Improvements in or relating to Apparatus for Moulding Propeller Blades.
Year: 1891

page_text: Date of Application, 6th July, 1891
Complete Specification Left, 4th Apr., 1892-Accepted, 7th May, 1892
PROVISIONAL SPECIFICATION.
Improvements in or relating to Apparatus for Moulding Propeller
Blades.
We, EDWIN JAMES PRESTON of the firm of J. Stone and Company of
Deptford in the County of Kent and JAMES SHAW MCLAREN in the employ of
the said firm Engineers do hereby declare the nature of this invention to be as
follows:-
This invention has for its object to reduce the cost of moulding propeller blades.
On a segmental or other base piece, we mark as many circular lines as is
required for various diameters of propellers. These lines form about the sixth or other
required part of the circumference of the various diameters. To this base picce
are attached either by bolts or otherwise any suitable mumber of vertical supports
or brackets, the bottom part or foot of same being slotted so as to allow of their
being moved on the base piece to or from the centres from which the aforesaid
lines are struck so as to enable the sweeping-up board to be set to any required
diameter.
I prefer the central support to have no slot in it, but to be fixed permanently
to the base piece. To the sweeping up board are attached links the lower ends of
which are attached to the top of the brackets or supports and are free to move in
a vertical or circular direction, their object being to enable the sweeping up board
to be moved up or down, so as to allow of it being set to any pitch required. Or
the links may be guided vertically in the supports and lateral slots provided in
the sweeping up board to permit of the free up and down movement of the board
according to the required pitch of the propeller blades.
By the use of this apparatus the sweeping up piece can be adjusted for any kind
of blade whereas heretofore a fresh one had to be made for each propeller.
Dated this 6th day of July 1891
JENSEN & SON,
77, Chancery Lane, London, W.C.
COMPLETE SPECIFICATION.
Improvements in or relating to Apparatus for Moulding Propeller
Blades.
We, EDWIN JAMES PRESTON of the firm of J. Stone and Company of
Deptford in the County of Kent and JAMES SHAW MCLAREN in the employ of
the said firm Engineers 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 :—
This invention has for its object to reduce the cost of moulding propeller blades.
For this purpose we construct our apparatus, consisting of four main portions
ris. a base piece secondly brackets or standards which are adjustable thereon
according to the diameter of the propeller to be moulded, thirdly a sweeping-up
piece, and fourthly links which connect the standards and the sweeping-up piece
and whereby the latter can be adjusted to the required pitch.
In the accompanying drawing we have shewn a suitable form of making the
apparatus Fig. 1. being an elevation Fig. 2. a plan and Fig. 3. a vertical cross
section on line - Fig. 1. a is the base piece which may suitably as shown be
of a segmental shape. To this base piece are attached either by bolts i as shown
or in any other suitable manner, a number, five in this example, of vertical supports,
LD037

page_text: standards or brackets e the bottom part or foot of same being slotted as shown so
as to allow of their being moved on the base piece a to or from the centre of the
propeller to be moulded so as to enable the sweeping-up piece e to be set to the
required diameter of propeller. The supports have stays c. The sweeping-up
picce e is fixed to the upper vertically adjustable parts of the supports c.
These parts or links dare by bolts g or by other suitable means fixed to the sweeping-
up piece e while their lower ends are fixed to the top of the supports c by bolts f
and so that they and the sweeping-up piece e can be moved up or down so as to
allow of the piece e being set to any pitch required. The links are shown here
as sliding upon the supports c being slotted for such adjustment. They may be
guided vertically on the supports c the latter being then provided with guide lugs.
Or instead of the vertically moved or guided links & we may use links which are
attached at one end to the supports and at the other end to the sweeping-up
piece e and free to move in a vertical or circular direction, their object being in
that case also to enable the sweeping-up piece e to be moved up or down so as to
allow of its being set to any pitch required. We may make the central one of
the supports e without slot and to be permanently fixed while the other supports
are made, to shift on the base piece a. Lateral slots e¹ are provided in the
sweeping-up piece e to permit of the free up-and-down-movement of same. By the
use of such an apparatus the sweeping-up piece can be adjusted for any size and
pitch of blade (within certain limits) whereas heretofore a fresh one had to be made
for each propeller.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is
1. An apparatus for moulding propeller blades consisting of a base piece,
standards adjustable thereon according to the required diameter, a sweeping-up
piece, and links, which connect the standards and the sweeping-up piece and
whereby the latter is rendered adjustable according to the required pitch sub-
stantially as set forth.
2. The construction of apparatus for moulding propeller blades as described with
reference to the drawings.
Dated this 4th day of April 1892
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.