US807897A - Lawn-mower. - Google Patents

Description

No. 807,897. PATENTED M019, 1905.

J. H. AUBLE.

LAWN MOWER.

APPLICATION FILED DEC 28. 1903.

2 SHEETS-SHEET 1.

5 M Q2 Ma 1'9 I a fag RE N N2 [V5 2 H3 2% R2 N0. 807,897. PATENTED DEC 19, 1905.

J. H. AUBLE.

. LAWN MOWER. APPLiOATION FILED nmze, 1903.

2 SHEETS-SHEET Z.

INVENTOI? wr -1% M453 ATTORNEY UNITED STATES PATENT OFFICE.

JAMES H. AUBLE, OF CINCINNATI, OHIO, ASSIG'NOR OF TWO-THIRDS TO JACOB H. BROMWELL, OF \VYOMING, OHIO, AND JAMES J. MCDONALD,

OF CINCINNATI, OHIO.

LAWN-MOWER.

Specification of Letters Patent.

Patented Dec. 19, 1905.

Application filed December 28, 1903- Serial No. 186,803.

To all wi l/072i, it ntay concern:

Be it known that I, J AMES H. AUBLn, a citizen of the United States, and a resident of the city of Cincinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Lawn-Mowers, of which the following is a specification.

The several features of my invention and the various advantages resulting from their use, conjointly or otherwise, will be apparent from the following description and claims.

In the accompanying drawings, making a part of this application, and in which similar letters of reference indicate corresponding parts, Figure 1 is a perspective view illustrating the greater part of a machine embodying my invention. In this view one of the driving-wheels is omitted. and the upper cover, which protects the knives and their connections, is absent. The brush is also absent. The handle is shown detached from the remainder of the machine. The upper part of the shank of the handle is broken off to economize space. Fig. 2 represents a vertical section of the machine, taken in a plane passing through the center of the driving-wheels and their axle, the cover of the cutting mechanism and the shanks of the knives being omitted. Fig. 3 represents a vertical transverse section of the machine, taken on line 3 3 of Fig. 1, the parts beyond the section being shown in elevation. The handle is not shown in this view. Fig. 4: is an elevation of that end of the machine which is on the right hand in Fig. 1. In this view the adjacent driving-wheel has been removed and the disk which fits the inside of said wheel is shown in elevation. Fig. 5 is an elevation of the under side of one of the upper knives and of the means for keeping the knife-blade against the adjacent lower blade. Fig. 6 is an edge elevation of the knifeshank of one of the upper knives and of the spring which contributes to keep the upper blade against the lower blade. Fig. 7 is an edge view of this spring. Fig. 8 is a front view of this spring. Fig. 9 is an elevation of the preferred form of screw for holding the blade of a given knife to the frame. Fig. 10 shows a transverse section of a knife-blade, showing the manner in which a blade is held to the frame and the screw that respectively holds the knife thereto. Fig. 11 shows in section the mode in which the upper and lower knife-blades lap each other. Fig. 12 shows in perspective parts of the reciprocating rods whereby the channel-bars which operate the knives are respectively reciprocated and a part of the guideway or bearing-box which cooperates to guide these reciprocating rods. Fig. 13 is a transverse vertical section of the parts shown in Fig. 12 and of the corresponding parts shown in Fig. 1, the section being taken in the plane of the dotted line 13 of Fig. 1 and the flanges of the bearing-box being shown in elevation. Fig. 14 shows in perspective parts of the reciprocating rods and of the channelbars which they respectively reciprocate. Fig. 15 shows an elevation of a part of either one of the driving-wheels, illustrating the gearing on the wheel for operating the pinion of the brush. Fig. 16 is a vertical central section of a portion of one of the disks and of the adjacent guideway for the rods which operate the knives. The purpose of the figure is to show the preferred mode of uniting the guideway to the disk. Fig. 17 illustrates in cross-section the reciprocating rods and their respective channel-bars and the relative heights of the channel-bars. Said section is taken in the plane of the dotted line 25 25 of Fig. 18. Fig. 18 is a view in perspective of the said chan-. nel-bars and of a portion of the said rods. Fig. 19 is a view in perspective of the bottom portions of the channel-bars and the rods and of the bottom of the adjacent portion of the guideway or bearing-box.

The figures are not all upon the same scale; but the scale of the figures is varied to the better fulfil the purposes of illustration.

In the description of the figures the groove is referred to as if the driving-wheel was lying on its side.

A indicates the frame that contributes to support the knives. The flanges A A of this frame are respectively connected to the disks B B. and thus support the frame A. This frame A carries a cross-bar A which supports the upper and lower tier of knife-blades. The frame at the front is supported by suit able rollers or wheels A pivoted at A to the frame. The frame A in front of each roller preferably carries a wedge-shaped guard A*, which latter operates to keep the grass, &c., away from the roller A behind it and prevents the latter from being clogged; but a special advantage is that this guard A* can be run a -1'g thecmss-barA by a pivot, preferably a screw The head of the screw prevents the blade L movement of the machine they readily wipe close to trees or fences and will bring the grass l in these'places into the path of the knives to 1 be cut. Thus little or no fringe of grass will be left at such places. At the rear there are two reciprocating rodsviz., rod M and rod N. Rod M carries a channel-bar M and the latter carries the lugs M Rod M would slip within the channel-bar M but a set-screw M is provided, whereby channel-bar M is compelled to move with rod M until this screw is intentionally loosened. The rear end of the shank of each of the upper knives K is located between two adjacent lugs M The blade K of each knife K is pivoted to K, whose shaskabove the screw-thread is the pivot-bearing. The head of the screw holds the blade down and prevents it from riding up and off the pivot. Thus when the rod M moves back and forth it will reciprocate the channel-bar M and will move the rear ends of the knives K back and forth, and thus cause the knives to oscillate on their respec-' tive pivots K". Thus the blades K of these knives will oscillate edgewise.

Rod N carries a channel-bar N and the latter has the lugs N Rod N is prevented from slipping within channel-bar N by means of a set-screw N Thus the rod N and the channel-bar l 2 may be made to reciprocate as one.

The rear end of each of the shanks of the lower row of knives L is located between two adjacent lugs N The blade L of each knife L is pivoted to the cross-bar A by a pivot, preferably such as a screw K, whose shank above the screw-thread is the pivot-bearing.

from coming off the pivot. The shanks of screws K when used with blades K are longer than when used with blades L Thus when the channel-bar N and the rod N are reciprocated the rear ends of the knives L will be moved likewise, and the knives L will be caused to oscillate on their pivots K*. Thereby the blades L of the knives L will oscillate edgewise.

My preferred mode of locating the upper knives relatively to the lower ones is as shown i and consists in locating them not one directly over the other in pairs, substantially as in a pair of shears, but somewhat apart, so that when the machine is at mid-stroke the points of the upper blades shall be at a distance from the points of thelower blades. The rear swell of each knife-blade at all times laps and engages the rear swell of the blades of the adjacent knives, substantially as shown in Fig. 1. Such a construction assists in preventing the blades from becoming rusted after being taken out of the wet grass, because in the themselves, and there is but little surface of these knives that does at any time'remain together to hold moisture and result in rust. In connection with the remarks relative to the location and operation of the knives see especially Figs. 1, 3, and 11.

In order to cause the blades K of the upper knives to press continually against the blades L of the lower knives and to make a proper shearing cut, I provide a spring for accomplishing this object. A suitable spring P is shown in Figs. 5 to 7, inclusive. This spring P rests on the channelbar M and tends to elevate the rear end of a knife K, so far as permitted to do so, for the pivot K holds the knife there and operates as the fulcrum, of which the knife-blade and its handle (or shank) are the lever. Thus each upper knife-blade is kept close to the lower blades opposite to itthat is, kept against such part of these lower blades as can come into contact with it. There is preferably one spring for each upper knife K.

To conveniently enable the upper knives to work in a desired plane above the plane in which the lower knives operate, the channelbar M is elevated relatively to the channelbar l The construction ofthe knife is also a feature of my invention. This feature consists in making the knife of sheet metal and of a form substantially as follows: A sheet-metal blank cut to the desired form is struck up and bent into the shape shown in the drawings. (See more particularly Figs. 5, 6, l0, and 11.) In this construction the handle is made more or less tubular by having its side edges bent at right angles to the rest of the shank and then bent inward, substantially as shown, and the blade is bent into a concave form, the edges of the concave being the cutting edges K K of the blade. Such a knife is more readily kept sharp than is a solid one. As the cutting edges wear, they obviously remain sharp. Thus much of that extraneous sharpening, which consists in removing the knives from the machine and sharpening them and replacing them, is obviated. There is no central portion between the cutting edges K K to hump up and remain elevated while the edges wear away and which elevated portion when present, as is usually the case, must be reduced to enable the cutting edges to work effectively. It is to be understood that the upper and lower knives are preferably made alike. The hollow shank or handle K of the knife affords a convenient chamber or space wherein the base P of the spring P can be located and fixed. The slot K of the shank allows the spring to come through from its base and properly project substantially as shown. These knives K and L are about onehalf as heavy as the solid ones. The power required to move them back and forth is much less than to reciprocate solid ones. Thus in a half-days work with a mower there is a great economy of power.

In order to utilize the entire width of the machine, there should be knives in front of the driving-wheels. To this end upper and lower knives, as shown, are there located. The shanks of these knives are necessarily short and it would not be very practicable to respectively connect them to the reciprocating sleeves aforementioned; but these knives should be operated and should operate in unison with the other knives. I provide two bars A and A The lower bar A is connected to each of the knives of the lower tier bya pivot PA and each of the knives of the upper tier is connected to the upper bar A by a pivot PA WVhen the knives of the upper tier, that are connected to the channel-bar M reciprocate, these knives move the bar A and the latter moves the end upper knives connected thereto. IV hen the knives of the lower tier, which connect with the channel-bar N, reciprocate, these knives move the bar A and the latter moves the end lower knives connected to this bar.

The upper end knives are each provided with a spring P, located between the pivot PA and the'pivot K". The free end of this spring lies on the bar A The function of this spring with each end knife is the same as with the upper knives first described.

The end knives are preferably made of sheet metal on the plan of the other knives.

It is to be understood that a shield WV extends from the rear portion of the machine and over the knife-shanks and over the blades as far as to a line just in front of the pivots K". This shield is pivoted at the rear of the machine at V. Thus it can at any time be raised and thrown back as far as the axle will permit and access be had to the knives and the mechanism for reciprocating them. The knife mechanism below is also protected by an under shield 1V The latter shield is preferably formed in one with the main parts A &c., of the frame, the whole being stamped out of a sheet of metal.

I provide a long roller X, located near the front of the machine. This roller is to run on the ground and is to support the front of the machine, the end rollers A A being preferably only used when a rut or a narrow elevation is present Where such roller is. This long roller X is held by pivots, one at each end, and each pivot is preferably connected with an adjacent rod X which latter extends backward and pivots in the frame at X To accommodate this roller and keep the knives down close to the ground, I form an arch or concave in the shield WV into which the upper part of the roller X fits. Thus the cutting mechanism can be low and the shield W will not come into contact with the roller X. The rods X may bear directly against the bottom of the shield substantially as shown, and thus the front portion of the machine is supported; but I prefer to have each rod X rest against a set-screw X, screwed into the frame. I can thereby adjust the rod,

and consequently the roller X, nearer to or farther from the frame A, and hence I am able to set the cutting-knives nearer to or farther from the ground. I -am thus enabled to regulate the height of the cut on the grass, &c.

The construction of the preferred means for operating these knives is as follows: I provide guideways Gr, one at each wheel, and I connect the same to the adjacent disk B in a suitable manner. Various Ways of securing the guideways Gmay be employed. Thus in Figs. 1 and f I have shown the guideways Gr provided with flanges G and these flanges of a given guideway are shown bolted to the adjacent disk; but a preferred mode of uniting these flanges to the disk is illustrated in Fig. 16 and is as follows: I provide an opening B in the lower part of each disk B. I pass the flanges Gr of the guideway G before bending through said opening and then bend said flanges at right angles, so that they will lie against the inner side of the disk B. I then bolt the flanges to the disk, as in the former construction. there moves a carriage Q, provided at each side with a wheel Q pivoted to the carriage. At the bottom of this carriage is a stud Q, extending down through a slot G of the guideway Gr and provided with a roller or wheel Qfl whose plane of revolution is at right angles to the plane of revolution of the driving-wheels. To one of the carriages Q under one driving-Wheel the end portion of the rod M is connected, and to the other carriage Q under the other driving-Wheel the adjacent end portion of the rod N is connected. Thus when one carriage is moved by the adjacent driving-wheel the rod M is reciprocated, and when the other carriage is moved by its driving-wheel the rod N is reciprocated. The carriage Q is constructed to have a guide space Qf and in this the end part of the other knife-moving rod M or N, as the case may be, slides alongside of its companion rod. This construction is fully illustrated in Figs. 12 and 13. Thus each carriage serves also as a guideway, and the two rods M and N, with their respective channel-bars M and N carrying their respective sets of knives, move back and forth by each other at all times near each other and in parallel lines. The means for operating these rods through the intermediate agency of the roller or stud Q," are as follows: Each driving-wheel contains a zigmg or spiral guideway R, each having a side R and an opposite side R The roller Q, of one carriage is in one of these guideways, and the roller Q" of the other carriage is in the other of these guideways. As the driving- Wheels revolve the rollers Q,* are caused to reciprocate and move their respective carriages Q, Which latter in turn move their respective rods and oscillate the knives thereof. Thus the upper knives operate with the lower In each of these guideways Gr knives to make a shearing out after the manner of a pair of scissor-blades; but with this additional difference that the blades aredoubleedged and ,cut at one side and then at the other in connection with the blades of the adjacent knives.

T is a brush for sweeping the grass from the machine. One end of this brush may be held in any suitable manner by one of the disks Bas, for instance, by being placed in a hole 13*. The other end of the brush enters the sleeve T in the other disk B and has a gear T connected therewith, which is adapted to engage with gear T", fixed to the drivingwheel E. Thus the wheel E will drive the brush T; but as this forms no part of my invention it will not be further described.

hen the mowing-machine is to be run from one place to another and no cutting is to be done, it is desirable that the knives do not move and it is desirable that the knives be elevated out of the way.

The knives are readily put out of action by unscrewing the set-screws M and N. This disengages the channel-bars M and N from their respective rods M and N. These rods will continue to reciprocate as the drivingwheels revolve; but the channel-bars and the knives they carry will not reciprocate.

The preferred construction of-the handle and the mode of connecting it to the remainder of the machine and of using it is as follows: Each arm Chas two portions C C preferably made in one. Each arm near or at the junction of these portions C C is provided with a studIY. Each of the portions C at its free end is provided with ahole C The axle D passes through the holes G C of the arms. When the machine is in position to cut the grass, the studs C" are respectively in the adjacent holes B I/Vhen it is desired to elevate the knives, the studs C are withdrawn from holes B and inserted into their respective holes B B Instead of the holes B and B other suitable detents may be employed in connection with studs.C* or equivalent detents on the handle.

It will be understood that the wheels E rotate with the axle, while the disks B are adapted to rotate around the aXle; but in the cutting position of the machine these. disks are stationary.

My improvements are applicable not only to mowing-machines, but also to weed-cutters, to harvesting-machines, and to the like, and I claim the application of the same broadly wherever applicable.

\Vherever in the specification and the claims the term mowing-machine or the like is used, I desire it to be understood as covering machines and devices for any and all of the 1. In a mowingmachine, a knife and its shank made of sheet metal, the knife and the shank being concave at their mid-portion, and the edges of the shank being further bent down and then inward toward each other, substantially as and for the purposes specified.

2. In a mowing-machine, a knife and its shank made of sheet metal, the knife being concave at its mid-portion, and the shank being at the edges bent over and around, forming a slotted tube, substantially as and for the purposes specified.

3. In a mowing-machine, a knife and its shank made of sheet metal, the metal at the shank bent around to form a tubular structure, having a slot left therein at the back, in combination with a spring, having an enlarged base located within the shank, and an elastic free portion, whose shank passes through said slot, substantially as and for the purposes specified.

4. In a mowing-machine, a frame,.upper and lower tiers of knives, pivots K pivoting the knives to the frame, a channel-bar M having lugs M a channel-bar N having lugs N the channel-bar M being higher than channelbar N the shanks of the upper tier of knives located on channel-bar I 2 between the lugs M and the shanks of the lower tier of knives located on the channel-bar N between the lugs N and means for elastically keeping the upper knives in contact with the lower ones,

substantially as and for the purposes specified.

5. In a mowing-machine, a frame, upper and lower tiers of knives, pivots K pivoting the knives to the frame, a channel-bar M having lugs M a channel-bar N having lugs N the channel-bar M being higher than channelbar N the shanks of the upper tier of knives located on the. channel-bar M between the lugs M and the shanks of the lower tier of knives located on the channel-bar N between the lugs N and springs respectively fastened to the upper tier of knives, and pressing on the channel-bar M and pushing the shanks upward, and the knives downward against the lower knives, substantially as and for the purposes specified.

6. In a mowing-machine, bar A bar A the upper and lower tiers of knives provided with shanks, the knives themselves pivoted to the frame, the outlying or end knives having short shanks, all of the shanks being pivoted, the upper tier to the bar A and the lower tier to the bar A and mechanism for imparting to the long shanks a vibratory movement, for operating all the knives, substantially as'and for the purposes specified.

7. In a mowing-machine, a cross-bar A the upper and lower tiers of knives, having shanks, each knife being pivoted to the crossbar A, and the channel-bars M and N each respectively oscillating the shanks of the knives of its respective tier, and the rods M and N, and means for respectively reciprocating the rods M and N, and means for securing, at will, the rod H to the channel-bar M and the rod N to the channel-bar N substantially as and for the purposes specified.

8. In a mowing-machine, a cross-bar A the upper and lower tiers of knives, having shanks, each knife being pivoted to the crossbar A and the channel-bars M and N each respectively oscillating the shanks of the knives of its respective tier, and the rods M 10 and N, and the set-screws 1W and N", respectively securing the rods M and N to their respective channel-bars M and N substantially as and for the purposes specified.

JAMES H. AUBLE.

Attest:

SAMUEL A. WEsT, K. SMITH.

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