DE2415375A1 - TIMER ACTUATED BY CAM - Google Patents

Description

Patent Attorneys Dipl. -Jlng. R v / eickmann,

Dipl.-Ing. H.Weickmann, Dipl.-Phys. Dr. K. Fincke

D1PL.-ING. F. A. WeICKMANN, D1PL.-CHEM. B. HUBER

DXIII / KtZ ⁸ MUNICH 86, DEN

PO Box 860 820 MDHLSTRASSE 22, CALL NUMBER 98 39 21/22

Mallory & Co. Inc., 3029 East Washington Street, Indianapolis, Indiana, USA

By cams, operated time switch

The present invention relates to a cam operated timer for domestic and industrial appliances such as Kitchen appliances in which a certain switch-on time should be preset. As such devices in many cases As the time switches and their controls become ever smaller and more compact, they must be grounded ever smaller. In a kitchen appliance For example, if the time switch is to be mounted in a small molded plastic support, where larger switches are no longer possible fit.

The present invention is therefore based on the object specify a timer operated by a cam, which

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is made very thin in the direction parallel to a motor shaft actuating it. This object is achieved in a cam-operated timer by the following features: a cam arrangement with a primary and a secondary cam element, of which the primary cam element on one shaft of a synchronous motor and the secondary cam element on another parallel to the shaft of the synchronous motor Shaft, an electrical switch assembly operated by the cam assembly with a long and a short set of Eontakt 'bearing' blades, the long set of which is on one side of a line running through the centers of the primary and secondary Noekenelements and the short Set is arranged on the other side of this line, a housing enclosing the cam assembly and the switch assembly and means for fastening the synchronous motor to the housing.

In one embodiment, the cam assembly rotates in a thin housing that has two sets of slots, wherein a plurality of contact bearing blades actuated by the cam assembly are arranged in a group of the slots.

In the embodiment with two cam elements, these cam elements are not arranged on a line, as in many known time switches, but rotatably next to one another. In such Ausführüngsform the time switch to a version with a line arranged on the cam elements with the same number and size of the cam elements in the direction parallel to the cam axis is thinner.

By the present invention, a large number of possible combinations of cam elements results and- sets of contact-bearing sheets. In an embodiment with a cam element, a plurality of contact-bearing blades actuated by that element can be arranged in a group of two groups of slots so that they are 'in each

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Direction of rotation of the cam element can be actuated by this. In addition, the cam element can be tilted by 180 °, whereby the same cam profiles come into operative connection in an inverted arrangement with the contact-carrying blades.

The versatility of the time switch according to the invention shows also applies to the embodiment with two cam elements rotating next to one another. The long and short sentences of contact bearing leaves "is each in a group of the two groups arranged by slots. The slots are designed in such a way that the long and short sets of contact bear Sheets can be interchanged with one another, wherein each set can be brought into operative connection with each cam element. To support this interchangeability of cam elements and contact Realizing scrolls are the two sets of slots on opposite sides of one through the centers of the two cam elements arranged running line.

In a further development of the invention, contact spacers are provided, by means of which two contact-bearing sheets in each sheet set can be brought into a predetermined distance, thereby improved electrical switching properties due to more precisely adjusted air gaps between the contacts can be obtained.

The time switch according to the invention therefore has a large number of possible positions and combinations of cam elements and contact-bearing leaves can be realized. If there are two squat elements, they preferably rotate on parallel ones Waves in opposite directions. That the cam arrangement and the housing enclosing the switch arrangement forms a means for holding, locating and fastening the Contact wearing leaves. The housing is simple and compact, which makes the timer according to the invention overall is easy and therefore economical to manufacture.

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The invention is illustrated below with reference to in the figures Embodiments explained in more detail. It shows:

! ig. Figure 1 is an elevation of an embodiment of the invention Time switch;

Pig. Figure 2 is a front view of an embodiment of the invention Zeipshalterers without one shown in FIG A motor having a primary cam element and a set of contact bearing blades;

Fig. 3 is a front view of the embodiment shown in Fig. 2 with a tilted cam element and a different arrangement the contact-bearing leaves;

Pig. 4 is a front view of an embodiment of the invention without the one in Pig. 1 shown engine with two cam elements and two sets of contact-bearing sheets;

Pig. 5 is a front view of the in Pig. 4- embodiment shown with tilted cam elements and reversed Sets of contact bearing sheets; and

Pig. Figure 6 is a rear view of a slider engaging a set of contact bearing blades.

According to the drawing, a time switch according to the invention has a synchronous drive motor 10 and a time part 20, which are attached to one another by a device 13. A gear housing 11 is provided for the synchronous drive motor 10. The device 13 comprises a plurality of hollow rivets 16, which in Holes in the housing 11 and in the time part 20 sit and have heads, through which these two elements are attached to each other.

In the embodiment according to the Pig. 2 and 3 includes a cam

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arrangement 26, a primary cam element 32 with two cam tracks 34 and 36. This cam element 32 is seated on a shaft 38 of the engine 10.

In the embodiment according to the S ¹ Ig. 4 and 5, a cam arrangement 27 comprises a primary cam element 40 with two cam tracks 42 and 44 and a cam separation arrangement 46. This cam separation arrangement 46 is formed by a drive wheel 48 which is seated between the two cam tracks 42 and 46. The cam assembly further comprises a secondary cam member 50 with two cam tracks 52 and 54, and a cam separator assembly 56. Since ^s secondary S-cam element 50 sits on a second shaft _49} v / hich is rotatably supported in a cap-shaped housing 58th The cam separating arrangement 56 is formed by a drive wheel 57 which sits between the two cam tracks 52 and 54-. At 51, the two cam elements are in engagement with one another via the drive wheels 48 and.

In both embodiments, a housing 30 is in shape of a parallelepiped formed by a housing cap 58 and a thin and flat cover 60. That The ratio of the thickness to the circumference of the housing 30 is between 1/40 to 1/20, the thickness being in a direction to the longitudinal axis of the shaft 38 parallel direction and the circumference along the outside of the housing 30 is measured in a direction perpendicular to the longitudinal axis direction of the shaft 38. The housing cap 58 has 2, a first set of slots 62 in a wall 59. According to FIG. 3, there is a second set of slots 64 also provided in the wall 59 in another position. These sets of slots 62 'each comprising a plurality of slots and 64 are provided on opposite sides of a line A-B passing through the centers of the primary cam member and the secondary cam member 50 extends. In the figures 4 and 5 both sets of slots 62 and 64 can be seen at the same time.

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An electrical switch assembly 28 includes a plurality of contact bearing blades 66 and 68, which in the embodiment according to the IPig. 2 and 3 · in one of the sentences iron Slots 62 or 64 are used. At the free ends of this Blades 66 and 68 are cam follower tips 6? and 69. Furthermore electrical contacts 63 are provided on sheets 66 and 68. The thin and flat cover 60 of the housing 30 firmly selects the contact bearing blades 66 and 68 in the slots of the slot set 62 or 64.

In the embodiment of Figures 4 and 5, an electrical switch assembly 29 comprises a long set 70 and a short set 72 of contact bearing blades which are inserted into a set of slots 62 and 64, respectively. The long set 70 is actuated by the primary cam element 40, while the short set 72 is actuated by the secondary cam element 50. Cam follower tips 74 are provided ₅ while the free ends of two sheets of the short set 72 cam follower tips 78 and 80 have at the free ends of two sheets of long sentence 70th A first contact set 71 is provided on the long set 70 of contact-bearing sheets and a second contact set 73 is provided on the short set 72 of contact-bearing sheets. The thin and flat cover 60 of the housing 30 retains the sets 70 and 72 in the slot sets 62 and 64.

In the embodiment of Figures 4 and 5, the long set 70 of contact bearing blades is located on one side of the line AB passing through the centers of the primary cam element 40 and secondary cam element 50, while the short set 72 of contact bearing blades is arranged on the other side of this line AB.

A contact from spacer 82 is formed by a slide 84, which on a guide of a large number of slide

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guides 86 translationally freely movable. These slide guides are provided on the inside of the housing 58. The slide 84 has stops 88 and 90, v / elche with the long set 70 of contact bearing blades. A slide 92 has stops 94 and 96, which with the short set? 2 of contact bearing blades engage. The sets 70 and 72 of contact bearing sheets hold the Slider 82 or 92 in contact with a slider guide 86. The synchronous drive motor 10 offset the shaft 38 and that on its seated primary cam element 40 in rotation.

In the embodiment according to the I ¹ Xg. 2 and 3, the primary cam element 32 passes the cam follower tips 68 and 66, whereby the contacts 63 are closed or interrupted as a function of the profiles on the cam tracks 34 and 36.

If in another embodiment according to the Pig. 4 and 5 cLas primary cam element 40 rotates past the cam follower tips 74 "and 76, so the long set 70 of contact bearing sheets becomes corresponding of the profiles on the cam tracks 42 and 44 are actuated, resulting in an opening or closing of the electrical contacts leads.

Furthermore, the drive wheel 48 drives the drive wheel 47 on the Secondary cam element 50. This causes the cams to rotate 52 and 54 past the cam follower tips 78 and 80. The short Set 72 of contact bearing sheets is made according to the Profiles on the cam tracks 52 and 54 actuated, resulting in a Opening or closing the electrical contacts 73 leads. The stops 88 and 90 of the slide 84 occur with two leaves of the long set 70 of contact bearing blades engaged, whereby the contacts 71 during opening and closing a certain distance can be preset. Correspondingly, the stops 94 and 96 occur on the slide 92 with two Scroll the short set 72 of contact bearing sheets in Engagement to preset a certain spacing of the contacts 73 during opening and closing.

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Claims (12)

Patent claims 1.j by. Cam-actuated timer, marked by a cam arrangement (27) with a primary and a secondary cam element (40,50), of which the Primary cam element (40) on a shaft (38) of a synchronous motor (10) and the secondary cam element (50) on another shaft (49) parallel to the shaft of the synchronous motor ■ sits, an electrical, from the cam assembly (27) actuated switch assembly (29) with a long and a short set (70,72) of contact-bearing sheets, of which the long set (70) on one side one through the Centers of the primary and secondary cam elements (40,50) running line (A-B) and the short set (72) on the other Side of this line is arranged, the cam assembly (27) and the switch assembly (29) enclosing housing (30) and by a device (13) for fastening the Synchronous motor (10) on the housing (30). 2. Switch according to claim 1, characterized in that that the primary and the secondary cam element (40,50) each have a drive wheel (48,57) and two by a 'separating arrangement (46) comprises separate cam rings (42,44; 52,54). 3 o, switch according to claim 1 and 2, characterized in that the separating arrangement (46) is formed by the drive wheel (48 or 57). 4. Switch according to one of claims 1 to 3j, characterized in that the secondary cam element (50) is driven by the primary cam element (40) via the drive wheels (48,57). 5- switch according to one of claims 1 to 4, characterized in that that the short set (72) of contact bearing blades through the secondary cam member (50) and the long set (70) of contact bearing blades is actuated by the primary cam member (40). 409843/0759 - 9 - 6. Switch according to one of claims 1 to 5 »thereby g ekennzeicb.net, "that the housing (30) is formed by a housing cap (58) and a thin flat cover (60); is. 7- switch according to one of claims 1 to 6, characterized in that that the housing cap (58) has several slots (62 or 64) in a side wall (59), in where the long and short sets (70,72) of contact-bearing sheets are arranged. 8. Switch according to one of claims 1 to 7 »thereby g ekennze i chnet that the thin flat cover (60) holds the long and short sets (70,72) of contact bearing blades in slots (62 and 64, respectively). 9. Switch according to one of claims 1 to 8, characterized in that that sheets of the long and short set (70,72) of contact bearing sheets through a contact spacer are kept at a distance from each other. 10.Switch according to one of claims 1 to 9 »characterized in that that the contact spacer comprises at least one slide (84 or 92), the longitudinal one of several slide guides (for example 86) is freely movable in translation. 11. Switch according to one of claims 1 to 10, characterized in that that one sheet of the long and the short set (70,72) of contact bearing sheets holds the slide (84 or 92) in contact with a slide guide (e.g. 86). - 10 - 409843/0759 12. Switch according to one of claims 1 to 11, characterized characterized in that the housing (30) enclosing the cam arrangement (27) and the switch arrangement (29) is made thin in the direction parallel to the shaft (38) of the motor (10). 13- switch according to one of claims 1 to 12, characterized in that that the ratio of thickness to circumference of the housing (JO) is 1/40 to 1/20, the Thickness in a direction parallel to the longitudinal axis direction of the shaft (38) and the circumference along the outside of the housing is measured in a plane perpendicular to the longitudinal axis direction of the shaft. - Peeler in particular according to one of claims 1 to 13, characterized characterized in that the cam arrangement (26) two concentrically on the shaft (38) of the motor (10) sedentary mock tracks (3 ^, 36) that includes a multitude von Eontakt bearing sheets (66,68) 'from the Uockenspuren are actuated and that the housing (30) is designed as a parallelepiped. 409843/0759