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Патент USA US2409942

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Oct. 22, 1946.
I
E. L. KENT
2,409,941
INTERVAL CONTROL MECHANISM
Filed Jan. 5, 1944
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Patented Oct. 22, 1946
2,409,941
UNITED sTATEs 412.2!:1'1.EurIïá oFFicE
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2,409,9411
INTERVAL CONTROL .MECHANISM
Earlc L. Kent, Elkhart, Ind., assignor'toC. G.
Conn, Ltd., Elkhart, Ind., :av corporation of
Indiana
Applicationianuary 5, 1944, serial'No. 517,025 ' ~
7 Claims.
< oi. .zoo-_33)
l
2
This-invention relates to -interval control mech
anism and more particularly to switching mecha
nism for supplying an electrical impulse of ypre
determined duration.
One of the objects of the invention is to provide
vand attheir opposite ends pivoted to a blockv 23 -on
the base. These arms being parallel serve to
interval rcontrol mechanism in which the duration
of 'anl electrical impulse can be -accurately ad
-guide the carriage and hold it against rotation
while permitting it v'to move along the drum.
In operation-the drum is rotated >and the y'car
riage is moved along i't from initial position shown
in Figure '2 to a ?nal position shown in Figure 3.
In- the initial position the brush [39 engages the
conducting portion l5 of the drum, while the
micro second.
10 brush 20 engages the insulating portion I'4 at one
end> of the drum. Asïthe carriage is moved-axially
Another object is to provide interval control
§usted~. In the constructionyshown the »duration
of an impulse can be adjusted in fractions of a
mechanism in which duration of an impulse is
determined by »a pair of spaced brushes moving
over a contact drum.
Adjustment of the- inter
of the drum, the brush 2'6 will pass across >the
shoulder FIi on to the conducting portion l5 to
establish a circuit between the brushes. 'This cir
val is laccomplished in this construction by ad 15 cuit will be maintai-ned until the leading brush
19 movesacross the shoulder ll at the right end
vjusting the relative positions of the brushes to
of the drum to interrupt the circuit. Thus the
vary the time both brushes engage a conducting
interval duringÅ which the circuit is maintained
portion of the drum.
'
will depend upon the relativ-e positions of the
Still another object of the» invention is to pro
I
vide interval control mechanism in which safety 20 brushes.
In order to adjust the brush Z-U-to provide the
means are provided to prevent closing a circuit '
desiredV interva-l, the collar 2| is Aformed at one
between the brushes during resetting of the mech
end withscale markings having calibrations 24
anism.
thereon for one scale indication and calibr-ations
The above and other objects and advantages
will be more readily apparent from the following 25 25 for- a second scale indication. Preferably the
description when read in connection with the-ac
two scale indicationsv are in different Vcolors so
that they may be readily distinguished. One of
companying drawing, in which
the scale indications cooperates With a reference
Figure l is a plan lview of an intervalV control
mark 26 on the sleeve IB and the second scale
mechanism embodying the invention; and
Figures 2 and 3 are partial -diagrammatic views 30 indications cooperate with a similarV axially
spaced mark 21. The marks 26 and 21 may be
show-ing the mechanism in different positions.
4 The apparatus shown in Figure 1 comprises a
colored to correspond to the scales for easy read
ing. As the collaris turned indications are ?rst
base lo on which is mounted an electric motor
H. The motor is preferably a synchronous or
obtained on the scale 24 opposite the reference
constant speed motor of suf?cient power to drive
mark 26, the reference mark 21 at this time being
the apparatus without any substantial variation
spaced axially from the collar. As the collar is
inspeed during the cycle of operations. As shown,
turned-further it moves up on the reference mark
the motor may be controlledby a switch 12.
27 and the interval may then be read opposite
The motor shaft carries at its outer end a drum:
this mark on the scale 25. The scales are prefer
l-3 'as shown in Figures 2 and 3 formed with in 40. ably~calibrated in micro seconds so that the inter
val can 'be-adjusted accurately in fractions of a
sulatedl end portions vM and a conducting central
second.
portion |5. The several portions of the drum are
The carriage is moved along the drum by a
connected along helical lines l6 terminating in
feeding mechanism including a cylindrical feed
abrupt shoulders Il. While the drum has been
shown with the ends of insulating material- and 45 member-28 on the motor shaft having plain cy
lindrical end portions 28. with a helical thread
the centerV portion of conducting material, it will
29 therebetween. The pitch of the thread 29
be--understood- that this arrangement could be re
is the, same as that of the helical lines l6 so that
versed.
A- carriage is provided movable axially of the
as the carriage is> advanced the brushes will move
drum and as> shown in Figure 1 is formed/by a
parallel to the> lines 16.
.
sleeve IB ?tting over the drum. The sleeve car
The ycarriage has pivoted thereon a lever 3|
ries a pair of spaced brushes one indicated at 19
which carries at one end a follower pin 32 adapt
being fixed in the-sleeve and'the otherfshown at
ed tojengage the threads 29 to advance the car
riage. V'I'helever 3I-may be normally urged in va
20-being carried by a kcollar 21 which is threaded
position to engage the feed member by a spring
on the sleeve. The-threads connecting thercollar
2| -to the sleeve» are preferably of the same axial
orv thelike not shown and may bev moved out of
engagement withl the feed memberby al handle'
pitch as the helical lines l6.
~
~
The carriage is held against rotation while be
33V onA the end'ofth'elever. ' '
'
*
ing permitted to move axially of the drum by a
The carriage is shown in Figure 1 in its initial
pair of arms 22 pivoted to the carriage at one end 60 position in which the follower pin 32 engages the
2,4oa941
cylindrical portion 28 to the left of the threads
29. The carriage is urged toward the threads
by a spring 34 and is held in its initial position
against a spring tension by a latch 35. Prefer
ably, adjustable stops 36 and 31 are provided to
limit the initial and final positions of the carriage.
'I'o operate the mechanism with its carriage
in initial position as shown in Figure 1 and with
4
the carriage engageable with the feed screw to
move the carriage axially of the drum, a pair of
brushes on the carriage engageable With the
drum, a collar threaded on the carriage coaxial
with the drum Carrying one of the brushes, the
threaded connection between the collar and car
riage having the same axial pitch as the feed
screw and said helical lines.
4. Interval control mechanism comprising a
the motor I l running, the latch 35 is released.
The spring 34 then moves the carriage to the right 10 rotatable contact drum having adjacent con
until the follower pin 32 engages the threads 29.
ducting and insulating portions joined along
The carriage will continue to move at a rate de
helical lines, a carriage movable axially of the
termined by the threads to close a circuit be
drum, a feed screw rotatable with the drum
tween the brushes IS and 20 for a predetermined
having the same axial pitch as said helical lines,
interval as explained above. When the carriage
means of the carriage engageable with the feed
has moved over against the stop member 31 the
screw to move the carriage axially of the drum.
follower pin 32 will ride on 'the Cylindrical portion
a pair of brushes on the carriage engageable with
23 at the right of the feed member.
the drum, a collar threaded on the carriage
To reset the mechanism the lever 3| is swung
coaxial With the drum carrying one of the
clockwise to raise the follower pin 32 above the 20 brushes, the threaded connection between the
point where it will engage the threads 29. The
collar and carriage having the same axial pitch
carriage will then be moved to the left until the
as the feed screw and said helical lines, the
latch 35 is engaged at which time it is set for
collar having a pair of graduated scales at one
another operation.
end, and a pair of axially spaced index marks
In order to prevent accidental Completion of a
on the carriage cooperating with said scales
circuit between the brushes during resetting, a
respectively to indicate the interval during which
switch 38 is provided on the carriage in circuit
the brushes are electrically connected through
with the brushes. The switch 38 is normally
the drum.
closed but is engaged by the lever 3I when it is
5. Interval control mechanism Comprising a
operated to move the follower finger away from 30 contact drum having conducting and insulating
the feed member to be opened. Thus, during re
portions, a carriage movable axially of the drum,
setting it is impossible to establish a circuit
a pair of spaced Contacts carried by the carriage
through the brushes.
engageable with the drum, a feed screw aligned
While one embodiment of the invention has
with the drum, a follower movably mounted on
been shown and described in detail herein, it is 35 the carriage engageable With the feed screw to
understood that this is for the purpose of illus
move the carriage along the drum, and a switch
tration only and is not to be taken as de?nition
in circuit with the Contacts engaged and opened
of the scope of the invention, reference being
by the follower when it is moved out of engage
had to the appended claims for this purpose.
ment with the feed screw.
What is Claimed is:
40
6. Interval control mechanism comprising a
1. Interval control mechanism comprising a)
rotatable contact drum having adjacent con
ducting and insulating portions joined along
helical lines, a carriage movable axially of the
contact drum having conducting and insulating
portions, a carriage movable axially of the drum,
a pair of spaced Contacts carried by the car
riage engageable with the drum, a feed screw
drum. means to move the carriage at a substan 45 aligned with the drum, a lever pivoted on the
tially constant rate, a pair of spaced brushes on
carriage and carrying at one end a follower
the carriage engageable with the drum, and
engageable with the feed screw to move the
means mounting one of the brushes on the car
carriage along the drum, and a switch on the
riage for adjustment about the drum axis along
carriage in circuit with the Contacts engaged and
helical lines having the same axial pitch as the 50 opened by the lever When it is swung to a posi
first named helical lines to vary the helical dis
tion to disengage the follower from the feed
tance around the drum surface between the
screw.
brushes.
'7. Interval control mechanism comprising a
2. Interval control mechanism comprising a
shaft rotatable at a substantlally constant speed,
55
rotatable contact drum having adjacent con
a Contact drum on the shaft having Conducting
ducting and insulating portions joined along
helical lines, a carriage movable axially of the
and insulating portions joined by helical lines, a
carriage movable longitudinally of the drum,
drum, a feed screw rotatable with the drum
Contacts on the carriage engaging the drum, a
having the same axial pitch as said helical lines,
collar threaded on the carriage coaxial with the
means on the carriage engageable with the feed 60 drum on threads having the same axial pitch as
screw to move the carriage axially of the drum,
said helical lines and carrying one of the con
a pair of brushes on the carriage engageable with
tacts, a feed member on the shaft having cylin
the drum, and means mounting one of the
drical ends and a helical thread between them
brushes on the carriage for adjustment around
of the same axial pitch as said helical lines, a
the drum in a helical path having the same axial
follower pivotally mounted on the carriage
pitch as the feed screw and said helical lines.
movable into engagement with the feed member,
3. Interval control mechanism Comprisíng a
a switch in circuit with the Contacts opened by
rotatable contact drum having adjacent conduct
the follower when it is moved out of engagement
ing and insulating portions joined along helical
with the feed member, a latch for holding the
lines, a carriage movable axially of the drum, a 70 carriage in one end position, and resillient means
feed screw rotatable with the drum having the
same axial pitch as said helical lines, means on
urging the carriage toward its other end position.
-
EARLE L. KENT.
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