US2942634A - Mitering device - Google Patents

Description

June 28, 1960 Filed Aug. 26, 1958 Fla L J. D. GATHERCOAL 2,942,6 34

MITERING DEVICE 2 Sheets-Sheet 1 i In.

BY v

CZiz or 65/5 June 28, 1960 J. D. GATHERCOAL 2,942,534

MITERING DEVICE 1 Filed Aug. 26, 1958 2 Sheets-Sheet 2 "may 7 I 15 u mi.

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IN VEN TOR.

iseph Q Gazhercoal Y nite rates This invention relates to a mitering device and particularly to a small compact mitering device for guiding a cutting blade to cut at a predetermined angle.

It is one object of my invention to provide a small, compact and extremely portable device which accurately holds a surface for guiding the blade of a cutting tool.

It is another object of my invention to provide a mitering device which is adjustable to various preset angles and which holds the angles securely by a wear-resisting connection so that play between a work-engaging member and an angle-holding member of the device is not encountered even after long periods of use.

It is another object of my invention to provide a small compact mitering device which engages work firmly and which holds the blade guiding surface not only at the appropriate angle with relation to the edge of the work, but also perpendicular to the surface that the blade is cutting.

It is another object of my invention to provide a mitering device-which quickly and accurately adjusts to a preset angle in either direction.

Other objects and advantages of this invention will be apparent from the following description and the accompanying drawings in which similar characters of reference indicate similar parts throughout the several views.

Referring to the two sheets of drawings:

Fig. 1 is an isometric view of the device of my invention;

Fig. 2 is an elevational view of the assembly;

Fig. 3 is an isometric view of the work-engaging member of the assembly;

Fig. 4 is a plan view of the angle-holding member of the assembly;

Fig. 5 is a sectional view of Fig. 4 taken along line 5-5;

Fig. 6 is a sectional view of Fig. 4 taken along the line 6-6;

Fig. 7 is an enlarged isometric view of a tongue which may be used in this assembly; and

Fig. 8 is an elevation view of the assembly positioned to change the angle at which the blade guiding surface is held.

Fig. 1 illustrates various parts of the device positioned so that blade-guiding member 13 is at 45 degrees to workengaging member 10 and is held fixed in this position by angleholding member 12. Angle-holding member 12 is adapted with grooves for engaging a tongue which protrudes from the upper surface 24 of work-engaging member 10. It is illustrated in this view that blade-guiding member 13 protrudes beneath angle-holding member 12 the distance X which distance is equal to the thickness of the cross bar portion 15 of T-shaped work-engaging member 10. Therefore, the bottom edge of blade-guiding member 13 lies in the same plane as the lower surface 25 of T-shaped work-engaging member 10. By establishing these dimensions as here indicated, the work is en gaged without wobbling by the extended length of member 13, and in addition the blade guiding surface of member 13 is held perpendicular to the plane of the surface that is being cut. Thus, not only is the cut made at the proper angle with regard to the edge of the work but it is a square cut made perpendicularly through the top surface of the work.

In Fig. 2 there is illustrated one mode of maintaining the various members of the assembly in proper contact with each other. Pin 17 passes from the top of angleholding members 12 completely through pin-receiving recess 18 in that member and into pin-receiving recess 22 of work-engaging member 119. The pin is preferably securely fixed in recess 22. A spring 20 is disposed in spring-receiving recess 19 and a large head on pin 17 maintains spring 21 in the recess and compressed. It is preferred that pin-receiving recess 22 is disposed immediately above the leg portion 14 of T-shaped member 10 and close to its edge so that the edge of cross bar 15 may act as a fulcrum for compressing spring 20 when angleholding member 12 is tilted.

Fig. 3 is an isometric view of work engaging member 10 illustrating tongue member 11 protruding from the. fiat upper surface 24 of work-engaging member 10. Flat. upper surface 24 engages fiat lower end surface 23 of" angle-holding member 12 and is parallel to the flat under surfaces 25 of the cross bar 15. These surfaces are both;

perpendicular to the side surfaces of leg 14. The upper portion of tongue 11, as illustrated in Fig. 7, may be tapered to facilitate engaging groove 16. However, it is. preferred that groove 16 be square to avoid the possibility of wobbling or play in the connection between the; two. The dimension Y in tongue 11 is substantially the dimension Y of groove 16 with only suflicient difference to facilitate entry of the tongue in the groove without play. The elongated contact of tongue 11 in groove 16 provides an extremely stable engagement of the two which holds the work without wobbling or play and which endures many years of use without sufficient wear to produce a noticeable amount of play in the joint.

Figs. 4, 5 and 6 are various views of angle-holding member 12 and illustrate that angle-holding member 12 contains a flat end surface 23, a flat edge surface 22 which is perpendicular to surface 23, and a plurality of grooves 16 set at predetermined angles to flat edge surface 22 and radial to hole 18. In this embodiment, grooves 16 are disposed to hold angles of 45 degrees in either direction and degrees. However, it is of course obvious that 60 degrees, 30 degrees, 22% degrees or any other angles may be held by simply supplying the desired number of grooves at the proper angles. enough to permit tongue 11 to enter completely so that surfaces 23 and 24 are in contact and, preferably, grooves 16 are enough deeper than tongue 11 is high to provide ample clearance for dirt or particles of wood or the like. When grooves 16 are cut to be mirror images of each other about a line passing through the center of hole 18 and perpendicular to edge surface 22, the blade-guiding member 13 will be adjustable to the same angle in. either direction thereby greatly faciliating mitering open ations. As herein illustrated, tongue 11 may be trapezoidal and assembled so that it tapers to a lesser height above surface 24 as it approaches hole 22. As illustrated in Fig. 8, the trapezoidal shape of tongue 11 reduces thev distance that angle-holding member 12 need be tipped to.

change its position, but it does not diminish the holding quality of the connection between tongue 11 and any groove 16.

angle being held, angle-holding member 12 is bent back Grooves 16 should be deep a I mammal,

across the edge'ofcross bar 15 thereby raising surface 23 out of'contact with surface 24. Simultaneously, groove 16 is lifted completely above tongue 11 and angle-holding memberlz is free to pivot onpin 17. In the, tilted posi;

i ine ii s es dt ea r en ndrunnarfi r v l i sfi i n -ba n member 12 wi sss ,3 an 1' a 24 ar s l' i Z r qw ta withsa h h n i When tongue 1-1 and one -of grooves1 are coincident,

they,wil l ,i 1terloclg and hold anglel-hdlding,member.'12,

and work-engagingtmember IGinfiXedp SitiC-nrelative 10 to each other as illu strated -in Fig, 2; l t

Althoughthe miterin'g deviceof my invention contains as essential elements aworli-engaging member, an angleholding member a blade-gu dingmember and a spring loaded means for holding the work-engaging member and' angle-holding members tegether in rotatable perpendicular relationship' with tongue-and-groove interlocking;

means for holding them inp redetermined' angular rela tionsh-ips; mam/ modifications of this invention are possible within its broad scope. Typical of these but not all inclusive are grooves at difierent angles or at more angles 7 than-those pictured,indicia marked on theangle-holding 7 member to indicate the angle of the blade-guiding surface,

different spring loaded devices for holding surfaces23 r andZ't gethe 'fOrming angle-holding member 12 and 25 blade-guiding member 13 integral as'a single piece, means integral with blade guiding member 13 for holding ablade orfor specially-adapting it to specific saws, etc; This'device may be made of any suitable materialincluding wood, iron, aluminum, plastic, alloys or any mixtures of these; p t

"It is understood that the foregoingdescription is merely illustrative of; a preferred embodiment of the invention and thatthe scope of the invention is not tobe limited thereto 'but is tc be determined by the appended'claims.-35

I claim z- V t l. A mitering device csmprising in combination aworl; engaging member'having'a T-shaped cross section and a tongue extending lengitudinally thereof andprotrudingl;

from Lhe top surface of the cross bar of said T-shaped 40 memben'anangle helding member having a flat end sur- 7 face anda fiatedgesurface perpendicular'to said end" surface, a first hole drilled through said flat end surface, a larger hole than said'first hole drilled coaxial with member and with said flat edge surface held remote from said work engaging member; grooves cut in the flat end "surface of said angle holding memben-said grooves being radial to said first hole at predetermined angles with respect to said fiat-edgesurface-Iandof'substantially thesame widthfas said tongue andselectively receiving said tongue, and a blade guiding member attached to said edge surface protrudingibelow: saidi flat:en 1' surface a distance equal to the thickness of the crossbar of said T-shaped member and said pin having a shank enough smaller in diameter than said first hole and ,a head enough smaller in diameter thamsaid coaxial hole topermitsaid angle holding membertorbe tilted; by' compressing said spring 7 and tiltingtheaxis. of :said holes enough out-of parallel relationship with the QXiSVOfISZid pin to permit the bottom surface OfLSfildL angle holding membervto'clear said tongue. V r J 2. The miteringdevice of claim 1 further characterized in that said tongue slopes towards the pin-receiving recess of'said work-engaging member,

f3 vThe miteringdeviceof-clalm 1 further characterizedinthatsaid grooves are deeper than the distance that said.

tongue extends above said work-engaging member.

4. The mitering device of claim l further characterized in ,that said grooves are cut in said angleholdingmember. to bje mirror images aboutjaline perpendicular-to said. fiat;edge surface and p assing through the center. of said pimreceiving recess:

-Reference5Ciicd in thqfilc bithis patent V UNITED I STATES PATENTS- 727,820 May Y May 12, 1903' 952,270 Milks, Mar. 15, 1910 965785 Wilson July 26; 1910f 1 843:,2'67 Burdick 'Feb. 2, l932 2,435,225" Kolodneret a1; ,Feb. 3, 1948 2.742.936 Cooley Apr. 1956

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