Tool driving or impacting – With means to adjust position of axis of tool advance – Plural adjustments
Patent
1990-01-26
1992-05-12
Yost, Frank T.
Tool driving or impacting
With means to adjust position of axis of tool advance
Plural adjustments
173185, E21C 1100, B25D 1728
Patent
active
051118882
DESCRIPTION:
BRIEF SUMMARY
The invention refers to a mounting for a swingable suspension of a cutter hammer to a boom or the like which is tiltable about a horizontal axis, with the cutter hammer being floatingly suspended and swingable transversely to the tilting plane about an axis which extends in the tilting plane of the boom.
Conventional cutter hammers which are non-swingably mounted to the boom did not permit to dig an excavation of rectangular cross section because the lowering of the cutter hammer in a vertical plane allows to dig excavations of only trapezoid cross section due to the width of the cutter hammer unit which laterally exceeds to a considerable degree the actual cutter tool so that a rectilinear or vertical cutting of the ditch wall is not possible.
It was thus proposed in designs of the above-mentioned type to swingably mount the cutter hammer to the boom transversely to the tilting plane of the boom, with a hydraulic piston/cylinder unit performing the slanting and locking of the cutter hammer in this known design. However, these designs did not find practical application because the hydraulic piston/cylinder unit, which causes the swinging and locking of the cutter hammer, had to receive the blows exerted by the cutter hammer upon the subsoil in order to avoid a lateral deflection of the cutter hammer. These known designs were thus unsuitable for practical use.
The invention is based on the object to provide a mounting of the above-mentioned type such that it is completely suitable for practical application. This object is attained in accordance with the present invention by locking the cutter hammer in the desired swinging position relative to the boom through a form-fitting coupling. Thus, the enormous cutting forces are received by a form-fitting coupling, and by virtue of the form-fit, the deflection of the coupling is kept as low as possible. Such designs according to the invention are thus also suitable for suspension of heavy cutter hammers.
Advantageously, the form-fitting coupling can be achieved by a bolt which is received in aligned bores to thereby attain that the coupling can receive high forces since the bolts can be very accurately designed with regard to the bores. The bolt may be shiftable in axial direction by means of a hydraulic piston/cylinder unit so as to allow an automatic disengaging and engaging of the coupling. For receiving the bolt, the part supporting the piston/cylinder unit may be provided with guide bores within eyelets while the locking bores may be arranged in a swivel plate of the other part. Thus, a secure locking of the cutter hammer relative to the boom is obtained. The locking bores in the swivel plate may be arranged along a circular arc, with the center thereof lying on the axis of the swivel axis. Finally, the swivel plate may engage between the eyelets, with the free distance between the eyelets corresponding approximately to the width of the swivel plate so that the bolt is subjected only slightly to bending strain and primarily to shearing strain .
An exemplified embodiment of the subject matter of the invention is illustrated in the drawing.
FIG. 1 schematically shows a ditch excavation with a conventionally suspended cutter hammer.
FIG. 2 schematically depicts the ditch excavation with a cutter hammer suspended in accordance with the present invention.
FIG. 3 is a detailed illustration of the swinging unit.
FIG. 4 shows a side view in direction of arrow P in FIG. 3.
FIG. 1 shows the cutter hammer 2 articulated to the boom 1 in conventional manner which allows a change in the swinging position of the cutter hammer only in direction of the tilting movement upon tilting of the boom 1 but not transversely to the tilting plane. As can be seen from FIG. 1, the ditch has a trapezoid cross section, resulting in an increased rise of material to be removed. Furthermore, a larger amount of exchange material must be returned when filling the ditch.
FIG. 2 shows the connection of the cutter hammer 2 with the boom via a swinging device 3 which is mounted in a quick change at
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patent: 1477749 (1923-12-01), Dobson
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patent: 3596997 (1971-08-01), Valantis
patent: 3889762 (1975-06-01), Sumner
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patent: 4199033 (1980-04-01), Van Gundy, Jr.
patent: 4311347 (1982-01-01), Cobb
patent: 4684360 (1987-08-01), Tokuno et al.
Smith Scott A.
Yost Frank T.
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