US1691118A - Miter square - Google Patents

Description

Nov. 13, 1912s. y 1,691,118A

W. LISSY MITER SQUARE Filed Dec. 2l, 1925 un l Patente-d Nov. 13, '1928.

"unire s'rnree MITER S QUARE.

Application filed December 21, i925. No 'IG My present invention relutee to improvements in initier sqruires of the straight edge type comprising-Jl e stock und ufpivoteiil, slidable, and detachable blade "hereby the bl d und stock muy be errang-ed et various ongle, es e single struight edge ruler or the parte alined es u inerler. The insruinent is ca,- peble of adjustment on its pivot zit various :ingles for use in co-operntion with rfi-dini nier rings ne u initer square; it muy With 'lucility be arranged for use in co-ouerution Wi 'h pencil for u inni-lier Within d gree of din'iensions; end in addition to its ueY es n single straight edge or ruler the instruinent inny readily be converted into e trysquare.

The invent-ion consists in certain novel coinbinutions end arrangements of ports Wherebythe instrument may readily be adapted for the above und other uses, ne will hereinafter be more fully pointed outv end oloiined.

In the accompanying drawings l have illustrated several uses oi the instrument in which the physical embodiment of the invent-ion shows the combinations and arrangements of perte: eccordingl to the best inode l have thus ier devised for the practical application of the principles of niy invention.

Figure l is a perspective view oit the instruinent used us e initer square. Figure 2 is e perspective view o1 the instrument used is e nnlrler. Figure 8 is e plen view of the instrument converted into u Straight edge, und in dotted lines shown es e. tnv-square. Figure l is un enlarged detail sectional vieiv 'teken transversely through the center of Fig. 2 at the pivot bolt.

In carrying` out my invention li utilize a lstock l in the forni of e Wooden ber, rectangular in cross sect-ion end preferably provided with inetnl edges and corners 2. In the upper fece of the stock is feshioned n longitudinally extending' slot 3 benezirh which ie in undercut groove 4l.

ln connection with the stock i utilize e detachable blade 5 capable of being' arranged in various relations to the Steeb: end preferably of Wood with motel edges une corners G.

An interchungeeble bolt 7 is used neer one end oi the blade7 which bolt projects beloiv its under surface and the projectingl end oit' the bolt ie fashioned With e, non-rotatable hee d 8 which is retained end ndeilited to slide in the undercut groove 4l While the bolt travels through the slot 3.

A clamp nurJ 9 is used on the bolt end prow der vided with o heed l0 r'ushioned for conxf'enience of the thumb und linger in turning it.

fr snirit level 1,4- is set in the stoel: between l. one oit ite edges und the control longitudinal slotn 3 for use in the usuel innnner.

ln liieurn l and the instrument ie illus- 'tinted lier use :ie e imiter squere and es e Inerlrer 1espectivelyln the lirst instance the blade muy with facility be adjusted on its pivot to the desired ongle coiirlorining)i te one of the radial lines on the fece of the stock and clamped in such position by ineens of the nut 9. There :ire tivo oppoeitely arranged radial scales, one et euch side of the longitudinal center oi' the stockD und the blade may be shifted to either oi these scales end adjusted to e desired ongle.

ln Figure tlie instrument is used as e innrlzer in connection with e. pencil P for inzulringon n bor-.rd er plank ne B. For this purpose 'the blude is turned on its pivot perullel With the xstock end the blade is then ndjusted longitudinally ol the slot to project beyond the end of the stoel; the desired distence indicated on the scales along; the sides of edges of the blede. The end of the stocl and the underfnce of the projecting end ol the blu de thus forni :in :iccurutc end Stable guide, after the nut 9 has been clamped tight, for the pencil P.

ln addition to these uees the instrument is edupted for use es e single elruigjht edge :is in full linee Figure 3, or try square ne indicated by the dotted lines for the blede in seid tiefere. For this purpose tbe blede is provided with e` loi y tudinfilly extending bolt l5 its end oppos te to the pivotal end of the blade. end the belly Sei A.ed `in e longitud' inlly extending1 einen o; in one end of the blade. The bolt is ehi-oued with un inicl.eral T-heod l@ which is norinellv retracted in e socket l? in the end oi the blo. de es seen in Fie'. l.

This T-heed of the bolt is adapted to selectively engage either crose groove 18 fashioned at the end of the stock when the instruinent is used as a ruler or straight edge, or the head may engage a longitudinally extending socket 19 near the opposite end of the stock and locatedfin one of itsside edges.

A usual ela-mp nut 2O is provided for the bolt 15 for locking the bolt in position.

The T-head makes aV tight :trictional engagenient and close fit With the Walls of the cross groove 18 or the Walls of the socket 19v of the stock. Thus when used as a single straight edge or ruler as 1n full lines Figure y 3 the blade and stock are lirst disconnected i at their pivotal points,

and then the T-head is loosened by unscreiving the nut 20. The T-head is then slid :troni one side into the groove 18 and the blade is thus brought into alinernent with the stock and the parts are clamped together by turning nut 20.

When used as a try-square as indicated by dotted lines in Figure 3, the detached blade is turned at right angles to the stock and the projected T-head of the boltis first slid into the open end of slot 19 and then forced into rictional contact with the Walls of this longitudinally extending groove 19 of the stock by turning` tbe nut- 20.

It Will be apparent thatJ various other ad-` justments and uses inay be devised for the instrument by those familiar with carpentry vand like trades.

WiLLIAM Lrssv.

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