MOUNTING PART FOR A HOUSING AND HOUSING FOR A FIELD DEVICE

Description

[0001] The invention relates to a fastening part for a housing and a housing for a field device.

[0002] In analytical measurement technology, particularly in water management, environmental analysis, and industrial applications such as food technology, biotechnology, and pharmaceuticals, as well as for a wide variety of laboratory applications, enclosures are used to protect electronic components from environmental influences. Since maintenance or, if necessary, repair of the electronic components must be possible, the enclosure must be accessible to the user. At the same time, however, it must also be possible to securely reclose the enclosure. For this purpose, the enclosure consists of a body and a lid. The lid is usually attached to the body using screws.

[0003] However, the use of screws has the disadvantage of making maintenance more complicated, as the screws must be removed individually using tools. Furthermore, removed screws can easily be lost, posing an additional safety risk to the industrial plant where the field device is used.

[0004] Document US 2018 / 299370 A1 describes a mounting part for a housing with a bayonet fitting.

[0005] It is therefore an object of the invention to provide a housing for a field device which enables comfortable and safe handling.

[0006] This problem is solved according to the invention by a fastening part for a cover on a housing according to claim 1.

[0007] The fastening element according to the invention is ring-shaped and extends around a longitudinal axis. The fastening element has a first rim and a second rim opposite the first rim. The first rim has at least two bayonet slots suitable for attaching the fastening element to the housing. The bayonet slots extend along the longitudinal axis and transversely around the longitudinal axis. Each bayonet slot has an inlet, a rib, a stop, and a slot bottom with a defined depth. The stop limits the extension of the bayonet slots around the longitudinal axis. The rib is arranged between the inlet and the stop on the slot bottom and extends radially from the slot bottom to the longitudinal axis with a predetermined height.

[0008] The fastening element according to the invention makes it possible to provide a convenient and secure fastening element for a housing. The fastening element does not use screws, but rather eliminates the need for separate locking devices. Furthermore, the fastening element is robust because the retaining elements required for closure are arranged in such a way that they cannot break off. According to one embodiment of the invention, the rib extends around the longitudinal axis and has a first rib end and a second rib end. The first rib end has a first rib chamfer, and the second rib end has a second rib chamfer.

[0009] According to one embodiment of the invention, the fastening part comprises an elastic material.

[0010] According to one embodiment of the invention, the bayonet slot has a longitudinal groove and a transverse groove. The transverse groove runs parallel or obliquely to the first edge.

[0011] According to one embodiment of the invention, the bayonet slots, together with the inlet and the stop, define a central angle between 10° and 150° on the longitudinal axis.

[0012] According to one embodiment of the invention, the fastening part has at least one first bayonet slot and a second bayonet slot opposite the first bayonet slot on the fastening part.

[0013] According to the claimed invention, the second edge has a projection which extends radially towards the longitudinal axis.

[0014] The above-mentioned problem is further solved by a housing for a field device according to claim 7.

[0015] The housing according to the invention comprises: A fastening element according to the invention, a cylindrical housing body extending about the longitudinal axis and having a housing rim with at least two bayonet teeth extending radially to the longitudinal axis. The bayonet teeth are complementary to the bayonet grooves. The bayonet teeth have a first tooth end and a second tooth end. A first tooth chamfer is arranged at the first tooth end and a second tooth chamfer at the second tooth end, and / or a first rib chamfer is arranged at the first rib end and a second rib chamfer is arranged at the second rib end, or At the first tooth end, there is a first tooth chamfer, and at the second rib end, there is a second rib chamfer; or at the first rib end, there is a first rib chamfer, and at the second tooth end, there is a second tooth chamfer. The ribs and bayonet teeth are designed to engage with each other when the bayonet teeth are moved in the bayonet slots.

[0016] According to one embodiment of the invention, the first tooth end and the second tooth end define a tooth length, and the second rib end and the stop define a rib-stop length. The tooth length and the rib-stop length are identical, so that the bayonet tooth is suitable for engaging between the rib and the stop.

[0017] According to one embodiment of the invention, the first rib end and the second rib end define a rib length, and the bayonet tooth has a recess which is arranged between the first tooth end and the second tooth end and has a recess length, wherein the recess length and the rib length are identical, so that the rib is suitable to engage in the recess.

[0018] The invention is explained in more detail with reference to the following description of figures. The figures show: Fig. 1: a perspective view of the fastening part according to the invention; Fig. 2 : a sectional view of a field device with a housing according to the invention and the mounting part made of Figure 1 ; Fig. 3 : an enlarged view of a section from Figure 2 with the mounting part and the housing; Fig. 4 : a perspective view of a section of the fastening part made of Figure 3 ; Fig. 5 : a perspective view of a field device with the mounting part and the housing; and Fig. 6 : a perspective view of a field device with its housing.

[0019] Figure 1 Figure 1 shows a fastening part 10 according to the invention for a housing 1 of a field device. An exemplary field device with housing 1 and fastening part 10 is shown in Figure 1. Figure 5 depicted.

[0020] The fastening element 10 is ring-shaped or sleeve-shaped and extends around a longitudinal axis A1. The fastening element 10 has a first rim 11 and a second rim 12 opposite the first rim 11. The first rim 11 has at least two bayonet slots 20, 200, which are suitable for attaching the fastening element 10 to the housing 1. The second rim 12 preferably has a projection 13, which extends radially to the longitudinal axis A1. The projection 13 preferably extends inwards towards the fastening element 10, i.e., towards the longitudinal axis A1. The projection 13 is suitable for holding a cover 60 on the housing body 40. According to an alternative embodiment, the fastening element 10 is cup-shaped, so that the housing 1 is closed after connecting the fastening element 10 and the housing body 40 (not shown).The fastening element 10 is made of an elastic material, or at least comprises an elastic material, so that the fastening element 10 is elastically deformable. The fastening element 10 is, for example, made of plastic.

[0021] For the sake of simplicity, identical elements that occur multiple times will be described in the singular only, even if multiple elements are meant. This is indicated by the use of multiple reference symbols, e.g., 20 and 200.

[0022] The bayonet slot 20, 200 each has an inlet 21, 221, a rib 30, 300, a stop 22, 222 and a slot bottom 23, 223 with a slot depth T1, T2 (see Figures 1 to 4 ).

[0023] The bayonet slot 20, 200 is preferably located on the inside of the mounting part 10, i.e., facing the longitudinal axis A1. However, it is also possible to arrange the bayonet slot 20, 200 on the outside of the mounting part 10, i.e., on a side of the mounting part 10 facing away from the longitudinal axis A1. The bayonet slot 20, 200 extends along the longitudinal axis A1 and transversely to the longitudinal axis A1 around the longitudinal axis A1. As shown in Figure 1As shown, the bayonet groove 20, 200 has a longitudinal groove 24, 224 and a transverse groove 25, 225. The transverse groove 25, 225 runs parallel or at an angle to the first edge 11. A transverse groove 25 running at an angle to the first edge 11 has the advantage that, if a sealing ring is arranged between the fastening part 10 and a housing body 40, the sealing ring can be subjected to contact pressure when the fastening part 10 is fastened to the housing body 40. The bayonet groove 20, 200, together with the inlet 21, 221 and the stop 22, 222, defines a central angle MW1, MW2 between 10° and 150° on the longitudinal axis A1 (see Figure 2 If the bayonet slot 20, 200 extends only over a short section along the mounting part 10, for example a section which spans a central angle of 10°, then a large number of bayonet slots can be provided along the mounting part 10.

[0024] Figure 2shows an embodiment with two bayonet slots 20, 200, which are arranged opposite each other on the fastening part 10.

[0025] The stop 22, 222 limits the bayonet groove 20, 200 in its extension around the longitudinal axis A1. The stop 22, 222 thus forms the end of the channel formed by the bayonet groove 20, 200. The stop 22, 222 forms a wall to the groove bottom 23, 223. The stop 22, 222 has, for example, a flank, which in Figure 4 is shown in detail. Alternatively, the stop 22, 222 is arranged, for example, at 90° or at another angle to the groove base 23, 223 (not shown).

[0026] The rib 30, 300 extends around the longitudinal axis A1 and has a first rib end 31, 331 and a second rib end 32, 332 (see Figure 4 The rib 30, 300 is arranged between the inlet 21, 221 and the stop 22, 222 on the groove bottom 23, 223 (see Figure 2The rib 30, 300 extends radially from the groove base 23, 223 to the longitudinal axis A1 with a predetermined rib height RH1, RH2. The rib height RH1, RH2 is less than the groove depth T1, T2 of the bayonet groove 20, 200. The rib height RH1, RH2 is, for example, between 1 mm and 5 mm. The first rib end 31, 331 and the second rib end 32, 332 define a rib length RL1, RL2.

[0027] The first rib end 31, 331 preferably has a first rib chamfer 33, 333 and the second rib end 32, 332 preferably has a second rib chamfer 34, 334. The rib chamfers 33, 34, 333, 334 have, for example, an inclination of between 10° and 60° relative to the groove bottom 23, 223.

[0028] The housing 1 comprises the fastening part 10 described above and a cylindrical or pot-shaped housing body 40 (see Figure 5 ).

[0029] The housing body 40 extends around the longitudinal axis A1 and has a housing edge 41, which has at least two bayonet teeth 50, 500, each extending radially to the longitudinal axis A1 (see Figure 6 ).

[0030] The bayonet tooth 50, 500 preferably extends away from the longitudinal axis A1, i.e., outwards from the housing body 40. The bayonet tooth 50, 500 has a tooth height ZH1, ZH2. The tooth height ZH1, ZH2 is preferably less than the groove depth T1, T2. The bayonet tooth 50, 500 is designed such that it can be inserted into the bayonet groove 20, 200. If the bayonet groove 20, 200 is located on the outside of the mounting part 10, the bayonet tooth 50, 500 is oriented towards the inside of the housing body 40, i.e., towards the longitudinal axis A1.

[0031] The bayonet tooth 50, 500 is complementary to the bayonet groove 20, 200. This means that the rib 30, 300 and the bayonet tooth 50, 500 interlock in such a way that the fastening part 10 can be attached to the housing body 40. The fastening part 10 is thus held in a closed position on the housing body 40 by the rib 30, 300 and the bayonet tooth 50, 500. For this purpose, the bayonet tooth 50, 500 is inserted into the bayonet groove 20, 200 and moved until the bayonet tooth 50, 500 and the rib 30, 300 interlock.

[0032] The rib 30, 300 and the bayonet tooth 50, 500 are designed to come into contact with each other when the bayonet tooth 50, 500 is moved relative to the rib 30, 300 in the bayonet grooves 20, 200. When the bayonet tooth 50, 500 is moved relative to the rib 30, 300, it can become entangled between the bayonet tooth and the rib. For this reason, it is advantageous to provide chamfers on the bayonet tooth and / or on the rib, as described below.

[0033] The bayonet tooth 50, 500 has a first tooth end 51, 551 and a second tooth end 52, 552. As in Figure 3 As can be seen in one embodiment, a first tooth chamfer 53, 553 is provided at the first tooth end 51, 551 and a second tooth chamfer 54, 554 is provided at the second tooth end 52, 552. The tooth chamfers enable the rib to move in the bayonet groove relative to the bayonet tooth with minimal snagging when the fastening part 10 is moved.

[0034] As in Figure 3 and Figure 4As can be seen, according to an embodiment compatible with the aforementioned embodiments, a first rib chamfer 33, 333 is arranged at the first rib end 31, 331 and a second rib chamfer 34, 334 is arranged at the second rib end 32, 332. If the rib has rib chamfers in addition to the bayonet tooth, an entanglement between the rib and the bayonet tooth can be avoided.

[0035] It is therefore advantageous if either the rib has two rib chamfers or the bayonet tooth has two tooth chamfers. Ideally, the rib has two rib chamfers and the bayonet tooth has two tooth chamfers.

[0036] According to an alternative embodiment, the bayonet tooth 50, 500 has a first tooth chamfer 53, 553 at the first tooth end 51, 551, and the rib 30, 300 has a second rib chamfer 34, 334 at the second rib end 32, 332. Thus, during relative movement between the rib 30, 300 and the bayonet tooth 50, 500 in both directions of movement along the bayonet groove 20, 200, at least one chamfer is present, which prevents the rib 30, 300 and the bayonet tooth 50, 500 from engaging.

[0037] According to an alternative embodiment, the rib 30, 300 has a first rib chamfer 33, 333 at its first rib end 31, 331, and the bayonet tooth 50, 500 has a second tooth chamfer 54, 554 at its second tooth end 52, 552. Thus, during relative movement between the rib 30, 300 and the bayonet tooth 50, 500 in both directions of movement along the bayonet groove 20, 200, at least one chamfer is present, which prevents the rib 30, 300 and the bayonet tooth 50, 500 from engaging.

[0038] In Figure 3 The interaction between bayonet nut 20, 200 and bayonet tooth 50, 500 is shown in detail.

[0039] The first tooth end 51, 551 and the second tooth end 52, 552 define a tooth length ZL1, ZL2. The second rib end 32, 332 and the stop 22, 222 define a rib stop length RA1, RA2. The tooth length ZL1, ZL2 and the rib stop length RA1, RA2 are preferably identical, so that the bayonet tooth 50, 500 is suitable for engaging between the rib 30, 300 and the stop 22, 222.

[0040] According to an optional embodiment, which is described in the Figure 2 , 3 and 6As shown, and compatible with all described embodiments, the bayonet tooth 50, 500 has a recess 55, 555 which is arranged between the first tooth end 51, 551 and the second tooth end 52, 552. The recess 55, 555 has a recess length AL1, AL2. The recess length AL1, AL2 and the rib length RL1, RL2 are preferably identical, so that the rib 30, 300 is suitable to engage in the recess 55, 555.

[0041] As in Figure 5As can be seen, the housing 1 optionally has a cover 60, which is suitable for being attached to the housing body 40 by means of the fastening part 10. The cover 60 has an edge 61 which is suitable for engaging in the projection 13 of the fastening part 10. This allows the fastening part 10 to attach the cover 60 to the housing body 40. A seal 62, for example a sealing ring, is preferably arranged between the cover 60 and the housing body 40. When the fastening part 10 is connected to the housing body 40, a clamping force is exerted by the fastening part 10 on the cover 60 thanks to the angled bayonet groove 20, 200, which compresses the sealing ring.

[0042] In an alternative embodiment, the fastening part 10 is formed in one piece with the cover 60 (not shown). Reference symbol list

[0043] 1 Housing 10 Fastening part 11 First edge 12 Second edge 13 Projection 20first bayonet groove 21inlet 22stop 23groove bottom 24longitudinal groove 25transverse groove 30 Rib 31 First rib end 32 Second rib end 33 First rib chamfer 34 Second rib chamfer 40 Housing body 41 Housing edge 50 first bayonet tooth 51 first tooth end 52 second tooth end 53 first tooth chamfer 54 second tooth chamfer 55 recess 60 Cover 61 Edge 62 Seal 200 Second bayonet groove 221 Inlet 222 Stop 223 Groove bottom 224 Longitudinal groove 225 Transverse groove 300 Rib 331 First rib end 332 Second rib end 333 First rib chamfer 334 Second rib chamfer 500 second bayonet tooth 551 first tooth end 552 second tooth end 553 first tooth chamfer 554 second tooth chamfer 555 recess A1 Longitudinal axis AL1, AL2 Recess length MW1, MW2 Center angle RL1, RL2 Rib length RH1, RH2 Rib height T1, T2 Groove depth ZL1, ZL2 Tooth length ZH1, ZH2 Tooth height

Claims

1. Fastening element (10) for a cover (60) on a housing (1), wherein the fastening element (10) is annular and extends around a longitudinal axis (A1), wherein the fastening element (10) has a first edge (11) and a second edge (12) opposite the first edge (11), wherein the first edge (11) has at least two bayonet grooves (20, 200), wherein the bayonet grooves (20, 200) extend along the longitudinal axis (A1) and transversely to the longitudinal axis (A1) around the longitudinal axis (A1), wherein the bayonet grooves (20, 200) each have an inlet (21, 221), a rib (30, 300), a stop (22, 222) and a groove base (23, 223) with a groove depth (T1, T2), wherein the stop (22, 222) limits the bayonet grooves (20, 200) in their extension around the longitudinal axis (A1), wherein the rib (30, 300) is arranged between the inlet (21, 221) and the stop (22, 222) on the groove base (23, 223) and extends from the groove base (23, 223) radially to the longitudinal axis (A1) with a predetermined height (H1, H2), characterized in that the second edge (12) has a projection (13) which extends radially towards the longitudinal axis (A1).

2. Fastening element (10) according to claim 1, wherein the rib (30, 300) extends around the longitudinal axis (A1) and has a first rib end (31, 331) and a second rib end (32, 332), wherein the first rib end (31, 331) has a first rib chamfer (33, 333) and the second rib end (32, 332) has a second rib chamfer (34, 334).

3. Fastening element (10) according to one of the preceding claims, wherein the fastening element (10) comprises an elastic material.

4. Fastening element (10) according to one of the preceding claims, wherein the bayonet groove (20, 200) has a longitudinal groove (24, 224) and a transverse groove (25, 225), wherein the transverse groove (25, 225) runs parallel or obliquely to the first edge (11).

5. Fastening element (10) according to one of the preceding claims, wherein the bayonet grooves (20, 200) each define a center angle (MW1, MW2) between 10° and 150° on the longitudinal axis (A1).

6. Fastening element (10) according to one of the preceding claims, wherein the fastening element (10) has at least one first bayonet groove (20) and a second bayonet groove (200) opposite the first bayonet groove (20) on the fastening element (10).

7. Housing (1) for a field device, comprising: - a fastening element (10) according to one of the preceding claims, - a cylindrical housing body (40) which extends around the longitudinal axis (A1) and has a housing edge (41) which has at least two bayonet teeth (50, 500) which each extend radially to the longitudinal axis (A1), wherein the bayonet teeth (50, 500) are each complementary to the bayonet grooves (20, 200), wherein the bayonet teeth (50, 500) have a first tooth end (51, 551) and a second tooth end (52, 552), wherein a first tooth chamfer (53, 553) is arranged at the first tooth end (51, 551) and a second tooth chamfer (54, 554) and / or a first rib chamfer (33, 333) is arranged at the second tooth end (52, 552) and at the first rib end (31, 331), (33, 333) is arranged on the first rib end (31, 331) and a second rib chamfer (34, 334) is arranged on the second rib end (32, 332), or wherein a first tooth chamfer (53, 553) is arranged at the first tooth end (51, 551) and a second rib chamfer (34, 334) is arranged at the first rib end (31, 331) and a second tooth chamfer (54, 554) is arranged at the second tooth end (52, 552), wherein the ribs (30, 300) and the bayonet teeth (50, 500) are adapted to come into contact with each other when the bayonet teeth (50, 500) are moved in the bayonet grooves (20, 200).

8. Housing (1) according to claim 7, wherein the first tooth end (51, 551) and the second tooth end (52, 552) define a tooth length (ZL1, ZL2) and the second rib end (32, 332) and the stop (22, 222) define a rib stop length (RA1, RA2), wherein the tooth length (ZL1, ZL2) and the rib stop length (RA1, RA2) are identical, so that the bayonet tooth (50, 500) is suitable for engaging between the rib (30, 300) and the stop (22, 222).

9. Housing (1) according to claim 7 or 8, wherein the first rib end (31, 331) and the second rib end (32, 332) define a rib length (RL1, RL2) and the bayonet tooth (50, 500) has a recess (55, 555) which is arranged between the first tooth end (51, 551) and the second tooth end (52, 552) and has a recess length (AL1, AL2), wherein the recess length (AL1, AL2) and the rib length (RL1, RL2) are identical, so that the rib (30, 300) is suitable for engaging in the recess (55, 555).