Cutlery – Combined cutlery or combined with ancillary feature – With material-holder or disposal
Reexamination Certificate
2000-03-23
2001-10-09
Watts, Douglas D. (Department: 3724)
Cutlery
Combined cutlery or combined with ancillary feature
With material-holder or disposal
C241S101730
Reexamination Certificate
active
06298560
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a shear assembly, and more particularly, to a shear assembly detachably attached to a boom of an excavator.
2. Description of the Related Art
A shear assembly has been detachably attached to a boom of an excavator or a mobile vehicle for cutting off a workpiece. Typically, during attaching the shear assembly to the boom, complicated mechanisms of the shearing assembly should be connected to the other mechanism of the boom in order to operate at least two jaws mounted on the shear assembly. Due to these complicated mechanisms connected between the shear assembly and the boom, the shear assembly can not be easily attached to the mechanism of the boom, and it is very difficult for a user to detach the shear assembly from the boom. Therefore, I have noticed that these complicated shear assemblies can not be easily attached to the boom.
Moreover, the complicated connections between the shear assembly and the boom of the excavating device can be easily damaged and broken while using the shear assembly. The shear assembly should be replaced when any one of the connecting mechanisms between the shear assembly and the boom of the excavating device is damaged. In this instance, the user has to dissemble several complicated mechanisms connected between the shear assembly and the boom and attach all of these mechanism of a new shear assembly to the boom of the excavator. It is very dangerous for the user to detach the damaged shear assembly and attach the replacement to the boom of the excavator because it is too heavy for the user to manually move and connect the devices. Moreover, the assembly may be damaged or the user injured during changing and replacing these devices and connecting the complicated mechanisms.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a shear assembly suitable to be easily attached to a boom of an excavating device or a mobile vehicle.
It is another object to provide a shear assembly able to prevent the mechanism of the shear assembly from being damaged during the operation of the shear assembly.
It is still another object to provide a shear assembly able to provide a compact and convenient mechanism of the shear assembly attached to the boom of the excavating device.
It is still yet another object to provide a shear assembly amenable to easy assembly and disassembly.
It is further object to provide a shear assembly able to operate without complicated connection mechanisms between the boom and the shearing assembly.
It is another further object to provide a shear assembly able to provide a durable connection between a cylinder and an external fluid source and between the rotatable mechanism and stationary mechanism of the shear assembly.
These and other objects may be achieved by using a shear assembly attached to an excavator or a mobile vehicle. The shear assembly includes a bracket unit detachably attached to the excavator, a main body rotatably attached to the bracket unit, a rotating unit disposed between the main body and the bracket unit to rotate the main body around the bracket unit, a fixed arm unit connected to the main body, a moving arm unit rotatably mounted on the main unit and opened from and closed toward the fixed arm unit, and a cylinder unit rotatably mounted on the main body, and rotating the moving arm unit.
A plurality of boom holes formed on each bracket of the bracket unit are coupled to a rigid boom of the excavator or a mobile vehicle so as to securely mount the shear assembly on either the excavator or a mobile vehicle. A motor, such as a hydraulic motor or electric motor, mounted on a turntable of the rotating unit rotates the main body. A pinion formed on a shaft coupled to the motor is meshed with gear teeth formed on the inside of a swing gear fixed to a connecting plate of the main body. A swing gear guide is fixed to the turntable, and a connecting plate of the main body connected to the motor is disposed within the swing gear guide to rotate around the bracket unit when driven by the motor.
A center joint unit used for providing passageways of the fluid material supplied from outside of the shear assembly to the cylinder includes a fixed coupler attached to the turntable and rotatably inserted into a hole formed on an central portion of the connecting plate of main body and a movable coupler rotatably inserted into a central hollow formed on a central portion of fixed coupler. A plurality of conduits formed on the fixed coupler and the moving coupler are coupled to each other in order to form the passageway while the movable coupler rotates relative to the bracket, the main body, and the fixed coupler. A protrusion formed on a stop ring fixed to the connecting plate of the main body is inserted into a recess formed on the movable coupler of the centerjoint thereby, guiding the movable coupler while the center joint moves relative to the main body and the bracket.
A pair of supports of the main body extend from the connecting plate. The fixed arm unit is disposed between and fixed to the supports by pins. The moving arm unit is rotatably coupled to the support by a fixing pin and rotates about an axis passing through a center of the fixing pin.
The cylinder unit is rotatably mounted on support by a cylinder pin and rotates about an axis passing though a center of the cylinder pin. A center joint unit is disposed on the rotating unit to supply a fluid material to the cylinder through holes formed on a center area of the turntable and the connecting plate. A fixed coupler having a plurality of fluid conduits is attached to the turntable. A rotatable coupler is disposed on a cylindrical hollow formed on the fixed coupler to receive the fluid material from the fluid conduit through circular conduits, a redial conduit, and longitudinal conduits formed on the rotatable coupler. A plurality of stoppers attached to the connecting plate support and guide the rotatable coupler. A plurality of protrusions formed on the stoppers are inserted into formed on the fixed coupler. A plurality of hoses are coupled between the longitudinal conduits of the rotatable coupler and fluid couplers of the cylinder.
The moving arm body of the moving arm unit is connected to the cylinder unit by a moving pin. An upper blade is located in a lower blade recess. Screws attach the upper blade to an upper jaw of the moving arm unit while a lower blade is attached to a lower jaw of the fixed arm unit by screws. Screws couple a guide blade inserted into a guide recess to the lower jaw. An end recess is formed on the lower jaw to guide an end of the upper jaw when the upper jaw is inserted into an lower recess.
REFERENCES:
patent: 4961543 (1990-10-01), Sakato et al.
patent: 5894666 (1999-04-01), Hrusch
Bushnell , Esq. Robert E.
Daemo Engineering Co., Ltd.
Watts Douglas D.
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