An Improved Revolving Harrow.
Year: 1893

page_text: Date of Application, 27th May, 1893-Accepted, 16th Sept., 1893
COMPLETE SPECIFICATION.
An Improved Revolving Harrow.
I, HERMANN JAENISCH, of Tschirnau, near Guhrau, Prussia, in the German
Empire, Inspector, do hereby declare the nature of my said invention and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement :-
The object of this invention is to effect improvements in revolving harrows; the
improvements being distinguished, as compared with other devices for a similar
purpose, by its easy manipulation and its advantageous arrangement.
And in order that my said invention may be particularly described and ascertained,
reference is hereby made to the accompanying drawings, in which similar letters of
reference indicate corresponding parts.
Fig. 1 is an elevation of the invention.
Figs. 2, 4, 5 and 6 are detail views of parts of the mechanism.
Fig. 3 is a plan of the harrow.
The
The mechanism which enables the harrow to be raised and lowered, and also to
be inclined relatively to the ground, is mounted upon the rear crank axle b.
toothed wheels d and, the shaft g, and the bevel wheels m and n set the harrow e
in rotation, as soon as the rear wheel w', which is firmly connected with the toothed
wheel d, revolves, when the harrow is working. The wheelf can be thrown out of
gear by the lever a, so that when the apparatus is travelling from place to place the
harrow is not caused to rotate.
The vertical rotary axle
is furnished with a spring, which moves in a groove p
of the hub of the wheel n. The hub of the wheel n turns in the collar bearing o
formed in one with the axle b. In consequence the cot, the harrow can be raised
in a vertical direction while rotating, whenever an obstruction such as a large stone
interferes with the action of the harrow, or when the latter is being transported etc.
The following parts impart this vertical motion :
The
The axle g is provided with a groove, at its upper part, carrying a collar y'.
This collar q is connected with the link t by a fork, so as to form a joint.
The link t consists of two flat iron bars, (as also shown in Fig. 2) between which
is fitted a left hand screws, by which the nut can be moved up and down.
The nut z is connected with the crank pin w. The crank pin w is so arranged
upon its crank that it can be adjusted by the right hand threaded screw r.
upper end of the spindle is fitted with a toothed wheel r¹. The screw spindle s
has a quadrangular end, upon which the toothed wheel s', provided with a handle,
may be keyed. When the toothed wheels s' and ' are in gear, the toothed
wheels may be turned with the wheel r', and the crank pin w thereby raised or
lowered.
Upon the shaft of the crank u the toothed wheel is keyed, which gears with the
toothed wheel k arranged to turn freely on a fixed pin. The toothed wheel k
gears with the toothed wheel i. which is mounted on a sleeve upon the shaft g,
for the purpose of being connected or disconnected to or from the toothed
wheel by the aid of the lever a¹. When the wheel i is in gear, the rotation
of the shaft y is transmitted to the crank u as shown diagrammatically in Fig. 6,
and the harrow e is thereby slowly raised or lowered as required. When it is
necessary to retain the harrow in a raised position, as shown in Fig. 1, the pawl v
is caused to engage the ratchet wheel v, and thus hold the crank u and crank pin w
in the required position.
The spiral spring h upon the shaft g, has for its object to maintain the wheels f
and in gear with the toothed wheels d and k.
The arrangement shown in Figs. 3 to 5 also serves to impart an inclination to the
[D037

page_text: harrow, relatively to the ground. A screw y is provided with a right and a left
handed screw thread (Fig. 3) is turned by a key, and thus imparts a partial rotation
to the axle b, and an inclination to the harrow, relatively to the direction in which
the screw y is turned. The connection between the rear axle b and the parts a of
the frame of the apparatus is effected in the manner shown in Fig. 4.
The device
is used to give a slant position transversely to the direction in which it is being
driven, the device being shown in detail in Fig. 5. The wheel c turns on the
axletree, which is secured in the axle in such a manner as to be adjustable
vertically therein. The axletree is furnished with a slide ct into which a thread
is cut. Various positions may be given to relatively to b by means of a screw
with a handle ', ' being held in the guides c². The harrow is thus inclined in a
direction relatively to the direction of driving. By combining the above described
adjustments, any desired inclination may be given to the harrow; whenever it is
required to bring only one part of the harrow into action.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is
1. A device for raising or lowering rotating harrows while at work, characterized
by a crank mechanism urs w t, in connection with the rotary axis of the harrow,
and a toothed wheel transmission l ki, the whole being arranged in such a manner,
that the raising or lowering of the harrow is effected by a shaft g, whereby, after
the toothed wheel has been thrown out of gear, the fixing of the harrow in its
elevated position is effected by a ratchet wheel v, substantially as herein before
described and illustrated by the drawings.
2. A device for imparting an inclined position relatively to a horizontal plane to
harrows of the kind above claimed, characterized by a right and left handed
screw y, which inclines the axle relatively to the direction in which the driving
takes place, in combination with an adjusting device c' which causes the harrow
to assume an inclination relatively to the ground, substantially as herein before
described and illustrated by the drawings.
3. The general construction, arrangement, and combination of the several and
respective parts, together forming my invention of an improved revolving harrow,
substantially as herein before described and illustrated by the drawings.
Dated 27th May 1893.
GEO.
DOWNING,
8, Quality Court, London, W.C., Agent.