US677052A - Lock for step-ladder chairs. - Google Patents

Description

No. 677,052; 7 Pdte'nfe'd lune 25, 190i. L. BAUMEB, LOOK FOR STEP LADEER CHAIRS.

(Application filed (No Model.)

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UNITED STATES PATENT OFFICE.

LOUIS BAUMER, OF JOHNSTOWN, PENNSYLVANIA.

LOOK FOR STEP-LADDER CHAIRS.

SPECIFICATION forming part Of Letters Patent No. 677,052, dated June 25, 1901.

Application filed March 29, 1901. Serial No. 53,495. (No model.)

To all whom it may concern.-

Be it known that I, LOUIS BAUMER, a citizen of the United States, residing at J ohnstown, in the county of Cambria, State of Pennsylvania, have invented certain new and useful Improvements in Looks for Step -Ladder Chairs, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to a lock for stepladder chairs, and particularly to a device adapted to lock and hold the chair in either of its adjusted positions.

The invention has for its object to provide a lock comprising a single member simple in construction and operation, pivotally mounted upon a relatively. fixed part of the chair and adapted to engage locking members carried by a movable portion of the chair when in its different adjusted positions.

Other objects and advantages of the invention will hereinafter appear in the following description and the novel features thereof will be particularly pointed out in the appended claim.

In the drawings, Figure 1 represents the chair in the form of a step-ladder. Fig. 2 is a similar view with the parts arranged as a chair. Fig. 3 is an elevation of the locking device, and Fig. at is a longitudinal section of the locking device.

Like letters of reference indicate like parts throughout the several figures of the drawings.

Theletter A designates a step-ladder chair,

which may be of any ordinary and desired construction, composed of a section A, pivoted to the base A and carrying the rear or back leg A and the back-supporting standards A while the portion Ais provided with the front leg A which is always relatively fixed to the movable portion A in its several adjusted positions. The fixed and movable portions of the chair are pivoted in any desired manner for instance, as shown at A so that when in the position shown in Fig. 1 a step-ladder is formed, while when folded into the position shown in Fig. 2 a chair is provided. The details of construction of these parts are common in the art, and the inven tion is in no wise limited to the same.

The locking device B is provided at one end with a pivoting-socket B, and upon the opposite sides thereof locking-recesses B and B are provided. In the structure shown recesses are used; but it will be obvious that any other desired engaging device may cooperate with the pins or projections O and O, secured, respectively, at the upper and lower portions of the standard, which forms the back of the chair when in the position shown in Fig. 2. The locking device or plate may be provided with a stiffening-rib for instance, as shown at B -and suitably ornamented in any desired manner. This device is pivoted to the relatively fixed member of the chair, preferably to the leg A by means of the ap erture B. and adapted to swing upon that pivot, so as to bring either the recess B in engagement with the pin 0, Fig. 1, to lock the parts in position as a ladder, or by swinging the'plate completely over the recess B is brought into engagement with the pin C. These recesses are shown as located at difierent distances from the pivotal point of the plate,which distances may be varied, dependent upon the-distance of the locking-pins C and G from the pivotal point B of the locking 'device B.

From the foregoing description the operation of the parts will be clearly understood, and it will be further understood that the locking device is adapted to lock and hold the chair in either of its adjusted positions by a single simple plate so mounted upon a relatively fixed part as to engage separate and independent locking members upon a movable or adjustable part. It will further be seen that the device is of such a character that it can be applied to chairs of this construction now in use by the simple insertion of a retaining-screw and the locking-pins for engagement with the plate.

Having described my invention, What is claimed is- A step-ladder chair comprising relatively fixed and movable members, locking projections upon opposite end portions of said movable member, aplate pivotally mounted upon I In testimony whereof I afiix my signature said fixed member of the chair and provided in presence of two witnesses.

upon its opposite faces with lockin sockets disposed at a distance from the pivotal point LOUIS BAUMER' 5 to permit engagement with either of said pi'o- \Viinesses:

jeotions to lock the chair in its adjusted po- WILL. J. LAMBERD,

sitions; substantially as specified. A. G. RIPPLE.

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