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Патент USA US3067667

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Dec. 11, 1962
Filed June 21, 1957
3 Sheets—Sheet 2
> Dgc-u 11, 1962
Filed June 21, 1957
3 Sheets-Sheet 3
Unite 5
Patented Dec. 11, 1962
tamping and guide mechanisms which can be of any suit
able length.
A further object of my invention is to provide a mobile
tamper which is adapted to tamp at all places around an
Mobile tampers of the prior art can only tamp effec
tively where the ground is level. It is therefore an object
This invention relates to earth .tamping and it is‘ an
of my invention to provide a tamper which, through the
object of the invention to provide an earth tamper particu
use of a long boom, makes possible tamping in almost any
larly adapted for use on a mobile crane.
Heretofore the tamping of the earth in the bottom 10 situation, even though the ground he so uneven that the
crane itself cannot enter.
of ditches has been done almost entirely by air hammers,
Certain mobile tampers of the prior art are suitable only
each held in the hand of an operator. To a limited ex—
Kenneth R. Wiehhorst, 38492 S. 70th St., Omaha,Nebr.
Filed June 21, 1957, Set‘. No. 667,082
3 Claims. (Cl. 94-—49)
for use in tamping an excavation in a roadway and tamp
tent hydraulically operated mobile tamping machines
ing strokes would be thrown entirely out of alignment if
have been used. However hydraulic tamping machines
have had the disadvantage that the vehicle part thereof 15 the machine were used to tamp the type of a ditch having
cannot be driven su?iciently close to a wall so as to tamp
close to the wall where tamping is vitally needed.
A particular object is to provide a tamping machine
having a guide portion which is suspended from the *boom
excavated earth piled up around it which would be under
the wheels of the machine throwing the tamping stroke
out of desired positions.
Machines of the prior art which are called “hydro
20 hammers” and which are used in some types of tamping,
are unable to straddle a Wide ditch, and so, being limited
tically slidable in the guide portion, the ‘hammer also
of a crane and further having a tamping hammer ver
being suspended from the crane independently of the
guide portion and in which the guide portion has a ?at
by the straddle principle, are unsuitable for tamping wide
ditches. It is therefore an object of my invention to pro
vide a tamper which will work in wide ditches, and such
side which can slide along the relatively ?at side of a
ditch to guide the hammer from one tamping position 25 that if the ditch is so wide that the new machine cannot
tamp from twosides, then the machine itself can go down
to a new tamping position, the ?at side also serving to
the center of the ditch.
guide the hammer as it slides along the side of a wall
A particular object of the invention is to provide a tam
of a building, thus being distinguished from ‘pile-driver
per which is adapted to be used on any type of crane,
guide housings which latter are cylindrical and without
whereby in the use of my tamper assembly it is unnec
a ?at side.
essary for a contractor already having cranes to make
A further object is to provide a tamper the hammer
extra investment in a tamping vehicle.
portion of which is rectangular for tamping a rectangu~
A further object of the invention is to provide a tamp
lar pattern on the earth whereby successive tampings
ing assembly, the tamping force of which can be easily
need not overlap, or can overlap very little, in order to
gain a completion of tamping. This cannot be done with 35 varied and controlled as needed, so as, for example, not
to break sewer tile or the like in the bottom of the ditch
a cylindrical pile-driver hammer because a circle makes
complete tamping practically impossible. When one cir
being tamped.
cle tamped is overlapped with another circular area
tamped, there is always a somewhat triangular space
An object of my invention is to provide a tamping as
in a pattern almost completely overlapping makes waste
the hammer to a selected impacting position without dan
ger of the hammer swinging in a fashion such that it might
sembly, the tamping stroke of which is easily directed
between that remains untamped. Placing tamped circles 40 through the use of a guide portion which effectively guides
of tamping strokes and great inei?ciency.
Comparison with a pile-driver is made here only be
cause it is the only similar machine in existence. Pile
ram and break a wall or cave in the banks of a ditch.
I am aware of the C. N. Friz patent, No. 1,650,827, is
drivers have never been used for tamping to my knowl 45 sued November 29, 1927, titled “Method of Compacting
Earth,” in which a rectangular hammer is carried in a
edge and there is a second reason why pile-drivers could
guide. However, as the guide is not suspended, this diifers
never be effectively used for tamping. This second reason
is that a pile-driver housing is normally completely closed,
a completely closed cylinder. In~my experiments I have
from my concept. Also, as the Friz guide is not used
below the ground as are certain Friz earth segregating
found that a completely closed housing will not work for 50 open-sided boxes, the concept of the low ground use of a
guide such as is my invention is not present in Friz.
tamping. In tamping, dirt is brought up with the ham
My concept is that the guide be free to shift and not be
mer and a closed housing becomes clogged. It is, there
attached to anything below ground as the Friz guide 22
fore, an object of my invention to provide my discovery of
of FIGURE 2 is so attached to his earth-segregating open
the concept of an open housing making a self-cleaning
sided box 17.
A further objective is to provide a tamping machine
A further object of the invention is to provide a tamper
which is very easily controlled whereby it is possible for
with a rectangular guide housing and a rectangular ham
it to eifectively tamp a ditch of any width becaues of the
mer whereby the housing has sides of two different sizes
as is of advantage as the narrow dimension can‘be used 60 control the operator has regardless of whether or not the
ditch be of a width far greater than the width of the guide
for tamping a narrow ditch and the longer dimension
can be used for tamping a wider ditch.
A particular object is to provide a tamping machine
that is adapted to tamp along a building wall, along the
square corners of a building, in trenches, and along a con
crete wall.
A further disadvantage in the use of such tampers is
that they are only adapted to tamp to a certain limited
portion of the tamper.
A further object is to provide an earth tamping assem
bly having a plurality of interchangeable hammers, each
having heads designed for purposes such as demolition
work wherein the assembly may be used in breaking con
crete, cutting asphalt and other pavement, cutting trenches
in pavement or roads, crushing rock and tamping each ?ll.
Other'and further objects and advantages of the present
It is also an object of my invention to provide a tamp 70 invention will be apparent from the following detailed
ing machine which can tamp to any depth desired without
description, drawings and claims, the scope of the inven
tion not ‘being limited to the drawings themselves as the
limit, through the provision of'suspension cables for the
drawings are only for the purpose of illustrating a way
in which the principles of this invention can be applied.
Other embodiments of the invention utilizing the same
or equivalent principles may be used and structural
changes may be made as desired by those skilled in the
art without departing from the present invention and the
gusset plates 26, a pair at each corner, being welded or
otherwise suitably ?xed to the ?ange of a respective corner
purview of the appended claims.
In the drawings:
The edges ‘of the top plate 28 are ?ush with the side sur
post 20 and adjacent upper edge of the respective side
plates 22 or 24.
A ?at plate closes the upper end of the guide 12 and
will hereinafter be referred to as the top or top plate 28.
faces of the upper ones of the side plates 22 and 24 and
FIGURE 1 is a perspective view of the earth tamper
is welded in place, thus forming a full cap at the top of
of this invention shown attached to a portable crane in 10 the guide 12.
operating position;
Referring to FIGURE 6 it will be seen that in top plan
FIGURE 2 is an elevational view of the device as it
view the guide, as mentioned, is of rectangular shape and
would appear in position for tamping earth ?ll in a trench;
therefore the top plate 28 shall be hereinafter referred
the trench being shown in cross section;
to as having a length and width for simplicity of de
FIGURE 3 is an elevational view of the device as it
would appear in position for tamping earth ?ll adjacent
a foundation wall, building wall or the like;
across the width of the top plate 28 from one side to the
FIGURE 4 is an isometric View of the tamper or ham
mer portion of the device;
FIGURE 5 is an enlarged elevational view of the de
vice constituting this invention, some parts broken away
other at a point midway between its ends. Two pair of
triangularly shaped gussets 32 are disposed on either side
of the ?ange 30 near the ends thereof; being preferably
welded to the sides of the ?ange 30 and the upper surface
for convenience of illustration;
of the top plate 28 respectively.
An aperture or eye 34 is provided extending through
FIGURE 6 is an enlarged top plan view of the device
shown in FIGURE 5;
An upwardly projecting rib or ?ange 311 is disposed
the ?ange 30 at a point centered between its ends. In
FIGURE 7 is an enlarged horizontal cross sectional 25 practice, my guide 12 is secured to a suitable carrier. In
view taken along the line 7—7 of FIGURE 5;
accordance with my conception the guide 12 is attached
FIGURE 8 is a fragmentary longitudinal cross section
taken along the line 8——8 of FIGURE 5 ;
FIGURE 9 is a fragmentary elevational view of a
modi?ed hammer having a transversely disposed vertical
cutting blade secured to the bottom thereof;
FIGURE 10 is a fragmentary side elevational view of
to a mobile crane, generally indicated by the numeral 40
and more particularly is suspended from the upper end
of the boom 42 thereof by means of a ?exible lift cable
44. The free end of the cable 44- is inserted through the
eye 34. The cable end may then be secured to the stand
ing part as shown at 46, or in any other conventional
the modi?ed hammer of FIGURE 9 showing an end
elevation of the cutting blade; and
The cable 44 is run over a sheave 48 mounted at the
FIGURE 11 is a perspective view of a further modi?ed
upper end of the boom 42 and then extends downwardly
hammer; such modi?ed hammer having a rounded rock
on the rearward side of the boom 42 and is secured to
‘breaking head portion positioned at the lower end thereof.
suitable mechanism for raising or lowering the guide 12
Referring now to the drawings in detail, like reference
located within the crane 40 and controllable by the oper
numerals refer to like parts through out the several views.
ator from his position in the cab 50 of the crane 40.
The numeral 11} designates the earth tamper of my in 40
The hammer 14, as illustrated, is of a length approxi
vention in its entirety which generally comprises a guide
mately one-third of the total length of the guide 12 and
12 associated with a movable hammer 14 axially disposed
is of box-like open-frame construction similar to the
therein; the guide 12 serving to maintain directional move
guide 12. The hammer 14 is adapted for slidable move
ment of the hammer 14 throughout its length of travel.
ment within the guide 12. The hammer assembly com
The guide 12 is of an elongated, open frame-work con
prises four elongated angle iron corner posts 52 having
struction being rectangularly shaped as seen in top plan
interconnecting spaced apart transversely disposed side
view. Four elongated angle iron members form upright
plates, a ?rst set 54 and 56 being secured at the upper
corner posts 21} of the guide 12, the ‘angle facing inwardly.
end of the hammer assembly and a second set 58 and 66
The four corner posts 20 are arranged in spaced apart
secured to the corner posts ‘52 at points a substantial
parallelism and secured together by a plurality of trans 50 distance therebelow.
versely disposed side plates 22 and 24. The side plates
The lower end of the hammer 14 is provided with a
22 and 24 are of elongated rectangular shape being posi
weight box, generally indicated by numeral 62, formed
tioned one at the upper end, one at the lower end and a
of side walls 64 and 66 which are similarly arranged and
pair disposed in spaced apart relation therebetween. The
secured in comparison to the side plates 54~6tl but have
plates 22 and 24- have their ends suitably secured, prefer 55 a greater width.
ably by welding, to the outwardly facing surfaces of the
The lower end of the hammer assembly or Weight
?ange of the angle iron corner posts 20.
It will be seen that the plates 22 on opposing sides of
the guide 12 are of greater length than the opposed side
cage is covered or closed by an impact plate 68 which
is suitably secured to the ends of the corner posts 52
and lower edges of the weight box side walls 64 and
plates 24 whereby the guide 12 is of oblong rectangular 60 66 thus forming the bottom wall of the weight box 62.
shape in top plan view for reasons which will be explained
The side plates and weight box side walls are of such
As thus described it will be seen, with reference to
FIGURE 1, that the side plates 22 and 24, being aligned
length with respect to the corner posts 52 thereof to
provide a rectangular shape in top plan view comple
mental to the inner dimensions of the guide 12.
and joined at their ends in construction appear as con 65
With reference to FIGURE 4, it will be seen that the
tinuous bands extending about the corner posts 20 in
ends of the Weight box side walls 64 and 66 and the side
spaced relation ‘longitudinally of the guide and serve not
plates 54-60 are joined and secured to the corner posts
only to tie in the corner posts 20 but also serve as tor
52 within the angle thereof. As thus described, it will
sional bracing for the guide 12. Although I show four
be seen that the outer surfaces of the corner post ?anges
side plates to a side of the guide 12 it will be understood 70 are free from obstruction whereby, in assembly, they are
that any desirable number of plates may be employed
disposed in close relationship ‘with the inner surfaces of
dependent upon the overall size and length of guide
The lower end of the guide 12 is open and to further
the angle of the ‘corner posts 20 of the guide 12. As thus
described, the guide corner posts 20 act as trackways for
the coner posts 52 of the hammer assembly 14 which
provide rigidity and strength, I employ triangularly shaped 75 may be likened to track followers.
Returning now to the hammer construction, an elon
gated plate 70 is axially disposed within the hammer as
sembly having its lower end secured to the upper surface
latter is secured to the flange 30 by means of a cap
screw 110.
The outer ends of the shafts 102 are each provided
of the impact plate 68 and suitably braced by short lengths
with grease ?ttings 112 for permitting lubrication of the
of angle iron 72 extending transversely of the lower end.
The angle iron braces 72 are secured to a side surface of
the lower end of the-plate 7G and the upper surface of the
rollers 100.
A like arrangement of rollers 114 are disposed on the
impact plate 68 respectively.
The vertically disposed plate 70 extends upwardly and
underside of the top plate 23‘ adjacent the cable opening
92; being journaled about shafts 11S‘ supported in spaced
apart downwardly extending shaft support flanges 120
its upper end terminates a substantial distance beyond 10 attached to the under surface of the plate 23. The shafts
118 are provided with a lock key 122 at one end which
the upper edge of any one of the side plates 58 or-?tl
secured to the respective support ?ange 120‘ by a cap
as best seen in side elevation in FIGURE 5.
screw 124. The opposite end of the shafts \118 are pro
Bracing struts 74 and 76 are provided at the upper end
vided with grease ?ttings 126 for lubrication of the
of the plate '76 and comprise a pair of struts 74 disposed
rollers 114.
transversely of the plate 70 one on either side of the
With reference to FIGURES 6 and 7, it will be seen
upper end thereof and which are secured to the plate side
that the rollers 114 on the under side of the top [plate 28
surfaces. The ends of the struts 74 are preferably welded
are arranged at right angles to the axis of the rollers 1110
to the inner surfaces of the respective opposed side
on the upper surface of the top plate 28. Fur
plates 58.
ther, that the innermost side surface of each roller over
Further struts 76 are disposed at right angles to the
laps the respective side edge of the cable opening 92 'a
struts 74 having their inner ends secured to the outer sur
substantial distance. As thus described, it ‘Will be seen
face of the respective strut 74 and their outer ends se
that the rollers 16% and 114 being arranged at right
cured to the inner surface of the respective opposed side
angles to each other and overlapping the side edge of
plate 69.
The weight box 62 is ?lled with concrete '78 after which 25 the cable ‘opening 92 guard against ‘any bending or bind
ing of the cable 91) around a sharp edge. The rollers 100
the open top is closed by a pair of ?at closure plates 80
and 114 further prevent excessive Wear of the cable 90
and 32 which abut the upstanding plate 70 at their inner
which would result if the cable 911 were allowed to kink
edges; their outer edges being flush with the side walls 64
and chafe against the edges of the opening 92 during
and 66. The closure plates 80 and 82 are suitably secured
hoisting and release of the hammers 14.
preferably by welding.
Means are provided for limiting the upward travel of
A plurality of triangular gusset plates 84 are provided
the hammer within the guide comprising stops 131} which
through the central portion of the hammer assembly, a
are disposed at the uppermost end of each of the guide
pair being disposed secured on either side edge of each
corner posts 20, as best seen in FIGURES 7 and 8. More
corner post 52 and the respective upper edge of the side
plates 58 and 60. The gussets 84 add to the strength and 35 particularly the stops are L shaped in elevation being
?tted within the angle of the corner posts 20 and welded
torsional rigidity of the hammer assembly 14.
As best seen in FIGURES 1 and 5 the hammer 14 is
shown in operative position within the guide 12 and par
ticularly in FTGURE 5 the close slidable relation of the
corner posts 52 of the hammer assembly 14 within the
angle of the corner posts 20 of the guide 12 may be seen.
The crane 40 has a further cable 90 the free end of
which extends downwardly through a cable opening 92
provided in the top plate 28 adjacent a side of the flange
30 and is then inserted through an aperture ‘or eye 94
The normally horizontally disposed base leg of the stop
is disposed a substantial distanw below the under sur
face of the plate 28 and provides a bumper 132 which
is abutted by the uppermost ends of the corner posts 52
of the hammer assembly 14 should the operator hoist
the hammer beyond reasonable upper limits. The stops
further guard against the hammer making direct contact
with the top plate 28 and prevents excessive bending of
the hammer lift cable 9% when the hammer 14 is hoisted
extending through the upper end of the plate 70 of the
hammer assembly ‘at a point intermediate of its width.
The cable end may then be secured to the standing part
to its uppermost position.
as shown at 96, or in any other conventional manner.
The cable 90 is run over a second sheave 98 mounted in
surface of the top plate 28.
the upper end of the boom 42 which is laterally spaced
from and in alignment with the sheave 48. The cable 91}
then extends downwardly on the rearward side of the
boom 42 to connect with suitable mechanism on the crane
49‘ for hoisting the hammer 14 to an elevated position
within the guide 12 and for releasing the cable 9% permit
ting the hammer to ‘fall freely under the influence of
Referring to FIGURE 6, I further provide a/pair of
rollers 1% disposed in spaced apart parallel positions
longitudinally and rotatably secured to the top plate 28,
one on each side of the cable opening 92.
The rollers 1d!) are journaled about and freely rotate
upon shafts 102 which have their inner ends extending
through suitable apertures in the ?ange 3t} and their outer
ends supported in an upwardly extending shaft support
or spacer flange 1%. The shaft support ?ange 104 is
suitably secured to the upper surface of the top plate
2% in parallelism with the ?ange 39 whereby the rollers
The guide 12 is further provided with tag line attach
ment members 134 disposed at each corner of the upper
The tag line attachment members 134 are L shaped
in side elevation having a normally horizontally disposed
base leg 136 and an upwardly extending ear portion 138
which latter has an aperture or eye 141} therein. As best
seen in FTGURE 6 the members 134 are diagonally dis
posed across each corner of the top plate 28.
The crane as is further equipped with suitable mecha
nism, generally indicated by the numeral 142, for play
ing out and automatically reeling in slack on a tag line
144. The tag line 1314 has one end thereof secured to
and wound about a drum of the mechanism. The free
end of the tag line 14544 is inserted through the eye 1%
of a selected one of the members 134, the line or cable
end being secured by suitable means such as shown at
148, or in any other suitable manner.
With reference to FTGURE 1, it will be seen that the
tag line mechanism 142 is mounted on the boom 42, a
substantially distance below the free end thereof.
tag line 144 serves to maintain the guide 12 in proper
operating position with respect to the position of vthe
100 are con?ned between the flange 30 at one end and the
crane 4d and the area being tampered.
support ?ange 104 at the opposite end.
The tag line 14-d- prevents rotation of the suspended
guide 12 to guard against twisting and cha?ng of the lift
The inner ends of the shafts 162 extend a substantial
cables 44 ‘and 90.
distance beyond the respective side surface of the ?ange
3d and are maintained in position by a lock key 108 which 75 In operation, the boom 42 is swung'into-position to
bring the tamping assembly directly over the area to be
tamped where the guide 12 may be lowered so that its
lower end is in contact with the ground yet leaving suf
?cient tension on the cable 44- to maintain the guide 12
in an upright position. The operator then actuates the
mechanism for winding up the hammer lift cable 90 to
raise the hammer 14 to its uppermost position within the
guide whereupon the cable 91) is released and the hammer
substituted for the weight box 62 and impact plate 68.
The rock breaking head 168 has a rounded face 170 and
would be useful in reducing large rock to movable size,
crushing rock for leveling and demolishing pavement to
be removed and the like.
The operation of the device employing these modi?ed
hammers is substantially the same as the operation of the
earth tamping assembly above described.
The earth ?ll therebelow is compacted '
From the foregoing description it is thought to be ob
by the weight of the hammer 14.
10 vious that an earth tamper constructed in accordance with
drops forcibly.
Successive movement of the boom 42 and actuation of
the hammer 14 progressively tainps the desired area. It
will be seen that the guide 12 prevents lateral displace
ment of the hammer impact and when the hammer is in
its lowermost position substantially all of its length re
mains within the guide to maintain substantially uniform
strength throughout the length of the guide 12 against
lateral thrust.
FIGURE 1 illustrates the invention in operative posi
tion when tamping an area substantially at ground level.
However, my invention is of a particular design most ad
vantageous in tamping back-?ll in trenches, as shown in
FIGURE 2, and in operation closely adjacent a building
wall or the like, as illustrated in FIGURE 3.
my invention is particularly Well adapted for use, by
reason of the convenience and facility with which it may
be assemble-d and operated, and it will also be obvious
that my invention is susceptible of some change and
modi?cation without departing from the principles and
spirit thereof, and for this reason I do not wish to be
understood as ‘limiting myself to the precise arrangement
and formation of the several parts herein shown in car
rying out my invention in practice, except as claimed.
I claim:
1. In a tamping machine, the combination which com
prises an elongated vertically disposed guide frame in
cluding angle iron corner posts connected by transversely
disposed side plates providing a track and having a ?ange
Referring to FIGURE 2, the tamping assembly is shown
extended from the upper end for attaching a cable to said
in operation in a trench 150 whereby the operator lowers
the ‘guide 12 into the trench 150. The lower end of the
guide extends into the trench 150 and the side walls of
guide frame, a weight cage slidab-ly mounted in the guide
frame and including corner angle irons connected by
upper and lower sets of side plates and an impact plate
the trench 150 serve as guides to maintain the position
of the guide 12 above the back-?ll and the hammer 14
secured to lower ends of the corner angle irons and ex
will securely tamp the back-?ll 152 upon successive lift
tended across the cage, the side and impact plates at the
lower end of the weight cage providing a container for
‘and release thereof as the operator moves the device pro
heavy material whereby upon being ?lled with concrete
gressively down the trench 150‘.
The difference in side dimensions of the device, the
assembly being rectangularly shaped in top plan view, is
important at this stage. There appears to be at present,
two standard widths of mechanically excavated trenches
and, therefore, it is my conception that the outer dimen
sions of the guide 12‘ be such that the guide may be
readily and closely received between the side walls of a
trench of particular width by selectively adjusting the
guide 12 rotatably with respect to the width of its sides.
The guide is then maintained in proper position by the
attachment of the tag line 144 in combination with the
guiding action of the side Walls of the trench.
FIGURE 3 illustrates the effectiveness of the device
in operation closely adjacent a building wall 154. The
danger of the hammer striking the wall is eliminated
since the guide 12 maintains the Vertical movement of
the hammer 14 throughout its entire length of travel.
it will further be understood that the compression force
vof the hammer 14 is variable dependent upon the distance
of free fall allowed the hammer 14 by the operator.
Although my invention is primarily concerned with
or the like the container provides a weight, and a vertical
ly disposed plate secured to the impact plate by angle irons
and extended from said impact plate upwardly to a point
spaced above the lower set of side plates, the upper end
of said vertically disposed plate having a cable receiving
opening therein.
2. In a tamping machine, the combination which com
prises an elongated vertically disposed guide frame in
cluding angle iron corner posts connected by upper, lower,
and intermediate transversely disposed side plates, the
corner posts providing a track, a cable attaching ?ange
extended upwardly from the upper end of the frame, and
cable guiding means in the upper end of the guide frame,
and a weight cage having angle iron corner posts con
nected by side plates and positioned whereby said corner
posts'of the weight cage slide vertically in the corner posts
of the guide frame, an impact plate extended across and
secured to lower ends of the corner posts of the weight
cage, a vertically disposed plate secured to said impact
plate and extended upwardly to a point above lower side
plates of the weight cage, the side and impact plates at
the lower end of the weight frame providing a concrete
‘earth tamping wherein a hammer having a flat impact 55 holding box, and the intermediate part of the weight cage
plate is employed, it is further my conception that the
being provided with a cable attaching plate assembly.
device may be used for other purposes such as demolition
WQI‘K by employing modi?ed hammer assemblies.
3. In a tamper, the combination which comprises an
elongated vertically disposed guide frame, rectangular
URES 9 and 10 wherein the hammer assembly is much
shaped in cross section, and having angle iron corner posts
connected by upper, lower, and intermediate transversely
disposed side plates providing a track, a horizontally dis
posed plate having an opening therethrough mounted on
the same as above described but for the ‘addition of an
upper ends of the posts, a cable attaching flange extended
elongated, downwardly extending blade 160 disposed
upwardly from said plate, spaced longitudinally disposed
For example, a modi?ed hammer may be used for the
purpose of cutting through asphalt pavement or the like
and one embodiment of such a hammer is shown in FIG
transversely of and secured to the under surface of the 65 rollers rotatably mounted on said plate, and positioned
.impact plate 68. The blade has a sharp cutting edge 162.
to register with the opening therein spaced transversely
The remainder of the under-surface of the plate 68 is
*covered with a thick pad or cushion 164, preferably of
disposed rollers rotatably mounted on and suspended
below the opening in said plate, a weight cage having
rubber, suitably secured thereto.
angle iron corner posts slidably mounted in the corner
The cushion 164 protects the area iof the pavement sur
rounding the cut from serious damage during operation
by placing a shock absorbing means between the weight
of the hammer and the surface of the pavement.
A further modi?cation of a hammer assembly is shown
posts of the guide frame, side plates connecting the corner
posts of the weight cage and positioned at upper and
lower ends and at a point intermediate of said upper and
‘lower ends of the corner posts, of the cage an impact
plate connecting lower ends of the posts of the weight
FIGURE 11 wherein a rock breaking head 168 is 75 cage, the side plates at the lower end of the weight cage
and impact plate providing a container for concrete to
form a weight, and cable attaching elements in the upper
portion of the weight cage, a cable for suspending the
weight cage being extended between the longitudinally
disposed rollers and also between the transversely dis
posed rollers carried by the horizontally disposed plate.
References Cited in the ?le of this patent
Kinderman ___________ __ June 19,
Forbes ________________ __ Feb. 9,
Morgan ______________ __ Jan. 24,
Staley _______________ __ Nov. 19,
Friz ________________ __ Nov. 29, 1927
McNeilly ______________ __ Dec. 5, 1933
Ruddock _____________ __ July 18, 1939
Porter ______________ __ Mar. 11, 1941
Pegno ______________ -_ Dec. 15, 1942
Gedge ______________ __ May 30, 1944
Lichtenberg __________ __ Aug. 22, 1944
Scheidt ______________ __ Feb. 26, 1957
Germany ____________ __ June 17, 1902
Germany ____________ __ Aug. 16, 1933
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