Joints and connections – Articulated members – Pivoted
Reexamination Certificate
1999-02-22
2001-04-10
Kim, Harry C. (Department: 3629)
Joints and connections
Articulated members
Pivoted
C403S291000, C404S133100
Reexamination Certificate
active
06213673
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a connecting device for connecting a handle or control bar to the top mass of a hand-controlled vibration plate in a sprung manner, such that the handle or control bar is pivotable in relation to the vibration plate about a pivot axis that is essentially horizontal and perpendicular to the direction of forward movement of the vibration plate.
Several different, known connecting devices have been proposed for the abovementioned purpose, but they are all either of relatively complicated construction and correspondingly susceptible to faults or leave much to be desired with regard to the function to be satisfied by them, on the one hand, of effecting good, relatively soft springing when the vibration plate is running in a straight line and, on the other hand, of ensuring precise steerability as well.
2. Description of the Related Art
U.S. Pat. No. 4,643,611 discloses a vibration plate in which a control bar is fasted to the top mass via a rubber buffer element that serves to damp out shocks. Similar arrangements are also disclosed by GB-A-1 018 746 and U.S. Pat. No. 2,771,012.
OBJECTS AND SUMMARY OF THE INVENTION
The invention is based on the object of specifying a connecting device which satisfies the abovementioned functional properties in an excellent manner with a simple constructional configuration that is not susceptible to faults.
According to the invention, the abovementioned object is achieved by the connecting device having two pairs, which are arranged at a fixed mutual distance in the direction of the pivot axis and each comprise a first connecting element in the form of a rubber buffer and a second connecting element in the form of a ring, which surrounds the rubber buffer essentially without play and can slide coaxially in relation to the pivot axis, one connecting element of each pair being fastened to the top mass and the other connecting element being fastened to the handle or control bar.
Using the inventive connecting device, the control bar or the handle can be pivoted up and down effortlessly, the ring rotating about the rubber buffer and vibrations occurring when the machine is moving straight ahead being associated with light deformations of the elastic material of the rubber buffer, to which vibrations the latter does not present any firm resistance, so that good, soft damping is ensured. If, however, the control bar or the handle is pivoted to the side, the rings at the fastening points of the pairs, which are located at a distance, exert considerable forces, which act in opposite directions, on the rubber buffers, the latter presenting a relatively firm resistance to said forces, with the result that the steering force is transmitted very effectively to the top mass and hence to the vibration plate.
In this connection, the features of subclaims
4
and
5
are particularly advantageous as preferred configurations since, by means of said features, the desired soft springing when the vibration plate is moving straight ahead, and the introduction of a firm resistance to lateral steering movements, are favored in a quite particular way, even at a small deflection.
The further subclaims relate to advantageous configurations, which are likewise preferred, of the connecting device as claimed in patent claim
1
.
REFERENCES:
patent: 2209382 (1940-07-01), Blattner
patent: 2629364 (1953-02-01), Anderson
patent: 2771012 (1956-11-01), Jackson
patent: 3232188 (1966-02-01), Frohnauer
patent: 3782845 (1974-01-01), Briggs et al.
patent: 4643611 (1987-02-01), Pilachowski
patent: 5335522 (1994-08-01), Stadelmann et al.
patent: 2350481 (1975-05-01), None
patent: 1018746 (1966-02-01), None
Jungwirth Norbert
Kocas Bülent
Boyle Fredrickson Newholm Stein & Gratz S.C.
Kim Harry C.
Wacker-Werke GmbH & Co. KG
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