Patent
1982-06-04
1984-06-26
Pitts, Harold I.
179179, H04M 103
Patent
active
044567944
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a fastening arrangement to keep together the parts of a handset consisting of two case halves.
DESCRIPTION OF PRIOR ART
It is previously known to construct handsets consisting of two case halves, a lower case part and an upper case part, which are kept together by means of screws in the hand gripping part. When mounting, the microphone and the telephone receiver are placed in the lower part, the upper case half being hooked at one of the short ends of the lower part and the screws in the hand gripping part being tightened, whereby the two case halves are pressed towards each other. By tightening the screws the microphone and the telephone receiver are also pressed against the bottom of the lower part by means of clamping rings or straps. Depending on the distance between the fastening screws and the end of the case where the halves are to be pressed together, bending strains with associated cracks can arise.
SUMMARY OF THE INVENTION
An object of the invention is to provide an arrangement eliminating the mentioned bending strains by firmly keeping together the remote ends of the case halves.
In accordance with the above and further object of the invention, a clamping means is provided for engaging upper and lower case parts of a telephone receiver to press the parts together upon tightening of a fastening means while concurrently pressing a microphone and/or a telephone receiver against the lower case part.
The clamping means includes a clamping body acted on by the fastening means during tightening thereof so as to be displaced from an initial position to a displaced position.
The clamping body has a sliding surface which rides on a support on one of the case parts during tightening of the fastening means Additionally, the clamping body has projections spaced from the sliding surface which are moved along a diagonal path as the clamping body travels to its displaced position to engage flanges on the upper case part to clamp the case parts together when the clamping body has been moved to its displaced position.
The clamping body further includes a projection for pressing the microphone and/or receiver against the lower case part when the clamping body has been moved to its displaced position in concurrence with the clamping of the case parts together by the engagement of the projections with the flanges.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be more fully described below by means of an embodiment and with reference to the accompanying drawing in which
FIG. 1 is an elevational view, partly in section, of a hand set according to the invention upon fastening,
FIG. 2 shows the same set after the fastening,
FIG. 3 shows in a cross-section, taken on line III--III in FIG. 6, the microphone end of the hand set upon mounting,
FIG. 4 shows the same arrangement as FIG. 3 in a mounted state,
FIG. 5 shows the lower case half with a clamping strap in a planar view partly in section and
FIG. 6 shows the hand set as seen from the microphone end, partly in section.
PREFERRED EMBODIMENT
The upper case half of the handset is designated 1 in FIG. 1 and the lower case half is designated 2. At one of its short ends the lower half or part is provided with a groove 3 into which a hook 4 on the upper half or part can engage, so that a turning point is attained around which the upper part can revolve until the opposite end in close contact with the end of the lower part.
In previously known handsets, the fastening has been carried out by means of screws which when tightened cause the two case halves to be pressed towards each other while a clamping ring or a strap presses a transducer constituted by a microphone and/or a telephone receiver, respectively, against the bottom of the lower case half. However, when pressing the ends of the case halves together by means of the screws, a considerable bending strain arises due to the distance between the screws and the end of the casing which can result in cracks. This is prevented by a clamping strap 6 acc
REFERENCES:
patent: 4099034 (1978-07-01), Peterson
patent: 4163875 (1979-08-01), Cogan
Telephone Handset, H. D. Bales et al., Western Electric Technical Digest, No. 65, Jan. 1982, pp. 1-2.
Lindberg Jorgen F.
Stromer Carl-Axel
Tronslien Erling
Dwyer James L.
Pitts Harold I.
Telefonaktiebolaget LM Ericsson
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