U.S. patent number 3,572,711 [Application Number 04/535,750] was granted by the patent office on 1971-03-30 for timer and lap counter for slot cars.
Invention is credited to Thomas H. Conklin, Donald D. Rice, Dimitri G. Theodorou.
United States Patent |
3,572,711 |
Conklin , et al. |
March 30, 1971 |
**Please see images for:
( Certificate of Correction ) ** |
TIMER AND LAP COUNTER FOR SLOT CARS
Abstract
A timer and lap counter for slot cars and the like consisting of
a switch disposed on the raceway on which the slot cars travel for
producing an electrical impulse on passage of a slot car. The
electrical impulses operate an electrical stepping switch which
starts an elapsed time timer and one or a plurality of lap timers
associated with each slot car. The stepping switch is also arranged
to turn on or off one of a plurality of visual indicators such as
lightbulbs for providing a visual display of the lap number
travelled by every individual slot car.
Inventors: |
Conklin; Thomas H. (Pontiac,
MI), Rice; Donald D. (Southfield, MI), Theodorou; Dimitri
G. (Oak Park, MI) |
Family
ID: |
24135603 |
Appl.
No.: |
04/535,750 |
Filed: |
March 21, 1966 |
Current U.S.
Class: |
463/59;
463/62 |
Current CPC
Class: |
A63H
18/005 (20130101) |
Current International
Class: |
A63H
18/00 (20060101); A63f 009/14 () |
Field of
Search: |
;273/86 (O)/ ;273/86
(2)/ ;273/86 ;104/60 ;340/323 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Oechsle; Anton O.
Claims
We claim:
1. A timer and lap counter for a slot car having guiding means
engaging a car guiding slot in a racetrack comprising: switch means
actuated by the guiding means of the slot car for producing an
electrical signal at each passage of said slot car at a
predetermined location of said racetrack, said switch means
comprising a fixed contact disposed at the bottom of the slot in
said racetrack, a flat springlike movable contact having an end
affixed to the bottom of the slot in said racetrack and another end
normally disengaged from said fixed contact and adapted to engage
said fixed contact when said guiding means engages said flat
springlike movable contact upon passage of said guiding means of
said slot car; an electrical stepping switch having a first and a
second movable contacts steppable by each said electrical signal in
engagement with respectively a first and a second pluralities of
consecutive stationary contacts; first timing means electrically
connected to said first plurality of stationary contacts for
measuring the total time taken by said slot car to run a race; at
least one second timing means electrically connected to at least
the first one of said second plurality of stationary contacts for
measuring the time taken by said slot car to run at least a first
lap on said racetrack; and consecutive numeral digit display means
each displayed upon successive advances of said stepping switch for
providing a visual indication of the lap number travelled by said
slot car.
2. The timer and lap counter of claim 1 wherein said first and
second timing means comprise an electric motor driven digital
counter giving a direct time readout.
3. The timer and lap counter of claim 1 wherein said numerical
digit display means comprises a plurality of incandescent light
bulbs providing an instantaneous visual numerical display of the
lap number travelled by said slot car.
4. The timer and lap counter of claim 1 wherein said numerical
digit display means comprises a face dial integral with said
stepping switch and a movable pointer displaceable to consecutive
numerical digits.
5. A timer and lap counter for a slot car having guiding means
engaging a car guiding slot in a racetrack comprising: switch means
actuated by the guiding means of the slot car for producing an
electrical signal at each passage of said slot car at a
predetermined location of said racetrack, said switch means
comprising a pair of flat spring spaced apart stationary contacts
disposed at the bottom of said slot and a current conductive
elongated member disposed at the bottom of the guiding means of
said slot car and adapted to be engageable simultaneously with both
said stationary contacts upon passage of said slot car thereover;
an electrical stepping switch having a first and a second movable
contacts steppable by each said electrical signal in engagement
with respectively a first and a second pluralities of consecutive
stationary contacts; first timing means electrically connected to
said first plurality of stationary contacts for measuring the total
time taken by said slot car to run a race; at least one second
timing means electrically connected to at least the first one of
said second plurality of stationary contacts for measuring the time
taken by said slot car to run at least a first lap on said
racetrack; and consecutive numeral digit display means each
displayed upon successive advances of said stepping switch for
providing a visual indication of the lap number by said slot
car.
6. The timer and lap counter of claim 5 wherein said first and
second timing means comprise an electric motor driven digital
counter giving a direct time readout.
7. The timer and lap counter of claim 5 wherein said numeral digit
display means comprises a plurality of incandescent light bulbs
providing an instantaneous visual numeral display of the lap number
travelled by said slot car.
8. The timer and lap counter of claim 5 wherein said numeral digit
display means comprises a face dial integral with said stepping
switch and a movable pointer displaceable to consecutive numerical
digits.
9. A timer and lap counter for a slot car having guiding means
engaging a car-guiding slot in a racetrack comprising: switch means
actuated by the guiding means of the slot car for producing an
electrical signal at each passage of said slot car at a
predetermined location of said racetrack, an electrical stepping
switch having a first and a second movable contacts steppable by
each said electrical signal in engagement with respectively a first
and a second pluralities of consecutive stationary contacts; first
timing means electrically connected to said first plurality of
stationary contacts for measuring the total time taken by said slot
car to run a race; at least one second timing means electrically
connected to at least the first one of said second plurality of
stationary contacts for measuring the time taken by said slot car
to run at least a first lap on said racetrack; and consecutive
numeral digit display means each displayed upon successive advances
of said stepping switch for providing a visual indication of the
lap number travelled by said slot car; wherein said switch means
comprises electromagnetic pickup means adapted to turn on a
normally off solid state switch, and relay means in the output
circuit of said solid state switch for closing an electrical
circuit for advancing said stepping switch movable contacts to each
consecutive contact of said first and second pluralities of
stationary contacts.
10. The timer and lap counter of claim 9 wherein said first and
second timing means comprise an electric motor driven digital
counter giving a direct time readout.
11. The timer and lap counter of claim 9 wherein said numerical
digit display means comprises a plurality of incandescent light
bulbs providing an instantaneous visual numerical display of the
lap number travelled by said slot car.
12. The timer and lap counter of claim 9 wherein said numerical
digit display means comprises a face dial integral with said
stepping switch and a movable pointer displaceable to consecutive
numerical digits.
Description
The present invention relates to timers and lap counters for slot
cars and the like and more particularly to means for providing a
visual display of the total number of laps traveled by a slot car
and the like and for providing timing means giving a visual display
of the time taken by the slot car to travel one lap as well as the
total elapsed time taken by the slot car to travel the total number
of laps traveled from the beginning of a race.
In recent years, electric motor driven miniature racing cars, often
called "slot" cars or racers, have become increasingly popular.
Generally such cars are provided with a pin or guide riding in a
slot so as to guide the car along a raceway and with electrical
pickup means sliding along electrical conductors imbedded in the
racetrack roadway and adapted to supply electrical power to the car
motor. The voltage applied to the car motor is under the control of
the car operator and the rate of speed at which the car travels
along the race track under the guidance of the slot is directly
controlled by the operator by varying the voltage applied to the
car motor. In this manner, the car may be started, speeded up,
slowed and stopped.
Slot car operators often engage in competitive races, either by
running their cars along the racetrack individually while the time
taken by the car to travel one or more laps is recorded by means of
stop watches, or the like, or by competitively racing several cars
against each other along parallel slots on a closed loop race track
having diverse curves and hills.
The present invention provides lap-counting means, giving an
instantaneous visual indication of the lap number being traveled at
a given time by a given car, combined with an elapsed timer
providing a visual display of the total time elapsed since the
beginning of a race, and in addition, the invention provides for
individual lap timers providing visual displays of the time taken
by each individual car for traveling each one of a predetermined
number of laps.
In view of the foregoing, it is a general object of the invention
to provide a substantially simple and low cost timer and lap
counter apparatus for slot cars.
It is another object of the invention to provide such timer and lap
counter apparatus with simple and effective signal producing means
providing an electrical signal upon the passage of a car on a
predetermined portion of the racetrack.
It is another object of the invention to provide a timer and lap
counter for slot cars giving at all times a visual indication of
the total laps traveled by each individual car together with a
visual display of the precise time taken by the car to travel each
one of a predetermined number of laps, while still providing a
further visual display of the total elapsed time taken by each car
to travel the total number of laps already traveled, said elapsed
time timer further providing a visual display of the total time
taken by each car to run a complete race.
Still a further object of the invention is to provide a timer and
lap counter for slot cars which is substantially inexpensive so as
to be available to slot car hobbyists, which is easy to maintain,
which is simple to manufacture and which is sufficiently precise
and adaptable so as to be of use to even the most advanced amateur
hobbyist or to the professional establishments where elaborate
roadways with a plurality of tracks are available, in consideration
of a small fee, to anyone who is interested in the slot car racing
hobby.
The foregoing as well as other objects and advantages of the
invention will be more clearly understood by reference to the
following detailed description taken in conjunction with the
accompanying drawings which represent by way of illustrations and
examples some of the embodiments of the invention.
In the drawings:
FIG. 1 is a simplified block diagram of an example of an embodiment
of a timer and lap counter according to the principles of the
invention;
FIG. 2 is a schematic representation of a simple switch for
providing an electrical signal upon passage of a car;
FIG. 3 is a partial cross-sectional view along line 3-3 of FIG.
2;
FIG. 4 is a partial view similar to FIG. 2, but showing the switch
in a closed position;
FIG. 5 is a schematic representation of another example of
switch;
FIG. 6 is a fractional view similar to FIG. 5, but showing the
switch being actuated upon passage of a car; and
FIG. 7 is another example of signal pickup according to the
principles of the invention.
Referring now to the drawings and more particularly to FIG. 1
thereof, a timer and lap counter apparatus for slot cars, according
to the principles of the present invention, comprises an electrical
power supply 10, which may be direct current power supply normally
used for supplying a direct current voltage to the slot car motors,
or which may simply be a source of 110 volt, 60 cycles, voltage.
The power supply has a terminal 12 connected to a line 14 which is
in turn connectable to a line 16 when switch 18 is depressed or
actuated. Line 16 is connected to the inductor, schematically
represented at 20, of a stepping switch 22. The return circuit has
arbitrarily been chosen to be represented by the ground return, one
end of the inductor 20 of the stepping switch 22 being connected to
ground and the other terminal 24 of the power supply 10 being also
connected to ground. The power supply 10 is provided with a third
terminal or tap 26 connected to a line 28 which may be in turn
connected to a line 30 when a switch 32 is closed. The stepping
switch 22 is provided with two contact wafers shown schematically
respectively at 34 and 36. Each wafer is provided with a plurality
of regularly disposed fixed contacts, identified I--X with respect
to wafer 34 and I'--X' with respect to wafer 36. Wafer 34 has a
movable contact 38 and wafer 36 has a movable contact 40 which are
displaceable in unison, upon stepping of the switch 22 in the
direction of the arrows so as to engage consecutively respectively
fixed contacts I--X and I'--X'. Wafer 34 is provided with an input
terminal 42 connected to line 30 by means of line 44, and contact
wafer 36 has an input terminal 46 connected to line 30. Out put
terminals of contacts I--III of wafer 34 are connected in parallel
to a common line 48 which is in turn connnected to a counter
electric motor 50 adapted to drive a lapsed time visual display 52.
The terminals of contacts IV--X are connected in parallel by way of
a line 54 to line 48 through a switch 56.
In the example of the invention as shown, the terminal of
stationary contact I' of contact wafer 36 is connected by way of a
line 58 to an incandescent lamp 60. Disposed in parallel with lamp
60 is a counter motor 62 adapted to drive lap timer No. 1 shown at
64, a switch 66 being placed between motor 62 and line 58. In a
similar manner, the terminal of stationary contact II' is
connected, via line 68, to an incandescent lamp 70, a counter motor
72 adapted to drive lap timer counter No. 2, identified by numeral
74, being placed in parallel with the incandescent lamp and being
connectable to line 68 by means of switch 76. The terminal of
stationary contact III' is also shown connected through a line 78
to a lamp 80, a counter motor 82 adapted to drive lap timer No. 3,
84, being placed in parallel with the lamp and being connectable to
line 78 via a switch 86. Each one of the terminals of stationary
contacts IV'--X' is shown in the drawing as being connected to each
of the incandescent lamps 88--100, the current return to ground
being effected through a switch 102. It is evident that each of
such terminals could also be connected to individual lap timers
disposed in parallel with the lamps 88--100. It is obvious that any
number of lap timers could thus be provided and that a stepping
switch having more than 10 stationary contacts engageable by a
movable contact could be used so as to provide any possible
practical number of lap counting means and lap timing means. It is
also obvious that several stepping switches could be interconnected
in the "Christmas Tree" fashion familiar to those skilled in the
computer and telephone arts.
One apparatus according to the example of the invention of the
schematic of FIG. 1 is adapted to cooperate with each tracks of a
slot raceway, and previously to the start of a race, switch 32 of
each apparatus connected to a track being utilized by a slot car is
closed. Switches 66, 76 and 86 would be normally closed and
switches 56 and 102 would also be normally closed unless it is
desired to run only a three lap race, in which event switches 56
and 102 would be left open to stop the operation of the apparatus
at the end of the third lap.
In operation, switch 18, disposed at the starting line of the track
roadway, is closed by the passage of a slot car, thus producing an
electrical impulse across the inductor 20 of the stepping switch
22. This electrical impulse causes the rotor of the stepping
switch, arbitrarily represented in the drawing at 21, to actuate
the moveable contacts 38 and 40 of switch wafers 34 and 36
respectively from the off position shown in the drawing to the next
position wherein the contacts engage respectively contact I of
wafer 34 and contact I' of wafer 36. As switch 32 has been closed
previously to the starting of the car run, terminal 26 of the power
supply is now connected to line 30 and to terminal 42 of switch
wafer 34 and to terminal 46 of switch wafer 36. As terminals 42 and
46 are respectively electrically connected to movable contact 38
and 40, which are now engaging contacts I and I', elapse timer
motor 50 is started and lap timer No. 1, 64, is also started by its
motor 62 starting to run. Light bulb 60, in parallel with light lap
timer No. 1 shines and displays numeral I, thus indicating that the
car is running lap No. 1.
After the car has traveled the first lap, upon passage again at the
starting line of the race track, switch 18 is again actuated thus
advancing movable contact 38 of switch wafer 34 from position I to
position II, and simultaneously advancing movable contact 40 of
switch wafer 36 from position I' to position II'. Motor 50 of
elapsed timer 52 continues to run, but motor 62 of lap timer No. 1,
64, is turned off, and bulb 60 is also turned off, while
simultaneously motor 72 of lap timer No. 2, 74, is started and
light bulb 70 is turned on, thus displaying digit 2 indicating that
the car is traveling its second lap around the track. The time
displayed by lap timer No. 1, 64, is the time that it took the car
to travel its first lap around the racetrack.
The third passage of the car over the starting line, by again
actuating switch 18, steps stepping switch 22 once again in the
same manner as previously explained, thus stopping lap timer No. 2,
74, and starting lap timer No. 3, 84, at the same time that bulb 70
is turned off and bulb 80 is turned on, thus indicating that the
car is traveling its third lap. Elapsed timer 52 continues to run.
If switches 56 and 102 are open in the event that the race is a
three-lap race, at the end of the race, elapsed timer 52 is stopped
upon movable contact 38 being stepped to position IV, an the time
displayed by elapsed timer 52 is the elapsed time that it took the
car to travel the three laps. Lap timer No. 3, 78, also stops when
movable contact 40 is stepped from position III' to position IV' so
that lap timer No. 's 1, 2, and 3 display respectively the time
that it took the car to travel the first lap, the second lap and
the third lap.
If it is desired to run a race longer than three laps, switches 56
and 102 are closed, previously to the start of the race, and upon
each successive passage of the car at the starting line, switch 18
is actuated. The stepping switch 22 is advanced each time that
switch 18 is actuated such as to cause movable contact 38 of wafer
34 and movable contact 40 of wafer 46 to be stepped to their next
consecutive position so as to engage the next consecutive
stationary contact. In this manner, elapsed timer 52 continues to
record the total elapsed time until the end of the race, and bulbs
88 and 100 are consecutively lit and extinguished, thus displaying
at any given moment an indication of the lap number being traveled
by the car. At the end of the race, lap timers No. 1 to No. 3
display only the lap times corresponding to the running of the
first, second and third laps of the race.
It is evident that lap timers may be connected to the terminals of
stationary contacts IV' to X' of stepping switch wafer 36 in the
same manner as shown in the drawing relatively to the connections
of stationary contacts I', II', and III'. When such an arrangement
is adopted, it is evident that the end of the race, assumed herein
to be a 10-lap race, elapsed timer 52 indicates the total elapsed
time it took the car to travel the entire race, while every
individual lap timer displays the running time corresponding to
each lap.
Although the example of the invention of FIG. 1 has been shown to
include digit displaying incandescent lamps 60, 70, 80 and 88--100
for producing a visual indication of the lap number being run by an
individual car, other means may be used and are contemplated by the
present invention. For example, the incandescent lamps may be
omitted and a stepping switch may be used which comprises a dial
substantially as shown in the drawing with consecutive numbers,
such as numbers I to X, actually engraved or printed upon the dial
face which is structurally part of the switch wafer such as wafer
36. Movable contact 38 is physically supported by an arm member,
such as shown at 39, forming a pointer which is consecutively
indexed relatively to each consecutive fixed contact corresponding
to laps I to X. Consequently, the stepping switch 22 itself may be
used to provide a visual lap counter display.
Referring now to FIGS. 2--4 there is shown in a schematic manner, a
portion of a slotted roadway 102 provided with a longitudinal slot
104 having a bottom 106. On the bottom 106 of the slot is placed a
switch, designated generally at 18, provided with a fixed contact
108 and a movable contact 110, normally a small distance away from
each other, as shown in FIG. 2. Movable contact 110 is formed on
the end of a elongated substantially U-shaped flat spring member
112, the other end of which is affixed to the bottom 108 of slot
104 by any conventional means. One terminal of the switch is
connected to line 14 and the other terminal is connected to line 16
of FIG. 1.
A slot car or racer 114 adapted to run on the roadway 102, guided
by the slot 104, has a chassis frame, such as shown at 116, on
which is affixed a body, such as shown at 118. Chassis 116 supports
the road wheels of the car, the front wheels 120 being normally
free running and the rear wheels, not shown, being normally driven
by an electric motor, now shown. On the front of chassis frame 116
is pivotably mounted so as to be capable of rotating around an axis
substantially perpendicular to the plane of the roadway 102, a
combination guide and electric current pickup 122 according to now
well-known principles in the art. Guide 122 has a vertical blade
portion 124 normally disposed within slot 104 so as to guide car
114 along the racetrack. Guide 122 is also provided with a
horizontal blade portion 126. Below the horizontal blade portion
126 are disposed current pickup braids 128 and 130 for riding along
electrical conductors 132 and 134 imbedded in the roadway. The
pickup braids 128 and 130 are respectively connected to wires 136
and 138 which supply electrical power to the car motor, not shown.
Guide 122 is provided with a vertical pin 140 engaged in an
appropriate vertically disposed bore 142 arranged in the front end
of the chassis frame 116. In some types of slot car racers, a
single fixed pin affixed to the front of the car and engaging the
slot is used instead of the guide shown in FIGS. 2--3, but even
where such a construction is adopted, the principle of operation of
switch 18 remains the same as presently explained.
When car 114 passes over switch 18, the bottom of vertical guide
blade 124 engages the top of the flat spring portion 112 of switch
18, as shown in FIG. 4, and thus causes contact 110 to engage
contact 108, thus closing the electrical circuit between line 14
and 16.
FIGS. 5--6 represent a modification of the switch arrangement of
FIGS. 2--4. In this modification, switch 18 includes a pair of flat
spring contacts, as shown at 140 and 142, respectively connected to
lines 14 and 16 of FIG. 1, and attached to the bottom of slot 104.
Each flat spring contact 140 and 142 has a substantially horizontal
portion, as shown respectively at 144 and 146, which nevertheless,
forms a slight angle with the plane of the bottom surface 106 of
the slot 104. The bottom of the vertical blade portion 124 of guide
122 of car 114, is provided with an elongated electrical current
conductive section 148. When the car 114 passes over the switch 18,
as shown in FIG. 6, the current conductive elongated section 148
disposed at the bottom of the guide vertical blade 124 engages the
upper faces of the substantially horizontal portions 144 and 146 of
respectively resilient contacts 140 and 142, urging them slightly
downward and thus closing the electrical circuit between line 14
and line 16.
FIG. 7 represents a modification of switch 18 given for
illustrative purpose to show that switch 17 may be constructed such
as not to depend upon being actuated by means of the guide pin or
guide blade of a slot car. In this example of an embodiment of
switch 18 comprises an electromagnetic pickup transducer 150
comprising a core 152 made of material such as ferrite around which
is wound a coil 154. Coil 154 is placed in the base circuit of an
NPN transistor 156, the base 158 of which is connnected to one end
of coil 154 through diode 160 and to ground through a bias resistor
162 having a capacitor 164 in parallel therewith. The emitter 168
of transistor 156 is directly connected to ground and forms with
the collector 170 of the transistor a series circuit including the
coil 172 of a relay 174 and a direct current supply 176 having a
grounded negative terminal. A diode 178 shunts the coil 172 of
relay 174. Relay 174 comprises a normally open switch 178 placed in
a circuit connecting one terminal of a power supply to the inductor
20 of the stepping switch 22 of FIG. 1.
In view of the slightly negative bias applied to the base 158 of
transistor 156 due to the presence of resistor 162 in the base
circuit of the transistor, the collector 170-emitter 168 circuit
thereof is normally in an off condition. An electrical signal
induced through coil 154 of electromagnetic pickup transducer 150
is caused by the passage of car 114 in the proximity thereof, a
variable magnetic flux being induced through core 152 from the
permanent magnets of motor 180 adapted to drive the rear wheels,
such as 182, of the car. The electrical signal induced in coil 154
is rectified through diode 160 and applies to the base 158 of
transistor 156 a positive bias that renders the collector
170-emitter 168 circuit thereof conductive, as a result of the
current flow through diode 160 charging the capacitor 164 so that
the plate thereof connected to the base 158 of transistor 156 is at
a positive potential. The current flow in the collector-emitter
circuit of the transistor 156 through coil 172 of relay 174
actuates switch 178 to a closed position, thus causing the rotor 21
of stepping switch 22 to be rotated and to step the switch movable
contacts to a next consecutive position as hereinbefore explained.
Diode 178 shunting the coil 172 of relay 174 prevents large
transient voltages which could be damaging to the transistor 156
from being applied across the collector 170-emitter 168 terminals
thereof.
It is evident that the herein described and illustrated embodiments
are only a few examples of possible arrangements according to the
principles of the invention, for a timer and lap counter apparatus
for slot cars such as are used in slot car race tracks, and that
many changes, additions and modifications will become apparent to
those skilled in the art without departing from the spirit and
scope of the present invention as enunciated in the appended
claims. Is is also evident that the principles of the invention are
also applicable to arts other than the slot car racing art and may
be incorporated in other types of competitive games such as
miniature horse races and the like.
* * * * *