US601395A

US601395A - John w

Info

Publication number: US601395A
Authority: US
Publication date: 1898-03-29
Anticipated expiration: 1915-03-29

Description

(No Model.)

J. W. GILBERT. DENTAL ENGINE HANDPIBOB.

Patented Mar. 29, 1898.

/VE TOR WITNESSES:

mi: Non'ms PETERS co.. Pnoauwa., wAsremuYoN. n. c.

UNrrnn STATES Arnr Finca.

JOI-IN W. GILBERT, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE S. S. WHITE DENTAL MANUFACTURING COMPANY, OF SAME PLACE.

DENTAL-ENGINEWHANDPIECE.

SPECIFICATION forming part of Letters Patent No. 601,395,vdated March 29, 1898.

Application iiled October 2,1897.

To all whom, t may con/cern:

Beit known that I, JOHN W. GILBERT, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented a certain new and useful Improvement in Dental- Engine Handpieces; and I do hereby declare the following 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.

My invention relates to a certain improvenient, as hereinafter claimed, in dental-en gine handpieces of the class known as chuckhandpieces; and my object chiefly is to improve that type of this class of haudpieces shown in Letters Patent of the United States' No. 291,571, dated January S, 1884.

In the accompanying drawings, Figure l is a viewin elevation of a hand piece with myimprovement applied thereto. Fig. 2 is a longitudinal central section, on an enlarged scale, of the handpiece shown in Fig. 1. Fig. 3 is a cross-section on the line 3 3 of Fig. 2. Fig. i is a View in elevation of the front reduced tubular portion of the telescopic section of the handpiece detached. Fig. 5 is a perspective view of the adjustable bearing or chuck for clamping the movable sections of the handpiece together, and Fig. 6 is an end view of the nut or collar for operating said adjustable bearing or chuck.

The handpiece'shown in the patent above referred to and to which my improvement is shown as applied consists, essentially, of a handle-section A and a telescopic or sliding section C, having telescoping or sliding connection with the handle-section by wayof a tubular union-piece B, detachably connected with the handle-section, the front reduced tubular portion C of the telescopic section being adapted to slide in the tubular unionpiece. A tubular spindle D is fitted to turn in the handle-section A, and a tubular split endwise-movable tool-holding chuck E is fitted within the front end of the tubular spindle. Apivoted lever F is also mounted in the tubular spindle and bears upon a headed Y pin f, which enters and bears upon a section F of the chuck. VMovable endwise with and turning independently of the telescopic sec- Serial No. 653,804. (No model.)

tion O is a driving-shaft G, provided with a serrated wedge or inclined surface g on its forward end, which enters and is adapted to slide in the tubular spindle and bear upon the long arm of the lever F.

Vithout further description of the construction of the handpiece the operation will readily be understood. YWhen the telescopic section is pulled rearwardly the driving-shaft G is also moved rearwardly and the wedge thereon rocks the lever F and forces the toollocking chuck forward, thus compressing its jaws and locking the shank of a tool .I inserted therein. Upon pushing the handle andtelescopic sections together the pressure on the chuck is relieved and the tool released.

The sliding or telescopic connection between the handle-section and the telescopic section after long use of the handpiece sometimes wears and permits of an undesirable looseness of the parts. In order to overcome thisobjection, I have provided means for inaking a tight connection between the handlesection and the telescopic section, or, in other words, I have provided an adjustable bearing or chuck for the sliding connection between the two sections ofthe handpiece. To

this end the bore of the-union-piece of the handle-section is enlarged for a portion of its length, so as to provide a seat for an adjustable-bearing, shown in this instance as consistin g of a split chuck I-I. This chuck, which is tubular and surrounds the front reduced portion of the telescopic section, is beveled on its opposite ends. One of these beveled ends bears against the correspondingly-beveled lower end of a seat in the union-piece, while the opposite beveled end is adapted to be borne upon by an interiorly-threaded collar or nut I, screwing upon the eXteriorlythreaded endy of the union-piece. The collar or nut I is provided with a spline or feather t', adapted to engage a longitudinal groove c in the telescopic section, so that said section may slide freely through the collar or nut andv the section and nut be turned together. By this means the collar or nut may be turned in opposite directions by the turning of the telescopic section of the handpiece and caused to screw backward or forward upon the unionpiece, according to the direction in which it roo is turned. When the nut is turned in one directionsay to the right-it forces the chuck forward and caus'esits opposite split ends to bear upon and grip the telescopic section, whereby any looseness between the sliding sections of thc handpiece may be taken up and the telescopic sectionv locked in order to prevent its being accidentally pushed for# Ward relatively to the handle-section.

The operation of my improved handpiece is as follows: When the handpiece is adjusted, as shown in Fig. 2,with the sections pushed together, the shank of a tool, as J, may be inserted in the toolholding chuck E and firmly clamped therein by pulling the telescopic section rearwardly, as shown in Fig. 1. By turning the'telescopicsection to the right relatively to the handle-section the telescopic section may be clamped in the handle-section, as before explained. To unlock the tool, it is only necessary to turn the telescopic section slightly to the left to release it from the grip of the adjustable bearing or chuck and then'push it forward to unlock the tool-chuck.

.It will be observed that it is not necessary to clamp the telescopic section with any considerable force, a very slight^turn of the nut I usually being all that is needed; but the telescopic section may be firmly clamped and locked, if desired.

I do not wish to be understood as confining myinven tion to the precise form of adjustable bearing or chuck shown and described or to the particular style of handpiece to which my improvement is shown as applied, as any suitable form of adjustable bearing or chuck may be employed, and the improvement is applicable to any style of handpiece of the class employing telescopic mechanism for operating the tool-holding chuck. The means shown for operating the adjustable bearing or chuck may also be varied without departing from the spirit of my invention, and, if desired, it may be operated directly by the fingers instead of through the telescopic section. Instead of the split-ended metal chuck I may use a tubular packing, as of leather or other yielding material, which may be caused to frictionally bear upon .the telescopic section and vact as an adjustable bearing or packing therefor.

I claim as my invention l. The combination, in a Vdental-engine handpiece, 0f the handle-section, the telescopic section, the adjustable bearing for clamping the two sections together, and the connections for actuating the adjustable bearing by the telescopic section, substantially as set forth.

2. The combination, in a dental-engine handpiece, of the handle-section, the telescopic section, the tubular spindle in the handle-section, the tool-locking chuck in said tubular spindle, means actuated by the endwise movement of the telescopic section for locking and unlocking the tool-locking chuck, and the adjustable bearing for clamping the telescopic section to the handle-section, substantially as described.

3. The combination, in a dental-engine handpiece, of the handle-section, the telescopic section having slidingV or telescopic connection with the handle-section, the adj ustable bearing carried by the handle-section and adapted to frictionally clamp the telescopic section, and the nut or collar actuated by the telescopic section for operating said adjustable bearing, substantially as set forth. In testimony whereof I affix my signature in presence of two witnesses.

J OI-IN W. GILBERT.

Witnesses: y

GEO. W. CLEMENT, HARRY R. BARBER.