US1615767A

US1615767A - Electrical brake

Info

Publication number: US1615767A
Application number: US695123A
Authority: US
Inventors: Harold V Mccormick
Original assignee: WARNER ELEVATOR Manufacturing Co
Current assignee: WARNER ELEVATOR Manufacturing Co
Priority date: 1924-02-25
Filing date: 1924-02-25
Publication date: 1927-01-25
Anticipated expiration: 1944-01-25

Description

Jan. 25, 1927,

H. V. MCCORMICK ELECTRICAL BRAKE Filed Feb. 25, 1924 2 Sheets-Sheet l Inventor HAROLD V MCCQRM/cx.

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IIIIIIIIA u fill/lill l Jam 25, 1927. A H. V. MCCORMICK ELECTRICAL BRAKE Filed Feb. 25, 1924 2- sheets-sheet 2 Patented Jan. 25, 1927.

PATE-NT omen.

HAROLD V. MCCORMICKQ OF' CINCINNA'FI', OHIO; ASSIG-NOR'TO WARNER ELEVATOR MANUFACTURING COMPANY, 0F CITGNNATI, OHO, A CORPORATION OF OHIO.

ELECTRICAL BRAKE.

An objet-tot` my invention istoprovidean electricalhrake `wherein fluid means may be employed for retarding thelotherwise rapid movementot` the armature associated with such brake apparatus. f

Another object of my invention is to provide astructure Whereinthe -tinid retarding means becomes anintegral part ofthe armature fory eliminating vibra-tionfbetween them.

Another object of my invention is toV provide a structure thatwill elect a slow movement of release and a rapid movement ot operation without the use of checlcvalves Ol other meansot changing theeffect ot v`fluid flow from the fluid armature retarding means.

Another object isto provide means for clampingA the laminationsof a laminated steel. electromagnetic field f, and armature for securing the laminations against'all lateral movement.

AnotherA object offiny invention is to provide aV simple and elificient device for the purposes as stated.

These and other object-s are lattained by meansdescrihedherein and disclosed inthe accompanying drawings, in which:

Fig. 1 is aside elevation of the device embodying my invention.

Fig. 2' is a sectional-view on line 2,-2 of Fig. 1.

Fig. 3 is an elevation of an-electromagnet core forming a detail of my invention.

Fig. 4 is an elevation showing at right angles thereto, the structure disclosed in Fig, 3. h

Fig. 5 is a sectional view on line 5 5 ot Fig. 3,

G is an enlarged detail view of an armature forminga detail of myinvention.

Fig. 7 is a sectional view on line 7--7 ot Fig. 6.

Figs. 8 and 9 are diagrammatic views of wirings or coils forming details oft my invention.

The base 20' may be mounted on any suit-- able foundation 21 in any suitable manner, for example as shown, and may be bolted thereto. The casing 22 comprises spaced sides 23 and rllhc base20 supports al casing 22.V

Application ledebrnary'25, 1924. Seria1--Ngoz 695,123.

24. The sides are provided with openin s 25y therethrough and .a Shaft 26 extends through said-openings, The shaft 26' carriesahdruln 27 v1190,11 which brake shoes 28v from .displacement onlsaid casing. by provid! a- .boss 36` uponv .the casing -and which boss may enter the center of the spring, Ahand lever 37 is provided wherebythe screwmay beadjusted through the arm tormodifying thecompression of the spring. and consequently modifying the friction where with the. shoe 28 engages the drum. The upper end ofthe armf() is bifurcated, the

branches

39 and 40 thereotl supporting the pin 38.- The pin 38 is pivotally mounted upon thebranches 39and 40 and carries a block 41iiro1n which extends the screw 42.

` Theblock is provided with bores 410 any of which will receivepin 38 for adjustment of the lever 44.v The U-shaped lever 44 has its one branch 45 adjustablymountedupon the screw 42 and may be secured vin adjusted positions by the nut 43. lt should be noted that this structure `gives a very elicient operating leverage'throug-h which the armatures mayactvupon the brake shoes. The arm 46- of the lever 44- eXtends throughan opening 47 in the cover 48 of the casing 22 and carriesA a disc like flange Z 2 that serves as a closure tor opening 47. rlhe casing comprises internal ribs ortransversely eX- tending

walls

49 and 50. The ribs in part are spaced from the bottom 51 of thepcasing wherefore passages Vare provided between the chamber 53 at the center of the casing The second end of' the spring icc and the chambers 54 and 55 formed in the casing 2Q exteriorly ot the walls or ribs 4!) and 50. The

walls

49 and 50 are provided with apertures 56 through which plungers 57 reciprocally extend, whereby a dash pot structure is provided between the plunger and the wall as is disclosed in Fig. 2. The outer end ot' each plunger 57 is bifurcated and carries a pin 300 on which pin is pivotally mounted the branch 46 of the lever 44. The inner portion ot the plunger has mounted upon it a magnet field 58 comprising laminations 59 secured between side plates 60 and 6l by any suitable means such as bolts and nuts (32 and all ot which constitutes an armature.

The

walls

49 and 50 are provided with inwardly extending flanges 63 and 64 for the reception of the magnet field, the recessed portions of the wall constitutes a retardation cylinder containing' the field or armature. The field 58 is actuated by an electromagnet 66 disposed centrally of thecasing 2Q. The electromagnet comprises laminations 67 secured between

end plates

68 and 69, which end plates are mounted upon the casing. By reference to Fig. 3 it will be apparent that the core comprising the laminations 67 and end plates is so constructed that 4 notches are provided at the opposite edges et the cores, tor the recept-ion ot a pair of

coils

70 and 71 at both sides ot the magnet core. The coils may be electric-ally connected as shown in Figs. 8 and 9 for effecting any desired phase operation. The casing contains an insulating fluid such as oil and in which fluid the eleetromagnet and armatures are immersed.

The

sides

23 and 24 of the base 20 carry adjustment screws 73 for engagement upon the

bralre shoes

28 and 29 for limiting the movement of the lower ends of' said brake shoes from the drum and for effecting adjustment ot' the bralre shoes to a concentric relationship to the drum and the shaft 26.

The operation of my device is as follows:

Normally the electromagnet is deener.

gized wherefore the brake shoes engage the drum and trictionally resist rotation of the drum. The springs 35 function as the means lor efiecting this frictional resistance. When the drum is to be released the electromagnet is energized whereupon the armatures or magnet fields are drawn toward the electromagnet thereby moving the arms about their pivotal mountings 3l and moving the brake shoes away from the drum. The dash pot structure or retardation structure, in combination with the proportioning ot the levers and the co-acting 'forces pointed out herein, effects a slow release of the drum. lt will be observed that when the drum is released the movement of the armature is resisted both by the springs 35 and the flow oi the fiuid in the casing. When the electromagnet is deencrgized the springs 35 return the parts to their normal positions. On deenergization ot the electromagnet the springs need overcome only the resistance ot the dash pot structure whereby a comparatively rapid movement ot application of the brakes is effected. lt will be observed that by providing side plates between which the laminations of the field or armature are bolted, all lateral movement of the laminations is precluded. It will be noted that no check valves are required for controlling the flow of duid in the casing yet a variation in the speeds of application and release of the brake is effected.

Attention is directed to the structures of the armature and magnet core structures. it will be noted that the bolts that secure the laminations do not pass through perforations in the laminations but lie in slots at the edges of the laminations. The slots are of a depth less than the diameters of the bolts wheretore the clamping means are isolated trom the area ot luX as a result of which heating of the bolts is precluded. rlhis structure also has an advantage in that local actions or closed areas of excitation about the bolts are avoided, thereby eliminating the reduction in general etticiency and avoiding the undesirable local reactions incident to local actions. There is no flow of current through the bolts longitudinally and the presence of the bolts does not distort or modify the normal flux flow through the laminations.

What l claim is:

1. In a device of the class described the combination with a drum, ot' a brake shoe tor `trictional engagement with the drum, a lever pivotally mounted intermediate its ends and having the brake shoe mounted at its one end, a U-shaped lever mounted at the second end of the first mentioned lever, yielding means operative upon the rst mentioned lever causing the trictional engagement between the drum and the brake shoe, a fluid containing casing, a wall eX- tending transversely ot' the casing and having a recess formed therein, a fiange extending from the wall forming a retardation cylinder, an armature having a rear plate reciprocable through the retardation cylinder and recess and connected with the U- shaped lever, and an electromagnet infiuencing the movement of the armature and lever in one direction, and the retardation cylinder and recess modifying the action oit' the yielding means on the brake shoe in the other direction.

2. In a device ot the class described the combination of a drum, a brake shoe for trictional engagement upon the drum, means :tor actuating the brake shoe and means for modifying the action of the brake shoe actuating means, the last mentioned means comprising a fluid containing casing having a wall extending transversely of the easing, the Wall being provided with a recess, a flange extending from the Wall for providing a retardation cylinder, an armature reeiproeable in the retardation cylinder and comprising a plate, the plate being reciprocable in the recess, the recess and plate forming a dash pot structure whereby the brake shoe actuating means is Inodiied.

In testimony whereof, I have hereunto subscribed my naine this 8th day of February, 1924.

HAROLD V. MCCORMICK.