US2602474A - Radial arm miter saw - Google Patents

Description

y 1952 w. TRUCHAN 2,602,474

RADIAL ARM METER SAW Filed June 14, 1950 F I 3.2 INVENTOR.

flW/Mm 2mm v Patented July 8, 1952 UNITED STATES PATENT OFFICE a i .igizie su' :QRADIALYARMMITER sAw ff I I Vll ill ian1;'l i'uc han, Berkeley, Calif. Application time 14, 1950, 'SeriabNo; 163,990

frame is provided enabling such a portable elec'-" tricsaw to be utilized'as a stationary structure whereby the accuracy of the saw cut is improved.

Another object of the-presentinvention is to provide a construction utilizing a portable electric saw to provide a structure which can be utilized in place of the more expensive saws presently available.

The-invention includes other objects and features of advantage, some of which,together with the foregoing will appear hereinafter wherein'the present preferred form of the construction embodying this invention is disclosed.

In the drawing accompanying and forming a part hereof, Figure 1 is a perspective view illustrating a form of the construction embodying the present invention.

Figure 2 is a section taken along the line 2-2 in Figure 1.

Figure 3 is a detail view showingthe flexible connection 48 about the switch 41. 7

Referring to the structure particularly shown in Figure l, a suitable supporting planar base 6 is generally provided and which may be made up of a suitable frame or base structure as desired. Mounted upon this is a pedestal, generally indicated at 1, comprising a footed-base B secured to the base 6 by screws 9 and having spaced vertical uprights l I. These carry a horizontal support l2 having a central annular portion It. A circular cap or cover i4 is mounted rotatably upon the annular portion It. A stud 26 is secured in the annular portion l6 and extends up through an aperture in the circular cover [4, nut 21 on the stud being secured upon a handle 28. The periphery of the annular cover [4 is marked off in degrees, as is indicated at 29 in Figure 1, so that, by reference to a zero mark 31 provided upon base l2, the position of the frame 24 with respect to the base can be altered and adjusted as desired by loosening the engagement of cover l4 and its support by suit- 3 c aims. (01. Ma -s )1 ably moving handle 28, adjusting the cover and then tightening the cover by moving handle-28. Secured on opposite sides of the circular cover l4 in a parallel relation are two U-shaped members generally indicated at IT; each member having afirstroller [amounted at the rear thereof and a second roller 19 mounted at the forward end thereof. A rail 2! is extended through and is supported by the rollers in each of the U- shaped frame members I! and includes a stop 22 at the rear end thereof to limit travel of the rail' -onthe rollers- The rails extend forwardly and-are engaged by a -Umember 23 toprovide a horizontal frame generally indicated at 24 and whichframe sis superimposed over thebase 6 in a parallel and spacedrelation. It will be obvious that a roller l8 engages the; upper side of e'achrail 2| while roller I9 engages the lower side thereof to support the rail for a sliding-movement across basefi'... f=- V The-frame 24 includes at its forward end a vertical tubular standard 32, acolu'mn 33 being slidably mountedtherein. The column includes suitable horizontal. circular grooves (not shown) providing a rack which is engaged by a gear (not shown), the gear being rotated by crank 34 to raise and lower the column in the standard, as desired. The standard is split as at 36 and its portions can be drawn into frictional engagement with the column 33by rotation of crank 31 which extends through the ears provided upon opposite sides of the split 36.

At the lower end of column 33 is provided a horizontal frame 4] having a threaded rod 42 providing a hinge support for an electric saw structure generally indicated at 43 and which includes an electric motor, generally indicated at 44, supplied with power through cable 46 under the control of a switch generally indicated at 41. A flexible connection such as chain 48 extends between handle 49 and the saw and an eye 5! on the standard 32. Normally the flexible connection 48 passes about the switch 41, the latter being pressure-operated so that the weight of the saw about its hinge mounting on rod 42 is willcient to maintain the switch closed and the electric motor energized.

a plate 58 hinged on the rod 42 and secured ad-" justably with respect to'the electric saw by a bracket 59 provided at oneend thereof and an extension (H on handle 49, the two being adjust- 3 ably secured together by a wing nut and bolt generally' indicated at 62. If desired, the footed portion 8 of the frame 1 can be suitably covered by plywood or the like so that a smooth, even and uninterrupted work surface is provided except for the columns I l.

In operation, with the frame 24 in a desired position of adjustment with respect to the base 6 and with a piece of work in position, the saw can be readily moved across the work by movement of the rails '21 in the rollers 18 and 19. If desired, the rails 2| can be locked in position as by lock screws 62 extending from the frame I! to engage the rails to lock these against sliding movement. In this case, the work must be moved past the saw.

To permit boards of relatively-greatlength.-to be cut, the saw can be turned at 180 in that position in which it is shown in Figure 1, the teeth of the rack on column 33 being provided completely around-the column 33 so that the saw can 'be-"swunginto any position with respectto the'frameifl by rotating column 33 intstandard-32l I "From theforegoing, I [believe it will be apparent'that I have provided a relatively novel, simple, inexpensive and yet ruggedand'accurate frame construction 'forproviding a simple. and inexpensive saw.

- I claim: 7

1. A device of the-character described comprisilflg a flat horizontal base, a pedestal secured to said base and'extending vertically from saidbase, ahorizontal framesupported at one endonsaid pedestal ina' fixed parallel relation to said base and superimposed thereover, said horizontal frameincluding two parallel spaced horizontal rails,-:a carriage mounted 'slidably on'saidrails, avertical-tu bular standard mounted at one end of said carriage, a column slidably mounted in said tubularstandard, an electric-motor having a shaft carrying-a saw, means hinging the electric motor "and saw on said column, said electric motor-including a-hand'grip thereof for moving the motor and saw as desired, said grip including an electric switch :having an exposed pressure 4 operated control element, and a flexible support extended between said column and about said grip, including said pressure operated element, to support said electric motor for only a limited hinged movement.

2. A device of the character described comprising a flat horizontal base, a pedestal secured to said base and extending vertically from said base, a horizontal frame supported on said pedestal in afix'ed parallel relation to said base and superimposed thereover, said horizontal frame including two U-shaped frame members mounted in a parallel and fixed relation on said horizontal frame,-=a- U-shaped carriage includin two parallel spaced horizontal rails, a first roller mounted 'at' the rear *ofeach U-shaped frame member and engaged with theupper side of a rail, a second roller mounted in each U-shaped frame member at the other end thereof and engaged with the under side of a rail,,a vertical tubular standard mounted on the cross leg of'said U-shaped carriage, acolumn slidably mounted insaid tubular standard, an electric motor having a shaft carrying-a saw, and means hinging the electric motor and saw on'said'column. V

-3.'-A- device as inclaim Z-Where'in the electric motor has a hand grip mounted thereon for moving the-motor and saw as desired, said grip including an-electric switch having an exposed pressureoperated control element, and a flexible support extended between said column and about said grip, including said pressure operated element, -to support said electric motor for only -a limited hinged movement.

WILLIAM TRUCHAN.

-REFERENCES CITED c The'fdllowing references'are of record in the file of this patent;

UNITED STATES PATENTS

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