GB1575428A - Method of manufacturing housings for electrical devices - Google Patents

Method of manufacturing housings for electrical devices Download PDF

Info

Publication number
GB1575428A
GB1575428A GB53333/77A GB5333377A GB1575428A GB 1575428 A GB1575428 A GB 1575428A GB 53333/77 A GB53333/77 A GB 53333/77A GB 5333377 A GB5333377 A GB 5333377A GB 1575428 A GB1575428 A GB 1575428A
Authority
GB
United Kingdom
Prior art keywords
impression
base
wall
plastics material
housing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB53333/77A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of GB1575428A publication Critical patent/GB1575428A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
    • B29C59/02—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/02—Bending or folding
    • B29C53/04—Bending or folding of plates or sheets
    • B29C53/06—Forming folding lines by pressing or scoring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
    • B29C37/0053—Moulding articles characterised by the shape of the surface, e.g. ribs, high polish
    • B29C37/0057—Moulding single grooves or ribs, e.g. tear lines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/40—Shaping or impregnating by compression not applied
    • B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
    • B29C70/46—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
    • B29L2031/3055—Cars
    • B29L2031/3061—Number plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/44—Furniture or parts thereof
    • B29L2031/445—Cabinets

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casings For Electric Apparatus (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Description

(54) METHOD OF MANUFACTURING HOUSINGS FOR ELECTRICAL DEVICES (71) We, SIEMENS AKTIENGESELL SCHAFT, a German company, of Berlin and Munich, Germany (Fed. Rep.) do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: The invention relates to a method of manufacturing housings for electrical devices.
Various methods of manufacturing impressions for lead apertures in housings for electrical devices are already known.
Housings for electrical devices may be produced from thermosetting moulding compounds, the wall of these housings being reinforced with textile or wood fibres. Lead-in apertures may be made in the housing walls by drilling, milling or other means. Such procedures are not always possible at the installation site, and are, in any case, costly. These housings may also be provided with impressions for leadin apertures. Owing to the very thin bases of the impressions, a slight blow is sufficient to break out the wall portions defined by the impressions for the purpose of producing the lead-in apertures. However, wall portions may also be broken out by unintentional impacts or blows, whereby the housings may be rendered unserviceable.
It is also known to produce housings for electrical devices from thermoplastics and also to pre-form the walls of these housings with impressions in preparation for the formation of the lead-in apertures.
Owing to the lack of reinforcement and also owing to the excessively thin bases of the impressions, it is here again possible that the wall portions defined by the impressions may themselves be broken out due to unintentional blows or impacts, and that the housing will thus become unserviceable.
Finally, it is known to form housings for electrical devices from the outset with apertures which are adapted to the particular requirements. However, this necessitates keeping a large stock of housings.
According to the present invention, there is provided a method of manufacturing an impression for a lead aperture in the wall of a housing for an electrical device, said housing wall comprising a thermosetting plastics material reinforced with glass fibre mats, wherein the impression for the lead aperture is pressed into the housing wall while the thermosetting plastics material is still readily deformable, thus compressing the glass-fibre mats in the base of the impression and forcing a greater part of the plastics material previously - associated therewith out of the said base.
The use of reinforcing glass-fibre mats in the walls helps to prevent accidental breakage around the impressions.
Plastics material pressed out of the bases of the impressions flows into the housing wall and increases their fluid-tightness and strength.
For a better understanding of the present invention, and to show how the same may be carried into effect, reference will now be made, by way of example, to the accompanying drawing in which the single figure shows an axial vertical section of a wall of a housing.
In the drawing there is shown a housing wall 1 produced by pressing a thermosetting plastics material. The wall 1 is reinforced by glass fibre mats 2, which are embedded in the thermosetting plastics material.
While the thermosetting plastics material is still readily deformable an initial impression 3 for a lead-in aperture is formed in the housing wall 1 by means of a lateral compression member (not shown). The glass fibre mats 2 are compressed in the base of the initial impression 3, substan tially as illustrated, and a greater part of the plastics material is pressed out of the said base leaving a residue which can be cut out later together with the glass fibre mats 2.
The base of the initial impression 3 is resistant to impacts and shock owing to the plastics material which has remained therein, and owing to the compressed glass fibre mats 2. However, a lead-in aperture can be readily formed in the housing wall 1 at any time by cutting out the base of the initial impression. Suitable cutting tools such as knives are usually readily available.
The impression is bounded by a wall 3a which is directed perpendicularly to the base of the initial impression, and by a wall 3b inclined to the base of the impression such that the impression is narrower at its base than its top. Hence, when a cutting tool is applied to the base of the initial impression it should not become jammed between the walls 3a and 3b.
The right-angle between the wall 3a and the base is retained even after a lead-in opening has been made, while the associated wall 3b is situated on the removed wall portion. The oblique edge of the removed wall portion in contrast to the walls which remain in the housings, does not then interfere with travel of the cutting -WHAT WE CLAIM IS: - 1. A method of manufacturing an impression for a lead aperture in the wall of a housing for an electrical device, said housing wall comprising a thermosetting plastics material reinforced with glass fibre mats, wherein the impression for the lead aperture is pressed into the housing wall while the thermosetting plastics material is still readily deformable, thus compressing the glass-fibre mats in the base of the impression and forcing a greater part of the plastics material previously associated therewith out of the said base.
2. A method as claimed in claim 1, wherein the impression is bounded by a first lateral wall substantially perpendicular to the base of the impression' and an opposite wall inclined to the base of the impression such that the impression is narrower at its base than at its top.
3. A method as claimed in claim 1 or 2, wherein an additional step is carried out whereby the compressed glass fibre mats the base of the impression are cut out to and remaining plastics material forming the base of the impression are cut out to form the lead aperture.
4. A method of manufacturing an impression for a lead aperture in a housing for an electrical device, substantially as hereinbefore described with reference to the accompanying drawing.
5. A housing for an electrical device having an impression for a lead aperture whenever produced by the method claimed in any one of the preceding claims.
HASELTINE, LAKE & CO.,
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (5)

  1. **WARNING** start of CLMS field may overlap end of DESC **.
    tially as illustrated, and a greater part of the plastics material is pressed out of the said base leaving a residue which can be cut out later together with the glass fibre mats 2.
    The base of the initial impression 3 is resistant to impacts and shock owing to the plastics material which has remained therein, and owing to the compressed glass fibre mats 2. However, a lead-in aperture can be readily formed in the housing wall 1 at any time by cutting out the base of the initial impression. Suitable cutting tools such as knives are usually readily available.
    The impression is bounded by a wall 3a which is directed perpendicularly to the base of the initial impression, and by a wall 3b inclined to the base of the impression such that the impression is narrower at its base than its top. Hence, when a cutting tool is applied to the base of the initial impression it should not become jammed between the walls 3a and 3b.
    The right-angle between the wall 3a and the base is retained even after a lead-in opening has been made, while the associated wall 3b is situated on the removed wall portion. The oblique edge of the removed wall portion in contrast to the walls which remain in the housings, does not then interfere with travel of the cutting -WHAT WE CLAIM IS: - 1. A method of manufacturing an impression for a lead aperture in the wall of a housing for an electrical device, said housing wall comprising a thermosetting plastics material reinforced with glass fibre mats, wherein the impression for the lead aperture is pressed into the housing wall while the thermosetting plastics material is still readily deformable, thus compressing the glass-fibre mats in the base of the impression and forcing a greater part of the plastics material previously associated therewith out of the said base.
  2. 2. A method as claimed in claim 1, wherein the impression is bounded by a first lateral wall substantially perpendicular to the base of the impression' and an opposite wall inclined to the base of the impression such that the impression is narrower at its base than at its top.
  3. 3. A method as claimed in claim 1 or 2, wherein an additional step is carried out whereby the compressed glass fibre mats the base of the impression are cut out to and remaining plastics material forming the base of the impression are cut out to form the lead aperture.
  4. 4. A method of manufacturing an impression for a lead aperture in a housing for an electrical device, substantially as hereinbefore described with reference to the accompanying drawing.
  5. 5. A housing for an electrical device having an impression for a lead aperture whenever produced by the method claimed in any one of the preceding claims.
    HASELTINE, LAKE & CO.,
GB53333/77A 1976-12-21 1977-12-21 Method of manufacturing housings for electrical devices Expired GB1575428A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2657959A DE2657959C3 (en) 1976-12-21 1976-12-21 Process for the production of housings for electrical devices

Publications (1)

Publication Number Publication Date
GB1575428A true GB1575428A (en) 1980-09-24

Family

ID=5996139

Family Applications (1)

Application Number Title Priority Date Filing Date
GB53333/77A Expired GB1575428A (en) 1976-12-21 1977-12-21 Method of manufacturing housings for electrical devices

Country Status (6)

Country Link
BE (1) BE861995A (en)
DE (1) DE2657959C3 (en)
FI (1) FI65882C (en)
GB (1) GB1575428A (en)
IT (1) IT1088999B (en)
SE (1) SE7713626L (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8790564B2 (en) 2010-07-15 2014-07-29 Airbus Operations (Sas) Fabrication method of composite components and thus obtained components

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022058702A1 (en) * 2020-09-18 2022-03-24 Imperial College Innovations Limited Method of manufacturing fibre reinforced composite structures

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2033509A1 (en) * 1970-07-07 1972-01-13 Lindner Gmbh Closing flange for housings with side openings

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8790564B2 (en) 2010-07-15 2014-07-29 Airbus Operations (Sas) Fabrication method of composite components and thus obtained components

Also Published As

Publication number Publication date
FI773641A (en) 1978-06-22
IT1088999B (en) 1985-06-10
FI65882C (en) 1984-07-10
SE7713626L (en) 1978-06-22
DE2657959C3 (en) 1982-12-02
BE861995A (en) 1978-04-14
DE2657959B2 (en) 1980-10-09
DE2657959A1 (en) 1978-06-22
FI65882B (en) 1984-03-30

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee