US1037140A - Adjustable knockdown book-support. - Google Patents

Description

G. B. FRENCH. ADJUSTABLE KNOGKDOWN BOOK SUPPORT.

APPLICATION FILED'MAB. 19l 11.912.`

1,037, 140,. Patented Aug. 27, 1912.

, UNITED, srarns Parnu-r onirica. A

CHARLES B; FRENCH, OF TONGAOXIE, KANSAS.

ADJUSTABLE ,KNOCKDOVVN BOOK-SUEPORT.

Specification of Letters Patent.

Patented Aug. 27,.,1912.

Application lfiled March 19, 1912. Serial No. 684,670.

To all whom t may cor'wem Beit known that I, CHA-anne B. FMNCH, a citizen of the United States, residing at Tonganoxie, in the county of Leavenworth and State of Kansas, have invented certain new and useful Improvements in Adjustable .Knockdown Book-Supporters, or' which the following is a specification.

My invention relates to improvements in adjustable knockdown book supporters, and one of my objects is te produce. a simple and inexpensive device ot' this character, which may be adjusted forward or backward and yupward or downward to suit the convenience of the reader.

A further object is to provide a device of this character which may be readily at- ;tached to the arm or seat of a chair, or the side of al cot, and which may be knocked down `into compact form when not in use.

Other objects or" the invention will hereinafter appear, and in order that said invention may be fully understood, reference will now be made to the accompanying drawing, in which:

Figure 1 is a rear elevation of the device set up ready for use. Fig. 2 lis a side elevation of the device. Fig. 3 is a section of a nut 7.

book holder', forming part of the device, ou line IH-IH of F ig. 1. Fig. 4 isa horizontal section on line IV-IV of Fig. 2. Fig. 5 isa section on line VV of F 3. Fig. 6 is a plan view of the book holder.

In carryingout the invention, l employ a clamp 1, which may be readily secured to any suitable support 2, for instance, such as the'arm or seat of a. chair, or the side of a cot, and said clamp comprises a yoke 3, a set-screw 4, and a horizontal slideway 5, provided with a bolt 6 having a thumb- Bolt (i has a rectangular head y,countersunk in the rear side of slideway 5,

Vnut 'i' and the adjacent side of arm 9, to

protect the latter 'from being marred when said thumb-nut 7 is screwed up to lock the armi) at any point of its adjustment 1n the slideway .5.

412 designates a vertically-arranged slideif "16 designates a vertically-extending armv adjustabljmounted in the slideway 12 and having a longitudinal slot 17, through which bolt 13 entends, said bolt Ahaving a rectangular washer 18 interposed between nut 15 and the adjacent side of arm 1G to prevent the same from being marred when the nut is screwed upon the bolt to lock slideway 12 from adjustment longitudinally of arm-), or arm 1G from vertical adjustment in said slideway. The upper end of arm 16 has an integral boss 19 with a vertically-extending pintle 20 upon which a horizontal arm 21 is swiveled, said arm having' a lug 22 adapted to enter a corresponding notch23 in the upper portion of boss 19.

Arm 21 normally extends at a right angle to arm 15), but owing` to the inclined side 2l of lug 22, it may be swung' backward out of the way 'of the reader when t-he latter desires to rise from the chair or cot, to which the. device is attached. Said arm 21, how*I ever. cannot swing forward beyond its normal position, owing to the abrupt shoulder 25 of lug 22, striking the corresponding wall ot the notch 23. This feature is especially desirable when the device is attached to a rocking-chair, as backward movement of the latter cannot cause the arm 21 to swing for.- ward on its pivot. against the reader.

Arm 21 has a longitudinal slot 26 to ree ceive the threaded stud 27 of a plate 28, provided with a. vfinger 2%), pivotally secured at one end to said plate and provided at its opposite end with a T-shaped terminal 30, adapted to engage any of the key-hole slots 31 in a sheath S2, secured to the rear-side of a book-holder 38.

Book-holder may be adjusted to any desired pitch or inclination by swinging the inger 29 on its pivot, and locked at any point of its adjustment by a stud 34 and a thumb-nut 35, which latter engages the former and one side of plate 28,. which has a segmental slot 36, through which stud 34 projects. Stud 27 is provided with a thumbnut 27a adapted to bear against one side of arm 21 to lock said stud atanypoint of its adjustment in slot 26.

Book-holder 33 is collapsible so that it may be folded into compact form, and cornprises a back-plate 37, links 38, pivotally secured at their inner ends to said backplate, and connecting-bars 39 pi'votally-connesting the outer ends of'said links, thc lower pair of which have flanges 40 extending at right angles thereto to preventa book or sheet of music sliding oft' the holder. Links 38 are free to fold upward on their pivotal connection with back-plate 37, but cannot swing below a horizontal position owing to a pair of stops 1-1 projecting from the back-plate into the path of the inner ends of the-two lowerinost links 3S.

Operation: When it is desired to adjust the holder 33 toward or away from the reader, nut 7 is loosened so that arm 9 may 'be slid in the desired direction in the slideadjustment is had by loosening nut 15 and sliding arm 16 upward or downward in the slideway 12. Book holder 33 may be adjusted longitudinally of arm 2l to bring it directly in front of the reader by loosening the thumb-nut 27, and further Vertical adjustment of said book holder 33 may be had through the intermediacy of the Tshaped terminal 30 and the key-hole slots 31.

The Vdevice maybe readily -placed in knockdown form by releasing the various thumb-nuts and disconnecting the arms from each other and their respective slideways.

Having thus described my invention what I claim and desire to secure by Letters Patent. is:

In a device of the character described, a

suitably-supported horizontalv arm having a in the presence of two witnesses.

CHARLES B. FRENCH.

Witnesses A Josnrir E. bl'risnns, WILLIAM M runs.

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