US2642101A

US2642101A - Power buck saw

Info

Publication number: US2642101A
Application number: US177995A
Authority: US
Inventors: Ralph P Kipp
Original assignee: Individual
Current assignee: Individual
Priority date: 1950-08-07
Filing date: 1950-08-07
Publication date: 1953-06-16
Anticipated expiration: 1970-06-16

Description

June 16, 1953 p, K 2,642,101

POWER BUCK SAW Filed Aug. 7, 1950 2 Sheets-Sheet l INVENTOR I BY 1 ATTORNEYS:

June 16, 1953 Filed Aug. 7, 1950 R. P. KlPP 2,642,101 POWER fiUcK vsAw 2 Sheets-Sheet 2 ATTORNEYS o Patented June 16,1953

UNI-TED I STATES; "PATENT OFFICE I 7 I Q 2,642,101 I Y rowan BUCK SAW I Ralph P; Kipp, Ossining, N. Y. I Application August 7,1950, Serial No. 177,995

- 1 Claim. (-01. 143-63) more particularly, has reference to a power buck saw for wood sawing. I

By way of background, it may be noted that sawing machines of the general type or category into which the invention falls have heretofore had to be driven by a motor of several horse power, this being due toirreduceable friction. As a re sult, if'the sawing machine is to be driven electrically, an expensive power quired, and an ordinary house supply or lighting circuit has been found to be entirely inadequate.

An important obje'ctoi the present invention, accordingly, is to produce a sawing machine of the type stated which is designed in such a manher as to reduce friction to an absolute minimum, adapting the machine-for powering by an electric motor of no more than one quarter horse power operating on an ordinary lighting circuit.

Another important object is to provide a machine which will be capable of being powered as described above, and which will nevertheless cut wood whether it be wet or dry, crooked, hard, or soft, and which will additionally cut the wood to any desired length for useas firewood, posts, rails, etc.

Still another object is to provide a machine of the character described which will cut from logs, branches, cordwood. and the like, will be light, portable, compact, and semi-automatic in operation. I

' Still another object is to provide a sawing machine so designed as ture at low expense, with a minimum of parts simply arranged in a manner whereby they will not readily get out of order.

With the foregoing and other objects in view which will appear as the description'proceeds, the invention consists of certain novel details of construction and combinations of parts, hereinafter more fully described and pointed out in the claim, it being understood that changes may be made in the construction and arrangement of parts without departing from the spirit of the invention as claimed. I I

Referring to the; drawings Fig. 1 is a perspective view.

Fig. 2 is a side elevation. I I

Fig. 3 is an enlarged transversesection showing an automatic cut-01f for the motor.

Referring to the drawings in detail, the saw.- ingmachine includes a supporting frame including the lower end cross members I to which are rigidly connected the lower ends of upwardly line would be reto be. capable of manufac-- converging legs 2, there being a pair of legs 2 at each end of the frame.

Rigidly secured at opposite ends to the respec tive legs are the elongated, parallel, horizontally extending side rails'3 braced to the legs 2 by angular braces 4. Upper cross members 5 at opposite ends of the frame extend between the ends-of the side rails and rigidify the frame. A

plate 6 extends between the rails 3 and covers the medial portion of the frame.

Rigidly mounted on the plate 6 adjacent one end of the frame is-an electric motor I, preferably of no more than one quarter horse power,

the motor driving a small drive pulley 8 around.

which passes the belt 9 that also passes around the large diameter drive wheel ID, that is mounted I on a shaft I I journaled in the anti-friction bearing I2 elevated abovethe'frame by a pedestal).

An elongated'guide bar I4 extends longitudinally of the supporting frame and is elevated above the frame. At one end this guide bar is pivotally connectedto the bearing I2 for up and down swinging movement in a vertical plane. Intermediate the ends of the guide bar is an offset [5 offsetting the other or swinging end of the bar to one side of the frame. On said free or swinging end of the guide bar I4 is mounted for slidable reciprocation longitudinally of the guide bar, a slide I6 and rigidly secured at one end to the slide I6 is a bow frame l1.

' A'narrow, thin, saw blade I8 is connected to opposite ends of the bow frame by adjustable screws I8 capable of tensioning the saw blade as desired, the screwl8 at the outer end of the bow frame carrying changeable weights I9.

A pitman 20 is pivotally connected at 2| to the slide I6 and at 22 to the drive, wheel II). This is adapted to reciprocate the slide I6 for reciprocation of the saw blade I8 to sawthrough a piece of wood, notshown. As the blade feeds downwardly through the wood, the guide bar I4 on which the slide I6 reciprocates swings downward ly under the weight of the sawing mechanism.

I provide a bed for supporting a piece of wood to be sawed, and a clamp overlying said bed to hold the wood against movement during the sawing thereof. The bed includes a pair of horizontally extended angle irons 23 rigidly secured to the side rails 3 and'between these angle irons extends a cross bar 24' also rigidly secured to the angle irons. Upstanding postsv 25 extend vertically. and in parallelism witheach other, from the respective angle irons 23 and are rigidly secured to said angle irons.

Rigid with the posts 2 5 and with the angle irons 23 is a pair of parallel inclined supports 26; these are sharp edged and provide supports for a piece of wood deposited upon the bed and extending transversely of the frame. The sharp edged formation of the supports 26 causes the supports to bite into the piece of wood when the wood is pressed downwardly thereupon by a clamping screw to be described.

To support the wood at its other side I provide means including a transversely extended angle iron 27 supporting at an incline a plat 28 rigid with the upstanding angularly disposed parallel supports 29 cooperating with the supports 25 to provide a V-shaped bed for the wood, and also sufficiently thin or sharp edged to bite into said wood when the wood is pressed downwardly thereupon, regardless of the particular shape or thickness of the wood.

bearing l2, the switch 46 being in circuit with a receptacle 48 in which can be inserted a conventional electric plug 49 extending from an ordinary lighting circuit. The switch 45 is, of course, also in circuit with the motor I and controls the operation of said motor.

To limit the downward swinging of the arm 4| in an adjustable manner, I also provide the threaded adjusting screw 43 extending through said arm and adapted to engage the plate 8.

To prevent lateral sway or deviation of the guide bar l4 during its vertical swinging movement, a brace 50 can be secured to said guide bar and pivotally connected to the bearing I2.

I believe the use and advantages of the sawing machine willbe more or less apparent. A suitable piece of Wood is placed in the V-shaped bed and is clamped by the screw 33, the bow frame being Considering now the clamp construction, I provide the clamping bracket including the upwardly extended parallel members 3t rigidly secured at their lower ends to the cross bar 24, said members 38 being rigidly connected by cross braces 3| and being of longitudinally curved formation so as to overhang the V-shaped bed at their upper ends. Secured to the upper ends of the members 30 is a sleeve 32 internally threaded to receive the vertically disposed clamping screw 33 having at its upper end the turning handle 34. The clamping screw 33 when threaded downwardly engages a piece of wood disposed between the

supports

26 and 29 and securely holds the wood in place for sawing thereof.

' I provide upper and lower stops for the vertically swinging guide bar hi, and considering first the lower stop, this is designated at 35 and is rigidly secured to one of the angle irons 23 so as to project laterally from the supporting frame a short distance, thus to limit the path of downward swinging movement of the guide bar [4. The stop 35 does not engage the guidebar l4 until the saw blade 18 is disposed below the lowest part of the bed, thus to cause'the saw blade to efiectively cut any piece of Wood without the guide bar coming to rest until said wood has been cut fully through.

An upper rest is also provided for the. guide bar l4, to hold the bow frame and saw blade 18 in an up position during the removal of a sawed piece of wood and placementof another piece to be cut. This upper rest includes a sleeve 36 secured to the clamping bracket and extending transversely thereof, a detent 37 being slidable in said sleeve and being normally held in a retracted position, by the spring 38. The detent will, as will be understood, be provided with means for pressing the detentagainst the action of the spring 38 to a position in which it Will extend under the raised guide bar [4 thus to'support the guide bar in an upper position.

[Adjacent the other end of the guide bar there is secured thereto a depending sleeve 39 internally threaded to receive the threaded foot 40 extending downwardly from said sleeve as best seen in Fig. 3.

meanwhile positioned in its upper position of rest by engagement of the guide bar l4 over the retractable detent 31. When the machine is'ready for use, the arm 41 is manually swungupwardly,

with the saw blade l8 resting onthe piece of wood and the detent 31 retracted. The bow frame will now be driven, the slide I 5 being reciprocated longitudinally of the guide bar l4. As the blade cuts into the wood, the guide bar M, by weight of the bow frame and the changeable weights, will slowly swing downwardly in a vertical plane. Ultimately the wood will be out through and the foot 40 will then engage and swing downwardly the cut-off arm 4|, thus to cut off the power. The bow frame is now raised and another piece of wood inserted in the V bed and the operation This is part of an automatic cut-oil for the motor, the foot 40 being adapted to engage and force downwardly a transversely disposed arm 4 I, pivotally connected at one end to a bracket 42 mounted on the frame. within the sleeve so as to time the engagement of the foot and arm as desired by the user.

To the swinging end of the arm 4| is'pivotally connected an upwardly extended link 44 pivotally connected at its other end to a switch arm 45 extending from an electric switch 46 mounted upon a support 41 which can be rigidly secured to the The foot 40 is adjustable begun once more.

or importance is the fact that to reduce friction, the machine has a ball bearing crankshaft, and the pitman or, connecting rod is of elongated construction with an even and low angle attachment to the cross head. Additionally, the saw has a straight, long and low angle of sawing to avoid vibration.

I believe it will be apparent that any guards may be mounted upon the device as desired, and I have not shown any of said guards simply because they are well within the province of one skilled in the art and obviously need not be specially illustrated.

Additionally, I believe it should be noted that preferably the end of the clamp screw 33 would be cupped, and the saw holding bolts I8! are as shown equipped with lock nuts to permit the saw to be turned about its axis to straighten it as'necessary, to prevent it from running out.

What is claimed is:

In a power driven buck saw of the type havtical arcuate path about the horizontal axis, a

slide mounted on the guide bar for reciprocal movement therealong, a pitman connected to the drive wheel and to the slide for reciprocating said slide when the wheel is rotated, a saw blade carried by the slide-for reciprocal movement therewith, and an electrically powered drive motor mounted adjacent the drive wheel and having driving connection therewith, means for arresting the reciprocation of the saw blade when it attains a predetermined position below the horizontal axis, said means comprising an electrical make and break switch carried by the motor and in circuit therewith for establishing or interrupting the flow of electrical energy thereto, a lever mounted adjacent the motor for movement in a vertical arcuate path, a link carried by the lever and connected to the switch for throwing the switch and establishing the flow of electrical energy through the motor when the lever is raised, a screw adjustably carried by the guide bar and movable therewith in a path which intersects the path of movement of the lever for engaging the lever and depressing it to move the switch into a position to interrupt the flow of electrical energy to the motor, and a stop screw adjustably carried by the lever for movement therewith into engagement with the frame for relieving the switch from strain when the lever is depressed.

RALPH P. KIPP.

References Cited. in the file of this patent UNITED STATES PATENTS Number