US968805A - Painter's extension-plank. - Google Patents

Description

J. RIIKONEN;

PAINTBR'S EXTENSION BLANK. APPLICATION FILED JAN. 16, 1909.

968,805. Patented Aug. 30, 1910.

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J. RIIKONEN.

PAINTERS EXTENSION PLANK.

APPLICATION FILED JAN.16, 1909.

968,805. Patented Aug. 30, 1910.

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J. RIIKONEN.

. Patented Aug.30, 1910.

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JOHN RIIKONEN, OF CHICAGO, ILLINOIS.

PAINTERS EXTENSION-PLANK.

Specification of Letters Patent. Patented'Aug. 30, 1910- Application filed January 16, 19(l9. Serial No. 472,745.

To all whom it may concern:

Be it known that I, JOHN RIIKONEN, a subject of the Czar of Russia, residing at Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Painters Extension-Planks, of which the following is a specification.

My invention relates to that class of supports called planks used by painters, paper hangers and decorators in the interior of buildings in which the rooms, halls, etc., vary in floor space and various lengths of planks are required for the support of the workmen in the performance of their work on the upper partsof the walls and ceilings.

The object of my invention is to provide a plank having independent slidable extensions; a main body supporting the extensions which consists of two portions pivotally joined together and adapted thereby to be folded close together and secured for easy transportation under the arm; which when opened for use will lock automatically in the open position the locking mechanism forming a truss by which the plank is adapted to sustain a weight several times greater than is ever required to be placed upon it, thereby providing for the lightest construction and material and'thus providing for the lightest, longest, strongest, most adjustable and convenient for use and transportation.

The manner in which I accomplish my ob ject is described in the following specification and illustrated in the accompanying drawings in which:

Figure 1 is a top plan of the device when folded for use, transportation or storage. Fig. 2 is a side elevation of the device folded Fig. 3 is a left end elevation and Fig. 4 a right end elevation of the device in the positions as shown in Figs. 1 and 2. Fig. 5 is a top plan of the device opened out to the locked position of the two main parts. Fig. 6 is a side elevation, the parts being in the same position as in Fig. 5 resting on the top of supporting ladders, the dotted lines indicating the extensions and change in position of the supporting ladders. Fig. 7 is an enlarged detail of the locking mechanism. Fig. 8 is an enlarged detail of Fig. 7. Fig. 9 is an enlarged detail of partof the lock shown in Fig. 7. Fig. 10 is an underneath plan of the parts in the position shown in Fig. 5. Fig. 11 is the same as Fig. 10 with the extension partly drawn out. Fig. 12 is a vertical cross seca main center bar B and B and smaller 4 bars B At the pivoted ends of these parts the bars B are spaced from each other by space blocks B and secured together by the tie rods 13*. At the other ends the bars B, B and B are spaced and tied together by tie plates B and bolts 13. Slidably supported between the bars and tie plates of the parts A and A are extensions C and C These parts consist of bars C. The ends of the bars slidable in the parts A and A are secured together by the tie plates C and bolts C. The exterior ends are spaced by the blocks C and secured together by the tie rods G Secured to the underside of the bars B and blocks 13 are hinge plates D,

these together with the brackets D are pivotally joined by the bolts D Pivotally connected to the brackets D are truss rods D The other ends D of these rods are adapted to be parts of a locking device herein after described.

Secured to the undersides of the center bars B and B are slotted lock plates E. These plates are adapted to guide and slidably secure the ends D of the truss rods, the movements of which are limited by the slots E. On the side of these look plates, secured on the bars B and B are spring latches F. Under the free end of each of these latches, the ends D of the truss rods are moved and are locked when the parts A and A are opened to the position shown in Fig. 6. To release the truss rods from this locked position, the latches are moved by pressure on the ears F till the ends D of the truss rods are free. When the parts A and A are folded together the ends D of the truss rods slide to the other end of the lock plates as shown in Fig. 2. To hold the parts A and A in the folded position the hooks G in the ends of the extensions C and C are made fast as shown in Figs. 2 and 4:.

When the several parts are constructed and combined as described and illustrated the device is operated and used as follows:

For storage, transportation or use in the smallest space, the parts A and A are folded and hooked together in the position shown in Figs. 1, 2, 3, and 4. When in general use the parts A and A are opened to the position shown in Figs. 5 and 10. As these parts are opened the ends D of the truss rods D slide from the position shown in Fig. 14 along the plates E and under the nose F of the latch F. When the end D reaches the end of the slot the latch snaps over it as shown in Fig. 13. WVhen both ends reach the locked position the brackets D are vertical as shown in Fig. 6, and the truss complete and secure. When a greater length is required one or both extensions can be drawn out as shown in Fig. 11, the horses or ladders being moved to the extensions as shown by the dotted lines in Fig. (3.

hat I claim and desire to secure by Letters Patent is A device of the kind described, consisting of two main portions constructed of a series of bars slidably connected together, two pairs of angle plates secured to the underside of the fixed outer bars, the vertical parts of each pair of plates being adapted to be joined by a pivot bolt and thereby form hinged joints connecting said Inain portions; a pair of plate bar brackets bent in the form of a V the ends thereof being twisted and thereby adapted to form a pivot joint at the apex and to be pivotally joined at the other ends to said angle plates and thereby form part of said hinge joints; pivot bolts and nuts adapted for joining said parts; two longitudinal bars pivotally connected to the apex joint of said brackets, the opposite ends of said bars bent at right angles and forming a horizontal transverse projection; a pair of slotted plates secured one to the underside of the central fixed bar in each of said main portions and spaced therefrom, each of said plates being adapted to slidably secure the transverse projecting end of said longitudinal bars; and a pair of spring latches, secured one on each of said central fixed bars parallel with said slotted plates the free end of each of said latches being adapted to be raised by said projecting ends of said ba'rs slidable in said plate and to snap lock said bars in said plates when said main portions are extended for use and to be raised and thereby release said bars whereby said bars are free to slide in said plates when said main portions are folded together as described.

JOHN RIIKONEN.

Witnesses THOMAS J. MORGAN, JOHN LINNA.

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