Tool driving or impacting – With means to adjust position of axis of tool advance – Plural adjustments
Patent
1998-03-02
2000-06-20
Vo, Peter
Tool driving or impacting
With means to adjust position of axis of tool advance
Plural adjustments
173 29, 173 37, 173185, 173193, E21C 1100
Patent
active
060766158
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
Present invention relates to a multi-linked working boom for a working machine, where the boom carries at the outer end a hydraulically manoeuvrable working tool, especially rock drilling equipment, and comprises a first pair of hydraulically manoeuvrable link arms, which are connected to the working machine, and a second pair of hydraulically manoeuvrable link arms, which connect the working tool to the first pair of link arms.
An arrangement of the afore-mentioned kind is shown in SE-B 449 882. There is shown a working tool in the form of a timber grab, where a bunch of timber logs are to be moved in one and the same direction from the collection location to the delivery location by movement of link arms of a working boom in one and the same vertical plane. In addition the working boom can be swung about an extra vertical axis of the working machine. The power means for swinging the working arms is operated with hydraulic oil supplied from the hydraulic system of the working machine. The working boom is shown in the form of a first and a second pair of link arms which serve to increase longitudinally the working area of the working boom via a series of successive link arms. The four link arms illustrated are pivotally mounted about their mutually parallel pivot axes by means of their respective hydraulic pressure cylinders. The working boom is adapted to be able to be supported against the ground by means of a support plate on the under side of the third link arm, reckoned from the working machine, in order thereby to unload via the outer link arms during an introductory timber transport phase portions of the load from the working boom to the ground. In this connection a support plate is arranged on the under side of the middle link of the loading boom. The support plate has however an exclusive function during said introductory transport phase.
Similar working booms are also shown in EP-A1-0 299 104 and in DE-C1 41 32 173 in connection with hydraulically swingable loading shovels, where the working booms are swung in a manner corresponding to the timber grab.
SUMMARY OF THE INVENTION
With the present invention the aim is to provide an arrangement of the afore-mentioned kind which is specifically designed for use in rock drilling operations, where the approach to the problem is different from the pure load grabbing operations. By the fact that the working area is different in rock drilling operations and thereby creates a need for other functions for the working boom than that which can be offered by the known load grabbing operations, the aim according to the invention is to design the working boom in a special, novel way according to the invention. However the objective is a working boom which can also be employed for other working tools than drilling equipment, for example for bolt recovery tools, excavation tools, etc., where the tool requires corresponding working areas and corresponding working conditions as with rock drilling equipment, in order to carry out several successive working operations within a specific working area.
In practice it is in many instances problematical in rock drilling operations, and in similar floor space-demanding working operations, to get suitable access to the working location and often there must be constructed in advance temporary access roads for the working machine. In particular the aim according to the invention is to be able to establish with the aid of the working boom a remotely disposed base for performing a series of working operations within a specific space-limited working area.
According to the invention the afore-mentioned approach to the problem is solved in that the second pair of link arms is joint connected to the first pair of link arms via a link arm-forming support member, that the support member is provided with a stop part or a set of stop parts for intermittently fixing the support member against an arbitrary support base by means of a tension force from the first pair of link arms, and that the second pair of l
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Dalland Knut
Osen Ingvar
Calve Jim
Vo Peter
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