Boring or penetrating the earth – Tool removable or insertable through or around driving or... – Laterally shiftable cutter element movable through shaft
Patent
1992-03-17
1993-01-26
Bagnell, David J.
Boring or penetrating the earth
Tool removable or insertable through or around driving or...
Laterally shiftable cutter element movable through shaft
175263, 299 86, E21B 1010
Patent
active
051815770
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a device for fixing a disk cutter to the cutter head of a shield excavator for excavating a working face.
BACKGROUND TECHNOLOGY
A conventional shield excavator for excavating a tunnel has the cutter head which is disposed at the front portion of a shield body and rotatably driven by a cutter motor in which the cutter head has plural disk cutters which are rotatably provided at the front surface of the cutter head. When the cutter head is rotatably driven, these disk cutters excavate the working face.
The conventional disk cutter is, e. g. disclosed in Japanese Laid-Open Patent Publication No. 58-18497 in which a rotary cutter is fixed to a fixing seat in the steps of inserting a shaft supporter through an insertion groove defined on the fixing seat into a U-shaped notched portion of a rotary disk, inserting a spacer at the rear portion of the shaft supporter, turning a rotary portion 180.degree., attaching a presser member and fixing the presser member to the fixing seat by bolts.
In the conventional disk cutter, there was such a problem that the fixing portion has been large scaled since the height of the fixing seat should be increased in order to increase the strength of the fixing seat because of the insertion grooves in the fixing seat.
There was another problem that the structure is complex since many parts are necessitated for fixing the rotary cutter to the fixing seat and the rotary cutter drops when wheels are loosened by a load applied thereto in a rotary direction, thereby deteriorating its working efficiency or preventing the shied excavator from excavating further.
The present invention has been made to improve the problems of the conventional disk cutter and to provide a device for fixing the disk cutter to the shield excavator, which is simple in structure and reduced in the height in the fixing portion so as to be capable of fixing many disk cutters to the cutter head.
DISCLOSURE OF THE INVENTION
The present invention comprises a plurality of cylindrical cases provided on a face plate of a cutter head which is rotatably disposed on the front part of a shield proper, bosses disposed to project face-to-face in each of these cases, retainers having U-shaped grooves therein and provided at both ends of a shaft rotatably supporting a cutter proper, the U-shaped grooves being fitted onto the bosses, a key block fixed to the open side of the U-shaped groove which is formed on the retainer wherein the cutter proper can be fixed to the case with the boss clamped by the key block and the retainer.
Accordingly, the cutter proper can be fixed to the case without forming insertion grooves in the case for thereby reducing the height of the case, so that more pieces of cutters can be fixed to the cutter head, and it is possible to provide a fixing device having a simplified structure and capable of being mounted easily, reducing a load applied to a fixing bolt and being excellent in the strength thereof.
BRIEF DESCRIPTION OF THE DRAWINGS
The drawings show a device for fixing disk cutter to tunnel excavator according to an embodiment of the present invention in which FIG. 1 is a cross-sectional view showing an assembled fixing device, FIG. 2 is a front view of a case and FIGS. 3 to 8 are views showing steps of assembling a cutter proper.
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to the drawings.
In the figures, denoted at 1 is a cutter head rotatably disposed on the front part of a shield proper (not shown) and a plurality of cases 2 are provided on a face plate la of the cutter head.
The case 2 is cylindrical and has flat portions 2a which are confronted to each other. Cylindrical bosses 3 protrude from the inner surfaces of the flat portions 2a and have U-shaped grooves 3a having openings at the cutter insertion side. U-shaped grooves 4a formed on a retainer 4 are fitted on the bosses 3.
A cutter proper 5 comprises a hub 5a and a cutter ring 5b fitted on a periphery of the
REFERENCES:
patent: 3787101 (1974-01-01), Sugden
patent: 3791705 (1974-02-01), Schimel
patent: 4784438 (1988-11-01), Fikse
Minami Yoshihito
Tsukamoto Toshio
Bagnell David J.
Kabushiki Kaisha Komatsu Seisakusho
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