# US 2025/0093379 A1 · Roller based accelerometer

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- Number: US 2025/0093379 A1
- Document ID: US20250093379A1
- Status: Published application
- Kind: A1
- Application number: 18/577,009
- Filed: 2022-05-07
- Published: 2025-03-20
- Earliest claimed: 2021-07-05
- Inventors: Tilak SRINIVASAN
- Web page: https://patentgrep.com/patent/US20250093379A1

## CPC

- G01P 15/003: {Kinematic accelerometers, i.e. measuring acceleration in relation to an external reference frame, e.g. Ferratis accelerometers (G01P15/001, G01P15/16, G01P15/165 take precedence)}
- G01P 15/093: by photoelectric pick-up
- G01F 15/003: {using electromagnetic, electric or electronic means (G01F15/002, G01F15/02 take precedence)}
- G01P: MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT (measuring or recording blood flow A61B5/02, A61B8/06; monitoring speed or deceleration of electrically-propelled vehicles B60L3/00; vehicle lighting systems adapted to indicate speed B60Q1/54; determining position or course in navigation, measuring ground distance in geodesy or surveying G01C; combined measuring devices for measuring two or more variables of movement G01C23/00; measuring velocity of sound G01H; measuring velocity of light G01J7/00; measuring direction or velocity of solid objects by reception or emission of radiowaves or other waves and based on propagation effects, e.g. Doppler effect, propagation time, direction of propagation, G01S; measuring speed of nuclear radiation G01T; measuring acceleration of gravity G01V; {measuring or recording the speed of trains B61L23/00; speed indicators incorporated in motor vehicles B60K35/00; measuring frequency or phase G01R; traffic control G08G})
- G01F: MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME

## Abstract

A roller-based accelerometer (100) is disclosed and includes an enclosure (1). A hub (2) is defined at a center of the enclosure (1), concentric to an inner surface (1a) of the enclosure (1). A bearing (3) is rotatably housed in the hub (2). An arm (4) is fixedly connected to the bearing (3). The arm (4) is configured displace within the enclosure (1). A plurality of sensors (6) is mounted on the enclosure (1). A roller (5) is positioned at a free end of the arm (4), contacting the inner surface (1a) of the enclosure (1). The roller (5) traverses the inner surface of the enclosure and over the plurality of sensors (6). The arm (4) angularly oscillates when the accelerometer (100) is accelerated and is dependent on the position of the roller (5) over one of the plurality of sensors (6) to indicate the acceleration of the accelerometer (100).

## Claims

### Claim 1

A roller-based accelerometer (100) comprising:
an enclosure (1);
a hub (2) defined at a centre of the enclosure (1) and concentric to an inner surface (1a) of the enclosure (1);
a bearing (3) rotatably housed in the hub (2);
an arm (4) fixedly connected to the bearing (3) wherein the arm (4) is configured to displace within the enclosure (1);
a plurality of sensors (6) mounted on the enclosure (1);
a roller (5) positioned at a free end of the arm (4), contacting the inner surface (1a) of the enclosure (1) wherein, the roller (5) traverses the inner surface of the enclosure and over the plurality of sensors (6); and
wherein, the roller (5) and the arm (4) angularly oscillates when the accelerometer (100) is accelerated and, the position of the roller (5) over one of the plurality of sensors (6) is indicative of the acceleration of the accelerometer (100).

### Claim 2 (depends on 1)

The accelerometer (100) as claimed in claim 1 wherein, the plurality of sensors (6) is positioned to encompass half of a bottom region of the total circumference of the enclosure (1) and the sensors (6) are aligned for a total of 180 degrees along the outer surface (1b) of the enclosure (1).

### Claim 3 (depends on 1)

The accelerometer (100) as claimed in claim 1 wherein, the plurality of sensors (6) are aligned to extend for +90 degrees and −90 degrees from a bottom tip of the outer surface (1b) in the enclosure (1).

### Claim 4 (depends on 1)

The accelerometer (100) as claimed in claim 1 comprising, a control unit connected to the plurality of sensors (6).

### Claim 5 (depends on 1)

The accelerometer (100) as claimed in claim 1 comprises, at least one light source positioned proximal to the enclosure (1) for illuminating the sensors (6).

### Claim 6 (depends on 1)

The accelerometer (100) as claimed in claim 1 wherein, the plurality of sensors (6) are optical sensors (6) that generate and transmit a signal to the control unit when no light is incident on the plurality of sensors (6).

### Claim 7 (depends on 1)

The accelerometer (100) as claimed in claim 1 wherein, the roller (5) is opaque and prevents light from being incident on the plurality of sensors (6).

### Claim 8 (depends on 1)

The accelerometer (100) as claimed in claim 1 wherein, the enclosure (1), the hub (2), the bearing (3), and the arm (4) are made of a transparent material for allowing the light to incident on the plurality of sensors (6).