JPS594264B2 - Vibration suppressing handle device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vibration-damping type handle device necessary for electric tools, compressed air tools, and the like.

Even if this kind of conventional device has a considerable degree of vibration allocation, the interposition of an elastic member as a vibration damping member makes the operability soft, and it is difficult to center the device with power tools, etc. This was a problem as it caused unsteadiness.

SUMMARY OF THE INVENTION An object of the present invention is to provide a vibration-damping type handle device that can substantially damp harmful vibrations even though the handle member is substantially rigidly supported.

The gist of the present invention for achieving the above object is set forth in the claims set forth in the header.

The present invention will be described in detail below with reference to one embodiment shown in the drawings.

FIG. 1 is an exploded side view, and FIG. 2 is an assembled side view, mainly a sectional view.

In these figures, reference numeral 1 is designed to receive vibrations from a harmful vibration source (not shown) emitting harmful vibrations, such as a casing of an electric tool, a compressed air tool, or a small internal combustion engine, through a connecting part 2. A vibration receiving member comprising:
In the illustrated example, it is configured in the shape of a U-shaped or channel-shaped member, but it is not limited thereto.

However, the vibration motion received at the left and right ends 1a and 28
The vibration must be transmitted separately toward the grip member 3.

Attached to the ends 1a and 2a are first oscillating masses 4 and 5, preferably symmetrical and of equal mass, respectively.

As for the fixing means for this purpose, the illustrated example shows the simplest and reliable form of welding or brazing, but other types of fixing or fastening such as bolts/nuts, rivet joints, etc. means may be used.

The first vibrating masses 4 and 5 have a through hole 4a in their center.
, 5a are provided, but this is an essential structure.

Further, it is most suitable for the contour shape to have a circular end face, but it can also have any shape such as a square, hexagon, or rectangle if necessary.

Each of the first vibrating masses 4 and 5 is, at its simplest, solid (having a structure in which the contents are integrally packed) (in the case of Fig. 2), a cup or deep dish shape, and its space 4b
, 5b may be filled with rubber or semi-hard or hard plastic (as shown in Figure 1).

Of course, it is preferable that at least the main part (the part that carries the contour and the mass) is made of metal.

This also applies to the second and third vibrating masses that will be explained later.

4c and 50 are spring receivers integrally provided on the outward sides of the first vibrating masses 4 and 5, preferably in the form of male protrusions as shown. However, it may instead be in the form of a female annular groove (not shown).

Note that the above-mentioned through holes 4a and 5a have spring receiver portions 4c and 5c.
Needless to say, it is provided so as to penetrate in a straight line.

6 and 7 are buffer springs.

Preferably, they should be made of the same material and shape in pairs.

However, their arrangement is symmetrical.

Although the illustrated example is in the form of a coil spring as a typical example, since it is a buffer spring, it goes without saying that it may be replaced with a plate spring, disc spring assembly, bellows body, or any other known type as the case may be. These are design matters that can be adopted in the invented device.

8 and 9 are second vibrating masses, preferably made of metal.

Reference numeral 9a is a through hole provided in the center in the longitudinal direction, and reference numerals 8b and 9b are spring receivers.

8c and 90 are female screw holes provided in the second vibrating mass bodies 8 and 9 in the horizontal direction perpendicular to the central axis, and these mass bodies are screwed into the end of the rod body 20. 1
This is for fixing using 0 and 11.

Of course, similar setscrews can also be used not only from above, as shown, but also from below, in order to make the required fixation even stronger and more reliable.

12 and 13 are third vibrating mass bodies, each having central holes 12a and 13a and horizontally arranged female screw holes 12b and 13.
b, and set screws 14 and 15 can be used for the latter.

Their structure and direct action is based on the second vibrating mass 8
Since it is the same as that explained for and 9, the explanation will be omitted.

Note that these mass bodies 12 and 13 are fixed to the inner wall surface of the sleeve-shaped grip portion 3 via adhesive layers 16 and 17.

Note that the fixing means for this purpose is not limited to the use of an adhesive layer, and various conventionally known means can be used, such as the use of at least one pair of set screws, rivet fixation, etc.

Note that the grip portion 3 and the rod body 20 are not shown in FIG. 1 due to the drawing space.

The operation of the device of the present invention having the above structure will be explained as follows.

Harmful original vibration transmitted from a power tool or the like is transmitted to the vibration receiving member 1 via the connecting portion 2, and is transmitted to the second vibrating mass bodies 4 and 5 with the same amplitude and frequency.

However, if the arm-shaped narrow openings 8 and 1b have elasticity even if viewed from the vibration system, some vibration damping effect will be obtained already at the and σ positions.

The vibration system on the left side is centered on the center line C of the device, and the mass body 4
The vibration is attenuated by the vibration spring 6 and transmitted to the second vibrating mass body 8, and the vibration on the left side of the rod body 20, which can have a diameter of about 5 to 8 mm in the case of an ordinary hand-held tool, is transmitted to the second vibrating mass body 8. 3rd through
is transmitted to the vibrating mass 12, which causes the mass 12 to vibrate in a significantly damped manner.

A similar vibration attitude also occurs in the vibration system on the right side of the center line C, and is attenuated from the first vibrating mass body 5 via the spring γ and transmitted to the second vibrating body 9, and is transmitted to the right half of the rod body 20. is transmitted to the third vibrating mass body 13 via
vibrates in a significantly damped manner.

The rod 20 may be omitted between the third vibrating masses 16, 17 as shown, or may be continuous.

If the masses and spring constants of each included vibrating mass body and spring are adjusted appropriately, it will match the center line C, or
Since it is confirmed that there is a point that can be considered as a node of vibration at a point A very close to that point, at least the left and right vibration systems, especially the 3 vibrating masses 12 and 13
can be seen as vibrating in antiphase with each other during most of the vibration.

Therefore, the grip part 3, which is fixed only to the third mass body 12.13, is physically and mechanically more susceptible to vibration sources than other parts of the vibration system. The central part only vibrates as much as or close to node A, whose amplitude can be theoretically considered to be zero. and 1/10~1//3
The original vibration can be damped to about 0.

However, by holding the grip part 3 by hand, the rod 20
directly contacts the inner wall surfaces of the center holes 4a+5a of the first vibrating masses 4, 5, there is a problem that the harmful vibrations are partially transmitted directly to the rod 20, but the vibration still returns to the original 1 //It can be attenuated to about 10.

In the apparatus of the present invention, it is assumed that the left and right vibration systems centered on the center line C are completely symmetrical with respect to each mass and spring constant.

Although this is an explanation of a very simple vibration model, it goes without saying that depending on the degree of vibration that enters from the vibration source through the connecting part 2, it is possible to create a left-right asymmetrical posture. Needless to say, this is a matter of design.

Although the original vibration is complex, including various amplitudes and frequencies, and the direction of the vibration plane is also diverse, it is important to understand whether the vibration system for left and right distribution as described above is correct or Since the structure is symmetrical in outline, experimental results show that despite such complex vibrations, the allocation effect is extremely effectively achieved, and the desired effect of the present invention is achieved to a practically sufficient degree. It has been found that the objective can be achieved.

Note that the spring can be replaced with something like rubber.

[Brief explanation of the drawing]

1 is a schematic exploded side view of the device of the invention, and FIG. 2 is a similarly schematic side view of the device of the invention shown in its assembled state. In these drawings, 1... vibration receiving member. 2...Connection part. 3...Grip part. 4, 5... first vibrating mass body. 6, 7... Spring constituting the buffer member. 8, 9... second vibrating mass body. 10.11...Press screw. 12゜13...Third vibrating mass body.

Claims (1)

[Claims] 1. A vibration receiving member that is firmly connected to the harmful vibrating body via a connecting portion and receives the original vibration, and a pair of first vibrating masses that are respectively fixed to both ends of the receiving member; A pair of second vibrating masses are connected outwardly to the vibrating mass body via shock absorbing members such as springs or rubber; a third vibrating mass body, a grip member fixed or fixed to the third vibrating mass body, and arranged concentrically with respect to the first, second, and third vibratory mass bodies; A vibration-suppressing handle device comprising a rod fixed to a second and third vibrating body.