Brake release device attached to a door machine

• US 8,807,294 B2
• Filed: 01/06/2012
• Issued: 08/19/2014
• Est. Priority Date: 08/26/2011
• Status: Active Grant

• Current Assignee: Chung-Hsien Hsieh
• Original Assignee: Chung-Hsien Hsieh
• Inventors: Hsieh, Chung-Hsien
• Primary Examiner(s): Siconolfi, Robert A
• Assistant Examiner(s): POON, CHARLES YULUNG
• Application Number:
  US13/344,894
• Publication Number:
  US 20130048440A1
• Time in Patent Office: 956 Days
• Field of Search: 188/69, 188/31, 188/156, 188/265, 188/161, 188/171, 188/158, 49/1, 49/5, 49/7, 49/8, 160/1, 160/7, 160/8, 160/9, 704/22, 704/39, 704/40, 109/32, 109/33, 109/34, 109/36
• US Class Current: 188/69
• CPC Class Codes: F16D 2055/0058 Fully lined, i.e. braking surface extending over the entire disc circumference
• CPC Class Codes: F16D 2121/22 for releasing a normally applied brake
• CPC Class Codes: F16D 2127/04 for manual operation
• CPC Class Codes: F16D 55/28 Brakes with only one rotating disc
• CPC Class Codes: F16D 59/02 spring-loaded and adapted to be released by mechanical, fluid, or electromagnetic means
• CPC Class Codes: F16D 63/00 Brakes not otherwise provided for; Brakes combining more than one of the types of groups F16D49/00 - F16D61/00
• CPC Class Codes: F16D 65/28 arranged apart from the brake

Abstract

A brake release device attached to a door machine comprises a ring plate provided with a plurality of openings and fixed on a pull chain disc, a base plate located at the outside of the door machine, a passive plate provided with a plurality of plug pins that correspond to the openings of the ring plate and slides together with the sliding pin, a guiding member fixed together with the base plate, a sliding pin corresponding to a brake release bar for releasing brake of the door machine and slidably guided by the guiding member, a spring element and a fusible link device that curbs the sliding pin from leaving the brake release bar. By the spring element, the guiding member stores potential energy for sliding.

Claims

1. A brake release device (40) attached to a door machine, said door machine (1) comprises an axle (2), a brake device (10) for braking said axle (2), a brake release bar (20) provided at the outside of said door machine (1) for actuating said brake device (10) to release said axle (2), and a pull chain disc (31) for rotating said axle (2), wherein said brake release device (40) comprises:

a ring plate (41) fixed on a lateral end face of said pull chain disc (31), a plurality of equally spaced openings (411) being formed along the entire circumference of said ring plate;

a base plate (43) provided at the outside of said door machine (1), and having a horizontal guiding portion (431) at one end thereof;

a passive plate (44) having a plurality of plug pins (441) corresponding to said openings (411) of said ring plate (41) being provided on one end face thereof, said passive plate being guided by said guiding portion (431) to move between a first position in which said plug pins (441) are separated from said openings (411), and a second position in which said plug pins (441) are inserted into corresponding openings (411);

a guiding member (45) parallel to said axle (2) being disposed on said base plate (43), said guiding member (45) having an axial guiding hole (451);

a sliding pin (46) mounted within said guiding hole (451) for sliding therein, one end of said sliding pin (46) corresponding to said brake release bar (20) and the other end of said sliding pin (46) being connected to said passive plate (44);

a spring element (47) accommodated in said guiding hole (451), one end of said spring element (47) abutting against said guiding member (45) and the other end of said spring element (47) abutting against said sliding pin (46) to an effect that said sliding pin (46) is compressed by said spring element and tends to move toward said brake release bar (20); and

a fusible link device (48) having one end provided at a predetermined position, and the other end connected with said sliding pin (46) through a connecting member (481) so as to resist the restoring force of said spring element (47), so that the sliding pin is maintained at a distance from said brake release bar (20), and said passive plate (44) is maintained at said first position;

when the surrounding temperature exceeds the melting point of said fusible link device (48), said fusible link device (48) melts and said connecting member (481) connecting said sliding pin is released, and said sliding pin (46) slides toward said brake release bar (20) under the action of the restoring force of said spring element to impact against said brake release bar (20) so as to release said brake device (10), whereby said passive plate (44) is actuated to move to said second position.

2. The brake release device as claimed in claim 1, wherein said pull chain disc (31) is accommodated in a housing (1a) of said door machine (1), said ring plate (41) being provided on the right end face of said pull chain disc (31), a plurality of through holes (1b) corresponding to said openings (411) of said ring plate (41) being provided on said housing (1a);

said base plate (43) being fixed at an outside end face of said housing (1a), said base plate (43) having a space for receiving said passive plate (44) therein, said passive plate (44) having at least one pair of plug pins (441) provided within said through holes (1b) of said housing (1a).

3. The brake release device as claimed in claim 2, wherein each of said plurality of plug pins (441) includes a small diameter segment (441a) at one end thereof with an end portion of said small diameter segment slidably disposed on the passive plate (44);

a spring component (442) being arranged to encircle the periphery of said small diameter segment (441a) with one end thereof abutting against said plug pin (441) and the other end thereof abutting against said passive plate (44) so that said plug pin (441) has a tendency to restore to its original position during sliding.

4. The brake release device as claimed in claim 3, wherein each of said plurality of plug pins (441) has a small diameter end (441b) formed at one end facing said ring plate (41);

when said brake release device (40) releases the brake, said small diameter ends (441b) of said plug pins (441) are inserted into said openings (411) so as to lock said pull chain disc (31) into an irrotational state.

5. The brake release device as claimed in claim 1, wherein said brake device (10) comprises:

a support stand (11) arranged to encircle the outer periphery of said axle (2) of said door machine (1) and received in said housing of said door machine (1), said support stand (11) having a plurality of guiding rods (111) fixed at one end and disposed to be parallel with said axle (2);

a moving disc (12a) movable in an axial direction of the axle (2) by being guided by said guiding rods (111);

a stationary disc (12b) provided at the other end of said guiding rods (111) and is arranged to face said moving disc;

a braking component (13) including a sliding portion (131) and a brake disc (132), said sliding portion being arranged on said axle of the door machine such that the sliding portion is movable in said axial direction of the axle by a predetermined range, said brake disc (132) being arranged to be interposed between said moving disc (12a) and said stationary disc (12b), brake linings (133) being provided on both sides of said brake disc (132) so as to be in frictional engagement with said moving disc (12a) and said stationary disc (12b);

at least one compression spring (15) having one end biasing against said moving disc (12a) so as to urge said brake disc (132) against said stationary disc (12b), to thereby clamping said brake disc (132);

an electromagnet (15) arranged to oppose said moving disc (12a) and configured to retract said moving disc (12a) when energized, so as to disengage said moving disc (12a) from said brake disc (132), to thereby releasing said braking component (13); and

a restoring spring sheet (16) having one end disposed on an end face of said sliding portion (131) and the other end abutting against said axle (2), and is compressed when said brake disc (132) is clamped, and when said moving disc (12a) is retracted to disengage from said brake disc, the restoring force of said spring sheet acts on said sliding portion (131), so as to disengage said brake disc (132) from said stationary disc (12b).

6. The brake release device as claimed in claim 5, wherein said brake release bar (20) comprises a U-shaped portion (21) at the other end thereof, both end portions of said U-shaped portion (21) being pivotally disposed on said stationary disc (12b), projections (211) being provided on said end portions of said U-shaped portion (21) to abut against said moving disc (12a), when said brake release bar (20) is actuated by an external force, so as to disengage said moving disc (12a) from said brake disc (132).

7. The brake release device as claimed in claim 6, wherein said brake device (10) comprises a sensor switch (17) electrically connected to the circuit of said door machine (1);

said U-shaped portion (21) of said brake release bar (20) having a contact arm (212) that triggers said sensor switch (17) to switch off the circuit of said door machine (1) when said brake release bar (20) is actuated by the external force to release the brake.