Improvements in and relating to beds and fittings for the use of invalids and the like / [William Abbot Nason].

  • Nason, William Abbot.
Date:
1902
Catalogue details

Licence: Public Domain Mark

Credit: Improvements in and relating to beds and fittings for the use of invalids and the like / [William Abbot Nason]. Source: Wellcome Collection.

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    Improvements in and; elating to Beds and Fittings for the Use of Invalids, Ac. adjustment at both ends the device may be accommodated to beds from the widest to the narrowest. For the purpose of journalling the shafts at the hubs J)1, D1, on suitable supports, I provide clips, E, E, etc., adapted to be clamped onto the side rails of the bed or mattress supporting spring, such clips having an inwardly jutting stud, E1, which enters the axial aperture in the boss I)1, and 5 so journals the crank shaft. Depending flanges of the angle irons which stiffen the plug-supporting perforated plate are apertured to receive the crank wrists, and two clips, E, E, are mounted on each side rail of the mattress supporting spring, at the same distance apart as the aperture for the crank wrists in said plug-supporting link; the corresponding clips on opposite side rails being of ] 0 course mounted on the studs, E1, which constitute the journal bearings of the cranked shafts in line respectively, and the four clips being mounted at such position on the rails with respect to the position of the aperture in the mattress support and mattress, that when the cranked shafts thus constituted are rocked to swing up the plug supported on the link, C, said plug may enter and occupy 15 the aperture. In order to make it practicable to get the opposite studs E1, E1, in line, notwithstanding the fact that the side rails B1 when of wood are fre¬ quently warped and twisted more or less, I employ two screws!, e, e, in one of the fork arms of the clip E, which may be set so as to protrude different distances and impinge on the rail and bind the clip to it with the studs projecting at the 20 proper line. Only one screw, e1, need be used in the other fork arm of the clip. This feature of construction is shown in Figure 4. The same expedient adapts the clip for fastening to a tubular side bar, b1, as shown in Figure 6. In order to operate the cranked shaft, and thus carry the plug into and out of place, it is convenient to provide lever arms for the rock shafts other than the cranks; 25 and since these lever arms', or one, at least, should be conveniently near the side of the bed, and must be rigid with the shaft, it is most convenient to form each of the cranks with such a lever arm, in addition to the crank proper to which the wrist is attached; and I have shown the fitting which constituted the crank mad© with such a lever arm, D4, rigid and integral with it. Such lever arm, for 30 the purpose indicated, preferably extends obliquely downward from the axis of the rock shaft when the crank arm is extended horizontally, to uphold the plug so that it is at an angle of from 45° to 60° with the crank. Inasmuch as the mattress as a whole is usually provided with a spring support, as shown, and yields to the weight of the patient, it is important that the plug should be made 35 similarly yielding when it is in position in the mattress aperture, and in order to effect this result, since the plug is positively upheld by the cranked shafts described, those cranked shafts must in some manner be arranged to yield to any weight operating on the plug substantially as much as the mattress as a whole yields under the same pressure. For this purpose I provide an extensibly coiled 40 spring, Gr, which may be hooked onto the side rail of the mattress supporting spring, and at its lower end hooked onto a lever arm, D4, which may be provided with a sidewardly jutting stud d*, for that purpose. The spring should be dis- engaigable at one end or the other, in order to permit the rock shaft to be operated to withdraw the plug. Most conveniently the spring is made to be disengaged 45 from the lever, being left suspended from the rail, and a hook, iN?, depending from the rail, engages the stud to hold the plug out of the way of the vessel. Since the cranks D, D, are substantially horizontal, and so are all in one plane, and that the same plane as the link C, when the plug is fully elevated it is desir¬ able to provide other connection between the two cranked shafts which shall be 50 in a different plane at that stage. This is conveniently effected by providing a link, F, connecting the lever arms, D4, at either side of the bed, such link being in length between centers of the pivotal connection equal to the distance between, centers of the shaft journal bearings, E1, E1, so that the link maintains at all stages a position parallel with the link C and the plug thereon, and prevents any 55 unequal rocking of the two shafts which would cause 01* permit the plug to become otherwise than horizontal.