US1546864A - Electric brake - Google Patents

Description

July 21, 1925'. V 1,546,864

T. B. PATCH ELECTRIC BRAKE Filed June 8, 1922 UNITED STATES tassel PATENT OFFICE.

THEODORE B. PALTGH, OF BROOKLINE, MASSACHUSETTS.

mnc'rnrc BRAKE.

Application filed June 8,

To all whom it may concern! Be it known that I, THEODORE B. PATCH, a citizen of the United States, and a resident of Brookline, county of Norfolk, and Commonwealth of Massachusetts, have invented an Improvement in Electric Brakes, of which the following description, in connection with the accompanying drawings, is a specification, like characters on the drawings representing like parts.

This invention relates to brakes for vehicles and particularly to electrically operated brakes, and aims to provide an improved form of construction therefor, and

. one particularly adapted for use on the front wheels.

In the drawings of one embodiment of my invention selected for illustration and description herein,

Fig. 1 is a side view of a conventional wheel with a brake drum thereon;

Fig. 2, a vertical section through the drum in the line 22, Fig. 3, showing a side view of the brake shoes and cooperating parts; and

Fig. 2, showing the method of mounting the brake shoe and anchors.

Referring first to Fig. 3, my improved construction is shown as comprising a head or support 1 of brass, or any suitable nonmagnetic material, mounted upon the steering knuckle 2, of a front wheel, and thus of course adapted to turn therewith. This head is provided, Figs. 2, 3, on its inner face on the curved supporting rod 13 mounted in posts 14. on the support is a movable stop in the form of an electro-magnet 15, hanging adjacent to but kept normally away from the drum 10 by a weak spring 10*. The wires 16 from the magnet extend through an aperture 17 to any source of electric energy, as a battery 21. The ends of the core of Fig. 3, a vertical section on the line 3-3,

1992. Serial m. 566,851.

the magnet are tipped withsome non-magnetic material 18, as brass, to prevent diversion of the magnetic flux from its proper course and energizing the shoe. I

The method of operation is as follows: When it is desired to apply the brake the magnet 15 is energized, through the instrumcntality of any desired controlling switch or, means, not shown, and it immediately attaches or anchors itself to the drum 10 adjacent to which it normally hangs suspended and becomes a fixed stop for the shoes. The coil spring 10 is sufliciently long and flexible to permit the limited travel of the member 15 required in the above described operation without detriment to the spring. The rotation of the wheel and attached stop 15 causes the latter to engage one end of one of the shoes 6, 7, according to the direction in which thevehicle is moving, and it forces the shoes outwardly against the flange 9 of the drum with suflicient force to apply them firmly thereagainst and stop the car.

Upon the opening of the battery circuit and deenergizing of the magnet it is drawn away from the drum by the spring 10 and it naturally slides down its curved support 13 to central and inactive position again.

To prevent the shoes 6, 7, from rotating too far with the drum 10, if there should be an inclination to do so, they are each provided with an car 19 which, after the shoe has travelled a limited distance, engages an ear or fixed stop 20 in tandem relation to the stop 15 on the head, and thus prevents further movement of the shoes the stop 20 in such case assisting in stopping the rotation of the drum and movement of the car through the action of the shoes thereon.

It will be noted that the brake is a double acting one, that is, it acts in either. direction and utilizes the motion of the wheel as a breaking force. The brake may be used on either the front or rear wheel, is free of complicated mechanism, such as universal joints and stop joints, and is simple in construction and sure in operation.

My invention is not limited to the particular embodiment thereof shown and described, and I claim:

1. An electric brake for motor vehicles comprising a drum, a support, a movable magnetic stop member on the support, a brake shoe detached from the stop member, and means to cause the movable stop to anchor itself laterally upon the drum in the path of the shoe and to expand the shoe against the dru'm.

2. An electric brake for vehicles comprising a drum, a shoe support, a brake shoe on the support, a, magnetic stop member within the drum, and means to anchor the stop member to the drum and cause it to driv the shoe'against the drum.

3. An electric brake for motor vehicles comprising a drum, a support, a movable stop thereon, brake shoes on the support, means for electrically anchoring the movable stop upon the drum end between the shoes and to expand the shoes against the drum.

4. An electric brake comprising a drum, a support, brake shoes thereon, a fixed stop on the support, an electro-magnetic stop movable in a curved path on the support, and means to energize the magnet to seat it against the drum and cause it to expand the shoes against the drum.

5. An electric brake comprising a drum, a support adjacent the drum end, brake shoes thereon, an electromagnetic stop movably mounted on the support, and means for energizing the stop to anchor it to the drum end in the path of the shoes and to throw them against the drum.

6. An electric expansible brake comprising a drum, a support, brake shoes thereon, an 'electro-magnetic stop movable laterally and circumferentially on the support, and means to energize the stop to anchor it to the drum end while suspended from the support.

7. An electric brake for vehicles comprising a drum, linked brake shoes therefor, a fixed stop and a movable stop on the support and within the drum, and means to anchor the movable stop to the drum between the shoes and thereby cause the stop to throw the shoes radially toward the drum.

8. A motor vehicle brake comprising a support, brake shoes thereon, a fixed stop with a movable stop slidably supported thereby and between the shoes,'m'eans to ansupport, brake shoes thereon, a stop member suspended between the opposed ends of the shoes, and means to anchor it against the drum end and thereby cause it to'push the shoes against the drum.

.11. A motor vehicle brake comprising the support 1, brake shoes .6, 7, thereon for circular and outward movement, the drum 10, enclosing the support and shoes, stop rod 18 on the support, the movable stop 15 on the rod 13, and means 16, 21 connected thereto, to anchor the stop 15 against the drum end to throw the shoes-against the drum. I

12. A motor vehicle brake comprising a support, a drum, movably connected brake shoes within the drum, guides for the shoes and supporting the same, a fixed brake stop within the drum in the path of the shoes, a movable stop on the support, and means to anchor the movable stop to the drum end and thereby to cause it to push one brake shoe radially and circumferentially against the drum.

13. An electric brake comprising a support, brake shoes, a fixed stop therefor and a movable stop therefor disposed in tandem relation on the support, a drum enclosing the stop and shoes, and means to anchor the movable stop to the drum to cause the stop to engagethe shoes and throw them radially against the drum.

14. An electric brake comprising a support, a brake shoe thereon, a. fixed stop on the support, a movable stop also thereon and means to move the movable stop across the path of the shoe to anchor the stop and thereby cause the drum to drive the shoe against the drum flange.

15. An electric brake comprising a drum, a support, brake shoes movable circumferentially relative to the drum and within the same, a fixed stop for the shoes adjacent their paths of movement, a movable stop in the path of movement of the shoes and means to anchor the movable stop between the shoes to cause it to throw them radially and circumferentially against the drum.

.16. An expansible brake comprising a drum, a support, shoe guiding flanges in a curvilinear path thereon, a shoe on the support and between the flanges and drum, a traveling stop member'on the support detached from the shoe'and within the path of the shoe, and means to anchor the stop member laterally on the drum and in the path of the shoe.

In testimony whereof, I have signed my name to this specification.

THEODORE B. PATCH.

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