US974289A - Hydraulic chair. - Google Patents

Description

E. MBLGHIOR.

HYDRAULIC CHAIR.

APPLIOATION rmm 111111122. 190s.

2 SHEETS-EHEET 1.

E. MELGHIOR.

HYDRAULIC CHAIR.

APPLwATIoN FILED JUNI: 22, 190s.

Patented Nov. 1,1910.

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EDWARD MELCI-IIOR, F CHICAGO, ILLINOIS.

HYDRAULIC CHAIR.

Specification of Letters Patent.

Patented Nov. 1, 1910.

Application led June 22, 1908. Serial No. 439,684.

To all whom it may concern:

Be it known that I, EDWARD MELOHIOR, a resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Hydraulic Chairs, of which the following is a full,

' clear, and exact description.

The invention relates to hydraulic chairs and more particularly to the mechanism for raising and lowering the chair and for controlling the adjustment of the back-rest or foot-rest. The mechanism is of the type adapted for chairs commonly known as barbers chair in which the seat may be raised or lowered by hydraulically operated mechanism and which comprises an adjustable back and foot-rest adapted to be adjusted into different positions for purposes well understood in the art.

The invention designs to provide improved hydraulically operated mechanism and improved means such as a lever for operating said mechanism and which may also be employed to control the'adjustment of the chair back and foot-rest.

The inventionfurther designs to provide an improved mechanism comprising a plunger in which a piston is adapted to travel to pump the fluid to raise the chair, which is constructed so that it can be manufactured at a low cost and will be eflicient in operation.

The invention further designs to provide an improved mechanism for controlling and locking the rod which controls the back and foot-rests.

s The invention still further designs to provide improved hydraulically-operated raising and lowering mechanism.

The invention consists in the several novel features hereinafter set forth and more particularly defined by claims at the conclusion hereof.

In the drawings: Figure l is a central vertical section through the improved mechanism. Fig. 2 is an elevation of the pumppiston, the operating-crank and connectingrod or pitman, parts bein' shown in section. Fig. 3 is a section taken on line 3-3 of Fig. l. Fig. t is a plan. Fig. 5 is a section on line 5-5 of Fig. 4, the pumppiston being omitted. Fig. 6 is a longitudinal section through the clamp for holding the reclining-ba-r in assigned position. Fig. 7 is a section on line 7-7 of Fig. 6.

Since the invention relates more particularly to the operating-mechanism for the chair it has not been deemed necessary to illustrate the base or the seat and several parts of the chair as these parts may be of any suitable construction and are well understood in the art.

A cylinder A is rigidly secured to the base or legs of the chair and fixedly sustained therein. The seat-bottom b is xedly secured to, and rests upon, a flange b at the upper end of a hollow plunger B, which fits and is adapted to travel in, the cylinder A, so that the chair-seat may be raised or lowered to the desired elevation. The cylinder A and the hollow lunger B are adapted to contain a suitable iquid, such as oil, which is adapted to be pumped into the cylinder beneath the hollow plunger to raise the latter and the chair supported thereby. A iston C is adapted to travel in the hol ow plunger B, to force the liquid beneath the head b of the plunger B. Plunger-head b3 is provided with a circular opening b4 which is normally closed by a check-valve b5 having a ribbed stem b guided in said opening. If desired, a spring bl beneath the check-valve and resting on a cross-bar bs secured to the lower face of the plunger-head, may be employed to normally hold the check-valve closed. Usually, however, the pressure of4 the liquid is sufficient for that urpose. When the chair is to be raised, liqui will be forced through the check-valve into the cylinder A and beneath the plunger-head. When the chair is to be lowered the checkvalve will be held open to ermit the fluid to pass through the check-va ve into the chamber in the plunger.

The piston C for forcing the liquid throu h the check-valve b5 is hollow and provic ed with a head c at its lower end, in which is formed an opening o through which the liquid may pass during the u stroke of the piston, into the chamber in the hollow piston C. This opening is normally closed by a check-valve c2 which is provided with a ribbed stem cs having at its upper end a terminal c* guided in a crossrib c5 of the plunger. A stop c limits the downward play of the check-valve c during the up-stroke of the piston.

When the piston is locked against longitudinal movement as illustrated in Fig. 1, the chamber C of the plunger and beneath the piston, is in communication with the chamber in the piston C, by means of an annular groove c? in the side of the piston which is connected to the piston-chamber by ports 08, and by-pass ports b in the bore of the plunger B. The purpose of these passages is to permit an initial lowering movement of the piston Without forcing liquid through. the check-valve o5 into the cylinder, so that the initial movement of the piston may be independently utilized to unlock the plunger before the piston is rendered operative. For the purpose of forming the bore of the plunger to truly guide the piston during this initial movement, the by-pass ports b are formed in the bore of the plunger B and a series of vertical ribs 512 having their inner faces corresponding to the bore of the plunger, are formed to extend vertically in the by-pass chamber. The circumferential by-pass is formed when casting the plunger and the ribs or guides 512 are formed inte- Oral with the wall of the plunger. Therefore, when the plunger is bored so that the piston will accurately lit therein, only one boring operation is necessary, as during the same operation the faces of the ribs are rendered concentric with the bore of the plunger and the necessity of re-boring the cylinder for the annular by-pass is avoided. The bore of the plunger is cylindrical above and below the by-pass ou so that the piston will travel truly in the bore of the plunger in all of its positions andthe annular groove 0T and ports 08 permit the liquid to pass into the chamber in the piston when the piston is in I' locked position. Thus, the piston is guided truly in all of its positions in the plunger and the construction is one which can be produced at a low cost.

Then the piston-head in its downward movement passes the lower end of the bypass o communication between the chamber in the plunger B and the chamber in the piston will be cut off so that continued lowering movement of the piston will force a portion of the liquid through the checkvalve b into the cylinder and correspondingly raise the plunger and chair sustained thereby. By repeating the pumping operation the chair may be raised to the desired elevation.

To lower the chair, the piston C is lowered, by mechanism hereinafter described, somewhat below its normal working stroke so that check-valve c2 will engage the stem of valve b5 and hold it open. Then the piston is lowered into such position, the oil will pass through a circumferential groove or by-pass Z213 formedin the bore of the plunger B, annular groove c7 and ports cs into the piston, thus Apermitting the liquid to flow out of the cylinder and the plunger to be correspondingly lowered.

Means for locking the plunger in the cylinder A against rotation as well as against vertical movement comprises a pair of wedge-blocks E having their outer surfaces adapted to engage the inner surface of the cylinder, A, and their inner surfaces inclined to be engaged by correspondingly inclined wedge-surfaces 011 on the piston C.

The wedO'es are 0'uided in the lunO'er and when the piston is raised above the normal pumping-stroke, wedge-surfaces c1l will engage the wedges to lock the plunger B and piston against movement in the cylinder.

The piston operating-mechanism comprises a shaft F journaled in the upper end of the plunger and provided with a crank j which is operatively connected to the piston, by means of a pitman G, being pivoted, as at glo to the crank and to the piston C as at gn. An operating-lever or crank F is secured to the shaft F at the side of the chair.

H denotes a rod which is suitably connected to the back and foot C of the chair (not shown) in manner well understood in the art, and by locking or securing the rod against longitudinal movement the rests may be correspondingly secured in assigned position. It is desirable to control these rests by the operating-lever for the raising and lowering mechanism. The rod H which will be referred to as the reclining-bar extends through the upper portion of the plunger B which is formed to receive the operating mechanism as well as the locking-means for the reclining-bar. It will be understood that the reclining-bar is movable longitudinally and by longitudinal adjustment thereof, the position of the foot-rest or the back-rest or both, may be varied. The reclining-bar H extends through a clamp I whereby it will be frictionally held and locked against longitudinal movement. This clamp comprises a pair of members z', i', respectively pivoted at their lower ends on a rod 2 so they may be swung laterally, and spring-pressed together by a pair of springs 3, each of which encircles a bolt 4 secured to one of the clamp-members and extending through the other. Each of the clamp-members is re` cessed as at 5 to receive the reclining-bar. Normally the clamp-members are pressed together to engage and secure the recliningbar by springs 3 and each is provided with an abutment 6 projecting upwardly from the body thereof and inclined so they may be spread apart to release the reclining-bar, against the force of springs 3, by an arm f* on the shaft F. Said arm is rigidly secured to the shaft and is adapted to engage the extensions 6 on the clamp-members to spread them so that the reclining-bar H will be released for adjustment.

It is desirable to control the clamp for the reclining-bar by the operating-lever for the pump without the use of intermediate mechanism and to control the clamp without releasing or unlocking plunger B. For this purpose, a spring connection is provided which permits the lever F and shaft F to be operated to control the clamp for the reclining-bar while the piston and plunger' remain locked. This spring-commotion is included in the pitman Gr which comprises an upper member' g, a lowerl member g, and a spring g2` interposed therebetween. The spring g2 is held in a cylindrical portion of pitmanmember' g and engages a screw-cap g connected to the upper end of said member through which the upper pitman-member g extends. The lower end of the member f/ is screw-threaded and provided with a nut g* whereby the tension of the spring may be adjusted. Preferably the lower end of the pitman member g is extended to engage as at g5 the lower pitman-member g so th-at during the down-stroke or pumping-stroke of the lever F the connection will be positive or rigid. When the parts are in position illustrated in Fig. l, the plunger will be locked against rotation and against vertical movement by the wedge-surfaces c engaging the wedge-blocks E and therefore the piston and pltman-member g will be secured against upward movement. The spring-connection, however, permits the shaft F and lever F to be independently operated to cause arm f* to release the clamp I for the reclining-bar without disturbing the locked relation of the lpiston C and plunger B. This releasing-movement of the clamp and independent movement of the lever F occurs while the lever moves from the position shown in full lines to that indicated in dotted lines at the left of Fig. l. The crank f is disposed to cross the dead center during this shift of the lever and so that no downward pressure will be exerted on the piston by the pitman. Thus, the spring-connection permits the operation of the lever F and shaft F to effect release of the clamp for the reclining-bar without releasing the plunger or shifting the piston.

Leakage sometimes occurs between the plunger and the piston. A recess a3 is formed at the upper end of the cylinder and a slot 615 is formed in the plunger so that the liquid in said recess may pass into the plun- The operation of the mechanism will be as follows: Assuming the parts to be in position illustrated in Fig. l and to be charged with a suitable liquid, the chair-seat will be locked against lowering movement and the reclining-bar H for the rests will also be locked. If it is desired to release the plunger B for rotation of the chair without raising or lowering the seat this may be done by shifting the lever F into the first position indicated by dotted lines to the right. This shift of the lever will cause the crank f to force the pitman g downward to lower the piston C and release wedges E. During this operation the piston will not operate to force any liquid through the plunger, the by-pass b permitting the liquid to flow into the plunger through ports c7 and c. During this shift of the lever, the arm f4 for operating bar will move away from the extension i and will not operate the clamp. If it is desired to raise the chair, the lever f will be oscillated substantially from the first position indicated to the right to a point above the horizontal position indicated by dotted lilies. During such strokes of the lever, a portion of the liquid in theV chamber C of the plunger will be forced through checkvalve b5 into the cylinder and beneath the plunger, thus correspondingly elevating it. lVhen it is desired to lower the chair-seat, lever E will be shifted into the substantially horizontal position indicated at the right of Fig. l, so that the check-valve o will engage the stem b of the check-valve b5 in the plunger' and liquid in the cylinder can pass through openings b4, passage b1, recess c7 and ports 0S into the piston. After any raising Vor lowering operation the lever F will be restored to position indicated in full lines, when the plunger and piston will be again locked. "When it is desired to adjust the back-rest or foot-rest, it is only necessary to shift the lever' F to the yleft which may be done without shifting the piston by reason of the spring-connection of the pitman G so that arm f4 will spread the members of clamp I laterally and release the reclining-bar. lVhen the lever has been thus shifted, the clamp will be held in released position so the reclining-bar may be adjusted as desired and when again restored to its normal position, the reclining-bar will be locked.

The invention is not to be understood as restricted to the details described and set forth since these may be modified within the scope of the appended claims without departing from the spirit and scope of the invention.

Having thus described the invention, what I claim as new and desire to secure by Letters Patent, is:

1. In a hydraulic chair, the combination of a cylinder, a plunger' movable therein, a piston for forcing fluid into said cylinder to elevate the plunger, valve-mechanism for controlling the flow to and from the cylinder, means securing the plunger against movement in the cylinder, a lever, recliningmechanism controlled by said lever, a connection between the piston and the lever for operating the piston in either direction, and yielding means interposed in said connection which permits the lever to be shifted in one direction when the plunger is secured against movement in the cylinder.

2. In a hydraulic chair, the combination the clamp for the reclining.

of a cylinder, a plungeiI movable therein, a piston in the plunger for forcing fluid into said cylinder to elevate the plunger, valvemechanism for controlling the flow to and from the cylinder, means securing the plunger against movement in the cylinder, a lever, reclining-mechanism controlled by said lever, a connection between the piston and the lever for operating the piston in either direction, and yielding-means interposed in said connection which permits the lever to be shifted in one direction when the plunger is secured against movement in the cylinder.

3. In a hydraulic chair, the combination of a cylinder, a plunger movable therein, a piston for forcing fluid into said cylinder to elevate the plunger, valve-mechanism for controlling the flow to and from the cylinder, means controlled by the piston for securing the plunger against movement in the cylinder, a lever, redining-mechanism control led by said lever, a` connection between the piston and the lever for operating the piston in either direction, and yielding-means interposed in said connection and which permits the lever to be shifted in one direction when the plunger' is secured against movement in the cylinder.

4. In a hydraulic chair, the combination of a cylinder, a plunger movable therein, a piston for forcing fluid into said cylinder' to elevate the plunger, valve-mechanism for controlling the flow to and from the cylinder, means for securing the plunger against movement in the cylinder, a lever, reclining mechanism controlled by said lever, a connection between the piston and the lever for operating' the piston in either direction, and a spring interposed in said connection which permits the lever to be shifted in one direction when the plunger is secured against movement in the cylinder.

5. In a hydraulic chair, the combination of a cylinder, a plunger movable therein, al piston for forcing fluid into said cylinder to elevate the plunger, valve-mechanism for controlling the flow to and from the cylinder, means controlled by the piston for securing the plunger against movement in the cylinder, a lever, reclining-mechanisin controlled by said lever, a connection between the piston and the lever for operating the piston in either direction, and a spring interposed in said connection and which permits the lever to be shifted in one direction when the plunger is secured against movement in the cylinder.

6. In a hydraulicl chair, the combination of a cylinder, a plunger movable therein, a piston for forcing fluid into said cylinder to elevate t-he plunger, valve-mechanism for controlling the flow to and from the cylinder, means for securing the plunger against movement in the cylinder, a lever, a connection between the piston and the lever for operating thel piston in either direction, yielding-means interposed in said connection which permits the lever to be shifted in one direction when the plunger is secured against movement in the cylinder, a reclining-bar, and means for securing the rechning-bar operated by said lever when the plunger is secured in the cylinder.

7. In a hydraulic chair, the combination of a cylinder, a plunger movable therein, a piston for forcing fluid into said cylinder to elevate the plunger, valve-mechanism for controlling the flow to and from the cylinder, means for securing the plunger against movement in the cylinder, a lever, a connection between the piston and the lever for` operating' the piston in either direction, a spring interposed in said connection which permits the lever to be shifted in one direction when the plunger is secured against movement in the cylinder, a reclining-bar, and means for securing the reclining-bar operated by said lever when the plunger is secured in the cylinder.

8. In a hydraulic chair, the combination of a cylinder, a plunger movable therein, a piston for forcing fluid into said cylinder to elevate the plunger, valve-mechanism for controlling the flow to and from the cylinder, means controlled by the piston for securing the plunger against movement in the cylinder, a lever, a connection between the piston and the lever for operating the piston in either direction, a spring interposed in said connection which permits the lever to be shifted in one direction when the plunger is secured against movement in the cylinder, a reclining-bar, and means for securing the reclining-bar operated by said lever when the plunger is secured in the cylinder.

9. In a hydraulic chair, the combination of a cylinder, a plunger movable therein, a piston for forcing fluid into said cylinder, to elevate the plunger, valve-mechanism for controlling' the flow to and from the cylinder, means for securing the plunger against movement in the cylinder, a lever, a connection between the piston and the lever for operating the piston in either direct-ion, a spring interposed in said connection which permits the lever to be shifted in one direction when the plunger is secured against movement in the cylinder, a reclining-bar, a spring-pressed clamp for the reclining-bar, and releasing-means for the clamp operable by said lever when the plunger is secured in the cylinder, the spring permitting the necessai-y movement of the lever to release the clamp.

l0. In a hydraulic chair, the combination of a cylinder, a plunger movable therein, a piston in said plunger for forcing fluid into said cylinder to elevate the plunger, valve mechanism for controlling the flow to and from the cylinder, means for securing the plunger against movement of the cylinder, a lever for operating the piston in either direction, reclining-mechanisni controlled by said lever and a connection between the piston and the lever comprising two slidably connected members, and a spring interposed therebetween.

11. In a hydraulic chair, the combination of a cylinder, a plunger movable therein, a piston in said plunger for forcing fluid into said cylinder to elevate the plunger, valvemechanism for controlling the flow to and from the cylinder, means for securing the plunger against movement in the cylinder, a lever for operating the piston in either direction, reclining-mechanism controlled by said lever and a connection between the piston and the lever comprising two slidably connected members and a spring interposed therebetween, said connection being constituted to operate the piston positively during the pumping stroke of the lever, and to yieldingly operate the piston during the reverse stroke and whereby the lever may be independently shifted while the piston and plunger are held stationary.

12. In a hydraulic chair, the combination of a cylinder, a plunger movable therein, a piston in said plunger for forcing fluid into said cylinder, to elevate the plunger, valvemechanism for controlling the flow to and from the cylinder, means for securing the plunger against movement in the cylinder, a lever for operating the piston in either direction, a connection between the piston and the lever comprising two slidably connected members and a spring interposed therebetween, a reclining bar, a clamp for the reclining-bar, and means for releasing the clamp operated by the lever, the spring permitting the lever to move independently of the piston when the latteris secured against movement to release said clamp.

13. In an adjustable chair having tilting parts, in combination, a cylinder, a piston operating in said cylinder, a shaft, a crank on said shaft, a connecting rod pivoted to said crank and connected by way of a yielding member with said piston, means for positively limiting the stroke of said piston, means for controllingl the tilting parts of the chair, and means whereby said controlling means may be actuated after said piston has come to rest.

14. In an adjustable chair having tilting parts, in combination, a hydraulic pump for raising the chair, an operating shaft, a crank on said shaft, a connecting rod between said shaft and said pump, said connecting rod being connected withsaid pump by a yielding member, controlling mechanism for the tilting parts of, the chair and means actuated against the tension of said yielding connection for operating said controlling means.

15. In an adjustable chair having tilting parts, in combination, a hydraulic pump for raising the chair, an operating shaft, a crank on said shaft, a connectin rod between said shaft and said pump, said connecting rod being connected with said pum by a yielding member, stop means for sai pump after the operation of which said yielding connection is affected, and means for controlling said tilting parts, said means being operated from said shaft after said pump has come to rest.

16. In an adjustable chair, an outer cylinder, a plunger cylinder operating in said outer cylinder, a piston operating in said plunger cylinder, a crank shaft, a yielding member connecting said crank shaft and said piston, and a pair of dogs lodged in said plunger cylinder for arresting the movement of said piston. i

17. In an adjustable chair, an outer cylinder, a plunger cylinder Yoperating in said outer cylinder, a piston operating in said plunger cylinder, said piston havin@ a tapered portion, a crank shaft, a yielding member connecting said crank shaft and said piston, and a pair of tapered dogs lodged in said plunger cylinder for engaging the tapered portion of said piston to arrest the movement thereof.

18. In a barber chair, the combination with a chair, of reciprocatory means for adjusting the height of the chair, means for limiting the extent of reciprocation of said chair adjusting means, an operating handle, a permanent connection between said handle and the chair adjusting means, a reclining lock, and an operative connection between said handle and said reclining lock whereby continued movementl of the handle beyond the limit of movement of the chair adjusting means will actuate said lock, such chair adjusting means being constructed and arranged to permit such continued movement.

19. In a barber chair, the combination with a chair, of means for adjusting the height of said chair, means for locking said chair adjusting means against movement, an operating shaft, a handle rigidly secured on said shaft, a reclining lock, and a permanent yielding connection between said shaft and the chair adjusting means whereby the shaft may be rotated to actuate the reclining lock when the chair adjusting means is locked aga-inst movement, substantially as described.

20. In a hydraulic chair, the combination of a chair body, means for adjusting the height of the chair, a rotation lock adapted to be operated by the chair adjusting means, an operating handle, a permanent connection between the handle and the chair ad- 'Listino' means a reclining lock` and an o 3- the chair means to lock said chair against b 7 C 1 7 Z3 erative connection between the reclining lock and the handle whereby continued movement of the handle beyond rotation lock set position will actuatesaid reclining lock, said chair adjusting means being constructed and arranged to permit such continued movement, substantially as described.

21. In a barber chair or the like, the combination of a chair, a plunger upon which the chair 'is mounted, means comprising a piston adapted to reciprocate within said plunger to raise and lower the chair, means carried by the piston for locking the chair against rotation and the piston against longitudinal movement in one direction, an operating shaft, a handle tiXedly secured on said shaft, a reclining lock, means carried by said shaft for actuating said lock, and a yielding' permanent connection between said shaft and the piston permitting' the shaftto be rotated to actuate the reclining lock when the piston is locked against longitudinal movement, substantially as described.

22. In a barber chair, the combination of a chair, means for adjusting the height of the chair, means to lock said chair against rotation, means to lock said chair in reclining position, and an operating handle permanently connected to said adjusting means and adapted to actuate the latter and said rotation and reclining locks, said parts being constructed and arranged to be actuated by movement of the operating handle in a single plane, substantially as described.

23. In a barber chair, t-he combination of a chair, means for adjusting the height of the chair, means to lock said chair against rotation, means to lock said chair in reclining' position, and an operating handle permanently and yieldingly connected to said adjusting means and adapted to actuate the latter and said rotation and reclining locks, substantially as described.

24. In a barber chair, the combination of a chair, means for adjusting the height of the chair, means to lock said chair in reclining position, and an operating handle, permanently connected to said adjusting means and adapted to actuate the latter and said reclining lock, said parts being constructed and arranged to be actuated by movement of the operating handle in a single plane, substantially as described.

25. In a barber chair, the combination of a chair, means for adjusting the height of the chair, means to lock said chair in reclining position, and an operating' handle yieldingly and permanently connected to said adjusting means and adapted to actuate the lat-ter and said reclining lock, substantially as described.

26. In a barber chair, the combination of a chair, means for adjusting' the height of rotation, means to lock said chair in .reclining position, and an operating handle permanently and yieldingly connected to said adjusting' means and adapted to actuate said rotation lock, said handle being also capable of operating said reclining lock when the chair is locked against rotation and without modifying the height adjustment of the chair, substantially as described.

27. In a barber chair or the like, the combination with a chair, of a plunger upon which the chair is mounted, a piston adapted to reciprocate within said plunger, to raise and lower the chair, means for limiting the movement of the piston, a reclining lock, a handle operatively connected to said reclining lock, and yielding means connecting said handle and piston for. permitting movement of the handle to actuate said reclining lock after the piston has reached the limit of its movement, substantially as described.

QS. In a barber chair or the like, the combination with a chair, of an operating' handle, a piston for raising and lowering the chair, a reclining lock normally retained in set position, connecting means between said handle and lock for releasing said lock when the handle is moved to one of its extreme positions, and yielding means connecting said piston and handle for permitting the handle to be moved to extreme position to release said reclining lock, and adapted to return said handle from such position immediately upon its release, substantially as described.

29. In a hydraulic chair, the combination of a cylinder, a plunger movable therein, a piston, valve-mechanisi'n, an operating-lever connected to operate said piston, a recliningbar, a clamp for holding the reclining-bar and through which the bar is longitudinally movable, and an arm shifted by the lever, the clamp comprising a member movable transversely to the direction of movement of the arm and shifted thereby to eifect release of the bar.

30. In a hydraulic chair, the combination of a cylinder, a plunger movable therein, a piston, valve-mechanism, an operating-lever connected to operate said piston, a recliningbar, a clamp for holding the reclining-bar and through which the bar is longitudinally movable, and an arm shifted by the lever, the clamp comprising a member movable transversely to the direction of movement of said arm and having an inclined abutment thereon which is engaged by the arm to shift said member to release the bar.

3l. In a hydraulic chair, the combination of a cylinder, a plunger movable therein, a piston, valve-mechanism, an operating-lever connected to operate said piston, a recliningbar, a clamp for holding the reclining-bar comprising two members between which the bar is longitudinally movable, one of'said members being movable with respect to the other, a spring for pressing said member laterally to engage the bar, and an arm movable with the lever for engaging said clampmember to release the bar said movable member being pivoted to swing transversely with respect to the direction of movement oli-said arm.

32. In a hydraulic chair, the combination of a cylinder, a plunger movable therein, a piston, valve-mechanism, an operating-lever connected to operate said piston, a rec ining bar, a clamp comprising a pair or' movable members between which the bar is movable longitudinally, and an arm on the lever for engaging the clamp to release the bar said members being movable transversely to the direction of movement of said arm.

33. In a. hydraulic chair, the combination of a cylinder, a plunger movable therein, a piston, valve-mechanism, an operating-lever connected to operate said iston, a recliningbar, a clamp or the reclining-bar comprising a pair of members each pivoted to move laterally, the reclining-bar extending between the members and an arm operated by the lever to engage both of said members to spread them to release the bar.

34. In a hydraulic chair, the combination of a cylinder, a plunger movable therein, a piston, valve-mechanism, an operating-lever connected to operate said piston, a rec 'ninrbar, a clamp comprising a pair of movabzle swing-pressed members between which the bar is movable longitudinally, and an arm on the lever for engaging the clamp to release the bar said members being mounted to be shifted by said arm transversely to the direction of movement of the arm.

35. In a hydraulic chair, the combination of a cylinder, a plunger movable therein, a piston, valve-mechanism, an operatin lever connected to operate said piston, a rec iningbar, a clamp for the reclming-bar comprising a pair of spring-pressed members each pivoted to move laterally, the reclining-bar extending between the members and an arm operated by the lever to engage both of said members to spread them to release the bar.

EDWARD MELoHIoE.

Witnesses LEONE S. RUSSELL, FRANK WV. BEMM.

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