# US 10,370,885 B1 · Hydraulic door closer with fluid overflow chamber

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 10,370,885 B1
- Document ID: US10370885B1
- Status: Granted
- Kind: B1
- Application number: 15/392,070
- Filed: 2016-12-28
- Granted: 2019-08-06
- Earliest claimed: 2015-12-31
- Assignees: Larson Manufacturing Company of South Dakota, Inc.
- Applicants: Larson Manufacturing Company of South Dakota
- Inventors: Michael W. Kondratuk
- Web page: https://patentgrep.com/patent/US10370885B1

## CPC

- E05F 3/102: {with rack-and-pinion transmission between driving shaft and piston within the closer housing}
- E05F 3/12: Special devices controlling the circulation of the liquid, e.g. valve arrangement ({E05F3/223 takes precedence}; valves per se F16K)
- E05F 3/14: with fluid brakes of the rotary type
- E05F 3/10: with a spring, other than a torsion spring, and a piston, the axes of which are the same or lie in the same direction
- E05Y 2201/264: linear
- E05Y 2201/474: Compression springs
- E05Y 2900/132: Doors
- E05F: DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
- E05Y: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF

## Abstract

This disclosure is generally directed to a hydraulic door closer, and more specifically is directed to a hydraulic storm or screen door closer that has a fluid overflow chamber providing fluid volume and pressure control for both expanded and contracted fluid at different temperatures. The disclosed hydraulic door closer comprises a fluid overflow chamber adapted to hold sufficient fluid to maintain required operating fluid or oil levels at different temperatures, and to ensure proper closer performance under both extreme high and low temperature conditions.

## Claims

### Claim 1

A hydraulic door closer comprising a housing filled with fluid fitted with i) a biasing spring attached to a piston having geared teeth and a check valve, ii) a geared pinion, iii) a speed control chamber, and iv) a fluid overflow chamber adapted to hold sufficient fluid when the fluid is in both an expanded and contracted state, the fluid overflow chamber comprising an overflow chamber piston, an overflow chamber piston seal, and an overflow chamber spring.

### Claim 2 (depends on 1)

The hydraulic door closer of claim 1, further comprising a speed control valve.

### Claim 3 (depends on 1)

The hydraulic door closer of claim 1, further comprising horizontal and vertical speed control chamber plugs.

### Claim 4 (depends on 1)

The hydraulic door closer of claim 1, further comprising an overflow chamber check valve.

### Claim 5 (depends on 1)

The hydraulic door closer of claim 1, wherein the biasing spring is a compression spring.

### Claim 6 (depends on 1)

The hydraulic door closer of claim 1, wherein the fluid overflow chamber is a vertical chamber, a horizontal chamber, or an angled chamber.

### Claim 7 (depends on 1)

The hydraulic door closer of claim 1, wherein the fluid overflow chamber is in an interior region of the closer.

### Claim 8

A hydraulic door closer comprising a housing filled with fluid fitted with i) a biasing spring attached to a piston having geared teeth and a check valve, ii) a geared pinion, iii) a speed control chamber, iv) a fluid overflow chamber having a predetermined volume sufficient to hold an expanded fluid at an elevated temperature, the fluid overflow chamber comprising an overflow chamber piston, an overflow chamber piston seal, and an overflow chamber spring.

### Claim 9 (depends on 8)

The hydraulic door closer of claim 8, wherein the fluid overflow chamber is in an interior region of the closer.

### Claim 10 (depends on 8)

The hydraulic door closer of claim 8, wherein the fluid overflow chamber is a vertical chamber, a horizontal chamber, or an angled chamber.

### Claim 11

A hydraulic door closer comprising a housing filled with fluid fitted with i) a biasing spring attached to a piston having geared teeth and a check valve, ii) a geared pinion, iii) a speed control chamber, and iv) a fluid overflow chamber, wherein the fluid overflow chamber comprises an overflow chamber piston, an overflow chamber piston seal, and an overflow chamber spring, and wherein the fluid overflow chamber maintains an amount of the fluid so that when the fluid contracts there is sufficient fluid in the closer.

### Claim 12 (depends on 11)

The hydraulic door closer of claim 11, wherein the fluid overflow chamber is a vertical chamber, a horizontal chamber, or an angled chamber.

### Claim 13 (depends on 11)

The hydraulic door closer of claim 11, wherein the fluid overflow chamber is in an interior region of the closer.