IL30196A - Vibrating tamping device - Google Patents

Description

A TAMPING DEVICE 28504 A tamping device for compacting concrete asphalt and other materials capable of being the device comprising a motor unit and a compacting unit provided with a compacting shoe at the bottom The two units are connected together by means of a movable linkage system and a connecting rod which forms part of a crank system in the unit and is joined with a coil spring secured to the compacting The two units are each provided with an extension the member the motor unit extending over the compacting unit and the member on the compacting unit extending upwardly past the motor The ends of the link system are connected to the extension members so that the distance between the pivot points of said link system is the greatest ps The present invention is concerned with a device for compacting asphalt and other materials which can be compacted and which vibratory or tamping movements in addition to compacting the material in also cause the to move The device comprises a motor unit and a compacting unit which includes a compactor plate or shoe the said units being movably connected Ordinarily the device can be operated by one and the substantially vertical tamping or vibrating movement is imparted to the compacting unit by means of a crank mechanism connected to a drive motor placed in the motor the magnitude of the mass of the two units being so selected in relation to each other that the motor unit moves only slightly in the vertical direction during the tamping or vibratory movement of the compacting In order to provide a substantially vertical movement the compacting unit in prior art tamping devices of this type is guided by pistons or guide The disadvantage with such a guide however9 is its high sensitivity to tsar and its demand for an effective lubrication Furthermore dust and dirt must be prevented from penetrating into the guide surfaces of the pistons or guide structures which complicates the structure and renders it more The purpose of the present invention is to eliminate these disadvantages and is rc characterised in that the motor unit and the compactor unit are movably connected together via a linkage system which operates in the absence of any special guide In order to impart to the system the greatest possible degree of stability the motor and compacting units are each provided with specials outwardly projecting members by means of which the distance between the pivot points of the link system in the motor and compacting units is as great The moments and horizontal forces arising in the compacting unit during its tamping caused as a of irregularities in the surface being compacted can be effectively taken up by this owing to the relatively long distance between the by pivot points of the linkage and no extra of pistons or guide structures is therefore A suitable linkage system in the present instance comprises two pairs of links the one end of each pair being pivotally connected in the motor unit and the other end of each pair being pivotally connected in the compacting By providin in accordance with the the motor unit and the com actin unit with its res ective extension major and by placing two of the pivot points of the link pairs in said extension the distance the two pairs of links can be resulting in an improved stability of the link The Invention will new be described with reference to the accompanying in 1 shows a longitudinal section of a vibratory tamping device according to the and 2 a of the same taken through the line in The tamping device shown in 1 comprises a motor unit 1 and a compactor unit The compactor unit is provided at the lower end thereof with a compactor shoe The drive motor 4 is arranged on the motor unit by means of a crank elbow imparts to the connecting rod 5 a substantially vertically reciprocating The connecting rod 5 is connected at its lower end with the compactor unit and its compactor shoe 3 via a spring system comprising coil springs A metal casing 7 is arranged around the springs and secured at its lower end to the compactor In addition to being connected together by means of the connecting rod 5 and its resilient attachment in the compactor unit the motor and compactor units are also connected together by means of a pivotal link prising two pairs of links 8 and 9 which are connected in pairs at their one end by resilient means in the motor unit and at their other end by resilient means in the compactor units the resilient connecting means for in motor unit and compactor unit are each provided with especially extension members 10 and which extend downwardly and upwardly over respective the link pair 8 is pivotally connected at at one end in the compactor unit 2 other end is pivotally connected to the extension member 10 of the motor unit In a corresponding manner the link pair 9 is secured to the motor unit 1 at point and the extension member of the compactor unit at point Moments and horizontal forces for by impacts against the bottom surface of the tamping shoe be effectively taken up by the link system owing to the relatively large distance between the securing points and 14 in the motor unit and the compactor unit when practising the invention it is no longer necessary to guide the compactor unit relative to the motor unit by means of guide structures or the In addition to obtaining a simplified and consequently less expensive structure it is now no longer necessary to use special protective casings in the form of bellows or the to prevent the ingress of dust and dirt in particularly tive guide structures The device is in conventional with a frame nounted on the motor unit and supporting two hand grips 17 and a fuel tank In order to dampen still further any vibrations which might be transmitted from the tamping shoe to the motor and thus to the hand grips hand grips may be attached to the frame in a known manner by means of special rubber attachment means tory movements of which are caused by a drive via crank The drive motor is suitably a petrol or dieael Power transmission between motor unit and compactor may also be effected by means of a piston using compressed air or liquid pressure medium as an operating medium without departing from the spirit of the insufficientOCRQuality

Claims (5)

1. » A device for compacting earth, concrete, asphalt and similar plastic materials, said device operating with vibratory and tamping movements and comprising a motor unit and a compactor unit, th© last mentioned unit being brought to the tamping movement by means of a connecting rod which forms part of a crank system characterized in that the motor unit and the compactor unit are moveable in relation to each other in the absence of any frictional guido structures and connected together via a linkage system comprising four linkarms arranged in pairs, the one pair of which at its one end being pivotally connected to an extension portion of the motor unit and at its other end pivotally connected to the compactor unit, and the second link pair at its one end being pivotally connected to an extension portion of the compactor unit and at its other end pivotally connected to the motor unit, said extension portions extending over the compactor unit and the motor unit respectively,

2. The device according to Claim 1, characterized in that the means by which the ends of the link arms are attached in the motor and compactor units and in the extension portions of said units respectively, are resilient.

3. » The device according to Claim 2 characterized in that the resilient attachment of the link arms is provided by means of shear-stressed rubber elements.

4. · She device according to any of preceding claims, characterised in that the connecting rod forms part of a crank system in the motor unit, and is secured to a coll spring which at its other end is secured to the compactor unit. 30196/3

5. A device for compacting earth, concretes, asphalt and similar plastic materials , substantially as hereinbefore described by way of example and irith reference to the accompanying drawings* For the Applicants PARTNERS ISiCB