Tool driving or impacting – Impacting devices – Hammer head driven by relatively moving motion transmitting...
Patent
1989-12-15
1992-02-18
Eley, Timothy V.
Tool driving or impacting
Impacting devices
Hammer head driven by relatively moving motion transmitting...
105232, 173 90, B23B 4516
Patent
active
050885677
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a ram device with a plurality of guides and a striking mass which is movable at the latter so as to be displaceable by a hydraulic cylinder.
Such a ram device is known from German Patent DE-PS 31 07 140. It comprises a cylinder-piston unit which is actuated by a pressure medium and which moves a striking mass along a guide, particularly a leader, the striking mass being guided on sliding pieces or rollers. The cylinder-piston unit which is actuated by a pressure medium is arranged centrally between two guides. In order to reduce the overall length, the striking body also includes a central pocket-like recess for receiving the cylinder-piston unit. During the upward movement of the striking mass, which is hung on the cylinder-piston unit, the latter dips into the recess.
In order to prevent sound emissions, the entire piston-cylinder unit with striking body and guides is arranged inside a closed housing.
The central recess provided in the striking body for receiving the cylinder-piston unit results in a disadvantageous reduction of the striking body weight. The advantageous short overall length is achieved at the expense of reduced striking energy. Moreover, the total weight of the system and the manufacturing cost are disadvantageously increased by means of the outer steel jacket provided for the reduction of sound emission.
SUMMARY OF THE INVENTION
It is the object of the invention to provide a ram device which can deliver high striking energy in spite of a structure which is as short as possible, wherein the sound emissions are to be reduced.
In keeping with this object and others which will become apparent hereinafter, the hydraulic cylinder is arranged with its longitudinal axis outside the path of the center of gravity of the striking mass.
The arrangement of the hydraulic cylinder outside the center of the striking mass enables the use of striking masses whose weight is not reduced by means of cut out portions for the penetration by the cylinder. Since the piston rod of the hydraulic cylinder acts at the lower end of the striking mass and the cylinder-piston unit is arranged next to the striking mass, advantageously short overall lengths result for the ram device according to the invention.
Previously, it was customary to let the drive for the striking masses act centrically so that the guide forces are as low as possible. Surprisingly, it has been shown that the sound emission is reduced by means of the eccentric arrangement of the hydraulic cylinder. This effect is explained in that the eccentric arrangement leads to a defined contact of the striking mass at the guides and undefined forces accordingly no longer occur in the guides.
However, the necessary clearance within the guides and the uncontrolled striking of the guided striking mass at the guides are blamed in retrospect for part of the sound emissions.
An advantageous structure results when three guides are provided for guiding the striking mass, which guides are parallel to its movement path. The guide forces remain controllable in spite of the eccentric arrangement of the hydraulic cylinder. They are further reduced in an advantageous manner if the striking mass is guided in its respective end areas.
The arrangement of a guide on the side of the striking mass opposite the hydraulic cylinder has proven particularly favorable.
If the hydraulic cylinder and/or the guides are arranged outside the striking mass, the maintenance for the system is substantially reduced.
The guide forces can be further reduced in an advantageous manner if the axes of the guides arranged at the side of the plane of symmetry lie in planes which form an angle of 120.degree. or less relative to one another.
The step by which the axis of the hydraulic cylinder is arranged within an imaginary prism connected the guide axes has the same effect.
An advantageously uniform loading of the material to be driven in results when the striking mass is not constructed so as to be radially symmetrical, but is constructed so a
REFERENCES:
patent: 3474870 (1969-10-01), Cook
patent: 4544040 (1985-10-01), Sweeney
Kuhn Hans
Rusen Jochen
Schnell Hans
Eley Timothy V.
Fridie, Jr. William
Menck GmbH
Striker Michael J.
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