US994570A - Combined protractor and t-square. - Google Patents

Combined protractor and t-square. Download PDF

Info

Publication number
US994570A
US994570A US61134111A US1911611341A US994570A US 994570 A US994570 A US 994570A US 61134111 A US61134111 A US 61134111A US 1911611341 A US1911611341 A US 1911611341A US 994570 A US994570 A US 994570A
Authority
US
United States
Prior art keywords
protractor
blade
square
arm
combined
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
Application number
US61134111A
Inventor
Francisco A Del Castillo
Original Assignee
Francisco A Del Castillo
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Francisco A Del Castillo filed Critical Francisco A Del Castillo
Priority to US61134111A priority Critical patent/US994570A/en
Application granted granted Critical
Publication of US994570A publication Critical patent/US994570A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B43WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43LARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
    • B43L7/00Straightedges
    • B43L7/02T-squares and other similar squares

Description

n A. DEL CASTILLO. H COMBINED PROTRAGTOR AND T SQUARE.
APPLICATION rmm FEB. 28,
Patented June ,1911.
II/II I /wavm/ fianowoo Jldefimtello momvrrs win/5885s m: norms PE q WAsrirNcYoN, u. c
** UNITED STATES FRANCISCO A. DEL CASTILLOQO F WASHINGTON, DISTRICT OF COLUMBIA.
OQMBINED PRO 'IRACTOR AND T-SQUARE.
Specification of Letters Patent.
Patented June 6, 1911.
Application filed February 28, 1911. Serial No. 611,341.
To all whom 'it mag concern: 7
Be it known that I, FRANCISCO A. DEL CAsTILLo, a citizen of the United States,
and a resident of Washington, in the District of Columbia, have invented a new and Improved Combined Protractor and, T- Square, of which the following is a full, clear, and exact description.
The invention relates to drafting instruments, and its object is to provide a new and improved combined protractor and T, square, for the use of draftsmen, engineers and other persons, and arranged to permit of setting the blade of the square to any desired angle indicated on the protractor or to accurately fasten the blade in right-angle position relative to the base of the protractor. For the purpose mentioned use is made of a protractor, at the center of which is pivoted a blade, and an arm extends from the pivot of the blade and is provided with spaced pins straddling the sides of the blade, the pins also engaging apertures in the protractor.
A practical embodiment of the invention is represented in the accompanying drawings forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.
Figure l is a plan view of the combined protractor and T square; Fig. 2 is an edge view of the same; and Fig. 3 is a sectional side elevation of the same on the line 33 of Fig. 1.
The protractor A, of metal or other suitable material, is provided with a base B and the usual graduations G indicating degrees and subdivisions, and on the center of the protractor A is arranged a clamping screw D forming the pivot for a blade E having a graduated portion E extending beyond the base B, and a portion E extending onto the face of the protractor, as plainly indicated in Figs. 1 and 2. On the terminal of the portion E is secured or formed a pointer F, indicating on the graduations C of the protractor A.
An arm G engages the clamping screw D and is provided at its free end with spaced pins G, G straddling the sides of theportion'E of the blade E, the said pins also engaging apertures A, A formed in the protractor A at opposite sides of the 90 mark of the graduations C, as will be readily understood by reference to Figs. 1 and 3.
It is understood that when the pins G, G engage the apertures A, A then the blade E is held against swinging movement on its pivot D and at the same time the pointer F indicates accurately on the 90 mark of the graduations C so that the blade E extends at right angles to the base B of the protractor A. A screw H extending through the protractor A, blade E and arm G, serves to hold the arm G firmly in position when the pins G, G engage the apertures A, A in the protractor A.
When it is desired to swingthe blade E into any desired angular position relative to the base B of the protractor A then the arm G and screw H are removed so as to permit free swinging movement of the blade E on the pivot D held on the protractor A.
The combined protractor and T square shown and described is very simple and durable in construction, and the parts can be readily assembled to form practically a permanent T square by the base B of the protractor A and the blade E, the arrangement also permitting of swinging the blade E into a desired angular position and clamping it therein by the clamping screw D in case the arm G and bolt H are rei moved, as previously explained.
It is understood that the arm G serves to fix the blade E firmly in position on the protractor A and at right angles to the base B of the protractor so that the tool can be used the same as any ordinary T square.
Having thus described my invent-ion, I claim as new and desire to ters Patent:
1. A combined protractor and T square, comprising a protractor, a blade carrying a pointer indicating on the graduations of the said protractor, a clamping screw pivot on the center of the protractor and engaging the said blade, and an arm held on the said pivot and provided with pins straddling the sides of the blade and engaging spaced apertures in the said protractor to hold the blade in a right angle position relative to the base of the protractor.
2. A combined protractor and T square, comprising a protractor, a blade carrying a pointer indicating on the graduations of the said protractor, a clamping screw pivot on the center of the protractor and engaging the said blade, an arm held on the said secure by Letr pivot and provided With pins straddling In testirnony whereof I have signed my the sides of the blade and engaging spaced name to thls specification in the presence of apertures in the said protractor to hold the two subscribing Witnesses.
blade in a right angle position relative to FRANCISCO A. DEL CASTILLO. 5 the base of the protractor, and a clamping l WVitnesses:
screw engaging the said protractor, blade G. STEWART ONEILL,
and arm. RAoUL WASHINGTON.
Copies of this patent may be. obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0'.
US61134111A 1911-02-28 1911-02-28 Combined protractor and t-square. Expired - Lifetime US994570A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US61134111A US994570A (en) 1911-02-28 1911-02-28 Combined protractor and t-square.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US61134111A US994570A (en) 1911-02-28 1911-02-28 Combined protractor and t-square.

Publications (1)

Publication Number Publication Date
US994570A true US994570A (en) 1911-06-06

Family

ID=3062903

Family Applications (1)

Application Number Title Priority Date Filing Date
US61134111A Expired - Lifetime US994570A (en) 1911-02-28 1911-02-28 Combined protractor and t-square.

Country Status (1)

Country Link
US (1) US994570A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2495841A (en) * 1946-06-13 1950-01-31 Fink Homer Surface gauge
US2923061A (en) * 1953-12-31 1960-02-02 Gregory S Dolgorukov Drawing instrument

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2495841A (en) * 1946-06-13 1950-01-31 Fink Homer Surface gauge
US2923061A (en) * 1953-12-31 1960-02-02 Gregory S Dolgorukov Drawing instrument

Similar Documents

Publication Publication Date Title
US1257683A (en) Combination-tool.
US327283A (en) Adjustable pitch-board for squares
US994570A (en) Combined protractor and t-square.
US1255429A (en) Combination square and protractor.
US579952A (en) Combination-tool
US842585A (en) Drafting attachment.
US2104354A (en) Draftsman's instrument
US1001229A (en) Combination-tool.
US787172A (en) Combination-tool.
US738130A (en) Combination-tool.
US678005A (en) Folding rule.
US960196A (en) Square and bevel.
US1096511A (en) Protractor.
US413497A (en) Protractor
US1000133A (en) Square and bevel.
US1061045A (en) Rule attachment.
US703235A (en) Protracting-ruler.
US1242467A (en) Geometrical instrument.
US313290A (en) Pendulum-lev el
US753025A (en) Heney woodboeough
US1182638A (en) Engineer's plotter.
US446882A (en) Surveyor s plotting-instrument
US823444A (en) Measuring instrument.
US513828A (en) Protractor
US1307076A (en) Combination drawing- and measuring instrument