Direct driven type shock ripper device

Details Direct driven type shock ripper device Direct driven type shock ripper device

1990-07-25

1992-03-10

Taylor, Dennis L.

Excavating

Peat excavators

37195, 37DIG1, 371175, 37 98, 1722605, E02F 502

Patent

active

050940171

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to a parallel linkage type shock ripper device, and more particularly, to a direct driven shock ripper device which enables blows of a hydraulic breaker to be efficiently transferred to a base rock.


BACKGROUND ART

Conventionally, when base rocks are to be dug (ripping operation) by a construction machine such as a bulldozer, a parallel link type shock ripper device 1 is mounted on a rear 2 of the vehicle, as shown in FIG. 7. A shank 8 is forced into the base rock by the depressing force generated by the weight of the bulldozer. The base rock is broken up by utilizing the towing force of the bulldozer and the hydraulic force of a tilt cylinder 5. The ability with which the bulldozer breaks up the base rock is substantially proportional to the weight of the vehicle. Thus, the hardness of the base rocks at the operation site is investigated beforehand, and a vehicle which suits the operation condition is selected.
When hard rocks that cannot be broken up by such an operation exist, they are cracked by utilizing the blows of a hydraulic breaker 10 mounted on the ripper device 1 to facilitate breaking (as is disclosed in Japanese Utility Model Laid-Open No. 35068/1987). The blows F given by the hydraulic breaker 10 are transferred from an impact receiving surface 8b of the shank 8 to the base rock through a ripper point 17 provided at one end of the shank 8, as shown in FIG. 8. However, since a shank rotating shaft 8a provided at the other end of the shank 8 is pivotally supported on an arm 6, the ripper point 17 revolves in the form of an arc around the shank rotating shaft 8a. In consequence, the blow F exerted on the base rock is reduced, and the function of the hydraulic breaker 10 cannot be fully utilized. As a result, the base rock cannot be broken regularly, and the vehicle jolts considerably when it travels in reverse, providing an uncomfortable ride. Furthermore, since the ripper point 17 cannot be forced very far into the rock, the ripper point 17 slips often, increasing wear of the ripper point. Also, the tracked vehicles slip often, increasing wear or damage thereof.
In view of the aforementioned problem, an object of the present invention is to provide a direct driven shock ripper device which is capable of efficiently transferring blows of a hydraulic breaker to a base rock.


SUMMARY OF INVENTION

To this end, the present invention provides a direct driven type shock ripper device which includes a bracket which can be affixed to the rear of a construction machine vehicle, a beam on which a shank and a hydraulic breaker, which gives impacts to the shank, are mounted, the beam being disposed to the back of the bracket; an arm which interconnects a lower portion of the bracket to a lower portion of the beam; a tilt cylinder which interconnects an upper portion of the bracket to an upper portion of the beam; the bracket, the beam, the arm and the tilt cylinder in combination forming a parallel linkage; and a lift cylinder provided between an upper portion of the bracket and a lower portion of the beam. The shank is mounted on the beam through a pair of link members to form a quadric linkage. In consequence, blows of the hydraulic breaker can be efficiently transferred to a base rock in the form of a linear motion of the shank. This facilitates breaking or cracking of the base rock and improves the ripping operability.


BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a side elevational view of an embodiment of a direct operated shock ripper device according to the present invention;
FIG. 2 is a cross-sectional view showing a state in which a ripper shank is mounted on a beam;
FIG. 3 is a section taken along the line 3--3 of FIG. 1;
FIG. 4 is a section taken along the line 4--4 of FIG. 1;
FIGS. 5 and 6 are respectively sections taken along the lines 5--5 and 6--6 of FIG. 1;
FIG. 7 is a side view of a bulldozer with a conventional shock ripper device; and
FIG. 8 illustrates the conventional shock ripper device.


BEST MODE FOR CARRYING OUT THE INVENTION

FIG.

REFERENCES:
patent: 2348796 (1944-05-01), Ferwerda et al.
patent: 2982034 (1961-05-01), Perry et al.
patent: 3539018 (1970-11-01), Sprenkel
patent: 4031964 (1977-06-01), Takahashi et al.
patent: 4229046 (1980-10-01), Gurries
patent: 4240216 (1980-12-01), Martel
patent: 4249614 (1981-02-01), van der Lely
patent: 4277899 (1981-07-01), Guthoff
patent: 4453772 (1984-06-01), Roussin
patent: 4625438 (1986-12-01), Mozer
patent: 4834461 (1989-05-01), Fidler et al.

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