US459134A

US459134A - Arm-support

Info

Publication number: US459134A
Authority: US
Publication date: 1891-09-08
Anticipated expiration: 1908-09-08

Description

R. J. DAVIS.

ARM SUPPORT.

(No Model.)

Pateted Sept. 8, 1891.

mummmmmm :as cv., Puma-uma.. msnm UNITED STATES PATENT OEEICE.

ROBERT J. DAVIS, OF CHICAGO, ILLINOIS.

ARM-SUPPORT.

SPECIFICATION forming part of Letters Patent No. 459,134, dated September 8, 1891. Application led March 30, 1891. Serial No. 386,948. (No modehl To all whom it 17m/,y concern:

Be it known that I, ROBERT J. DAVIS, a citizen of the United States, residing at Chicago, in the county of Cool; and State of Illinois, have invented a new and usefulImprovement in Arm-Supports, of which the following is a specification.

My invention relates to improvement in supports for the use of book-keepers and others, while writing in account-books and other books ot' large size to steady the hand and relieve the shoulder from the weight of the raised forearm while writing at the lower ends of pages. Hy object is to provide an armsupport of the above class and of an improved construction which will render it particularly convenient and desirable for its purpose.

In the drawings, Figure l is a perspective view of my improved device, illustrating the way of applying it to a book; and Figs. 2 and 3, broken and enlarged perspective views of parts of the device, showing their preferred construction.

A is a supportingbar provided at one end with a rod B, which extends from an edge of the supportingbar at a right angle thereto. At the opposite end of the su pporting-bar and extending parallel with the rod B is a supporting-blade t. A plate s, Iianged to a right angle along one edge, is pivoted at about the center of its flange to the edge of the supporting-bar A, adjacent to the rod B. The plate is provided in its free edge with a recess s. At the end of the bar A where it is provided with the blade t are secured bearing-plates fr, which project beyond the edge of the bar A opposite the blade t. Pivotally secured to the plates r,between the latter, is a swinging supporting bar C, provided centrally with a longitudinal guide-slot q. D is a sliding block formed of two similar parts p and p on opposite sides of the bar C and held in fixed relation by a central pin o, which passes through the parts p p and loosely through the guideslot q. At opposite ends of the sliding block D are pins n, which may pass through both parts p and p and should extend, as shown, beyond the opposite faces of the block.

To place the device in operative position upon an open book, the rod B is inserted into the opening between the bound edges of the leaves and back of the book, and the plate s may be caused to rest upon the faces of the open pages', or it may be inserted at its ends between leaves, the recess s receiving the edges of the leaves. The bar A may be swung upon the pivot thus afforded by the rod B to extend along the lower edges of the pages at the right or left ltand side ofthe book, whereby either the part p or p of the sliding` block may be uppermost, and the blade t is inserted between leaves of the bool; to steady the bar A in its adjusted position.

In operation the writer rests his forearm upon the block D between the pins n, and owing to the pivotal connection of the bar C with the bar A and the facility with which the block D slides upon the bar C the writer may move his hand, while writing, in any direction without obstruction. IIe is thus able while resting his arm to move his hand freely across the bottom of the page and without hinderance to his writi ng. The bar C may be swung around to extend with the block D beyond the side edge of the book, whereby the device will be out of the way while not in use and need not therefore be removed when the writer is writing toward the top of a page.

IVhat I claim as new, and desire to secure by Letters Patent, is

l. In an ar1n-rest, the combination of a sup port provided with means for attaching it to a book, and an arm-support pivotally secured thereto to swing laterally and accompany the movement of the arm in writing across apage, substantially as described.

2. In an arin-rest, the combination of a support provided with means for attaching it to a book, an arm-support pivotally secured thereto to swing laterally and accompany the movement of the arm in writing across a page, and a sliding block upon the said pivotal support, substantially as described.

In an arm-rest, the combination of a support, att-aching means for the support, comprising a rod at one end ot' the support to enter between the back 'of the book and the bound edges of the leaves thereof and a projeetion toward the opposite end of the supaliy connected at one end to the bar A, and a port to rest upon leaves of the book, and

sliding block upon the bzw C, substantially as a pivotal arm-support, substantially as dedescribed. scribed.

4. In an arm-rest, the combination of a supporting-bzw A, a bearing-10GB, and a supporting projection z. on the bar A, :i bei C, pivot- ROBERT J. DAVIS.

In presence 0f- J. W. DYRENFORTH, M. J. FROST.