Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.


  1. Advanced Patent Search
Publication numberUS1694524 A
Publication typeGrant
Publication dateDec 11, 1928
Filing dateDec 29, 1926
Priority dateDec 31, 1925
Publication numberUS 1694524 A, US 1694524A, US-A-1694524, US1694524 A, US1694524A
InventorsKarl Zentner
Original AssigneeKarl Zentner
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Apparatus for kneading and forming amalgams
US 1694524 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

Dec. 11, 1928.




Application led December 29, 1926, Serial No. 157,854, and in Germany December 31, 1925.

The invention relates to an improved apparatus `for mixing and preparing amai-1 gams, more especially for use as dental fillings, and has for its object to provide a simple and effective mechanism, which will serve as a means for measuring the ingredients or constituents of the amalgam and also as a mortar in which the ingredients are worked and kneaded to the desired consistency and the excess mercury expelled, after which the body or pellet of amalgam is discharged ready for use. To thisend, the invention comprises a mortar consisting of an upper and lower section connected together ior independent rotation, each section being provided with a longitudinal bore traversed by a rod threaded on its lower end and engaging the threaded Vbore of the lower section and provided on its upper end with a piston-like head which iits the bore of the upper section and constitutes the bottom of the mortar as well as the element for discharging the finished body or pellet of amalgam ready for use.

The invention is illustrated in the accompanying drawings, in which Fig. l is a sectional elevation apparatus.v

Fig. 2 is a plan view thereof.

Fig. 3 is a side elevation of the stylus or pestle, which may be conveniently employed with the mortar. f

Referring to Fig. 1, the mortar comprises a base section al provided with a longitudinal bore, the lower part of which is interiorly screw threaded and the upper portion of which is enlarged to form a socket to receive the reduced cylindrical end of the upper member a, which latter is also provided with a longitudinal bore of two diameters in the upper and larger section of which operates a piston e formed upon a rod f traversing the smaller portion of the bore and provided at its lower'end with a screw threaded section g, which engages the threaded portion of the bore of the lower section a1.

The sections a and a1 are secured together to prevent relative longitudinal movement and to permit independent rotation of the sections by means of a set screw o tapped into an opening in the upper portion of the .section al, theend of the pin engaging a circumferential groove in the reduced portion b of the upper section a. By this particular coordination, it will be apparent that, if the parts a and a1, are turned in opposite directhrough the tions, the piston e will be displaced or moved up or down Within the cylindrical bore of the upper section a.

Associated with the mortar is a special form of pestle comprising a cylindrical body portion /t having a headed end e' adapted to knead the ingredients of the amalgam contained within the space Z above the piston e.- The opposite end of the pestle is provided With a cylindrical section k adapted to fit the bore above the piston and to serve as a means for compressing the amalgam to express the excess mercury and reduce the amalgam to the form of a cylindrical pellet.

In using the apparatus, the piston e is so 4adjusted in the upper portion of the section a, by rotating the sections a and csr with respect to each other, as to provide a space suiiicient to receive the necessary quantity of metal filings and mercury to make up the required amount of amalgam. This hollow space above the piston e is filled with the amalgam mass which is kneaded with the hea ded end z' of the pestle until the mass has acquired the proper plasticity or consistency. The mass is then compressed with the cylindrical end if: of the pestle to express any excess of mercury and reduce the mass of the amalgam to cylindrical form, which is then discharged from the hollow space by further rotating the parts a and al to raise the piston until the pellet of amalgam is discharged from the bore. By this relatively simple apparatus, the desired amount of amalgam may be quickly and accurately prepared without the operator being required to handle the ingredients and knead the mixture in his hands as has been customary, thereby avoiding the danger of irnpairing the health of the operator from mercurial poisoning.

Preferably the upper end of the section a is dished or concaved toward the bore to facilitate the charging of the metal filings and the mercury into the bore'.

What I cla-im is:

1. An apparatus for forming amalgams, comprising a container having a cylindrical bore and a? piston adjustably fixed within said bore to regulate the cubical content of the bore and serve as a means for discharging the finished amalgam from the bore.

2. An apparatus'for forming amalgams, comprising an upper section and a lower section connected for independent rotation and provided with aligning longitudinal bores, and a piston fitted in the bore of the upper section and having a stem in threaded engagement with the bore of the lower section, whereby relative rotation of the seetions will effect longitudinal adjustment of the piston within the bore of the upper section.

3. An apparatus for forming amalgams, comprising an upper member having a longitudinal bore, a lower member having a telescopio engagement with the upper member, means for locking the members together against longitudinal motion but permitting independent rotatory motion of the respective members, and a piston fitted in the bore of the upper member and having a rod provided with threads on its lower end engaging the threads in the bore of the lower member, wherebyv rotation of the upper and lower members in opposite directions will move the piston in the bore of the upper member toI regulate the cubieal capacity of the bore above the piston, and also to discharge the finished amalgam from the bore.

In testimony whereof I aix my signature.


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3506206 *Dec 8, 1967Apr 14, 1970Walter E Tweedie JrMortar for amalgam and the like
US5800169 *Jan 28, 1997Sep 1, 1998Muehlbauer; ErnstSupply and metering syringe for viscous dental compounds
EP0657143A1 *Nov 30, 1994Jun 14, 1995Ernst MühlbauerDosing syringe prefilled with dental compositions
U.S. Classification241/286, 241/199
International ClassificationA61C5/00, A61C5/06
Cooperative ClassificationA61C5/068
European ClassificationA61C5/06M