US144289A - Improvement in blackboards - Google Patents
Improvement in blackboards Download PDFInfo
- Publication number
- US144289A US144289A US144289DA US144289A US 144289 A US144289 A US 144289A US 144289D A US144289D A US 144289DA US 144289 A US144289 A US 144289A
- Authority
- US
- United States
- Prior art keywords
- blackboard
- blackboards
- leaves
- improvement
- hinged
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 210000003813 Thumb Anatomy 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000000875 corresponding Effects 0.000 description 2
- 230000000284 resting Effects 0.000 description 2
- 230000000717 retained Effects 0.000 description 2
Images
Classifications
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
- A47B41/00—School desks or tables
- A47B41/02—Adjustable, inclinable, sliding or foldable desks tops
Definitions
- Figure l represents a side elevation, partly in section, of my improved blackboard with supportingstandard; and Fig. 2, a horizontal section through the blackboard on the line c c, Fig. l, showing arrangement of folding leaves.
- the object of my invention is to construct a blackboard, which can be readily inclined into any position for greater convenience, raised to suitable height, and also be used as a table, to be folded up and moved into a corner to be out of the way.
- My invention consists, mainly, in arranging the blackboard with hinged leaves in a strong standard or stock, in which it may be raised or lowered by rack and ratchet arrangement, to be inclined by hinged arm and bow construction, and folded open by pivoted levers.
- A represents the standard or stock of the blackboard B, constructed of suitable strength and dimensions, and resting on legs and central support.
- the stock A guides centrally the vertical rack C, which is raised and lowered by ratchet a with crank b, and retained in position by pawl d.
- To the upper end of rack C is applied, by screw and thumb nut c, so as to turn freely thereon, the
- the leaves B2 are hinged sidewise to the central leaf B1, to be folded like the leaves of a table.
- Levers f which turn on bolts Z, applied at the rear of leaves B2, secure rigidly, by thumb-screws m, the open position of the same when turned under central leaf' B1.
- the whole board B turns easily on rack G, and may be inclined in such position that the work may be more conveniently done thereon, and be seen fully.
- the rack is lowered in stock A, the board placed in a horizontal position, and the leaves folded down.
- the blackboard is then rolled into a corner, or used as a table, or for other purposes, as may be desired.
Description
J. REBER.
B lvackhnards. y
No, 144,289, Patented Nov. 4,1873.
Inv/amar.
Wimesses' n QwyWL/ Per fbi/44% numgys.
UNITED STATES PATENT GEEIGE.
JAMES EEEEE, or NEBEAsnA, on'ro.
IMPROVEMENT IN BLACKBOARDS.
Specification forming part of Letters Patent No. 144,2S9, dated November 4, 1873; application led f July 26, 1873.
To all whom it may concern:
Be it known that I, JAMzEs REBER, of' Nebraska, in the county of Pickaway and State of Ohio, have invented a new and Improved Blackboard, of which the following is a specification:
In the accompanying drawing, Figure l represents a side elevation, partly in section, of my improved blackboard with supportingstandard; and Fig. 2, a horizontal section through the blackboard on the line c c, Fig. l, showing arrangement of folding leaves.
Similar letters of reference indicate corresponding parts.
The object of my invention is to construct a blackboard, which can be readily inclined into any position for greater convenience, raised to suitable height, and also be used as a table, to be folded up and moved into a corner to be out of the way. My invention consists, mainly, in arranging the blackboard with hinged leaves in a strong standard or stock, in which it may be raised or lowered by rack and ratchet arrangement, to be inclined by hinged arm and bow construction, and folded open by pivoted levers.
In the drawing, A represents the standard or stock of the blackboard B, constructed of suitable strength and dimensions, and resting on legs and central support. The stock A. guides centrally the vertical rack C, which is raised and lowered by ratchet a with crank b, and retained in position by pawl d. To the upper end of rack C is applied, by screw and thumb nut c, so as to turn freely thereon, the
horizontal arm D with T-shaped head, which is hinged to staples f screwed firmly to the rear of the central leaf B1 of board B. The other end of arm D is slotted, and guides the bow-shaped lever E, whichis hinged at g at the upper part of the same leaf. The blackboard B may be adjusted to any desired inclination, from a horizontal to a vertical posia tion, by the action of thumb-screw h at end of arm D on lever E. Projecting lugs z', at lower end of lever E, define the extreme posi= tion into which the blackboard B may be placed. The leaves B2 are hinged sidewise to the central leaf B1, to be folded like the leaves of a table. Levers f, which turn on bolts Z, applied at the rear of leaves B2, secure rigidly, by thumb-screws m, the open position of the same when turned under central leaf' B1. The whole board B turns easily on rack G, and may be inclined in such position that the work may be more conveniently done thereon, and be seen fully.
For placing the blackboard out of the way, the rack is lowered in stock A, the board placed in a horizontal position, and the leaves folded down. The blackboard is then rolled into a corner, or used as a table, or for other purposes, as may be desired.
Having thus described my invention, I claim as new and desire to secure by Letters Patentl. The adjustable folding blackboard, con-
Publications (1)
Publication Number | Publication Date |
---|---|
US144289A true US144289A (en) | 1873-11-04 |
Family
ID=2213702
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US144289D Expired - Lifetime US144289A (en) | Improvement in blackboards |
Country Status (1)
Country | Link |
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US (1) | US144289A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2603543A (en) * | 1949-05-28 | 1952-07-15 | Rene E Barbin | Picnic table with adjustable top |
-
0
- US US144289D patent/US144289A/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2603543A (en) * | 1949-05-28 | 1952-07-15 | Rene E Barbin | Picnic table with adjustable top |
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