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Publication numberUS945194 A
Publication typeGrant
Publication dateJan 4, 1910
Filing dateJun 4, 1903
Priority dateJun 4, 1903
Publication numberUS 945194 A, US 945194A, US-A-945194, US945194 A, US945194A
InventorsFrank Ritter
Original AssigneeFrank Ritter
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Dental chair.
US 945194 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)




945, 1 94;. Patented Jan. 4, 1910.


Inventor. CYL Aem mum, a zum :o Mvc-umonmrnsns www0 TTTTT c F. RITTER.

DENTAL CHAIR. APPLICATION FILED JUNE 4, 1903. 945, 1 94. Patented Jan, 4, 1910.


QQ Attorney.



ArrLIoATIoN FILED JUNI: 4, 1903.

945,194. Patented'Jan. 4, 1910.


` Inventor.

/L Attorney Witnsses. v



Specification of Letters Patent.

Application filed June 4, 1903.

.Patented J an. 4, 1910.

Serial No. 160,100.

To @ZZ whom tt may concern:

Be it known that I, FRANK RITTER, of Rochester, in the county of Monroe and State of New York, have invented certain new and useful Improvements in Dental Chairs; and I do hereby declare the follow ing to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming a part of this specification, and to the reference-numerals marked thereon.

My present invention relates to chairs and particularly to that class known as dental, surgical or barber-s chairs and it has for its object to provide a movable back portion and a suitable locking mechanism therefor adapted to secure the back against outward movement and which is automatically released to permit the back to be re turned to its normal or upright position.

My invention also includes a back rest adapted to be converted into a childs seat mounted upon an adjustable portion of the chair frame which is secured by an improved form of clamping device whereby the rest may be adjusted relatively to the main seat of the chair when employed either as a support for the back of a person occupying` the seat, or as a supplemental or childs seat.

My invention also has for its object to provide arms upon the chair which are so attached that they may be easily adjusted relatively to afford the greatest convenience to the occupant of the chair.

To these and other' ends the invention consists in certain improvements and combinations of parts, all as will be hereinafter more fully described, the novel features being pointed out in the claims at the end of the specication.

In the drawings: Figure 1 is a vertical sectional view of a dental chair constructed in accordance with my invention. Fig. 2 is a side elevation thereof partly in section. Fig. 3 is a horizontal sectional view on the line 3 8 of Fig. 1. Fig. 4L is a top plan view of the childs seat taken on the line 4--11 of Fig. 1. Fig. 5 is a side elevation of the back rest and the supplemental frame upon which it is mounted. Fig. 6 is a vertical cross sectional view thereof. Fig. 7 is a detail sectional View of the locking device taken on the line 7-7 of Fig. 2. Fig. 8 is a similar view taken on the line 8-8 of Fig. 7. Fig. 9 is an enlarged rear elevation of the guide block for the adjustable portion of the back frame. Figs. 10 and 1l are sectional views on the lines 10-10 and 11-11 respectively of Fig. 1. Fig. 12 is a sectional View on the line 12-12 of Fig, 9. Fig. 13 is a sectional View on the line 13-13 of Fig. 5.

Similar reference numerals in the several figures indicate similar parts.

A chair constructed in accordance with my invention is adapted to be mounted upon any suitable form of base or pedestal but as the latter is not included in this invention I have omitted it from the illustrations, simply showing the vertically extending column or support 1 upon which the frame 2 is mounted embodying the downwardly extending legs 3 adapted to support the usual platform, the tilting adjustment of said platform being controlled by means of a lever 4 which may be operated to release the parts and to secure them in the desired position of adjustment in the usual man ner known to those skilled in the art.

Extending rearwardly above the frame and at either side are arms 5 to which are pivotally attached similar arms or projections which extend douuiwardly and for wardly from the chair back frame 7. At the lower end of the latter and at the center of the frame is pivotally attached a curved arm or member 8 which extends downwardly and is movable through an aperture in the relatively stationary seat frame 2 where it is engaged by a suitable locking device adapted to secure the back frame at any desired position of adjustment and to be automatically released when it is desired to change said adjustment. This locking device in the present embodiment of my invention consists of a wedge or block 10, arranged in said aperture in the frame, and provided in its rear side with a recess, the surface 15 of which is formed at a slight angle to the face of the wedge block, as shown. The proximate face or edge of the recess is formed with the surface 1G which is also inclined at a slight angle to the direction of movement of the wedge block and arranged with its lower end extending toward the opposite side of the aperture, as shown particularly in Fig. 7.

Arranged between the surfaces 15 and 1G isa roller 17, normally operating to hold the wedge block in contact with the arm 8 preventing the latter from being projected through the aperture but permitting it to be withdrawn therefrom. In order, however, to release the arm, and permit the back to be tilted into a more or less horizontal position, I provide a handle or lever 18 pivoted to the frame 2 at the point 19 and connected with the wedge block by means of a pin 20. Extending laterally from the end of the handle 1S is an arm having the upwardly extending' end 21 te which is attached a coil spring 22, operating to normally hold the levelI in the position shown in full lines in F ig. 7 and to retain the parts in the locked position.. The face of the aperture opposing the inclined face 1G, against which the arm 8 is clamped, is formed by a screw 11 adjustable relatively to compensate for any variation in the parts that may occur in assembling different chairs whereby the arm 8 and the aperture in the chair seat may be so positioned as to permit the proper operation of the locking devices. This manner of locking the chair back allows the operator to return it to the normal position without operating' the handle 18 which is an obvious advantage as it frequently happens that it is necessary to quickly return a patient from a reclining position into an upright position which may be done by simply elevating the chair back.

The chair arms, indicated by 23, are located at either side of the frame 2 and instead of forming them rigidly thereon I mount each of their supporting brackets 24- upon a stud 25 journaled in a recess in the boss 26, on the seat frame. This stud is longitudinally movable in the recess and the face of the bracket 24 is provided with small pins or projections 30 adapted toy engage and interlock with recesses in the boss 26 and to be held in contact therewith by a spring 31 encircling the stud as shown in Figs. 2 and 3. A number of recesses, in which the pins 30 engage, are provided so that the arms may be moved relatively inwardly or outwardly, as may be required, to accommodate the occupant of the chair and these recesses I form in a flange 12 on a collar 18 arranged in the boss 26 and forming a bushing in which the stud 25 is ournaled, the collar being held in position by a set screw lt providing an abutment or shoulder against which the spring 31 engages to limit its movement in a forward direction. Further, if desired, either of the arms may be rotated into a substantially horizontal position, as shown in F ig. 3, which provides a support against which an operator may lean while performing a diflicult or tedious operation, and to this end I form the brackets 24:, as shown, so that the ends of the arms 23 projecting' at each side thereof form hooks which will extend in rear of an operators leg affording the dual advantage of permitting hini to stand close to the chair and to brace his body as is required in certain classes of operations.

The main upholstered chair seat rests upon the frame 2 and it is only indicated in dotted lines but the upholstered back rest is shown in full lines and indicated by It is pivotally attached by small brackets 33 to the lower end of a supplemental back frame 34; pivoted at its upper end to the vertically adjustable portion or guide block 7 of the chair back frame, as indicated at 35. The pivotal connection between the back frame and the supplemental frame is provided to permit the support 32 to be moved outwardly, as shown in Iiig. 2, for the purpose of affording a better support for the hollow portion of the occupants back. This adjustment is regulated by means of a pawl 3G pivoted on the supplemental back portion 34e and engaging with the ratchet teeth 37 provid-ed on the guide block 7, said pawl being provided with laterally extending operating handles 3S. The pivotal connection between the back frame 34 and the back rest- 32 permits the upper end of the latter to be revolved forwardly, relatively to the chair, so that it extends over the seat thereon forming an additional support or childs seat which is located in closer proximity to the head-rest, as will be understood. The back portion 3st of the frame is provided with a filling of suitable material such as cane, indicated by 4:1, forming a back rest for the childs seat and the latter being' mounted thereon both the childs back and the seat may be adjusted vertically on the chair frame and also tilted at an angle thereto by the pivotal connection 35 and the pawl 36.

In order to support the childs seat I provide connections between the outer end thereof and the intermediate portions of th-e supplemental frame 34 and which, in the present instance, I have illustrated aschair arms consisting of a bracket 39 provided with the arm rest portions 40. These are attached to the back rest 32 by pivotal connections with the lugs or ears 50, permitting said arms to be folded, shown in dotted lines in Fig. Lt, when in the normal position,

but when it is desired to use the childs seat these arms .may be opened and. the hooked ends 51 of the brackets 89 engaged in corresponding notches or hooks 52 provided at the sides of the supplemental frame 'l 34. Extending' laterally from the brackets 39 and arranged in proximity to their pivotal points, are provided perforated lugs or extensions 53 in which are located spring operated latch members 54- adapted to engage small recesses 55 provided in the supplemental frame 34, as shown in Fig. 13. to retain the back rest 32 in the normal position when said parts are not employed as a childs seat.


Provided at the rear side o'f the back trame 7 is a vertically extending recess the parallel Sides 5G of which are undercut, as shown in Figs. 3 and 10, forming Ways, and movably mounted therein is a slide block 7 having the lower biturcated or split end, as shown at 5S in Fig. tl, forming the ends 59 and GO which are adapted to be separated to lock the movable back portions in adjusted position on the guides. The locl ing means for accomplishing this being a cam member in the form of a pin or stud 6l threaded in the part 5S) and provided with an operating handle (SQ, said screw thread operatingto move the pin longitudinally to separate the ends 59 and (l0 when rotated in one direction, as will be understood, its end abutting' against. the portion 60 ot' said block or against a wear piece or a set screw 63 which may be adjusted totake up lost motion between the parts. The handl-e 62 is normally operated in one direction by a spring 64 and provided beneath the operating handle is arranged a handle 65, and in proximity thereto, whereby the guide block and connected parts may be elevated or lowered when the operator releases the parts by a lnovenient otE th-e handle (32 against the tension of lthe spring (i-l. Pro- `vided in the rear side of the slide block is a longitudinally extending; recess having the sides (i6 undercut, forming guides similar to those in the frame 7, and operating' therein is a vertically movable block also split or bifurcated, the parts ot which are adjustable relatively to engage the guides by a screw 71, operated by a handle 7 2, actuated in one direction by a spring 73, as will be understood.

lrojectiiugrearwardly from the block 70 is a projection or bracket 7st provided upon its upper end with a clampingl head in the form of a ball 7 The head rest indicated by 7 G, is also provided with a clamping; head or ball 77 and the latter and the head 75 are connected by an intermediate section embodying the arms 78 and 79, connected at their ends by nuts or rings Si and adjustable relatively to each other by means of a bolt 82 and a hand wheel S3. It will, however, be understood that any desired :t'orm of adjustable head rest may loe employed, and I have, therefore, not claimed the one shown and described, as this feature of the invention forms the subject mattei' ot a subsequent application.

l claim as my invention.

l. ln an adjustable chair the combination with a seatframe having' an aperture provided at one ot its lateral sides with an inclined tace, and a back portion pivoted on the trame and provided with an arm eXtending through the aperture, et a wedge block arranged between said face and the arm and normally operating to prevent the movement ot' the latter and means 'for operating the block out of engagement with the arm.

2. ln an adjustable chair, the combination with a scat frame having opposing' faces thereon one ot which is inclined relatively to the other and a back portion pivoted to the trame having' an arm extendimgy between said faces, ot' a wedge block cooperating with the inclined tace operating to lock the arm against the opposing' t'ace and a handle tor operating' tht` block.

3. In an adjustable chair, the combination with a seat :frame and an adjustable back portion, opposinp` tacos on one of said parts one ot' which is inclined relatively to the other and an arm on the other part extending' between said faces, ot a clamping member cooperating,r with the arm, a roller arral'iged between it and the inclined face, an operating' handle attached to thc clamping member and a spring tor holding the latter in operative position.

4l. ln a locking' device, the combination with a stationary member having' opposing faces one ot' which is inclined relatively to the other and a men'iber movable relatively to the stationary member` ot' a clamping' block adapted to engage said movable member and provided with a recess and a roller arranged therein between the block and the inclined tace.

In a dental chair, the combination with a scat, a main back traine extent'ling above the seat and adjustable into angular relationship thereto, and a supplemental back .trame mounted on the main t'rame and adjustable at an angle thereto, ot' a back rest pivoted to the lower end ot' the suliipleniental frame and adapted to be rotated forwardly to form a secondary seat and means for supporting' the latter.

G. In a chair, the combination with a seat and an adjustable trame extending above the latter, oi a back rest', pivotal connections between it and the frame whereby the back rest may be operated to t'orln a secondary seat and means extending between the frame and back rest tor supporting the outer end ot' the latter when it is operated to form a secondary seat.

7. In a chair enlbodyinn' a seat and back trame, the combination with a supplen'iental :frame capable of angular adjustment relatively to the back trame, oi a back rest supported on the supplemental frame and adapted to be moved outwardly to form a supplemental scat located above the chair seat.

8. ln a chair` the combination with a chair frame comprising a seat and a main back frame which is adjustable to vary its angular position relatively to the seat, a supplemental frame carried on the main back frame, and means for supporting it in various positions of angular adjustment on said back frame, of a back rest movably connected to the supplemental frame and adapted to be moved to a position above the chair seat to form a supplemental seat and means ext-ending between the back rest and supple mental frame for supporting said rest when used as a` supplemental seat.

9. In a chair embodying a main seat and main back frame, the combination with a supplemental back frame capable of angular adjustment relatively to the main back frame and means arranged between said back frames for supporting the former in adjusted position on the latter, of a back rest supported on the supplemental frame and adapted to be moved outwardly to form a suppleniental seat located above the chaii seat.

10. In a chair, the combination with a main seat and a main back frame, a supplemental back trame and a supplemental seat adapted to be folded against the supplemental back frame to form a back rest above position of angular adjustment.

11. In a chair having a seat and back frame, the combination with a supplemental back frame adjustably supported on the latter and a back rest attached to the supplemental fraine and movable outwardly therefrom to form a supplemental seat, of supports adapted to extend between the supplemental frame and seat and arms arranged on the supports.

12. In a chair having a back frame, the combination with a back rest attached thereto, of brackets hinged to the back rest and normally lying between the latter and the frame, extensions on said brackets adapted to extend over the frame when the parts are in their normal position and locking devices operating between said extensions and the frame for locking the back rest in its normal position.

13. In a chair having a back frame, the combination of a back rest movably mounted thereon and brackets hinged to the back rest and normally lying` between the latter and the trame, extensions on said brackets adapted to extend over the sides ot the frame, when the parts are in their normal position, and spring operated locking devices arranged on said extensions engaging the frame to hold the back rest in its normal position.

14. In a chair, the combination with a seat and a back frame, of a portion adjustably mounted on the frame, a back rest attached to said portion of the frame and adapted to form a seat and means for supporting it.

15. In a chair, the combination with a back frame, a vertically movable portion thereon and a supplemental back frame at tached to said movable portion of the trame and adjustable at an angle thereto, of a back rest on the supplemental frame capable oi' adjustment into a. horizontal position.

1G. The combination with a frame having ways thereon and a biturcated block guided therein, ot' a member arranged in one of said bifurcations and movable longitudinally therein to operate the other bifurcation relatively to the lirst and means for operating the member.

17. The combination with a frame having ways. and a block guided therein, having two relatively movable parts, of a member mounted on one of the parts and movable into engagement with the other to separate them and an operating handle attached to said member.

18. The combination with a frame having ways and a slotted block guided therein, of a member provid-ed with a screw thread andv threaded into one of the portions of the block at'one side of the slot and movable into and out ot engagement with the other portion of the block, a handle for operating` the member and a spring for moving-the latter into the operative position.

19. The combination with a frame having ways and a block guided therein, having a slot forming two sections, of a revoluble cam member journaled in one of the sections and an adjustable wear piece engaged by the cam and located in the other section.

20. In a chair, the combination with a back frame, of a supplemental frame movably mounted thereon carrying a seat, a locking devicebetween the two frames, an operating handle for said locking device and a stationary handle on the supplemental frame arranged in proximity to the operating handle.

21. In a chair, the combination with a back frame having guides thereon, a block mounted in the guides, of a device for locking the block on the guides, an operating handle for said device and a handle on the block tor moving the latter, arranged in proximity to the operating handle, and a supplemental chair seat attached to said block.


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4366985 *Feb 13, 1981Jan 4, 1983Pelton & CraneAdjustable headrest for treatment chair
Cooperative ClassificationA47C17/12