Year: 1888

page_text: Date of Application, 27th June, 1888
Complete Specification Left, 1st Feb, 1889
Comolete Specification Accepted, 2nd Mar., 1889
V.
We EUGENE JOSEPH ALPHONSE LETELLIER and CESAIRE Grandin both of 4 Rue
do Rome, Paris, Franco, Engineers, do hereby declare the nature of this invention
to be as follows:-
This invention relates to dredging apparatus in which two buckets are employed,
the arrangement being such that when one of the buckets arrives at the upper part
of the chain carrying them the other bucket will have reached the ground prepara-
tory to entering it.
A machine embodying our improvements is shown on the annexed illustrative
drawing in which Fig. 1 is an elevation of the improved apparatus and Fig. 2 is a
plan of the gearing. A is a vertical motor cylinder, B is a crank shaft, () is a clutch
disc keyed on but capable of longitudinal motion on the shaft B. D is a pinion loose
on the shaft B and gearing with the toothed wheel E which is keyed upon the shaft F
of the chain wheel of the dredger. H is a toothed wheel also loose upon the shaft B
and gearing with a pinion G keyed upon the shaft F. I is a forkshaped lever for
operating the clutch disc 0. J, J, are the buckets.
According to this arrangement the motor engine works at a speed which is
practically uniform. The engaging and disengaging lever I is operated by the
buckets which act upon the ends a, b. The drawing shows the relative positions of
the two buckets, the one at the upper part being filled with dredgel material, and
the other being in position on the ground and ready to act upon it. The bucket at
the top strikes against the end a of the lever, and causes the latter to oscillate about
the joint K in such manner as to cause the clutch (to engage with the pinion D,
which through the wheel E then transmits to the shaft of the chain wheel the slow
inovement necessary for the working of the lower bucket.
During this operation the upper bucket empties itself, and when the lower bucket
of the clutch lever I,
has completed its work, the top bucket abuts against the part
disengages the clntch Ċ from the pinion D and causes it to ongage with the wheel H

page_text: which Intter through the pinion G transmits to the shaft of the chain wheel, a much
greater speed which is maintained so long as tho filled bucket is asconding and the
empty one is descending.
When the filled bucket reaches the top of the chain it the part a of the lover or
fork is again struck and operatos the clutch C the engaging and disengaging operations
being effected continuously and automatically.
The working of the machine can be stopped by hand by placing the clutch disc
between the wheels Fl and the pinion D.
Apparatus according to this invention will be found to possess many advantages
over dredging apparatus as heretofore mado; for example they will be cheaper to con-
struct, the consumption of power will be greatly reduced as there is not a usoloss
dead weight to be moved, (riz. tho weight of the buckets and their links); the power
required of the engine is therefore considerably reduced and thus economy is offected
n fuel, lubricant and expenses of nunintenance.
DL:- 5711
1000
W. LLOYD WISE,
Per F. J. Brougham,
46, Lincoln's Inn Fields, London, W.C.,
Agent for the Applicants.

page_text: Figuro z is a plan or the gearing.
A is a vertical motor cylinder. B is a crank shaft. C is a clutch disc keyed on
but capable of longitudinal motion on the shaft B. D is a pinion loose on the shaft B,
and gearing with the toothed wheel E which is keyed upon the shaft F of the chain
wheel of the dredger.
His a toothed wheel also loose upon the shaft B and gearing with a pinion G
keyed upon the shaft F. I is a fork shaped lever for operating the clutch disc C.
JJ are the buckets.
According to this arrangement the motor engine works at a speed which is
practically uniform. The engaging and disengaging lever I is operated by the
buckets J, which act upon the ends a b. The drawing shews the relative positions of
the two buckets the one at the upper part being filled with dredged material, and
the other being in position on the ground and ready to act upon it. The bucket at the
top strikes against the end a of the lever and causes the latter to oscillate about the
joint K in such manner as to cause the clutch C to engage with the pinion D which
through the wheel E then transmits to the shaft of the chain wheel the slow movement
necessary for the working of the lower bucket. During this operation the upper
bucket empties itself and when the lower bucket has completed its work the top
bucket abuts against the part 6 of the clutch lever I, disengages the clutch C from the
pinion D and causes it to engage with the wheel H which latter through the pinion G
transmits to the shaft of the chain wheel a much greater speed which is maintained so
long as the filled bucket is ascending and the empty one is descending.
When the filled bucket reaches the top of the chain the part a of the lever or fork
is again struck and operates the clutch U, the engaging and disengaging operations
being effected continuously and automatically.
The working of the machine can be stopped by hand by placing the clutch disc
between the wheels H and the pinion D.
Apparatus according to this invention will be found to possess many advantages
over dredging apparatus as heretofore made, for example they will be cheaper to

page_text: construct, the consumption of power will be greatly reduced as there is not a useless dead
weight to be moved, (viz. the weight of the buckets and their links); the power required
of the engine is therefore considerably roduced and thus economy is effected in fuel,
lubricant and expenses of maintenance.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the sune is to be performed wo declare that what wo
claim is :-
1. In a dredging apparatus a ladder with two buckets arranged in such a manner
that the one bucket arrives filled at the upper end of the ladder just as the
second bucket is about to attack the ground at the other end substantially as
described.
2 in a dredging apparatus of the kind referred to in the provions claim the use
for driving tho upper chain wheel of two speeded gearing in combination with a
clutch operated by the upper bucket the arrangement being such that the speed of the
upper chain wheel is reduced whilst the lower bucket is operating upon the ground
substantially as described.
3. The arrangement of parts of a dredging apparatus constructed and operating
substantially as described with reference to the drawings.
Dated this 1st day of February 1889.
EUGENE JOSEPH ALPHONSE LETELLIER,
Per L. W.
CÈSAIRE GRANDIN,
Per L. W.