USRE17184E

USRE17184E - Shock absorber

Info

Publication number: USRE17184E
Authority: US
Priority date: 1924-11-20
Publication date: 1929-01-01
Also published as: US1554249A

Description

Jan. 1, 1929.

Re. 17,184 1 E. R. WOLF SHOCK ABSORBER Original Filed Nov. 20, 1

IN VEN TOR A TTORN E Y5 ,Reissued J55. 1;1929.

PATENT oFFlc-E.

' EDWARD It. wont, OF MIAMI, FLORIDA.

snocx ABsoRBER;

Original No. 1,554,249, dated. September 22,1925, Serial 11 0, 751,165, filed Novembef 20, 1924. Application for reissue filed June 6, 1927. SeriaLNo. 196,978.

This invent-ion relates to shock absorbers and" more particularly to shock absorbers 6r the hydraulic type for use on automobiles. 4 Difficulty has heretofore been experienced in shock absorbers of thistype since it is not always possible to completely fill the cylin-' ders of the same with liquid. This results from the'fact that the piston rod extends into the cylinder in varying amounts depending on the force of the shock to be absorbed, and a space must be left in the cylinder equal to the maximum displacement of the rod. The fact i that the cylinder is not completely filled with liquids'results in a noticeable jar .at the in- 5 stant that the device starts to absorb a shock. Diflicult has also been experiencedv in mounting ydraulic shock absorbers on auto mobiles in such a manneras to provide for the side sway of the body'relative to the supporting axles. Y An object of the present invention is to overcome the above defects by providing an improved hydraulic shock absorber which is so constructed that the cylinder may be completely filled with liquid, and which is so mounted that the side sway of the body will in no way affect the proper functioning of the device.

Another object of this invention is to 'pro vide novel means for permitting substantially free flow of the liquid past the same in the cylinder when the automobile body and axle have relative movement towards each other,

and to resist flow of the liquid past the same when said body and axle ha ve relative movement away from each other.

Another object of the invention is to provide novel motion-transmitting meansfor the device which is so constructed that the cylin der normally assumesa horizontal position, thereby'd'ecreasing the space required for its installation. V

V Other objects of the invention are to provide. a device which is inexpensive to manufacture, simple and rugged in construction and one which may be readily applied to auto mobiles now in use. r

lhe invention is capable of receiving a variety of mechanical expressions, some of which are shown on the accompanyingdrawings, but it is to be expressly understood that the drawings are forpurposes of illustration only and are not to beconstrued as'a definition 9 to move in a'vertial plane.

of the limits of the invention, reference bemg had to the appended claims for that purose.

In the drawings Fig. 1 is a side elevation illustrating'one embodiment of the inventive idea; Flg. 2 is a longitudinal sectional view, somewhat enlarged, of the cylinder and fluid controlling means;

Figs. 3 and 4 aresectional views taken on tlhe lindes 3-3 and 4+4, respectively, of Fig.

Fig. 5 is an enlarged detail view, in section, illustrating a second type of means for.controlling theflow of liquid in the cylinder.

I Referring to the drawings, wherein like reference numerals refer to like parts throughout the several views, 6 is an axle and 7 a portion of anautomobile body, the latter being mounted on the axle in any suitable manner known in the art, as by means of springs .(not shown). Secured to the body portion 7 at a suitable point is a supporting members for a liquid containing cylinder 9. Preferably, member 8 is provided with an inwardly extending spindle or pivot portion 8' which freely turns in, andis supported by, the body portion 7. A bracket 10 of any suitable type may be secured to the inner surface of portion 7, as by means of rivets 11, to. provide a bearing surface for spindle 8 and to strengthen the body at the point where'the 85 spindlepasses through the same. Retaining means, such as nut 12, is preferably employed for securing member 8 in posit-ion. If desired, the member 8 may be formed in two parts, the outer portion or strap 8" surround- 90 ing the outer half of the cylinder 9 and being secured to the inner portion by means pt bolts 13. Such a mounting permits cylinder In the form shown, the c linder comprises a tubular portion 14"threa ed at its op site ends to receive cylinder heads 15. A i illing plug 16 may be threaded or otherwise removably secured in one of the cylinder heads to permit the cylinder to be filled with liquid. Each of the cylinder heads is rovided with packing 17 and a suitable glan nut 18, which latter surrounds piston rod 19. As shown in Fig. 2, the rod 19 extends through the opposite ends of the cylinder and may be formed in two

sections

19 and 19 to facilitate assembly of the parts.

The inner end of the section 19 is exteriorly threaded as at 20,'to receive a .21, while the inner periphe -with a. plurality valve cage 21 which may-be retained in position by means of the cage 21 has an tially less than the inder, and is provided with threaded to receive a flanged of openings 24;.

through a central opening in disc 23 is the V the surface over which the ably of reduced This reduced portion. is exteriorly threaded disc valve 26 spring 27 rod 19 and the section 19 of the piston rod which is preferdiameter at its inner end.

and extends into a cup 25 formed in the inner end of rod section 19*. Slid-ably mounted on rod section 19 and within the cage'21, is a which is normally maintained position on disc 23 by means of a surrounding section 19 and interposed between said valve and the cage 21.

Suitable means are provided for o ratively connecting the rod 19 to the axle whereby relative movement of the body portion 7 and axle 6 is transmitted to said rod but side sway of the body will not prevent the proper functioning of the device. As shown, this means comprises a bell crank lever 28 which is connected at its central portion by in seated suitable universal joint means 29 to the axle.

6. The vertical arm 28 of the bell crank lever is pivotally connected in any suitable manner to one end of rod 19 while the horizontal arm 28 of said lever is pivotally connected by universal joint means 30 to a vertical link 31. The upper end of the latter is preferably pivotally connected to the cylindrical stem 8' of supporting member 8 between body portion 7 and the cylinder 9.

0pemtion.When the irregularities of vehicle is moving cause relative movement of the body portion 7 toward axle 6, arm 28" is forced-downwardly by link- 31, the lever 28 swinging about the is forced to the joint means 29. 'Arm 28 right, as viewed in Fig. 1, carrying with it piston elements, and the left hand end of cylinder 9 is simultaneously swung upwardly about spindle 8'. The pressure of the liquid on the valve disc 26 moves the latter to the left, compressing the spring 2 uncovering ports 24 and 21', and permitting free passage of the piston elements through the liquid. On the rebound, when the body and axle have relative movement away from each other, the valve 26 is forced the cylinder 9.

onto its seat and the piston elements and rod 19 move back slowly to normal position as the liquid flows through the annular space between the-valve cage 21 and the walls of I Since the piston rod 19 at all times extends through the opposite ends of the cylinder, regardless of the position of the piston-elements the displacement of the piston rod is at out its length and at suitable times the same, and the cylinder' may be completely filled with liquid. The sectional construction of'rod 19 greatly facilitates the assembly of the parts.

Fig. 5 illustrates another manner in which the piston elements may formed. As shown, the piston rod 32 is integral throughpoints is provided withopenings to receive a pair of pins 33 which extend through the rod to serve as retainingelementsfor a disc 34 which sur-' rounds rod 32 and which is provided with a suitable number of openings 35. Slidably mounted on rod 32 is a second disc 36 having an outer diameter that is much smaller than the inner diameter of the cylinder. A pin 37 extending through rod 32 serves as a stop to limit the movement of disc 36 away from the ported disc 34. Since the

discs

34 and 36 are symmetrically formed and the pressure on the faces thereof is the same at all points, there is no tendency for the discs to .cant and bind in the cylinder. Movement of rod 32 in one direction results in disc 36 being moved to a position ad acent pin 37, uncovering ports 35, thereby permitting the piston Movement of rod 32 in the opposite or rebound direction,

results in disc 36 being moved'to cover the ports 35, whereby move of the invention. Reference is therefore to be had to the claims hereto appended for a definition of the limits of the invention.

What I claim is 1. Ahydraulic shock absorber comprising in combination with a body and a supporting axle, a cylinder carried by said body, a piston in said cylinder, a-rod for said piston extending through the opposite ends of the cylinder, a bell crank lever fulcrumed at its elbow on said axle, means pivotally connecting one arm of said lever to said rod, and a member .piyoted to said body .and the other arm of sald lever. 1

2. A device of the class described comprising in combination with an automobile ody and a supporting axle, a liquid containing cylinder pivotally secured to said body for pivotal movement in a vertical plane, a piston in said cylinder, a rod secured to the piston and having its opposite ends extending through theends of the cylinder, a bell crank lever, universal oint means connecting said lever to said axle, means for pivotally connecting the lever to ally connected to said body, and universal joint means connecting said member and lever.

3. A device of the class described compris- .elcments to move freely through the liquid. I

said rod, a member pivotsaid axle, means connecting one arm of the lever; to said rod, and a member pivotally connected. to the other arm of said lever and \said body. Y

4. A device of the class described comprising, in combination with an automobile body and a. supporting axle, a liquid-containing cylinder mounted on'said body to turn in a vertical plane relative to said body, a rod extending through the opposite ends of said cylinder and slidable therein, a piston carried by the rod, a bell-crank'l'e'ver fulcrumed at its elbow on said axle, a pivotal connection between one arm of said lever and said piston rod, and a link pivotally connected to the 1 body at one end and to the other arm'i'of said lever at its opposite'endi' 5. A device of the class described comprising in combination with an automobile body and a supporting axle, a. liquid-containing cylinder, a member pivotally connecting said cylinder to said body, a piston rod for said cylinder,'a piston secured to therod and slidable in said cylinder, :1 bell crank lever connected to said axle for universal move ment, means pivotally connecting one arm of said lever to said rod, a connecting element ,1 pivotally connected to said member, and universaljoint'means connecting said element to the other arm of said lever.

6. A device of the class described, comprising in combination with a body and-a supporting member therefor, a cylinder pivotally connected to said body, a rod extending through the opposite ends of the cylinder,

fluid-controlling means carried by the rodv within said cylinder, said means consisting of a fiat disc having a centeiopening through which said rod passes and having ports passing therethrough, pins passing through the said rod one on either side of said disc, a member slidable on the rod to cover the ports in said disc, and means for limiting the move ment of said slidable member,

7. In a shock absorber, in combination.

with a body and a supporting member thereforfa cylinder designed to be completely filled with liquid, a rod extending through the opposite ends of said cylinder, means 'opera tively connecting said cylinder J and rodwith said body and support, said means including connections permittingfielative movement about angularly related axes and fluid controlling means carried by said rod within'said cylinder, said fluid-controlling means comprising a piston mounted on said 'rod and having a relatively large ported area to permit relatively free flow of liquid therethrough, and means moved by the pressure of the liquid to completely open the ported area or to close the same in order to permit said piston to move relatively freely in one direc-' tion and with checked movement in the opposite direction.

8. In a shock absorber, in combination. with a body and a supporting member therefor, a cylinder designed to be completely filled with liquid, a rod extending through the opposite ends of said cylinder, means operatively connecting said cylinder and rod with said body and support, said means including connections permitting relative movement about axest disposed at right angles and fluid'oontrolling means carried by-said rod within said cylinder, said fluid controlling means comprising .a piston mounted on said rod and having a relatively large-ported areato permit relatively free flow of liquid therethrough, a i member movable on said rod by the pressure of said liquid to completely open the ported area or to close the same in order to permit said piston to move relatively freely in one direction and with checked movement in the opposite direction, and means on said rod to limit the opening movement of said member. 9.- In a shock absorber, in combination with a body and a supporting member therefor, a

liquid-containing cylinder, a rod extending through the opposite ends of said cylinder, means operatively connecting said cylinder and rod with said body and support, said means including connections permitting rel ative movement about angularly related axes, and fluid controlling means within said cylinder,said fluid controlling means comprising a piston mounted on said'rod and provided with a relatively large ported area which occupies a sufficient portion of the area of the piston btween its periphery and said rod to through, and means moved by the pressure of the liquid to completely open the ported area or to close the same in order to permit saidi' piston to move relatively freely in one direction and with checked movement in the opposite direction. v

10. .In a 'shock absorber, inycombination with a body and a supporting member therefor, a cylinder designed to be completely filled with liquid, a rod extending through the opposite ends offsaid cylinder, means' operativel connecting said cylinder and rod with said% cludingconnections permitting relative movement about angularly related axes and fluid controlling means carried by said rod within said cylinder, said fluid controlling means comprising a piston mounted on said rod and having arelatively large ported area to perody and support, said means in- 110 permit relatively free flow of the liquid therey mit relatively free. flow of liquid there through, said piston providing a clearance therebetween and said cylinder, and means moved by the pressure of said liquid to completely open the ported area or to close the 11. In a shock absorber, in combination with a body and a supportingmembertherefor, a cylinder designed to becompletely filled with liquid, a rod extending through the 0p-.

posite ends of said cylinder, means operative- 1y connecting'said cylinder and rod withsaid body and support, said meansjnelndingeonnections permitting universal relative move-- mentand vfluid controlling means carried by said rod within said cylinder, said fluid controlling means comprising a piston mounted on said rod and having a relatively large portedarea to permit relatively free flow of liquid therethrough, said piston providing a clearance therebetween and said cylinder, a disc movable on said rod by thepressure of said liquid to completely open the ported area or to close the same in order'to permit opposite direction,- and means on said rod to limit the opening movement of said disc.

In testimony whereof I have signed this specification. v

EDWARD B. WOLF.

' said piston to move relatively freely in the