Adapter frame for roto-tillers

A log splitter attachment for use with a garden tiller. The log splitter attachment is comprised of a frame portion which is releaseably attached to the roto-tiller drive shaft, a log splitting screw which is releaseably attached to the tiller drive shaft to allow for rotatable movement of said splitting screw in unison with the garden tiller drive shaft, and a log support bar attached to the frame portion and extending outwardly for ground engaging support to provide a log rest support during use, and to stabilize the frame portion and the tiller during use.

BACKGROUND OF THE INVENTION 
Mobile garden tillers, often referred to as "roto-tillers" are well known 
and have in the past few years come into general widespread use. Such 
roto-tillers are quite expensive and during the off season for gardening 
have little or no use for their owner. No doubt the seasonal usage of such 
tillers has prevented some prospective buyers from purchasing such units. 
Applicants have discovered a useful frame attaching means for a roto-tiller 
which allows that tiller to be used year around. The primary purpose for 
applicant's roto-tiller attachment frame is to allow log splitting; 
however, as explained in the detailed description of the invention, the 
frame attachment of this invention also is versatile in that it has many 
other uses. 
Accordingly, one object of this invention is to provide an adapter frame 
for roto tillers, to make said tillers useful on a year around basis. 
Another object of this invention is to provide a roto-tiller adapter frame 
which allows said roto-tiller to be conveniently and quickly used for log 
splitting of firewood. 
Yet another object of this invention is to provide an inexpensive, quick 
and easy frame attachment for a roto-tiller which allows log splitting and 
which at the same time stabilizes said roto-tiller during use. 
An even further object of this invention is to provide an inexpensive 
roto-tiller frame attachment which is safe, efficient, comprised of a 
minimum of parts, and which when used in conjunction with a roto-tiller, 
is wholly portable along with said roto-tiller. 
Yet another object of this invention is to provide a frame attachment 
which, with minor adaptations, can not only be used for log splitting, but 
also may be used for a two wheel transport dolly, a portable table, a 
power take-off drive attachment, and a snow plow, as well as a variety of 
other uses which will become apparent from the detailed description, 
including a transport device for split logs.

SUMMARY OF THE INVENTION 
The invention relates to a log splitter attachment for use with a garden 
tiller. The basic attaching frame has means for mounting the frame to a 
garden tiller, and means for attaching a log splitting screw to the drive 
shaft of a roto tiller to allow rotatable movement of the log splitting 
screw in unison with the tiller drive shaft. The frame also has as an 
essential element a log support bar upon which logs for splitting may be 
rested. In addition, the log support bar functions to stabilize the unit 
to prevent overturning caused by torque during the log splitting 
operation. 
DETAILED DESCRIPTION OF THE INVENTION 
Looking first at FIG. 1, a conventional roto-tiller 10 is comprised of a 
tiller frame 12, a roto-tiller power means 14, and a conventional 
transmission and power linkage depicted schematically at 16 and a 
rotatably driven roto-tiller drive shaft 18. Since the precise 
construction and manner of operation of a roto-tiller are well known, 
further details with respect to the roto-tiller per se, for sake of 
conciseness, will not be provided herein. 
The basic frame for the log splitter is comprised of a pair of spaced apart 
parallel side members 20 and 22 joined together at one end by front frame 
member 24 which may be conveniently welded to the ends of side frame 
members 20 and 22. The rear end of frame members 20 and 22 is left open so 
that a roto-tiller 10 may be moved into the frame. Thus, the basic 
framework formed by side frame members 20 and 22, and front frame member 
24 is U-shaped. 
At the open end of the U-shaped frame portion, each of sides 20 and 22 have 
a pair of spaced apart apertures 26, 28 and 30 and 32, respectively. 
Angular metal straps 34 and 36 may be attached via conventional bolts or 
the like to frame members 20 and 22, respectively. At the end opposite 
their attachment to frames 20 and 22, straps 34 and 36 carry transport 
wheels 38 and 40 attached by conventional means. As can be seen, straps 34 
and 36 have at their midway portion, a generally upwardly inclined bend in 
order to allow the bottom surface of wheels 38 and 40 to rest on the same 
surface as the bottom of side frame members 20 and 22. As will be 
explained hereinafter, when the frame's forward portion is picked up for 
transport, wheels 38 and 40 will then rest on the ground for rolling 
movement as best depicted in FIG. 3. 
Approximately midway between the forward end of side frame members 20 and 
22, and the rearward end thereof is a cross bar 42 which joins side 
members 20, 22 at their midway section. As can be seen, crossbar 42 is 
joined at each end to a mounting plate 44 (only one is shown in the 
drawing). Mounting plate 44 has a plurality of bores 46 which may be 
aligned with bores 48 in side frame members 20 and 22 to allow for lateral 
adjustment of cross-bar 42 to provide different spacing, as needed for 
differing roto-tiller units. Of course, mounting plate 46 is attached via 
bores 46 to side frame members 20 and 22 by conventional bolt means placed 
between bores 46 in mating alignment with bores 48. 
A pair of upwardly extending mounting tubes 50 and 52 are welded to the 
cross-bar 42 as depicted. Each of tubes 50 and 52 have pin receiving holes 
54 and 56, respectively. 
A pair of bushing holders 58 is comprised of a downwardly extending tube 
portion 60 with a bushing holder collar 62 welded across the top thereof. 
Tube portion 60 is of a proper diameter to telescopically fit within 
mounting tubes 50 and 52. The height of bushing holder collar 62 with 
respect to side frame members 20 and 22 may be adjusted by mating 
alignment of one of the plurality of openings 64 in tube portion 60 with 
pin holes 54 and 56 of mounting tubes 50 and 52 and insertion of a pin 
therethrough. It is to be understood that while only one bushing holder 58 
is specifically shown in the drawing, an identical unit is also employed 
to matingly fit within the other tube holder 50. 
A pair of drive shaft connecting bushings of identical construction 
(therefore only one is shown) 66 are inserted through bushing holder 
collars 62 and pinned to roto-tiller drive shaft 18 via pin aperture 68 
which is matingly aligned with pin aperture 70 of roto-tiller drive shaft 
18 with pin 72 inserted therethrough. It can therefore be seen that 
connector bushing 66 is free to rotate within bushing holder collar 62 in 
unison with drive shaft 18. 
At its end opposite the connection with roto-tiller drive shaft 18, bushing 
66 has a second connecting pin aperture 74. 
The log splitting screw is comprised of a conical splitting screw 76, which 
has attached at its base by conventional means a screw shaft 78. At the 
end of screw shaft 78 opposite conical screw 76, is screw shaft insert 
collar 80 which is welded thereto. Collar 80 has pin aperture 82 which is 
pinned to connector bushing 66 after insertion of bushing 66 into shaft 
insert collar 80 via mating alignment of pin hole 74 and 82 and insertion 
of pin 84. 
It can therefore be seen as drive shaft 18 of roto-tiller 10 is rotated, 
screw shaft 78 will rotate within bushing holder 68, and correspondingly 
conical splitting screw 76 will rotate. 
Mounted on the inside portion of front frame member 24 is rest bar sleeve 
84. Log rest bar 86 is inserted into rest bar sleeve 84 and is laterally 
adjustable since it is slidable therein. Set screw 88 is tightened to 
provide a rigid connection of log rest bar 86 within rest bar sleeve 84. 
As best seen in the drawings, while the inner end of log rest bar 86 is 
joined via set screw 88 to rest bar sleeve 84, the outer end of log rest 
bar 86 has perpendicular extending sleeve 90. Sleeve 90 telescopically 
fits over stem 92 which in turn is mounted on ground support pad 94. 
Apertures 96 are matingly aligned with aperture 98 of sleeve 90 and a pin 
inserted therethrough to provide a rigid connection between sleeve 90 and 
stem 92 and which in turn provides ground support to stabilize the unit. 
Mounted in vertical relationship to rest bar sleeve 84 is handle sleeve 98 
which receives transport handle 100. Transport handle 100 is locked into 
handle sleeve 98 by a set screw 102. 
In actual operation, the unit works as follows: Transport handle 100 is 
lifted and the unit carried to the desired proximity to a pile of logs. 
The roto-tiller 10 is inserted through the rearward opening of the frame 
between wheels 38 and 40 and mounted as previously described. When the 
roto-tiller is operated, drive shaft 18 rotates which in turn rotates 
drive shaft connector bushing 66 which in turn through its connection to 
screw shaft 78 via shaft insert collar 80 and pin 84 rotates conical 
splitting screw 76. A log 104 is rested at one end on log rest bar 86 and 
is pushed gently against conical splitting screw 76. Rotating conical 
splitting screw 76 grabs into log 104 when the tip of the log splitting 
screw 76 is pushed against log 104. As conical splitting screw 76 digs 
into log 104, it splits the log and pulls the log onto the conical 
splitting screw. Log rest bar 86 aids the pulling action of splitting 
screw 76 by providing sliding friction between log 104 and the log rest 
bar 86. That is to say, the log is self-feeding into splitting screw 76 
without exertion of pressure by the operator. This self-feeding action is 
enhanced by sliding friction provided by log rest support bar 86. Support 
bar 86 may be adjusted to provide a parallel relationship with the ground 
via a height adjustment means provided by pad 94 and stem 92 in 
conjunction with collar sleeve 90. In addition, another important function 
is provided by log rest bar 86. Because of the torque caused by the 
turning of roto-tiller drive shaft 18, there is a tendency to have the 
roto-tiller 10 and the rear portion of attachment frame flip upwardly. The 
log rest bar 86 counteracts this torque and prevents such from occurring. 
As seen in FIG. 3, for transport of the unit, transport handle 100 is 
merely lifted upwardly as indicated by arrow 106 causing the weight to be 
carried by wheels 38 and 40 and the unit may be conveniently rolled to a 
new position. 
The versatility of the unit is demonstrated in FIG. 4 which shows how the 
unit may be conveniently used as the transport dolly for split logs. The 
frame is simply inverted and attached to the roto-tiller shaft via 
mounting tubes 50 and 52 as previously described. A stabilizing connector 
bracket 108 is mounted from the roto-tiller 10 to the log splitting 
attachment frame work via sleeve 110 in conventional fashion. The purpose 
of this is merely to provide increased stabilization. A pair of right 
angle brackets 112 are detachably mounted to the bottoms of side frame 
members 20, 22 in conventional fashion as depicted in FIG. 4. Thus, as can 
be seen with transport handle 100 removed and log rest bar 86 removed, the 
roto-tiller may be simply moved in conventional fashion with the logs 
stacked thereon to provide a transport dolly. 
With virtually minimal and in some cases no additional alteration, the unit 
may also be employed to transport a trailer, a snow plow, a portable 
table, a power take-off drive attachment for other means, a table support 
as well as many other uses. 
For safety purposes, a foot operated shut off switch 114 may be employed 
with the switch electrically connected to roto-tiller 10 via wire 116, 
which runs through the inside of the log rest bar 86 and from there to 
roto-tiller 10. 
In addition, the conical splitting groove 76 may, if desired, have at its 
rearward portion a plurality of spaced apart flared flanges to provide 
increased splitting action. 
It can therefore be seen that the invention accomplishes at least all of 
its stated objectives.