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Патент USA US2604915

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July 29, 1952
w. D. CROSBY
2,604,910
PORTKBLE POWER-DRIVEN BAND SAW
Filed July 29, 1948
4 Sheets-Sheet 1
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Wilbur D. Crosby
INVENTOR.
July 29, 1952
w. D. CROSBY
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2,604,910
‘PORTABLE POWER-DRIVEN BAND SAW
‘
Filed July 29, 1948
4 Sheets-Sheet 2
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Wilbur D. Crosby
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INVENTOR.
July 29, 1952
w. D. CROSBY
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2,604,910
PORTABLE POWER-DRIVEN BAND SAW
Filed July 29, 1948
4 Sheets-Sheet 3
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Wilbur D. Crosby
INVENTOR.
July 29, 1952
w. D. CROSBY
2,604,9 10
PORTABLE POWER-DRIVEN BAND SAW
Filed JuIy 29, 1948
4 Sheets-Sheet 4
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Patented July 29, 1952
2,604,910
UNITED STATES PATENT
OFFICE
2,604,910
PORTABLE POWER-DRIVEN BAND SAW'
Wilbur D. Crosby, Orinda, Calif;
1
Application July 29, 1948; Serial No. 417,386
4 Claims. (01. 14-3--19_)
This invention comprises novel ‘and useful im-
' \
Figure 10 is a vertical transverse sectionalde
tail view taken substantially on thecplane ot‘sec
tion line Ill-l0‘ of Figure 4, illustratinginpar
ticular the disposition of the electric.v motor in a
compartment. in the base and. outer sections‘ of
provements in a portable power driven band saw
and more speci?cally pertains to a saw of thewell
known hack saw type having a band saw therein
operated by an electric motor carried by the saw
for cutting meat, metal, or the like and particu
the frame of the saw;
‘
larly adapted for use by surgeons, butchers, metal
Figure 11 is a verticaltransverse sectional de
workers, or carpenters‘
tail view taken substantially on the plane of sec
The principal objectof this invention, is to pro
tion line ll-ll' of Figurei‘i,.and illustrating: in
vide a portable power driveni band. saw having 10 particular the slide. and: guide arrangement for
an improved, well balanced, light, weight con
supporting and adjusting; the tensioning and
driving pulley of the. saw operatingmeans;
struction and which is highly efficacious for the
purposes intended‘.
Figure 12 (Sheet 1)‘ is a vertical: transverse
Subordinate speci?c objects of the invention
sectional detail view taken, substantially on the .
are to provide an improved power driving means '
for an endless portable band saw, including an Y
improved mounting oi’ a driving electric motor
in the handle of the saw.
plane of sectionline l2.--|2 ofsFigurelirthisview
indicating more clearly the arrangement ofithe
saw bladetensioning means;.
- '
Figure‘ 13 (Sheet 4) is a. horizontallsectional
These, together with various ancillary features
detail view- taken upon anvenlarged‘ scalesub
and objects of- the invention which will" later be 20 stantially on the. plane of section line li-l'i of
come apparent as the following description pro
Figure 4, and illustrating in particular the driv
ceeds are attained by vthis device, a preferred em
ing connection between themotor and. the saw
blade driving pulley ;‘
'
'
bodiment of which has been illustrated by way of
example only in the accompanying drawings,
Figure 14' (Sheet 2) is a’ vertical transverse
wherein:
~
25 sectional detail View taken‘ upon an enlarged
Figure 1 is‘ a side elevational view of apre
scale substantially; on thegplane, of section line
I4—,I4 of Figure 4 andlillustrating. a set'of'saw
ferred embodiment of'the invention;
Figure 2 is a top‘planviewthereof;
Figure 3 is a side elevational view, oi'a cover
section of the frame of the saw ;'
; .
guide rollers;
Figure 4 is a side elevational' viewlot the base
the invention; and,
section of'the frame of the vsavvgthemounting
J
'
>
‘
n
v
'
Figure 16 (Sheet 4) is; a- diagrammatic ‘view
of a suitable electricalhcircuit for ,oper'ating'and
controlling the motor forming‘ a part lOf f the in-.
of the various elements of the saw driving and
controlling means being illustrated therein;
Figure 5 is a top plan view of Figure 4;
.
Figure 15, is an enlarged perspectiveview‘of
30 vone of the saw guide blocks, formingta- part of
35
vention.
-
v
Referring now more speci?cally to the accom
Figure '6 (Sheet 1) is a vertical transverse sec
tional detail‘ view taken substantially on the
panying drawings, wherein like numerals; desig
plane of the section line 6-6 of Figure 4 and
nate similar parts‘ throughout the ‘various; views,
illustrating a guide. roller forming a part of the
attention is directed ?rst-tothe frame construc
invention together with its mounting in the base 40 tion of theportable, band saw,. Which frame, in-'
cludes complementary base and coverv casing‘sec
and cover-sections oi! l'thesaw frame;
tions In and I2 respectively, The. casing con
Figure 7 is a vertical‘t'ransverse sectional de
tail view taken substantially on the plane of
sists of the two‘ sectionsl?fand' |2< which are suit
ably and detachably ‘connected tolea'c'hpother in
section line 1—-1 of Figure 4‘and illustrating. the
construction, mounting and function of onerof 45 any desired manner, is' shaped‘in the former a
conventional hack saw, ‘having: an open side
the saw blade guide blocksiof the invention}.
forming a throat or recess. de?ned'by‘the outer ‘
Figure 8 is a vertical.transversesectional de
Portion l4 and the inner'po'rtion l?'of' the frame
tail view taken substantially- on the. planeol’ sec
casing,,tog_ether with a conventional handxgrip
tion line 8--8 of Figure lland illustrating in par
ticular the mounting and arrangement of the 50 portion l8 thereon. In, order tofacilitate-the use
rotary’ brushes forming» a: part 01" the invention;
of the saw; the outerrend' l4’ isprovi'dedwitha
Figure 9 (Sheet 4)’ isa vertical transversesec
terminal-knob or handle‘ 2lliwhich may ‘be‘ em
ployed in, conjunction withtthe. hand grip-portion‘
tional detail view taken 1 substantially on; the
plane of section line 9-4-01’ Figure 4,‘ the outer
section or the-framebeing shown applied to the
base section thereof?‘
i
'
l
55
to assist in conveniently:manipulating; posi
tioning‘ and holding-.theltoolh
f . 'i ' “
I‘
'
As- may beibest observed by reference to Figure
2,604,910
3
-
4, a ?exible endless saw band 22 of suitable me
tallic construction and composition is rotatably
4
screw 68, which is accessible from the opening
64 in the handle I8, the slide 36 may be moved
towards the handle, thereby tightening or ten
sioning the saw blade. Obviously, by moving
the screw 68 in the other direction, the tension
guided and journaled in a chamber 24 formed in
the base section ID, by means of a plurality of
suitable guide pulleys or rollers 26. That por
may be released from the blade as desired.
tion of the saw blade which is housed within the
By reference to Figures 4 and 10' it will be
chamber 24 is disposed in a manner perpendicu
readily, seen that the frame casing sections In
lar to the plane of the saw frame, that is with
and I2 arelaterally enlarged to provide a com
the teeth of the blade disposed laterally of the
frame and with the side of the saw blade en' 10 partment ‘I2 ‘within which is securely mounted
the motor 60. This motor may be conveniently
trained over the guide rollers 26, as will be more
but removably secured in the compartment ‘I2
readily apparent by reference to the detailed
and mounted upon the base section I0 by means
views of Figures 6-11. Further guide means are
of a pair of fastening bolts ‘I4 whose outer ex
provided for twisting about its longitudinal axis
and through ninety degrees, that portion of the 15 tremities arev accessible as indicated in Figure 9
and in dotted lines in Figure 4, from the inner
saw blade indicated by the numeral 28, which ex
surface or wall I6 of the notched portion of the
tends across the open side of the frame between
saw frame. Thus, by merely removing the cover
the outer and inner sides I4 and I6 of the frame,
section I2, convenient access can be had to the
which guide means are of a particular construc
20 motor 60, the gearing connecting the motor with
tionito be hereinafter more fully described.
the driving pulley 32 as well as-to the sawblade
Inwardly of the saw frame and closely adjacent
22 throughout its entire length,
to the saw handle I8, the chamber 24 is pro
Attention is now directed to the construction
vided with a centrally enlarged portion 30 form
of the guide members or blocks 16 and '18, which
ing a compartment within which is housed the
saw blade driving pulley 32, about which the saw 26 are respectively mounted uponthe base section
II] of the saw frame case upon the inner and
blade is entrained, which driving pulley is pro
outer portions I6 and I4 respectively. These
vided with a driving gear 34 which may be of
guide members which may be of identical con
the well known ring gear type, by means of which
struction are detachably carried by and mounted
the driving pulley is operated.
As will be more readily understood by reference 30 within the casing base sectionyIIl and may be of
any suitable form or shape, that indicated at
to Figures 4, 1,1, and 13, a support 36 in the form
Figure 15 being regarded as highly satisfactory
of a bar of generally rectangular cross section
for the purposes of. this invention; The guide
is provided with a fulcrum pin 38 by means of
member ‘I6 may conveniently, comprise a block
which the driving pulley 32 is rotatably journaled
upon the support. This support 36 constitutes 85 of, generally rectangular jconstruction having
suitable apertures 8|] for the‘reception of screws
a slide which is guidingly' received in a guide
or other fastening means 82 (Figure 10) by means
channel 40 formed in the base section I0, which
of which the block may be detachably secured
guide channel extends substantially longitudi
to the base section II). One face of the block
nally of the saw frame and substantially medially
40 such as that indicated at ‘8,3 is provided with a
lateral, spirally twisted ,guiding slot or notch
As shown best in Figure 13, the inward ex
having inlet and outlet portions “and 86 which
tremity of the support 36 is provided with an
are ‘spirally twisted at a- predetermined angle
axial bore or recess 42‘ in which is detachably,
rotatably but non-slidably secured as by a set » with respect to each other, whereby the saw.
screw 44, and. annular .groove v46, the inner ex 45 blade 22 passing therethrough will be twisted at
its longitudinal axis to any extent desired._ Ob
tremity 48 of a pinion shaft 50' having a driving
viously, this angular relation'may be any desired
pinion 52 rigidly mounted thereon-and in con
extent, whereby a relatively moderate twist may
stant meshing engagement with the ring gear
be imparted or whereby as much as'nmety ‘de
34. The outer extremity of the pinion shaft 50
is provided with a diametrically disposed pin or 50 gree twist may be'imparted to that portion of the
blade, indicated at 28, which lies between the
key 54 which is non-rotatably but axially slid
two guide members ‘I6 and ‘I8. 7
'
ably received in a diametrical slot 56 formed in
As viewed in Figure 4, it is the function of the
the end of the armature shaft 58 of the electric
guide member 16 to twistv the blade from the hori
motor indicated at 60.
a a
As will thus be seen, the pinion shaft is con 55 zontal position of the same, a; in which position
the blade is carried within; the casing chamber
tinuously in driving engagement with the motor
24, to a substantially vertical position which the
60, but is capableof axially slidable movement
blade assumes between the, portions I4 and I6,
relative to the motor armature shaft 58 in ac
in order to position the teeth-pf the blade in a
cordahcewith sliding movement of the support
36 by which the pinion shaft is rotatably carried. 60 manner ready for employment-pv Obviously, the
function of the guiding means ‘I8 is ;to return the
Thus, the drive pinion 52, the ring gear 34 driven
blade from the position indicatedat 28 through
thereby and the saw blade driving pulley 32 may
the necessary number of degrees of rotation about
be longitudinally adjusted relative to the frame
the longitudinal axis of ‘the. blade, in' order to
of the-saw for tensioning the saw blade without
in any way impairing the driving engagement 65 properly position the blade for passage through
the guiding channel or chamber 24; ‘Y
'
of the motor 60 therewith.
Disposedin the saw frame and mounted; upon
To effect this tensioning adjustment, a slot or
the base section It thereof, and inwardly of the
channel 62 is provided in communication with
adjacentsides of the guide members ‘I6 and ‘I8,
the opening 64 of the handle portion I8, and
with the chamber 30 and alug 66 is provided in 70 or sets of guide rollers .which- serve ‘to hold the
portion 28 of the blade toithe desired position in
the channel 62 for rotatably but non-slidably
the plane of the sawv frame, and serve to steady
receiving an adjusting screw 68-, . whose inner
and reinforce the portion :28, against side strain,
extremity is threaded into the bore ‘I0 indicated
as- well as shocks orvibration during use. One
by dotted lines in Figure 4, in the support mem
ber .36, whereby upon rotation of the adjusting 75 of these sets of guide rollers; has been indicated
thereof.
,
,
2,604,910
5.
6.
in Figure 14,7'it being understood that the other
any particular type of saw, but may. be employed
through a variety of ?eldsof utility, being espe
set is identical therewith. The set includes ver
tically spaced upper and lower pairs of co-axial
rollers 88 and 90, respectively mounted upon
axles 92 and 94 journaled in the frame members
I0 and I2, for receiving the saw blade 22, there
between. If desired, the rollers 88 may be formed
integrally with each other and also integrally
with the axle 92 while the rollers may likewise
be formed integral with each other and/or inte 10
gral with the axle 94.
1
'
cially adapted for use in saws, for use by sur
geons or butchers, by metal workers, by car
penters or cabinet makers and by other artisans.
Since numerous modi?cations and changes will
readily occur to those skilled in the art after a
consideration of the foregoing specification and
accompanying drawings, it is not desired to limit
the invention to the exact construction shown and
described, but all suitable modi?cations and
equivalents may be ‘resorted to falling within the
scope of the appended claims.
Having thus disclosed and described the in
As will be readily seen, these rollers engage
the saw tooth edge and the opposite edge of the
portion 28 of the saw blade and serve to laterally
brace and position the same throughout its travel 15 vention, what is claimed as new is as follows:
between the frame members I4 and I6.
1. A portable power driven band saw com
Mounted upon the frame portion I4, upon the
prising a frame including a housing having com
base section I 0, at the extreme inward extremity
plementary sections, an endless saw blade re
of that portion, are a pair of rotary brushes 9*6,
volvably journaled in said housing, said housing
journaled upon an axle 98 and positioned for 20 having an opening in one side, said saw blade
embracing and engaging the opposite sides of the
being disposed across said opening, a guide chan
blade portion 28 in advance of the set of guide
nel in said housing slidably receiving said blade
rollers 88 and 90 upon the portion 14, these
in positions perpendicular to the plane of the
rotary brushes serving to remove any ?lings or
frame, guide members within said housing at op
cuttings of metal, wood, bone or the like carried
posite ends of said opening, said guide members
by the teeth of the blade, to prevent the induc
positioning that portion of the blade extending
tion of this matter into the mechanism of the
across the opening in the plane of the saw frame,
power operated saw.
an electric motor received within said housing,
Any suitable operating means may be provided
a driving connection within said housing between
for controlling the operation of the electric mo
said-motor and said saw blade, a saw blade ten
tor 60. It is merely essential for the purposes of
sioning means, said driving connection includ
this invention that such control means shall be
ing a support slidably journaled in said frame, a
completely convenient and accessible to the hand
saw blade driving pulley journaled on said sup
of the operator which grips the handle I8 for
port, a gear mounted on said pulley, a pinion
instantaneous control thereby. One such satis
shaft journaled on said support, a pinion secured
factory arrangement consists of the switch mech
to said pinion shaft and meshing with said gear,
anism indicated in Figure 4 and which comprises
said pinion- shaft having a non-rotatable, longi—
an operating, ?nger grip lever I00 pivoted as at
tudinally slidable connection with said motor,
I02 to any suitable portion of the frame of the
said tensioning means consisting of adjusting
saw. A spring means I04 urges the control lever 40 means for longitudinally sliding said support.
I02 in its inoperative position. A ?xed electric
2. A portable power-driven band saw compris
terminal I06 is insulatingly mounted and carried
ing a frame and an endless saw blade, said frame
by the handle portion I8, and cooperates with a
including a handle and a saw ‘supporting arm
movable terminal I08 pivotally mounted as at
extending laterally therefrom and having an
I I 0 and likewise insulated from the frame of the 45 opening therebetween, channels disposed in said
saw. A spring means I I2 urges these switch con
handle and arm, said saw blade being mounted
tacts apart, the contact I08 being closed by the
in said channels in positions perpendicular to the
switch lever I08 which may be of insulating ma
plane of the frame and having a portion extend
terial.
ing across said opening, said portion being posi
A main control switch H4, Figures 1 and 12, 50 tioned in the plane of said frame, said handle
which may be of the well known tumbler type,
having a pair of communicating chambers
is mounted in the cover section I2, and provided
therein, an electric motor disposed in one cham
with suitable electric conductors IIB, Figure 16,
ber, the channel in the handle intersecting the
connected in circuit with the ?xed and movable
other chamber, saw driving means disposed in
switch contacts I06 and I08, and by means of 55 the other chamber and connected to said motor
suitable electric conductors H8 with the above
and to said saw blade, tensioning means extend
mentioned electric motor 60, the conductors II8
ing from the exterior of the handle into said other
conveniently extending ‘through complementary
chamber and connected to said saw driving
channels I29 and I22 formed respectively in the
means for shifting the latter whereby the tension
cover section I2 and the base section I0 as shown 60 of the saw blade may be varied, coupling means
in Figures 3 and 4.
connecting said saw driving means to said electric
Thus, the electrical wiring of the device is con
motor and permitting axial movement between
veniently and safely concealed and housed within
the motor and saw driving means but preventing
compartments formed in the complementary cas
rotational displacement therebetween.
ing sections of the frame and the master switch -65
3. A portable power-driven band saw compris
II4 as well as the ?nger grip switch lever I00
ing a frame and an endless saw blade, said frame
are conveniently disposed for operation by the
hand of the operator which grasps the handle
section I8.
tending laterally therefrom and having an open
understood and further explanation is believed
to be unnecessary.
It is to be distinctly understood that the prin
cipals of the invention are not limited to use in 76
the plane of the frame and having a portion ex
tending across said opening, said portion being
positioned in the plane of said frame, said handle
having a pair of communicating chambers there
including a handle and a saw supporting arm ex
ing therebetween, channels disposed in said
From the foregoing, the construction, operation 70 handle and arm, said saw blade being mounted
and advantages of the invention will be readily
in said channels in positions perpendicular to
2,604,910
7
8
in, an electric motor disposed in one chamber,
the channel in'the handle intersecting the other
blade may be varied, said saw driving means in
cluding a slide, means in said other chamber
chamber, saw driving means disposed in the other
chamber and connected to said motor and to
said saw blade, tensioning means extending from
the exterior of the handle into said other cham
ber and connected to said saw driving means for
shifting the latter whereby the tension of the
saw blade may be varied, said saw driving means
motor and said pulley, said operating means com
prising a shaft, a couplingslidably but non-ro
slidably and guidingly receiving said slide, a drive
pulley journaled on said slide and engaging said
saw-blade, operating means connecting said
tatably connecting said shaft to said motor,
means rotatably but non-slidably mounting said
including a slide, means in ,said other chamber 10 shaft on said slide, gearing connecting said shaft
to said pulley.
,
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slidably and guidingly receiving said slide, a drive
WlLBUR D. CROSBY.
pulley journaled on said slide'and engaging said
saw-blade, operating “means connecting said
motor and said pulley.
REFERENCES CITED
-
The following references are of record in the
4. A portablev power-driven saw comprising a 15
?le of this patent:
frame and an endless saw blade, said frame in
cluding a handle and a saw supporting arm ex
UNITED STATES PATENTS
tending laterally therefrom and having an open
Number
Name
Date
ing therebetween, channels disposed in said
451,199
Kesseler _________ __ Apr. 28, 1891
20'
handle and arm, said saw blade being mounted
1,374,638
De Cew, et a1 ______ __ Apr. 12, 1921
in said channels in positions perpendicular to the
1,438,540
McKenna ________ __ Dec. 12, 1922
plane of the frame and having a portion extend
1,449,805
Arnold et a1 _______ __ Mar. 27, 1923
1,453,335
Bennett ____ r.‘ _____ __ May 1, 1923
having a pair of communicating chambers there 25 1,454,735
1,512,425
in, an electric motor disposed in one chamber,
1,516,529
the channel in the handle intersecting the other
2,113,931
chamber, saw driving means disposed in the other
chamber and connected to said motor and to said
saw blade, tensioning means extending from the 30 Number
exterior of the handle, into said other chamber
863,640
and connected to said saw driving means for
shifting the latter whereby the tension of the saw
Hamlin _; _________ __ May 8, 1923
ing across said opening, said portion being posi
tioned in the plane of said frame, said handle
Klopfenstein ______ __ Oct. 21, 1924
Hall ______________ __ Nov. 25, 1924
Biro _____________ __ Apr. 12, 1938
FOREIGN PATENTS
‘Country
Date
France ____________ __ Jan. 6, 1941
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