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Патент USA US2113084

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April 5, 1938.
J. F. HEWITT ET AL‘
2,113,084
HAMME R
Filed Nov. 23, 1937
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INVENTORS
J. F. HEM/\TT
BY
J- H - HOERSTER
ATTORNEY.
Patented Apr. 5, 1938
2,113,084
UNITED STATES
PATENT‘O‘FF‘ICE
2,113;084 '
HAMMER.
John. F. Hewitt and John1H..:Hoerster,IPOrtland,
.Oreg.
'
Application‘ November 23, 1937, Serial No. 176,024
5 Claims.
‘This invention relates’ generally to tools, and
particularly to a hammer.
' ’
,
’
‘The main object of this invention is the con
struction of a mechanically driven hammer whose
5 operation may be easily controlled in a manner
that the blow struck thereby may range ‘from
alight tap to a blow of considerable'force.
The second object is to so construct the ham
mer that its parts will be simple to manufac
10 ture and will not require extreme accuracy in. its
production.
‘
(Cl. v125-33) '
vided with the spring urged plungers '23 which
are adapted to engage the recess 20.
On the
end of the handle I2 is disposed an anti-friction
bearing 24 in which journals the drive shaft 25.
The shaft 25 has an enlarged end 26 which jour
nals in the bronze bushing 21. In the enlarged
portion of the drive shaft 25 is formed a cylin
drical opening 28 adapted to receive the enlarged
portion 29 of the eccentricshaft 30.
The third object is the construction of a ham
mer of the class described which will lend itself
to use where compressed air is not available.
The ‘fourth object is the construction of a
drive ‘shaft 251s close to ‘the ?attened face l6
Fig. 5 is an end elevation of the eccentric shaft
30 and drive shaft ‘showing the parts in a driving
thereby rotating the’ec‘centric shaft 130. Aithrust
bearing 42 is placed against the end of the col
i 145
v
Theshaftj? ‘hasfformed on one end thereof 10
an. eccentric pin 3| which extends ‘into the slot
'llrvof the plunger'l5 while vthe end 32 of the
of the plunger "[5.
'
Slidably disposed on the ‘drive shaft‘ 25 is a 15
mechanical hammer which may be operated by c‘ollar'33 which is drivably‘connected to the shaft
a rotating ?exible shaft.
I25by'n'1eans of vthe spline'34. On the'drive shaft
‘These and ‘other objects are ‘accomplished in 25'is secured the'?anged collar 35 "by means of
the manner set forth in the following speci?ca
the set screws 36. A spring 31 is placed 'around
tion as illustrated in the accompanying drawing, ‘the shaft'25 between the collars 35 and 33 for 20
in which:
'
‘the purpose of urging same apart. The drive
Fig. 1 is a perspective view of ‘the device.
shaft 25'is provided with a cut-away portion 38,
Fig. 2 is a section taken along the line ‘2——2 which communicates with the cylindrical open
in Fig. 1.
ing 39 in which journals the eccentric shaft 30.
Fig. 3 ‘is a section taken along the line 3-3 A tangent pin '40 extends through the collar 33 25
25
in Fig. 2.
.and‘into vthe eccentric ‘shaft 30 which shaft has
Fig. 4 is a section taken along the lineT4-4 in "formed therein a spiral groove 4| adapted to
Fig; 2.
permit the collar "33 to ‘move longitudinally and
position.
Fig. 6 is a view similar to Fig. 5 but showing
the parts in a neutral position.
Fig. '7 is a side elevation of the plunger.
35
Fig. 8 is a section taken along the line 8—8
in Fig. 2.
Similar nmnerals refer to similar parts
throughout the several Views.
Referring in detail to the drawing, there is
40 shown the tubular head It] having a side out
let ll upon which is mounted a tubular handle
l2. Mounted in the ends of the head In are
the bushings l3 on the outer side of which are
placed the grease retainers l4. Extending
45 through the bushings l3 and grease retainers
I4 is a cylindrical plunger [5 having formed on
one side thereof a ?at area l6 through which
is formed the slot I‘! which is inclined with re
lation to the longitudinal axis of the plunger I5.
50 The opposite ends of the plunger l5 are pro
vided with the chambers l8 and I 9, each of which
is provided with a recess 20.
In this case we have illustrated a single tool
2| having a work engaging head 22 which may
The tool 2| is pro
55 be of any desired shape.
lar'33.
'
-
A sleeve 43 is slidably mounted on the shaft
25. The sleeve 43 has formed on one end there
of a ?ange 44 which engages the thrust bearing
42. The sleeve 43 is preferably non-rotatable
and has its sides 45 ?attened to receive the arms
46 of a forked lever 41 which is pivoted on the
pin 48 and is operated by means of a hand lever
49. The arms 46 engage the ?ange 44.
The shaft 25 is provided with a tapped hole
50 to receive the end of the ?exible drive shaft
5| which maybe rotated by any convenient
source of power.
The operation of the device is as follows:
When rotary motion is supplied to the shaft
25 by means of the ?exible drive shaft 5|, it
causes the eccentric shaft 30 to revolve about
the axis of the shaft 25 which coincides with
the axis of the pin 3| when the device is in a
neutral position, in which event the pin. 3| mere 50
ly rotates within the slot ll. However, when the
lever 49 is moved toward the handle [2, the arms
46 move to compress the spring 31 by sliding
the collar 33 along the shaft 25. This move
ment causes the pin 40 to move along the groove 55
2
2,118,084
4i and rotate the eccentric shaft 30 on its axis
causing the pin 3| to assume a position which is
eccentric with relation to the shaft 25, and since
the pin 3| is rotated with the shaft 25, the re
sult is a reciprocating movement at the plung
er l5.
Obviously, the more the hand lever 49 is moved
toward the handle l2, the greater will be the
degree of eccentricity and the greater will be
ll) the force of the blow struck by the hammer
head 22.
It must be understood that while the present
drawing illustrates a desired form of this in
vention, it is not intended that the claims shall
15 be limited to the precise form shown, it being
intended to cover all forms and modi?cations of
this invention which fall fairly within the ap
pended claims.
We claim:
1. A mechanically driven hammer having a
slidable tool holding plunger. having a slot formed
in the side thereof, a handle for supporting said
plunger, a drive shaft mounted in said handle, an
eccentric shaft eccentrically mounted in said
25 handle in a manner that a portion thereof may
be moved to and from a concentric position, said
portion occupying said slot and means for con
trolling the degree of eccentricity of said slot oc
cupying portion.
2. The device of the class described having in
combination a head, a plunger slidably mounted
in said head, a handle attached to said head, a
drive shaft rotatably mounted in said handle,
said drive shaft having an opening formed there
35 in parallel with its axis and spaced therefrom, an
eccentric shaft having a portion thereof occupy
ing said opening and having an eccentric portion
projecting beyond the end of said drive shaft
into said plunger, said plunger having a trans
40 verse slot formed therein adapted to receive said
eccentric portion, a spring urged collar mounted
on said drive shaft, a tangent pin mounted in
said collar, said eccentric shaft having a spiral
groove therein into which said pin projects and
45 means for moving said collar longitudinally
along said drive shaft for the purpose of rotating
said eccentric shaft and varying the degree of
eccentricity of the end thereof.
3. In a device of the class described, the com
30
50 bination of a head having a handle on the side
thereof and having a plunger slidably mounted
therein normal to said handle, a drive shaft
mounted in said handle having an eccentric shaft
eccentrically mounted therein so that a portion of
said eccentric shaft may be rotated to a concen
tric position with relation to said drive shaft,
said eccentric shaft having a spiral groove formed
therein, a collar on said drive shaft having a tan
gent pin therein adapted to engage said groove,
a spring in said handle adapted to urge said col
lar in a direction which will move a portion of
said eccentric shaft to a concentric‘ position, an
anti-friction bearing engaging said collar, a
?anged sleeve engaging said bearing, a forked
lever engaging the flange of said sleeve, means
for actuating said lever in a manner to compress 15
said spring and a plunger in said head having a
slot formed therein adapted to receive said ec
centric shaft end, said slot being characterized
by being inclined with relation to the axis of said
plunger.
4. In a hammer of the class described, a slid
able tool holding plunger having a slot formed
across one side thereof, said slot being inclined
with relation to tile direction of movement of
said plunger, an eccentric shaft having one por
25
tion thereof projecting into said slot and having
the second portion thereof rotatably mounted
within a drive shaft, said second portion being
eccentric with relation to said drive shaft, means
for varying the relation between the positions of 30
said drive shaft and eccentric shaft and means
for rotating said drive shaft.
5. An eccentric-drive for mechanical hammers
consisting of a drive shaft having an eccentric
shaft eccentrically mounted therein, said eccen 35
tric shaft having projecting from the end thereof
and in eccentric relation thereto a pin which may
assume a position concentric with relation to said
drive shaft or eccentric with relation thereto, to
gether with a cylindrical plunger having a flat 40
tened side adjacent to said drive shaft, said
plunger having a slot formed in said flattened
side inclined with relation to its axis, said slot
being adapted to receive said pin, said plunger
being reciprocated by the rotation of said drive 45
shaft to a distance corresponding with twice the
distance between the neutral position of said
drive shaft and the eccentric position thereof.
JOHN F. HEWITT.
JOHN H. HOERSTER.
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