US1532286A - Snubber - Google Patents

Description

April 7,1925. 1532,286

' H. D. WEED SNUBBER med Sept. 24, 1924 INVENTOR 1 01.20 Weed I ,5 ,wvlmm I ATTORNEY Patented Apr. 7, i i iife HARRY ID. WEED, OF SYRACUSE, ili'lEW YORK, ASSHGNOE T i-Q 'Ei'wIH-ifi 53E313 $20M KAHY, me,

A QUE! ORATIfiN OE NE? SIG Application filed September 534., 192%. Serial We 1393,5491

To all whom it may concern:

Be it known that I, HARRY nwm, e citizen of the United States, residing at Syracuse, in the county of Onondaga, State of New York, United States of America,

have invented certain new and useful Improvements in Snubbers, of which the following, taken in connection with the accompanying drawing, is e specification.

This invention relates to devices common-- ly known as snubbers, employed for modifyring excessive vertical oscillations of spring supported vehicle bodies such are caused by irreguiarities in the road 31 ce.

The object of the inventioi :o consiaruct a device: of the strap-undo type for this purpose, characterized by the @rovision of means to vary the degree oi resistance to recoil oi the vehicle springs as the recoil. isizing force,

movement prcgresses the res however remaining m I .ihis o yect 1s 1/1 t providing the drum.

or e

cable, or other fiexihie. drai telenientwhenthe letter is wound thereon, the extension acting automatically to vary the momentof rotation of the frictioueieiuent about the drum. This peripheral enlargement is desirably formed a separate port of crescentshupe secured firmly upon the friction element, so that as the letter is rotated flexible element is tangentsucoessively to peripheral portions of the crescent dithering; progressively as to rediei extent in suitable proportion to the progress of the recoil movement.

v Referring to the drawing. 1-

Figure 1 is anelevetion in section on the line 11 of Figure 2.

- Figure 2 is a side elevet 'ir. In my preferred embody; cut, the resistance to recoil of the vehicle springs, (which are not shown herein,'not forming any part of i this invention,) is created mainly by friction, this friction arising out of the rotetion of a, suitable split friction-hand 1, consisting for exampleof-ordindry brake-lining surrounding theperiphery'of a brake-drum indicated as a whole by the numeral 2. This drum consists of e suitable back plate 3 turned-over end 26 of the'steei bend 6; at

from which projects a eentrai hoiiow huh &' and else the annular flange or projeetien 5', the periphery of -which serves esone of t .e brake surfaces. In order to stiffen the brake-lining it is etteehed to a split fiexihie, steel band 6 which preferably tends nor-- mully to cause the hrel-:e-iir" g to he slighl sprung away from 1 brake-surface on permits the i J *u; properly on streiued such. rotation,

The actuating causing rotation may consist of u, c i n e-out the outer periphery through 79 e suiiicient ore to 1 the maxim extent of verticei cs: iiiieiy to hike piece under i'tio-ns of service. The may I '-.rictieu i the connected in the drum lifieans ting oi may he used for menu mg tension against the (I no one, end of the he red to the has 1 late 3 hooking it hroue i the ep If ture '11. The free end of the si ning is secured to an arm 12 rotetehly mounted on 21 journal 13 projecting from the hub 4. The spring, as may he observed from the'drewiugs, is designed to exert its force in e direction to rotate the hand against the tension of the cable 7, i. e, in counter-clockwise direction as indicated by the arrow D in Figure 2. The arm 12 is provided with e turned over portion 14 which abuts against the the end of the brake lining, and exerts its force in the direction. of the arrow D in Figure 2; i. e., in such e direction esto keep the cable 7 under constant tension. The free end 15 of the spring I'U. may he conveniently enchored by hooking it through an aperture 1% in the'erm 1e. i

On the steel band 6 assesso is aradial extension or enlargement 16 which may take any de-' sired form for accomplishing the purposes of the invention. In the drawings I have shown this extension viewed from the side of crescent shape as being formed as a s parate member secured to the band 1 by rivets 17'.

i Vhen the radius of band coincides with that rotation of the brake radius which passes through the point of tangenoy of the cable with the thickest portion of this crescentshaped extension, the

moment of rotation is obviously at the maximum and the resistance to rotation of the friction-band. on the drum is at a minimum. These quantities vary from point to point on the extension 16 as the band revolves, and it is obvious that by suitably prop sions of the extension, tion in the moment of cured.

Ordinarily, it is desi to a minimum when the vehicle are rel the vehicle as a whole rotation of the brake-band sh ortioning the dimenany desired variarotation may be sered that the resistance all be at body and axle of the atively at rest, whether or not be in motion. It may be assumed for purposes of illustration and explanation that the Figure 2 are in the parts as, shown in position which they would occupy with the vehicle and axle relatively at rest. junction 'OA and the brake-band is arrangement permits h'cle springs The radius of is, therefore, resistance to then at its minimum. This revolution at as indicated by rotation of the the conventional veto function With-comparatively reduced resistance until the oscillations exceed a predetermined amplitude. If, how

ever, a compression of the vehicle springs takes place the radius of revolution decreases as the extension wardly by the action working through arm it may be assumed th comes the radius of revolution tremity of a compression.

to turning is, thereto commencement of a recoil 16 is revolved upof. the coil-spring 10 12 and band 6, and at the ,radius OB be--' at the ex- The resistance a maxium at .the movement. This resistance decreases until the radius 0A again intersects the point of tangency of the cable, and thereafter, as the recoil movement continues, the resista :z'eachino' a maximum when,

nce again increases,

for instance, the

radius @C intersects the point of tangenoyof the cable.

As stated above, the character of the changes which t amount of resistance is a ake place in the matter ofchoice to be determined in viewof the )urposcsto be accomplished in the have described and sh particu ar case. own an apparatus in which the changes are characterized in a way that I have found suitable under many conditions. I am aware, however, that the opinions of those fa Imhar with the art of the extension,

vary on this question, some being of the opinion that the resistance should be at a minimum at the commencement of a recoil movement and should increase to a maximum as the movement approaches its extreme. On the other hand, it is the opinion of others that the resistance should be a maximum at the commencement of a recoil movement and gradually become reduced as the movement approaches its extreme. Any of these requirements, however, can, as is obvious, he satisfied by suitable modification of the shape which is well within the skill of the ordinary mechanic, or in the case of an extension of given dimensions by initiall setting the drum at'the particular angu ar position Which will desired result.

Having thus described my invention, I claim 1. In a snubber, a brake-drum, be connected non-rotatively with one of two spring-connected members of a vehicle; a rotatable friction element surrounding the periphery of said drum; a draft-element coacting peripherally with said friction element to cause rotataion thereof and adapted to be connected with the other of said two spring-connected members of the vehicle for actuation thereby; moment of rotation of said friction element about said drum, said means comprising a peripheral extension upon said friction element at a, portion thereof co-operating with said draft element.

2. In a snubber, a brake-drum, be connected non-rotatively with sprin -connected members of a flexib e, rotatable, friction-element ing the periphery of said drum; draft-element connected with said element and coiled about the same and adapted to be connected with the other of said two spring-connected members of the vehicle; and means to vary the moment of said frictionselement about said drum, said means comprising a peripheral exten sion upon said friction-band, at a portion thereof co-operating with said draft-element.

3. In a snubber, a brake-drum and means to connect said drum non-rotatively with one of two spring-connected members of a vehicle; a flexible, rotatable friction-band surrounding the periphery offlsaid d1 flexible draft-eleinent coiled about, and consaid 'friotionelemeut, connected with the adapted to one of two vehicle; a surrounda flexible friction-- vehicle; and means to vary the moment of rotation of said friction-element about said drum, said means comprising a peripheral enlargement upon said b of difi'erent pyjla dial extent, to be engaged progressively said flexible draft-clement.

and means to vary the of rotation 3 um; a

produce the adapted to 7 llf) and

and having portions of rotation of said flexible brake-band about said brake-drum, said means intervening between adjacent co-operat-ing portions of said flexible draft-element and said brakeba-ndand comprising aradial extension or enlargement of said flexiblebrake-band.

5. Ina snubbei', a brake-drum, a flexible brake-band, and a flexible draft-element, superimposed co-axially in the order named, and said brake-members being arranged for retarded relative rotation by said flexible draft-element, during unwinding thereof upon development of tension on said snubher in use; means tending continuously to wind said draft-element on said brake-members when the tension thereon is relaxed; and means to vary automatically the moment of rotation of said flexible brake-member about said cylindrical member, said means intervening between: adjacent co-operating portions of said flexible draft-element and said flexible brake-member and comprising a crescent-shaped radial extension or enlargement upon the periphery of said flexible brake-band.

6. In a snubber, a cylindrical brake-drum, a flexible brake-band, and a flexible draftelement, superimposed co-axially in the order named, and said brake-members being arranged for retarded relative rotation by said flexible draft-element, during unwinding thereof upon development of tension on said snubber in use; means tending continuously to Wind said draft-element on said brake-members when the tension thereon is relaxed; and means to vary automatically the moment of rotation of said flexible brake-band about said cylindrical member, said means intervening between adjacent cooperating portions of said flexible draftelement and said flexible brake-band and comprising a radial extension or enlargement of said flexible brake-member, taking the form of a crescent-shaped part formed separately, and secured upon the periphery of said flexible brake-member.

7 In a snubber, a brake-drum, a peripheral brake-band thereon, and a flexible draftelement wound upon said brake-band and connected therewith, said brake members being arranged for'relative retarded rotation by said flexible draft element durin unwinding thereof upon development oi tension on said snubber in use, and a. coiled spring tendingcontinuously to windsaid draft-element upon said brake-band when said tension is relaxed; said brake-band having a crescent-shaped extension engaged by said draft-element to vary automatically the moment of rotation of said brake-band about said drum. r

'8. In a snubber,abrake-drum and means to secure said drum non-rotatively in adjusted rotative position upon one of two spring-connected members of a vehicle; a flexible, resilient, split, friction-band surrounding the periphery of said drum and rotatable thereon; a snubbing cable connected with, and coiled about, said friction-band, and adapted to be connected with the other of said two spring-connected members of the vehicle; a coiled spring intermediate said brake-drum and friction-band and tending normally to cause rotation of said band relatively to said drum in a direction suitable to wind said cable upon said friction band; and means to vary the moment of rotation' of said friction-element about said drum, said means comprising a peripheral extension upon said friction-band, in position to be acted upon by said cable, the position of said extension relatively to the point of tangency between said cable and band being controllable by adjustment of said drum rotatively upon its support. b

9. In a snubber, a brake-drum having an axial bolt to connect said drum non-rotatively with one of two spring-connected members of a vehicle; a flexible, split, rotatable friction-band surrounding the periphery of said drum; a flexible draft-element connected with said friction-element and coiled .about the same and adapted to be connected with the other of said two springconnected members of the vehicle; a radial arm mounted to rotate about the axis of said drum, and having a portion extending into position to engage one end of said split band, and a spring coiled about said axis and connected with said drum and arm-m spectively, tending normally when wound up to rotate said arm and band to maintain tension on said cable, and means to vary the moment of rotation of said frictionelement about said drum.

In testimony whereof, I have signed this specification.

HARRY n. WEED.

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