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Publication numberUS562390 A
Publication typeGrant
Publication dateJun 23, 1896
Publication numberUS 562390 A, US 562390A, US-A-562390, US562390 A, US562390A
InventorsAaron P. Gould
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Dental chair
US 562390 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)


3 SheetsSheet 1;

' (No Model.)

No. 562,390. Patented June 23, 1896 [Man/2012 DENTAL CHAIR.

No. 562,390. Patented June 23, 1896.

Wi ma/ma 17 I flttemm;




SPECIFICATION forming part of Letters Patent No. 562,390, dated d'une 23, 1896. .i umm fil d, crime 12,1893. Serial No. 477,267. (No model.)

To all whom it may concern.-

Be it known that I, AARON P. GOULD, a citizen of the United States, and a resident of Canton, county of Stark, State of .Ohio,have invented a new and useful Improvement in Dental Chairs, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, making part of this specification.

My invention relates to improvements in dental and other chairs; and it consists in providing means for operating and controlling a fluid put under pressure by means outside of and independent of the chair, whereby the body of the chair may be raised,and means for lowering and holding the chair-body in desired vertical adjustment; also, in providin g a new and useful head-rest for said chairs.

In the accompanying drawings, Figure 1 is a perspective view of a chair embodying one part of my invention, the head-rest being removed. Fig. 2 is a vertical sectional view of the same, showing the chair and several of the parts supported thereby extended below the floor. Fig. 3 is a perspective view of the fluidconducting pipes and automatic cut-off. Fig. 4 is a vertical sectional View of the valve turned in a position to allow the chair to be elevated. Fig. 5 is a similar view showing the valve turned to allow the chair to be lowered. Fig. 6 is a similar view showing the valve turned to hold the chair in its vertically-adjusted position. Fig. 7 is a vertical sectional view of a portion-of the chair-back and the head-rest and supporting parts, and Fig. 8 is a detail perspective view of the split sleeve and the parts connected thereto.

Similar letters of reference indicate corresponding parts in all the figures of the drawlngs.

A represents the base, in which is supported a cylinder B, having atits upper end portion a well-knownform of stuffing-box 0, having therein a packing material a and follower or packing-gland b.

A piston-stem or chair-body support D of less diameter than the bore of the cylinder is provided, having at its lower end portion a piston-head E, made of a suitable material to form a joint with the walls of the cylinder, and at the top portion a circular disk Z, on which the body F of the chair is supported,

and about which it may be rotated and secured in desired adjustment, and to secure the stem D against rotation a small V-shaped groove 0 is provided in the side thereof, in which is placed a corresponding tooth projected from an annular metal plate d in the packing-box, either below or above the pack- .ing, which is also adapted to fill the groove to prevent the escape of fluid from the cylinder.

To operate the piston for the purpose of raising and lowering the body of the chair, a Water or fluid conducting pipe G is provided leading from a place of supply under pressure, which may be a city water-works pipe or an elevated tank, to the lower and upper end portions of the cylinder B, through the branch pipes H and J, which form a passage to the interior of the cylinder.

At the juncture of the supply-pipe G with the branches Hand J is placed arotary valve K, having therein ports 6 and f. L represents a waste-pipe leading to a place of discharge. M represents the valve-stem, and N a foot-lever or pedal by which the valve is operated.

To raise the piston and chair-body, the valve K is rocked by the foot of the operator on the pedal to bring the port 6 in register with the pipes G and H, (see Fig. 4,) through which water will flow into the cylinder B to raise the piston and the port f in register with the pipes J and L, by which water in the cylinder above the piston may escape to the place of discharge, and to lower the piston the valve K will be rotated to bring the port e in register with pipes Grand J, (see Fig. 5,) through which water will flow into the cylinder above the piston to force the piston and chair-body down, the same movement to bring the port f in register with the pipes H and L, through which water that was in the cylinder below the piston may escape to the place of discharge, and to secure the standard and chair-body in desired vertical adjustment the valve K is turned to position shown in Fig. 6, communication with the cylinder and the supply and discharge pipes cut off, and the piston sustained in position by the water in the cylinder below the head.

It will be noticed that the area of pistonhead on theupper side is small, while the lower side is the area of the diameter of the head, there being only power enough required above to overcome the friction of the packing about the stem D to lower the chair.

To prevent the piston-head ascending or descending to strike or come in contact with the ends of the cylinder and do violence thereto, an automatic mechanism is provided to rotate the valve K to stop the inflow of Water.

Referring to Figs. 2 and 3, on the inner end of the valve K is secured an arm, as O, to which is pivotally secured a link P, hav ing at its upper end a pin h. To the disk Z at the upper end of standard D is secured a link Q, having an elongated aperture or slot 70, in which the pin h is placed, the links overlapping each other. The piston may raise until the end of the slot engages the pin h, when the link P will raise the arm 0, and turn the valve a distance to shut off the inflow of water below the piston, and in going down the pin h will engage the upper end of the slot and depress the link P to rotate the valve a distance to stop the flow of water into the cylinder above the piston.

To drain the water from the pipes and cylinder and thereby prevent damage by frost or freezing, a pipeZ is provided to connect and form a passage from the cylinder to the pipe H, at the lower end portion of which is provided a pipe connection m with the wastepipe L. In the pipe m is provided a spigot n, to the handle of which is pivotally connected a rod p, projected through the base A, as shown in the drawings.

To free the cylinder of water, the pistonhead is passed to a point below the pipe Z, by which the water is substantially removed from the cylinder. The spigot 12 is then turned by the rod p to allow the water above the piston-head to flow out through the pipes Z, H, and m to the waste-pipe L, and thence to the discharge.

Referring to-Fig. 7, R represents a section of the back of the chair vertically through the center, and S the head'rest support. At the upper portion of the support and integral therewith is provided a hollow ball X, having a slot 1 extending over and through from y to y. A bolt 8 is passed up through the support S, the head to bridge the slot 0" and rest on the inside walls of the ball. A sleeve T, having a socket 1', semicircular in cross-seetion, adapted to the circumference of the ball, is passed over the bolt, as shown, and is provided with an offset sleeve U, at right angle with the sleeve T, and is cut out or slit at a from one end to the other, as shown more clearly in Fig. 8, and on the end of the bolt is turned a handle-nut WV. The pad-support A is provided with-a hollow ball B, similar to the described ball X, through which is passed a bolt (1, which is passed through a tube O,-on the end of which is a socket b, semicircular in cross-section and adapted to the surface of the ball B. The tube 0, with the bolt a therein, is passed through the split sleeve U, and a hand-nut 0 turned onto the end thereof, as shown. By the use of the handle-nut W, the sleeve T is clamped to the ball X and the sleeve U about the tube 0 to secure the parts in desired adjustment, and

to secure the pad in adjustment, the handnut c, on the bolt a, is turned against the end of the tube 0 to secure the ball B in the socket Z7, and thereby secure the pad in desired adjustment.

I claim- 1. The combination with a hollow base of a chair and a chair-body, of a cylinder secured within the hollow base, a stem secured to the chair-body and carrying at its lower end a tightly-fitting piston-head, said stem being of considerably less diameter than the cylinder to form a water-space between them, a water-supply pipe, branch pipes leading therefrom and communicating with the water-space in the cylinder near the ends thereof, a valve to direct the water to either end of the cylinder, and means for connecting the valve and stem and actuated by the movement of the chair-body to automatically stop the flow of water, said means comprising two members, one having a limited slidingmovement with respect to the other.

2. The combination in a head-rest for dental chairs of the support S, having a slotted hollow spherical portion X, the bolt 5 a sleeve T, having at one of its ends a socket If, semi circular in cross-section, a slotted cross-sleeve U, tube C, having at one of its ends a socket b, semicircular in cross-section, and adapted to a spherical portion of the cushion-frame, a bolt a and hand-nut c by which the cushion-frame may be secured in desired adjust ment and the hand-screw XV, whereby the sleeve T may be secured in desired adjustment on the spherical portion X, and the sleeve U clamped to the tube C to secure the rest in desired adjustment.

3. The combination with a chair body and base, of the cylinder B, a body-supporting stem and piston, a water-conducting pipe connecting the cylinder with a place of supply to actuate said piston and stem to raise and lower the chair-body, a valve to divert the flow of water, a link connection between the body-supporting stem and the valve to stop the flow of water, said connection consisting of two members sliding one upon the other and provided, the one with a slot and the other with a pin, the latter adapted to engage the end walls of the slot to operate the valve, substantially as described.

In testimony whereof I have hereunto set my hand this 6th day of June, A. D. 1893.





Referenced by
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US2578551 *Mar 5, 1948Dec 11, 1951Beloit Iron WorksSuction roll seal assembly
US3147946 *Oct 13, 1961Sep 8, 1964Vacudent Mfg CompanyUtility stool
US5467951 *Oct 21, 1993Nov 21, 1995Mdt CorporationBaseplate configuration
US20090080962 *Sep 24, 2008Mar 26, 20093M Innovative Properties CompanyWriting instrument with sheet dispenser
WO1995011406A1 *Oct 7, 1994Apr 27, 1995Mdt CorporationBaseplate configuration
Cooperative ClassificationA61G15/125