Horology: time measuring systems or devices – Signalling means – Time condition responsive
Patent
1988-02-16
1990-05-01
Roskoski, Bernard
Horology: time measuring systems or devices
Signalling means
Time condition responsive
368262, G04C 2116, G04C 2316
Patent
active
049224751
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an alarm clock according to the generic clause of patent claim 1.
In CH patent specification No. 638,367 a wrist watch having settable, time-dependent signalling is described. This watch has an alarm-setting wheel which is adjustable from the outside by means of a button and mountingly disposed coaxial to the hour wheel on the hour-wheel pipe. The alarm-setting wheel is part of a circuit comprising an electronic control circuit and a battery electrically connected to the hour wheel. The circuit serves to control an alarm signal device and is closed by means of a contact spring resiliently secured to one side of the hour wheel, which contact spring meets a contact stud that passes through the electrically insulating minute-setting wheel and is electrically connected to a circular conductor path on the alarm-setting wheel. The contact spring glides over the insulating surface of the alarm-setting wheel until it touches the contact stud; in this connection there is an enormous risk of contamination of the contact surface, and contact-making is ill-defined in the beginning stage of the contact between the contact spring and the stud. Moreover, it is necessary that the contact spring be precisely adjusted at the time of assembly.
SUMMARY OF THE INVENTION
It is the task of the invention to provide an alarm clock of the type mentioned at the beginning in which contact-making for initiating the alarm signal takes place unequivocally and unproblematically, and in which the adjustment work on the contact elements is reduced to a minimum.
The alarm clock according to the nvention is characterized by the features recited in the characterizing part of patent claim 1.
Further embodiments are defined in the dependent claims.
The subject of the invention is explained in more detail below, by way of example, with reference to the drawing.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a section along the line I--I of FIG. 2 through the central region of an exemplified embodiment of the alarm clock according to the invention,
FIG. 2 shows the top plan view of the central region shown in FIG. 1, parts being omitted and other parts partially cut away,
FIG. 3 shows a section along the line III--III of FIG. 2,
FIG. 4 shows the same kind of representation as FIG. 3 but in another position of the depicted components, in which position an alarm signal is generated,
FIG. 5 shows a section along the line V--V of FIG. 3, one component being modified,
FIG. 6 shows the elevation of a second exemplified embodiment of the alarm clock according to the invention,
FIG. 7 shows a partial section along the line VII--VII of FIG. 6,
FIG. 8 shows a section through the central region of a third, preferred exemplified embodiment of the alarm clock according to the invention,
FIG. 9 shows the top plan view of part of the alarm clock according to FIG. 8,
FIG. 10 shows a contact element of the alarm clock according to FIG. 8 in perspective view, and
FIG. 11 shows the hour wheel of the alarm clock according to FIG. 8 in perspective view.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
In FIGS. 1 and 2, the central region of a first exemplified embodiment of the alarm clock according to the invention is drawn in section. A dial 1, shown only in part, has a central opening 2 through which a hollow hub 3 of a follower disc 4 extends. The follower disc 4 rests against the rear of the dial 1 and has lugs 5 extending away from the dial 1 at two opposite locations on its periphery. The follower disc 4 is rotatable relative to the dial 1, the inside wall of the said opening 2 and the circumferential surface of the hub 3 adjacent thereto being so designed that after the insertion of the hub 3 into the opening 2, there results a form-locking connection, and that a certain amount of friction must be overcome for relatively rotating the follower disc 4 with respect to the dial 1, whereby the follower disc 4 is prevented from rotating relative to the dial 1 through mere jarring. Mounted on the part of
REFERENCES:
patent: 4351043 (1982-09-01), Ogihara et al.
patent: 4396297 (1983-08-01), Akahane
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