# US 8,783,426 B2 · Movable barrier hydraulic braking

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- Number: US 8,783,426 B2
- Document ID: US8783426B2
- Status: Granted
- Kind: B2
- Application number: 13/330,009
- Filed: 2011-12-19
- Published: 2013-06-20
- Granted: 2014-07-22
- Earliest claimed: 2011-12-19
- Assignees: The Chamberlain Group, Inc.
- Applicants: Roger William Lhotak; Brian Roy Skotty
- Inventors: Roger William Lhotak; Brian Roy Skotty
- Web page: https://patentgrep.com/patent/US8783426B2

## CPC

- F16D 65/14: Actuating mechanisms for brakes; Means for initiating operation at a predetermined position (brake control systems, parts thereof B60T)
- E05F 15/50: using fluid-pressure actuators
- E06B 9/70: comprising an electric motor positioned outside the roller
- E06B 9/80: Safety measures against dropping or unauthorised opening; Braking or immobilising devices; Devices for limiting unrolling (securing devices or arrangements for direct manual operation E06B9/78)
- F16D 55/28: Brakes with only one rotating disc
- E05Y 2900/00: Application of doors, windows, wings or fittings thereof
- E05Y 2900/106: for garages
- E06B 2009/808: {Fluid brakes}
- F16D 2121/04: acting on a piston-type actuator, e.g. for liquid pressure
- F16D 2125/023: {Pumps}
- Y10T 29/49229: Prime mover or fluid pump making
- Y10T 29/49236: Fluid pump or compressor making
- F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- 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
- E06B: FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES (shades or blinds for greenhouses A01G9/22; curtains A47H; lids for car boots or bonnets B62D25/10; skylights E04B7/18; sunshades, awnings E04F10/00)
- 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
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A hydraulic brake apparatus, a movable barrier apparatus, a hydraulic brake kit, a method of stopping movement of a movable barrier, and a method installing a hydraulic brake assembly are described herein. A selectively operable piston mechanism converts rotation of a drive shaft of a movable barrier into hydraulic pressure used to operate a brake configured to stop movement of the drive shaft.

## Claims

### Claim 1

A method of impeding rotation of a drive shaft to stop movement of a movable barrier, the method comprising:
converting rotational movement of a drive shaft into linear movement of a piston within a piston pump;
creating pressure within a hydraulic line fluidly connected to the piston pump by operation of the piston pump;
the pressure driving a brake pad into frictional engagement with a brake member coupled to the drive shaft.

### Claim 2 (depends on 1)

The method of claim 1 wherein the converting the rotational movement of the drive shaft into linear movement of the piston within the piston pump comprises engaging with the piston a cam coupled to the drive shaft to be rotated by the drive shaft.

### Claim 3 (depends on 2)

The method of claim 2 wherein engaging the cam comprises shifting a spool configured to control fluid connections to and from the piston pump to an operational position to pressurize the piston pump and drive the piston pump into engagement with the cam.

### Claim 4 (depends on 3)

The method of claim 3 further comprising shifting the spool to an off position causing the piston pump to remain in a compressed position out of engagement with the cam.

### Claim 5 (depends on 3)

The method of claim 3 further comprising:
sensing falling of a movable barrier with a control device; and
wherein the shifting of the spool to the operational position is performed in response to the sensing.

### Claim 6 (depends on 2)

The method of claim 2 further comprising pressurizing a fluid reservoir; and
wherein engaging with the piston the cam comprises releasing pressure within the fluid reservoir to drive the piston to an operational extended state that is within a path of travel of the cam.

### Claim 7 (depends on 2)

The method of claim 2 wherein engaging with the piston the cam comprises driving the piston to an operational extended state with a return spring.

### Claim 8 (depends on 1)

The method of claim 1 wherein the driving the brake pad into frictional engagement with the brake member further comprises a brake piston shifting the brake pad into frictional engagement with the brake member in response to pressure in the hydraulic line.