Adapter for mounting a portable telephone on a vehicle

• US 4,974,250 A
• Filed: 11/17/1989
• Issued: 11/27/1990
• Est. Priority Date: 11/22/1988
• Status: Expired due to Fees

• Current Assignee: NEC Corporation, Treadmill With Pivoting Handles, Inc.
• Original Assignee: NEC Corporation
• Inventors: Tomiyori, Yutaka
• Primary Examiner(s): Ng, Jin F.
• Assistant Examiner(s): BOST, DWAYNE D
• Application Number:
  US07/438,620
• Time in Patent Office: 375 Days
• Field of Search: 379/58, 379/441, 379/446, 379/454, 379/455, 381/86
• US Class Current: 455/557
• CPC Class Codes: H04B 1/3877 Arrangements for enabling portable transceivers to be used in a fixed position, e.g. cradles or boosters
• CPC Class Codes: H04W 52/0296 switching to a backup power supply
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

An adapter for mounting a portable telephone on a vehicle allows either one of a simple handset and a multi-function handset to be used therewith as desired. The adapter does not need a power switch and associated circuitry and, therefore, reduces the overall weight and size of a portable telephone system. When a multi-function handset is used with the adapter, the adapter is switched on and off by a power switch which is provided on the handset. When a simple handset is used with the adapter, the adapter is switched on and off by an ignition switch which is provided on the vehicle. Further, the adapter promotes easy and convenient use of a handset because it automatically adapts itself to both of a multi-function handset and a simple handset.

Claims

1. An adaptor for selectively mounting on a vehicle a simple handset having an open handset detecting terminal and a multi-function handset having a handset detecting terminal connecting to ground and a power switch terminal connecting to a power switch, said handset forming a part of a portable telephone system, said adapter comprising:

a handset detecting line connected to the handset detecting terminal;

a power switch connecting line connected to the power switch terminal;

power feeding line for feeding power to the portable telephone system;

switching means for switching supply of power to said power feeding line on and off;

flip-flop means being set when said hand-set detecting line is opened and inverted by an input to said power switch connecting line when said handset detecting line is connected to ground; and

AND means for feeding a control signal to said switching means by ANDing an ignition ON state of the vehicle and an output of said flip-flop means.

2. An adapter as claimed in claim 1, wherein said switching means comprises a relay switch.

3. An adapter as claimed in claim 1, wherein said flip-flop means comprises a T flip-flop.

4. An adapter as claimed in claim 1, wherein said AND means comprises a 2-input AND gate.