Guarding structure for a mixer of molding material

A guarding structure for a mixer of molding material that has a shock absorbing chassis containing a detention board and a mixer body held in the shock absorbing chassis and run through the detention board includes an anchor member between the mixer body and the detention board. The anchor member is fastened to the detention board to form a tight coupling with the mixer body so that the mixer body is held firmly in the detention board.

FIELD OF THE INVENTION

The present invention relates to a guarding structure and particularly to a guarding structure for a mixer of molding material.

BACKGROUND OF THE INVENTION

In dentistry making of a denture has to first forming a master mold according to the teeth profile of a patient, then forming the denture through the master mold. The material of the master mold generally is formed by mixing molding powder or gypsum with water. Mixing is done by hands to make the material evenly blended and viscous. The mixed material will be cured after a period of time. As mixing by hands takes a lot of labor and cannot last a very long time, and the material cannot be blended evenly, the material often has air bubbles inside and results in a porous and coarse surface on the finished mold. This affects the quality of the denture.

To remedy the aforesaid problem, mixers for dental molding material have been developed in prior art (one of such references is R.O.C. patent publication No. 274741). It includes a transmission apparatus with a planetary gear mechanism. The molding material is mixed by rotation and also by revolution about a sun gear so that it can be evenly blended at high speed rotation and receive centrifugal force to eliminate the air bubbles.

The mixer previously discussed has extensible springs to link the top of a motor with a seat. During operation the bottom of the motor is not being anchored and tends to sway excessively. As a result the motor and equipment mounted thereon are not being held steadily. To overcome this problem, Applicant has proposed a shock absorbing structure for mixers of dental molding material (R.O.C. patent No. M278472). It includes a plurality of bracing struts, a plurality of first extensible springs, a plurality of second extensible springs, a bottom board and a detention board. The first extensible springs bridge the top end of the corresponding adjacent bracing struts and the top of a motor. The second extensible springs bridge the bottom end of the adjacent bracing struts and the bottom of the motor. The bottom board is anchored on the bottom end of the bracing struts. The detention board has a central opening. The bracing struts run through the detention board and anchored on the middle portion of the bracing struts. The motor is confined in the central opening through the constraint of the extensible springs and suspended above the bottom board. Through the first and second extensible springs that are fastened to the top and bottom of the motor, the vibration generated by the motor during operation can be absorbed to enhance the steadiness of the motor and the equipment mounted thereon.

During transportation, to prevent the mixer from being swayed and impacted in the shock absorbing structure, a plurality of screws are used to tightly fasten the bottom of the mixer to the bottom board of the shock absorbing structure. But there is still a gap between the central opening and the mixer, friction or impact between the mixer body and the detention board frequently occurs during transportation. This could result in denting, fracturing or damaging of the mixer and the detention board. There is still room for improvement.

SUMMARY OF THE INVENTION

The primary object of the present invention is to provide an anchor member to prevent friction or impact between a mixer body and a detention board during transportation.

To achieve the foregoing object, the invention provides a guarding mechanism for a mixer of molding material. The mixer includes a shock absorbing chassis which has a detention board and a mixer body held in the shock absorbing chassis and run through the detention board. The invention has the following features: an anchor member is provided between the mixer body and the detention board and fastened to the detention board to form a tight coupling with the mixer body. Therefore the mixer body is held firmly in the detention board.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Please refer toFIGS. 1,2and3for an embodiment of the guarding structure for a mixer of molding material of the invention. The mixer includes a shock absorbing chassis1and a mixer body2held in the shock absorbing chassis1.

The shock absorbing chassis1has a bottom board10to hold the mixer body2and a detention board12. The detention board12has a central round opening120to hold the mixer body2. The shock absorbing chassis1is coupled with the mixer body2through a plurality of springs14which are compressible to alleviate vibration of the mixer body2during operation.

The mixer body2has a cylindrical portion20surrounded by a plurality of fastening struts22.

The guarding structure of the invention includes the following features:

An anchor member3is provided between the mixer body2and the detention board12. The anchor member3is fastened to the detention board12to form a tight coupling with the mixer body2so that the mixed body2is held firmly in the detention board12. The anchor member3has an arched portion34corresponding to the cylindrical portion20to form a close coupling with the mixer body2. The arched portion34further has notches340corresponding to and holding the fastening struts22. In this embodiment the anchor member3is fastened to the detention board12by screwing a plurality of screws36in screw holes122formed on the detention board12. The anchor member3also has a plurality of anchor elements30and32surrounding the central round opening120to firmly clamp and anchor the mixer body2in the central round opening120. Therefore shaking occurred during transportation of the mixer does not generate friction or impact between the mixer body2and the detention board12.

In short, the invention provides the anchor member3fastened to the detention board12to firmly hold the mixer body2in the central round opening120to prevent friction or impact caused by shaking during transportation of the mixer of the molding material. It offers a significant improvement over the conventional techniques.