DE102020105708B4 - Cooking appliance light with a form-fittingly held light-conducting rod and method for installing a light-conducting rod - Google Patents

Abstract

Cooking appliance lamp (10) - with a carrier (11) which forms a lamp holder (14), in which a lamp (15) in the form of a circuit board (16) with at least one LED sits and has a receiving socket (12) which has a opening is connected to the receptacle for the illuminant (15), with a light-conducting rod (13) which sits in the receptacle socket (12) and into which the light emitted by the illuminant (15) passes through the opening between the receptacle socket (12) and the illuminant receptacle (14) is fed in, with- the light-conducting rod (13) being fixed in the carrier (11) by means of a form-fitting connection,- the form-fitting connection of a holding part on the side of the carrier (11) and a circumferential cutout (24) on the side of the light-conducting rod (13) is formed, wherein the holding part for fixing the light-conducting rod (13) on the carrier (11) engages in the circumferential cut-out (24), characterized in that the receiving socket (12) for the light-conducting rod (13) in its circumference angswand has an opening (40) and- the holding part is formed by a spring pin (43) which can be placed on the outer circumference of the receiving socket (12) and has at least one holding leg (45),- the spring pin (43) passing through the opening (40) into the engages with the opening (40) aligned circumferential cutout (24) of the fiber-optic rod (13).

Description

First of all, the invention relates to a cooking appliance lamp with a carrier that forms a lamp holder, in which a lamp sits in the form of a circuit board with at least one LED and has a receiving socket, which is connected via an opening to the holder for the lamp, with a fiber optic rod, which sits in the receiving socket and into which the light emitted by the lamp is fed through the opening between the receiving socket and the lamp socket, the light-conducting rod being fixed in the carrier by means of a positive-locking connection, the positive-locking connection of a holding part on the side of the carrier and a peripheral cut-out on the side of the light-conducting rod is formed, wherein the holding part for fixing the light-conducting rod on the carrier engages in the peripheral cut-out.

The invention then relates to a method for installing a light-conducting rod in a cooking appliance light.

Cooking appliance lights are known in a variety of forms from the prior art. So shows DE 20 2015 104 575 U1 a household appliance light whose fiber optic rod snaps into a holding part. DE 10 2016 116 446 A1 shows a household appliance light in which holding projections engage in securing grooves of a light-conducting rod and thus fix the light-conducting rod in the light. EP 2 366 323 A1 shows a dishwasher whose lamp cover is locked in a holding part.

U.S. 2004/0190306 A1 shows a lamp whose fiber optic rod is provided with an annular groove in which a spring washer rests. A hollow-cylindrical holding piece has an inner circumferential groove which accommodates the spring washer when the fiber optic rod is mounted.

Finally she can DE 10 2018 111 092 A1 serve as an example. Here, a fiber optic rod is held by a carrier in a receiving socket and emerges from the exception socket on one side. An LED circuit board is arranged on the receptacle of the carrier opposite the exit side of the light-conducting rod. The LED is positioned in the area of a light feed surface of the light-conducting rod. A heat sink is also coupled to the carrier to absorb the operating heat of the LED and dissipate it to the environment.

In the DE 10 2018 111 092 A1 the receiving socket is cylindrical and surrounds a longitudinal section of the light-conducting rod. The receiving socket is slotted in the axial direction and surrounded by a clamping ring. This clamping ring builds up a clamping tension that presses the wall of the receiving socket against the fiber optic rod and thus holds the fiber optic rod in the carrier with a non-positive fit. A similar light rod definition is in DE 20 2019 106 170 U1 shown.

Even if fixing the fiber optic rod in the carrier satisfies the requirements, installing the clamping ring is extremely complex. After inserting the fiber optic rod into the socket, this must be pushed onto the socket via the free end of the fiber optic rod. In order to apply clamping forces, the clamping ring must be widened against a spring preload. Even if the outer circumference of the receiving socket is provided with webs to reduce frictional forces, which webs in turn have inclined surfaces for easier placement of the clamping ring, the assembly forces to be applied are still comparatively high. In addition, the edges of the clamping ring must be machined so that this ring, which is usually made of spring steel, does not damage the receiving socket, which is usually made of plastic.

The object of the invention is to provide a generic cooking appliance light with a simplified light-conducting rod assembly.

The object is achieved by a cooking appliance light with the features of claim 1, in particular with its characterizing features, according to which the receiving socket for the light-conducting rod has an opening in its peripheral wall and the holding part is formed by a spring pin with at least one holding leg that can be placed on the outside of the receiving socket. the spring pin engaging through the opening in the circumferential cutout of the light-conducting rod aligned with the opening.

Compared to the force-fit connection known from the prior art using a clamping ring, a form-fit connection essentially has the advantage of simple and essentially force-free assembly. For example, a form-fitting connection in the form of a bayonet connection is contemplated (not covered by the invention), in which at most small forces are required when inserting the light-conducting rod into the receiving socket and turning it in the receiving socket. The light-guiding rod is inserted into the receiving socket via an opening of the receiving socket facing away from the light source. In this way, the assembly of the fiber optic rod is independent of the assembly of the light source.

The form-fitting connection is formed by a holding part on the carrier side and a peripheral cutout on the light-conducting rod side. wherein the holding part engages in the peripheral cut-out for fixing the light-conducting rod on the carrier.

In the invention, the fiber-optic rod is provided with a cutout in its peripheral surface, for example in the form of a groove made in the peripheral surface, and a holding part is provided on the carrier side, which engages in this peripheral cutout. On the basis of this basic principle, a large number of different form-fitting connections can be implemented, which meet the various assembly requirements, but also the operating requirements of the cooking appliance light in a cooking appliance.

The solution of the invention is characterized by a powerless insertion of the fiber optic rod into the receiving socket. The mechanical, form-fitting fixing of the light-conducting rod and also its alignment, if necessary, are only determined by subsequent placement of the spring connector.

• - der Träger mit metallischem Aufnahmestutzen versehen ist
• - das Halteteil eine Haltelasche ist, welche von einer Wand des Aufnahmestutzens ausgebildet ist, indem diese Wand einen U-förmigen Einschnitt aufweist,
• - die Haltelasche, nachdem der Lichtleitstab in den Aufnahmestutzen eingesetzt und mit seinem Umfangsfreischnitt zur Haltelasche orientiert ist, umgeformt, nämlich in Richtung Lichtleitstab umgebogen wird,
• - die Haltelasche in den Freischnitt des Lichtleitstabes eingreift und den Lichtleitstab im Träger hält.

Finally, the object of the invention is also achieved by a method according to claim 2, wherein

• - the carrier is provided with a metal receiving socket
• - the holding part is a holding tab, which is formed by a wall of the receiving socket, in that this wall has a U-shaped incision,
• - After the light-conducting rod has been inserted into the receiving socket and its circumferential cut-out is oriented towards the holding tab, the retaining tab is reshaped, namely bent in the direction of the light-conducting rod,
• - The retaining tab engages in the cut-out of the fiber optic rod and holds the fiber optic rod in the carrier.

This solution offers resistance-free insertion of the fiber optic rod into the mounting socket, where particularly low-force assembly is required. Damage to the light-conducting rod by the holding part while the light-conducting rod is being pushed into the receiving socket is ruled out.

Provision is made for the carrier and the light-conducting rod to have mutually corresponding alignment contours in order to fix the light-conducting rod in the correct position in the carrier, in particular with regard to rotation about its longitudinal central axis.

An embodiment is particularly preferred in which the retaining tab and the peripheral cutout have corresponding alignment contours, which hold the light-conducting rod in the lamp body in a rotationally fixed manner in relation to its longitudinal central axis.

Such an alignment is always necessary when the light guide rod has a dedicated light exit surface that has to point in a specific direction due to the structure of the cooking appliance.

Such alignment contours can consist, for example, of a straight edge of a latching element or a retaining tab on one side, which interacts with a flat, non-curved peripheral surface section of the fiber-optic rod, preferably the peripheral cutout of the fiber-optic rod.

• 1: die Explosionsansicht einer Gargeräteleuchte,
• 2: eine Ausschnittsvergrößerung gemäß Ausschnittskreis Z in 1,
• 3: die zusammengesetzte Gargeräteleuchte gemäß 1 in Seitenansicht,
• 4: eine Schnittdarstellung der Gargeräteleuchte gemäß Schnittlinie A-A in 3,
• 5: eine Schnittdarstellung der Gargeräteleuchte gemäß Schnittlinie B-B in 3,
• 6: die Explosionsdarstellung einer zweiten, erfindungsgemäßen Gargeräteleuchte,
• 7: eine Ausschnittsvergrößerung gemäß Ausschnittskreis X in 6,
• 8: die zusammengesetzte Gargeräteleuchte gemäß 6 in Seitenansicht,
• 9: eine Schnittdarstellung der Gargeräteleuchte gemäß Schnittlinie C-C in 8,
• 10: eine Schnittdarstellung der Gargeräteleuchte gemäß Schnittlinie D-D in 8.

Further features of the invention and its other advantages will now be described using two exemplary embodiments. Show it:

• 1 : the exploded view of a cooking appliance light,
• 2 : a section enlargement according to section circle Z in 1 ,
• 3 : the composite cooking appliance light according to 1 in side view,
• 4 : a sectional view of the cooking appliance light according to section line AA in 3 ,
• 5 : a sectional view of the cooking appliance light according to section line BB in 3 ,
• 6 : the exploded view of a second cooking appliance light according to the invention,
• 7 : a section enlargement according to section circle X in 6 ,
• 8th : the composite cooking appliance light according to 6 in side view,
• 9 : a sectional view of the cooking appliance light according to section line CC in 8th ,
• 10 : a sectional view of the cooking appliance light according to section line DD in 8th .

In the 1 until 5 a first embodiment of a cooking appliance light 10 is shown in which 6 until 10 a second embodiment of a cooking appliance light is shown. Insofar as both embodiments have identical or analogous components, the same reference numbers are used below. Insofar as the embodiments differ, different reference symbols are used and different functions are explained separately.

The cooking appliance lamp of the first embodiment, provided with the reference numeral 10 overall game is now based on the 1 until 5 described.

in the in 1 illustrated exploded view of the cooking appliance light 10, the essential individual components are shown.

The cooking appliance light 10 initially includes a carrier 11, which is usually made of plastic, but can also be made of a different material. The carrier 11 has a receiving socket 12, in which a cylindrical light-conducting rod 13 is inserted in the insertion direction E. For this purpose, the receiving socket 12 has a light rod entry opening 31 which is arranged on a side of the receiving socket facing away from a light source socket 14 .

On the side facing away from the receiving socket 12, the carrier 11 forms a light source receptacle 14, which here is a receptacle open on one side.

The lamp holder 14 carries a lamp 15, which consists here of a circuit board 16 on which at least one LED 17 is arranged, which is supplied with electricity via connecting conductors 18.

The circuit board 16 is attached to a heat sink 19 . Suitable fastening means 20 can be selected for this purpose. For example, screw bolts can be selected here. However, plug-in latching means are preferred which allow the circuit board 16 to be mounted on the heat sink 19 without screws.

The unit consisting of the illuminant 15 and the heat sink 19 is inserted into the illuminant receptacle 14 of the carrier 11 and is also fixed there with a suitable fastening means 20 . Here too, in addition to screw bolts, a plug-in latching means is preferred. However, it is also conceivable that the carrier 11 itself forms latching means, for example in the form of latching projections or latching hooks, which interact with latching projections of the lamp 15 or the heat sink 19 for fixing in the lamp holder 14 .

In the present exemplary embodiment, the light-conducting rod 13 is circular-cylindrical and has a light-supply surface 21 at its end facing the carrier 11, which forms the bottom of the cylinder. On the side facing away from the light input surface 21, the cylinder cover forms a light exit surface 22, the surface of which is spherically curved in order to scatter the light widely.

Variants of fiber optic rods 13 are known in which the light is guided out laterally from the lateral surface. The issue of light emission plays a subordinate role in the core idea of the invention. It is also not necessary for the light-conducting rod 13 to have a circular-cylindrical contour. Other contours are conceivable depending on the specific application of the cooking appliance light.

The cylinder jacket surface 23, also referred to below as the circumferential surface, has a cutout 24, also referred to as the circumferential cutout below. In the first embodiment presented here, it is an annular groove 25.

How from the 1 and 2 shows that the cutout 24 is arranged at a distance from the light feed surface 21 . As a result, the full cross section of the cylindrical fiber optic rod 13 is available for the light feed surface 21 . The cross-sectional reduction caused by the circumferential cutout 24 is at a distance from the light feed surface 21 . This construction has the significant advantage that a large light feed surface 21 is available for feeding light into the light guide rod 13 and the amount of light fed in is not reduced by a reduction in the cross section of the light guide rod 13 in the area of the light feed surface 21 .

In particular from 2 shows that the receiving socket 12 is a hollow-cylindrical body, the inner wall of which carries centering ribs 26 . The jacket wall 27 of the receiving socket 12 is provided with an approximately U-shaped incision 28 . In this way, the casing wall 27 forms a holding part in the form of a detent spring 29 or holding tab 30 , the root of which is located near the light rod entry opening 31 of the receiving socket 12 . the light rod entry opening 31 is arranged at a distance from the illuminant or at the end of the receiving socket 12 which faces away from the illuminant receptacle. In the embodiment according to 2 the detent spring 29 is issued inward in the direction of the hollow-cylindrical receiving space of the receiving socket 12 and thus protrudes into the path of movement of the light-conducting rod 13, on which the light-conducting rod 13 is inserted in the insertion direction E into the receiving socket 12.

3 now shows the cooking appliance light 10 according to FIG 1 in assembled condition. The fiber optic rod 13 sits in the receiving socket 12 of the carrier 11 . The unit consisting of the illuminant 15 and the heat sink 19 is fixed in the illuminant receptacle 14 .

the 5 as a sectional view according to section line BB in 3 shows the hollow-cylindrical receiving socket 12 with its centering ribs 26, which hold the light-conducting rod 13 centered in the receiving socket 12.

Based on 4 , a sectional view according to section line AA in 3 , The determination of the fiber optic rod 13 in the carrier 11 is particularly clear. The sectional view shows how the detent spring 29 of the receiving socket 12 engages in the peripheral cutout 24 of the light-conducting rod 13, designed here as an annular groove 25. The free edge of the detent spring 29 rests against the groove wall near the lamp and thus acts against a pull-out force counteracting the insertion direction E.

When the fiber optic rod 13 is inserted into the hollow-cylindrical receiving space of the receiving socket 12, the detent spring 29 protruding into the movement path of the fiber optic rod is deflected from its rest position and initially slides along the cylinder surface 23 of the fiber optic rod 13. It then slips into the annular groove 25 when it is reached, which can be felt by the fitter during manual assembly, so that he knows about the fastening position of the light-conducting rod 13 and ends the assembly process.

In the case of mechanical assembly, the assembly path to be covered by the light-conducting rod 13 in the insertion direction E is predefined, so that the assembly tool can carry out the corresponding insertion movement.

It is conceivable that the fiber-optic rod 13 and the carrier 11 are provided with corresponding alignment contours. In this way, a defined orientation of the light-conducting rod 13 can be achieved with regard to a rotation about its longitudinal central axis. Such alignment contours can be most easily achieved in the exemplary embodiment according to FIG 1 until 5 by aligning edges or aligning surfaces. For example, the annular groove 25 can have a non-curved, flat surface in one section, in which a straight edge of the free end of the detent spring 29 comes to rest and thus ensures a defined alignment.

It is also conceivable, instead of an annular groove, to provide only a groove section in the cylinder jacket surface 23 of the light-conducting rod 13, the dimensions of which correspond to the detent spring. When the detent spring 29 engages in this groove section, not only is the fastening position of the light-conducting rod 13 in the carrier 11 reached. At the same time, a corresponding orientation is also guaranteed.

Based on 5 until 10 a second embodiment of the invention will now be described. The cooking appliance light 10 there corresponds essentially to the first exemplary embodiment in terms of its construction and its components. To avoid duplication, a basic description of the cooking appliance light 10 according to the second embodiment is dispensed with and the description of the first embodiment in FIGS 1 until 5 referred. Insofar as the drawings bear the same reference symbols, the components correspond accordingly in their function.

The receiving socket 12 of the carrier 11 of the second embodiment differs, in particular from the 1 and 2 shows slightly different from the first embodiment. It is provided with an opening 40 which forms a type of window 41 and allows access to the hollow-cylindrical receiving space of the receiving socket 12 for the light-conducting rod 13 .

The fiber-optic rod 13 has a circumferential cutout 24 in the form of a groove incision 42, which only runs along a short circumferential section. In terms of its dimensions, it corresponds approximately to those of the opening 40. The bottom of the groove incision 42 is kept flat and uncurved.

A detent spring 29 or a retaining clip 30, for example, is not used here as the retaining means, as in the first exemplary embodiment. A spring pin 43, which is bent in a U-shape in the broadest sense, is used as the holding means of the second exemplary embodiment. The spring pin 43 has a latching leg 44 and a holding leg 45 which are connected to one another via a head leg 46 . The free ends of locking leg 44 and holding leg 45 are bent outwards.

The fiber-optic rod 13 is first inserted in the insertion direction E into the hollow-cylindrical receiving socket 12 . Ideally, the peripheral cutout 24 is aligned with the opening 40 or the window 41, although this is not absolutely necessary at this point in time.

The spring pin 43 is now pushed onto the outer circumference of the casing wall 27 of the receiving socket 12 . The exposed free ends of locking leg 44 and holding leg 45 make it easier to push on the spring pin 43, the legs 44, 45 spread under the build-up of spring tension. The latching leg 44 is bent at the front congruently to the contour of the jacket wall 27 of the receiving socket 12, and in the present exemplary embodiment has a section with a circular arc-like curvature. In its installed position, this arcuate section of the latching leg 44 of the spring pin 43 rests against the outer peripheral surface of the jacket wall 27 of the receiving socket 12 and holds the spring pin 43 on the receiving socket 12.

The retaining leg 45 is unge in the embodiment with the exception of its free end executed curved and lies with a section in the opening 40 a. If this has not already been done, the fiber-optic rod 13 is now to be rotated about its longitudinal center axis in the receiving socket 12 in order to align the notch 42 with the opening 40 and with the retaining leg 45 lying there. The holding leg 45 then engages in the notch 42 . Its flat, uncurved bottom surface is in full contact with the uncurved holding leg 45 so that, in addition to being held against the direction of insertion E, a defined alignment of the light-conducting rod 13 is also specified.

A further embodiment, which is not shown and is not covered by the invention, of a form-fitting fixing of the light-conducting rod 13 in the carrier 11 can take place, for example, by means of a locking ring. Here the locking ring could rest in an inner peripheral groove of the jacket wall 27 of the receiving socket 12 . Compared to the outer circumference of the light-conducting rod 13, this retaining ring is made undersized. The light-conducting rod 13 has a peripheral cut-out, in which the securing ring engages in order to hold the light-conducting rod 13 in the carrier 11 .

Reference List

10

cooking appliance light

11

carrier

12

intake socket

13

fiber optic rod (cylindrical)

14

bulb holder

15

bulbs

16

circuit board

17

LEDs

18

connection conductor

19

heatsink

20

fasteners

21

Light input surface / cylinder base

22

Light exit surface / cylinder ceiling

23

Cylinder surface / peripheral surface

24

Relief / perimeter relief

25

ring groove

26

centering ribs

27

coat wall

28

incision

29

detent spring

30

retaining tab

31

light wand entry port

40

breakthrough

41

window

42

groove incision

43

spring pin

44

locking leg

45

holding leg

46

head thighs

E

insertion direction

Claims (3)

Cooking appliance lamp (10) - with a carrier (11) which forms a lamp holder (14), in which a lamp (15) in the form of a circuit board (16) with at least one LED sits and has a receiving socket (12) which has a opening is connected to the receptacle for the illuminant (15), - with a light-conducting rod (13) which sits in the receptacle socket (12) and into which the light emitted by the illuminant (15) passes through the opening between the receptacle socket (12) and the illuminant receptacle (14) is fed in, with - the light-conducting rod (13) being fixed in the carrier (11) by means of a form-fitting connection, - the form-fitting connection of a holding part on the side of the carrier (11) and a circumferential cutout (24) on the side of the light-conducting rod (13) is formed, wherein the holding part for fixing the light-conducting rod (13) on the carrier (11) engages in the peripheral cut-out (24), characterized in that - the receiving socket (12) for the light-conducting rod (13) is in the peripheral wall has an opening (40) and - the holding part is formed by a spring pin (43) which can be placed on the outer circumference of the receiving socket (12) and has at least one holding leg (45), - the spring pin (43) passing through the opening (40) in engages with the opening (40) aligned peripheral cut (24) of the fiber optic rod (13). Method for installing a light-conducting rod (13) in a cooking appliance light (10) with the features of the preamble of claim 1 , wherein - the carrier (11) is provided with a metal receiving piece (12) - the holding part is a holding tab (30) which is formed by a wall of the receiving piece (12) by this wall having a U-shaped incision (28). - The retaining tab (30) after the fiber optic rod (13) is inserted into the receiving socket (12) and is oriented with its peripheral cutout (24) to the retaining lug (30), reshaped, namely bent in the direction of the light-conducting rod (13), - the retaining lug (30) engages in the cut-out (24) of the light-conducting rod (13) and the light-conducting rod (13) in the carrier (11) holds. Cooking appliance lamp (10) after claim 1 , characterized in that the peripheral cut-out (24) of the light-conducting rod (13) is arranged at an axial distance from an end face of the light-conducting rod (13) serving to introduce light.

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