US1814877A - Dental chair - Google Patents

Description

July 14, 1931. W R 1,814,877

DENTAL CHAIR Filed Dec. 3l 1928 4 Sheets-Sheet l W GU01: n Q1 7 Hell] 15. PI eber July 14, 1931. H. E. WEBER 1,814,877

DENTAL CHA I R Filed Dec. 31 i928 4 Sheets-Sheet 2 Hen/g5. Piber July 14,1931. H. E. WEBER 1,814,877

DENTAL CHAIR il 1928 4 SheetsTSheet 3 46 43 N 47 52 no GROWN:

Jul 14, 1931.

H. E. WEBER 1,814,877

DENTAL CHAIR Filed Dec. 51, 1928 4 Sheets-Sheet 4 2 Q42 32 16/! Q7 28 7 L 75 t I j; f 22 a i ll 9:8

bfelzlyl Weber Patented July 14, 1931 UNITED "STATES,

PATENT OFFICE HENRY E. WEBER, OF CANTON, OHIO, ASSIGN'OB TO THE WEBER DENTAL MANUFACTUR- ING COMPANY, OF CANTON, OHIO, A CORPORATION OF OHIO I DENTAL CHAIR Application filed December 31, 1928. Serial No. 329,474.

the back rest and foot rest, and the back rest,

even though balanced with the foot rest-in certain positions, is likelyto drop back suddenly when the securing clamp is released, and the patient isleaning against the back rest. I 4

Accordingly the objects of the present improvements include the provision of a dental chair of the foregoing description, and including an improved back rest which clears and does not interfere with the other parts of the chair during adjustment of the same, and including improved yielding balancing means for the back rest and foot rest, preventing sudden dropping of the back rest,

and assisting raising of the same.

Further objects of the present improvements include the provision of a novel struc-,

ture and arrangement for the back rest and other parts of the chair, as will be set forth in detail hereinafter.

A preferred embodiment of the invention is illustrated in the accompanying drawings forming part'hereof, in which Figure 1 is a side elevation of the im-' proved dental chair, the back rest and foot rest being adjusted to accommodate a patient in substantially erect position;

Fig. 2, a fragmentary view similar to Fig. 1 illustrating a preferred detachable foot Y rest platform for the chair;

Fig. 3, an enlarged sectional view illustrating details of the improved back rest, as on line 33, Fig. 1;

Fig. 4, a view similar-to ing the back rest and foot rest of the chair Fig. i 1, illustrat moved to accommodate a patient in a reclining position, 'theback rest and adjustable support therefor clearing all the other parts of the chair;

Fig. 5, an enlarged fragmentary view similar to Fig. 1, with portions broken away, and illustrating novel details of the improvedback rest;

Fig. 6, a section view illustrating details of one of the improved clamps thereof, as on line 66, Fig.

Fig. 7, a sectional view illustrating details of another of the improved clamps thereof, as on line 77, Fig. 5;

Fig. 8, a View similar to Fig. 4, with portions broken away illustrating the improved yielding, balancing means for the back rest and foot rest; and

Fig. 9, an enlarged fragmentary plan view thereof as on line 9-9, Fig. 8, with portions removed and broken away.

Similar-numerals refer to similar parts throughout the drawings.

The improved dental chair indicated generally at 10 includes an elevator indicated generally at 11, and upon the upper end of the raising and lowering jack 12 of the elevator a seat 13 is mounted.

The seat 13 is preferably mounted, as by means of pivot screws 14, on the upper-end of the jack 12 for pivoting abouta horizontalaxis, and any well known clamp actuated bya lever 15 is provided for securing the seat 13 at any desired angular position with respectto the vertical axis of the elevator. As illustrated the upper surface of the seat is horizontal.

An improved back rest indicated generally at 16 is mounted, as by means of pins 17, at the rear of the seat for pivoting about a horizontal axis, preferably parallel with the axis of the screws 14-; and a foot rest indicated generally at 18 is mounted, as by means of screws 19, at the front end of the seat 13 for pivoting about a horizontal axis preferably parallel with the axes of the screws 14 and of the pins 17. g

The foot rest '18 preferably includes a frame depending from the pivotal mount ing screws 19, and the frame 20 may have a childs foot platform indicated generally at 21 pivotally mounted therein.

For enabling the chair to be used not only by a dentist but by an ear specialist or the like, the platform 22 for the foot rest is preferably removably secured at the lower end of the frame 20, as by means of notches 23 in the one adapted for removable engagement with screw pins 24 in the other.

The improved back rest 16 preferably includes an adjustable support indicated generally at 25 extending upwardly from the pivot pins 17; and the support 25 preferably includes a pair of laterally spaced upwardly extending supporting rods 26, which extend through slide apertures 27 formed in a sliding supporting head 28, and the sliding headmay be secured at any desired position on the supporting rods 26 by means of a screw clamp 29 actuated by a lever handle 30.

The sliding head 28 is pivotally connected at each side of the chair, as by means ofa pivot screw 31 with one end of a back rest positioning link 32, the other end of which is pivotally connected, as by means of a pivot screw 33 with a side of the seat 13.

Accordingly, the relative angular position of the back rest with respect to he seat may be varied, by releasing the clamp 29 and moving the sliding head 28 upwards or downwards on the supporting rods 26, until the back rest has been pivoted about the pins 17 to the desired position, after which the clamp 29 may be actuated to reengage the sliding head 28 with the supporting rods 26.

During such pivotal movement of the support 25, the back rest ositioning links 32 will be pivoted about their mounting screws 33.

For simultaneously pivoting the foot rest 18 about its mount-ing screws 19, one end of a connecting link 34 is pivotally connected as by means of a pivot screw 35 with each positioning link 32, and the other end of each connecting link 34 is pivotally connected as by means of a pivot screw 36 with a side of the frame 20, and the locations of the pivot screws 35 and 36 with respect to the screws 33 and 19 are such that the back rest and foot rest will balance each other in any position.

A back rest mounting bracket 37 is longitudinally slidably secured to the supporting head 28 preferably by means of an im proved automatic pistol grip clamp 38, and the mounting bracket 37 preferably includes a member 39 extending forwardly and downwardly therefrom, and spaced therefrom, so that regardless of the position of any of the moving parts of the chair, the bracket member 39 will always clear the several chair parts.

An improved back rest .40 is yieldingly supported on the bracket member 39, so that the back rest 40 will always clear all parts ofthe chair.

The bracket member 39 preferably includes arms 41 and 41 laterally extending from the lower end thereof, and upon the extremities of which arms, the back rest 40 is pivotally mounted adjacent its lower end, as by means of horizontally extending coaxial screws 42 and 42 secured'respectively in the arms 41 and 41.

The back rest 40 is preferably yieldingly pivotally mounted on the member 39, as by means of a plunger 43, pivotally secured atits outer end as by means of a horizontal pivot screw 44 to the upper end of the back rest 40, and extending into a rearwardly extending and forwardly opening socket 45 formed in the upper end of the mounting bracket 37.

The main body of the socket 45 is preferably larger in diameter than the main body of the plunger 43, and a stop collar 46 is preferably formed on the plunger 43 intermediate the ends thereof. Between the collar 46 and the back rest, the plunger 43 extends through an externally threaded sleeve 47 which is screwed in the outer end ofrthe socket 45 for forming a stop cooperating with the stop collar 46 and limiting the outward movement of the plunger 43. A washer 48, )referably of resilient material such as rubber, is interposed between the stop collar 46 and the sleeve 47.

The inner end 49 of the socket 45 is preferably of reduced diameter for slidably receiving the inner end of the plunger 43, and for forming a stop shoulder 50 cooperating with the stop collar 46 to limit inward movement of the plunger, and a washer 48,-preferably of resilient material such as rubber, is interposed between the collar 46 and the shoulder 50.

The plunger 43 has preferably formed therein an axially extending socket 51 opening from its inner end, and a compression spring 52 is inserted in the socket, and one end of the spring reacts against the end 53 of the plunger socket, and the other end reacts against the end 54 of the bracket socket, whereby the back rest 40 is mounted for yieldingly pivoting about the horizontal axis through the screws 42 and 42, but is incapable of any other displacement, and accordingly accommodates the back of the patient, without changing the relative position of any particular patient after the patient has resumed a normal posit-ion of rest, subse quent to the patients movement to use a cuspidor or the like.

The back rest mounting bracket 37, as aforesaid is longitudinally slidable on the supporting head 28, preferably by providing each with longitudinally extending tongues and grooves inter-fitting and longitudinally sliding on tongues and grooves of the other. I

For securing the bracket 37 in any desired longitudinal position with respect to the head, the improved automatic pistol grip clamp 38, includes a shank 55 secured in and extending rearwardly from the lower end of the bracket 37 through a vertically extending slot 56 in the head 28. i

A cam lever 57 is pivotally mounted on a horizontally extending pivot pin 58 secured at the outer end of the shank 55 rearwardly and beyond the rear face 59 of the head 28, and a clamping washer 60 is interposed between the cam head 61 of the cam lever 57, and the rear face 59 of the sliding head 28, and the cam head61 is so shaped that pressure tending to pivot the cam lever 57 towards the sliding head 28 clamps the washer 60 against the rear surface 59 thereof, and secures the mounting bracket 37 in engagement therewith at any desired longitudinal position of the mounting bracket with respect to the head.

Yielding means are provided for normally urging the cam lever 57 towards the head 28 for clamping the bracket on the head, by a compression spring 62, one end of which reacts against the rear side of the cam lever 57 and the other end of which reacts against a pistol grip casing 63, which is supported on the outer ends of the pin 58, and in which casing the cam lever is preferably arranged to pivot.

The automatic pistol grip clamp 38 will thus release the bracket 37 from engagement with the head 28, by squeezing the pistol grip 63 and the cam lever 57, after which the bracket 37 may be slid longitudinally up and down to any desired position of elevation.

Instantaneously upon releasing the pistol grip and cam lever, the brackets 37 will be secured in engagement with the head 28.

A head rest indicated generally at 64 is longitudinally slidably secured at the upper end of the bracket 37, by clamping means indicated generally at 65, and which are.

similar to the clamp 38.

The back rest 40 preferably includes a metallic plate 66 curved to conform with the shape of the back, and preferably integrally cast from an aluminum alloy.

Rearwardly extending lacing hooks 67, are formed on the back face of the plate 66, and a pad 68 preferably of resilient material is laid against the front face of the plate 66. A covering 69 of leather or the like, is pulled taut over the front of the pad '68 and the ends of the pad and the plate, and secured by means of a lacing 70, which passes The hooks 67 and lacing 70 are preferably cludes a reciprocating rod 74, one end: of which is'pivotally connected with an upper end member of the foot rest frame 20, as by means of a hook 76 extending through asuitable aperture in the foot rest frame member 75. I

i The other end of each rod 74 preferably extends through a suitable aperture provided in one of a set of lugs 77 depending from the seat 13.

At the rear side of each lug 77 the other end of each rod 74 is provided at its extremity with a preferably removable nut head 78 screwed thereon, and a compression spring 79 is interposed between each head 78 and each lug 77.

The springs 7 9 reacting between the heads 78 and the lugs 77 thus yieldingly balance the back rest and foot rest, and prevent sudden dropping of the back rest, and assist raising of the same, since the springs 79 will be loaded to a maximum when the back rest is in reclining position.

I claim: 7

1. A dental chair including a seat, a back rest support pivotally mounted on the seat, a foot rest pivotally mounted on the seat, means operatively connecting the back rest support and the foot rest for simultaneously pivotally moving the one when the other is pivotally moved, a mounting bracket secured upon the support and including a member extending therefrom and spaced from the operating means for clearing the same during movement thereof, a back rest pivotally mounted on the member, and means connected between the foot rest and seat for yieldingly resisting pivotal movement-of the back rest.

2. A dental chair including a seat, a back rest support pivotallymounted on the seat, a foot rest pivotally mounted on the seat, means operativel connecting the back rest support and the 'oot rest for simultaneously pivotally moving the one when the other is pivotally moved, a mounting bracket secured upon the support and including a member extending therefrom and spaced from the operating means for clearing the same during movement thereof, and the member including arms extending laterally thereof, a back rest pivotally mounted on the arms, and means connected between the foot rest and seat for yieldingly resisting pivotal movement of the back rest.

3. A dental chair including a seat, a back rest support pivotally mounted on the seat, a foot rest support pivotally mounted on the seat, a sliding head adjustably mounted on the back rest support, means operatively connecting the sliding head and the foot rest for simultaneously moving the sliding head when the foot rest is pivotally moved, a.

mounting bracket slidably secured to the sliding head and including a bracket arm extending therefrom, a back rest pivotally connected at its bottom side with the bracket arm and yieldingly connected at its upper side to the mounting bracket, and a. head restsupport slidably mounted on the mounting bracket.

In testimony that I claim the above, I have hereunto subscribed my name.

HENRY E. WEBER.

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