US552514A

US552514A - Dental disk-holder

Info

Publication number: US552514A
Authority: US
Publication date: 1896-01-07
Anticipated expiration: 1913-01-07

Description

(No Model.)

' IM. GHIVERS. DENTAL DISK HOLDER.

I Patented Jan. 7, 1896.

NlTED STATES ROLAND M. CHIVERS, CF FALL RIVER, MASSACHUSETTS.

-DENTAL DISK-HOLDER.

SPECIFICATION forming part of Letters Patent No. 552,514, dated January 7, 1896.

Application filed June 8,1895, Serial No. 552,049. (No model.)

To aZZ whom, it may concern:

Be it known that I, ROLAND M. CHIVERs, a citizen of the United States, residing at Fall River, in the county of Bristol and State of Massachusetts, have invented certain new and useful Improvements in Disk-Holders for Dental Engines; and I do declare the follow- 'ing to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

My invention relates to dental tools, and its object is to provide a convenient and simple holder for the sandpaper disks used on the rotating mandrel of the engine.

Various devices have been proposed for this purpose. The ordinary mode of fastening is by a screw passing through the center of the disk into a tapped socket in the end of the mandrel. The disadvantage of this is that the screw is liable to be lost or misplaced when it is taken out to allow the worn disk to be re moved and a new one attached. In any event the manipulation of the screw or other means of fastening consumes considerable time, thereby interrupting the operation and increasing the discomfort of the patient.

My invention aims to permit the disk to be changed very quickly, and without the removal of any separate fastening device.

The invention consists of two or more clamps, inclosed in a sleeve which is mounted on the shank of the tool, and is movable axially to open the clamps, which are automatically closed by a spring in the sleeve, and engage with, a hole in the center of the disk.

I11 the drawings, Figure 1 is a side elevation of my disk-holder enlarged to about twice its natural size. Fig. '2 is a longitudinal section. Fig. 3 shows one of the disks, and Fig. 4 is an. end view of the sleeve.

The shank A is suitably formed at one end for attachment to the hand-piece of the engine, as usual in such implements. Inclosingthe other end of the shank is a sleeve 13, which has the internal rib I), having a sliding fit on the shank. The rear end of the sleeve fits over a collar reformed on said shank, and between the collar a and the rib b is a helical spring C encircling the shank. Thesleeve has a longitudinal slot b in which slides a lug a on the collar a to keep the parts in proper relation. The outer end 17 of the sleeve is closed, with the exception of two parallel slots b through each of which passes a curved fiat strip D loosely attached at its inner end to the end of the shank A, and having its outer end bent to form a hook (Z parallel with the closed end 12 of the sleeve. hen the sleeve is thrust outwardly by the sprin g, the hooks are brought tightly against the end of the sleeve. When the sleeve is forced back, compressing the spring, the hooks are brought together by reason of the divergence of the strips, as clearly shown in Fig. 2.

The sandpaper or other disks E are pro vided with a central square hole 0, just large enough to permit the hooks (Z to pass through when they are brought together. The sleeve is then released, and in its outward movement 1. A disk holder comprising a shank, a

sleeve sliding thereon, a spring acting to thrust the sleeve outwardly, and clamping hooks per-- manently attached to the end of the shank and adapted to coact with the end of the sleeve, substantially as described.

2. A disk holder, comprising a shank, a sleeve sliding thereon, and having a closed end containing two slots, a spring acting to thrust the sleeve outwardly, and clamping hooks permanently attached to the end of the shank, and passing through the slots in the sleeve, substantially as described.

3. A disk holder comprising a shank A having a collar a, a sleeve B fitting the collar and having an internal rib I) fitting the shank, and a closed end 19 containing slots b a spring C- inolosed between the collar and the rib, and brought together to pass through said hole, fiat, curved diverging strips D attached to the substantially as described. 10 end of the shank and passingthrough the slots In testimony whereof I affix my signature b and having hooks (Z parallel with the end in presence of two Witnesses.

5 of the sleeve, substantially as described. ROLAND M. CIIIVERS.

4:. The combination with a disk having a Vitnesses: square central hole, of a disk holder having ARBA N. LINCOLN, separable clamping hooks adapted when ANNEL L. ANELTT.