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Publication numberUS429458 A
Publication typeGrant
Publication dateJun 3, 1890
Filing dateMay 16, 1889
Publication numberUS 429458 A, US 429458A, US-A-429458, US429458 A, US429458A
InventorsFelix Kraemer
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 429458 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

(No Model.) 2 Sheetsf-Sheet 1. P. KRABMER. PIANO STOOL. No. 429,458. Paten-ted June 3, 1890.

z sheets-'sheet 2.

(No Model.)





SPECIFICATION forming een ofreaevrs `rate-1ra No. 429,458,61215801 June 3,1890. A

Appleman ned May-16,1889. serial No. 311,081. (Nb model.)

T a/ZZ whom it 11i/tty concern:

Be it known that I, FELIX KRAEMER, ofthe city, county, and State of New York, a' citizen of the United States, have invented certain new and useful Improvements in'Piano- Stools, of which the following is a specification. Piano-stools with two seats, which are used by two persons for playing on the same piano-such as, forinstance, ateacher and a pu- Io pil-were used heretofore, in which the seats were supported on one-frame, both being vertically adjusted together by suitable mechanism. Neither one of the seats could be adjusted independently of the other, and the I5 child could not'be seated higher than the teacher, nor could the seats be moved sidewise on the frame, so as to give more room for the players.

The object of this invention is to furnish zo animproved double piano-stool in which-both seats can be vertically adjusted together and each seat singly, and in which the seats can be laterally moved away from or towardl each other; and the invention consists of a piano- 2 5 stool in which two laterally guided and slid-` ing seats are supported on a common frame. Each seat is independently adjustable in vertical direction by means of a central rackbar, which is engaged by a pinion on a square 3o spindle that passes through one side wall of the lower part of the seat, the inner end of the spindle being acted upon by a spring, which forces the squared portion of the spindle into a square recess of a socket-platev of 3 5 the seat-frame, so as to lock the rack-bar and seat at any suitable height.

In the accompanying drawings, Figure l represents a front elevation of my improved double piano-stool, showing the seats in their 4o normal position sidewise of each other. Fig.-

2 is a plan of the stool with the seats moved sidewise on the supporting-frame. Fig. 3 is a vertical transverse section on line m fr, Fig. l. Fig. 4 is a front elevation showing the seats moved away from each other, one of them raised above the other. Fig. 5 is a vertical section of one of the seats drawn on a larger scale, and showing the adjusting mechanism of the seat; and Fig. 6 is a horizontal 5o section on line 'y y, Fig. 5.

upper seat part proper B2. The latter is guided the top, part A of the frame A are supported two seats B B, which are guided by longitudinal dovetailed cleats b in corresponding `grooves h oi' the top part A', so as to be adjusted in lateral direction away from each other, as shown in Fig. 2. When the seats BB are thus supported, they are to be used for two persons-such as a teacher and his hpupil-onby two persons who play duets on the piano.

When only one person desires to sit on the stool, the seats are moved toward each other suntilthey abut, wheny the stool is like an ordinary piano-stool.

-' Each seat B is made of a lower part B and an I 7o 1n the lower part by a central rack-bar C,

Vwhich is rigidly attached to the bottom of the seat'Bg, and is guided in an opening in the bottom of the lower seat-frame B and in a longitudinal slot a of the top A of the supporting-frame. The rack-bar C is engaged by a pinion d, which is attached to a spindle D, that passes through a hole in the outer side wall of the lower seat-frame B', the outer end of which spindle is provided with a knob D. The ends of the spindle D are rounded to turn in suitable bearings, While the intermediate part of the spindle is made square, so as to engage a socket-plate d2, attached to the inner surface of the outer side wall ofthe seat-frame B,which socket-plateis provided Withasquare recess t0 receive the square inner part of the spindle D. The opposite end of the spindle is supported in suitable bearings @and acted upon by a strong spiral spring e2, which latter serves to keep the square part of the spindle D in the square opening of the socketplate cl2, so as to keep thereby the spindle D, rack-bar C, and the seat B2 in locked position. Vhen it is desired to raise or lower the seat, the spindle D is pushed inward against the tension of the spring e2 until the square part clears the socket-plate cl2 and permits the turning of the spindle D on its axis, so Y that the pinion d, which meshes with the rack Ioo on the rack-bar C, raises or lowers thereby the seat B2. As soon as the pressure on the knob D is released the spring e2 forces the spindle lengthwise and into re-engagement with the socket-plate (Z2, thus locking it and the seat in place. The pinion cl has to be of sufficient width to provide for the shifting of the spindle and still remain in mesh with the rackbar C. By the independent adjustment of each seat B eitherseat can be adjusted to any suitable height as required by the persons occupying the same. After use the seats are lowered by pushing the spindle inward and turning the same until the seat arrives upon the lower seat-frame B', when the entire seat is moved inwardly on the top part A until the seats abut against each other.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. The combination, with a supportingframe the top part or platform of which has longitudinal guide-grooves, of two laterallysliding seats moving in said grooves and being vertically adjustable independently of each other, substantially as set forth.

2. The combination, with a supportingframe having a top part with dovetailed guidegrooves, of two laterally-sliding seats, each seat being composed of a lower section anda vertically-adjustable seat-section, substantially as set forth.

3. The combination, with a supportingframe having a top part with dovetailed guidegrooves, of laterally-slidin g seats having cleats guided in said grooves, each seat being composed of a lower section and an upper seatsection, and means for raising or lowering the seat-section, substantially as set forth.

4. The combination, with a supportingframe having a longitudinally-slotted top part, of two laterally-sliding seats guided by cleats in grooves of said top part, each section being formed of a lower section and an upper seatsection, rack-bars attached to the upper seatsections, spindles provided with pinions meshing with said rack-bars, and means for locking said spindles and rack-bars after the upper seat-sections are adjusted, substantially as set forth.

5. The combination, with a supportingframe havinga longitudinally-slotted top part, of a laterally-adj ustable seat, means for effecting thelateral adjustment of the seat, the seat being formed of a lower section and of a vertically-adj ustable seat-section, a central rackbarattached to said seat-section and guided in t-he slot of the top part, a spindle having a pinion meshing with said rack-bar, a spring pressing on the inner end of the spindle, and a socket-plate in the lower seat-section having a square recess for engaging a squared part of the spindle and locking the saine in position, substantially as set forth.

In testimony that I claim the foregoing as my invention I have signed my name in presence of two subscribing witnesses.



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US20040094076 *Jul 10, 2003May 20, 2004Ju-Young JinFolding table
US20040187749 *Sep 24, 2003Sep 30, 2004Chen ZhurongFolding table
US20050005826 *May 10, 2004Jan 13, 2005Strong L. CurtisPortable folding table with locking hinge
US20050241550 *Apr 22, 2005Nov 3, 2005Martin NeunzertRetainer for securing a table in a folded position
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US20060288918 *Aug 28, 2006Dec 28, 2006Strong L CPortable folding table
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