US413679A - Blackboard - Google Patents

Description

. (No Model.) I

- J. H. OBERGH.

BLAGKBOARD.

No. 413,679. Patented Oct. 29, 1889.

UNITED STATES PATENT OFFICE.

JOHN H. OBERGH, OF TITUSVILLE, PENNSYLVANIA.

BLACKBOARD.

SPECIFICATION forming part of Letters Patent No. 413,679, dated October 29, 1889. Application filed March 27, 1889. Serial No. 304,962. (No model.)

To all whom it may concern.- 7

Be it known that 1, JOHN H. OBERGH, a citizen of the United States, residing at Titusi0 a 3 shall not only be a beautiful and attractive ville, in the county of Crawford and State of Pennsylvania, haveinvented a new and use- .ful Improvement in Household Slates, of

- piece of furniture, but shall be convenient for use, and on occasion may be substituted for other articles of furniture, as a card-table, 850. Its use, however, is not limited. to the house, but may be equally adapted for use in the school-room.

My invention is illustrated in the accompanying drawings,in which- A representsthe slate-surface, framed in the ordinary manner by the frame B. This frameB is in turn surrounded by the outer frame 0, it being secured to this outer frame by the pivotal bolts D D (shown by dotted lines in the drawings) at the top and bottom ends.

Being thus secured, the slate A and a the frame B are allowed to swing and revolve freely horizontally within the outer frame 0,

- I l the only stop being the spring-catch E, which catches and holds, the frame B when its surface comes plane with the surface of the frame 0, and holds it until released by withdrawing the catch E.

F is a pencil or chalk tray attached at the bottom part of the frame B. This is duplicated on the opposite side of the frame.

The frameO is in turn supported by the legs or standards G G, being connected thereto I by the pivotal bolts H H, (shown partly by 1.40

dottedlines,) which allow the frame 0 and its inclosures to revolve vertically between the standards G G and being confined only by the thumb clamp-nutI upon the end of one of the bolts I-I. Bymeans of this clamp-nut the frame 0 can be readily clamped and held in any required position, vertical,horizontal, or inclined.

K is a shelf or fixed tray, placed there for convenience and to give additional strength and rigidity to the legs or supports G G. Oonstructed and supported in this way the slatesurface can be adjusted in any position and at any angle desired from vertical to horizontal,and the slate can be revolved completely within the frame 0. When clamped horizontally and the frame B held in place by the spring-catch E, it may be used as a card-table. It makes a neat and attractive piece of furniture, and when not in use can be set to one side, occupying but little space. It is more adapted and intended for household use and as a toy, but is convenient for many uses in the school-room.

The surface A is here described as slate, but may be of sili ate, blackboard, or any-. thing of similar nature.

I claim as my invention l 1. As ahousehold article of furniture or toy, a slate and frame adjusted to revolve horizontally within an outer frame which is adjusted to revolve vertically between two standards,

JOHNH. OBERGH.

' Witnesses:

A.'B. HOWLAND, G. P. KEPLER.

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