Combination starter-protector device

• US 4,422,120 A
• Filed: 10/09/1981
• Issued: 12/20/1983
• Est. Priority Date: 10/13/1980
• Status: Expired due to Term

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: Kobayashi, Takashi, Yokota, Atsuo, Shikama, Takashi, Yamamoto, Tomoyuki
• Primary Examiner(s): Salce, Patrick R.
• Application Number:
  US06/310,122
• Time in Patent Office: 802 Days
• Field of Search: 361/24, 361/25, 361/26-29, 361/31, 361/32, 361/106, 361/165, 318/783, 318/784, 318/785, 318/788, 318/792
• US Class Current: 361/24
• CPC Class Codes: H01H 61/002 Structural combination of a time delay electrothermal relay with an electrothermal protective relay, e.g. a start relay

Abstract

A combination starter-protector device for a winding circuit of a dynamoelectric motor comprises a housing structure having a perforated wall dividing the interior of the housing structure into starter and protector compartments. The starter compartment accommodates therein a positive temperature coefficient thermistor while the protector compartment accommodates therein a bimetal switch. The housing structure has two sets of terminals, one set of the terminals being adapted to be connected to the winding circuit of the motor whereas the other set of the terminals are adapted to be connected to a power source. The distance between the thermistor and the bimetal switch may be adjustable by the employment of a spacer element.

Claims

1. A combination starter-protector device for a winding circuit of a single phase induction motor adapted to be energized from an electrical power source, which device comprises:

a housing structure having separate starter and protector compartments separated by a perforated wall interposed therebetween, the housing structure including at least a first outer surface area facing in a first direction and a second outer surface area facing in a second direction, different than said first direction;

a PTC thermistor housed within the starter compartment and having a pair of opposite electrodes;

a bimetal switch housed within the protector compartment and including a bimetallic element and a pair of spaced contacts rigidly carried by the housing structure in face-to-face relationship with and operatively engaging the bimetallic element, said bimetallic element being capable of assuming a circuit interrupting position, in which said bimetal switch is opened, and a circuit completing position in which said bimetal switch is closed;

a first terminal means carried by the housing structure and having a pair of opposite ends, one of the ends of said first terminal means being formed by a tab-on terminal and being exposed to the outside of the housing structure and the other of said opposite ends being connected to one of the spaced contacts;

a second terminal means carried by the housing structure and having a pair of opposite ends, one of the ends of said second terminal means being formed by a socket and being exposed to the outside of the housing structure and the other of said opposite ends being connected to the other of the spaced contacts;

a third terminal means carried by the housing structure and having a pair of opposite ends, one of said opposite ends of said third teminal means being formed by a tab-on terminal and being exposed to the outside of the housing structure and the other of said opposite ends being connected to one of the opposite electrodes of the thermistor;

a fourth terminal means carried by the housing structure and having a pair of opposite ends, one of said opposite ends of said fourth terminal means being formed by a socket and being exposed to the outside of the housing structure and the other of said opposite ends being connected to said one of the opposite electrodes of the thermistor;

a fifth terminal means carried by the housing structure and having a pair of opposite ends, one of said opposite ends of said fifth terminal means being formed by a tab-on terminal and being exposed to the outside of the housing structure and the other of said opposite ends being connected to the other of the opposite electrodes of the thermistor; and

a sixth terminal means having a pair of opposite ends exposed to the outside of the housing structure, one of said opposite ends of said sixth terminal means being formed by a tab-on terminal, another of said opposite ends of said sixth therminal means being formed by a socket, said sockets being oriented in a first direction extending through said first surface area of said housing structure, said tab-on terminals being oriented in a second direction extending through said second surface area of said housing structure.

2. A device as claimed in claim 1, wherein the housing structure is constituted by generally box-like first and second housings, the first housing having the starter compartment defined therein, said perforated wall occupying the bottom of the box-like first housing, said second housing having the protector compartment defined therein and mounted on the first housing with its opening facing the perforated wall in the first housing.

3. A device as claimed in claim 2, wherein the perforated wall has at least one perforation defined therein and communicating between the starter and protector compartments.

4. A device as claimed in claim 2, wherein the perforated wall has a plurality of perforations defined therein and communicating between the starter and protector compartments.

5. A device as claimed in claim 3, wherein said other of the opposite ends of said fifth terminal means is constituted by a disc body of a diameter larger than the diameter of said perforation in the perforated wall, said disc body having a plurality of apertures defined therein.

6. A device as claimed in claim 2, 3, 4 or 5, further comprising a spacer means interposed between the first and second housings.

7. A device as claimed in claim 1, further comprising a heating element connected in series between the other of the opposite ends of the second terminal means and the other of the spaced contacts.

8. A device as claimed in claim 6, further comprising a heating element connected in series between the other of the opposite ends of the first terminal means and the other of the spaced contacts.

9. A device as claimed in claim 1, wherein said first and second directions are substantially orthogonal.