US1864634A - Saw gauge - Google Patents

Description

June 28, 1932. VT. 1 BRADFORD I 1,864,634

SAW GAUGE Filed Nov. 27, 1929 l x l" M im Wlfflllwf Patented June 28, 1932 's UNITED ls'r-A-TlasA PATENT OFFICE THOLVIAS J. BRADFORD, OF COTTAGE GROVE, OREGON, ASSIGNOR F TWO-FIFTHS TO EMMITT SHARP, 0F COTTAGE GROVE, OREGON SAW GAUGE Application led November 27, 1929. Serial No. 410,159.

My present invention vhas reference to a gauge for gauging the pitch or swage of the teeth of saws, and my object is the provision of a gauge to be used in the sharpening of 1 cross cut saws and which will accurately and which is characterized by simplicity in con struction, cheapness in manufacture and ease and accuracy in operation.

To the attainment of the foregoing and other objects which will present themselves, Y 5 the improvement resides in certain other novel features of construction, combination and operative association of parts, one satisfactory embodiment of which is illustrated by the accompanying drawing.

In the drawing:

Figure 1 is atop plan view of a saw tooth gauge in accordance with this invention, the front plate for the top thereof being removed.

Figure 2 is a sectional view on the line 2--2 of Figure 1.

Figure 3 is a detail horizontal sectional view approximately on the line 3-3 of Figure 2.

My improvement contemplates the employment of a preferably metal casing whose rear portion describes a cylinder 1 and whose forward portion 2 is of a' less width thanthe rear 1 and has its sides converging toward its outer rounded end. Fixed to the flat bottom of the cylindrical portion 1 there are spaced legs 3 which rest upon the saw 4 whose teeth are to be gauged. The reduced and neck portion 2of the cylinder, adjacent to the front end thereof has passed through a suitable opening in its bottom a pin 5 that provides the micrometer actuator. The pin at its top is formed with a head 6' and the inner corner of the said head is beveled, as at 7. The pin has a reduced portion 8 in which is received the offset end provided atthe lower portion with a bent plate which I will term a post. The part 9 of the post 10 limits both the upward and outward movement of the pin 5. The inner and upper end of the post is also formed with an angle extension 12,

Y tinction which has its outer end concaved, as at 11, to receive therein and aord a guide for the pin 5. Also the lower arm or extension k9 of the post has its end conca-ved and is in contact with the reduced portion 8 of the pin and thus serves as an additional guide for the said pin. The top of the bent plate whichl have termed the post 10 is formed with a depressed rounded portion 13 and is provided with ears 14 at the ends of the said depressed portions. The depressed portion 13 afords a seatfor a substantially U-shaped part or eye 15 on a tiltable arm 16. The arm -is in the nature of a plateand the rear thereof is disposed at an angle with respect to the eye 15 thereof and the forward portion above the eye is preferably thickened, as at 17 ,Y and rests directly upon the head 6, adjacent to the beveled corner thereof.

The angle end of the arm 16 merges into a round portion or eye 18 which is engaged by Similar round portions or eyes 19 on the end of a bar 20. The spaced eyes 19 are preferably connected at their lower portions to the plate by a transverse part 21 and there is passed through the alining eyes a pivot 22; The bar passes through the dividing wall between the cylindrical portion 1 and the nose extension 2 of the casing, and the rear portion of the bar 20 is given a half twist so that its said rear portion will be disposed over the flat bottom of the part 1 of the casing. This flat portion is indicated for disby the numeral 23 and is formed on one of its ed es with rack teeth 24 and is guided below a nger 25 provided on one end of a bearing plate 26 which is fixed by an element 27 to the bottom of the cylindrical portion of the casing. The element 27 is preferably in the nature of a bolt or screw and holds thereon one end of a coil spring 28 whose second end is fixed to the flat portion 21 of the bar 20. There is journaled in the bearing plate 26 and also journaled through the top ofthe part 1 of the'casing a shaft or arbor 29'that has fixed thereon and arranged between upper and lower flanges 30, respectively a toothed wheel or pinion V31 that is in mesh with a rack 24. The top of the shaft or arbor has fixed thereto a pointer 32 and the top 33 and the cylindrical portion l of the casing has inscribed thereon a dial 34 over which the pointer 32 moves. The top 33 is preferably of colored glass, but the characters on the dial 34 are painted to render the same clearly discernible. Both the top of the part 1 of the casing as well as the pointer 32 may be received under 'a transparent disc (not shown). Y The improvement as disclosed by Fig-ure 2 of the drawing is arranged upon the saw 4 so that the micrometer actuator or pin 5 is arranged over the outer edges of the teeth of the cylinder. By movi-ng the casing alo-ng the saw the pin 5 will be brought against the several teeth of the saw and any inaccuracies with respect to the pitch of the teeth will be duly recorded on the dial. It will be apparent that any upward movement of the pin will cause the angle end of the arm 16 to swing in the direction of the post l0. This will impart a longitudinal as well as a partial swinging to the bar 2O and such movement will, of course,'cause the rack thereof to impart a lturning movement to the shaft or aror v29, which causesvr the pointer to travel Vvover the dial.

Obviously the graduations on the dial may Abe inscribed to permit of the gauge registering a fine and coarse adjustment, and the construction and advantages of the improve- Vment will, it is thought, be understood and appreciated by those skilled in the art .to which such invention relates without Vfurther detailed description.

YHaving described the invention, I claim:

l. A saw tooth gauge comprising .a long casi-ng having depending foot portions thereon to travel over the flat face of a saw and having a pin movable through the bottom .adjacent to one end thereof for travel .over the in the casing and having a portion which overlies the beveled edge of the head, a pointer over the dial, an arbor for the pointer, and means actuated by the inward movement of the pin and the swinging of the pivoted member for turning the arbor and pointer, said means including a bar which is pivoted to the end of the fulcrumed member and which is given a half twist to provide a straight extension .that has one edge formed with teeth, a pinion on the arbor to engage with the teeth, a guide for the toothed end of the bar, and a spring for swinging the bar tov Acause the toothed end thereof to engage with the pinion.

In testimony whereof I aiiiX -mv lsignature.

THOMAS J. BRA'DFoRD.

teeth of the saw, means limiting the movement of the pin in two directions .and aswngable arm actuated by the movement of the pin, a bar pivotally secured to the arm and having a right angle twisted portion,'a rack on one of the edges of the said twisted portion,` said casing having a dial, `a pointer movable over the dial, an arbor for the pointer and journaled in the casing, a pinion on the arbor, flanged elements on the arbor at `the opposite sides of the pinion and receiving the rack of the bar therebetween, and spring means influencing the rack to engage with the pinion. Y

2. A saw tooth gauge comprising a casing having upper and lower flat faces, a gauge on the upper face of the casing and said casing having depending foot portions on its lower face to travel over the flat side of a saw, a pin movable through the lower face of the casing, means in the casing providing a dial and a stop for limiting the movement of the pin in two vertical directions, ahead on the inner end of the pin and'havi-ng a beveled edge, a pivoted member fulcrumed

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