Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
194 words
An interval timer comprising: frame means including a dial plate carrying time interval markings, an interval shaft rotatably mounted on said frame means, an interval hand on said interval shaft rotatable therewith relative to said time interval markings on said dial plate and manually settable with said shaft to a predetermined interval, an alternating current timing motor mounted on said frame means and having a magnetic field structure, a buzzer arm mounted on said frame means and arranged to be vibrated by the magnetic field of said magnetic field structure, a cam follower connected to said buzzer arm, a cam on said interval shaft engaged by said cam follower for holding said buzzer arm in nonoperating position with respect to said magnetic field until the end of the inteRval for which the timer is set, and a gear train interconnecting said motor and said interval shaft including: relatively low speed high torque clutch means connected to said interval shaft for rotating it during a low speed portion of a revolution, and relatively high speed low torque clutch means connected to said interval shaft for rotating it during a high speed portion of said revolution.
Claim 2
Dependent Claim
194 words
An interval timer comprising: frame means including a dial plate carrying time interval markings, an interval shaft rotatably mounted on said frame means, an interval hand on said interval shaft rotatable therewith relative to said time interval markings on said dial plate and manually settable with said shaft to a predetermined interval, an alternating current timing motor mounted on said frame means and having a magnetic field structure, a buzzer arm mounted on said frame means and arranged to be vibrated by the magnetic field of said magnetic field structure, a cam follower connected to said buzzer arm, a cam on said interval shaft engaged by said cam follower for holding said buzzer arm in nonoperating position with respect to said magnetic field until the end of the inteRval for which the timer is set, and a gear train interconnecting said motor and said interval shaft including: relatively low speed high torque clutch means connected to said interval shaft for rotating it during a low speed portion of a revolution, and relatively high speed low torque clutch means connected to said interval shaft for rotating it during a high speed portion of said revolution.
Claim 3
Dependent Claim
26 words
The interval timer according to claim 1 wherein said gear train includes clutch means whereby said interval shaft can be rotated manually independently of said motor.
Claim 4
Dependent Claim
62 words
The interval timer according to claim 1 wherein said time interval markings include a long time set with respect to which said interval hand is rotated relatively slowly through said relatively low speed high torque clutch means and a short time set with respect to which said interval hand is rotated relatively quickly through said relatively high speed low torque clutch means.
Claim 5
Dependent Claim
78 words
The timer according to claim 1 wherein: said cam has gear teeth along only a portion of its periphery, said relatively low speed high torque clutch means includes a gear for driving engagement with said gear teeth on said cam during said low speed portion of a revolution, and said relatively high speed low torque clutch means includes a gear for driving engagement with said gear teeth on said cam during said high speed portion of a revolution.
Claim 6
Dependent Claim
32 words
The timer according to claim 4 wherein said gears of said clutches simultaneously engage said gear teeth on said cam during the final part of said low speed portion of a revolution.
Claim 7
Dependent Claim
33 words
The timer according to claim 5 wherein said gear teeth on said cam initially engaged by said gear of said high speed low torque clutch are of increasing length as the engagement progresses.
Claim 8
Dependent Claim
36 words
The interval timer according to claim 5 wherein said cam has gear teeth along only a portion of its periphery whereby it is driven through said clutch means by said motor through less than one revolution.