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Publication numberUS274223 A
Publication typeGrant
Publication dateMar 20, 1883
Filing dateJul 26, 1882
Publication numberUS 274223 A, US 274223A, US-A-274223, US274223 A, US274223A
InventorsEgbert S. Redman
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Adjustable bracket
US 274223 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)



SPECIFICATION forming;- pa rt of Letters Patent No. 274,223,,dated March 20, 1883. Application filed July so, 1882. (No model.)

.To all whom it mag concern:

Be it known that 1, ROBERT S. REDMAN, a citizen of the United States,residing at Newark, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Adjustable Brackets for Dental and other Purposes; and Ido hereby declare the following to be a fnll, clear, and exand myself, wherein a rod engaged with a toothed segment formed upon the end of one of the parallel arms. This device was defective, in that there was between each bite of the rod with a tooth a considerabletamount of play, amounting ordinarily to about an inch and a half, at the tablet, so that oftentimes said tablet could not be placed in the exact position desired, but the same would resta little above or below the desired point.

The object of this invention is to overcome the above objections, and at the same time to simplify and reduce the cost of construction.

Referring to the accompanying drawings, in which similar letters of reference indicate like parts in each of the several figures, Figure 1 is a side elevation of a bracket embodying my improvements, and Fig. 2 .is an enlarged sectional view of the same, clearly illustrating the internal arrangements of the several parts. Figs. 3 and 4 illustrate modified forms of the invention, involving the same principles, but varying in detail construction. In said drawings, a a are parallel arms,

hinged or pivoted at oneend to a swinging plate, 1), adapted to be secured to the wall or other surface, 0, by suitable means. The other ends aresimilarly hinged or pivoted to an extension-piece, d,which may carry or be construoted to carry a lamp, druggists bottles,

dentists tablet, or a second extension piece, 0, pivoted thereon, adapted to swine, laterally. The extension-piece is preferably cored out to receive the ends of the arms a a, as shown. The arm a is provided with a segmental extremity, f, and the extension-piece is constructed in such a manner as that a portion thereof will form a nearingsurface, between which and the extremity of the arm thejambpiece lies. Said jamh-piece is lettered t'in the drawings.- The'portion furnishing the bearing-surface may be cast integral with the extension-piece and be independent of the ti ngerpiece, as in Figs. 1 and 3, or it may form a pivotal center for the finger-piece, as well as a bearing-surface for the jambing portion there- 'of, as shown in Fig. 4. In the latter case the jamb-piece and finger-piece are in intimate combination, the same independent results bein g performed as when the parts are separated, all as will beobvious. Between the peripheral edge of the segment and bearing-surface is formed a recess or aperture adapted to receive a roller, 5, or jamb-piece, into which said jainbpiece is placed, substantially as shown in Figs. 1, 2, 3, and 4, its periphery engaging with the segment and eccentrita Downward. pressure brought to bear on the extension-piece 61 causes the segment to throw, roll, or jam the roller coming the weight of the extension-piece d and its burden.

The extension-piece may be elevated by simply raising the same by the hand; but should I desire to lower the same, it becomes necessary to provide suitable means for holding the jamb-piece out of engagement with the segment. This may be accomplished in several ways, some of which are illustrated-as, for example, the jamb-piece may be raised by means of a wedge, K, as shown in Figs. 1 and 2, or by a pivotal finger-piece, as shown in Fig. 3, or the said means may be integral with the jamb-piece.

The jamh-piece may fall between the eccentric and segment by its own weight, or may be forced therebetween by a spring, at, arranged insuitable bearings, the latter method being preferable, as it produces a more certain result.

or either of them, to increase friction, by which, however, I do not wish to be understood as forming a ratchet or cogged periphery, by which friction would be prevented.

I am aware that jamb-pieces have heretofore been used in connection with hinges for schoolfurniture, aud therefore this feature I do not wish to be understood as claiming broadly.

I am also aware that in United States Patent No.127,7il8 parallel arms fitQShOWilfWl'llCh are held into either adjustable or fixed relation by a thumb-screw. By partially screwing the said arms together necessary friction is given to support a considerable weight, in which condition the parts may be adjusted so that the extension -piece' may be brought to any exact position; but in this case, should the screw be adjusted to bring the parts so What I claim, and desire to have secured by Letters Patent, is

1. In combination, in an adjustable bracket, arms a a, wall-plate b, extension-piece d, bearing-surface g, segment f, jamb-piece i, spring m, and ayfiuger-piece, all arranged and operating substantially as and for the purposes herein set forth and shown.

2. In combination, in an adjustable bracket, arms a a, plate b, extension-piece d, provided with spring-socket and bearing-surface, segmental portion f, jamb-piece t, spring m, and

finger-piece adapted to raise said jamb-piece,

all arranged and combined substantially as herein set forth, for the purposes specified.

3. As an improved article of manufacture, an adjustable bracketcotn'oiningthereinawallplate, b, parallel arms a a, the latter of which is provided with a segmental portion, an extension-piece having said arms a a pivoted therein, and having a. bearing-surface, 9, therein, and ajatnb-piece, t', lying in a chamber in said extension-piece, said jamb-piece, bearingsurface, and arms being arranged in relation to the eXtension-pieceand adapted to cause said extension-piece to automatically resist downward pressure, and to allow an unobstructed elevation of the same, all as herein set forth and'shown.

In testimony thatIclaim the foregoing I have hereunto set my hand this 15th day of July, lssz. ROBERT S. REDMAN.



Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US6135404 *Nov 5, 1998Oct 24, 2000Weber Knapp CompanyKeyboard mounting mechanism
US6176456Nov 10, 1998Jan 23, 2001Weber Knapp CompanyKeyboard support mechanism
US7581791Jul 1, 2005Sep 1, 2009Humanscale CorporationErgonomic chair arm
US8104837Jul 16, 2008Jan 31, 2012Humanscale CorporationErgonomic chair arm
US9028001 *Sep 17, 2013May 12, 2015Steelcase Inc.Chair arm assembly
US20090015053 *Jul 16, 2008Jan 15, 2009Niels DiffrientErgonomic Chair Arm
US20140077567 *Sep 17, 2013Mar 20, 2014Steelcase Inc.Chair Arm Assembly
WO2006017065A2 *Jul 1, 2005Feb 16, 2006Humanscale CorpErgonomic chair arm
Cooperative ClassificationF16M11/04