US1116515A - Barber's chair. - Google Patents

Description

A. L. UNDELAND.

BARBER/3' CHAIR. APPLICATION FILED NOV. 22, 1912.

Patented Nov. 10, 1914.

3 SHEETS-SHEET 1 Andrew L Unde an d r awuamkq @M a 6M A. L. UNDELAND.

BARBERS OHAIR.

APPLICATION FILED NOV. 22, 1912.

A. L. UNDELAND.

BARBERS CHAIR.

APPLICATION FILED NOV. 22, 1912 1 1 515 Patented Nov. 10, 1914.

a SHEETS-SHEET 3.

Andrew L. Undeland.

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ANDRE? L UNDELAND, OF OMAHA, NEBRASKA.

BARBEBS CHAIR.

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Appfioation filed November .Eipeoification of Letters Patent.

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Serial No. 733.015.

Be it known that T, .iirinnnw L. llIZDE- LAND, a citizen of the United States, and a resident ot (,lmaha, in the county of Douglas ant State of Nebraska, have invented certain. new and useful lm jn'ovements in lfiarbers Chairs, of which the lollmving is a specification.

My invention relates to chairs of the class employed by harbors, dentists, etc. and particularly to those in which the raising and lowering of the chair are coi'itrolled by hydraulic pressure.

It is the object of iny'invcni'iim to provide a simple, durable and relatively inexpensive mechanism for operating such chairs, the mechanism being such that the raising, lowering revolving und'reclining may all be controlled by'a sii'igle operating lever.

Constructions embodying my invention are illustrated in the accompanying drawings, in whichliigure 1 is a side view oi? a chair proviifled with the improved mechanism a portion of the scat-base being broken away to show the. recline-clamp, Fig. 2 is a vertical sectional view of the operating inechanisunthe section being transverse to the operatingshaft, Fig. is a vertical section through the axis oi. the operatingshailt, Fig. i is a detail section in the same plane as Fig. 3, Fig. 5 is a detail section in the same plane as Fig. 2 Fig. 6 is a detail side view of "the recline-clamp, Fig. 7 is an end view of the same, Fig. 8 a section thereof on the axis oi? the lock-rod, Fin. 9 is a detail of one of the parts of the clamp, Fig. 10 is a detail section of the pump-piston and a part of the 'ilunger, the parts being in the same position as in 4 but the plane of section being at right angles thereto, Fig. '11 is a horizontal section of the plunger at the locking-plug, and Fig. 12 is a horizontal. section of the piston-and plunger, on the plane of the lines m-m of i and 10. y

The chair illustrated in Fig. 1 is of the type ordinarily used by barber's, and has a suitablebase 1 with a column 2 inclosingthe hydraulic cylinder which is movable vertically and rotatably -within the cylinder, supports the chair-seat 5, To the seat frame are pivotally connected the back 6 and foot-apron 7, and these are pivotally connected with opposltc ends of the arm-rests 8, so that in recliningthe chair they move simultaneously toward 1 The plunger 4-, i

a. horizontal position. The recline lock-rod 9 is pivotally connected with the footnpron, as shown, and extends rearwardly through a clamping device disposed at the side of he plunger-head 10 and carried on the endportion otthc crank-shaft 11. The crankshaft is rotatably mounted in the plungerhead, and at the end opposite the clamping device arries the operating-lever 1:2. On "the central part of the shaft is secured a crank 13, and a connecting-rod it extends :trom the cranl'epin down through the plunger and is pivotally connected with the slotted head 15 of the pump pistoirrod 16. The piston 17 fits slidably within the bore of the plunger and is fixedly secured upon the ]).il-;il()11l0tl, being held against a shoulder thereon by means of a nut 18 screwed upon the reduced portion of the rod. portion oi 'the piston-rod between the piston and the rod-head 15 passes slidably through a cylindrical body 19 which [its slidably within the bore of the plunger and serves as a guide for the piston-rod, as well as for certain other purposes to be hereinafter de scribed. A. pin 20 secured to the piston extends up through the body 19 and servesto prevent rotation thereof about the piston rod, while" permitting}; relative longitudinal movement of said parts. The piston has sevoral vertical ports through it, which are normally closed by the plate-valve 21 the latter being held yieldably against the bottom of the piston by means of springs 22 placed around studs 23 which are secured to the piston and extend through openings in the va1veplate, as shown in Fig. 1-. Upon the bottom of the plunger is secured a head 24 which has an opening therein normally closed by a valve The valveis pushed yieldingly upward by a spring 26 of which arranged as shown, tlie valve having a downwardly extending; stem thereon which passes crossbar.

lVhen the parts are in the positions shown in Fig. 2 the piston is at its highest position relative to the plunger. and the operatinglever is at its extreme forward position, or so that the center-line of the lever is on the dotted line a of said 2. From this position the lever may be moved rearwardly, past the positions 7), 0, (Z and o to the extrenie rearward position f, at which the piston will. be at its lowest position relative to The the lower end bears against a. cross-bar 27,

through the spring and is guided in the proaching the latter position a pin integral with the pistmi-rol and entending bethe clamping device or recline-lock to permit the chair to be tilted to various posi tions.

In the side of th: plunger is a radial lugs. On the upper clamp-part 36 is an low the nut 18, engaees the, valve 5 and cylindrical opening iii which is slidably dispushes it downward tlii'ztlllwt the spring 26 posed a cylindrical plug 33 of which the so that the valve held open, At about the outer end is rounded so as to lit against thev same time that the valve begins to be opened wall of the cylinder 3, and its inner end is the upper edge of the pist n passes below beveled or inclined toward the lower ide the upper end of a bypass groove 99 formed The plug is retained in position by means in the wall of the plunger near the head Ql. of a circular spring B l which lies in a cir- When in this no. tion the liquid in the cylcumferential groove in the outer surface of indcr .5 may pass through the valve J) into the plunger, and of which the ends enter rethe plan; er below the piston, thence through cesses in the sides of the plug. as shown in the b pa s groove and above the piston, Fig. 11. On the side of the body 19, and at thence through one otl'two transverse ports a position thereon coincident circumferen- 30 in the. body 19, and upward through one tially with the plug, is a beveled face 35 of two vertical ports Si termed in said body which is adapted to fit against the beveled and connecting with the ports 30, as shown inner end of the plug Then the operin Fig. 10. A pas; being thus completed ating-lever moved to the extreine forward from the cylinder to the interior of the plunposition a, and the piston thus raised to its ger above the pisirn, the weight of the chair highest position relative to the plunger, the may force the plunger down into the cylinsaid beveled t'ace engages the plug and der until the plunger-head engages the seat forces it outwardly so that it presses agaihst therefor at the top of the cylinder, as shown the side of the cylinder 3. The plunger at in Fig. 3. 'When the operating-lever is moved tie same time is pressed against the opposite 9 forwardly beyond the position 0 the piston side of the cylinder and is thus securely is raised toaposition such that the upperedge held against rotation the-rein. After the thereof is above the by-pass groove 29, and body 19 has been-raised to a position such the pin 28 passes out of engagement with the that it will operate the plug 33, it will tend valve 25, allowing the valve to close. Conto remain in said position on account of the tinned upward moven'ient of the piston then frictional engagement between it and the causes the plate-valve- 21 to open and the walls of the plunger and'end of tilt plug. liquidv in the upper part of the plunger to However, when the operatingdever. moved pass down through the ports 31 in the body rearwardly to the position 0 the piston and 19, and through the valve-ports into the piston-rod are moved downwardly to the space below the piston. Downward moveposition shown in Fig. at which the head ment of the piston will then force the liquid 15 of, the piston-rod engages the body 19 through the valve 25 into the cylinder 3 and by pressing the same downwardly re1 below the plunger so that the plunger will leases it from engagement with the lock- 1 be thereby forced upwardly in the'cylinder. plug. Thus, movement of the lever to the- The chair is thus elevated by oscillating the position (rcauses the plunger to be locked operating-lever between the positions (Z and and held against rotation in the cylinder,

6 shown in Fig. 2, and is lowered by moving and after being locked the same is retained the lever rearwardly beyond the position a. as longas the lever is not moved rearwardly YVhen the lever is at the position (Z the piston beyond the position a. is at the position shown in Fig. 5 and the lhe clamping device for the recline lock lower edge thereof passes above the lower rod is shown in detail in Figs. 6 to 9, incluedge of the ports 32 which are formed in the sive'. The clamp device has an upper part sides of the plunger-and coincide circumfer- 36 and a lower part 37 which fit around the entially with the ports 30 in the body 19. respective sides of the rod 9, and are pivot- During any movement of the piston above ally connected with each other by a pin 38 the position shown in Fig. 5, the said ports extending parallel to the rod. At the side 32 and the ports 30 and 131 form a by-pass opposite the pivot-pin studs are around the piston, so that no pumping acscrewed into lugs on the lower part 37 and tion can occur. Thus the movement of the extend upward through corresponding lugs operating lever in either direction between on, the upper part 36. Helical springs l0 are the positions (Z and a will neither raise nor disposed around said studsbeing normally lower the chair, and such movement may be under compression and pulling the clamp designated as the dead-stroke or the lever parts toward each other so that they fricand piston, with reference to the pumping tionally'engage and clamp the rod 9. Lugs action. The said dead-stroke of the operatd1, integral with the lower clamp part 37, ing-lever is utilizedfor locking the plunger extend upwardly therefrom on opposite to prevent rotation thereof in the cylinder, sidesof the rod 9, and the shaft 11 passes for releasing the same, and for releasing 'revolubly through the upper parts of said arch-portion 42 .which straddles the shaft 11 between the lugs ell. 'lhrough the upper end of said arch-portion is passed an adjustingscrew 4-3 provided with a loclenut it, and of which the lower end is rounded and engages the rocking-block 45. The rocking-block is retained Within the H1'Cll-}')01tl()fl 42 by means of a pin 4.6, which passes loosely through a transverse opening in the block, and of which the ends are secured in the arch. The

block is normally pushed toward one side shaft corresponding to movement of the.

operating-hwer between the positions Z) and f, the rocking-block is not moved, but the lever is moved forwardly at about the position I) the higher part of the cam-surface engages the rocking-block and rolls it toward the opposite side of the .arch from its normal position. At the same time the block is slightly raised and spreads the clamp-.

parts 36 and 37 by pressing upwardly on the arch-portion of the part 36 while the shaft presses downwardly on the part 37. A very slight spreading of the clamp-parts is suflicient to enable the rod 9 to slide through them and the inclination of the chair to be varied. The exact positionoi the operating lever at which the clamp will be released 'aries somewhat, owing to the variation in the position of the rod 9 relative to the shaft 11, as will be apparent by reference to the dotted lines in- Fig. 1. The rolling movement of the block 4-5 reduces to a minimum the wear of the cam surface on the shaft, and by adjustment of the screw 43 any Weinmay be compensated or vthe parts adjusted so that the spreading of the clamp will be properly timed with relation to the move ment of the shaft.

From the foregoing it will be obvious that the entire-control of the chair movements may be readily effected by means of the one operating-lever and without the use of other rods, catches or releasing devices. The chair may be raised or lowered to the desired height, then rotated tothe desired position and secured in said position by pushing the lever forward to the extreme position. At the same time that the chair is locked against rotation the recline-clamp is released and the chair may be inclined to the proper or de sired position. The lever is then moved rearwardly to permit the closing of the re cline-clamp and the chair will then be held in .the desired position. until the lever is again moved. Should it be desired to again change the inclination of the chair without releasing ittor rotatiom-thc same may be The lower side of thedone by again pushing the lever forward.

Should it be desired to rotate the chair without changing the inclination or the height thereof, the lever is moved rearwardly to the position 0 so as to release the loclz plug, the chair then turned to the desired position, the lever pushed flt'orward liar enough to again opera to the rotation-loclr, and then returned to a position anywhere between F) and a. It should be noted that before any elevation or lowering of theehair can he cllected it is necessary that the recline-clamp he per mitted to operate and that the rotation-loch he released. l't is thus impossible to de'lace the inner surliace oi the cylinder by forcibly raising or lowering the plunger while the locking-plug is held in engagement with the cylinder wall.

New, ha vin g described my invention, what I claim and desire to secure by .Letters Pat cut is: i l

1. In a. chair of the class described, a cyl-- inder, a. hollow plunger movable vertically and rotatably therein, a pui'np-piston reciprocatahle within the plunger and adapted to force lluid from the plunger into the cylinder, there'being a bypass to permit fluid to pass around the piston during part of its stroke, a locking-plug disposed in the plunger and engageable with the cylinder to prevent rotation of the plunger therein, and a body fitting slidably within the plunger adjoining the piston and actuated by the piston during its movementadjacent to the bypass for moving the locking-plug into engagement with the cylinder and releasing it therefrom.

2. ln a chair of the class described, a cylinder, a plunger movable vertically and rotatably therein, a pump-piston reciprocatable within the plunger, a body vertically slidable within the plunger adjacent to the piston and actuated by movement of the piston beyond predetermined limits, and a plug actuatable by said body to hold the plunger against rotation within the cylinder.

3. In a chair of the class described, a cylinder, a hollow plunger movable vertically and rotatably therein, a plug extending and movable radially through the wall of the plunger, an annular flexible retaining member having its ends engaging the plug and lying within a groove extending around the plunger, and means for moving the plug outwardly to engage it with the cylinder.

4. In a chair of the class described, a cyl inder, a'hollow plunger movable vertically and rotatably therein, a pump-piston movable within the plunger, an operating shaft connected with the piston for reciprocating the same, a body slidably connected with the piston and fitting within the plunger adjacent thereto, a plug movable radially of the plunger to engage the cylinder and lock the plunger therein, the said slidable body being engageable with the plug to actuate the same, the body being actuated by movement of the piston beyond predetermined limits, a recline locking device, and means on the operating shaft for releasing said device when the shaft turned so as to move the piston and the slidable body to engage the latter with the plug,

5. lira chair of the class described, a cylinder, a plunger movable vertically and rotatably therein, a piston slidably disposed ithin the plunger, a piston-rod secured to said piston, a guide-body fitting slidably within the plunger adjacent to the piston and around the piston-rod, there being abutinents carried by the piston-rod to limit relative movement of the piston and said guide body, a crankshaft carried on the plunger and connected with the piston rod, valves arranged on the piston and in the end of the plunger to control the passage of fluids through the same, whereby reciprocation of the piston will force fluid from within the plunger above the piston into the cylinder below the plunger, means on the piston for holding open the valve in the plunger, means forming a by-pas's around the piston at each end of its stroke, means actuated by the guide-body for holding the plunger against rotation within the cylinder, a re cline lock device, and means on the crankshaft for releasing said device.

6. In a chair of the class described, the combination with a cylinder, a plunger fitting slidably and rotatably therein, a piston fitting within the plunger, a crank-shaft connected with the piston, valves carried by the piston and plungervand controllable by pistenmovements to raise and lower the plunger in the cylinder, a recline-lock, and

means on the crank-shaft for releasing said lock, of a guide-body fitting slidably Within the bore of the plunger adjoining the piston,

a plug extending through the wall of the plunger'and actuatab'le by said guide-body to engage the cylinder and prevent rotation of the plunger therein, and means including the piston engageable with said guide-body to move it into and out-of engagement with the plug, said means being arranged to per init free movement of the piston and crankshaft past the reclinelock-release position while the guide-body is in engagement with the plug,

7. In a chair of the class described, the combination with a cylinder, a plunger working therein, a piston working in the plunger, operating means for moving the piston relatively to the plunger, means controlled by piston-movements for raising and lowering the plunger in the cylinder, and means enabling a dead-stroke of the piston wherein the movements thereof will not aifect the relation of the plunger and cylinden of a locking-plug carried by the plunger and engagable with the cylinder to prevent relative rotation of the plunger and cy1- inder, a plug-actuating member slidable in the plunger, and-means connecting-said member in a limited slidable relation to the piston, so that said member will be moved to locking position by movement of the piston to one limit of its dead-stroke, will remain fixed at said locking position during subsequent movements of the piston intermediate of the limits of the dead-stroke, and will be released from said locking position only by movement of the piston to the other limit of its dead-stroke. I

In testimony whereof I have hereunto subscribed my name in the presence of two witnesses.

ANDREW L. UNDELAND. Witnesses:

D. O. BARNELL, A.. R. MITCHELL.

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