Solid material comminution or disintegration – Apparatus – With overload release means
Reexamination Certificate
2000-05-15
2001-12-04
Rosenbaum, Mark (Department: 3725)
Solid material comminution or disintegration
Apparatus
With overload release means
C241S101200, C241S236000
Reexamination Certificate
active
06325309
ABSTRACT:
SUMMARY OF INVENTION
This invention is related to a gear protection device of a paper shredder. The gearbox of the paper shredder is provided with a transmission component having a safety trip and with an adjustable transmission load. The device is provided on an end face of a primary gear driven by an output shaft of a motor, which end face is provided with a radial teethed face that couples to an end face of a secondary gear being provided with another radial teethed face. The primary and second gears are serially connected on a central shaft. Another end of the secondary gear is formed with a male gear engaging and being driven by another gear mechanism. Another end of the primary gear is provided with an adjustable transmission load structure that comprises a compression spring, a bearing, and a screw for adjusting to an appropriate force between the primary and second gears, whereby when the transmission load being subjected to the secondary gear is greater than such a force, retreating of the spring after compression causes the primary and secondary gears to trip away from each other such that the friction only extends to the radial awl teethed faces so as to effectively protect the motor as well as other gearboxes.
Paper shredders are used to prevent leakage of printed information such that confidential information can be diminished along with the paper after passing through the paper shredders. Conventional paper shredders each include a motor that drives a rolling blade through a gearbox such that the blade edge (in a tined or serrated form) grips the paper and then shreds the paper into strips or fragments.
During the entire shredding process, the resistance caused by the shredded paper may be fed-back to the gearbox and, thus, damage the tiny gears within the gearbox under the continuous power output of the motor and eventually due to overwhelming torque. The entire transmission system will then become malfunctioned due to a single damaged gear.
One cause for damaging the gears may be that a user inserts more paper than the paper shredder can handle at a time thereby overloading the roller blade. Though such a type of damage resulting from improper uses cannot be imputed to the paper shredders, the manufacturer of the paper shredders should be obligated to design the paper shredders that can prevent damages resulting from such improper uses so as to prolong the life cycle and to enhance the quality of the paper shredders.
In view of the above, the “gear protection device of a paper shredder” of this invention is invented in an attempt to solve the above problems after diligent trials and researches.
It is thus a primary object of this invention to provide a gear protection device of a paper shredder that includes a clutching component made of abrasion-resistant materials. The device is automatically tripped when encountering overwhelming feedback resistance caused by the shredded paper, such that the entire gearbox and blade assembly can be temporarily free from the driving force of the motor when the motor is still in operation so as to prevent from damaging the gears and the blade due to overloading. In addition, the electric motor can be prevented from burning out due to overloading or elevating voltage.
In order to clearly delineate the objects, characteristics and advantages of the present invention, a few preferred embodiments are specifically explained in detail in accompany with the drawings as follows.
REFERENCES:
patent: 4560110 (1985-12-01), Burda
patent: 5518190 (1996-05-01), Aebi et al.
patent: 3545314 (1987-07-01), None
Dougherty & Troxell
Rosenbaum Mark
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