US2125371A

US2125371A - Shingle mill

Info

Publication number: US2125371A
Application number: US98486A
Authority: US
Inventors: Edward S Field
Original assignee: Individual
Current assignee: Individual
Priority date: 1936-08-29
Filing date: 1936-08-29
Publication date: 1938-08-02
Anticipated expiration: 1955-08-02

Description

Allg. 2, E HELD 2,125,371

SHINGLE MILL Filed Aug. 29. 1936 5 Sheets-Shee1l l INVENTORA FDW/,wp 5. H540 BY r/zJ ATTORNEYS ug 2, 1938- E. s. FIELD 2,125,371

SHNGLE MILL Filed Aug. 29, 1956 3 Sheets-Sheet 2 INVENTOR. EWf/f 5. Hap

ATTORNEYS Aug., 2, 193.8.

E. S. FIELD SHINGLE MILL Filed Aug. 29. 1956 3 Sheets-Sheet 3 Imnnnnun.n.nnnnnmnnnnnnnnnnnnnnnr INVENTOR.

ATTORNEYS Patented Aug. 2, 1938 UNITED STATES PATENT OFFICE 6 Claims.

This invention relates to saw mills, and particularly the portion thereof adapted to carry the block being sawed, and mechanism thereon for progressively advancing said block toward the saw as strips are taken therefrom, and the primary object of the invention is the provision of improved mechanism for alternately advancing rst one end of the block, then the other, for the purpose of producing shingles.

One of the important aims of the instant invention is to provide unique manually operable mechanism for shingle mills, which will serve to function with a block-carrying member in such manner as to alternately advance the ends thereof for the production of shingles as a lever of the mechanism is oscillated.

A still further object of the invention is the provision in block-advancing mechanism for saw mills, having uniquely disposed ratchet wheels, an operating lever, check paWls for the ratchet Wheels, dogs interconnecting the lever and ratchet wheels, and a throw-out member operable to render both the dogs and check pawls inoperative when the lever is moved to the extreme one end of its path of travel.

Minor objects of the invention will appear during the course of the following specification, referring to the accompanying drawings, wherein:

Figure 1 is a perspective view of a portion of a saw mill made in accordance with the present invention.

Fig. 2 is a top plan view of the mechanism, showing the block carried thereby in one position.

Fig. 3 is a similar View, illustrating the block shifted to another position.

Fig. 4 is an enlarged, fragmentary, side elevation of the operating lever and its associated 40, mechanism.

Fig. 5 is a vertical, condensed, central, sectlonal View, taken along line V-V of Fig. 4.

Fig. 6 is an enlarged, detailed, fragmentary, sectional view, taken along line VI-VI of Fig.

4,5` 4:, and,

Fig. 7 is a sectional View, taken along line VII-VII of Fig. 5.

The features of a saw mill embodying this invention are especially constructed for the pro- 50` duction of shingles, and the parts embodying the 'invention contribute in performing the function of alternately advancing the ends of the wooden block from which the shingles are cut. This action just mentioned and one manner of producing 55;;the same is shown and described in U. S. Letters Patent No. 1,316,555, issued September 23, 1919, to J. F. Bell.

The improvements contemplated by this invention and exemplied by the accompanying drawings attain the same result so far as the production of shingles is concerned, but in a more efcient and practical manner, and the manually operable mechanism comprises parts which render the saw mill easier to operate, more convenient to the operator, and speedier in the production of shingles.

In the drawings, wherein like reference characters designate similar parts throughout the several views, the numeral 8 indicates any suitable supporting frame, having bearings lil mounted therein to journal a mandrel or shaft I2 for supporting and driving saw I4. Tracks I6 and I8 are along the upper side of frame 8, and a horizontally shiftable frame 20 is movably mounted upon tracks I 6 and I8 through the medium of

wheels

22 and 24.

The first mentioned wheels 22 are annularly grooved, and preclude lateral displacement of frame 2i) as it is being shifted to and fro above frame 8. This movement on the part of frame 2E] may be imparted thereto either by manual manipulation thereof or through the use of suitable, vvell known mechanical means, not here shown. Such movement carries frame 2li past saw I4 and the Work of producing shingles is thereby assisted.

Frame 2l) should be constructed of metal or other suitable strong and rigid material, and a pair of parallel, longitudinally

slidable racks

26 and 28 are carried by frame 20 for rectilinear reciprocation in a direction transverse to the path of travel of frame 20. A block-carrying member or head 3i! is in connection with the ends of

racks

26 and 28 through the medium of

like bolts

32 and 34 and brace 36.

Bolts

32 and 34 establish a pivotal connection between head 3l) and the

respective racks

26 and 28, and the axis of rotation is a vertical one, always remaining in a line perpendicular to the horizontal planes of

racks

26 and 28.

Head 30 is especially formed to hold a block of wood 38 in a manner graphically illustrated in Figs. 2 and 3. The means for holding this block 38 for movement with head 38 comprises a pair of jaws 40, each having a bearing 42 in screw-threaded engagement with threaded shaft 44, which is journalled for rotation in bearings 4S. This shaft 44 has a suitable crank or similar means 48 so that it may be rotated in either direction for the purpose of moving jaws 4U toward and from each other and therefore to and from engagement with the ends of block 38. The inturned portions of jaws 4|] may be sharpened to grip the ends of block 33, if desired. A central bearing journals shaft 44 at a point intermediate its ends and the threads formed on shaft 44 are right and left screw threads, so that as shaft 44 is turned in one direction, jaws 4|) will be moved toward or from each other, depending upon the direction of rotation.

A spring 52 has one of its ends in connection with head 3|?. The other end of spring 52 is affixed to frame 20 and a constant pull is therefore exerted 'upon head 30 at all times. This pull is in a direction away from saw M and opposed to the direction of movement imparted to head 3G by the hereinafter described manually operable mechanism. An idler pinion 54, mounted upon shaft 55, is in mesh with rack 28, and pinion 58, mounted upon shaft 60 for rotation therewith is, in turn, in mesh with idler pinion 54. Shaft 6|] extends transversely across-above

racks

26 and 28, and is journalled in bearings E2, E4 and 66, all secured toframe 2G. Pinion 68 is in mesh with rack 2E and integral with inner ratchet wheel As Fig. 5 illustrates, pinion and ratchet wheel 63 and Hl are free to move about the axis of shaft 6i), yet are supported thereby so as to be in axial alignment with outer ratchet wheel i2, which is rigidly secured to shaft 50 through the medium of set screw or analogous means 1li. It will be observed from Fig. 1 that the teeth of ratchet wheel l@ are facing a direction opposite to the teeth of ratchet wheel 12, and that each ratchet wheel'lil and 'l2 is engaged by a yield-- able dog 'iii and 'I8 respectively, mounted upon lever 8U, that is freely carried by shaft 5i) for oscillation about its longitudinal axis. Springs 82 and |34.` urge dogs 76 and '|8 respectively into engagement with the teeth of ratchet wheels 'l0 and 'l2 respectively, as lever 8S is osciliated about the axis of shaft $0. Therefore, as lever 8i) is moved in one direction, one of the ratchet wheels will be driven, while the other is idle, and as lever 8D is moved in the opposite direction, the other ratchet will be driven as the remaining ratchet wheel is stationary. Trigger 85 engages behind heads formed on dogs 'i6 and 'l so that both of said dogs may be withdrawn from engagement with wheels 'ill and 'i2 when desired.

Check

pawls

85 and 88, supported by a bracket 90, mounted upon frame 2d, engage the teeth of v ratchet wheels 'lil and 'l2 respectively so as to limit their movement to but one direction. These check pawls have pins 92, extending inwardly toward each other for the hereinafter described purpose, and springs 9@ and 96 are associated with pawls '66 and 38 to yieldably maintain the same in engagement with the toothed peripheries of wheels FEB and l2 respectively.

Bracket S0 pivotally supports a throw-out element 98 of unique construction. The upper portion of this element is provided with a pair of opposed cam faces illil and |02, which terminate in notches |94 and |96 respectively. Laterally extending pins m8 and |||l are carried by dogs 15 and i8 respectively, and when lever t!) is moved to the extreme limit of its path of travel in one direction, thess pins |08 and engage cam faces im) and |02 and travel thereover to positions within notches Hifi and |66. The spring detent ||2 engages lever 8@ when the latter reaches the end of its path of travel and when the lever so engaged by detent ||2, lever 80 l which supports the adjustable screw |22.

will be in the position shown in dotted lines of Fig. and element 98 will be moved down around its pivotal connection H4 with bracket 90. Such movement carries tongue ||6 against pins 92 of check pawls 86 and S3 so that they too are moved to positions out of engagement with wheels 'IEB and i12 respectively. Thus the positioning of lever di? against movement at one end of its path of travel will completely disengage dogs 76 and 'i8 and pawls 86 and 88.

Means is provided for limiting the travel of leverV Bt, and since the amount of oscillation that can be imparted to lever 6i! determines the thickness of shingle being cut, this adjustment is a critical one and important. A segment ||8, carried by frame 2Q, provided with an ear |20 This ear and screw l2@ and |22 are in the path of travel of lever 80 and constitute a stop at one end of said path of travel. A block |24, s-lidably mounted upon segment H8, and having a laterally extending bolt i26 supported thereby, selectively forms the abutment for lever 3i] at the other end of its path of travel. This bolt |26 is secured in place cross bore |28, and block |213 is likewise rigidly fastened to segment ||8 by a set screw E32. Moving block |24 along segment H8 obviously will determine the length of the path of travel of lever Sil from bolt |26 to set screw |22. It is also clear that when it is desired to move lever 3|) into detent H2, bolt |26 may be quickly withdrawn from the path of travel of lever 8B.

Operation Head 35 must be advanced with each movement of lever 8d without backward travel. When lever 8i? is moved in the direction of the arrow in Fig. 2, inner ratchet wheel 'it is rotated about the axis of shaft di), pinion S8, integral with ratchet wheel lil, moves rack 26 forwardly so as to advance one end of head Sil to the position shown in dotted lines of Fig'. 2. Lever 8|) is then against bolt |25 and check pawl 85 is moved inwardly against one tooth of wheel lt. Frame 20 is then moved toward saw |4 and a shingle of the form indicated by dotted lines in Fig. 2 is cut from block 38.

Immediately thereafter lever St moved over against stop E22. Such movement does not disturb wheel '55, but rotates outer ratchet wheel 'l2 and, therewith, shaft pinion 58, and idler pinion 52. Such action moves rack 28 and therefore, head forwardly to the position shown in dotted lines of Fig. 3. Check pawl 88 has snapped into one of the teeth of wheel 'F2 and frame 20 is moved past saw |4 to cut from block 38 a shingle of the form shown in dotted lines of Fig. 3. Such action is repeated until all of block 38 has been cut away, and when block 38 has been reduced to a size where no longer can be advanced to be engaged by saw i4, lever 8G is moved to place behind detent H2, all means of holding wheels it and l2 are thereby released, and spring 52 draws head 3Q back to a point of beginning where another block may be attached thereto.

Having thus described the invention, what is claimed as new and desired to be secured by Letters Patent is:

l. In a shingle mill, having Va block-carrying member, a pair of parallel, longitudinally slidable racks pivotaily secured to the block-carrying member, feed mechanism comprising pinions in mesh with each rack respectively; a shaft extending across the pair of racks; .a pair of ratchet Cil Wheels mounted on said shaft adjacent one of said racks; a lever freely mounted on the shaft and oscillatable about the axis of the latter; and a pair of dogs carried by the lever in engagement with the ratchet wheels respectively to alternately drive the same when the lever is oscillated, one of said pinions being integral with one of said ratchet wheels and free to rotate about the shaft therewith as the lever1 is moved in one direction to drive the ratchet Wheel, the other of said ratchet wheels being secured to said shaft to rotate the same when the lever is moved in the other direction, the other of said pinions being secured to said shaft for rotation therewith, said last mentioned pinion having an idler pinion in mesh therewith and in mesh with the other of said racks.

2. In a shingle mill, having a block-carrying member, a pair of parallel, longitudinally slidable racks pivotally secured to the block-carrying member, feed mechanism comprising pinions in mesh with each rack respectively; a shaft extending across the pair of racks; a pair of ratchet wheels mounted on said shaft adjacent one of said racks; a lever freely mounted on the shaft and oscillatable about the axis of the latter; and a pair of dogs carried by the lever in engagement with the ratchet wheels respectively to alternately drive the same when the lever is oscillated, one of said pinions being integral with one of said ratchet wheels and free to rotate about the shaft therewith as the lever is moved in one direction to drive the ratchet Wheel, the other of said ratchet wheels being secured to said shaft to rotate the same when the lever is moved in the other direction, the other of said pinions being secured to said shaft for rotation therewith, said last mentioned pinion having an idler pinion in mesh therewith and in mesh with the other of said racks, the teeth of one ratchet wheel having their faces disposed in a direction opposite to the faces of the teeth of the other ratchet wheel to permit the dog of one ratchet wheel to ride thereover when the dog of the other ratchet wheel is serving to move its ratchet wheel.

3. In a mill of the character described, having a pair of parallel, longitudinally slidable racks, a' block-carrying member pivotally secured to each of said racks, and pinions in mesh with each of said racks respectively, feed mechanism for a1- ternately driving the pinions in the same direction to alternately advance the racks in the same direction, comprising ratchet wheels in connection with each pinion respectively, a lever oscillatable about the axis of said ratchet wheels, dogs carried by the lever in engagement with the ratchet wheels respectively to alternately rotate the ratchet wheels in opposite directions as the lever is oscillated, a pair of check pawls in engagement respectively with the ratchet wheels to preclude their rotation in directions opposite to the directions traveled when the lever acts thereon, and means for simultaneously moving all the dogs and said check pawls from engagement with the ratchet wheels when the lever is moved to one end of its path of travel.

4. In a mill of the character described, having a pair of parallel, longitudinally slidable racks, a block-carrying member pivotally secured to each of said racks, and pinions in mesh with each of said racks respectively, feed mechanism for alternately driving the pinions in the same direction to alternately advance the racks in the same direction, comprising ratchet wheels in connection with each pinion respectively, a lever oscillatable about the axis of said ratchet wheels, dogs carried by the lever in engagement with the ratchet wheels respectively to alternately rotate the ratchet wheels in opposite directions as the lever is oscillated, a pair of check pawls in engagement respectively with the ratchet wheels to preclude their rotation in directions opposite to the directions traveled when the lever acts thereon, and a throw-out cam engageable with the said dogs to simultaneously withdraw the same from engagement with the ratchet wheels when the lever is moved to one end of its path of travel.

5. In a mill of the character described, having a pair of parallel, longitudinally slidable racks, a block-carrying member pivotally secured to each of said racks, and pinions in mesh with each of said racks respectively, feed mechanism for alternately driving the pinions in the same direction to alternately advance the racks in the same direction, comprising ratchet wheels in connection with each pinion respectively, a lever oscillatable about the axis of said ratchet wheels, dogs carried by the lever in engagement with the ratchet wheels respectively to alternately rotate the ratchet wheels in opposite directions as the lever is oscillated, a pair of check pawls in engagement respectively with the ratchet wheels to preclude their rotation in directions opposite to the directions traveled when the lever acts thereon, and a throw-out cam engageable with the said dogs to simultaneously withdraw the same from engagement with the ratchet wheels when the lever is moved to one end of its path of travel, said throw-out cam having a tongue thereon for moving' the check pawls from engagement with the ratchet wheel as the dogs are so withdrawn.

6. In a mill of the character described, having a pair of parallel, longitudinally slidable racks, a block-carrying member pivotally secured to each of said racks, and pinions in mesh with each of said racks respectively, feed mechanism for alternately driving the pinions in the same direction to alternately advance the racks in the same direction, comprising ratchet wheels in connection with each pinion respectively, a lever oscillatable about the axis of said ratchet wheels, dogs carried by the lever in engagement with the ratchet wheels respectively to alternately rotate the ratchet wheels in opposite directions as the lever is oscillated, a pair of check pawls in engagement respectively with the ratchet wheels to preclude their rotation in directions opposite to the directions traveled when the lever acts thereon, and a throw-out cam engageable with the said dogs to simultaneously withdraw the same from engagement with the ratchet wheels when the lever is moved to one end of its path of travel, said throw-out cam having a tongue thereon for moving the check pawls from engagement with the ratchet wheel as the dogs are so withdrawn, there being a detent to hold the lever at said one end of its path of travel with the dogs and check pawls in the inoperative position whereby the ratchet wheels are free to move about their axes.

EDWARD S. FIELD.