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Патент USA US2407656

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Sept. 17, 1946.
1'. G. Dl sANTi
SGAFFOLD
2,407,655
, .
Filed May 3, `1945
4 Sheets-Sheet l
ÍNVENTOR.
Thomas G. 0:1 Santi
ATTO kusss
Sept. 17, .1946.`
_T'. G. DI lSANTI
-„
scAFFoL?
Filed May 5, 1945
' 2,407,655
_
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'
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'
4 Sheets-Sheet 3
l\ \`
K’
ÍNVE-NTOR.
` \ Thomas G. Dl.' Sanft'
F >
BYGLLUJWäW'M
ATToRNEss
`
Patented Sept. 17, 1946
.
2,407,655
UNITED STATE s PATENT OFFICE
2,407,655
SCAFFOLD
Thomas G. Di Santi, Newark, N. J.
Application May 3, 1945, Serial N0. 591,686
5 Claims. (Cl. 304-18)
1
i
-This invention relates to scaffolds and refers,
more particularly, to adjustable scaifolds which
can be used in ‘building operations and for other
Figure 4;
Figure 1;
lowered at will.
An object of the present invention is `the pro
vision of a scaffold which is simple in construc
tion and inexpensive to manufacture and which
can be conveniently utilized in building oper
ations of various types.
`Another object is the provision of a scaffold
which is reliable and safe in operation and which
Figure 1;
be caused by any negligence in operating the
scaffold.
’
Yet another object is a provision of a scaffold
which is provided with a continuously operating
braking means holding the scaffold, the scaf
fold being movable only when these means are
maintained in a released position.
Still another object is the provision of a con
veniently operated locking device which may be
used to facilitate continuous movement of the
,
Figure 6 is a section along the lines E-B of
kinds of work and which are so constructed that
the platform of the scaffold can be raised and
is so constructed that no serious accidents can
2
Figure 5 is a section along the line 5-5 of
'
‘
Figure 7 is a section along the lines ‘I-l of
Figure 8 is a detail view illustrating the lever
Vwhich operates the brake mechanism.
The scaffold frame shown in the drawings con
sists of four rigid frame‘elements B, 9, III, II, at
tached permanently to two sleeves I2. I3, sliding
over two vertical posts I4, I5.
Two other posts
carry a similar scaffold frame (not shown).
The
ñooring of the scaffold, which is also not shown,
extends between the two scaffold frames.
The scaffold frame is prevented from sliding
down the vertical rods I4, I5 by two brakes shoes
I6, I 'I, made of wear resistant material and in
contact with vertical rods i4, l5, through opene
20 ings I8, IB, provided in the sleeves l2, I3. The
brakes I 6, I'I are held in position by two bars
2li, 2l having a common swivel joint on pinion
22 in the center of rigid members 8 and Il] at
an equidistant point between sleeves I2; I 3. A
'.25 U-shaped hanger 23 is connected to the frame
members 8 and Ill by any suitable means and
is used for hooking the block and tackle ropes
speciñcation.
'I0 to hoist the scaffold.
In accomplishing the objects of the present
It is apparent that the scaffold as a Whole
invention, it was found desirable to provide a [3 will have a normal tendency to exert pressure
upon brakes I6, I'I causing these latter to be
scaffold having brake shoes which ,are urged
Scaiîold.
Other objects of the present invention will
become apparent in the course of the following
by springs to press continuously against the posts
of the scaffold and thereby hold it securely in
position. The brakes are released through the
come wedged firmly against vertical posts I4, I5.
The links 20 and 2l are connected 'to the brake
shoes I6 and I'l with a certain amount of play.
The wedging action is further increased by ten
manipulation of a lever which can :be locked in ;
sion of springs 24, 25 through a system of con
an inoperative position through the use of a suit
necting links 26, 2'! mounted at one end on pinions
able locking device.
28, 29 on brakes I6, Il, and at the other end on
The invention will appear more clearly from
pinions 30, 3l in folding arms 32 and 33. Arm
the following detailed description when taken
in connection with the accompanying drawings 40 32 has one end fastened to a pinion 34 at the
lower end of sleeve I2. The other end of Verti
showing, by way of example, a preferred em
cally folding arm 32 is fastened to the end of
bodiment of the inventive idea.
`
spring 25. Thus the tension of spring 25€ exerts p
In the drawings:
a constant vertical pull upon arm 32. This pull
Figure 1 shows ‘a scaffold in front elevation
is developed into pressure through the lever
with the brakes in the operative locking posi 45 formed
by the relative position and swinging con
tion;
nections of the link 25 connecting armi 32 to
Figure 2 is similar to Figure 1 and shows the
brake IS and'fastened by pinions 28, 3Q. The
scaffold with the brakes locked in the inoperative
pressure developed in this lever arrangement in*
position;
`
50 creases the pressure of brake I 6 against its verti
Figure 3 illustrates in front elevation the rope
cal post I4, thereby firmly holding the scaffold
supporting means which are used to operate the
in a stationary position. The upper ends of
scaffold;
springs 24, 25 are fastened to the transverse frame
Figure 4 is a side view of the device shown in
element I0. The purpose of these springs is to'
Figure 3;
55 exert pressure on the- brakes I6, Il, as above
2,407,655
3
4
mentioned, through levers and links 32, 26, and
33, 2l.
locked and the scaffold is prevented from> sliding
down the vertical rods I4, I5.
.
It may be noted that spring 24 on the left hand
The self wedging action of brakes I6, I'l is an
side of the drawings (looking in the direction of
important feature of the present invention en
Figure l) blocks brake Il on the right hand side
abling the operator to anchor the scaiiold easily
and safely at any height desired.
This invention' provides safe, eñicient and
of this drawing and that spring 25 on the right
hand side of the drawing blocks brake I6 on the
practical means to enable one person to hoist or
left hand side of this drawing.
The entire mechanism operates simultaneously
lower the novel scaffold herein described with a
and is intended to distribute an equal pressure 10 minimum of efforts and with a maximum ease of
control due to the automatic self wedging brake
on brakes I5, I'I under tension of springs 24, 25
upon arm 32 mounted on pinio-n 34 and arm 33. . actions involved.
It is apparent that when the lever 49 is swung
mounted on pinion 35.
about the pivot 35 from the locking position
The transversal supporting beam or frame ele
ment II has one of its ends fastened to slidingY 15 shown in Figure 1 to the unlocked position shown
in Figure 2, the nose 39 is raised from the bar 50
sleeve I2, while the other end is fastened to
provided that the bar 5U at that time is in the
sleeve I3.
`
Beam II is provided with a pinion 36 upon . position shown in Figure l.
Usually the operator will raise Vor lower the
which fulcrums a lever 3l' carrying a pulley Wheel
38 resting upon the upper edges of folding arms 20 scaffold by pulling at the rope 'I3 while holding
the lever 4S in its open position through the
32, 33 and causing a downward’ swing of 'these
application of hand or foot pressure.
arms. The nose 39 of this lever may rest against
a locking bar 5B fastened to a ratchet wheel 45
In certain instances, however, it is desirable t0
maintain the lever 49 in its o-pen position. The
rotatably mounted on pinion 4I. One end of an
bar 53 which is used for this purpose can be con
arm 42 _pivots on pinion 4I, while its other end
43 is pulled vertically upward byspring 44 fas
veniently swung into its locked position by pulling
tened at point 45 on upper beam or frame I3.
This upward motion displaces a pawl 45 mounted
on pinion 4l on arm 42 and having a sharp point
48 which engages into a tooth of ratchet wheel
at the cord 'Il which is attached to the lever 42
45, thus preventing the counter-clockwise rota
ing the spring 44.
tion of the ratchet wheel 40 (looking in the direc- `
In the coursev of lthis swinging motion the pawl
43 will press against the ratchet wheel 40 and
will rotate this wheel along with the bar 50 which
tion of Figure l). ~
A hand or foot operated release lever 43 has the
form of a hollow frame and is firmly attached
to the lower end voi lever 3l, thus forming a
at 43,
.
’
If the cord ll is pulled it will cause the lever
42 vto swing about the pivot 4i thereby expand
' f
is ñrmly attached thereto. .
As a result of this rotation the bar 52 will be
permanent right angle'with the lever 3l.
moved to position shown in Figure 2 in which the
The ratchet wheel 45 rotates along with the
locking bar 5I] which is firmly connected thereto
.and which has rounded ends 52 'and 52a of this
nose 39.
arm coming intermittently in contact with a con
cave section 38a at lever 3l'.
The scaiïold is hoisted by a block and tackle
end 52 of the bar 54 is in engagement with the
`
As soon as pressure on the cord 'II is released
the spring 44 contracts and will swing the linkV
42 about the pivot 4I Vwhile the pawl 46 will slide
over the teeth of the ratchet 43. A spring (not
shown) may be used to facilitate the insertion of
running from hook’23, shown in Figures 1 and 2,
to hook 53 in Figure 3, fastened by bolts 53a on a 45 the pawl 4B into engagement with an adjacent
beam 54. The beam 54 slides up or down on the
tooth of the ratchet 45.
`
It is apparent that if pressure upon the outer
tion by clamps 55, 56 which are tightened by
end of the lever 43 is released at that time',- the
pressure of the springs 24 and 25 will merely
screw handles 5l, 53.
As shown in Figure 5, each of the clamps 55 50 strengthen the engagement of the nose 39 with
vertical rods I4, I5 and is held in a steady posi
or'55 consists of two semi-circular jaws 59, 5@
the bar 50.
'
fitting closely around rod I5. Jaw Ell is adjusted
In order to release the lever 49 and to cause
the brake shoes I6 and Il to press against the
by turning screw handle 58 and is held in posi
posts I4 and I5 it is merely necessary to move the
tion by two sliding bolts 62 and 53.
The described scaffold is operated as follows: 55 bar 50 out of engagement with the nose 33 in the
manner hereinbefore described.
The brakes are unlocked to allow the hoisting or
It is apparent that the described scaffold pro
the lowering of this scaffold by pushing down
vides a simple and eiîectively operating construc
the upper end 43a of control lever 49. The action
tion by means of which the frame of the scaffold
of the mechanism is as follows: When lever 49
is always maintained in its locked position upon
60
is pushed down along with the lever 3l, the -pulley
the posts so that there is no danger that ac
wheel 38 riding along the upper edges of folding
cidents may be caused as the result of a negligent
arms 32, 33 will describe a downward curved
operation of the scaffold.
motion involving pressure of this wheel upon
It is furtherV apparent that the illustration
arms 32, 33 and causing these latter to fold down 65 shown above has been given solely by way of il
wardly while pulling down link arms 26, 2l' fas
lustration and not by way of limitation and that
tened on brakes I6, I "I, thus'causing these brakes
the described construction is subject to wide
to be displaced away from their points of friction
variations and modifications without exceeding
on vertical rods I4, I5.
the scope or intent of the present invention; all
When control lever 49 is released, springs 24, 70 Vof such variations and modiñcations are to be
25 pull up folding arms 20, 2| and arms 32, 33
included within the scope of the present'inven
to their original position. During this motion
tion.
lever 3l swings downward >around its pinion 35
Y
> What is claimed is:
.
‘
>
1. In a scaffold, in combination with a post, a
the locking bar 50. Then the brakes I6, I'I are 75 sleeve slidable upon said post, a brake adapted
and presses down its concave curved nose 39 on
5
2,407,655
to engage said post, a link having an end pivoted
to said brake, an arm pivoted to said sleeve, said
link having another end pivoted to said arm in
termediate the ends of the arm, a frame element
carried by said sleeve, a spring carried by said
frame element and connected with said arm for
maintaining said brake in engagement with said
6
,
bers having ends pivotally connected to said
brakes and other ends pivoted to said upper
frame, links having ends pivotally connected to
said brakes, two arms extending side by side and>
having opposed ends pivotally connected to sepa
rate sleeves, said links being pivotally connected
to separate arms intermediate the ends of the
post, a lever, and means connected with said lever
arms,
springs having upper ends connected to
and engaging said arm for releasing pressure upon
said
upper
frame element and lower ends con
said brake when said lever is actuated.
li) nected to the other ends of said arms, wherebyl
2. In a scaffold, in combination with a pair of
said brakes are maintained by said springs in en
posts, sleeves slidably mounted upon said posts,
gagement with said posts, a lever swingably
at least one upper frame element extending be
mounted upon said lower frame element, and a
tween said sleeves and ñrmly connected thereto,
roller carried by said lever and engaging said two
at least one lower frame element extending be
arms, said roller depressing said arms to release
tween said sleeves and ñrmly connected thereto,
pressure upon said brakes when said lever is
said sleeves having recesses therein, brakes
swung.
A
adapted to engage said posts in said recesses,
links having ends pivotally connected to said
4. In a scaffold, in combination with a post,
a brake adapted to engage said post, means for
brakes, two arms extending side by side and hav 20 pressing
said brake against said post, a lever con
ing opposed endspivotally connected to separate
nected
with
said means and movable to a releas
sleeves, said links being pivotally connected to
ing position for releasing pressure upon said
separate arms intermediate the ends of the arms,
brake, said lever having a free end, a ratchet
springs having upper ends connected to said
upper frame element and lower ends connected to 25 wheel, a pawl-carrying lever, means supporting
said ratchet wheel and said pawl-carrying lever
the other ends of said arms, whereby said brakes
for rotation, a pawl upon said pawl-carrying lever
are maintained by said Vsprings in engagement
for engagement with said ratchet Wheel to turn
with said posts, a lever swingably mounted upon
the ratchet wheel in one’direction, and a locking
said lower frame element, and a roller carried by
bar
ñrmîy connected to said ratchet wheel and
said lever and engaging said two arms, said roller 30 rotatable
therewith to a position wherein it locks
depressing said arms to release pressure upon said
said releasing lever in its releasing position.
brakes when said lever is swung.
5. In a scaffold, in combination with a post,
3. In a scaffold, in combination with a pair of
a sleeve slidable upon said post, a brake adapted
posts and rope-actuated hoisting means thereon,
to engage said post, a link having an end pivoted
sleeves slidably mounted upon said posts, at least
to said brake, an arm pivoted to said sleeve, said
one upper frame element extending between said`
link having another end pivoted to said arm in
sleeves and ñrmly connected thereto, at least one
termediate the ends of the arm, spring means
lower frame element extending between said
connected to said arm for maintaining said brake
sleeves and Iirmly connected thereto, said sleeves
in
engagement with the post, and leverage means
having recesses therein, brakes adapted to engage 40
in
operative
connection with said arm for releas
said posts in said recesses, a rope-engaging ele
ing pressure upon said brake when said leverage
ment carried by said upper frame element for
means is actuated.
hoisting the scaifold, elongated connecting mem
THOMAS G. DI SANTI.
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