Improvements connected with Pulley Blocks for Ropes or Chains.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvements connected with Pulley Blocks for Ropes or Chains.
We, JOIN HARRIS, of 19, Berwick Street, South Shields, in the County of
Durham, Engineer, and HENRY NEWHAM, of 156, Howdon Road, North Shields,
in the County of Northumberland, Engineer, do hereby declare the nature of this
invention to be as follows:-
-
This invention relates to a novel improvement in pulley blocks and in means
or appliances which enable a rope or chain to be inserted or removed in an
easy manner and the side gap shut automatically the instant a strain, such
as that of a weight, be applied.
ין
To carry our invention into practice, we form a slot hole radially in the
material of which the block is composed from a shutt bolts centre, so that the
bolt carrying the sheave can be thrown upwardly radially in the slot "the shutter
being thus caused to uncover the gap by which a rope or chain can be entered
or through which it can be removed.
1
The sheave bolt passes through the shutter and is partly carried by it and
partly by the block, so that it has a full bearing.
The shutter is pivotted on a pin or bolt secured to and projecting from one
cheek of the block and forms a side wall, its upper end being lipped to ride onto
a stud or projection on the stock of the block which said lip is caused to bite
when thrown over by a strain on the rope or chain that may be rove on the
sheave, the grip of the lip being doubly ensured by down strain on the sheave
as soon as pressure is exerted, this being automatically effected by reason of the
sheave partaking of the radial motion in the slot.
The shutter is on one side or front of the block only and when the strain is
removed, said shutter can be readily moved over by hand, the sheave bolt moving
up the radial slot to free the gap for that purpose.
Dated this 17th
e
1000
Agent for the said John Harris and Henry Newham.
3
COMPLETE SPECIFICATION.
Improvements connected with Pulley Blocks for Ropes or Chains.
We, JOHN HARRIS, of 19, Berwick Street, South Shields, in the County of
Durham, Engineer, and HENRY NEWHAM, of. 156, Howdon Road, North Shields,
in the County of Northumberland, Engineer, do hereby declare. the nature of this
Price &11

page_text: 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 relates to a novel improvement in pulley blocks and in means
or appliances which enable a rope or chain to be inserted or removed in an
easy manner and the side gap shut automatically the instant a strain, such 5
as that of a weight, be applied.
To carry our invention into practice we form a slot hole radially in the
material of which the block is composed from a shutter bolts centre, so that the
bolt carrying the sheave can be thrown upwardly radially in the slot, the shutter
being thus caused to uncover the gap by which a rope or chain can be entered!
or through which it can be removed. The sheave bolt passes through the
shutter and is partly carried by it and partly by the block so that it has a full
bearing..
The shutter is pivotted on a pin or bolt secured to and projecting from one
cheek of the block and forms a side wall, its upper end being lipped to ride on to
a stud or projection on the stock of the block which said lip is caused to bite
when thrown over by a strain on the rope or chain that may be rove on the
sheave the grip of the lip being doubly ensured by down strain on the sheave
as soon as pressure is exerted, this being automatically effected by reason of the
sheave partaking of the radial motion in the slot.
The shutter is on one side or front of the block only and when the strain is
removed said shutter can be readily moved over by hand, the sheave bolt moving
up the radial slut to free the gap for that purpose.
Our invention will be better understood by reference to the annexed drawings.
Figure 1, detached perspective elevation of the block strap.
Figure 2, detached perspective elevation of the throw over lever or shutter.
Figure 3 side elevation of pulley block with shutter thrown open such as when
a rope or chain has to be looped over the sheave or removed therefrom.
Figure 4 edge elevation of Figure 3 but with the shutter closed.
The strap is composed of a side piece A, a top overhanging lip B with hole'
for the attachment of the swivel hook C by or from which the article can be
suspended. The side strap A is provided with a curved slot D in a swelled out
part E and has a return bottom F with an upright ear or cheek G in which in a
corresponding swelling is a curved slot H coinciding with the slot D of the side
strap A.
These curved slots D and H are concentric with a pivot bolt hole I of the
car G and is preferably screw threaded for reception of a screw bolt J on which
the shutter K has a throw over motion by hand when desired.
The bolt L by which the sheave M is held between the ears E, G, is secured by
the nut N to the shutter K so that it and the sheave M can have a concentric
motion about the bolt J when the shutter K is thrown over as in Figure 3 for
the purpose before mentioned.
The attachment of the shutter K by the bolt J to the ear G is as a pivot and
when the shutter K is closed as by the edge elevation Figure 4 an inwardly
overhanging lip P engages over an upstanding edge Q of the overlap B and
supports the shutter K and in conjunction with the strap A forms the frame
within which the sheave M is held.
It will be observed that when the sheave M is lowered by the shutter K the
bearing of the load is borne by the bolt L takes on the bottoms of the slots D, H,
and it is only when the rope R or chain has to be fitted in or removed from the
sheave M that the shutter K needs being moved over as at Figure 3.
It is not necessary to return the shutter K to its supporting or closed position
because from the eccentric hanging of the shutter K the moment the load gets
its grip on the rope or chain the sheave M becomes pulled down and this forces
the bolt L to the bottom of the slots D, H, and the shutter K into a locked posi-
tion as at Figure 4.

page_text: Having now particularly described and ascertained the nature of this said
invention and in what manner the same is to be performed we declare that what
we claim is :-
1. A pulley block in which the sheave M can be moved radially from a pivot
point by action on a part supporting frame or shutter K as represented on the
annexed drawings for the purposes explained.
2. A pulley block provided with slot holes D, H, in the ears E, G, respectively
and having a shutter plate K connected to the sheave carrier bolt L movable
from a pivot bolt J as and for the purposes specified.
3. A pulley block in which the sheave M can have a motion out of the vertical
line by part of the sheave framing moving from a pivot bolt to facilitate the
easy insertion and removal of the hauling rope R or chain as shown and described.
The 3rd day of December 1898.
H. GARDNER,
Patent Agent, 166, Fleet Street, London,
Agent for the said John Harris and Henry Newham.