US1717570A - Framing instrument - Google Patents

Description

June 18, 1929. c. w. LINTNER FRAMING INSTRUMENT Filed Sept, 13, 1926 Wm M W annunnunnunnnuuununnuununuunuununnunuunnnuununnnnunuuuunuuuunuununnunnnnnnnunnuununnuuuu mu Zv Patented June 18, 1929.

UNITED ST T S CHARLES w. LINTNER, or KANsAsoI'rY, ,MISSOURI, AssI'GNoR ononn-irnmrro,

HARRY s'rE'rLnn; on

FRAMING INSTRUMENT.

A AppIication filed September My invention relates to framing instruments whereby a carpenter or other mechanic can readily ascertain the lengths and bevels of all kinds of rafters, hips, groins, braces,

brackets, purlines, hoppers, stairs, and the bevels and cuts of polygon miter-s, without resorting to intricate mathematical calculations.

The instrument is of relatively simple and inexpensive construction, and so arranged that it can be folded into compact form and easily carried with a kit of tools.

In order that the invention may be fully understood, reference will now be had to the accompanying drawing, in which:

Fig. 1 is a plan view of the instrument showing a blade thereof adjusted at an angle, by dotted lines.

Fig. 2 is an enlarged broken vertical section on line 2-2 of Fig. 1.

Fig. 3 is a cross section on line 3-3 of Fig. 1.

Fig. 4 is a cross section on line 44 of Fig. 1. g

In carrying out the invention, I employ a primary beam 2 to which a miter blade 4 is pivotally connected at one end by suitable means such as a set screw 6 which is equipped with washers 8, one of which bears against the beam 2 and the other against the blade 4 to clamp said beam and the blade firmly together when the set screw 6 istightened.

1O designates a secondary beam arranged at an angle of ninety degrees to the primary beam 2.

12 designates a holder for holding the secondary beam 10 at an angle of ninety de--,

grees to the primary beam 2. The holder 12 comprises legs 14- and 16 arranged at right angles to each other,and a miter member 18' united at its ends with the outer ends of the legs 14 and 16. The leg 14 has a longitudinal passage 20 in which the shank 22 of the secondary beam 10 is slidably mounted and removably secured by a set screw 24 threaded into said leg 14.

The leg 16 of the holder 12 is provided with a longitudinal slideway 26 to receive one of.

. the longitudinal margins of the primary beam 2, said margin being provided with a flange 28 so that the beam 2 cannot be removed, except by sliding off the end of the slideway 26. A set screw 30 is threaded into the slideway 13, 1926. Serial No. 135,158.

26 for firmly securing the beam 2 and the holder 12 in any of their adjusted positions. As shown by Fig. l, the beams 2 and 10 and the blade 4 are provided on their faces with graduated marks representing inches and. fractions thereof, so that in the use of the instrument certain marks can be brought into a certain correlation with apiece of lumber to be out. As shown by Figs. 1, 2 and 4 one side of the slideway 26 terminates just above the flange 28 in order to expose the graduations 0n the primary beam2.

The following is a simple example in the use ofthe instrument. If it is desired to obtain the length of a rafter for a roof to be of a A thirty-two foot span'with a perpendicular height of sixteen feet at thecenter, the holder 12 is shifted longitudinally upon theprimary beam 2 to bring the inner edge of the secondary beam 10 into line with the graduation 16 upon said primary beam 2. The miter blade 4 is then adjusted upwardly until its inner margin intersects the graduation mark 16 on the secondary beam 10. I The space on the inner margin of the miter blade 4 between the axis of the screw 6 and where it intersects the inner margin of the secondary beam 10 will represent the length of the rafter. After the instrument has thus been adjusted to determine the length of the rafter the primary beam 2 will give the bevel for the lower end and the secondary beam. 10 the bevel for the upper end of the rafter. Many other examples obvious to those skilled in the art I could be given.

When lumber is to be ripped to any certain;

width the secondary beam 10 can be adjusted longitudinally to the proper point in the leg 14 of the holder 12 to constitute a reliable gage whereby the lumber can be accurately ripped. A r

The Initermember 18 of the holder 12 reinforces the legs 14 and 16, protects the set screws 24 and 30, and affords a convenient handle for holding the tool. It may also be used without removing the primary and secondary beams from the holder, as a guide when marking lines on timbers to be out on an angle,

While I have shown and described the preferred construction, combination and arrangement of parts constituting the instru- In combination, a primary beam suitably graduated and provided along one margm With a longitudinal flange, a graduated blade pivotally connected to one end of said primary beam, a graduated secondary beam, and a holder consisting of a leg having a longitudinal passage enclosed on four sides for thereceptionof said secondary beam, a second leg extending at right angles from the first-mentioned leg and having a longitudinal slideway for the primary beam, one side of said slideway engaging over and terminatingjust above the flange of the primary beam in order to display the graduations upon the latter, means threadedfin the legsfor securing the respective beamsat any point of their adjustment, and a'miter member secured to said legs.

In testimony whereof I aflix my signature.

CHARLES W. LINTNER.

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