# US 4,394,708 A · Electronic thermostat with protected circuitry

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- Number: US 4,394,708 A
- Document ID: US4394708A
- Status: Granted
- Kind: A
- Application number: 06/261,067
- Filed: 1981-05-06
- Granted: 1983-07-19
- Earliest claimed: 1981-05-06
- Assignees: Honeywell Inc.
- Inventors: Donald J. Kasprzyk
- Web page: https://patentgrep.com/patent/US4394708A

## CPC

- H05K 5/0018: {having an electronic display}
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS

## Abstract

An electronic thermostat is provided with a mounting arrangement between the base means and the cover means that fully protects the electronic components within from both physical and electrical damage during the normal handling of the thermostat. The protection is accomplished by recessing the contact points for the circuitry within openings that can be reached only by mating electrical contacts.

## Claims

### Claim 1

An electronic thermostat having circuit components that are subject to electrical and mechanical damage, including: mounting base means and cover means forming said electronic thermostat when said base means and said cover means are mounted together; circuit board means including electronic circuit components that are susceptible of electrical and mechanical damage; said circuit board means further having contact means in the form of a plurality of separate individual contact members mounted upon said board means and connected to said electronic circuit components; said circuit board means mounted within said cover means; insulating enclosure means mounted within said cover means to partially enclose said circuit board means to protect said circuit board means from damage by accidental contact with said circuit board means; said insulating enclosure means including barrier means which form separate individual plural contact openings of limited size to provide access to said individual contact members through said contact openings; said base means adapted to be mounted upon a surface with said base means including connection means; and said base connection means including separate plural electric base contact members that project from said base means through said openings to engage said circuit board contact members to complete electric connections from said base means to said circuit board means to complete the mounting of said electronic thermostat.

### Claim 2 (depends on 1)

An electronic thermostat as described in claim 1 wherein said circuit board contact means includes flexible contact members which frictionally engage said electric contact members projecting from said base means.

### Claim 3 (depends on 2)

An electronic thermostat as described in claim 2 wherein each of said electric contact members includes a base portion rigidly attached to said base means and an upstanding portion projecting from said base means and engaging one of said contact members at said circuit board means.

### Claim 4 (depends on 1)

An electronic thermostat as described in claim 1 wherein said electronic thermostat further includes hinge means for joining said mounting base means and said cover means; said hinge means aiding the alignment of said electric contact members and said contact means to allow said contact members and said contact means to be compressed to complete an electric connection from said base means to said circuit board means; and detent means opposite from said hinge means to retain said mounting base means and said cover means mounted together.

### Claim 5 (depends on 4)

An electronic thermostat as described in claim 4 wherein said hinge means is formed as a pair of interlocking members integral with said mounting base means and said cover means.

### Claim 6 (depends on 5)

An electronic thermostat as described in claim 5 wherein said hinge means is formed adjacent said contact means which are mounted upon said circuit board means and said electric contact members.

### Claim 7 (depends on 6)

An electronic thermostat as described in claim 6 wherein said circuit board contact means includes flexible contact members which frictionally engage said electric contact members projecting from said base means.

### Claim 8 (depends on 7)

An electronic thermostat as described in claim 7 wherein each of said electric contact members includes a base portion rigidly attached to said base means and an upstanding portion projecting from said base means and frictionally engaging one of said flexible contact members at said circuit board means.