slidable along the axial direction, and the rod and the first mass body. a first elastic member that is interposed between the first mass body and the second mass body and supports the first mass body so as to vibrate along the axial direction of the rod; a second mass body connected to the first mass body via a resilient member; and a second mass body extending from the first mass body and provided to cover the second resilient member while being spaced apart from the second mass body. A vibration-proof handle device comprising a grip member.