Improvements in dental engines / [William Perry Horton].

  • Horton, William Perry.
Date:
1893
Catalogue details

Licence: Public Domain Mark

Credit: Improvements in dental engines / [William Perry Horton]. Source: Wellcome Collection.

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    Lake & Improvements in Dental Engines. rear end or extremity of the driving shaft. This arm is connected by a wire with the positive pole of the battery, and it forms a contact with the rear end of said shaft, so that when the current is applied or completed by the placing of the electrode into contact with the face or other part of the person of the patient, and the burr against the tooth to be operated upon, the current will pass from the 5 positive pole of the battery through the second arm thence into and through the shaft and burr from whence it issues to the nerve and deadens the latter. The rear end of the shaft forming the contact with the said arm is preferably reduced and said arm where it is engaged by said reduced end of the shaft is preferably thickened so as to prevent its rapid wearing away by the friction incident to the 10 rotation of the shaft. It will of course be understood that said arm does not rotate with the shaft. The driving shaft is inclosed within a tube or sleeve wdiich is suitably constructed so as to not interfere with the flexibility of the lower end of the shaft, and should be made of a suitable insulating material to prevent the current escaping from the 15 shaft other than through the burr. The lower end of the shaft is preferably made of flexible non-conducting material, but I do not limit myself to this specific construction. At its lower end it is provided with a hand-piece which should be made of non-conducting material. The arms should be insulated in order to prevent the passage of the current from 20 them into the standard or the sleeve surrounding same. Dated this 21st day of March 1893. HASELTINE, LAKE & Co., 45, Southampton Buildings, London, W.C., Agents for the Applicant. COMPLETE SPECIFICATION. 25 Improvements in Dental Engines. 1, Henry Harris Lake, of the Firm of Haseltine, Lake & Co., Patent Agents, 45 Southampton Buildings, in the County of Middlesex do hereby declare the nature of this invention and in what manner the same is to be performed, to be particularly described and ascertained in and by the following 30 statement:— This invention relates to dental engines, and its principal object is to provide a dental engine, in which the burr and burr-operating shaft revolves, with means whereby a current of electricity may be passed through said shaft and burr thereby deadening the nerve and counteracting the pain incident to boring into a tooth. 35 To this end the invention consists in certain peculiarities in the construction, arrangement and combination of the several parts substantially as hereinafter described. In the accompanying drawing illustrating my invention :— f igure 1 is a side view of part of a dental engine showing the same adapted to 40 my improvement. f igure 2 is a section on the line 2—2 of Figure 1, and figure 3 is a section on the line 3—3 of Figure 1. A represents the upper part of the standard of a dental engine, B the burr actuating shaft, and C, the burr on the end of said shaft. The shaft B is shown 45 divided transversely and its sections connected by a flexible shaft B1 whereby the burr C may have its necessary freedom of movement in every direction, but it is obvious that the shaft may be otherwise constructed for this purpose. The rear end of the shaft B has its bearing in an arm D, which has a sleeve E at its lower end fitted upon and rigidly secured to the upper end of said standard A. 50 A pulley f mounted upon the rear end of shaft B adapts said shaft for connection with a suitable means for operating it. G designates a source of electricity, one pole of which by the wire I1 communicates with the dental engine in the manner