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Патент USA US3096983

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July 9, 1963
M, mwm
3,096,975
FAST ACTING CLAMP
Filed June 23, 1960
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MILTON IRWIN
‘
BY
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W 4. wieéialmwn ¢‘
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#. 09d‘ PM
ATTORNEYS
" ice
tates Patent
2
1
3,096,975
FAST ACTING CLAMP
Miiton Irwin, 4609 Nicollet Ave., Minneapolis, Minn.
Filed June 23, 1960, Ser. No. 38,337
2 Claims. (ill. 269-169)
3,096,975
Patented July 9, 1963
FIGS. 7-10 are detail elevation views of still addi
tional modi?cations of a portion of the invention; and
FIG. 11 is an elevation view partly broken away and
partly shown in section of an additional modi?ed form
of the invention.
In the form of the invention shown in FIGS. 1 and 2,
This invention relates to workpiece holding apparatus
the clamping apparatus is designated in general by
and more speci?cally relates to a quick-acting clamp for
securely holding one or more workpieces in a predeter
numeral 10 and includes a rigid and substantially
mined position.
Various types of clamping devices have been known
in the past, including several types of ‘C-clamps. In the
past conventional ‘C-clamps have employed a threaded
C-shaped body 11 having a base or stationary jaw 12
formed integrally therewith and also having a bifurcated
upper portion 13 de?ning spaced and parallel horizon
tally extending legs 14 and 15 de?ning an open armature
receiving space 16 therebetween.
A smooth vertically slidable shaft 17 has an enlarged
shaft which is screwed against the workpiece or work
pieces to hold the same in a predetermined position. Such 15 head 18 on the upper end thereof and has the lower end
portion 17a thereof extending toward the stationary jaw
types of conventional C-clamps have had numerous dis
12 for clamping ‘workpieces W and W’ together thereon.
advantages. In the ?rst place such (‘J-clamps are slow
The lower leg 14 has a shaft aperture 14a therein, and
to operate and remove and when a number of such clamps
the upper leg 15 has a threaded nut-receiving opening
are to be applied to one or more workpieces the time
15a therein. An externally threaded nut 19 has a knurled
consumed in applying and removing the clamps is con
and enlarged upper end 20 and is threaded into the open
siderable. Obviously, in industrial applications the time
ing 115a and the nut 19 has a smooth opening 21 formed
consumed is expensive.
Another distinct disadvantage of clamping devices
therethrough for receiving the shaft 17 in sliding relation.
The shaft is thereby mounted for vertical sliding move
known in the past is that only a limited amount of pressure
can be exerted against the workpiece or workpieces when 25 ment toward and away‘ from the workpieces. The shaft
17 has a removable jaw-forming foot 21 threaded at 21a
clamped, depending upon the nature of the screw threads
onto the threaded corresponding lower end 1701 of the
on the shaft and the means by which the shaft is turned.
shaft to provide a suitable workpieceaengaging surface
It is difficult to obtain any uniformity of holding force
against the workpiece.
An object of my invention is to provide a new and im
proved clamping device of simple and inexpensive con
struction and operation.
Another object of my invention is to provide a novel
21b in confronting relation with the base of stationary
jaw 12.
Means are provided for releasably securing the shaft
in a predetermined position and for forcibly urging the
shaft 17 against the workpieces in order to clamp the
clamping apparatus which may be readily and easily 35 workpieces with a desired force or pressure. In the form
shown such means include a ?at and rigid plate-like arma
operated for applying the desired pressure against the
ture 22 with a shaft-receiving opening 23 therethrough
workpiece or workpieces to be clamped.
and of such size as to receive the shaft 17 in close ?tting
Still another object of my invention is the provision of
and slidable relation when the armature 22 is in the
an improved clamping apparatus which is adapted to
horizontal position shown in FIGS. 1 and 3. The opening
exert varying amounts of force against the workpiece or
23 is formed so that the outer and lower peripheral side
workpieces to be clamped.
wall portion 23a thereof and the upper and inner periph
A further object of my invention is to provide new and
eral sidewall portion 23b are oriented substantially nor
novel clamping apparatus which is adapted to exert a
mal to the upper and lower surfaces of the armature 22.
uniform clamping force against the workpiece or work
pieces to be held in successive operations of the apparatus. 45 The outer and upper peripheral sidewall portions 230 of
the opening and the lower and inner peripheral sidewall
A still further object of my invention is the provision
portions 23d of the opening are oriented at a slight angle,
of ‘a novel and improved clamping apparatus which is
or are slightly oblique to the normal with reference to
readily adaptable for use with workpieces of varying
the upper and lower surfaces of the armature 22. It has
shapes and sizes so as to ei?ciently and e?ectively cause
secure holding of the workpiece or workpieces regardless 50 been found successful in one instance to orient the side
wall portions 230 and 23d at an angle of approximately
of their shapes.
6° from the normal with respect to the upper and lower
These and other objects and advantages of my inven
surfaces of the armature 22.
tion will more fully appear from the following description
The inner end of armature 22 extends to a position
made in connection with the accompanying drawings
wherein like reference characters refer to the same or 55 beneath and partially within the handle-receiving slot
like opening 24 in the upper leg 15 of the body. The
similar parts throughout the several views and in which:
FIG. 1 is an elevational view, partly broken away and
partly shown in section, of the invention;
permit the uppermost central portion 22b thereof ?t up
3--3 in FIG. 2;
FIGS. 4-6 are detail elevation views of modi?ed forms
of ‘a portion of the invention;
pin 26, the ends of which are ?xed in suitable apertures
in the sides of leg '15. It will be noted that the cam 25
is asymmetrically formed around the center of the pivot
upper surface of armature 22 is recessed at 22a so as to
wardly to a small degree into the opening 24. A swing
FIG. 2 is ‘a detail section taken at 2—2 in FIG. 1;
FIG. 3 is ‘an enlarged detail section view of a portion 60 able or rotatably oscillatable cam 25 engages the portion
22b of armature 22 and is swingably mounted on pivot
of the apparatus on a line approximately as indicated at
3,096,975
3
26 so ‘as to produce a downward movement of the portion
22b of the armature when the cam is swung in a clock
wise direction from the full line position shown in FIG. 1.
The cam 25 is connected with a cam-operating handle
27 and in the form of the invention shown, the handle 27
is integral with the cam 25.
A coil spring 28 is applied around shaft 17 in loose
4
ing of handle 27 from its full line position to the dotted
position B thereof, produces a smaller increment of down
ward travel of the foot 21 than had previously been ob
tained.
In a similar manner if the nut 19 is adjusted up
wardly, the increment of downward travel of shaft 17
and foot 21 is increased.
In this respect it will be understood that if the work
pieces W and W’ are substantially ‘?at metal plates, only
?tting relation and the lower end of spring 28 bears against
the lower leg 14 of the body. The upper end of spring
a small increment of downward travel of shaft 17 and
28 bears against the outer end portion of Iarmature 22 10 foot 21 will be necessary in order to produce a very sub
so as to normally urge the outer end of the armature up
stantial clamping pressure (against the workpieces. On
wardly against the lower end 19a of the nut 19.
the other hand, if the workpieces are metal plates or elon
A cover plate 29 is substantially U-shaped and is
gate rods which are substantially warped, then a substan
wrapped around the outer ends of legs 14 and 15 in en
tial increment of downward travel of the shaft may be
closing relation with the space 16 and is secured at the 15 necessary in order to bring the workpieces into engage~
sides of the body as by screws 30.
ment with each other.
A spatter shield 31 of slightly shorter length than the
In FIG. 4 is shown a foot 21’ having a V-shaped notch
shaft 17 is secured thereto by inwardly extending shaft
N in the bottom thereof for engaging a round piece of
engaging tabs 32 at the upper and lower ends thereof
stock or workpiece. The foot 21’ is threaded onto the
which hold the shield on the shaft and permit the shield 20 shaft 17 in the manner shown in FIG. 1.
to be applied to and vremoved from the shaft with a snap
'In FIG. 5 is shown another form of foot 21" having
like action.
a V-shaped bottom surface V for holding a piece of angle
In operation, the armature 22 is released from the shaft
stock in predetermined position.
17 so as to permit free sliding of the shaft in an upward
in FIG. 6, the foot 21" of FIG. 5 is shown, and in this
and downward direction when the armature is in the hori 25 form a demountable base 12' is applied to the body 11
zontal position shown in FIG. 1. The outer end of the a and may comprise an inverted cup-like element receiving
armature bears upwardly against the lower end of nut 19
the conventional base 12 therein and having a V-shaped
and the inner end generally bears against the cam 25. As
nut V’ therein for receiving the outside corner of an
the workpieces W and W’ are being applied onto the base
angle bar.
or stationary jaw 12, the shaft may be moved upwardly 30
FIG. 7 shows still another shape of foot 21—3 having
to the position A shown in dot-dash lines so as to move
the foot 21 upwardly correspondingly. The shaft 17 will
be retained in this position by the very slight frictional
a sharp edge E for engaging and holding a correspond
ingly shaped workpiece.
In FIG. 8 the foot 21-4 has a ball b and ?atdbottomed
relationships of the parts.
swivel foot s thereon.
When the workpieces W and W’ have been properly 35
In FIG. 9 the foot 21-5 has a smoothly rounded tip R
positioned, or conversely, when the clamp 10' has been
for engaging a correspondingly shaped workpiece.
properly positioned in relation to the workpieces, the
In FIG. 10 a foot 21—6 is provided with a smooth
shaft v17 will be manually pushed downwardly so as to
move the foot 21 ‘against the workpiece W so that the
surfaced interior chamber 0 for receiving the smooth lower
end of shaft 17’ which is grooved at 17a’ and is provided
shaft and foot assume the position shown approximately 40 with a retaining ring 17b’ which bears against the inner
in full lines in FIG. 1. The handle 27 is then swung
surface 0 of the foot.
downward from the full line position to the dotted line
The form of the invention shown in FIG. 11 is similar
position B. This swinging of the handle will rotate the
in many respects to the form of the invention shown in
cam 25 ‘which will urge the inner end of the armature 22
FIG. 1 and is provided with a stationary jaw or base
toward the workpiece. The pressure exerted by spring 45 42, but in this instance the body 40 and stationary jaw
28 against the outer end of the armature 22 will cause the
42 are interconnected through the medium- of a work
armature to tilt to the inclined or oblique position shown
bench or table 43‘ to which both the body and stationary
in dotted lines B so that the sidewall portions 230 and 23d
jaw are secured as by bolts 41. In the form of the in
of the opening 23 tightly engage the shaft periphery in
vention the upper body portion de?nes the upper and
frictional, locking relation. The locking of the armature 50 lower legs 44 and 45 respectively, and in this form of the
to the shaft is accomplished during the initial stages of
invention, side walls 46 are also formed integrally with
swinging of the handle 27 and during the ?nal stages of
the body and extend between the upper and lower legs
swinging handle 27 into the dotted position B, the entire
44 and 45 to de?ne the interior chamber area 47 and to
armature and the shaft, which is now locked to the arma
rigidly mount a support or shelf 48 intermediate the
ture, move ‘downwardly to the dotted position B. It will 55 upper and lower legs 44 and 45. The shaft 49‘ slidably
be noted that in the dotted position B the armature 22
extends through a bushing 50 and through the adjustable
has been moved downwardly away from the lower end
nut 51, ‘both of which are threaded into the respective
19a of the nut 19 and the bottom of the foot 21 has moved
legs. A spring 52 bears upwardly against the armature 53
downwardly toward the stationary jaw 12. It will there
which also receives the shaft 49 therethrough in a man
fore be seen that the swinging of the handle 27 from its 60 ner similar to the arrangement previously described in
full line position to the dotted line position ‘B locks the
connection with FIG. '3, and the inner end of the arma
shaft to prevent any upward movement thereof and also
ture is engaged and acted upon by a swinging cam 54
produces a downward movement of the shaft and foot
which is pivoted on pin 55 in the slot-like opening 56 of
in order to exert clamping pressure or force against the
the body to be operated by the handle 57 which is integral
workpieces.
65 with the cam. It will be seen that the spring 52 is sup
It will be understood that it may be desirable to change
ported on the shelf 48.
the increment of downward movement of foot 21 as the
The portion of the apparatus described in FIG. 11 oper
handle is swung downwardly to the position B, depending
ates substantially similarly to the corresponding appa
upon the nature ‘and size of the workpieces W to be
ratus of FIG. 1.
clamped together. In order to vary the increment of
In addition ,a handle-swinging lever 58 is swingably
70
movement of the shaft and foot, the nut 19 may be ad
mounted on 1a pin 59 in a recess 60 of the body 10 and
justed slightly by turning it upwardly or downwardly. In
the outer end of lever 58 engages the handle 57. A coiled’
the event that the nut 19 is adjusted slightly downwardly,
spring 61 which bears against the bottom of recess 60‘
the armature 22 is also moved downwardly slightly against
and extends into a recessed portion 62 of the lever 58,
the pressure of spring 28; and in this instance, the swing- 75 is wrapped around the pin 59 and bears against the lever
3,096,975
5
6
60 so as to normally urge the lever in a counter-clock
tending toward said stationary jaw to clamp‘ a workpiece
thereon, said lower leg receiving and guiding said shaft
through the opening therein, an externally threaded sleeve
receiving and guiding the shaft therein and being thread
wise direction to thereby tend to swing the handle up.
A second armature 63, substantially similar in con
struction to the armature 53 is provided on the shaft be
end of the armature 63. A cam 64 is a?ixed to a rot-at
ed into the opening in said upper leg, said sleeve pro
jecting downwardly from said upper leg, an elongate
plate-like armature in said space between said legs and
able shaft 65 which is journalled in suitably provided
bearing apertures in the side walls 46 of the body and
versely therethrough and slidably receiving said shaft in
neath the shelf 48. A second spring 64 bears against
the stationary bushing 50‘ and upwardly against the outer
which is also a?ixed to a handle or lever 66 at the ex
having a forward end with an aperture extending trans
10 close-?tting relation to lock against the shaft when the
terior of the wall 46 to facilitate operation of the cam
armature is tilted, said armature having .a rear end to be
64 as desired.
tilted and moved downwardly toward the stationary jaw
In the operation of this form of the invention, if cam
64 is swung through an arc of approximately 90° from
to lock the armature to the shaft and move the shaft
toward the jaw, said upper leg having a slot aperture
that shown in FIG. 11, the operation of the apparatus 15 therethrough and extending in a fore-and~aft direction,
said slot aperture having an inner end confronting the
will be substantially identical to that shown in FIG. 1.
rear end of the armature to provide access thereto, a
Swinging of the handle downwardly will ?rst cause the
spring between said lower leg and the forward end of
armature ‘53 to lock against the shaft 49, and will then
the armature and urging the armature away from the sta
produce a downward movement of the shaft and arma
ture to produce the small increment of downward move 20 tionary j-aw, an upright elongate handle having an inner
ment of the foot against the workpiece.
cam-ming end portion projecting through said slot aper
In this form of the invention after the cam 64 is svwlng
to the position shown in FIG. 11, the armature 63 is
ture and engaging the rear end of the armature, pivot
means mounting said handle in the slot aperture for
swinging rearwardly and downwardly to a substantially
tilted and locked against the shaft 49 to prevent any up
ward travel of the shaft 49. The conventional down‘ 25 horizontal position, said slot aperture having handle
engaging end surfaces respectively engaging the handle
ward swinging of the handle 57 will lock the armature 53
when the handle is swung to upright ‘and horizontal posi
to the shaft and will move the shaft and armature down
tions, the inner camming end portion of the handle being
wardly through a small increment of travel. When the
asymmetrically shaped about said pivot means and co
shaft 49 is moving downwardly, the outer end of arma
ture 63 moves downwardly slightly and allows the shaft 30 operating with the spring to produce tilting and down
49 to slide downwardly therethrough, but when the down
ward and upward movement of the rear end of the arma
ward movement of the shaft 49 is terminated, the arma
ture 63 again locks against the shaft and prevents any
upward movement thereof. The handle 57, after re
ture when the handle is successively swung in opposite
directions, and a substantially U-shaped cover having
rearwardly extending side panel portions lying along said
lease, will then be swung upwardly by operation of lever 35 upper and lower legs and enclosing said space therebe
58, and of course the armature 53 will move upwardly
against the nut ‘57 and will be in unlocked relation with
the shaft. Downward swinging of handle 57 will pro
duce another increment of downward travel of shaft and
armature 53, and again, the armature ‘63 will allow the
shaft 49 to travel downwardly but will restrain any up
tween and said cover also having an intermediate por
ward movement.
It will be seen that handle 57 may be oscillated to pro
duce a sequence of incremental movements of the shaft
body portion having an upwardly facing stationary jaw
tion interconnecting said side panel port-ions and being
wrapped around the front ends of said legs.
2. A clamping device comprising a rigid C-shaped
body having forwardly projecting upper and lower por
tions in confronting relation with each other, said lower
thereon, the upper portion of said body being bifurcated
and de?ning a pair of forwardly extending and spaced
49 and the foot so that regardless of the nature of the 45 upper and lower legs having vertically aligned openings
workpiece to be clamped, all of the necessary slack may
be taken up so as to produce the desired clamping action
and so as to produce the desired pressure against the
therein and having front ends, said legs de?ning an un
obstructed space therebet-ween, 1a longitudinally movable
shaft extending toward said stationary jaw to clamp a
workpiece thereon, said lower leg receiving and guiding
workpiece or workpieces.
To release the workpieces in the form of the inven 50 said shaft through the opening therein, an externally
threaded sleeve receiving and guiding the shaft therein
tion in FIG. 1 the handle 27 is merely raised, whereupon
and being threaded into the opening in said upper leg,
the pressure against the workpiece is relieved and shaft
said sleeve projecting downwardly from said upper leg,
17 may be manually lifted.
an elongate plate-like armature in said space between said
To release the workpiece in the form shown in FIG.
an aperture extend
1='1, the handle 57 will be swung downwardly to the posi 55 legs and having a forward end
tion shown to relieve the holding force on armature 63,
whereupon the [lever 66 and cam 64 may be swung
through a quarter of a turn and when the handle 57v is
ing transversely therethrough and slidably receiving said
shaft in close~?tting relation to lock against the shaft
when the armature is tilted, said armature having a rear
end to be tilted and moved downwardly toward the sta
again raised, the workpiece will be released. The shaft
49 may be then manually lifted.
60 tionary jaw to lock the armature to the shaft and move
the shaft toward the jaw, said upper leg having a slot
It will, of course, be understood that various changes
aperture therethrough and extending in a fore-and-aft
may be made in the form, detail, arrangement and pro
direction, said slot aperture having an inner end confront
portion of the parts without departing from the scope of
ing the rear end of the armature to provide access there
my invention which consists of the matter described
herein and set forth in the appended claims.
65 to, a spring between said lower leg and the forward end
of the armature and urging the armature away from the
What is claimed is:
stationary jaw, an upright elongate handle having an‘
l. A clamping device comprising a rigid c-shaped body
inner camming end portion projecting through said slot
having forwardly projecting upper and lower portions in‘
aperture and engaging the rear end of the armature, and
confronting relation with each other, said lower body
portion having an ‘upwardly facing stationary jaw there 70 pivot means mounting said handle in the slot aperture
for swinging rearwardly and downwardly to a substan
on, the upper portion of said body being bifurcated and
tially horizontal position, said slot aperture having handle
de?ning a pair of forwardly extending and spaced upper
engaging end surfaces respectively engaging the handle
and lower legs having vertically aligned openings therein
when the handle is swung to upright and horizontal posi
and having front ends, said legs de?ning an unobstructed
space therebetween, a longitudinally movable shaft ex 75 tions, the inner camming end portion of the handle being
3,096,975
7
asymmetrically shaped ‘about said pivot means and co
operating With the spring to produce tilting and down
ward and upward movement of the rear end of the arma
ture when the handle is successively swung in opposite
directions.
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,599,895
John _______________ __ Sept. 14, 1926
8
2,221,326
2,262,429
2,308,'105
v2,472,658
2,602,358
2,612,805
2,846,907
2,863,477
Holman ____________ __ Nov. 12, 1940
Lucker _____ _________ __ Nov. 11, 1941
Purdy _______________ .._ Jan. 12, 1943
Gilbert ______________ __ June 7, 1949*
*Lile _________________ __ July 8, 1952
Heinrich ______________ __ Oct. 7, 1952
Sprink ______________ __ Aug. 12, 1958
Sagerty ______________ __ Dec. 9, 1958
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