US723546A - Dental crown-holder. - Google Patents

Description

No. 723,646. PATENTED MAR. 24, 1903.

'J. W. PLACE. DENTAL GROWN HOLDER.

APPLICATION FILED MAR. 3, 1902.

N0 MODEL.

I v||| w v V I 1 x lll' a7 3 I 5 C a/ ii ll IHHHIITHHHZZJE UNITED STATES PATENT @FFICE .JOI IN' YVILDY PLACE, OF'TUOKA'HOE, NEW YORK.

DENTAL CROWN-HOLDER.

SPECIFICATION forming part of Letters Patent No. 723,546, dated March 24, 1903 Application filed March 3. 1902 Serial No. 96,372. (No model;)

To all whom it may concern.-

Be it knownthat I, JOHN WILDY PLACE, a citizen of the United States, residing at Tuckahoe, in the county of Westchester and State of New York, have invented a new and use- .ful Crown-Holder, of which the following is a specification.

My invention relates to improvements in a crown-holder in which three or more points impinge on the inside of a gold crown in such a way as to hold it firmly while being bufied' and polished; and the objects of my improve- .holder with the ments are, first, to providesuitable points for.

holding said crown, and, second, afford facilities for the proper adjustment of the points upon the inner surface of said crown, so as to make the crown-holder equally serviceable for all sizes and shapes of crowns. I attain these objects by the mechanism illustrated in the accompanying drawings, in which Figure 1 is a general view of the crownpoints in their normal position. Fig. 2 is a general View of the crownholder with the points depressed and the crown in position, but no pressure applied to the points. Fig. 3 is a general view (if the crown-holder with the points depressed, the crown in positio11,and sufficient tension placed upon the points by the piston being forced forward to hold the crown firmly. Fig. 4 is an interior View of the crown, showing the mannerin which the points impinge upon the inner surface of the crown.

In Fig.1, A represents a piston made of any suitable material, but preferably of wood, fashioned at one end into a handle and at the other end rounded, as at a, and the whole made to pass freely through the cylinder B.

.bent outward at the points, as at o.

13 represents a cylinder,of metaLpreferably' by two and one-half inches, 22 gage. b is a ferrule of same material, somewhat larger than B, and is for retaining the strips 0.

0 represents three or more strips of spring metal, preferably of steel or brass, of suitable size-say one-fourth inch by one and seven-eighths inches, 26 gagetapered and These strips are inserted between cylinder B and ferrule b and soldered, and being fiat prevent 5o lateralmotion. v

D represents a round-headed tack driven into the piston A near rounded end a and prevents the piston A when drawn back, as in Fig. 1, from dropping out.

' I am aware that prior to myinvention crown holders have been made with points which impinge on the inside of the crown. I therefore do not claim such a combination, broadly.

I claim as my invention The combination in a crown-holder of a cylinder, to one end of which are attached a plurality of metal strips by being inserted between said cylinder and a ferrule and all firmly soldered together, the outer ends of said strips being tapered and bent outwardly and a piston passing freely through the cylinder and between the metal strips all constructed and operating substantially as described.

JOHN WILDY PLACE.

Witnesses:

S. T. MANN, EDITH CONARD .BEAL.

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