US596667A

US596667A - Dental chair

Info

Publication number: US596667A
Authority: US
Publication date: 1898-01-04
Anticipated expiration: 1915-01-04

Description

(No Model.) 2 shetsfsne 1.- N. M. ROSE. DENTAL CHAIR.

Patented Jan. 4,1898.

l, we? I .l ....mll logeljlcr (No Model.) z sheetssnet 2.

N. M. MSE.

DENTAL CHAIR* No. 596,6. Patented Jan. 4, 1898.

UNITED STATES PATENT OFETCE.

NICHOLAS M. ROSE, OF BOVVIE, TEXAS, ASSIGNOR OF ONE-HALF TO P. N. HUDSPETH,

or SAME PLACE.

DENTAL CHAIR.

SPECIFICATION forming part of Letters Patent No. 596,667, dated January 4, 1898.

Application filed J' une 2 5, 1 8 9 7.

To all whom it may concern:

Be it known that I, NICHOLAS M. ROSE, a citizen of the United States, residing at Bowie, in the county of Montague and State of Texas, haveinvented a new and useful Dental Chair, of which the following is a specification.

This invention relates to folding and adjustable chairs especially designed for use by dentists, physicians, or barbers; and the object of the invention is to provide a chair of simple and inexpensive construction which may be easily adjusted to variousA positions and be folded into very compact form for transportation or storage.

With these objects in view the invention consists of the 'several details of construction and combination of parts, as will be hereinafter fully described, and particularly pointed out in the claims.

In the drawings, Figure 1 is a perspective view of the chair in one of its open positions. Fig. 2 is a side elevation showing the chair in another of its open positions. Fig. 3 is a similar view looking at the opposite side and showing the chairrin still another position. Fig. 4 is a view of the chair folded. Fig. 5 is a transverse section through the joint between the side rail of the back of the chair and the arm. Fig. 6 is a longitudinal section of a portion of one of the side rails of the back. Figs. 7 and 8 are views of detached details.

Similar reference-numerals indicate similar parts in the several figures.

The two pairs of legs are indicated, respectively, by 1 and 2, the pair indicated by 2 being narrower than the pair indicated by 1 and fitting between them. These legs are pivotally connected intermediate their ends, as indicated at 3, in a manner similarto that in which the legs of an ordinary camp-stool are pivoted together. The lower ends of each pair of legs are connected and braced by rods 3, and the upper ends of the pair of legs 2 are connected by arod 4, which rod extends across the front faces of the legs, and their ends are given a return-bend, as indicated at 4a, and secured in the legs. The. upper ends of the legs 1 are connected together by a bar 5, which turns freely in them.

6 indicates a bar which is pivoted at its Serial No. 642,297. (No model.)V

with an upwardly-projecting hook S, for a purpose to be hereinafter referred to.

9 indicates a foot-rest which is hinged on one of the cross-bars 3 of the legs 2, and 10 'indicates supporting-legs which are hinged to the front end of the foot-rest to support it, and these legs are held in position by means of brace-rods 11, which are pivoted to the under face of the foot-rest and are provided with hooks 12 at their free ends, adapted to be detachably engaged by eyes 13 on the legs 10.

14 indicates the side rails, between which the back 15 of the chair is supported. Each of these rails is-provided with a T-shaped groove, extending longitudinally thereof and opening out on the outer sides of the rails. Each groove is provided with a series of notches 17, arranged in the front wall of the groove.

The connecting-rod 5 extends at each end beyond the legs 1, and on these projecting ends the lower ends of the arms 1S are pivoted. The upper ends of these arms are provided with headed pins 19, which project into the T-shaped grooves 16 in the side rails 14 in such manner that the head of the pin will work in the head of the slot and the stem of the pin be adapted to engage either of the notches 17, whereby the connection between the upper ends of the arms 18 and the side rails 14 may be adjusted as desired.

20 indicates the seat, which may be of leather, webbing, or any other suitable material possessing the desired strength andl flexibility. This seat is secured at one end on the connecting-rod 4 and at its other end to rod 5, on which it is adapted to be wound.

One end of the rod 5 projects beyond the arm 9 5 18 and is provided with aratchet-disk 21, and this end of the rod 5 is squared to receive a key 23, by means of which the rod may be turned in order to wind the seat upon it.

24 indicates a spring-actuated dog, which which is pivoted on Athe bracket 27, and is soV arranged that the head-rest may be freely adjusted upwardly or can be moved downwardly until the dog is released from the notches.

30 indicates a fork the stem ofwhich is bent at an obtuse angle to the arms 32 and is adapted to be removably fitted in a hole 33, which is bored diagonally in the left-hand arm of the chair. The arms 32 of the fork will preferably be of spring metal, and are adapted to grasp and support a cuspidor 34.

From the foregoing description it will be evident that the upper ends of the legs 1 and 2 may be spread apart as much as desired and securely held in their adj usted position by means of the notched bar 6, and that the seat 2() may be wound or unwound from the cross-bar 5 to suit the adjustment of the legs. It is also evident that the inclination of the back may be operated as desired, and that the back will be held in its adjusted position by means of the engagement of the headed pins 19 at the upper ends of the arms with the notches 17.

In order to fold the chair together, the notched bar 6 will be disengaged from the cross-rod 3 of the legs 2 and be folded up against the rear end of the seat and the hook 8 be caused to engage the connecting-rod 4. The legs may then be foldedin close together, and the back and arms may be turned backwardly until they lie close against the legs. The brace-rods 11 will also be disengaged from the legs 10, when the foot-rest can be folded up between the legs against the notched bar 6 and the legs 10 be folded against the foot-rest. It desired, the cuspidor may also be supported between the back of the chair and the foot-rest, as indicated in the drawings. secured around the folded chair, and it may then be easily transported.

It will be understood that changes in the form, proportion, and minor details of construction may be resorted to without departing from the spirit or sacrificing any of the advantages of this invention.

Having thus described the invention, what I claim isl. In a chair,the combination of cross pairs of legs pivotally connected together intermediate of their ends, cross-rods connecting the upper and lower ends of the legs of the respective pairs, the upper cross-rod of one A shawl-strap may then be pair of legs being revoluble and extended at each end beyond its legs, and the other upper cross-rod being non-revoluble, a seat of flexible material secured at one end to the nonrevoluble rod and connected at its other end to the revoluble rod to be wound thereon, means to turn the revoluble rod and lock it in position, a back secured between two rails the lower ends of which are pivoted to one pair of legs, arms pivotally mounted on the extended ends of the revoluble rod and adj ustably connected at their upper ends to the side`rails of the back, and a notched bar pivotally connected to the lower cross-bar of one pair of legs and adapted to engage the lower cross-bar of the other pair of legs, substantially as and for the purpose specified.

2. Ina chair, the combination of crossed pairs of legs pivotally connected together intermediate their ends, cross-rods connecting the upper and lower ends of the legs of the respective pairs, the upper cross-rod of one pair of legs being revoluble and extending at each end beyond the legs, a back pivoted at its lower end to one pair of legs, arms pivoted at their lower ends to the extended ends of the revoluble rod and adjustably connected at their upper ends to the said back, a ratchetdisk secured on one of the extended ends ot the revoluble rod outside one of the arms, a spring-actuated dog on the arm adapted to engage the teeth of the ratchet-disk, a seat of iiexible material connected at one end to the revoluble rod and adapted to be wound thereon at its other end to the upper cross-rod of the other pair of legs, and a key to turn the revoluble rod, substantially as described.

3. In a folding chair, the combination of crossed pairs of legs, connecting cross-rods at their upper and lower ends, a bar pivoted on the lower cross-rod of one pair of legs and having notches on its lower face adapted to engage the lower cross-rod of the other pair of legs, a hook projecting upwardly from the free end of the said bar and adapted to engage the upper cross-,rod of one pair of legs when the chair is folded up, a back pivoted at its lower end to the upper ends of one pair of legs, and arms pivoted at their lower ends to the upper ends of the other pair of legs and having a sliding connection with the back p at their upper ends, the construction being such that the legs may be folded together and the back and arms folded down close to the legs, substantially as described.

In testimony that I claim the foregoing as my own I have hereto aixed my signature in the presencel of two witnesses.

NICHOLAS M. ROSE.

Witnesses:

NAT. D. ENsLER, R. E. AYREs.

IOO