Security guard recording system

• US 3,959,633 A
• Filed: 09/10/1974
• Issued: 05/25/1976
• Est. Priority Date: 09/10/1974
• Status: Expired due to Term

• Current Assignee: Merck & Co., Inc.
• Original Assignee: Merck & Co., Inc.
• Inventors: Lawrence, William Grove, Sauter, Wolfgang Juergen
• Primary Examiner(s): Boudreau, Leo H.
• Application Number:
  US05/504,764
• Time in Patent Office: 623 Days
• Field of Search: 340/149 A, 340/306, 340/172.5, 235/61.7 B, 235/61.11 E, 235/61.6 H, 235/92 T, 346/60, 346/52
• US Class Current: 377/20
• CPC Class Codes: G07C 1/20 Checking timed patrols, e.g. of watchman

Abstract

A watchman'"'"'s tour recording system which includes a watchman'"'"'s unit having a clock means for producing digital time signals, a station identification signal producing means for producing digital station signals, at least two digital bit storage or memory means and special address means arranged to direct the digital time and station identification signals into predetermined locations in the memory means so that their storage capabilities are most effectively utilized. Novel photoelectric station identification signal generating means are also disclosed.

Claims

1. A watchman'"'"'s unit for recording correlated time and station identity information during a watchman'"'"'s tour, said unit comprising

clock signal means operable, upon connection of the unit to a station, to produce clock signals representative of elapsed time from the start of a tour,

station identity signal means operative, upon connection of the unit to a station, to produce station signals representative of the identity of the station,

clock signal storage means and station signal storage means for storing the signals produced by said clock signal means and said station identity signal means respectively,

at least one of said signal means being operative to produce signals in the form of binary coded digital words each made up of a predetermined number of bits,

the signal storage means associated with said one signal means having a plurality of digital bit storage elements at various locations therein for storing the bit data of a multiplicity of said digital words,

address means connected to the signal storage means associated with said one signal means and operative sequentially to render different one of said digital bit storage elements receptive to applied digital bit data, and

decoder means connected to the output of said one signal means and operative sequentially to transmit different bits of a binary coded digital word signal being produced to its associated signal storage means,

said address means and said decoder means being arranged to be operated in synchronism.

2. A watchman'"'"'s unit according to claim 1 wherein said one signal means includes a register having different stages for retaining said predetermined number of bits, said decoder means and said address means being arranged to be scanned in synchronism.

3. A watchman'"'"'s unit according to claim 2 wherein said decoder means is connected to scan said register repeatedly during each scan of said address means.

4. A watchman'"'"'s unit according to claim 1 wherein said address means comprises a counter having a count capacity equal to that of the signal storage means to which it is connected and wherein said counter has output terminals which become energized according to a pattern representative of the number of scanning pulses applied thereto, said output terminals being connected to said storage means to render said digital bit storage elements receptive to applied digital bit data according to the number of scanning pulses applied to said counter.

5. A watchman'"'"'s unit according to claim 1 wherein said decoder is connected to selected output terminals of said address means.

6. A watchman'"'"'s unit according to claim 1 wherein said address means becomes energized according to a binary counting sequence as successive scanning pulses are applied to it and wherein the outputs representative of the least significant digit of said digital bit data in said address means are connected to said decoder means in a manner such that the decoder produces an output on a single output line in accordance with the state of a stage therein corresponding to the pattern of energization of said least significant data outputs.

7. A watchman'"'"'s unit according to claim 1 wherein said unit includes means for causing a series of scanning impulses of said predetermined number to be supplied to said address means in response to the connection of said unit to a station to be checked.

8. A watchman'"'"'s unit according to claim 7 wherein said means for causing a series of scanning impulses includes said clock signal means.

9. A watchman'"'"'s unit according to claim 1 wherein said decoder means includes plural decoder units each having inputs connected to different bit output terminals of said one signal means and wherein said storage means includes plural storage units each having a data input terminal connected to the output of a different one of said decoder units, said address means being connected to each of said plural storage units for simultaneous control of said units.

10. A watchman'"'"'s unit according to claim 9 wherein said plural decoder units are connected to be operated simultaneously in synchronism with said address means.

11. A watchman'"'"'s unit for recording correlated time and station identification information during a watchman'"'"'s tour, said unit comprising

a first signal storage means,

a station input device responsive upon connection to a station to supply station identity signals to said first signal storage means,

a second signal storage means having a first plurality of digital bit storage locations for storing information in binary digital code,

digital clock means operative to produce a series of timed pulses,

time data means comprising a register for accumulating said pulses and having a second plurality of output terminals which become energized according to patterns corresponding to the number of accumulated pulses,

time data decoding means connected to said output terminals, said decoding means having a time data output terminal connected to said second signal storage means and operative in response to each of successively applied pulses to pass the signal present at a different one of the register output terminals through said time data output terminal for application to said second signal storage means,

address means connected to said second signal storage means and operative in response to each of successively applied pulses to render a different one of said digital bit locations receptive to applied time data signals, and

means for applying pulses to operate said time data decoding means and said address means in synchronism with each other in response to connection of said unit to a station.

12. A watchman'"'"'s unit according to claim 11 wherein the first plurality of digital bit locations in said second signal storage means is a multiple of said second plurality of output terminals of said time data means register.

13. A watchman'"'"'s unit according to claim 11 wherein said digital clock means is connected through a gate to said address means, means for opening said gate in response to the connection of said unit to a station to be checked and means for closing said gate in response to the passing therethrough of pulses equal in number to said second plurality.

14. A watchman'"'"'s unit according to claim 11 wherein said second signal storage means comprises a plurality of memory units each having a number of digital bit locations.

15. A watchman'"'"'s unit according to claim 11 wherein said station input device comprises means having a plurality of station identification terminals equal in number to said second plurality and means for energizing said station identification terminals according to a binary digital code representative of the identity of a station to which the watchman'"'"'s unit is connected.

16. A watchman'"'"'s unit according to claim 15 wherein said first signal storage means also has a number of digital bit storage locations equal in number to said first plurality and wherein further data decoding means are connected to said station identification terminals, said further data decoding means having a station identification data output terminal connected to said first signal storage means.

17. A watchman'"'"'s unit according to claim 16 wherein a further address means is connected to said first signal storage means, said further address means connected to be operated in response to each of said successively applied pulses.

18. A watchman'"'"'s unit according to claim 17 wherein said further data decoding means is connected to be scanned in synchronism with said further address means.

19. A watchman'"'"'s unit according to claim 18 wherein said time data decoding means and said further data decoding means have equal numbers of inputs.