US225215A - School-slate - Google Patents
School-slate Download PDFInfo
- Publication number
- US225215A US225215A US225215DA US225215A US 225215 A US225215 A US 225215A US 225215D A US225215D A US 225215DA US 225215 A US225215 A US 225215A
- Authority
- US
- United States
- Prior art keywords
- slate
- wire
- school
- bent
- hinge
- 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
- 239000010454 slate Substances 0.000 title description 10
- 210000003414 Extremities Anatomy 0.000 description 6
- 230000002441 reversible Effects 0.000 description 6
- 238000005452 bending Methods 0.000 description 4
- 230000001808 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 229910001369 Brass Inorganic materials 0.000 description 2
- 239000010951 brass Substances 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006011 modification reaction Methods 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
- A47B97/00—Furniture or accessories for furniture, not provided for in other groups of this subclass
- A47B97/001—Wall mounting or suspension arrangements for blackboards or the like
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
- B43L1/00—Repeatedly-usable boards or tablets for writing or drawing
Definitions
- My improved coupling device consists, essentially, of a slender metallic rod or wire, which, in connection with suitably grooved and notched slate-frames, serves as a reversible hinge.
- said Wire is bent near each end, first at right angles to the central port-ion, and then bent back to its former direction, thus forming a bayonet-shaped hinge at each end, the middle portion of the wire bcing parallel to the extremities, as hereinafter described.
- the thus bent wire having been inserted in the grooves prepared for it is secured in place by the closure of the grooves by means or glued wooden strips or by metallic staples, or both.
- Figure l is a perspective view of a folding school-slate embodying 'my invention.
- Fig. 2 is a back-edge view of the two frames, and of the couplingwire and the cleats detached. sents a modification of my improvement.
- a and A' represent the two leaves of a reversible slate whose frames have the customary half-round or convex edges.
- rIhe Opposing frame-edges are grooved longitudinally at a a', and notched transversely at a, for the recep- Fig. 3 repretion of a slender cylindrical rod or'wire, B, which is bent near its extremities, b b', into the form of a bayonet-like hinge by rst bending the wire at right an gles to the centralportion, and then bending them so that they shall extend in their former direction, said hinge being out of line but parallel with the middle portion, b, of the wire.
- the thus bent wire having been inserted in the grooves a d is secured in place by the insertion of ⁇ glued wooden strips or cleats C, or by staples D, or by both staples and cleats, if desired.
- the piece B may be easily and cheaply formed out of round wire, of brass, iron, or other suitable metal, by aV single Operation of suitable dies.
- the coupling-wire may have a greater number of bends, as shown in Fig. 3.
- the longitudinal grooves may be formed in the face instead of in the edge of i the, slate-frame.
Landscapes
- Toys (AREA)
Description
N.Du13RUL.V School-Slate..
No. 225,215. Patented Mar. 9, 1880.
.vc-IL www? UNITED STATES PATENT OFFICE.
NAPOLEON DU BRUL, OF CINCINNATI, OHIO.
SCHOOL-SLATE.
`'SPECIFICATION forming part of Letters Patent No. 225,215, dated March 9, 18.80.
Application filed December B, 1879.
or coupling device for those school-slates which consist of two leaves or tablets so connected as to be capable of being folded with equal ease either forward or backward.
My improved coupling device consists, essentially, of a slender metallic rod or wire, which, in connection with suitably grooved and notched slate-frames, serves as a reversible hinge. For this purpose said Wire is bent near each end, first at right angles to the central port-ion, and then bent back to its former direction, thus forming a bayonet-shaped hinge at each end, the middle portion of the wire bcing parallel to the extremities, as hereinafter described. The thus bent wire having been inserted in the grooves prepared for it is secured in place by the closure of the grooves by means or glued wooden strips or by metallic staples, or both.
In the accompanying drawings, Figure l is a perspective view of a folding school-slate embodying 'my invention. Fig. 2 is a back-edge view of the two frames, and of the couplingwire and the cleats detached. sents a modification of my improvement.
A and A' represent the two leaves of a reversible slate whose frames have the customary half-round or convex edges. rIhe Opposing frame-edges are grooved longitudinally at a a', and notched transversely at a, for the recep- Fig. 3 repretion of a slender cylindrical rod or'wire, B, which is bent near its extremities, b b', into the form of a bayonet-like hinge by rst bending the wire at right an gles to the centralportion, and then bending them so that they shall extend in their former direction, said hinge being out of line but parallel with the middle portion, b, of the wire. The thus bent wire having been inserted in the grooves a d is secured in place by the insertion of `glued wooden strips or cleats C, or by staples D, or by both staples and cleats, if desired.
The piece B may be easily and cheaply formed out of round wire, of brass, iron, or other suitable metal, by aV single Operation of suitable dies. 1
The above-described illustration 0E my invention lmay be changed in non-essential particulars. For example, the coupling-wire may have a greater number of bends, as shown in Fig. 3. The longitudinal grooves may be formed in the face instead of in the edge of i the, slate-frame.
I claim as new and as my inventiony The double reversible school-slate consisting of a pair of round-edged and longitudinallygrooved and transversely-notehedleaves, A' a a, and the rod or wire B, bent or formed at the extremities b b into the bayonet-like form shown, the whole being arranged, secured, and adapted to operate substantially as set forth.
In testimony of which invention I hereunto set my hand.
NAPOLEON DU BRUL. Attest:
GEO. H. KNIGHT, WALTER KNIGHT.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US225215A true US225215A (en) | 1880-03-09 |
Family
ID=2294604
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US225215D Expired - Lifetime US225215A (en) | School-slate |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US225215A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5403017A (en) * | 1993-09-16 | 1995-04-04 | Unisys Corporation | Target lifter with impact sensing |
-
0
- US US225215D patent/US225215A/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5403017A (en) * | 1993-09-16 | 1995-04-04 | Unisys Corporation | Target lifter with impact sensing |
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