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Патент USA US3024807

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March 13, 1962
v. |_. FRANTZ
3,024,797
SAND CUT—OFF
Filed Nov. 17, 1958
2 Sheets-Sheet 1
3/
52
5g
30 4/ 52 43
V
49
INVENTOR
V/RG/L L. FRANTZ
BY
HIS ATTORNEY
‘
United States
3,024,797
Patented Mar. 13, 1962
1
3,024,797
Virgil L. Frantz, Saiern, Va, assignor to Graham-White
Sales Corporation, Salem, Va., a corporation of Vir
ginia
SAND CUT-OFF
Filed Nov. 17, 1958, Ser. No. 774,234
14 Claims. (Cl. 137-38)
This invention relates, generally, to sanding systems
2
designed for a ?anged connection or, through a separate
adapter plate, to one ?tted for a union, the sand cut-cit
in either case being so attached as to enable the position
of its blade actuating handle to be adjusted to suit a
particular installation.
Other objects and advantages of the invention will ap
pear hereinafter in the detailed description, be particu
larly pointed out in the appended claims and be illus
trated in the accompanying drawings, in which:
for applying sand for increased traction to rail or other 10
FIGURE 1 is a central vertical sectional view of a
surfaces and, more particularly, to a sand cut-off for
preferred embodiment of the sand cut-off of the present
cutting off flow of sand between a supply hopper and
invention applied to a sand trap of a type to which it is
sand trap of such a system.
attachable by a ?anged connection;
Due to the severe conditions to which it is subjected
FIGURE 2 is a plan view of the sand cut-off of
in service, a sand trap should be removed periodically 15 FIGURE 1; and
for inspection and, if necessary, repair or replacement.
‘FIGURE 3 is an end elevational view of the sand cut
Requiring the ?ow of sand from the supply hopper or
oif of FIGURE 1 applied to a sand trap ?tted for a
sand dome to be shut oif in the interim, such removal
union, portions being broken away and shown in section
has heretofore been rendered di?icult because of the
to more clearly illustrate certain of the details of con
inability of available cut-offs to operate e?iciently over
struction.
protracted periods. Ordinarily, such a cut-off employs,
Referring now in detail to the drawings, in which like
as its cut-01f means, a blade or gate projectible from
reference characters designate like parts, the improved
the side into the path of ?ow of the sand and depends
sand cut-off of the present invention is intended for use
on a wiping action between an edge on its housing and
in a sanding system temporarily to interrupt gravity ?ow
the upper face of the blade to prevent sand from being 25 of sand from a supply hopper. While applicable gen
withdrawn with the blade into a blade compartment at
erally to sanding systems, the sand cuteotf is especially
the side, in which the blade is normally contained.
Herein lies the dii?culty, since it is impossible to main
adapted to be interposed between a supply hopper and
sand trap of a sanding system or sander of a locomo
tain a contact between the edge and the blade sufficient
tive or other railway vehicle to facilitate inspection and
to wipe the latter clean with the result that sand is 30 repair or replacement of the sand trap, or in operations
progressively deposited in the blade compartment, ulti
mately to a point where it interferes with or blocks
requiring removal of the sand trap or parts of the system
beyond the trap.
retraction of the blade.
Designated generally as 1 and designed particularly for
It is the primary object of the present invention to
use in a locomotive sanding system or sander, the pre
provide an improved sand cut-off which, while em 35 ferred embodiment of the sand cut-off of the present in
ploying a retractable blade as its cut-off means, will
vention is installable in a sand supply line (not shown)
operate e?iciently and without clogging for an inde?nite
between a supply hopper or sand dome (not shown)
period.
and a sand inlet or inlet port 2 at the top of a sand
Another object of the invention is to provide a sand
trap 3. The illustrated sand cut-off 1 is attachable
cut-off for a sanding system whereby any sand drawn 40 either directly to the body 4 of the sand trap, in the
with the blade into the blade compartment is automati
manner shown in FIGURE 1, or through suitable means,
such as the adapter plate 5 shown in FIGURE 3, if the
cally dumped'back into the system, thereby ensuring
e?icient operation without the close tolerance between
sand trap is ?tted about its sand inlet for a union. In
the blade and a wiping edge on the housing heretofore
either case, the sand cut-off 1 surmounts the sand trap
deemed essential.
45 3 and is disposed to cut oii flow of sand by gravity
from the supply hopper through the sand inlet 2 to
An additional object of the invention is to provide a
the interior 6 of the sand trap 3.
sand cut-oft’ for a sanding system in which any sand
moved by the blade in either its closing or opening stroke
The illustrated sand cut-off is comprised of a body,
is automatically returned to the system and cannot inter
housing or casing 7 having a main passage, opening or
fere with further operation of the blade.
50 bore ‘d extending substantially vertically therethrough and
A further object of the invention is to provide a sand
connectable at its inlet end 9, as by internal threading it},
cut~o?c for a sanding system, the blade of which, when
to a supply pipe (not shown) from the supply hopper (not
closed, seats against a seat in the housing and in which
shown) and at its outlet end 11 to the sand inlet 2 of the
any sand pushed ahead of the blade during closing is
sand trap 3 in the manner above described. Preferably
received in a recess associated with the seat and auto 55 formed in the body 7 of the sand cut-off 1 and opening
matically returns therefrom after the blade has been re
from a side or substantially radially into the main passage
8 through a transversely, horizontally elongated slot or
tracted, interference by sand with closing of the blade
thus being prevented in both a given and any subsequent
mouth, side opening or inlet 12, is a side compartment or
operation.
chamber 13 in which normally is housed or contained a
Another object of the invention is to provide a sand 60 preferably substantially ?at, horizontally disposed blade
or gate 14 projectible through the mouth 12 substantially
cut-off for a sanding system having a blade closable
against spring pressure by an actuating handle and locked
in closed position by a bayonet-type joint, the joint
radially into the passage 8. The blade-housing compart
ment also opens, through a second, auxiliary or bottom
opening or aperture or outlet 15, onto the lower or outlet
being of such arrangement and construction as to un
lock under service forces and enable the blade to be 65 end 16 of the body 7, the auxiliary opening 15, below
retracted by the associated spring means in case the
blade is accidentally left closed, thereby assuring that in
the mouth 12, preferably being divided or separated from
the lower portion of the passage 8 by a substantially verti
cally extending or disposed septum or partition 17, form
service any sand in an associated supply hopper will
ing a lower extremity or extension of the side wall or
be available for a sanding operation.
side
18 of the passage 8.
Yet another object of the invention is to provide a 70
Of a size to close the passage 8 when fully projected
sand cut-off which may be attached to a sand trap
thereinto through the mouth 12 interrupting the passage’s
3,024,797
3
4
side wall 18, the blade 14, when in closed position, is
like sealing means 34 seated in the plate about the bore, is
the blade’s actuating stem or rod 35 which conveniently
adapted to rest at its front or free end 19 on a ledge, shelf
or lip 20 formed on the side wall 18 opposite and prefer
ably substantially on the level of the lower edge 21 of
the mouth 12. As an aid in guiding the blade 14 in its
reciprocable movement as it is projected into and retracted
from the passage 8, it is preferred that the ledge 20 be
extended ‘or continued along the sides of the side wall 18,
substantially to the sides of the mouth 12 and that ‘the
may be formed integrally with the blade and carries on a
reduced or necked outer end portion 36 an actuating or
operating handle or knob 37. Rotatably mounted on the
stem 35 so as to be rotatable freely relative thereto while
moving axially therewith, the actuating knob carries on
the inner end portion of its stem-encircling shank or hub
38 one or preferably a pair of oppositely disposed, radially
outstanding, conveniently integral lugs or Wings 39 slid
sidewall above the ledge be recessed by a groove or guide
10 able through a notch or notches 40 of corresponding con
Way 22 for receiving the sides 23 of the blade, the latter
?guration and disposition into an outwardly opening
thus riding or sliding on the ledge and the lower edge 21
socket 41 formed in a boss 42 integral with the cover
of the mouth 12 and in closed position having its front end
plate 31. Concentric with and disposed outwardly of the
19 and sides 23 seated in the groove 22 against the ledge
aperture 33 in the cover plate 31, the socket 4-1 is re
and thereby sealing the passage 8.
15 stricted about its outer end by one or, for the preferred
Since, as the blade 14, is projected into the passage 8,
two notches, a pair of radially instanding ?anges 43
its front or leading end 19 will push before it particles of
spaced by the notches, the ?anges and the lugs 39 together
sand, even though, as in the disclosed embodiment, the
forming a bayonet joint or lock for holding or locking the
blade is tapered or bevelled from the top toward front
and sides to a relatively narrow or knife-like edge, such 20 blade 14 in closed position. Limited in movement in a
closing direction by engagement of the confronting inner
particles could interfere with or even block full closure
ends 45 and 46 of the socket 41 and shank 38 of the
of the blade if, at full closure, the blade was designed to
knob, respectively, the blade is limited in the opposite or
have its leading end abut against the confronting face of
opening direction by engagement of a shoulder 47 formed
the side wall 18. To guard against this contingency, the
blade 14, in closed position, has its leading end 19 spaced 25 on its outer end with the confronting inner face 48 of the
cover plate. To ensure that the blade will be held in open
inwardly from the inner end or wall 24 of the confronting
position when the knob 37 is unlocked from the boss 42,
portion of the groove 22 and the latter, over that portion,
there preferably is provided a coil spring or like yieldable
is made of sufficient depth to accommodate any such parti~
means 49 encircling the shank 38 of the knob and inter
cles. Additionally, the upper surface 25 of the ledge 20
posed and acting between the head 5f! of the knob and the
slopes or is inclined downwardly inwardly or toward the
center of the passage 8 at such an oblique angle that any
sand particles remaining in the groove, on retraction of
the blade, will be caused by gravity to slide down the
confronting outer face 51 of the cover plate 31.
Were the lock between the lugs 39 and flanges 43 con
ventional, a workman might well leave the blade locked
blade presents a problem which is solvable in the manner
from its source of supply.
in closed position at the completion of the operation for
surface into the passage, thus clearing the groove for the
which it was closed, thus rendering the sanding system
next closing of the blade.
35
inoperative, when needed, by blocking the sand trap 3
While interference by sand particles with closing of the
above described, a major problem in previous sand cut
offs is to prevent interference with opening of the blade
by sand particles carried on the upper face 26 of the blade
as it is retracted. The upper edge 27 of the mouth 12
Any such happenstance is
avoided in the disclosed embodiment by providing each
of the ?anges 43 with an inner face 52 which, while dis
posed radially of the socket 41, is helically curved so as
to incline or slope axially thereof from. one end of the
?ange toward the other. By sloping both ?anges in the
exerts a wiping action on the upper face 26 of the blade,
same circumferential direction, preferably corresponding
more or less depending on the clearance therebetween,
ly forming the confronting outer faces 53 on the lug 39
but a tolerance sufficient to ensure complete wiping could
not be held even if originally obtainable. As a conse 45 and making the thicker ends of the ?anges and lugs of
such thickness that they will overlap axially in the fully
quence, a sand cut-off depending alone on wiping of the
seated position of the shank in the socket, the knob can
blade to prevent an accumulation of sand in its blade
be turned in but one direction to engage the confronting
housing compartment will operate effectively only for a
faces 52 and 53 of the lugs and ?anges and, when so
short time. Here, as the vertical clearance or spacing
between the upper face 26 of the blade 14 and the upper 50 turned, will be cammed by the inner faces 52 on the
?anges into fully seated position. Conversely, if the
edge 27 of the mouth 12 indicates, the blade is only par
tially wiped as it is retracted and such wiping is only
partly depended on to prevent sand from accumulating
in the side compartment 13. Major dependence is placed
blade accidentally is left locked in closed position, the
shocks or jolts to which the sand cut-off is subjected in
service will cause the blade automatically to be unlocked
on the auxiliary aperture 15 and, if, as here, the com 55 and retracted to open position by enabling the force ex
erted by the spring to cam the lugs 39 on the inner or
partment is partially closed by a bottom wall 28, on
camming faces 52 of the ?anges to the point at which
downsloping or inclining of the portion of the bottom wall
the lugs will register with and release through the
below the blade towards the aperture. With this con
notches 40.
struction, any sand particles not wiped off by the upper
In a sanding system such as here illustrated, in which
or wiping edge 27 of the mouth 12 and carried through 60
the sand cut-off 1 is designed primarily to cut off ?ow of
the mouth on the blade as the latter is retracted, either
sand to an associated sand trap, the sand cut-01f ordi
will be returned by the blade to the passage 8 on its next
narily will be attached to the sand trap, with the mode
projection or, if dropped therefrom into the compartment
13, will automatically be discharged from the compart
ment by sliding along its sloping bottom wall to and
through the auxiliary aperture 15 and so returned to the
main flow of the sand.
To facilitate initial installation of the blade 14, the side
compartment 13 extends outwardly through the side or
side wall 29 of the body 7 and has its outer end 313 nor
mally closed by a cap or cover plate or member 31 re
movably attachable as by bolting to the body, preferably
with a gasket 32 interposed therebetween. Extending
through a central bore or aperture 33 in the cover plate 31
and preferably wiped as it reciprocates by an O-ring or
of attachment dependent upon the type of trap. Thus,
if, as in FIGURE 1, the sand trap 3 with which the
sand cut-off is to be used is ?anged about its sand in
let, the sand cut~o?f may have a connecting ?ange 54 at
its lower end 16 for bolting directly to the body 7 of
the sand trap to provide a ?anged joint or connection
therebetween. If, on the other hand, the sand trap has
an externally threaded neck 55 about its sand inlet 2
for taking a union ?tting, as does the sand trap 3a frag~
mentarily shown in FIGURE 3, the sand cut-off may be
provided with a mating element for such a ?tting. ‘How
75 ever, it is preferred that the same. sand cut-off be usable
3,024,797
5
6
with either type of trap, so as to enable its form to be
standardized.
jecting into and spaced below an upper extremity of said
opening, said blade being projectible through said open
ing for temporarily closing said main aperture, and a
In the disclosed embodiment, the above is accomplished
not only by providing the lower end 16 of the body 7 of
shelf instanding from a side of said main aperture and
the sand cut-o?? 1 with the integral connecting ?ange 54,
having an inwardly and downwardly sloping upper sur
but also by forming in that end within the ?ange 54 an
face disposed to underlie and seat a free end of said
annular bevelled seat 56 encircling or including the out
blade in the closed position thereof.
lets of both the main and the auxiliary apertures 11 and
4. A sand cut-off for a sanding system, comprising a
15, respectively. Adapted to seat the conventional
body having a main aperture extending therethrough, a
crowned upper end 57 of the externally threaded neck
compartment in said body at a side of and having an
55 of the sand trap 3a, the sand cut-off is made con 10 opening onto said main aperture, an auxiliary aperture
nectable to such a sand trap by an adapter plate 5 bolt
separated from said main aperture and. connecting said
able to the connecting ?ange 54 and having an internal
compartment to an outlet end of said body, a cut-off
ly threaded axial bore 58 for threadedly receiving the
blade normally contained in said compartment and pro
externally threaded neck 55, the adapter plate desirably
jecting into and spaced below an upper extremity of said
being of such thickness relative to the threading on the 15 opening, said blade being projectible through said open
neck as to enable the crowned end 57 of the latter to
ing for temporarily closing said main aperture, and a
be drawn tight against the seat 56 before the plate it
shelf instanding from a side of said main aperture and
self engages the lower or bottom end 16 of the body 7
having an inwardly and downwardly sloping upper sur
of the cut-off. The sand cut-off being relatively turnable
face disposed to underlie and seat a free end of said
or rotatable for attachment in any of a plurality of an
blade in the closed position thereof, said side wall above
gularly related positions to the adapter plate 5, it is thus
said shelf being recessed beyond said front end in said
possible to install the sand cut-01f in the position in
closed position for receiving any sand particles pushed
which its actuating knob 37 is most readily accessible
in front of said blade during closing thereof and pre
without disturbing either the position of the sand trap
venting interference thereby with said closing, said par
or the connection between the latter and the sand cut 25 ticles on subsequent retraction of said blade sliding down
off. Such adjustment is equally obtainable when the
said shelf into said main aperture, and a forwardly and
sand cut-off and sand trap are connected by a ?anged
downwardly tapered leading edge on said blade for forc~
joint, as in FIGURE 1, the possible variations in the
ing said blade downwardly against said shelf on move
relative position of the sand cut-off in either case, of
ment thereof through sand to projected position.
course, depending on the number of alignable bolt holes 30
5. A sand cut-off for a sanding system, comprising a
59 in the elements bolted together.
body, a substantially vertically directed passage extend
From the above detailed description, it will be appar
ing through said body, a shelf instanding from a side of
ent that there has been provided an improved sand cut
oif for a sanding system which will operate e?iciently
and without clogging for an inde?nite period. It should
be understood that the described and disclosed embodi
ment is merely exemplary of the invention and that all
said passage, a compartment in said body and having a
side opening onto said passage and a downward open
ing onto a lower end of said body, and a blade normally
housed in said compartment and projecting into and
spaced below an upper extremity of said side opening,
modi?cations are intended to be included which do not
said blade being projectible through said side opening
depart from either the spirit of the invention or the scope
into said passage and in projected position overlying and
40 being engageable with said shelf for closing said passage.
of the appended claims.
Having described my invention, I claim:
6. A sand cut-01f for a sanding system, comprising a
1. A sand cut-ohc for a sanding system, comprising a
body, a substantially vertically directed passage extending
body having a main aperture extending therethrough, a
through said body, a shelf instanding from a side wall
of said passage, 21 compartment in said body and having
shelf on a side wall of said main aperture, 9. 'tompart
ment in said body at a side of and having an opening 45 a side opening onto said passage and a downward open
ing onto a lower end of said body, a blade normally
onto said main aperture, an auxiliary aperture separated
from said main aperture and connecting said compart
housed in said compartment and projecting into and
spaced below an upper extremity of said side opening,
ment to an outlet end of said body, and a cut-off blade
normally contained in said compartment and projecting
said blade being projectible through said side opening
into and spaced below an upper extremity of said open~ 50 into said passage and in projected position overlying and
ing, said blade being projectible through said opening in
being engageable with said shelf for closing said passage,
to said main aperture and in projected position overlying
and being engageable with said shelf for temporarily
closing said main aperture.
actuating means connected to said blade and extending
for actuation through a side of said body, and yieldable
means acting between said actuatng means and body for
2. A sand cut-off for a sanding system, comprising a
normally holding said blade in said compartment.
body having a main aperture extending therethrough, a
7. A sand cut-off for a sanding system, comprising a
body, a substantially vertically directed passage extend
ing through said body, a shelf instanding from a side
wall of said passage, a compartment in said body and
shelf instanding from a side wall of said main aperture,
a compartment in said body at a side of and having an
opening onto said main aperture substantially on a level
of said shelf, an auxiliary aperture separated from said
main aperture and connecting said compartment to an
outlet end of said body, and a cut-off blade normally
contained in said compartment and projecting into and
spaced below an upper extremity of said opening, said
blade being projectible through said opening into said
main aperture and in projected position overlying and
being engageable with said shelf for temporarily closing
said main aperture.
3. A sand cut-off for a sanding system, comprising a
having a side opening onto said passage and a down
ward opening onto a lower end of said body, and a blade
normally housed in said compartment and projecting in
to and spaced below an upper extremity of said opening,
65
said blade being projectible through said side opening
into said passage and in projected position overlying and
being engageable with said shelf for closing said passage,
said upper extremity of said side opening being disposed
to wipe sand from said blade during retraction ‘thereof
into said compartment.
body having a main aperture extending therethrough, a
8. A sand cut-off for a sanding system, comprising a
compartment in said body at a side of and having an
‘body, a substantially vertically directed passage extend
ing through said body, a shelf instanding from a side
opening onto said main aperture, an auxiliary aperture
separated from said main aperture and connecting said
wall of said passage, a compartment in said body and
having a side opening onto said passage, and a blade
blade normally contained in said compartment and pro 75 normally housed in said compartment and normally ex~
compartment to an outlet end of said body, a cut-01f
3,024,797
7
tending into and spaced from vertical extremities of said
side opening, said blade being projectible through said
side opening into said passage and in projected position
overlying and being engageable with said shelf for clos
ing said passage, said compartment having an opening
onto a lower end of said body, and a ?oor in said com
partment below said blade and sloping downwardly to
ward said last-named opening.
8
through said side opening for closing said passage,_ a
cover plate releasably attached to said body and closing
an outer end of said compartment, an actuating stem
rigid with said blade and extending through said cover
plate, an operating knob carried by said actuating stem
outwardly of said cover plate and connected for axial
movement with and rotation relative to said stem, spring
means acting between said cover plate and knob vfor
normally holding said blade in retracted position in said
9. A sand cut-01f for a sanding system, comprising a
body, a substantially vertically directed passage extend 10 compartment, a socket in said cover plate and facing to
ward said knob, instanding ?ange means restricting an
ing through said body, a compartment in said body and
having a side opening onto said passage and a downward
opening onto a lower end of said body, a seat in said
outer end of said socket, a shank on said knob and
seatable in said socket on closing of said blade, and
lug means outstanding from said shank and disposed to
body about said passage and having an inwardly and
downwardly inclined portion confronting said side open 15 engage an inner face of said ?ange means on relative
inward axial movement and rotation of said knob for
ing, and a blade normally housed in said compartment
locking said blade in closed position, said inner face
and projecting into and spaced below‘ an upper extremity
being outwardly inclined for enabling said spring means
of said side opening, said blade being projectible through
under service shocks automatically to cam said lug
said opening into said passage, said blade in projected
means free of said ?ange means and retract said blade
position overlying and being urgable by pressure of sand
into said compartment if accidentally left closed.
therebove downwardly against said seat ‘for closing said
13. A sand cut-off for a sanding system, comprising
opening.
10. A sand cut-oft" for a sanding system, comprising
a body, a substantially vertically ‘directed passage ex
tending through said body, a shelf instanding from a
tending through said body, a shelf instanding from a side 25 side of said passage, 21 compartment in said body and
having a side opening onto said passage and a down
wall of said passage, a compartment in said body and
ward opening onto a lower end of said body, a blade
having a side opening onto said passage substantially
a body, a substantially vertically directed passage ex
on a level of said shelf and a downward opening onto
normally housed in said compartment and projecting
a lower end of said body, a blade normally housed in
into and spaced below an upper extremity of said side
gageable with said shelf for closing said passage, actuat
end of said body, a seat in said lower end and encircling
said compartment and projecting into and spaced below 30 opening, said blade being projectible through said side
opening into said passage, said blade in projected position
an upper extremity of said side ‘opening, said blade being
ovenlying and being engageable with said shelf for clos
projectible through said side opening into said passage,
ing said passage, an integral connecting ?ange at a lower
said blade in projected position overlying and being en‘
ing means connected to said blade and extending for 35 outlets thereonto of said passage and compartment for
actuation through a side of said body, yieldable means
acting between said actuating means and body for nor
mally holding ‘said blade in said compartment, and
means carried by said actuating means outwardly of said
body and engageable with means carried by said body
for locking said blade in closed position.
11. A sand cut-off for a sanding system, comprising
a body, a substantially vertically directed passage ex
seating an end of an externally threaded neck on an as
sociated sand trap, and an adapter plate boltable in a plu
rality of angularly related positions to said ?ange, said
adapter plate having an internally threaded axial bore
for threadedly receiving said neck.
14. A sand cut-off for a sanding system, comprising
a body, a substantially vertically directed passage ex
tending through said body, a shelf instanding ‘from a
tending through said body, a compartment in said body
side of said passage, a compartment in said body and
and having a side opening onto said passage and a down
ward opening onto a lower end of said body, a blade
having a side opening onto said passage and a down
ward opening onto a lower end of said body, a blade
normally housed in said compartment and projecting in
to and spaced below an upper extremity of said side
opening, said blade being projectible through said side
opening to close said passage, an actuating stern attached
to ‘an outer end of said blade and projecting through a
normally housed in said compartment and projecting
into and spaced below an upper extremity of said side
opening, said blade being projectible through said side
opening into said passage, said blade in projected posi
tion ovenlying and being engageable with said shelf for
side of said body, an operating knob rotatably mounted
closing said passage, means on said body for connecting
on an outer end of said stem and connected for axial
a sand inlet to an inlet end of said passage, an integral
connecting ?ange at a lower end of said body, a seat
movement therewith, spring means acting between said
knob and body for normally holding said blade in said 55 in said lower end and encircling outlets thereonto of
compartment, lug means outstanding from a hub of said
knob, ?ange means carried by said body outwardly of
said passage and compartment for seating an end ofnan
externally threaded neck on an associated sand trap, and
an adapter plate boltable in a plurality of angularly re
said compartment and instanding toward said stem, a
lated positions to said ?ange, said adapter plate having
camming face on said ?ange means and facing inwardly
toward said compartment, said camming face being en 60 an internally threaded axial bore for threadedly receiv
ing said neck.
gageable by said lug means on inward axial movement
and rotation of said knob for locking said blade in
References Cited in the ?le of this patent
closed position, and said camming face being operative
under service shocks for enabling said spring means
UNITED STATES PATENTS
automatically to retract said blade to open position if 65
201,857
Winsor ____________ __ Mar. 26, 1878'
accidentally left closed.
said body, a blade normally housed in said compartment
and projecting into and spaced below an upper ex
2,238,296
2,421,977
Bohannon __________ __ June 24,
Orbin _______________ __ Nov. 17,
Metzger ____________ __ June 6,
Vollmann ____________ __ Mar. 5,
Chesson _____________ __ Feb. 12,
Siebs ______________ __ June 17,
Stock _______________ __ Apr. 15,
Allen ______________ __ June 10‘,
tremity of said side opening, said blade being projectible 75
2,555,129
Hagerbaumer ________ __ May 29, 1951
12. A sand cut-off for a sanding system, comprising
a body, a substantially vertically directed passage ex
tending through said body, a compartment in and ex
tending through a side of said body, said compartment 70
having a side opening which opens inwardly onto said
passage and a downward opening onto a lower end of
1,065,659
1,117,894
1,186,325
1,258,166
1,701,971
1,764,991
1913
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