Vibrating plate

Details Vibrating plate Vibrating plate

1984-11-15

1986-09-02

Meister, James M.

Tool driving or impacting

Including means to vibrationally isolate a drive means from...

16111R, 16116R, 267 75, F16F 1508, E02D 3046

Patent

active

046090550

DESCRIPTION:

BRIEF SUMMARY
This invention relates to a so-called vibrating plate, that is a device which comprises a compactor plate with engine and vibration generator, said compactor plate being adapted for application to the ground. Such vibrating plates can be used for compaction of sand and gravel as well as asphalt coatings. Such vibrating plates have a handle by which the vibrating plate is operated. A difficult problem associated with this type of tool resides in the transmission of vibrations from the vibrating plate to the operator. Therefore, one has tried in different ways to dampen the transmission of vibrations. Such a prior art device for damping the transmission of vibrations is described in No. EP-A-0,081,079 and the corresponding published Swedish patent application Nos. SE-A-8107365-2 and 8203697-1. This publication describes a handle arrangement in which biased elastomer springs are utilized between the operating member and the shaft member.
Another prior art device for damping vibrations between a vibrating tool and a handle is described and shown in U.S. Pat. No. 4,282,938, where the damping of the vibrations is absorbed with the aid of leaf spring elements and a magnetic damper.
The first of these prior art devices have proved to be unsatisfactory for damping vibrations from a vibrating plate even though this device is useful for light-weight equipment. The last-mentioned prior art device is disadvantageous in that it is expensive and requires much material.
This invention aims at providing a vibrating plate in which the operating and shaft members of the handle are interconnected by at least one spring element the stiffness of which has been adapted to the mass of the operating member such that an excellent vibration insulation is obtained. The invention also aims at providing a vibrating plate the operating member of which is highly insulated from the remaining vibrating plate by means of a simple but effective vibration insulation device.
According to the invention, a vibrating plate of the type outlined in the foregoing shall be characterised in that the mass of the operating member and the spring stiffness of the spring element or elements are so adapted to one another and to the vibrating frequency of the vibrating plate that the relationship between the frequency of the vibration generator and the characteristic frequency of the operating member with regard to translational and rotational movements respectively along and about the axis of the operating member and respectively along and about two directions at right angles to said axis and also to one another, is >.sqroot.2. Thus the invention is based on the observation that one has to adapt the spring stiffness and the mass of the operating member in such a way to one another that the characteristic frequencies of the operating member (with regard to said directions) lie substantially below the interfering frequency, i.e. the interfering frequency generated by the vibrating plate. Only in this way is it thus possible to safeguard a high-grade vibration insulation and prevent an amplification of the transmission of vibrations as a result of natural oscillation conditions in the operating member.
According to the invention, it is of special advantage if the operating member is connected at both of its ends to the shaft member of the handle and if each of the spring elements is in the form of an elastomer body which is of approximately hour-glass shape and which is axially arranged in relation to the operating member.
To prevent that the elastomer body bursts under torsion it is of particular advantage to connect the elastomer body rotatably to the operating member or the shaft member.
In a further development of the invention the spring deflection restricting mechanical device is formed by a cup-shaped means which is connected to the shaft member of the handle and has a larger inner diameter than the outer diameter of the part of the operating member projecting into said cup-shaped means. It is particularly advantageous if the part projecting into the

REFERENCES:
patent: 2831463 (1958-04-01), Ekstrom
patent: 3232188 (1966-02-01), Frohnauer
patent: 4401167 (1983-08-01), Sekizawa et al.
patent: 4420989 (1983-12-01), Finkle

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