Boring Rods and the like.
Year: 1888

page_text: Boring Rods and the like.
Wo, JOHN WILLIAM DOCWRA and COLIN DOOWRA both of the firm of Thomas
Docwra & Son of King Henry's Walk Islington N Contractors for Public Works
do hereby declare the nature of this invention to be as follows
--
Well boring rods, pump rods, and the like are liable to break and when they do so
it is often difficult to recover the portions of rod below the fracture owing to the
absence of any projection to take hold of. Various constructions of apparatus for the
purpose have been used or proposed but they have all so far as we know been open to
objection in practice, some owing to their liability to slip and thus loose their grip
of the rod to be recovered, others owing to the difficulty or impossibility of releasing
them from the rod when, for any reason, it is advisable to do so; as, for example,
where it is, after the rod has been gripped, found desirable not to attempt the raising
of the rod, owing to some special obstruction or cause of resistance
Now this invention has reference to a simple construction of apparatus whereby
rods of sections such as usually employed-for example square or round-may, when
broken, be readily gripped and recovered, for which purpose we employ a tubular
device of an internal form as seen in cross section that may resemble the external form
of the rod, but larger, so as to pass freely over the broken end of a rod to be recovered,
and within this tubular device we provide an eccentric or eccentrics with seriated
periphery or peripheries which whilst the apparatus is being lowered over the end of
a rod will not grip it but during an upward movement of the apparatus will do so.
A spring or springs is or are arranged to retain the eccentric or eccentrics in a
normal position and a cord or wire or cords or wires is or are provided whereby the
eccentric or eccentrics can be caused to free the rod after it has been gripped, if it be
desired to raise the apparatus without the rod The apparatus described can be
fastened to one end of a tube the other end of which can be secured to the boring
rods whereby the apparatus is to be lowered for use. According to a modification a
wedge or wedges can be employed in lieu of the eccentric or eccentrics.
.
L
FL 1
CT1000
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C.,
Agent for the Applicants.

page_text: COMPLETE SPECIFICATION
Improved Apparatus for Raising and Recovering Broken Well
Boring Rods and the like.
We, JOHN WILLIAM DOOWRA and COLIN DOCWRA both of the firm of Thomas
Docwra and Son of King Henry's Walk Islington N. Contractors for Public
Works, 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
--
Well boring rods, pump rods, and the like are liable to break and when they do so
it is often difficult to recover the portions of rod below the fracture owing to the
absence of any projection to take hold of. Various constructions of apparatus for the
purpose have been used or proposed but they have all so far as we know been open to
objection in practice, some owing to their ability to slip and thus lose their grip
of the rod to be recovered, others owing to the difficulty or impossibility of releasing
them from the 1od when for any reason, it is advisable to do so, as for example,
where it is, after the 1od has been gripped, found desirable not to attempt the raising
of the rod, owing to some special obstruction or cause of resistance.
Now this invention has reference to a simple construction of apparatus whereby
rods of sections such as usually employed-for example square or round-may
when broken, be readily gripped and recovered-for which purpose we employ
a tubular device of an internal form as seen in cross section that may resemble the
external form of the rod, but, larger, so as to pass freely over the broken end of a rod
to be recovered, and within this tubular device we provide an eccentric or eccentrics
with serrated periphery or peripheries which whilst the apparatus is being lowered
over the end of a rod will not grip it but during an upward movement of the
apparatus will do so. A spring or springs is or are arranged to retain the eccentric
or eccentrics in a normal position and a cord or wire or cords or wires is or are
provided whereby the eccentric or eccentrics can be caused to free the rod after it has
been gripped, if it be desired to raise the apparatus without the rod. The apparatus
described can be fastened to one end of a tube the other end of which can be secured
to the boring rods whereby the apparatus is to be lowered for use. According to a
modification a wedge or wedges can be employed in lieu of the eccentric or
eccentrics.
In the accompanying sheet of illustrative drawings
Fig. 1 18 a vertical section; and
Fig. 2 an end view of one form of apparatus according to this invention, a part of
a broken boring rod being shown held therein.
Fig. 3 is a similar view to Fig. 1; and-

page_text: In Figs. 1 and 2, 1 is a tube within the lower part of which are secured three
blocks 2. which together with the adjacent lower edge of the tube are bevilled
or inclined as shown in order to facilitate passing over the end of a broken rod
by lowering the device into such a position that on a return movement thereof it will
grip the rod, which will then be raised as the device is drawn up.
In lieu of bevilled blocks 2, the lower end of the tube may be contracted and made
of bell mouth form. 3 is an eccentric or cam having a serrated periphery, and
mounted so as to be able to turn upon a pin 4 that traverses and is fixed in two
opposite parts of the tube. 5 is a plate fixed in the tube opposite to the eccentric or
cam 3; between this plate (which may advantageously be roughened or serrated) and
the eccentric or cam the broken rod 6 to be raised is gripped.
In lieu of this plate 5, a second eccentric or cam similar to 3 might be used.
The eccentric or cam 3 is kept normally sufficiently forward in the direction of the
arrow to cause it to engage with a broken boring rod, by any suitable means such as
a spring or a band 7 of elastic material as shown. When a band 7 is used it may be
arranged in a recess 8 in the outer-side of the tube one of its ends being secured to the
eccentric or cam and the other to tube. 9 is a wire or cord by which the eccentric or
cam 3, to which it is secured can be caused to clear or set free the boring rod 6 when it
is desired to raise the apparatus without the rod. This wire or cord is led away
through the tube and connected boring tube 10 above to a position in which it can
be operated conveniently.
The tube 1 is secured to the lower end of the tube 10; its upper end is secured to
other tubes or rods whereby the apparatus can be raised, or lowered for use
In Figs. 3 and 4 a wedge 3* having a serrated or roughened surface is employed in
lieu of the eccentric 3 for gripping a broken rod. This wedge works on an inclined
surface in the example this surface is the base of a dove-tailed recess 11 in a fixed
plate 12.
Whilst passing the apparatus over the end of a rod 6 the wedge is kept up to leave
sufficient space between it and the plate 5 to freely receive the rod. The wedge is then
released and bears against the rod and when the apparatus is raised the wedge has the
effect of jamming the rod between itself and the plate, the grip being in proportion
to the weight or resistance of the rod to rising
Having now particularly described and ascertained the nature of this inven
tion and in what manner the same is to be performed we declare that what
we claim is:
-
Our improved apparatus, substantially as described and illustrated, for raising and
recovering broken well boring rods and the like.
D
11
101 1
T
1000