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Патент USA US2411689

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Nov. 26, 1946.
2,411,689 '
Filed-Sept. 26, 1944
Farm [1 Z?‘122i
Patented Nov. 26, 1946
Application September 26, 1944, Serial No. 555,805
5 Claims. (01. 254-188)
slidable frictional engagement with the block and
having suitable provision for clamping the fall in
This invention relates, to tackle such, for ex
ample, as is used in loweringand hoisting a ship’s
the block so as to brake the ease of relative move
boat from or to its davits or in lowering and hoist
ing a staging down or up a wall structure and re
lates more particularly to blocks for use in such
ment between the block and fall, or to stop such
movement, at will. Preferably, the block is so
fashioned as to permit ready access to the chan
nel throughout its length and to facilitate the
threading of the fall through the channel.
Objects and advantages of the invention will be
set forth in part hereinafter and in part will be
obvious, herefrom, or may be learned by Practice
with the invention, the same being, realized and
attained by means‘ of the instrumentalities and
combinations pointed out in ‘the appended claims.
The invention consists in the novel parts, con
structions, arrangements, combinations and im
as well are exemplary and explanatory butare not
restrictive of the invention.
The accompanying drawing, referred to herein
and constituting a part hereof,'il1ustrates one'em
bodiment of the invention, and together with the
description, serve to explain the principles of the
Objects of this invention are to make it possible
for an occupant of a ship’s boat, staging or like
heavy structure to lower the structure ‘with ‘tackle
in complete safety and subject to his full control
paid out from a position in or on the structure;
and, to combine-in a. single unit in a commercially
practical, novel and useful fashion the normal
tures of this invention will more fully appear from
the following detailed description when the same
is read in connection with the accompanying
drawing. It is to be expressly understood, how- "i
ever, that the drawing is for the purpose of illus
tration onlyand is not intended to de?ne the,
‘limits of the invention, reference being primarily
Fig. 3 is a view in rear elevation of the embodi
.ment of Fig. 1;
Fig. 4 is a View in front elevation of the embodi
ment of Fig. 1 with the access door in an open po
Fig. 5 is a view in section taken along the line ‘
double or triple type and in general that the block
The head I6_ is preferably non-circular and is
lodged in a complementary recess [8 in a thick
In general, this invention is a block for use
ened section 19 of the frame at one side of the
bank of pulleys l5, the thickened section being
with tackle in hoisting and lowering objects, the
block being providedwith a rope channel through
lw'hich the tackle fall is adapted to pass and lie in
Although three pulleys are shown it will be un
derstood that the block may be of the single,
movably'lodged in the frame ll transversely of
the partitions l5 in coaxial bearings formed in
the partitions l5 and the frame I l.
The head !6 restricts axial movement of the
‘axle l4 in one direction in the block, movement
in the opposite direction being restricted by a
pin ll’ passing through the axle externally of
the frame H at the opposite, end of the axle.
Fig. 2 is a view in side elevation of the embodi
5—5 of Fig. 3.
relation, each being suitably spaced from its ad
jacent pulley by one of a number of spacing par
titions [5, preferably integral with the frame ll.
The axle I4 is provided at one end with an en
larged portion forming a head I6 and is re
Fig. l is a view in top plan of a preferred em
as Everdur forexample, providing a structure of
ample strength and durability for use under con
may be provided with any number of pulleys as
may be required.
had, for this latter purpose to the appended claims.
Of the drawing:
sition; and
The frame I I is preferably a metal casting, such
The pulleys I! may be of wood, or metal and are
journalled for rotation in the frame ll upon an
axle I4 by which they are carried in side-by-side
The above and further objects and novel fea
respect thereof in accordance with known designs.
mechanism of a conventional block and a braking
mechanism for snubbing and locking a tackle fall. 1
ment of Fig. 1;
accordance with this invention, the block having
the block shell or frame I l encasing the usual
gr‘oovedpulleys or sheaves lZ-and having the usual
eye member l3 from which an object (not shown)
to be hoisted or lowered, is adaped to be sus
ditions of severe usage and has the eye member
l3 cast integral therewith as is best depicted in
Fig. 3. It will be understood that the eye mem
ber may be in the form of a strap or hook and
may be journalled in the shell so as to, swivel in
under conditions requiring the tackle fall to be ~
Referring now more particularly to the accom
panying drawing, there is depicted a block H1 in
provements herein shown and described.
bodiment of this invention;
It will be understood that the foregoing general
description and the following detailed description
sometimes hereinafter termed the snubbing sec
tion of the frame. Rotation of the axle I4 is
prevented by its non-circular head shape in 00
action with the recess H3.
The snubbing section IQ of the frame H as
embodied is provided with a channel 20 having
an inlet opening 2! at the top and an outlet open
ing 22 at the bottom. The channel is of an area
transversely of its longitudinal axis sufficient to
accommodate snugly the fall (not shown) of a
tackle of which the block is to form a part so
that the free run of the fall through the block
will be restricted and in effect, snubbed. Prefer
movement or of freeing the fall for movement
without restraint except for the friction between
the fall and walls of the channel 20. To this
end, the embodied braking means is designed to
impart pressure on the fall within the block in
any convenient fashion. As here preferably em
bodied, parallel lugs 48 and 4| extend downwardly
from the bottom face of the braking section IE3
at opposite sides of the outlet opening 22. The
lugs 40 and 4| are apertured to receive headed
anchor pins 42 and 43, respectively, upon which
are slidably mounted a pair of clamping or brak
ably, the channel 20 is longitudinally curvilinear,
ing members 44 and 45 with the lugs 40 and 4|
at least in part, so as to enhance the frictional
therebetween. The anchor pins 42 and 43 serve
resistance offered by the channel to the ,fall of 1.6 to support the members 44 and 45 for limited
the tackle in transit therethrough. As here pref
movement toward and away from each other and
erably embodied, the snubbing section 19 is of
each is secured against dislodgement as by means
substantially rectangular contour and of a thick
of a cotter pin 46.
ness longitudinally of the axle l4 commensurate
The clamping members 44 and 45 are recessed‘
with the diameter of the tackle rope or cable 20 on their respective inner faces immediately below
with which it is to be used. The outer face 23
the opening 22 to provide shallow seats 41 and
of the 'snubbing section I9 is a plane surface
48, respectively, having inclined side walls, for
paralleling the pulleys l2 and is recessed to form
frictionally engaging the tackle fall when thread~
the open channel 24 extending from top to bot
ed between the clamping members.
tom of the braking section, the channel 20 be 25
A clamping screw 49 having a‘knurled head 50
ing substantially ‘U -shaped in cross-section with
and a threaded shank 5| passes through an openits end openings 2! and 22 preferably coaxial
ing 52 at one side of the recess 41 in the member
and with its intervening portion generally sinus
44 into screw threaded engagement with the
oidal in shape so as to provide a “built-in” brak
member 45 in an opening 53 provided for the pur
ing or sn-ubbing action to the free run of the fall 30 pose therein.
Means are provided for capping the rope chan
nel 20 so as to retain the tackle fall therein in
normal course and yet permit access to the chan
nel for the purpose of installing or removing the
Illustrative of the application of this inven
tion, the block 50 may be installed in lieu of the
lower block of a conventional two ‘block tackle.
The tackle fall is passed through the braking sec
tion I9 of the block so as to lie in the channel '20
fall, at will. As here preferably embodied, a cover
plate 24 is hingedly mounted on the frame I i ‘by
with the free end of the fall issuing from the
lower opening 22.‘ This free end is threaded be
means of upper and lower hinges 25 and 26, re
tween the clamping members 44 ‘and .45 :so as to
lie within the recesses 47 and 48, and the cover
member 24 is closed and locked by means of the
spectively, extending laterally from the snubbing
section i9, so as to be movable to and from a po
sition in register with the channel face 23 of
the snubbing section l9. ‘To this end, the‘cover
plate is formed with a plane surface 21, Fig. 4,
paralleling and engaging the channel face 23 in
the vclosed position as is best depicted in Figs.
‘1 and 2.
locking mechanism 3l—'32. The clamping mem
bers 44 and 45 are then tightened on the fall by
screwing up on the clamping screw 49 until the
fall is locked against upward movement through
the braking section 1'9.
With a load applied to the eye 13, the load will
be supported in a given position until the locking
24 in the closed position. The embodied locking
screw 49 is ‘backed off, thereby releasing the
means is of a construction enabling quick release
clamping members 44 and 45 su?ioiently to per
of the cover plate. As here preferably embodied, 50 mit the fall to pay out through the block. Ac
the frame H is provided with upper and lower
cordingly, in lowering a ship’s boat, for example,
Means are provided for locking the cover plate
hinge lugs 28 and 29, respectively, paralleling
an occupant can effect the lowering without re
each other and extending laterally from the side
quiring assistance from the deck. The rate of
of the braking section oppQsite that carrying the
‘lowering will be under complete control through
hinges 25 and 26. A hinge pin 30 journalled in 55 simple adjustment of the locking screw 49.
the lugs 28 and 29 carries a threaded locking
It is apparent that where the vload is to be
bolt 3| extending at a right angle to the pin 30,
hoisted, the fall can be freed in the block by open
the bolt 31 carrying a threaded wing nut 32
ing the cover door 24 to facilitate paying the fall
thereon for coaction with upper and lower look
between the locking members 44 and 45 as it
ing lugs 33 and 34, respectively, carried by the
comes into the boat or onto the staging, Or the
cover plate 24. The lugs 33 and 34 are suitably
arranged on the cover plate 24 so that in the
closed position of the cover plate as in Figs. 1
like as the case maybe.
ment between the block and fall. or slowing such
channel for capping said channel; and, adjust
The invention in its vbroader aspects is not lim
ited to the speci?c mechanisms shown and de
and 2, the locking bolt 31 may be swung into
scribed but departures may be made therefrom
position between the lugs, the locking nut screwed 65 ‘within the scope of the accompanying claims
down against the lugs 33 and 34 and the cover
without departing from the principles of the in
plate clamped securely against the channel
vention and without sacri?cing its chief advan
face 23.
Means are provided in conjunction with the
What I claim is:
braking section IQ for applying a braking effort 70 1. A tackle block having a rope channel in its
of any desired degree to the tackle fall in addi
sheave frame through which the tackle fall is
tion to that provided by the snubbing section I9.
adapted to pass; said channel being curvilinear
The embodied braking means is manually oper
through at least a portion of its length, a cover
able and is capable of stopping relative move
member movable in and out of position over said
able braking means carried by said frame for ad
justably braking the run of said fall through said
longitudinal axis such that said-fall will be sub
stantiallyv snugly engaged by the channel walls
and be snubbed thereby; a cover member hinged
ly mounted on said snubbing section for move
tegral with its sheave frame and at one side of e mentinto and out of a closed position in which
said channel is capped thereby; locking means
the sheave bank of said block; an open rope chan
2. A tackle block having a thickened-‘portion in~
carried by said thickened section for securing
nel in said thickened section through which the
said cover member in its closed position; lugs
tackle fall is ‘adapted to pass, a cover member
movable into and‘out of position over said chan
- extending from said snubbing section at opposite I
sides of ‘the exit opening of said channel; a pair
nel for capping said channel; and, braking means
of braking members for applying a braking effort
to said fall, each member of said pair being in
opposed relation to the other with said lugs in
terposed therebetween; means carried by said
carried by said sheave frame at one end of said
channel for braking the run of said fall through
said channel and means for varying the pressure
of said braking means on said fall.
3. A tackle block having a rope channel
lugs slidably supporting said clamping members
through which a tackle fall is adapted to pass, a 7
cover member movable in and out of position over
for movement toward and away from each other;
and, screw means interconnecting said braking
members for effecting said movement and there
said channel for capping said channel; and,
' by braking said fall.
braking means at one end of said channel for ap
5; A' tackle block comprising a unitary metal
plying a braking effort to said fall, said braking 20
means comprising braking members carried by , casting forming a sheave section, a snubbing sec
the block frame between which said fall is adapted ~ .tion at one side of said sheave section and a load
supporting member depending from said sheave
to pass, recesses in said members in opposition
to each other providing a braking section for
engagement with said fall, and means for mov
ing said members relative to each other to apply
section, said snubbing section having a plane sur
face portion transverse to the sheave axis of the
block recessed to provide a rope channel extend
ing from top to bottom of said snubbing section;
a sheave axle'removably carried by said casting;
said axle having an enlarged head portion seated
' tackle fall, said section'having a planar surface ‘%0 in a complementary recess in said snubbing sec~’
tion; a metal closure member for said channel;
portion extending transversely of the sheave axis
and, adjustable braking means carried by said
of the block, said planar surface portion‘ being
casting below the outlet opening of said channel
recessed from top to bottom to provide a sub
for braking the run of said fall through said chan
stantially U-shaped open top channel in which
the tackle fall is-adapted to'run, said channel 35 nel.
having a cross-sectional area transversely of its
a braking effort to said fall.
4. A tackle block having a thickened portion
of its frame forming a snubbing section for the
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