US626531A

US626531A - Hacksaw

Info

Publication number: US626531A
Authority: US
Publication date: 1899-06-06
Anticipated expiration: 1916-06-06

Description

No. 626,53I. Patented lune 6, |899. E. E. EUCHENHOFER.

HACKSAW.

(Application led Apr. 3, 1899.)

2 Sheets-Sheet l.

(No Model.)

TN: Nonms Parzns ook, moraumc.. NAsnmsmu, u. c4

Patented lune 6, |899.

No. 626,53l.

E. E. EUCHENHUFER.

HACKSAW.

(Application led Apr. 3, 1899.)

2 Sheets-Sheet 2.

(No Model.)

h llllh lll mcg-wm m: Nowms Evans co. pHoro-mma, wwnm'o llNrrnn STATES PATENT OFFICE.

ED\VARD E. EUOHENHOFER, OF DAYTON, OIIIO.

HAC KSAW.

SPECIFICATION forming part of Letters Patent No. 626,531, dated J' une 6, 1899.

Application filed April 3,1899. SerialNo. 711,470. (No model.)

To @ZZ whom 'it may concern:

Be it known that I, EDWARD E'. BUCHEN- HOFER, a citizen of the United States, residing at Dayton, in the county of Montgomery and State of Ohio, have invented certain new and useful Improvements in Hacksaws, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to certain new and useful improvements in hacksaws for sawing metal, tc.

The object of this invention is to provide means for forcing the hacksaw into the metal when the saw is making its cutting stroke and to raise such saw from engagement with the metal on its return stroke..

My invention also relates to improved means for automatically stopping the movement of the saw when the metal being operated upon has been sawed in two.

My invention further relates to a reci proeating saw-carriage and a combined pivoted saw-frame.

My invention also relates to details of construction hereinafter appearing, and particularly pointed out in t-he claims.

In the accompanying drawings, on which like reference letters and numerals indicate corresponding parts, Figure l is a side elevation of my improved hacksaw complete; Fig. 2, a plan View of the same; Fig. 3, a detail partial sectional view showing the manner in which the saw-frame is connected with the sawcarriage, together with the frictional clutch for operating the saw-carriage; Fig. 4, a partial detail sectional view on the line no or of Fig. 3, looking in the direction of the arrows 5 Fig. 5, a partial detail perspective View of the operating-lever for throwing the machine into and out of gear; Fig. 6, a partial perspective view of the bearing-brackets and bearing for the main driving-shaft, and Fig. 7 a detail view of the guide and guide-bolt to prevent the saw-frame from having side movement.

I-Ieretofore in machines of this class it has been very difcult to obtain a perfectly smooth cut in the iron and also to prevent the saw from dragging as it made its return stroke. IVith my invention Ihave provided means for causing the saw-teeth to be forced into engagement with the iron being operated upon, and at the same time the same means will cause the saw to be disengaged from such iron on the back or non-cutting stroke.

The letter A represents a suitable base mounted upon legs B. This base carries a driving-wheel C, mounted in suitable bearings D upon a shaft E. It will be seen that the hub G has a lug or extension II from its outer face, which at certain times is adapted to engage with a lug I, extending from acollar J, fixed upon the shaft E. In order to cause the lugs I and .I to engage with each other, I provide a lever K, which is mounted upon the shaft E and has projecting from its inner side lugs or projections L, which force the driving-wheel outwardly on its shaft for such purpose. This will cause the driving-shaft to rotate. In order to again release the driving-wheel from the shaft, it will be observed from Fig. 2 that I have provided a spring P, which is interposed between the collar J and the hub of the driving-wheel, so that it will normally tend to press the driving-wheel inward; but this can only be done when the driving-wheelisin its rear or dotted position, so that the lugs L may enga-ge with the notches M in the outer face of the bearing N, formed on the lowerend of the bracket O, for the drivin g-shaft E. Upon the inner end of this shaft is mounted a disk L', Which carries a crank-pin R, havin g pivoted thereon one end of a pitman S. The other end of said pit-man is pivoted upon a stud or pin U,

carried by the saw-carriage NV, mounted upon the guide-rods X, one of which stands vertically above the other. In order to take up the wear in the pitman-bearings, I provide bolts T and V, which bind the respective slotted ends of said pitman as snugly as desired upon the crank-pin and carriage-stud.

In order to slidably mount the saw-carriage upon the guide-rods, I employ adjustable caps Y, which are adapted to be connected with said carriage by means of screws Z in such a manner that they, together with the carriage,

form bearings which freely slide upon said guide-rods. The rods X are screwed to brackets 2, projecting upward from the base A, by means of screws 3.

Near the rear end the saw-carriage is provided with a boss or extension 4 in the nature of a hub. Through this boss or extension passes a bolt 5, upon which, adjacent to the saw-carriage, is pivotally mounted a sawframe 6 and a friction toothed segment 7 while between the saw-frame and toothed segment is mounted a packing 8, composed of leather or other suitable material. In order to bind the friction-segment against the sawframe, I provide a chased hand-nut 9, which screws uponthe outer end of the bolt 5 and has mounted between it andthe segmentclutch Z a spring and washer ll, the latter having an angular opening adapted to t upon the angular-shaped portion 12 of the bolt 5. This spring is for the purpose of permitting more or less yielding contact between the clutch or toothed segment` and the boss on said saw-frame, while the washer prevents the unscrewing action on the hand-nut by reason of the relative movement between the saw-frame and clutch or toothed segment, as will hereinafter appear. It will be seen that the outer end of said bolt is also slotted, as shown at 5. This is for the purpose of giving a spring-like effect on the hand-nut J at all times, so that it will assist in preventing the hand-nut from unscrewing. The outer end of the saw-frame supports a saw 13, mounted in the ordinary or any suitable manner. It will be observed that the saw-teeth all slant in one direction, which is for the purpose of permitting them to saw when the frame is moved in the direction of their slant only. In sawing metal some is much softer than others, and the harder the metal the morepressure is required, so that the teeth will cut faster. Heretofore this has been accomplished by employing a heavy weight; but where such weights were used they operated toV hold the saw in engagement with the metal when the saw-frame was making its return stroke, which acts to dull the saw very quickly, as the points were being constantly ground off on such return stroke. It has been my aim to overcome this difficulty and to do away with excessively heavy weights and at the same time to provide proper mechanism for causing the saw .to be forced into engagement on the outstroke and raised from engagement on the instroke. This Ihave accomplished by means of my friction-clutch. By means of the hand-nut 9 the toothed segment 7 may be screwed up against the packing 8 and the saw-frame 6 as lightly or as snugly as desired. As the toothed segment travels forward in engagement with the rack 14 in a manner presently to appear, there will be relative movement, of course, between the saw-frame and the toothed segment; but since the toothed segment Ais frictionally clutched thereto it will cause the saw-frame to pivot about its pivotal connection with the sawcarriage, thereby descending at its outer end. This will of course cause the sawto be forced into engagement with the metal, and the tighter the friction between the toothed segment and the saw-frame the harder such engagement with the metal. As the carriage makes its return stroke the toothed segment 7 will raise the end of the saw-frame from cutting or rubbing contact with the metal being operated upon, such metal being held by a vise 15, which is made adjustable by means of the screw 16, so that it will accommodate various sizes of metal as desired.

I have referred to the saw-carriage, together with the saw-frame, as traveling back and forth. This is accomplished by means of the pitman being connected with the carriage W and to the crank-pin R, so that as the crankdisk L is rotated the saw-carriage will be moved backward and forward in its ways or guides X.

In order to assist the saw-frame in holding the saw into cutting contact with the metal, I provide a sliding weight 17, which is mounted on a track 1S, extending the full length of the saw-frame. This weight may be moved in or out on its track, according to the degree of pressure desired, and is held in such position by a set-screw 10, adapted to screw down upon the track. The hand-nut 9 may also be manipulated to cause a tighter gripping of the clutc/h members, which will cause the saw ,to be forced into the metal much harder than where the hand-nut is operated to bind the clutch members together but slightly. Howi ever, it will be understood that the weight and the friction-clutch are operated in conjunction with each other-that is, when the weight is slid outward more pressure or ten stroke, while when the weight is thrownbackl ward on the sawframe the tension of the clutch members may be lessened accordingly.

In order to hold the saw-frame thrown back to more readily permit of placing the metal to be operated upon within the vise, I provide a slotted lever 18, which has a notch 19 at its upper end, into which extends a screw 20. This screw is adaptedl to be carried by the saw-frame, while the lever itself is supported upon a projection 21, extending from the sawcarriage. As the saw-frame is raised to the position indicated in dotted lines in Fig. 1 the stud-screw 20 engages with the notch 19', and thereby holds the saw-frame inV its elevated position. Vhen itis desired to operate the machine, the slotted lever 1S' is thrown to the position indicated in full lines in Fig. 1, in which position the saw-frame is permitted to drop into contact with the metal to be operated upon.

I will now refer to the means for automatically stopping the operation of the machine when it has entirely severed the metal it is operating upon.

IOO

IIO

ISO

It will be seen that from the side of the sawcarriage extends a bracket 2l'. In the upper end of the bracket is carried a set-screw 2:2. Upon the top of the set-screw rests the sawframe when in its lower position. In this position the hook 23 will engage with the lug 2t', projecting from the lever K. Thus as the saw-carriage is again moved to its rearm ost position the lever K is partially rotated, which will cause the teeth L to match with the notches M on the bearing N, so that the spring may force the driving-wheel along on the shaft E until the tooth or projection II disengages with the tooth or projection I on the collar J, whereby the driving-pulley is disconnected from the main driving-shaft, thus stopping the operationof the machine. It will be understood, of course, that until the saw-frame comes in contact with the set-screw 22 the hook 23 will not be sufficiently close to the lug 24' to engage therewith. Consequently the machine will continue to operate as long as there is any metal to be sawed, as the sawframe will not rest upon the set-screw until after the metal is severed.

Referring now to the means for holding the saw-frame from undue vibrations at its outer end, it will be seen that the bracket 25, forming a portion of the saw-frame, carries a slotted bolt 2G, which is mounted in a slightlyelongated hole 27 in said bracket. This slotted bolt engages with one edge of the bracket 2l' and the elongated hole 27 permits of slightly adjusting the bolt so that there will be no binding between it and the bracket. In this manner the sawframe is prevented from laterally vibrating because of its connection with the bracket 2l so far in advance of its pivotal connection with the saw carriage. Thus the saw will run perfectly true through the metal and will make a smooth and even cut.

Referring to Fig. 3, it will be seen that the bolt 5 is held from turning in the saw'carriage by reason of a set-screw 2', which is screwed into the hub 4 and against the bolt.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, ism

l. In a hacksaw, the combination with a base, of a reciprocating saw-carriage mounted thereon, a saw-frame pivotally connected with said saw-carriage, means for throwing said saw-frame downward at its forward end when traveling in one direction and upward when traveling in the opposite direction.

2. In a hacksaw, the combination with a base, of a reciprocating carriage mounted thereon, a saw-frame carrying a saw pivotally connected with said carriage, a friction-clutch adapted to engage with said carriage and with said sawframe, and means for reciprocating said carriage and operating said clutch members relatively to each other.

3. In a hacksaw, the combination with a base, of a sawcarriage slidingly mounted thereon, a saw-frame pivotally connected at one end with said carriage and carrying at its other end a saw, a toothed segment also mounted on said pivot and adapted to frictionally contact with said saw-frame, a rack carried by said base and adapted to be engaged by said toothed segment, means for rolling said toothed segment backward and forward on said rack and also for reciprocating said carriage, whereby the saw is forced into cutting engagement as the toothed segment rolls in one direction, and out of such cutting engagement when-such segment rolls in the opposite direction, substantially as shown and described.

4. In a hacksaw, the combination with a base, of a main driving-shaft carried by said base, a driving-wheel loosely mounted upon said shaft and a crank-disk ixedly mounted thereon,a slidable saw-carriage mounted upon said base, a pitman pivoted at one end to said saw-carriage and at its other end to said crank-disk, a saw-frame also pivoted to said carriage and carrying at its outer end asaw, a rack mounted on said base, a toothed segment engaging with said rack, and adjustable friction contact between said toothed segment and said saw-frame whereby when the toothed segment is rolled forward on said rack the segment will act to throw the for-V ward end of said frame downwal'd so that said saw will more readily engage with the metalto be operated upon, and on its return stroke will throw said saw out of engagement with the metal operated upon, substantially as shown and described.

5. In a hacksaw, the combination with a base, supporting a main driving-shaf t, a driving-pulley loosely mounted thereon, and carrying a tooth or projection extendingfrom its hub, a cap also having a matching tooth or projection xedly mounted on said shaft, said lugs adapted to engage with each other, whereby said shaft is rotated, a crank-disk carrying a crank-pin lixedly mounted on the inner end of said shaft, a sliding saw-carriage mounted in ways or guides carried by said bed, a saw-frame pivotally connected, at one end, with said carriage, and carrying a saw at its other end, a toothed segment rotatably mounted, a rack secured to said base with which the segment engages, means for frictionally connecting said segment with said saw-frame, and a pitman for connecting said saw carriage and said disk crank-pin` together, whereby when the main driving-shaft IOO IIO

of-said friction-clutch whereby there will be relative movement between said member of the clutch and said saw-frame, substantially as shown and described.

7. In a hacksaw, the combination with a base, having a saw-carriage reciprocatingly mounted thereon, of a saw=frame pivotally connected with said carriage, a toothed segment rotatably mounted upon said pivot and adapted to engage with the base of said machine, a frictional surface between said saw'- frame and said toothed segment, a hand-nut adapted to press said toothed segment, frictional surface and saw-frame into close contact with each other; and awasher and spring interposed between said toothed segmentand said hand-nut, and means to prevent said washer from rotating, and other means for reciprocating said carriage, substantially as shown? and described.l

8. In ahacksaw, the combination with a base havin ga reciprocating carriage mounted thereon, of a saw-frame pivoted to said carriage, a slotted lever also pivoted to said carriage and having a notch in said slot, a stud or pin projecting from saidsaW-frame and adapted to extend within the slot in said lcver and to engage said notch when the saw; frame is in its-raised position.

9. In a hacks'aw, the combination with a base having a reciprocating carriage mounted thereon, of a saw-frame pivotally connected tosaidV carriage, a hook carried by said sawframe, means for throwing said lmachine out of operation, such means adapted to be engaged by said hook and to automatically stop thefmachine when said saw-carriage is in the proper position to permit of such engagement, substantially as shown and described.

10. In a hacksaw, the combination with a base carrying a main driving-shaft and having mounted thereon a reciprocating carriage, a pulley outwardly shiftable on said shaft, means for engaging said driving-pulley when in its outer limit to drive said shaft, a lever adapted to be operated in one direction to throw said pulley to its outer position, and a spring adapted to shift said pulley out of driving contact with said shaft, a sawframe pivotally connected with said carriage and carrying a hook adapted to engage with said lever to throw it in the opposite direction when the saw-frame is in its lowermost position, whereby the spring will shift the driving-pulley out of driving contact with said shaft.

l1. In a hacksaw, the combination With'a base, of a reciprocating saw-carriage mounted thereon, a bracket extending from said earriage and carrying a set-screw, a saw-frame pivoted to said carriage and adapted to be limited in its downward movement by said set-screw, substantially as shown and described.

12. In a hacksaw, the combination with a base carrying a reciprocating and pivotallymounted saw-fram e, of a track or slide formed uponthe upper edge of said frame, a weight adapted to slide on said track and aset-screw for securing said weight in any desired p0- sition upon said track, substantially as shown and described.

In testimony whereof I aiiix my signature in presence ot' two witnesses.

EDWARD E. EUCHENHOFER.

W'itnesses:

PAUL J. VORTMAN, E. J. FINKE.