US19052A - Improvement in dentistss operating-chairs - Google Patents

Description

2 Sheets-Sheet 1.

G. w. TRIPP.

DBNTISTS CHAIR. v No. 19,052. Patented Jan. 5, 1858.

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2 Sheets-Sheet 2.

G. W. TRIPP.

DENTISTS CHAIR.

No. 19,052. Patented Jan. 5, 1858.

UNITED STATES PATENT OFFICE.

GEORGE W. TRIPP, OF AUBURN, NEV YORK.

IMPROVEMENT IN DENTISTS OPERATING-CHAIRS.

Specification forming part of Letters Patent No. 19,052, dated January 5,1858.

To all whom zit may concern.-

Be it known that I, GEORGE \V. TRIPP, of Auburn, in the county of Cayuga, State of New York, have invented certain new and useful Improvements in Dental Operating- Qhairs, of which the following is a full, clear, and accurate description, reference being had to the accompanying drawings, forming part of this specification, in which- Figure 1 represents a sectional elevation of a dental chair embracing my improvements.

' Fig. 2 represents a plan of the under side of the chair. Fig. 3 represents a rear elevation of the same; and Fig. 4 represents a plan of the supporting-frame of the chair, showing the arrangement of the holding-catches.

In the construction of dental chairs and in the arrangement of the adjusting mechanism the object to be attained is to place the head of the patient under the least possible restraint and in the most favorable attitude for the operator.

To effect this with ease, rapidity, and accuracy has been the object of my improvements in this class of chairs, and itonly can be done by the operator having perfect and entire control of all the adjusting mechanism from his operating position in the rear of the chair, (Without stooping,) as in that position he is enabled to overlook the patient and at once regulate and make the different adjustments for placing the patient in the proper position without the necessity of repeated trials.

The objections to the dental chairs as heretofore constructed are that the different adjustments are not sufficiently independent of each other, one adjustment frequently affect ing others, and some of the adjustments can only be made when the patient is out of the chair. The adjusting mechanism is also arranged so as to operate from different parts of the chair, and to make some of the adjustments the operator is obliged to stoop, thereby preventing him from observing the degree of change he has made in the position of the patient, thus frequently involving the necessity of readjusting the chair before the patient is placed in the right position.

The object of my improvements is to over come the beforeanentioned defects in dental chairs; and my invention for effecting this consists, first, in arranging the handles of the holding and releasing catches of the adjusting mechanism in connection with the arrangement of the adjusting mechanism, so that the operator from the rear of the chair and without stooping has entire control of all the adjusting mechanism, thereby enabling him while in his operating position to adjust and regulate the chair, so as to bring the patient in the most favorable position for operating; second, in arranging the adjustable rods for regulating the height and also the inclination of the chair, so that one set is made the fulcrum on which the chair turns and is steadied while the other set is being raised or depressed, and the chair itself forms a powerful bent lever by which the operator is enabled to make these adjustments from the rear while the patient is in it.

In the accompanying drawings is represented an adjustable dental chair embracing my improvements.-

The body A of the chair is constructed on the most approved form for dental chairs and is supported by a stand B, to which are attached the different catches for holding the chair in position as it is adjusted.

On the under side of the body of the chair is a strong metallic frame 0 in the form of a letter X, with the ends connected, and extends from the front to the rear.

The seatD of the chair is movable and rests on an adjustable notched standard a, passing through the center of the frame C. To the lower end of the standard is hinged alever b, which is pit'oted to a stud c and extends back to the rear of the chair. In the outer end of the lever are two pins 6 f, for holding a bent operating-bar g, for raising and lowerof the chair, so as to be out of the way and in a convenient situation for the operator, and it is held in that position by notches 7L on the end of the lever, in which it catches as it is raised after being depressed for the purpose of elevating the seat.

A spring holding-catch i, operated from the back of the chair by the knee, holds the seat as it is raised by springing into notches 7c in the standard a.

To the sides of the metallic frame are hinged supporting-rods Z, which pass through brack ets m, confined to the sides of the stand. Spring-catches a work through the brackets and hold the rods Z in place, and also the ing the seat. The bar stands close to the back the chair at any inclination.

chair as it is raised or lowered. The catch rods 71 passthrough a girt 0, connecting the sides of the stand, and are riveted to a crossbar 19, which is operated by a rod q, extending to the rear of the chair.

A link 4", for regulating the inclination of the chair, is hinged to the bottom of the chair in front and is provided with adjusting-holes 8, into which enters a spring-catch t, to hold The catch-rod 15 extends to and is operated from the rear of the chair. I

A head-rest E is hinged by a rod u, on which it slides, to an adjustable bar '0, which enters the top of the back of the chair and is confined to it by a clamp w A clamp 00 also holds the rest E to the bar 1) and admits of its being inclined or slid laterally, while at the same time it can be turned transversely to the back of the chair by turning the bar 11 in its clamp.

The different adjustments are made as follows:

The seat is raised by depressing the bent bar g and lowered by depressing the same bar until it receives the weight of the seat. lVhen the holding-catch 2' is released by the pressure of the knee, then the bent bar is raised, thus gradually lowering the seat to the prop er position.

To elevate the chair, the operator inclines it forward by pressing against the top with his hand, and in lowering it the catch-rod q is depressed by the foot "and the chair eased down by the operator placing his hand on the back. In adjusting the inclination the catchrod i is pressed in by the leg and the chair inclined backward or forward by the hand of the operator. It will be seen that from the position of the elevating and supporting rods land inclining link 0" they respectively act as a fulcrum on which the chair turns while one or the other adjustment is being made and at the same time steady the chair, preventing it from inclining laterally. The chair also by this arrangement forms a powerful in dental operating-chairs, what I claim therein as new, and desire to secure by Letters Patent, is

1. The arrangement of the holding and releasing catches and of the adj usting mechan ism, as described, so that all the adjustments can be made from the rear of the chair without stooping.

2. Combination of the supporting-rods Z with the inclining link 7*, arranged as described, for the purpose herein set forth.

In testimony whereof I have subscribed my name.

GEORGE \V. TRIPP.

WVitnesses:

EDWARD RATHBUN, EDWIN R. GRIDLEY.

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