US3629528A

US3629528A - Electrical timer mechanism with improved cam operated actuating means

Info

Publication number: US3629528A
Application number: US50800A
Authority: US
Inventors: Hans Hirzel
Original assignee: NOVITAS FABRIK ELEKTRISCHER
Current assignee: NOVITAS FABRIK ELEKTRISCHER
Priority date: 1969-07-07
Filing date: 1970-06-29
Publication date: 1971-12-21
Anticipated expiration: 1988-12-21
Also published as: CH507581A; FR2051581A7; DE2031332A1; CH528776A; GB1264278A

Abstract

A program-controlled electrical switching mechanism comprising a motor driven rotor and a plurality of exchangeable and angularly adjustable actuation fingers are seated axially behind one another at the rotor. Further, an additional actuation finger is secured to the rotor in a selectable angular position and a program change-switching wheel cooperates with such additional actuation finger. The program change-switching wheel is provided with axially directed cam means and a counterelement is resiliently biased against said axially directed cam means such that upon attaining at least a predetermined rotational position there is undertaken a relative axial displacement of the rotor with respect to the switching disk means seated upon a control shaft, whereby said switching disk means at said control shaft no longer cooperate with a first group of said actuation fingers at said rotor but with a second axially offset group of said actuation fingers so that a contact arrangement-actuation wheel means actuates its associated electrical contact arrangement according to a different program as a function of the momentary position of the rotor.

Description

United States Patent [72] inventor Ilans Hirzel Zurich, Switzerland [211 App]. No. 50,800 [22] Filed June 29, I970 [45] Patented Dec. 21, 1971 [73] Assignee Flrma Novitas Fabrik Elelrtrlscher Apparate AG Zurich Znrlch, Switzerland [32] Priority July 7, 1969 [33] Switzerland [31] 10450/69 [54] ELECTRICAL TIMER MECHANISM WITH IMPROVED CAM OPERATED ACTUATING MEANS 5 Claims, 4 Drawing Figs.

[52] [1.8. CI. 200/38 R, 200/38 B, 200/153 L [51] Int. Cl H0111 7/08, H01 h 43/10 [50] Field of Search 74/35, 3.52, 3.54, 3.56, 568 T; 200/38 R, 38 B, 38 BA, 38 C, 38 CA, 153, L, 153 LA, 153 LB [56] References Cited UNITED STATES PATENTS 3,089,926 5/1963 Everard et al. 200/38 D Primary Examiner-J. R. Scott Attorney-Wemer W. Kleeman ABSTRACT: A program-controlled electrical switching mechanism comprising a motor driven rotor and a plurality of exchangeable and angularly adjustable actuation fingers are seated axially behind one another at the rotor, Further, an additional actuation finger is secured to the rotor in a selectable angular position and a program change-switching wheel cooperates with such additional actuation finger. The program change-switching wheel is provided with axially directed cam means and a counterelement is resiliently biased against said axially directed cam means such that upon attaining at least a predetermined rotational position there is undertaken a relative axial displacement of the rotor with respect to the switching disk means seated upon a control shaft, whereby said switching disk means at said control shaft no longer cooperate with a first group of said actuation fingers at said rotor but with a second axially offset group of said actuation fingers so that a contact arrangement-actuation wheel means actuates its associated electrical contact arrangement according to a different program as a function of the momentary position of the rotor.

PATENIED uc21 an 3529528 SHEET 1 [IF 2 zwawm mm: #Mz a ELECTRICAL TIMER MECHANISM WITH IMPROVED CAM OPERATED ACTUATING MEANS BACKGROUND OF THE INVENTION The present invention relates to a new and improved program controlled electrical switching or timer mechanism of the type incorporating a motor driven rotor destined to be rotated at a predetermined rotational speed. A plurality of axially randomly arranged switching or indexing wheel-actuation fingers are exchangeably secured to the rotor and adjustably mounted at the rotor in selectible angular positions. These actuation fingers cooperate with switching or control disks which are fixedly seated upon a switching or control shaft mounted adjacent and parallel to the rotor shaft. Furthermore, the control shaft, which additionally carries at least one rotatable contact-actuation wheel for a respective associated electrical contact arrangement, is constructed in such a manner that during each complete revolution of the rotor the aforementioned contact arrangement is actuated in accordance with a predetermined program as a function of the momentary rotational position of the rotor.

With the requirement, which incidentally is not obligatory, that the drive motor of the aforementioned rotor performs one complete revolution every 24 hours and a daily numerical disk indicates the momentary time of day as a function of the rotational position of the rotor, the invention provides a so-called daily timer, as such, for instance, can be used for the program control of heating and air conditioning installations.

Timers of this type have already been constructed in such a manner that during predetermined days of the week, for instance for the weekend, they actuate associated contact elements in accordance with an altered daily switching program.

SUMMARY OF THE INVENTION It is a primary object of the present invention to provide an improved program-controlled electrical switching mechanism which is relatively simple in construction, extremely reliable in operation, not readily subject to breakdown, and economical to manufacture.

Another, more specific object of the present invention relates to an improved timer or switching mechanism which can be program-controlled, useful for many different applications, such as for the automatic switching-in and switching-out of certain functional operations desired to be performed in response to programmed information, and wherein the switching mechanism affords complete reliability and integrity in carrying out its intended switching operations.

In contrast to the known constructions of weekly timer switches of this type the previously defined switching mechanism of the invention is generally manifested by the features that there is also secured to the rotor, at a selectible angular position, an additional actuation finger which is destined and constructed to further index, during the course of a full rotation of the rotor, an associated program change-switching or indexing wheel through a predetermined fraction of a complete rotation. The program change-switching wheel is equipped with axially directed cam means constructed such that the program-change-switching wheel in cooperation with a counterelement resiliently pressed against its axial cam means, upon reaching at least a predetermined rotational position, brings about a relative axial displacement of the rotor with respect to indexing or switching wheels seated upon a control shaft. This displacement is carried out in such a way that these switching disks or wheels, instead of cooperating with the first-mentioned group of actuation fingers at the rotor, cooperate with at least a second group of actuation fingers which are axially offset with respect thereto. This second group of actuation fingers is likewise secured at the rotor in selectible angular positions, so that by means of the contact actuation wheels arranged upon the control shaft their associated electrical contact elements can be actuated in accordance with a different program as a function of the momentary rotor position.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be better understood and objects other than those set forth above, will become apparent when consideration is given to the following detailed description thereof. Such description makes reference to the annexed drawings wherein:

FIG. 1 is a schematic plan view of a preferred embodiment of inventive program-controlled electrical switching mechanism;

FIG. 2 is a front view of the program change-switching wheel, as viewed in the direction of line 22 of FIG. 1;

FIG. 3 is a front view of the shaft-switching wheel, viewed in the direction of the line 3-3 of FIG. 1; and

FIG. 4 is a front view of the contact arrangement and the contact actuation element, viewed in the direction of the line 4-4 of FIG. I.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Describing now the drawings, and with particular reference at this time to the exemplary embodiment of inventive program-controlled switching mechanism or timer depicted in FIG. 1, there will now initially be considered the basic construction of this switching mechanism. As best seen by referring to this FIG., three sideplates ll, 12 and 13, disposed in substantial parallelism to one another, are fixedly secured to any suitable nonillustrated platform or support structure. Similarly, three contact springs or

blades

140, 141 and 142, likewise arranged upon a stationary platform or support, collectively form the contact arrangement to be actuated in accordance with a given program. A timer motor 15 or any other suitable type of motor which operates continuously with a constant rotational speed is mounted at the sideplate 12. A speed reduction transmission or drive 16 is fixedly arranged between the sideplates 12 and 13. Speed reduction drive or gearing 16 serves to transform the rotational speed of the power takeoff shaft of the timer drive motor 15 such that the power takeoff shaft of the speed reduction drive 16 always performs one complete revolution in a time span of 24 hours.

A rotor 17 is rigidly connected for rotation with this shaft 160. Rotor 17 supports a digit or instrument dial at which it is possible to read off at least quarter-hour time periods.

Finger disks

171, 172, 171, 172' are secured in any suitable known manner coaxially with respect to the rotor 17 and these finger disks are mounted relative to such rotor such that they can be at least fixedly positioned in incremently selectible rotational positions. Further, the

finger disks

171, 172, 171 and 172 are connected with a respective switching wheel-

actuation finger

171a, 172a, 171a, 172a protruding radially over the periphery of the rotor 17. A switching or control shaft 20 consisting of the integrally connected

shaft sections

21, 22 and 23 is mounted to be rotatable and axially displaccable to and fro in the three

sideplates

11, 12 and 13 parallel to the shaft 150 of the timer motor 15 and the shaft 160 of the speed reduction drive 16 and the rotor 17. Control shaft 20 supports at its central region 22 a prebiased helical or spiral spring 30 surrrounding the central portion 22 of this shaft 20, one end of this spring 30 being supported at the sideplate 12, the other end striving to displace the entire control or switching shaft 20 out of the position shown in FIG. 1 in the direction of the arrow D.

A hub sleeve member 40 retained to be axially nondisplaceable between the sideplates 12 and 13 and rigidly connected for rotation with the control shaft portion 23 piercingly extending therethrough and displaceable axially therein, rigidly carries for rotation a star wheel or slotted disk 41. Disk 41 cooperates with a stationarily mounted counterlocking or ratcheting element 42 such that the control shaft can only assume stable discrete rotational positions according to the subdivision of the star wheel or ratchet disk 41. This ratchet disk 41 corresponds in its shape to the hereinafter to be described switch disk or wheel 51 illustrated in FIG. 3. This control shaft-switching wheel 51 is rigidly connected for rotation and axially fixedly connected with the control shaft section 23. in much the same manner, the similarly constructed second control shaft-switching wheel 52 axially spaced from the switching wheel 51 is operatively coupled with the control shaft section 23. At the outer end of the control shaft section 23 there is mounted to be freely rotatable a program change-switching wheel 53, shown in front view in FIG. 2, this control or switching wheel 53, however, being mounted so as to be axially fixedly connected with the shaft section 23.

Program change-indexing or switching wheel 53 supports at its end face confronting the control shaft-switching

wheels

51 and 52 an axially acting cam profile portion 530. Cam profile portion 530 is subjected to the action of the prebias of the spring member 30 and is continuously pressed against a plate member 133 supported via the

bolts

131 and 132 at the sideplate 13. When the plate member 133, during subsequent to be described rotational movement of the program changeswitching wheel 53, moves from the illustrated normal position and travels on to an axially protruding cam section of the cam profile portion or element 530, the program changeswitching wheel 53, and together therewith the entire control shaft 20 and all components fixedly connected thereto are axially displaced against the prebias force of the spring member 30 through a distance corresponding to the axial cam height and opposite to the direction of the arrow D. In so doing, the control or switching

wheels

51, 52, which previously as shown in FlG. 1 were located adjacent the

finger disks

171 and 172, respectively, are displaced adjacent the

respective actuation fingers

171a and 172a of the

finger disks

171 and 172, respectively, of the rotor 17.

Fixedly seated at the outer end of the control shaft portion 21 are two contact-actuation disks or wheels 60 and 60', which according to FIG. 4, are destined and constructed to press the switching contact blade or spring 140 of the switching contact arrangement 14 alternatingly against the contact spring 141 and the contact spring 142.

As best observed by referring to FIG. 3, the indexing or switching wheel 51 is always rotated or indexed further through one-sixth of a revolution by virtue of the actuation finger 1710 of the disk 171 which engages therewith once each day. As a result, the uniformly subdivided ratcheting disk 41 and the hub sleeve member 40 ensures for the fixed retention of the control shaft 20 in the appropriately attained rotational position. It is here assumed that the finger 171a of the disk 171 always switches the control shaft-switching wheel 51 and thus the control shaft 20 and the contact actuation wheels 60, 60' into a rotational position in which the contact blades or

springs

140 and 141 are electrically connected, whereas the finger 17a at the disk 172 for the associated control shaftswitching wheel 52 and the contact actuation wheels 60, 60' are switched into a position where the

contact springs

140 and 142 are electrically coupled with one another. By means of these two finger-

support disks

171 and 172 and the associated two

shaft switching wheels

51 and 52 it is thus possible to switch-in and switch-out once each day, at a predetermined period of time in the day, a current circuit controlled by the

contact springs

140, 141, 142 or the like.

In the event that the same switching operation is to be carried out a number of times per day, then it is possible to appropriately arrange a corresponding greater number of pairs of control shaft-switching

wheels

51 and 52 upon the switching or control shaft section 23 and a corresponding greater number of pairs of associated

finger disks

171 and 172 with their actuation fingers at the rotor 17.

According to FIG. 2 the program change-indexing wheel 53 exhibits seven divisions and thus is indexed once each day through one step by the actuation finger 173a of the disk 173 at the rotor 17 and, thus, in a week performs a complete rotational movement through all seven divisions, each indexing step being carried out at a predetermined period of time in the day. Accordingly, at certain days of the week and in accordance with the arrangement of the axial cam means of the cam profile 530 of the program change-switching wheel 53, the control shaft 20 and the indexing or switching

wheels

51 and 52 fixedly seated thereon are axially displaced through a predetermined path opposite to the direction of the arrow D in FIG. 1, so that then the actuation fingers 171a and 1724 of the

disks

171 and 172 at the rotor 17 no longer are positioned adjacent the switching disks or

wheels

51 and 52, rather a second group of actuation fingers 171a and 1720' appropriately axi ally displaced with respect to the first mentioned actuation fingers, and located at the

disks

171 and 172 at the rotor 17. At this second group of actuation fingers it is possible to freely adjust or regulate a different daily switching program for the contact blade or spring group arrangement 14. Moreover, it is of course readily possible to provide at the control shaft 20 a number of pairs of

contact actuation wheels

60, 60 and a number of associated contact spring groups 14 in order to alternatingly switch-in and switch-out other current circuits in accordance with a desired program.

It is readily to be understood that with the described arrangement it is possible to preselect, in a very simple manner, different program switching sequences in electrical current circuits at predetermined days of the week. Changes of the individual daily programs require a new setting of the

finger disks

171, 172 171', 172' at the rotor 17.

Furthermore, changes of the weekly program are possible by changing the cam positioning or distribution at the program change-indexing wheel 53 or by changing such wheel or disk for a different one equipped with other cam distributions or designs. In special situations, it is also possible to control a given week day for a special program by changing the adjustment of the switching wheel 53 at the control shaft 20.

A primary advantage of the illustrated and described exemplary embodiment resides in the fact that the time of day at which the further indexing of the program change-switching wheel 53 is always to occur by means of the finger disk 173 at the rotor 17, is freely selectible in such a manner that there is not associated therewith any malfunctioning or disturbance of the current circuit controlled by the switching mechanism. This would be, for example, the case if at the time of indexing of the program change-switching wheel according to the previous program a current circuit would have to be switched in which then must be switched in again after the program change.

It should be apparent from the foregoing detailed description, that the objects set forth at the outset to the specification have been successfully achieved.

Accordingly, what is claimed is:

1. A program-controlled electrical switching mechanism comprising a motor driven rotor including a rotor shaft rotatable at a predetermined rotational speed, a control shaft mounted substantially parallel to said rotor shaft, switching disk means fixedly seated at said control shaft, a plurality of actuation fingers seated axially behind one another at said rotor, said actuation fingers being exchangeably secured at said rotor and being selectively adjustable with respect to their angular position, said actuation fingers cooperating with said switching disk means for stepwise indexing of said control shaft, at least one electrical contact arrangement, at least one contact arrangement-actuation wheel means carried by said control shaft for each said electrical contact arrangement, said actuation wheel means cooperating with said electrical contact arrangement, such that during each full revolution of said rotor said control arrangement is actuated in accordance with a predetermined program as a function of the momentary rotational position of said rotor, an additional actuation finger secured to said rotor in a selectible angular position, a program change-switching wheel cooperating with said additional actuation finger such that during the course of a complete revolution of said rotor said program change-switching wheel is indexed through a predetermined fraction of a complete revolution by said additional actuation finger, said program change-switching wheel being provided with axially directed cam means, a counterelement resiliently biased against said axially directed cam means such that upon attaining at least a predetermined rotational position there is undertaken a relative axial displacement of said rotor with respect to said switching disk means seated upon said control shaft, whereby said switching disk means at said control shaft no longer cooperate with a first group of said actuation fingers at said rotor but with a second axially offset group of said actuation fingers so that said contact arrangement-actuation wheel means actuates its associated electrical contact arrangement according to a different program as a function of the momentary position of said rotor.

2. A program-controlled electrical switching mechanism as defined in claim 1, wherein said program change-switching wheel is mounted to be freely rotatable upon a portion of said control shaft and coaxially with respect to said control shaftswitching disk means arranged nonrotatably upon said coritrol shaft, said program change-switching wheel further being axially nondisplaceably mounted with respect to said switching disk means such that the axial displacement of said program change-switching wheel relative to said rotor and the thereon seated actuation fingers imposed upon said program changeswitching wheel by virtue of predetermined rotational positions thereof due to the arrangement of its cam means is transmitted to said control shaft-switching disk means.

3. A program-controlled electrical switching mechanism as defined in claim 2, wherein said rotor performs one complete revolution every 24 hours and said program change-switching wheel possesses means enabling it to assume seven discrete rotational positions so that at certain predetermined days of the week a second switching program for the contact arrangement becomes effective.

4. A program-controlled electrical switching mechanism as defined in claim 1, wherein said program change-switching wheel is mounted to be exchangeable.

5. A program-controlled electrical switching mechanism as defined in claim 1, wherein said axial cam means provided at said program change-switching wheel are arranged to be selectively positionable.

Claims

2. A program-controlled electrical switching mechanism as defined in claim 1, wherein said program change-switching wheel is mounted to be freely rotatable upon a portion of said control shaft and coaxially with respect to said control shaft-switching disk means arranged nonrotatably upon said control shaft, said program change-switching wheel further being axially nondisplaceably mounted with respect to said switching disk means such that the axial displacement of said program change-switching wheel relative to said rotor and the thereon seated actuation fingers imposed upon said program change-switching wheel by virtue of predetermined rotational positions thereof due to the arrangement of its cam means is transmitted to said conTrol shaft-switching disk means.