# US 11,992,832 B2 · Safety cabinet

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- Number: US 11,992,832 B2
- Document ID: US11992832B2
- Status: Granted
- Kind: B2
- Application number: 17/345,750
- Filed: 2021-06-11
- Published: 2022-03-31
- Granted: 2024-05-28
- Earliest claimed: 2020-09-28
- Assignees: Hitachi Industrial Equipment Systems Co., Ltd.
- Applicants: Hitachi Industrial Equipment Systems Co., Ltd.
- Inventors: Takeshi Kaneko; Takeshi Matsumura
- Web page: https://patentgrep.com/patent/US11992832B2

## CPC

- B01L 1/04: Dust-free rooms or enclosures
- F24F 3/163: Clean air work stations, i.e. selected areas within a space which filtered air is passed
- F24F 8/108: using dry filter elements
- B01L 2200/0631: Purification arrangements, e.g. solid phase extraction [SPE]
- B01L 2200/0684: Venting, avoiding backpressure, avoid gas bubbles
- B01L 2300/04: Closures and closing means
- B01L 2300/0681: Filter
- B01L: CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- F24F: AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING (removing dirt or fumes from areas where they are produced B08B15/00; vertical ducts for carrying away waste gases from buildings E04F17/02; tops for chimneys or ventilating shafts, terminals for flues F23L17/02)

## Abstract

A safety cabinet that includes an opening portion in a front surface of a work space and a front shutter, and supplies purified air into the work space from above. The front shutter slides in an upward and downward direction to close a part or an entirety of the opening portion. The front shutter includes a small window shutter that slides in a lateral direction.

## Claims

### Claim 1

A safety cabinet that includes an opening portion in a front surface of a work space and a front shutter that slides in an upward and downward direction to close a part or an entirety of the opening portion, and supplies purified air through a HEPA filter into the work space from above and sucks air from front and rear slits below the work space,
wherein
the front shutter includes a small window shutter that opens by sliding in a lateral direction in a substantially central portion in the upward and downward direction, and
a worker can work by inserting arms into the work space from below the front shutter to perform work in a sitting posture, and the worker can work by directly inserting arms into the work space through an opening by sliding the small window shutter to perform work in a standing posture.

### Claim 2 (depends on 1)

The safety cabinet according to claim 1,
wherein when the small window shutter slides in the lateral direction to be opened, a worker can insert both arms to perform work.

### Claim 3 (depends on 1)

The safety cabinet according to claim 1,
wherein the safety cabinet has such a width that two or more workers can perform work, and
a plurality of the small window shutters are provided in the lateral direction.

### Claim 4 (depends on 1)

The safety cabinet according to claim 1,
wherein the front shutter includes fixed windows above and below the small window shutter.

### Claim 5 (depends on 1)

The safety cabinet according to claim 1,
wherein when the front shutter is opened, a worker can insert arms from below the front shutter to perform work in a sitting posture, and a worker can insert arms from the small window shutter to perform work in a standing posture.

### Claim 6 (depends on 1)

The safety cabinet according to claim 1,
wherein the front shutter is closed, a worker can insert arms from the small window shutter to perform work in a standing posture.

### Claim 7 (depends on 1)

The safety cabinet according to claim 1,
wherein when the front shutter is closed, dual air barriers are provided in a flow path in which an air barrier is formed by normal air that has flowed in from outside through the gap between a casing and an upper portion of the front shutter, and a flow path in which an air barrier is formed by the purified air.

### Claim 8 (depends on 7)

The safety cabinet according to claim 7,
wherein a gap closing member is provided which forms a gap between a fixed window of the front shutter and the gap closing member when the front shutter is closed, and closes the gap with a shutter frame of the front shutter when the front shutter is opened.

### Claim 9 (depends on 7)

The safety cabinet according to claim 7,
wherein a slit that suctions the normal air which has flowed in and the purified air is provided in a lower front portion of the work space.

### Claim 10 (depends on 7)

The safety cabinet according to claim 7,
A rectification plate extending downward is provided in a housing at a position of a front upper portion of the work space.