AN IMPROVED BRAKE FOR PULLEY BLOCKS
Year: 1884

page_text: I, THOMAS KIRKLAND, Junior, of West Gate Iron Works, Mansfield, in the
county of Nottingham, Engineer, do hereby declare the nature of my invention
for AN IMPROVED BRAKE FOR PULLEY BLOCKS to be as follows:-
Each pulley block side plate has a vertical slot formed in it, in which one end of
a friction block slides, the upper side of this block is double V grooved, its whole
length, one end of the block being deeper than the opposite end; in the groove, a
reversely shaped projection on the lower side of a screwed wedge shaped nut,
slides, the sliding being effected by a screw threaded axle pin passed through it,
the ends of which revolve in holes, in the side plates, the revolution of the axle pin
may be caused by either a hand wheel, or a grooved pulley round which a rope is
passed for the use of the attendant, the hand wheel or grooved pulley may be
secured on the screwed axle pin, either inside or outside the side plates, the under-
side of the friction block is V grooved, so as to press upon the rope or chain
running in the pulleys, and securely grip them when the friction block is lowered
by the revolution one way, of the screwed axle pin, the friction block being raised.
quite clear of the rope or chain, when the screwed axle pin is revolved the reverse
way.
The above described brake may be applied to either the upper or lower pulley
block of each pair.

page_text: ''
I, THOMAS KIRKLAND Junior, of West Gate Iron Works, Mansfield in the county
of Nottingham, do hereby declare the nature of my invention for AN IMPROVED
BRAKE FOR PULLEY BLOCKS, and in what manner the same is to be performed, to
be particularly described and ascertained in and by the following statement :—
DESCRIPTION OF THE DRAWINGS.
•
Figure 1, shows an edge view of a pulley block, with a grooved pulley hereafter
referred to, shown in section. Figure 2 shows a side view, with the grooved pulley
and one side plate removed, Figure 3 shows a side view of the grooved pulley.
Each pulley block side plate A, has a vertical slot formed in it, in which one end
of a friction block B slides, the upper side of this block is double V grooved its
whole length, one end of the block being deeper than the opposite end, in the
groove a reversely shaped projection on the lower side of a screw threaded wedge
shaped nút C slides, the sliding being effected by a screw threaded axle pin D
passed through it, the ends of which revolve in holes in the side plates, the revo-
lution of the axle pin may be caused by either a hand wheel, or as shown by a
grooved pulley E round which a rope El is passed for the use of the attendant, the
hand wheel or grooved pulley inay be secured on the screwed axle pin either inside
or outside the side plates, below the grooved pulley E is a smaller grooved pulley F
and two studs G, one on each side, between the studs and the smaller pulley, the
crossed rope E¹ is passed, by which the attendant is enabled to put considerable
pressure upon it, and readily traverse the nut C either way, the underside of the
friction block B, may be either plain as shown in the Drawings, or it may be
V grooved so as to press upon the rope or chain running in the pulleys and securely
grip then when the friction block is lowered, by the revolution one way of the
screwed axle pin, when revolved the reverse way, the friction block is raised quite
clear of the rope or chain.
Having now particularly described and ascertained the nature of my said
Invention, and in what manner the same is to be performed, I declare that what
I claim is:
'
The construction and employment of the improved brake for pulley blocks,
substantially as described and illustrated in the Drawings annexed.
Dalth antl
& Demo 100