AU5393473A - - Google Patents

Description

4AWA 636 REGULATION 9.

FORM 1

COMMONWEALTH OF AUSTRALIA

3 4'H f3 PATENTS ACT 1952-1969

COMPETE AFTER PRISIOM SPECIFtCATION No. k

APPLICATION FOR A PATENT

We, AMALGAMATED WIRELESS (AUSTRALASIA) LIMITED, Wireless Manufacturers and Communication Engineers, of 47 York Street, Sydney, New South r-les, hereby apply for the grant of a Patent for an invention entitled:

"IMPROVEMENTS IN ELECTRONIC TACHOMETERS"

which is described in the accompanying provisional specifi- cation.

Our address for service is

Chief of Patents, Amalgamated Wireless (Australasia) Limited, 47 York Street, S Y D N E Y. New South Wales. 2000

SDated this day of 197k RECEIVED L.ia 4/72 AMALGAMATED WIRELESS (AUSTRALASIA) LIMITED i R~cript--

Appij o-

by Chi of Ptents

immissioner of Patents ztw.

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AWA 636 I REGULATION 12'(1)

FORM 7 COMMONWEALTH OF AUSTRALIA PATENTS ACT 1952-1969 /73 DECLARATION IN SUPPORT OF AN APPLICATION FOR A PATENT

In support of the Application made by AMALGAMATED WIRELESS (AUSTRALASIA) LIMITED for a patent for an invention entitled:- "IMPROVEMENTS IN ELECTRONIC TACHOMETERS" I, BERNARD JOHN SIMPSON, Chief of Patents of and on behalf of the said Company, AMALGAMATED WIRELESS (AUSTRALASIA) LIMITED, of 47 York Street, Sydney, New South Wales, Commonwealth of Australia, do solemnly and sincerely declare as follows:-

1. I am authorised by AMALGAMATED WIRELESS (AUSTRAL- F ASIA) LIMITED, the applicant for the patent to .make this declaration on its behalf. 2. DAVID KERRY MONEY, Engineer, of 49 Campbell Avenue, Normanhurst, near Sydney, New South Wales, Common- wealth of Australia, a British Subject, CHRISTIAAN MYER, Technical Officer, of 68 Beale Crescent, Fairfield, near Sydney aforesaid, a Dutch Citizen, and TERENCE JOHN THOMAS SMITH, Technical Assistant, of 191 George Street, Parramatta, near Sydney aforesaid, a British Subject, are the actual inventors of the invention and the facts upon which AMALGAMATED WIRELESS (AUSTRALASIA) LIMITED are entitled to make the application are as follows:-

The said AMALGAMATED WIRELESS (AUSTRALASIA) LIMITED is the assignee of the said DAVID KERRY MONEY, CHRISTIAAN MYER and TERENCE JOHN THOMAS SMITH by virtue of a Deed of Assignment dated 21st day of June, 1972. DECLARED at Sydney this 22Aday of 'J ,19

TO: I The Commissioner of Patents 2611r In-j

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-IAUALIAk

Form PATENTS ACT 1952-1973

COMPLETE SPECIFICATION (ORIGINAL) FOR OFFICE USE Class: 664' 12 Int. Cl: oP/

Application Number: 53( 93L1(7Z Lodged: 261(o)?2

Complete Specification-Lodged: 29(3/73 Acetd W"?J)f2FkWQ PAeTc- Published: 13(F017p

Pricr~ity t,3 (C

Related Art:

TO BE COMPLETED BY APPLICANT Name of Applicant: LCC~T~ VPjIzEtLCS5 6(M-0TQ4ASN) Lu'(MITfTD

Address of Applicani:

Actual Inventor: 'V-AI 'V

Address for Service:

Complete Spe~cification for the invention entitled: f?~~1T 1~tLTO\I ~CH*~)P

The following statement. is a full description of this invention, including the best method of performing it known to me:- *Note: The description is to be typed in double spacing, Pica type face, in an area not exceeding 250 mm in depth and 160 mm In width, o~n tough white paper of good quality and it is to be inserted Inside this form. 12593/75--L r. D. Atkinson, Government Printer, Conberro

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FORM 10 REGULATION 13(2) COMMONEALTH OF AUSTRALIA PATENTS ACT 1952-1969

COMPLETE SPECIFICATION FOR TIE INVENTION ENTITLED: "IMPROVENENTS IN. ELECTRONIC TACHOMETERS"

The following statement is a full description of this invetion, including the best method of performing it known. tQo 11s:-

fae stanta to vabi. om 1- ~s 2 aU Qw..

This invention is directed to improvements in

electronic tachometers, one objective being the provision of such tachometers wherein means are provided for initiating external functions at one or more various predetermined and adjustable speeds. An electronic tachometer in accordance with

this invention comprises a-timing circuit, means for applying to the timing circuit pulses representative of the rotational speed to be measured, means for averaging the said pulses, a So.: 10 buffer circuit, and-means responsive to the attainment or non-. So attainment of at least one predetermined rotational speed to initiate a function. o

S° An electronic tachometer in accordance with a further development of this invention includes means for indi-

cating continuously the rotational speed to be measured.

o SThe invention will now be explained with refer- S°.ence to the accompanying diagram, which shows one example of an electronic tachometer in accordance with this invention. It

is assumed that electrical pulses' representative of the rotat- ional speed to be measured are present at terminal 1. These pulses are applied to a timing circuit 2, which may by way of

example comprise a DC set-reset bistable circuit coupled to a "capacitor run-up" monostable circuit. The use of a bistable circuit ensures that the calibration and accuracy of the novel arrangement is not affected by the magnitude of the pulses applied through terminal 1, with the normal proviso that for any circuit, there will be a maximum pulse amplitude that can- not be exceeded. The pulse duration must naturally be shorter than the period set by the timer arrangement itself. The "capacitor run-up" type of circuit is very advantageous for

2 a *^*laiS"l^*lTLl-la' MM^Ml this application, as it can be made immune to variations in the power supply provided to energise the arrangement, rendering the use of a regulated power supply unnecessary. The output of the bistable circuit 2 is applied to an averaging circuit 3, the function of which is to provide a steady signal representative of the rotational speed being measured. The output of the averaging circuit is in turn applied to a buffer circuit 4, the function of which is to protect the circuit as described so far against the loading effects of other circuit elements which are to be connected. to *0

S In the exemplary arrangement shown, a number of functions is 0 performed by the trrangement, and these will be described in

turn. Firstly and in accordance with this invention there is

0oo o provided means responsive to the attainment or non-attainment as the case may be of at least one predetermined rotational speed to initiate a function. By way of example there is pro-

ided a voltage comparator 5, typically a Schmitt trigger circuit, to one input of which is applied the averaged signal

from the averagi.ng circuit via the buffer circuit. To the other input of the voltage comparator there is applied a reference voltage, which may be a preset adjustable voltage, applied to the terminal 6. At rotational speeds lower than the predetermined speed, the voltage comparator will exhibit one condition, whilst at rotational speed higher than the pre- determined speed, the voltage comparator will exhibit a second and alternative condition. This change of condition may be used to operate a relay, light a lamp or otherwise control an external function.

This invention is not concerned with the nature of the external functio1 controlled in this way. Typical applications would include the initiation of warning or stopping procedures when the rotational speed being monitored rose to an unacceptable value. The diagram'shows a further voltage comparator 7 and reference voltage terminal 8, the functions of which are analogous v'ith those already described in relation to 5 and 6. They are included-to demonstrate that the invention is not restricted to the use of one such function initiating means. The invention as described so far has been 10 directed to the initiation of one or more functions at predet- oosa o ermined rotational speeds. However, it will be clear that the arrangement is.also capable of providing a continuous indicat- ion of rotational speed. This is readily achieved by connecting to the buffer stage an indicating instrument 9, which may be calibrated as described.

i

4

Claims (1)

1. follows: The claims defining the invention are as 1. An electronic tachometer comprising a timing circuit, means for applying to the timing circuit pulses the freq- uency of which is representative of the engine rotational speed to be measured, means for averaging the said pulses, a buffer circuit, and means responsive to the rotational speed. An electronic tachometer as claimed in claim 1 including means responsive to the attainment or non- attainment of at least one predetermined rotational speed S, "to initiate at least one respective function.

   S* 3. An electronic tachometer as claimed in either of the

   foregoing claims including means for indicating continuously U" the rotational speed. 4. An electronic tachometer as claimed in any one of the S- foregoing claims wherein the timing circuit includes a ',bistable circuit coupled to a capacitor run-up circuit. An electronic tachometer substantially as described herein with reference to the accompanying drawing. 20 Dated this 14th day of March, 1973. AMALGAMATED WIRELESS (AUSTRALASIA) LIMITED.

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