Road structure – process – or apparatus – Apparatus – Means to agitate material
Patent
1994-03-14
1995-10-31
Britts, Ramon S.
Road structure, process, or apparatus
Apparatus
Means to agitate material
366123, 366128, 404116, B01F 1100
Patent
active
054623880
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a vibrator, especially inner vibrators, for compacting concrete etc. (construction material), having an unbalanced shaft that is driven by an electric motor with inner rotor mounted in the housing, the electric motor being insertable into the cylindrical interior enclosed by the housing mantle through an open end face, the electric motor having a cylindrical stator pack that is insertable with sliding fit into the housing mantle and that is secured against rotation relative to the housing mantle, wherein the housing mantle on the open end face is closeable by an upper housing part that is axially insertable into the housing mantle and in the closing position is secured against axial displacement within the housing mantle.
A securing of the stator pack against rotation is necessary for vibrators of the aforementioned kind because the counter torque acting during operation onto the stator pack would otherwise lead to a displacement of the stator pack in the circumferential direction of the housing mantle.
In the known vibrators of the aforementioned kind the stator pack is secured against rotation relative to the housing such that it is inserted under press-fitting conditions into the housing mantle. This requires a precise manufacturing of the inner surface of the housing mantle and the outer surface of the stator pack, the use of a press during mounting, and the use of a special removal device if demounting is required.
It is an object of the invention to provide a vibrator according to the preamble of claim 1 with which the stator pack and the inner surface of the housing mantle can be manufactured with greater tolerances as in the known vibrators and which is easy to mount and demount compared to the known devices.
SUMMARY OF THE INVENTION
The vibrator for compacting construction materials according to the present invention is primarily characterized by:
a housing having a housing mantle with a first end face, the housing mantle having a cylindrical interior;
the housing further comprising an upper part for closing the housing at the first end face of the housing mantle, the upper part axially inserted into the housing mantle and secured in a closing position thereof against displacement in an axial direction of the housing;
a support surface (end face of a ring) axially fixedly connected within the housing mantle and extending radially inwardly;
an unbalanced shaft;
an electric motor drivingly connected to the unbalanced shaft and positioned within the housing, the electric motor having an inner rotor and an outer cylindrical stator pack;
the electric motor inserted into the cylindrical interior of the housing mantle from the first end face;
the stator pack inserted into the cylindrical interior of the housing mantle with sliding fit and secured against rotation relative to the housing mantle;
the stator pack having a recess;
a spreading element made of spring steel for securing the stator pack, the spreading element inserted into the housing mantle through the first end face and positioned on the stator pack before closing the housing;
the spreading element clamped between the support surface and the upper part of the housing;
the spreading element having at least one axially extending projection for form-fittingly engaging the recess of the stator pack; and
the spreading element further having a plurality of spreading pawls resting on the support surface, the spreading pawls being distributed evenly spaced about an inner circumference of the housing mantle and being forced against the housing mantle when axially clamping the spreading element.
Preferably, the spreading element is a planar flat stamped body with a first and a second side and has a circular center piece with bores for receiving voltage supply lines to the electric motor. The stamped body has tongue-shaped projections forming the spreading pawls and a further radial projection that is longer than the tongue-shaped projections and has parallel lateral edges. The tongue-shaped projec
REFERENCES:
patent: 3784168 (1974-01-01), Schneider et al.
patent: 4199271 (1980-04-01), Riedl
patent: 4667916 (1987-05-01), Richards
Becker Robert W.
Britts Ramon S.
Lisehora James A.
Wacker-Werke GmbH & Co. KG
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