USRE18024E - bastien - Google Patents

Description

Reissued Apr. 7, 1931 UNITED STATES PATENT oer-1c]:

ra n. mm, or mnsme, MICHIGAN. ASSIGNOR T0 nmmrx Imam comm, or crncaeo, ILLINOIS, A conromrrou or rumors KULTIPLYING BEG-MENTAL Original application fled February 11, 1924, Serial No. 682,196. Renewed Kay 5, 192a. Original Io. 1,697,838, dated January 1, 1929. Application for reissue filed July 21, 1980. Serial 1T0. 469,571.

therefrom with the same or less power appliedto the actuating parts as is now applied thereto. 1

Another main feature of the invention consists in arranging the brake shoe such that the greater portion of its total surface will be operative for braking in forward driving and but a minor portion of its total surface will be operative for braking in reverse driving.

The brake, therefore,-is constructed for normal usage.

Another main feature of the invention is to construct the brake shoe in such a manner that it will be of the articulated type, having a plurality of sections connected together and movable into braking position and engaging the drum by a'plurahty of means operable from a common source.

A third main feature of the invention consists in the multiplying feature disclosed herein and which is associated with the two before-mentioned features, to secure a most highly desirable and most effectively operable brake.

Another chief objectpf the invention is to secure a brake construction which is self-acting, in that the movement of the vehicle 0 erates to increase the' braking force app ied thereto by the vehicle u on by the operator of the ve 'cle. It will be furthermore understood that in each instance .the weight of the vehicle and the possible rake initiation In the drawin Figure 1 is a sectional view of a diri 'b e wheel equipped with an expanding bra e construction supported by an axle.

Figure 2 is a side elevational view of the brake drum shoe and associated parts,

Figure 3 is a sectional view taken on the line 33 of Figure 2 and in the direction of the arrows, and

Figure 4 is an elevational view of the spindle and wheel mounting shown in Fi re 1.

Tu the drawings, 10 indicates an a e carrying the sprin means 11 for sup orting the framework of t e vehicle. An 0 set portion 12 of the axle terminates in the king pin recelving portion 13, having an axis inclined to the vertical. A spindle 14 is provided with the usual king pin upper and lower bearings 15 and 16, which support said spindle at an angle to the horizontal. The

spindle 14 carries the wheel construction including the hub17, and to said hub or any the spindle construction and movable therewith is a closure or backing plate 21 provided with a slot 22 and also depressed or formed at so as to form a relatively complete closure.

Extending through the slot 22 is a shaft 23 which terminates in a substantially spherical cam 24 having an enlarged portion 25 for actuating the brake in one direction only. The shaft 23 is pivotally supported in a bracketor guide 26 rigidly attached to the axle 10, bybeing formed integral therewith as herein disclosed. The shaft 23 is extended as shown at Y123, and associated therewith is a lever 27 which is suitably actuated from the vehicle. Thus the brakes upon two opposite wheels can be applied-from a common source; and when the brakes are applied to four wheels, any suitable linkage or equivalent construction may be provided for actuating all four brakes simultaneously.

It will be readily apparent that applica-' tion of the brake to non-dirigible wheels is relatively simple compared with the application of the brake to a dirigible wheel. Herein the latter application is illustrated because it is the most complicated. The essential feature necessary is to secure cilicient bra-king action without interference with the dirigible action of the wheel and to secure efficient dirigible action without interfering with the braking action. This arrangement requires that the actuating portion, to-wit, the cam' 24, terminate at the kingpin axis uponwhich the wheel is dirigibly mounted, and preferably at the intersection with the plane of the brake drum or a plane parallel thereto. Herein such a plane is the median plane of the brake construction and is suitably indicated by the dotted line. As shown in Figure 1, there is associated with the spindle an actuatingconstruction 28 terminating in a portion'29 connected with the steering mechanism of the vehicle,

whereby the dirigibly mounted wheel is adapted to be guided.

The foregoing includes many minor features of the invention and the following includes the major features of the invention. Herein as shown clearly in Figures 2 and 3 to which reference will particularly be had, there is illustrated a yoke-shaped support 30 suitably secured to the plate-21, and in said yoke there is provided a pivot 31 which pivotally supports or anchors the drum engaging construction herein shown of the expanding type, and, therefore, a'shoe. The

shoe is of suitable and herein T-shaped cross section, see Figure 1, and in the present invention the shoe is comprised of an articulated construction; the same in this instance being secured by hinging the shoe sections 32 and 33 together at 34 by the pin- The yoke 30 is provided with an extension or abutment 35 upon which the circular portion 24 ofthe cam 25 is adapted to bear. As shown clearly in Figure 2, the "articulated shoe includes a surface adapted to engage substans tially more than half of the brake drum.

Associated with said articulated shoe construction is a means for actuating and moving the same into drum engaging position- Herein such a mechanism includes a similarly formed but much smaller surfaced shoe section 36 which terminates at 37 in a bearing surface adjacent the cam 25 and engageable by 'said cam. A pin 38 is carried by the plate 21 and suitable washers 39 restrain said shoe from lateral movement but permit arcuate movement with respect to the wheel drum axis when engaged by the cam 25. For this purpose the shoe section 36 is provided with a curved and elongated slot 40. The opposite end of the shoe section 36 includes a pivot 41, which pivot is connected to a lever 42 pivotally supported at 43 upon the plate 21. The lever 42 intermediate its ends is provided with an oscillating joint 44, and ad j'ustably associated with said oscillating joint is a link 45 pivotally connected at 46 to the free end of the articulated shoe construction previousl described. Herein the lever 42 is of the bell crank type, having an extension or arm 47; and pivotally supported at opposite ends of the adjustable link rod 48 is the lever 47 and the pivot 34 at one of the articulations.

The bearing surface 37 is provided with an extension 49 adapted to engage an adjustable abutment 50 which limits the return movement of the shoe section 36 when actuated, as hereinafter to be described. The abutment 49 and the yoke 30 are provided with a hook portion 51 to which is secured a coil spring 52 for normally retracting the shoe section 36 into its non-engaged position and to main tain the same in engagement with the cam 25.

The operation of the foregoing braking construction is as follows: When the shaft23 is rocked counterclockwise as shown by the arrow, see Figure 2, the cam 25 engages the surface 37 and causes the shoe 36 to move circumferentially of the drum and in the direction of rotation of the drum when the vehicle is driven forward. Such movement causes the drum to engage the surface of the shoe and to pull it with a force roportional to the frictional force produced by the engagement. Such a force is exerted through the pivot 41 upon the lever 42 pivotally supported upon the late 21 at 43. It may be assumedthat the s we construction is not articulated. With this assumption, it will be understood that theforce opposing said force applied .to the lever 42 is the force exerted through the link rod 45. Thus, a multiplying result or ratio is obtained, dependent upon the ratio of the lever arms, to-wit, the perpendicular distance between the application of forces from the pivot 41 to the pivot 42 and from the pivot 44 to the pivot 43. Thus, a multiplying effect is secured which is transmitted to the articulated shoe construction 32-33. To increase the effectiveness of such braking action and also to insure relatively quick release, the lever arm 47 is provided and this lever arm transmits part of the force applied to the pivot- 41 which otherwise would be transmitted through the pivot 44, and thus the excessive strain exerted upon the pivot 46 is reduced because a portion of it is exerted through the pivot 34. It will be remembered that the articulated shoe section is anchoredat 31. 1

In reverse drivin which is generally at a much slower spee than forward driving, the amount of braking power required is not as great. Therefore, n reverse driving, the cam 25 engages the abutment 37 and orces the shoe section 36 into engagement with the drum now revolving counterclockwise. This, then is direct braking action for section 36; but due to the direction of drum rotation, the articulated shoe construction does not engage the drum for any reverse braking action. In either instance when the shaft 23 is actuated, and thereafter released, the spring 52 provides a means for returning all of the parts to the released position, determinable by the adjustable stop 50. Herein the articulated shoe construction is shown provided with but one pivot or hinge. It may be here noted that the plate 21 carries a guide 53 7 adapted to slidabl receive a stem 54 carrying the adjusting an locking nuts 55, whereby the released position of the lever construction pivoted at 43 is determined. Herein the invention illustrates an unbalanced braking surface for forward and reverse braking. The broader feature of the invention includes the self-multiplying feature.

While the invention has been described-in great detail in the foregoing specification and various modifications thereof, others will readily suggest themselves to those skilled in the art to which this invention applies, all are to be considered as within the scope of the ap ended claims, and the foregoing detailed escription is to be considered as illustrative and not restrictive in character.

I claim:

1. In a brake construction, the combination of a pair of pivotally connected shoes, a third shoe, a link connected to the pair of shoes at the pivotal connection, another link connected at one end to the opposite end of one of said connected shoes, a lever connected at one end to the third shoe and movable thereby and at the-other end to one of said links and to the other link intermediate the lever ends, and means for moving said third shoe into and out of braking engagement.

2. .In a brake construction for a wheel, the combination of a brake drum, at least three drum engaging means, one of said drum engaging means being anchored at one end, another of said drum enga ing means being movable at one end into an out of engagement with the drum, and leverage means connecting all of the other ends of the several drum engaging means together, whereby -upon relative rotation of the drum in one di- 4. A brake comprising, in combination, a

pair of pivotally connected shoes, and a third shoe connected to the pivotally connected ends of said pair of shoes.

5. A brake comprising, in combination, a pair of shoes and arranged end to end and having a connection between their adjacent ends, applying means acting on the unconnected end of one of the shoes, and auxiliary applying means acting on the connection between the shoes.

6. A brake comprising, in combination, a pair of shoes arranged end to end and connected at their adjacent ends, applying means acting on the unconnected end of one of the shoes, and auxiliary applying means acting on the connected ends of the shoes.

-7. A brake comprisin in combination, a drum, a shoe, a device or forcing said shoe against the drum, an auxiliary shoe engageable with the same zone of the drum as the first shoe and operating said device and separate auxiliary means for forcing the first shoe against the drum.

8. A brake comprising, in combination, a first shoe, a second shoe at one end of the first shoe, a connection between said shoes, a third shoe at the other end of the first shoe, and means through which the third shoe acts on said connection to apply the first shoe.

9. A brake comprising, in combination, a drum, 9. pair of shoes engageable with the drum, a device through WhlCh one of said shoes forces the other against the drum, and an auxiliary shoe also acting on said device.

10. A brake comprising, in combination, a drum, a pair of shoes engageable with the drum, a pivot connectin the shoes, an auxiliary shoe, andbrake-app ying means operated by the auxiliary shoe and acting on the pivot.

11. A brake comprising, in combination, a drum, 2. pair of shoes engageable with the drum, a pivotconnecting the shoes, an auxil iaryshoe, and a linkage connecting the auxiliary shoe and said pivot.

In testimony whereof, I have hereunto signed my name. I

" PAUL BASTIEN.

' ,rection the entire drum engaging means is

Images