Improvements in Road Picking Machines.
Year: 1892

page_text: Date of Application, 18th July, 1892
Complete Specification Left, 16th May, 1893-Accepted, 24th June, 1893
PROVISIONAL SPECIFICATION.
Improvements in Road Picking Machines.
I, ARTHUR HERBERT WALLIS, of North Hants Iron Works, Basingstoke, in
the County of Hampshire, Engineer, do hereby declare the nature of this invention
to be as follows :-
In the Specification No. 19,104 of 1891 is described a machine which might be
an appliance to a road roller, for picking or loosening the surface of a road, this
machine or appliance having several picking tools which are caused to reciprocate
either by steam or by cams with weights or springs acting on levers or arms
carrying the tools. My present invention relates to improved means of moving the
picking tools. According to one arrangement I attach each tool to a cylinder that
can move up and down between guides and I-connect the piston of this cylinder to a
crank on a revolving shaft. As the piston makes its upstroke it compresses the air
above it raising the cylinder and tool, and as the piston makes its downstroke, the
cylinder and tool descend, the air in the cylinder forming an elastic cushion.
Instead of such an air cylinder suitable springs may be employed. Otherwise, the
revolving shaft may have on it cams which raise guided stems carrying the picking
tools against weights or springs or against the pressure of air or steam in pistons
attached to the stems. According to another arrangement cach picking tool is
connected to the trunk of a differential piston which is always subject to steam
pressure on the annular area on its underside, whereby the picking tool is raised
when the pressure above is released, the tool being then impelled down by the
excess of pressure on the larger area on the upper side of the piston.
When steam
is employed in this manner, or in cases where the steam is alternated below as well
as above the piston, I preferably actuate the valves by tappets, or steam pressure,
or I so arrange the ports and valves that the stoppage of the piston when the blow
is delivered causes the movement of the valves to alternate the action of the steam.
I connect each picking tool to the stem which works it by two open joints one
before and one behind, keeping the tool always engaged with the one or the other
by springs, which permit the tool to partly turn on either joint and so release itself,
while the machine travels in either direction.
Dated this 18th day of July 1892.
ABEL & IMRAY,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Road Picking Machines.
I, ARTHUR HERBERT WALLIS, of North Hants Iron Works, Basingstoke, in
the County of Hampshire, Engineer, do hereby declare the nature of this invention
and in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement :-
In the Specification No. 19104 of 1891 is described a machine, which might be
an appliance to a road roller, for picking or loosening the surface of a road, this
machine or appliance having several picking tools caused to reciprocate either by
steam or by cams with weights or springs acting on levers or arms carrying the
tools. Also in the Specification No. 18,843 of 1890 are described machines of
various forms in which picking tools, mounted on a travelling truck, are caused to
reciprocate so as to pick the surface of a road. My present invention relates to
improved means of actuating the picking tools in machines of the kind above
referred to, as I shall describe referring to the accompanying drawings, in all the
figures of which similar letters are employed to denote corresponding parts. The
[Price 8d.1

page_text: apparatus according to my invention, of which I shall describe several modified
forms, is in all cases carried on a travelling truck, road roller, traction engine or
other suitable vehicle, and in all cases the working of the tools is effected
by cranks on a shaft caused to revolve by any suitable motor on the vehicle
or by the travel of the vehicle itself. As shewn in Fig. 1 a frame F attached
to the body of the vehicle V carries a. crank shaft C. Each crank, of which
there may be several set at various angles on the shaft, is linked to a block B
working in guides G and having attached to it a piston P working in an
air cylinder A, which has lateral apertures about the middle of its length.
The cylinder A is free to slide in the guides G, and has jointed to its end a
picking tool T the holder of which is held up by side springs arranged as
the springs in Fig. 2, which shews a modified construction according to which
the tool holder is connected to the cylinder by two open joints, so that it is
free to cant to either side and therefore can yield without fracture of the parts even
if the vehicle were moved backwards with the tool driven into the road. As the
crank revolves, causing the piston P to reciprocate, the air enclosed between it and
the ends of the cylinder A operates as a spring cushion deadening blows and
allowing the tool T to operate even when the level of the road surface considerably
varies.
As shewn in Fig. 3, the guides G can oscillate on a joint J, so that the tool T
which in this case may be rigidly fixed to the cylinder, having a canting as well as
up and down motion is made to perform a kind of digging action on the road
material. In Fig. 34, a pair of springs S are interposed between the block B and
a lower sliding block D carrying the tool T; these springs acting instead of the air
cylinder.
According to the modification shewn in Fig. 4 the cylinder A is rigidly fixed to
the guides G and is jointed at J to a forked radius R, pivotted on a projecting
frame F. In this case, the guides move up and down with the cylinder as the
block Band piston P reciprocate and at the same time, owing to the movement of
the crank in a circular path, a rocking motion, as well as the up and down motion,
is imparted to the guides and cylinder, so that the tool has a digging action. By
employing a sufficiently strong piston rod the guides G may be dispensed with.
Obviously the position of the air cylinder and piston might in each case be
inverted, the cylinder being jointed to the crank, and the picking tool attached to
the piston rod.
4
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I would have it understood
that I make no general claim to apparatus mounted on a travelling vehicle working
reciprocating tools to pick or loosen the surface of a road, nor do I claim the inter-
position of an air cylinder and piston between a crank and a percussive tool
operated by it as in a pneumatic hammer or stamp, but what I claim is:
1. In a road picking machine, in combination with a travelling vehicle, a crank
shaft having its cranks linked to pistons working in air cylinders, to which picking
tools are attached, or inversely, substantially as described.
2. Connecting each picking tool to the air cylinder by two open joints operating
in conjunction with springs, substantially as described with reference to Fig. 2.
3. Mounting the cylinder and guides on a joint on which they are caused by the
crank to oscillate, substantially as described with reference to Figs. 3 and 34.
4. Jointing the cylinder and guides to a radius, substantially as described with
reference to Fig. 4.
5. Substituting springs for the air cylinder, substantially as described with
reference to Fig. 3A.
Dated this 16th dow of W 1000
ABEL & IMRAY,
Agents for the Applicant.