1. A switch adapted to be positioned on a pushrod of a hydraulic cylinder assembly and including a housing adapted to be positioned proximate an end of the hydraulic cylinder assembly and a plunger mounted for axial sliding movement in the housing, the housing and plunger being adapted to be fitted over the pushrod with a driving connection between the pushrod and the plunger whereby the plunger is moved slidably forwardly in the housing in response to forward movement of the pushrod for selective coaction between contact structure carried by the plunger and contact structure carried by the housing to generate a control signal, characterized in that:
the driving connection between the pushrod and the plunger includes anti-rotation structure on the plunger precluding rotation of the plunger relative to the pushrod.
2. A switch according to claim 1 wherein the plunger anti-rotation structure includes an anti-rotation pocket defined in the plunger and adapted to receive an anti-rotation structure on the pushrod.
3. A switch according to claim 2 wherein the pocket comprises a notch opening in a rear face of the plunger and adapted to receive a lug formed on the pushrod and sized to fit in the notch.
4. A switch according to claim 3 wherein:
the plunger and the housing define downwardly opening channels to facilitate fitting of the housing and plunger over the pushrod; and
the notch is defined in surrounding relation to the channel in the plunger.
5. A hydraulic master cylinder assembly including a master cylinder, a piston mounted in the master cylinder, a pushrod projecting at its forward end into the rear end of the master cylinder for connection to the piston, and a switch assembly positioned on the pushrod and including a hollow switch housing defining switch means and a plunger assembly mounted on and driven by the pushrod for sliding movement in the housing in response to forward movement of the pushrod to coact with the switch means to generate a control signal, characterized in that:
the driving connection between the pushrod and the plunger includes anti-rotation structure precluding rotation of the plunger relative to the pushrod.
6. A master cylinder assembly according to claim 5 wherein the anti-rotation structure includes an anti-rotation pocket defined in the plunger and an anti-rotation structure on the pushrod received in the pocket.
7. A hydraulic master cylinder assembly according to claim 6 wherein the pocket comprises a notch opening in a rear face of the plunger and the anti-rotation structure on the plunger comprises a lug sized to fit in the notch.
8. A hydraulic master cylinder assembly according to claim 7 wherein:
the driving connection comprises a shoulder on the pushrod pushingly engaging the plunger; and
the lug is formed at the shoulder.
9. A hydraulic master assembly according to claim 8 wherein:
the pushrod has a circular cross-sectional configuration and defines a central axis; and
the lug is constituted as an eccentricity formed on the pushrod proximate the shoulder.
10. A hydraulic master cylinder assembly according to claim 7 wherein:
the plunger and the housing define downwardly opening grooves to accommodate positioning of the switch assembly on the pushrod; and
the notch is formed in the rear face of the plunger in surrounding relation to the downwardly opening groove in the plunger.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A system (10) for synchronizing records of duty status, RODS, information of a vehicle with a stationary unit, comprising:
at least one mobile unit (100) configured to generate RODS, store the generated RODS, and transmit RODS; and
a stationary unit (300) configured to receive and store RODS transmitted by the at least one mobile unit,
wherein the at least one mobile unit (100) is further configured to transmit a newly generated first RODS to the stationary unit in an initial synchronization step of a synchronization process of synchronizing the RODS stored on the at least one mobile unit and the RODS stored on the stationary unit,
wherein the at least one mobile unit (100) is further configured to generate a checksum of the first RODS after transmission of the first RODS to the stationary unit and to transmit only the checksum of the first RODS to the stationary unit in a subsequent synchronization step of the synchronization process,
wherein the stationary unit (300) is configured to generate a checksum of the RODS received from the at least one mobile unit (100), wherein in the event of any discrepancy between the checksum generated by the at least one mobile unit (100) and the checksum generated by the stationary unit (300), the RODS from the stationary unit overrules the RODS from the mobile unit (100), and
wherein the checksum is generated according to a first checksum generation algorithm.
2. The system (10) according to claim 1,
wherein the at least one mobile unit is configured to store RODS of a multitude of operators and to identify an operator according to an operator identity.
3. The system (10) according to claim 1,
wherein the at least one mobile unit is configured to start the synchronization process after a login-event of an operator.
4. The system (10) according to claim 3,
wherein the at least one mobile unit and the stationary unit are configured to synchronize only the RODS of an operator logged on to the at least one mobile unit during the synchronization process.
5. The system (10) according to claim 1,
wherein the stationary unit (300) is configured to modify a RODS stored on the stationary unit.
6. The system (10) according to claim 1,
wherein the stationary unit (300) is configured to generate a checksum of the RODS stored on the stationary unit according to the first checksum generation algorithm.
7. The system (10) according to claim 6,
wherein the stationary unit (300) is configured to compare the generated checksum of the first RODS and the checksum of the first RODS transmitted by the at least one mobile unit and, if these checksums are not identical, transmit the first RODS from the stationary unit to the at least one mobile unit.
8. The system (10) according to claim 7,
wherein the at least one mobile unit is configured to overwrite the first RODS in case the stationary unit transmits a modified first RODS.
9. The system (10) according to claim 1,
wherein the at least one mobile unit (100) has a transmission element (130) configured to wirelessly transmit RODS to the stationary unit (300).
10. The system (10) according to claim 1,
wherein the at least one mobile unit (100) is mounted to a vehicle (200).
11. The system (10) according to claim 1,
wherein the stationary unit (300) is configured to receive RODS from a multitude of mobile units (100).