U.S. patent number 3,745,930 [Application Number 05/150,820] was granted by the patent office on 1973-07-17 for automatic hole finder for spike driver.
Invention is credited to Andrew M. Dieringer.
United States Patent |
3,745,930 |
Dieringer |
July 17, 1973 |
AUTOMATIC HOLE FINDER FOR SPIKE DRIVER
Abstract
This is a method and apparatus for finding the hole in a tie
plate by the use of reflected light and automatically driving the
spike through the hole to secure the rail and tie plate to the tie
so that operator error in spiking railroad track is eliminated.
Inventors: |
Dieringer; Andrew M.
(Waterford, WI) |
Family
ID: |
22536118 |
Appl.
No.: |
05/150,820 |
Filed: |
June 7, 1971 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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805780 |
Mar 10, 1969 |
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Current U.S.
Class: |
104/17.1;
250/234 |
Current CPC
Class: |
E01B
35/00 (20130101); B23P 19/10 (20130101); E01B
29/26 (20130101); E01B 2203/16 (20130101) |
Current International
Class: |
B23P
19/00 (20060101); E01B 29/00 (20060101); E01B
29/26 (20060101); E01B 35/00 (20060101); E01b
029/26 () |
Field of
Search: |
;104/17R
;250/223,152,172,234 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Forlenza; Gerald M.
Assistant Examiner: Bertsch; Richard A.
Parent Case Text
This is a continuation of application, Ser. No. 805,780, filed Mar.
10, 1969, now abandoned.
Claims
I claim:
1. A method of doing work in a hole in a work piece having an
exposed surface, including the steps of positioning a working
instrument in working relation to the exposed surface, directing a
light beam at the exposed surface at an angle that will produce a
shadow in the hole, sensing the light reflected from the exposed
surface, adjusting the intensity of the light beam so that the
light reflected from the exposed surface will always be at the same
level of intensity regardless of changes in the reflectivity of the
exposed surface, independently sensing the reduction in the
reflected light caused by the shadow in the hole, and energizing
the working instrument in response to the reduction in the
reflected light caused by the hole to do work in the hole.
2. A method of driving a spike into a hole in a tie plate and into
a tie, including the steps of positioning a spike in working
relation to the top of the tie plate, directing a light beam at the
top of the tie plate at an angle that will produce a shadow in the
hole, sensing the light reflected from a limited area on the top of
the tie plate, aligning the spike with and above the limited area
of the tie plate, traversing the spike, the limited area, and the
sensing step above the tie plate in a generally horizontal
direction, detecting the reduction in the light reflected from the
top of the tie plate caused by the shadow in the hole, stopping the
horizontal movement of the spike over the hole in the tie plate in
response to a reduction in the reflected light caused by the shadow
in the hole, and driving the spike downwardly through the hole in
the tie plate and into the tie.
3. The method of claim 2 further characterized by and including the
steps of gauging the distance of the spike from the head of the
rail, and traversing the spike above the tie plate in a generally
horizontal direction at the gauged distance from the rail.
4. The method of claim 2 further characterized by and including the
steps of separately sensing the light reflected from the top of the
tie plate in an area adjacent the limited area, and adjusting the
intensity of the light beam in response to the separate sensing
step so that the light reflected from the top of the tie plate will
always be at the same level of intensity regardless of changes in
the reflectivity of the top of the tie plate.
5. The method of claim 2 further characterized by and including the
step of simultaneously driving a second spike in a second hole in
the tie plate by moving the second spike through the various steps
at a gauged distance from the first spike corresponding to the
distance between the holes in the tie plate so that the second
spike will automatically be aligned with and driven into the second
hole.
6. The method of claim 2 further characterized in that the step of
driving the spike downwardly through the hole in the tie plate is
automatically initiated in response to the detection of the shadow
in the hole.
7. In a device for doing work in a hole in a work piece having an
exposed surface, a working instrument positioned in working
relation to the exposed surface of the work piece, means for
directing a light beam at the exposed surface at an angle that will
produce a shadow in the hole, sensing means for sensing the light
reflected from the exposed surface, adjusting means responsive to
the sensing means for adjusting the intensity of the light beam so
that the light reflected from the exposed surface will always be at
the same level of intensity regardless of changes in the
reflectivity of the exposed surface, and a second sensing means for
independently sensing the reduction in the reflected light caused
by the shadow in the hole for energizing the working instrument and
causing it to do work in the hole.
8. In a device for driving railroad spikes into the holes in tie
plates in railroad tracks, a spike driving mechanism disposed for
generally vertical movement aligned with a certain position, means
for directing a light beam at an angle to the top of the tie plate
that will produce a shadow in the hole in the tie plate, sensing
means aligned generally with the said certain position for sensing
the light reflected from the top of the tie plate at the said
certain position, and means responsive to the reduction in the
light reflected from the said certain position on the top of the
tie plate caused by the shadow in the hole for energizing the spike
driving mechanism to drive a spike into the hole in the tie plate
and into the tie.
9. The structure of claim 8 further characterized by and including
a second sensing means aligned with a second position on the top of
the tie plate adjacent the said certain position for detecting the
light reflected therefrom, and means responsive to the second
sensing means for adjusting the intensity of the light beam so that
the light reflected from the surface of the tie plate will always
be at the same level of intensity regardless of changes in the
reflectivity of the top of the tie plate.
10. The structure of claim 8 further characterized by and including
traversing means for moving the spike driving mechanism and the
sensing means over the tie plate in a scanning motion, and means
for automatically de-energizing the traversing means when the
sensing means detects a reduction in the reflected light due to the
shadow in the hole in the tie plate, and for automatically
energizing the spike driving mechanism at the same time.
11. The structure of claim 10 further characterized by and
including means for automatically retracting the spike driving
mechanism when a predetermined spike driving pressure has been
reached.
12. In a device for driving spikes into the holes in tie plates and
into the ties in railroad track, a frame movable along a railroad
track, a carriage movably mounted on the frame between a withdrawn
position and an extended position so that it may perform a
generally horizontal scanning motion, a power operated spike driver
on the frame constructed to perform a generally vertical
up-and-down spike driving motion along a defined path, a light
source on the frame directed at an angle to the top of the tie
plates so that it will create a decided shadow in the tie plate
holes, a sensing mechanism on the carriage directed at the location
where the defined path of the spike driver will intersect the top
of the tie plate and mounted on the carriage so that it will
perform the scanning step therewith, carriage power means for
moving the carriage and sensing mechanism through their scanning
motion, and automatic means for energizing the spike driver
responsive to the sensing mechanism detecting a shadow in the tie
plate hole and, at the same time, for de-energizing the carriage
power means so that sensing will stop.
13. The structure of claim 12 further characterized in that the
light source is mounted on the carriage and is movable therewith
during scanning.
Description
This invention is in the field of spike driving machines for
driving spikes into the ties in railroad track and is specifically
concerned with a method and apparatus for automatically finding the
hole in the tie plate, positioning the spike over the hole, and
driving the spike through the hole in the tie plate and into the
tie, all on an automatic basis.
A primary object of the invention is a method and apparatus for
automatically finding the hole in the tie plate and driving the
spike through it.
Another object is a method and apparatus of the above type which
eliminates operator error.
Another object is a method and apparatus of the above type which
leaves a minimum to the operator's discretion or judgment.
Another object is a hole finding method and apparatus which insures
that the spike will be accurately driven.
Another object is a hole finder which uses reflected light as the
searching or scanning media.
Another object is a hole finding method which is self-compensating
so that variations and changes in the reflectivity of the surface
being worked upon will be factored out.
Another object is a method and apparatus which automatically finds
the hole in a tie plate and drives the spike much more rapidly and
accurately than anything heretofore.
Other objects will appear from time to time in the ensuing
specification and drawings in which:
FIG. 1 is a schematic of a spike driving mechanism with a reflected
light apparatus;
FIG. 2 A is a portion of the electrical circuit; and
FIG. 2 B is another portion of the electrical circuit.
In FIG. 1, a spike driving mechanism has been indicated
schematically at 10 above a railroad track 12 where a rail 14 is
supported on a tie plate 16 which in turn rests on a tie 18. In
FIG. 1, the side of the rail and the end of the tie are shown so
that the view may be considered to be taken transversely of the
general direction of the track.
The details of the spike driving mechanism itself are not shown,
but it probably would include the usual wheeled framework, either
self-propelled or pushed, with a load of spikes and a power
mechanism for driving the spikes into the tie. A cylinder 20, be it
hydraulic, air operated or otherwise, is shown diagrammatically in
FIG. 1 which is intended to represent any power mechanism for
driving spikes. In the diagrammatic form shown, the cylinder is
mounted on a framework 22 of any suitable type which in turn
carries jaws 24, shown as pivoted, to releasably hold a
conventional spike 26. The mechanism may have a movable carriage
mounted on the vehicle and constructed to be moved by any suitable
power mechanism, such as a hydraulic cylinder 28, which may be
assumed to move the carriage along with the spike driving mechanism
10 longitudinally of the rails. While the power source 28 for
moving the carriage has been shown diagrammatically and not
connected to the spiking carriage, it should be understood that 28
is intended to represent any suitable power mechanism for swinging,
sliding or otherwise positioning some sort of a carriage spiking
mechanism the details of which in and of themselves are
unimportant. For a typical example of a conventional spike driver,
see U.S. Pat. No. 3,426,698, issued Feb. 11, 1969, and assigned to
the assignee of the present application.
A light source 30 of any suitable type has been shown mounted on
the carriage so that it moves with it. The general direction of the
light from the source is at a decided angle to the upper surface 32
of the tie plate. A sensing mechanism 34 is mounted on the carriage
which includes a light control sensor 36 and a trigger sensor 38.
As explained hereinafter, the light control sensor 36 "sees" a
substantial area 40 of the reflecting surface of the tie plate and
is set for a certain luminosity. If the condition of the reflected
surface is such that the luminosity received by the light control
sensor 36 varies from the predetermined setting, the light control
sensor will turn the light 30 either up or down, i.e., modulates it
so that the light reflected from the top of the tie plate will
always be at the same level of intensity or luminosity. Various
factors can cause the reflected light to vary, for example the tie
plate may be new, old, rusty, wet or otherwise. The spike driver
may be operating on a clear day or it may be overcast. The bulb in
source 30 may be old or otherwise. The lamp or lense may be dusty.
The point is that the sensor 36 "wants" a certain level of
luminosity and it functions to turn the light 30 up or down until
it gets what it wants.
The reason for this is so that the trigger sensor 38 will always
receive the same level of luminosity regardless of any of the above
factors. The trigger sensor is directed toward a more or less
confined area 42. The spike and its driving gun are aligned
generally with the spot 42 that the trigger sensor responds to. The
mechanism is calibrated so that a certain drop in the luminosity
received by the trigger sensor 38, i.e., the shadow 44 in a hole 46
in the tie plate, will cause the heretofore described mechanism to
stop the transverse of the carriage and drive the spike 26 into the
spike hole in the tie plate and into the tie.
In FIGS. 2A and 2B, a circuit has been shown which includes a
suitable power source 48 connected to a power "on" button Sw-1 with
contacts 50, 52 and 54, all in a control box indicated generally by
the dotted line 56. The operator presses control button SW-1
momentarily and releases it, which is sufficient to put current
through the holding relay 58 which holds contacts 50 and 52 closed
and contacts 54 in the lower position. The holding solenoid may be
released by a "stop" button 55. Closing of the lower contacts 54
energizes line 60, connection 60, 62, line 64, light control sensor
36 (FIG. 2B), trigger sensor 38, light control circuit 66 (FIG. 2A)
through connection 68. At the same time, the light source 30 is
energized through connection 70, and connection 72 which runs to
the other side of the light control circuit 66. The trigger sensor
38 is also connected by a lead 74 to a trigger circuit 76 which is
energized when the power button SW-1 is momentarily depressed by
the operator. Closing of the top contacts 50 of SW-1 also energizes
a relay K-2 through a line 78 which closes contacts 80, 82 and the
lower contacts of 84. The lower contacts 80 lead to a ram limit
switch SW-3 with contacts 86 through a lead 88, which in turn is
connected to a "ram up" solenoid 90 through lead 92 with the "ram
up" solenoid 90 controlling hydraulic fluid to the ram 20 to raise
it. When relay K-2 is energized, the upper contacts of 84 open,
which opens a line 94 to a "drive" solenoid 96 for the ram. When
the "drive" solenoid 96 is energized, it will reverse the solenoid
valve controlling the hydraulic fluid to the ram 20 so that the ram
will be lowered to drive a spike. Thus the "drive" solenoid 96
lowers the ram to drive a spike while the "ram up" solenoid raises
the ram or spike gun. Depressing the "on" button SW-1 closes relay
K-2 which energizes "ram up" solenoid 90 to raise the ram, if it is
not already raised, and deenergizes the ram "drive" solenoid
96.
Carriage 22 has a limit switch SW-4 (FIG. 2B) with contacts 98
which connect to the middle contacts 82 of relay K-2 through a line
100 with the other side of SW-4 contacts 98 being connected to a
"carriage-back" solenoid 102 through a line 104. A carriage forward
solenoid 106 is connected by a lead 108 to the upper contacts 110
of a relay K-1, the lower contacts being designated 112.
When the power "on" button SW-1 is initially depressed, the
traversing carriage 22 should be fully retracted, either left or
right in FIG. 1, and the spike driving ram or gun 20 should be all
the way up. If the carriage 22 is not fully withdrawn, contacts 98
of the carriage limit switch SW-4 will be closed which will
energize the "carriage back" solenoid 102 which in turn will
operate a suitable valve to energize the carriage traversing
mechanism 28 which will return the carriage to its fully retracted
position. When the carriage reaches its fully retracted position,
contacts 98 of limit switch SW-4 will open and opposing contacts
114 will close, which is the position shown in FIG. 2B.
The same is true of the spike driving mechanism or ram 20. If it is
not in its fully raised position, the contacts 86 of the ram limit
switch SW-3 will be closed which will energize the "ram up"
solenoid 90. This in turn will control the ram actuating mechanism
20 to raise the ram. When the ram is all the way up, contacts 86 of
limit switch SW-3 will open and the opposing contacts 116 will
close, which is the position shown in FIG. 2B. Contacts 116 of SW-3
and 114 of SW-4 are in series by a lead 118 with the other side of
contacts 114 being connected by a lead 120 to the middle contacts
112 of relay K-1 (FIG. 2A).
If the ram is not fully retracted and if the carriage is not fully
withdrawn, or both, the mechanism cannot be energized by the light
arrangement. The first thing that will happen, when the "on" power
button SW-1 is depressed by the operator, is that the carriage will
move to its fully retracted position and the ram will move to its
fully raised position if they are not already there.
The machine is now ready to cycle. The operator depresses
momentarily a cycle actuation button SW-2 (FIG. 2A) which is
connected through a lead 122 to contacts 116 of limit switch SW-3
and contacts 114 of limit switch SW-4. If either or both of these
contacts are open when the operator depresses the cycle actuation
button SW-2, nothing will happen.
The light control sensor 36 automatically turns the light 30 either
up or down through the light control circuit 66 until the exact
amount of luminosity, as called for by the light control circuit
66, is received by the light control sensor 36. It will be recalled
that whatever that luminosity setting is, the trigger sensor 38
will be receiving it. When the light control sensor "sees" the
proper amount of light, it will energize the base of transistor 123
in the trigger circuit through line 64 which in turn energizes
relay K-1 closing contacts 110 and the lower contacts of 112. The
closing of contacts 110 energizes the "carriage forward" solenoid
106 through line 108. This starts the carriage traversing, for
example in the direction of the arrow in FIG. 1. The confined
luminous spot 42 detected by the trigger sensor 38 then may be
assumed to be moving from left to right in FIG. 1. As soon as the
luminosity of spot 42 drops due to the shadow 44 in the spike hole
46 in the tie plate, this puts more resistance in series with the
trigger circuit 76, which deenergizes transistor 123 opening up
relay K-1 and breaking contacts 110 and the lower contacts of 112.
Note that this closes the upper set of contacts of 112 which
energizes the ram "drive" solenoid 96 through line 94 and the upper
contacts of 84. The ram or gun 20 (FIG. 1) lowers the spike 26 into
the tie plate hole 46 and drives it into the tie 18. A pressure
limit switch 126 is arranged to react to a certain pressure
build-up in the ram, for example 2,000 psi. When the pressure in
the ram reaches whatever point is selected, switch 126 closes. The
pressure limit switch contacts are connected by a lead 128 to the
upper contacts of 112 of relay K-1 and a second lead 130 which
energizes relay K-2 pulling all of the contacts 80, 82 and 84 down
and breaking the upper contacts of 84 which deenergizes line 94 and
drive solenoid 96. Since the carriage is not in its fully retracted
position, as is the ram, contacts 116 and 114 of limit switches
SW-3 and SW-4 are open. The closing of contacts 80 and 82 when
relay K-2 is energized energizes the "carriage back" solenoid 102
through contacts 98 of limit switch SW-4 (which are closed) and the
"ram up" solenoid 90 through contacts 86 of limit switch SW-3
(which are closed). Thus the closing of contacts 126 by the build
up of pressure in the ram driving system, at whatever point is
selected in pressure build-up, automatically energizes the ram
raising and carriage retracting mechanisms. And the sequence of
operations is ready to start over again. The unit may have a manual
carriage traversing button 127, if desired.
In FIG. 1, the spike being driven into the tie plate hole and tie
may be considered to be either between the rails or outboard.
Longitudinal movement of the carriage and spike is adjusted, lined
up and fixed with the flange on the wheel of the spike driving
vehicle being gauged laterally to the position of the spike hole
which is sufficiently accurate. If there is any minor lateral
misalignment, the bottom of the spike is pointed or chiseled, as
indicated at 131, in a longitudinal direction so that the spike
will automatically cam through the minor misalignment and will
enter the tie plate hole properly. Thus carriage movement to find
the tie plate hole and drive the spike is basically in a
longitudinal direction which may be considered generally parallel
to the track. Since the holes in a tie plate are accurately spaced,
a similar carriage might work the other side of a rail with the
gauging being set between carriages. One reflected light system,
either inside or outside, could fine one tie plate hole and two
spikes could be driven simultaneously with the gauge of the tie
plate holes being automatically fixed in the spacing of the driving
guns 20.
Or you might have the inside and outside carriage completely
independent of each other with each having its own reflected light
system and operating totally independently, a connection for the
other being shown at 132 in FIG. 2A.
Whereas only one axis traversing has been shown, it should be
understood that two-axis traversing could be used, if desired, in
which case the light and sensors might be disposed at more or less
a 45.degree. angle to the track and to the tie plate holes to
establish a rectangular shadow in the hole. But it is preferred
that the carriage be gauged to the rail head and fixed and that all
scanning be in one direction or along one axis only.
The use, operation and function of the invention are as
follows:
A reflected light system is used to sense, detect and pick up the
holes in a working surface, shown in this case as tie plate holes
in a tie plate so that a spike or any other suitable working
instrument may be automatically positioned relative to the hole and
then work performed. This takes the form of driving a spike into
the hole, but it might be a drill to drill a hole in the tie. I
have referred to a spike as being driven, but it might also be a
positioning pin or dowl. Whether the working instrument is a spike
which is driven or a drill, reamer, tap or what have you, the point
is that light is projected toward the working surface at a decided
angle so that a shadow will be created in the hole. A light sensor
is disposed to pick up the reflected light from the working surface
and where the luminosity drops due to the shadow produced in the
hole, the light sensor will feed back a control to the working
mechanism and perform a working operation in response thereto.
An important aspect of the invention is the light control sensor
which "observers" a defined area of the luminated surface and is
set for a certain level of reflected light. If it doesn't "see"
that level, it automatically turns the light up or down until the
desired level of reflected light is obtained. Thus the sensor unit
which is preferably adjacent to the level sensor will always be
receiving the same level or intensity of reflected light from the
working surface, in this case the top of the tie plate. The sensor
can in turn be set at the selected level of reflected light and as
soon as the received luminosity drops due to the shadow in the
hole, the sensor energizes or deenergizes the various mechanisms
described previously.
When used in the railroad field, specifically on a spike driver,
the invention has the advantage that the operator of the spike
driver merely positions his machine roughly over the tie plate and
then depresses the cycle actuated button, in this case SW-2, which
starts the traversing or scanning movement. The operator then no
longer controls the sequence of steps and the reflected light
system takes over. The system automatically finds the hole, stops
the scanning movement, initiates the spike driving gun, pushes the
spike down to a predetermined level, stops, automatically retracts,
retraverses the carriage back to the starting point and is ready
for another cycle. The operator cannot influence or affect the
scanning and spike driving and the system automatically insures
that the hole is found and the spike is properly driven. This
greatly reduces or completely eliminates bent spikes which have
been a never-ending source of expense and troubles.
While the preferred form of the invention has been shown and
described and several variations have been suggested, it should be
understood that numerous additional modifications, substitutions,
changes and alterations may be made without departing from the
invention's fundamental theme.
* * * * *