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Патент USA US2131947

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Oct. 4, 1938.
G M, @woRE
Filed Nov. 26, 1.935
Patented Oct. 4, 1938
, ,
Gordon M. Gilmore, Los Angeles', Calif., assignor
to Los Angeles Steel Casting‘Company, Ltd.,
Los Angeles, Calif., a corporation of vCalifornia
Application November 26, 1935, Serial No. 51,612
5 Claims. (CI. 94-48)
This invention relates to tampers’ of the sheep of adjacent tampingv elements, and whereby the
foot type, such as are employed on tamping roll-
replacement of all the feet on a roller may be
ers 'of the character used in compacting the" sur'fa'ceiof the soil'asifor‘ example in road’building 'op-
easily, quickly and economically .eifected and
without the necessity of disturbing weld joints or
5 erati'ons.
Tampers of ‘the vabove type are ordinarily
formed‘ of ‘cast metal in a' single piece and ‘are
af?xe'd'tor the periphery of a cylindrical rollerlby
a weld joint; a series of the‘ tamp'ers being'a'pplied
10 to‘ the ‘roller in circumferential and longitudinal
rows thus stud'din'g‘ithe roller with a multiplicity
'o'f‘the tampin'g elements ‘with the adjacent e‘leme'nts so arranged and having their outer ends so
formed as to leave an unbroken tread mark inTthe
15 surface of the ground being roller tamped. In
' ,
Another object is to Provide a C'OIIStI'IIGtiOII in
a sheep foot tamper whereby the foot portion and
shank portion thereof are separable, and em- 10
bodving a means of connection between the foot
portion and shank involving solely a wedge en
easement between 17118 I001; and ‘Shank thereby
obviating the use of supplemental connecting
elements such as pins, bolts, keys, screw threads, 15
weld joints, and the like, and which construction
or excessively worn, it is necessary to remove the
defective element and replace it‘ with one in prop-
permits 0f the Shank being formed with a soft
metal base that is easily Welded With no risk of
cracking in applying the shank to the roller, and
also permits of the'ifoot being formed‘ of a hard- 20
of‘ a tamping element is a laborious and time con-
ened wear-resistant metal, such as a heat treated
sumi-ng task and accordingly a costly operation,
and furthermore is difficult of accomplishment by
ireason ‘of! the ‘necessity of reforming a replace-
steelgand the wearing tread surface of the sheep
foot tamper being ‘rendered far more resistant to
abrasions than in the ordinary‘ construction now
, “ment tamperelem'ent to conform to the other
'tampers on'the roller which may be considerably
generally employed.
A further object is to provide a 'demountable
'worn'an'd'out of conformity with an" added new
foot for sheep foot tampers together with an as
‘tampe'r. Furthermore it has been the practice'to
sociated shank formed for telescopic engagement
form" the tamper ‘foot with a tamping area of ap30 proximately six square inches'which area is diminished: under wear. When ‘the vseat has worn
away to re'ducethe'tamping areafto approximately
five‘ square inches the tampingfoo-t is considered
"useless, and as a’consequenc'e it becomes neces35 sary ‘when the tempers on a roller have'becom'e
excessively worn to 'either discard the roller
with its-'asse'mblage'of tampers, or to re?t the’roller with 'a'complete assemblage of new tampers,
either of ‘which involve considerable’expense.
,In repairing worn tampers it is ‘necessary to
with ‘the foot, including means embodied in the
joint ‘whereby proper interconnection of the foot 30
on the shank and also proper positioning of the
foot on the shank will be insured, and whereby ad
justment to effect alignment of the foot vportion
on the shank is rendered unnecessary.
With the foregoing‘objects in view together with 35
such other objects and advantages as may subse
quently appear, the invention‘is' carried into effect
as hereinafter fully described, and as illustrated
'by way of example in the accompanying drawing,v
in which:
build up ‘the worn, portion by welding operation
andwhere a'number of the tamper feet'on a roller
are badly worn, it is not acceptable to‘ weld new
Fig. 1 is a view in side elevation of a sheep foot
tamper depicting the manner of assembling the
parts; portions being broken away to show parts in
ones here‘ and there on the ‘roller ‘as such new
45 "tampers would be considerably longer than the
oldon'e's which would-preclude proper tamping ac‘tion of the roller.
rIYhe present invention'is designed to‘ obviate the
objectionable features incident ‘to the ‘ordinary
50 sheep foot ‘campers above pointed‘out, and has
'as its ‘primary ‘object the provision ‘of a construction whereby any one or more of the-feet of
the tamping Iroller may be readily removed and
replaced and whereby a renewed foot of a tamp-
v55 ing "element may be easily conformed to the feet
newal may beeffected in the ?eld with simple
‘event-any of the tamper elements become broken
e'rico‘nditioni, otherwise the el?ciency of the tamp‘:0 'ing roller ‘is impaired. Ordinarily such removal
performing weld operations, and whereby such re
Fig. 2 is a perspective view of the tamper shank; 45
Fig. 3 is a perspective view of the tamper foot;
Fig. 4 is a view in end elevation of a fragmen
vtary portion of a tamping roller showing it as
equipped with the sheep foot tampi'ng ‘elements.
Referring to the drawing more speci?cally, A 50
indicates generally theshank of the sheep foot
tamper'and B designates the-demountable tamper
In carrying out the invention the‘ shank A is
jprmed- ofv ductile cast steel, whereby the tamper s55
shank is rendered subject to being readily mount
ed on the periphery of a cylindrical roller C as
indicated in Fig. 4 by a weld joint, and the foot
element B is formed of heat treated cast steel
Cl whereby the shoe B is rendered resistant to
abrasive wear.
The shank A is formed with an elongated ta
pered body portion 6 of general frusto-conical
form having a taper of low pitch, the shank be
ing here shown as having its outer surface ex
tending at an angle of four degrees relative to
the plane of the axis of the shank. The en
the shank in telescopic engagement therewith as
shown in Fig. l, the foot being driven into tight,
wedge or tapered engagement with the outer
end portion of the shank and being aligned
thereon as before described.
.In event it becomes necessary to remove and
replace any one or more of the tamping feet B
it is only necessary ineffecting removal of a
foot to drive it outwardly longitudinally. of the
shank to free it from the latter, and on thus 10
being removed another foot may be quickly posi
tioned on the shank.
In this fashion all of the
larged end portion of the shankis formed with ' tamping feet on a roller may be readily renewed.
an arcuate ?ange 1 having a concave bearing Furthermore the renewed tamping feet if not
surface 8 formed to conform to the curvature of excessively worn may be reconditioned by build.
the periphery of the cylindrical roller C.' .
ing up the worn portion by the usual welding
The tamping foot B embodies a collar 9 of operation.
general cylindrical contour, the inner periphery
When it becomes necessary to replace a worn
of which is tapered to conform to the» taper of
or broken foot the replacement foot may be
20 the shank; the collar being designed to receive
readily formed to conform with the feet on ad
the outer end of the tapered'shank 6' and ‘to
jacent vshanks so ‘as to. extend on a plane
have wedged frictional engagement therewith. therewith.
'“The tamping foot B further embodies a tread
portion l0 formed integral with the collar 9
1. In a sheep foot tamper, a ductile metallic
25 which tread portion is formed with an arcuate ' shank formed with a base suitable for welding 25
outer face ‘H formed on a curvature which when onto a cylindrical metallic roller, and a'tamping
the tamping foot is mounted on the shank and
the latter a?ixed to the roller C will extend in
the direction of the circumferential length of
30 the cylindrical ‘roller‘ concentric with the axis
of the latter. ~The tread face ll is straight
transversely and terminates ‘at its rear end in
foot formed with a collar‘having detachable tele
scopic wedge engagement with the outerend of
said shank, and means embodied in the tele
scoped interconnection of said shank and foot
for aligning the foot on the shank. '
' ‘
2. A sheep foot tamper comprising a shank
formed of ductile metal and ‘having a tapered
a heel .l2 and at its forward end in a toe M,
which heel and toe portions are rounded in con ' outer end portion of low pitch, and a hardened
tinuation of the tread face of the foot such as metal tamping foot formed with a collar having 5"
to impart to the end faces of the foot a stream
lined contour whereby on rotating. the roller B
the tread will be brought in and out of contact
‘with the surface being contacted with a minimum
of disturbance of the compacted material.
In mounting the tamping feet on the shanks
they are disposed with their heel portions l2
positioned to extend in the direction of rotation
of the roller with the transverse straight faces
45 of the treads thereof extending in the direction
of. the. length’ of the roller.'
- .
It being quite important that‘the foot mem
bers be ‘properlyaligned on the‘ shank and dis
posed with the heel portion thereof forwardmost,
means are provided for insuring application of
thefoot to the shank in proper relative relation
thereto. This means is here shown as embody
ing ‘a straight flat surface l5 formed onthe tip
portion of the shank and extending diagonally
55 from the reduced end of the shank and also em
bodying a correspondingly contoured ?llet l6
formed on the inner periphery of the collar 9
whereby‘ on inserting the reduced ‘end of the
shank into ‘the collar 9 it can only be brought
60 to its'seated position in the latter when‘the flat
face l5"on the shank is brought into parallel
‘relation to the ?at face of the ?llet I6. As here
shown the ‘flat face l5.and ?llet iii are formed
on the forwardmost portions of the shank and
‘foot member; but manifestly maybe disposed
‘at any other tp‘oint around the periphery of the
shank and foot member
In theapplication and operation of the inven
tion the ductile shanks 'A'are affixed to the outer
periphery of the cylindrical rollers C to project
radiallytherefrom, being attached to the roller
by welding the arcuate face 8 tothe circumfer
ential surface of the roller.
After thus a?ixing the shank A to the roller
the tread foot'B is applied to the outer end of
an internal taper to conform to the taper of said
shank, said tamping foot being driven onto said
shank in frictional wedge engagement therewith,
said shank having a diagonally extending ?at
face leading from the reduced end thereof, and 40
said collar being formed with an internal ?llet
having a flat face conforming to the ?at face on
said shank.
3. A sheep foot tamper comprising a shank
formed with a base of ductile metal, and having 45
a tapered outer end portion formed with a flat
face extending diagonally from. the reduced end
'of the'shank, and a hardened tamping foot formed
with a collar having an internal taper conform
ing to the tapered end portion of said shank‘ and
having a ?llet arranged to conform to and en
gage with the ?at face on said shank.
4. In a tamping roller, a metallic cylinder, a
series of sheep foot tampers carried on ‘the pe
riphery of said cylinder each of which embodies
a shank‘formed with a ductile metal base affixed
to the cylinder by a weld joint, said shank having
a tapered outer end portion formed with a flat
face extending diagonally from the reduced end
of the shank, a demountable hardened. metal
tamping‘foot formed with a collar telescopically
carried on the outer end of said shank, said col
lar having an internal taper conforming to and
engaging with the tapered outer end of ‘said
shank, said tamping shoe having an arcuate tread 65
face formed on an arc concentric with the axis
of said roller, and a ?llet in said collar arranged
to engage the ?at face on said shank to align the
foot thereon with its arcuate tread extending in ‘
parallel relation to the circumference of said 70
roller, said foot being held on said shank solely
by frictional engagement therewith and being
adapted to be detached therefrom by driving the
foot outwardly longitudinally of said shank.
5. In a sheep-foot roller tamper. a metallic cy 75
3 '
lindrical roller, a series of tamper shanks, arou
shank on which it is carried, each of said tampers '
ate bases formed on said shanks seating on and‘
being formed with an arcuate tread face termi
nating in curved heel and toe portions, and co
operating means on said shanks and collars for
secured to the outer periphery of said roller, said
shanks having tapered outer ends of low pitch
to each other, a sheep-foot tamper detachably
positioning and maintaining said tampers with
the arcuate tread faces thereof extending in the
carried on each of said shanks formed with a
direction of the circumference of said roller.
and being of complementary dimensions relative
collar having an internal taper conformable to
and frictionally engaging the tapered end of the
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