US 2572326 A
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Oct. 23, 1951 M. c. EVANS CIRCULAR SAW GUARD Filed June 24, 1949 CM Mm i WM mm We W V m Patented Oct. 23, 1951 CIRCULAR SAW GUARD Mervyn Camille Evans, Stanmore, near Sydney, New South Wales, Australia Application June 24, 1949, Serial No. 120,996
, In Australia July 12, 1948 This invention relates to improvements in circular saw guards. v
Said improved circular saw guard has at its forward portion pivotal means to which is pivoted one end of a link, the latter being also pivotally connected at itsother end to stationary means on a saw bench, whereby when a work piece is being fed to the forward end of the guard the said link will be tilted to lift :the'forward end of the guard by the pivoting on said pivotal connections of said link and guard until the guard is in balanced position to lie on the top of the work piece, and when said balanced position is passed the link and the forward part of the guard will be allowed to descend to the upper surface of the table of the saw bench, and when the work piece has been fed from beneath the rear end of the guard the latter end of the guard will descend to the upper surface of the table of the saw bench, so that the guard will completely cover the portion of the circular saw projecting above the upper surface of the table of the saw bench.
Other features of the invention are hereinafter referred to.
The invention will be described further in detail and by way of example with reference to the accompanying drawings, in which:
Fig. 1 is a perspective view of a saw guard according to the invention shown applied to the table of a saw bench; and
Fig. 2 is a longitudinal sectional elevation through the saw guard.
The table I of a saw bench has secured thereto in any well known manner a circular saw blade 2. There is also secured to the table I a riving knif 3. The guard 4 can take over and cover the portion of the blade 2 which projects through a slot in the table I. Guard 4 consists of a semi-circular shaped hood 5 and a pair of spaced vertically disposed side walls 6, the latter bein disposed in parallelism with the blade 2. The bottom edges I of the side walls 6 are straight and are disposed in parallelism with the upper surface of the table I.
On the rear end of the guard 4 there may be a lug 8 to which is pivotally connectible one end of a vertically disposed radius arm I having an elongated slot II. Into the latter a fixed pin I2 projects, the pin I2 being mounted on one end of a horizontal limb I3 of a bracket I4 which is suitably mounted on the upper surface of the table I.
Medially disposed of the length of the guard 4 and near the bottom of each of the side walls 6 is a trunnion pin I6. Pivotally mounted on the trunnion pins I6 is a saddle I'I Whose top is con- 2 Claims.- (Cl. 143-159) nectible to one end of a wire rope I 8 which passes over a pair of spaced rotatable sheaves I9 and 20 mounted in a bracket 2| which is associated with the bracket I4. The other end of the rope I8 is shown connected to a counterweight 22 to permit weight balancing of the guard 4 while also allowing the latter to swing in the saddle IT. The latter can slide upwardly and downwardly within the vertically disposed U-shaped gap 23 in the bracket The forward end of the guard 4 has affixed on each side wall 6 a trunnion pin 25. To the pins 25 is pivotally connected one end of a bifurcated link 26, whose other end is pivotally connected to a second horizontal limb 21 associated with the bracket I4. The forward end of the guard 4 is curvedly nosed as at 28.
-In operation, bottom edges 1 of the walls 6 of the guard 4 normally rest on the table I. As a work piece 30 is fed along the table I to abut the forward end of the guard 4, such piece 30 engages with the link 26, whereby the forward end of the guard 4 is raised, thereby allowing the work piece 30 to contact the saw blade 2. As the work piece 30 is fed forwardly on the table I the guard 4 is radially raised (see dotted position A Fig. 2) until the leading end 3| of the work piece 30 almost reaches beneath the bottom of the saddle I1. On the end 3| of the work piece 30 passing beyond the saddle H, the bottom edges 1 of the forward end of the walls 6 of the guard 4 will rest upon the upper surface of the work piece 30.
As the rear end 32 of the work piece 30 passes from underneath the saddle I I, the guard 4 will automatically tilt on the pins I6 (see dotted position B Fig. 2), whereby the link 26 and the forward end of the guard 4 will rest upon the upper surface of the table I, thereby allowing the adjacent portion of the saw blade 2 to be covered by the guard 4 and guarded from contact by a person.
When the work piece 30 passes from underneath the guard 4, the latter will automatically resume normal position thereof completely over the saw blade and on the upper surface of the table I.
What I claim as my invention and desire to secure by Letters Patent is:
l. A circular saw guard to be mounted on a saw bench and including a semicircular shaped hood and a pair of spaced vertically disposed side walls integral therewith, said walls being disposed in parallelism with the blade of the saw, and the bottom edges of said side wall being straight and disposed normally in parallelism with the upper surface of said saw bench and having at the forward portion thereof pivotal means, a link, one end of which is pivoted thereto, stationary means to which the link is pivotally connected at its other end, said stationary means being located on said saw bench, said guard also including ri-vring :kniie secured -.to the top .of said saw bench and "disposed between said side walls adjacent the rear end portion thereof, and said guard also including at the rear end thereof a lug, said stationary means including a horizontal limb, a fixed pin mounted on one end of said horizontal limb, and a vertically disposed radius arm having on one end portion an elongated slot into which said fixed pin slidably fits, and the other end being pivot-ally secured to said lug whereby when a work piece is'being fed to the forward end of the guard, said link will Kbe tilted to lift the forward end of the guard by thepivoting ion the pivotal connection of said link and guard, until the guard is in balanced position tolie on the top=of the work ;-piece,, rand when said ibalanced'position-is passed, the link and .the forward part -of the guard will be tal- .lowcd to descend :to the upper surface of said 25 -saw bench, and when the workpiece has :been led from beneath the rearend of the guard the latter end of the guard 'wil descend to the upper surface of said saw bench, so that the guard will completely cover the portion of the circular saw projecting above the upper surface of said bench.
2. A circular saw guard according to claim 7, including a trunnion pin mounted on each of said walls medially of the length of said walls and adjacent the bottom edge thereof, a saddle pivotlally mounted on said 4911 15, :spaced sheaves rotatably mounted on saidsstationarymeans, a rope passing over said sheaves and having one end connected to the top of said saddle, and a. counterweight carried by the other end of said rope', bal-'ance the weight of the guard, while also allowing it toswing in said saddle.
MERVYN CAMILIE EVANS.
:REEERENCES CITED The following references are of record in the file of patent:
UNITED STATES PATENTS