US249924A

US249924A - Invalid-bedstead

Info

Publication number: US249924A
Authority: US
Publication date: 1881-11-22
Anticipated expiration: 1898-11-22

Description

(No Model.)

A. J, GOODWIN.

INVALID BEDSTEAD. No. 249,924. Patented Nov. 22,1881.

WIVTNESSES: INVENTOR:

&u/pw BY i ATTORNEYS.

NITED STATES PATENT OFFICE@ ASAHEL J. GOODWIN, OF BROOKLINE, MASSAGHUSETTS.

.INVALI D-BEDSTEAD.

SPECIFICATION forming part of Letters Patent No, .249,924, dated November 22, 1881.

Application filed March 10, 1881. (No model.)

To all whom 'it may concm Be it known that I, ASAHEL J. GOODWIN, of Brookline, in the county ot' Norfolk and State of Massachusetts, have invented a new and useful Improvementin Invalid-Bedsteads, of which the following is a specification.

Myimprovements relate to the devices used for raising and lowering the hinged sections of invalid-bedsteads, and have for their object to obtain great power by Conveniently-operated mechanism.

The invention consists in a raek and pinion combined with a cani on which the hinged seotion is supported; also,in a pawl for retaining the parts in position against downward pressure, all as hereinafter described and claimed.

The accompanying drawing is a sectional side view of the head portion of a bedstead having my invention applied.

A is the side rail, B the head-board, and O the hinged or pivoted section of the bed-bottom, which may he ot' any suitable construction. i

D is the cam, hung on a stud, a, or shatt that is attached to the rail A, and having its upper side made of suitable shape. b is afriction-roll attached to section U and resting on the cam D. The central portion of the cam D is cut out or slotted, and the outer side of the slot is 'o'med as a rack, c, curved in the arc ot' a circle, having its center at the stud or shaft e.

In the rail A is fitted a short arbororshaft, d, on which is fixed a pinion, c, that meshes with the rack c. Outside the rail the arbor d is formcd to receive a crank-landle. A pawl, f, hung on rail A, engages the pinion e in a manner to prevent backward movement of the pinion by pressure on the cam.

lt will be seen that power applied to turn the pinion is eXerted on the cam at a distance from the center, so that when the section is first moved, the roller b being near the stud a, the greatest power is exerted to raiseit; Then, as the cam rises, the roller moves outward on the cam, and the motion increases in rapidity proportionate to the decrease of weight on the cam occurring by increased inelination of the section C.

At the heel of the cam there is a stud or pin, '5, having an enlarged head for connection of the rod that passes in the usual manner to the cam that acts on the lower or foot section of the bed, as shown and described in my application for a patent on invalid-bed, filed December 18,1880, so that both sections shall, when foot is depressed, be moved simultaneously.

Byconnecting the rod k directly to the cam, instead of to an arm on a cross-shaft carrying the cani, the mechanism is rendered more simple and convenient.

There maybe two cams, D, placed on a crossshait for raising the section C.

I do not limit myself to the rack formed at the inside ot' a slot in a cam, as it may be at the outer edge of the cam, and the pinion placed to correspond.

It will he observed that the greatest power is obtained exactly where itis needed-namely, at the first movement, and when the whole weight is directly upon the eccentric. As the bed rises the weight lessens necessarily, and, less power being then needed, the devices are arranged to act more rapidly. During the movement the friction-roll b crosses the line of the pinion e, thus actually changing the order of the leverage.

What I claim as new is 1. As an improvement in means for raising the hinged sections of invalid-bedsteads, the eccentric lever D, formed with rack c and pinion e, in combination with the hinged section G, provided with t'riction-roll b, substantially as shown and described.

2. The combination, with the hinged section G, of eccentric D, pinion e, rack c, pawl f, and friction-roll b, the latter fixed on the section and hearing on the eccentric, substantially us and for the purpose set forth.

ASAHEL JEWEL GOODWIN.

Witnesses:

GEO. D. WALKER. C. SEDGWICK.