# US 10,310,543 B2 · Actuator release mechanism

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- Number: US 10,310,543 B2
- Document ID: US10310543B2
- Status: Granted
- Kind: B2
- Application number: 15/473,901
- Filed: 2017-03-30
- Published: 2017-12-28
- Granted: 2019-06-04
- Earliest claimed: 2016-06-24
- Assignees: Hamilton Sundstrand Corporation
- Applicants: Hamilton Sundstrand Corporation
- Inventors: Przemysław Kiełczykowski; Jakub Bobak
- Web page: https://patentgrep.com/patent/US10310543B2

## CPC

- G05G 5/06: for holding members in one or a limited number of definite positions only ({G05G5/005}, G05G5/03, G05G5/05, G05G5/28 take precedence)
- B64D 41/007: {Ram air turbines}
- F05D 2220/34: in ram-air turbines ("RATS")
- G05G: CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY ("Bowden" or like mechanisms F16C1/10; gearings or mechanisms not peculiar to this purpose F16H; speed changing or reversing mechanisms for gearings conveying rotary motion F16H59/00 - F16H63/00)
- B64D: EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS

## Abstract

An actuator release mechanism includes an axially moveable member biased in a first axial position by a bias spring and driven to a second axial position by an actuation means such as a solenoid arranged in substantially the same axis as the axially moveable member. The axially moveable member can be a piston.

## Claims

### Claim 1

A ram air turbine (RAT) actuator release mechanism comprising:
a longitudinal member moveable along an axis between a lock position and a release position;
bias means to bias the longitudinal member in one of the lock position and the release position; and
actuation means arranged to cause the longitudinal member to move along the axis away from the one position and towards the other of the lock position and the release position;
wherein the bias means is a toggle spring that, when the actuation means are not activated, is in a relaxed state that biases the longitudinal member towards a lock bolt to prevent movement of the actuation means.

### Claim 2 (depends on 1)

An actuator release mechanism as claimed claim 1, wherein the longitudinal member comprises a piston.

### Claim 3 (depends on 1)

An actuator release mechanism as claimed in claim 1, wherein the actuation means comprises a solenoid.

### Claim 4 (depends on 3)

An actuator release mechanism as claimed claim 3, wherein the longitudinal member comprises a piston.

### Claim 5 (depends on 3)

An actuator release mechanism as claimed in claim 3, wherein the solenoid is a pull-type solenoid.

### Claim 6 (depends on 5)

An actuator release mechanism as claimed claim 5, wherein the longitudinal member comprises a piston.

### Claim 7

A ram air turbine (RAT) actuator assembly comprising:
a lock bolt; and
an actuator release mechanism moveable relative to the lock bolt to permit or prevent axial movement of the lock bolt, the actuator release mechanism comprising:
a longitudinal member moveable along an axis between a lock position and a release position;
bias means to bias the longitudinal member in one of the lock position and the release position; and
actuation means arranged to cause the longitudinal member to move along the axis away from the one position and towards the other of the lock position and the release position;
wherein the bias means is a toggle spring that, when the actuation means are not activated, is in a relaxed state that biases the longitudinal member towards the lock bolt to prevent movement of the actuation means.

### Claim 8 (depends on 7)

The assembly of claim 7, wherein the actuation means comprises a solenoid.

### Claim 9 (depends on 8)

An assembly as claimed in claim 8, wherein the solenoid is a pull-type solenoid.

### Claim 10 (depends on 7)

An assembly as claimed in claim 7, wherein the actuation means comprises a spring.