GB705382A - Method of manufacturing plastic typewriter keys - Google Patents

Method of manufacturing plastic typewriter keys

Info

Publication number
GB705382A
GB705382A GB1691/51A GB169151A GB705382A GB 705382 A GB705382 A GB 705382A GB 1691/51 A GB1691/51 A GB 1691/51A GB 169151 A GB169151 A GB 169151A GB 705382 A GB705382 A GB 705382A
Authority
GB
United Kingdom
Prior art keywords
piston
block
key
moulded
thermoplastic material
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
GB1691/51A
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.)
ROOY
Original Assignee
ROOY
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 ROOY filed Critical ROOY
Publication of GB705382A publication Critical patent/GB705382A/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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • 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
    • B29L2031/46—Knobs or handles, push-buttons, grips
    • B29L2031/466—Keypads, keytops
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2221/00—Actuators
    • H01H2221/07—Actuators transparent
    • H01H2221/0702—Transparent key containing three dimensional (3D) element

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Input From Keyboards Or The Like (AREA)

Abstract

705,382. Typewriters &c. ROOY. Jan. 23, 1951 [Jan. 24, 1950], No. 1691/51. Class 100 (4). [Also in Group V] Key construction.-A typewriter key comprises a block of thermosetting plastic material of one colour, formed with a head portion and a shank portion, the head portion being perforated according to the contour of the letter or sign which is to appear on the top surface of the key whilst the shank portion is hollowed out and formed with a relatively small lateral channel, these hollow portions and channel being filled with thermoplastic material of another colour, except for a cavity left in the shank portion for receiving the end of the corresponding typewriter key lever. The hollow shank of the thermosetting block 13 is moulded (see Group V) between the wall of a chamber 16, Fig. 1, and a piston 2, and the lateral channel is formed by a side pin 3. The head of the thermosetting block is moulded between the top of the piston 2 and the bottom of a moulding piston 5, the cavity in the bottom of the moulding piston being engraved according to the character required. The moulded block 13 is then placed in a mould for the thermoplastic material, Fig. 4, the block being upside down with its " top " resting on the top surface of a piston 14. In the top of the mould is a piston 12, the lower end of which has the same dimensions as the typewriter key lever for which the key is intended. The different coloured thermoplastic material is then injected through a runner 15 and the lateral channel.
GB1691/51A 1950-01-24 1951-01-23 Method of manufacturing plastic typewriter keys Expired GB705382A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR705382X 1950-01-24

Publications (1)

Publication Number Publication Date
GB705382A true GB705382A (en) 1954-03-10

Family

ID=9067133

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1691/51A Expired GB705382A (en) 1950-01-24 1951-01-23 Method of manufacturing plastic typewriter keys

Country Status (1)

Country Link
GB (1) GB705382A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1418602A1 (en) * 2002-11-07 2004-05-12 Rafi GmbH & Co. KG, Elektrotechnische Spezialfabrik Layered keyboard

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1418602A1 (en) * 2002-11-07 2004-05-12 Rafi GmbH & Co. KG, Elektrotechnische Spezialfabrik Layered keyboard

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