US1269800A - Spring for road-vehicles. - Google Patents

Description

F. W. & E. D. EDWARDS. SPRING FOR ROAD VEHICLES. APPLICATION FILED NOV. 21. I916- 4 SHEETS-SHEET 74 KM w f N PakndedJunel8,19l8

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7% gm Wwmm, f y W mwmw F. W. 84 E. D. EDWARDS.

SPRING FOR ROAD VEHICLES. APPLICATION FILED NOV. 21, I916.

Patented June 18, 1918.

4 SHEETS-SHEET 2- F. W. & E. D. EDWARDS. SPRING FDR ROAD VEHICLES.

I APPLICATION FILED NOV. 2!. 1916- LDDD DDDD Patented J 11110 18, 1918.

4 SHEETS-SHEET 3.

F. W. (54 ETD. EDWARDS.

SPRING FOR ROAD VEHICLES.

APPLICATION FILED nov.2|, 1916.

4 SHEETS-SHEET 4" were it FREDERICK WILLIAM lBIllilVilrEfll)S AND ELLIOTT DERHAM EDIIARDS, OF SYDNEY, NEW

SOUTH 'IAIRES AUSTRALIA.

SPRING FOR ROAD-VEHICLES.

Specification of Letters Patent. Pmi igntgdl Jung 15, giggly,

Application filed November 21, 1916. Serial N0. 132,623.

To all whom it may concern.

Be it known that FREDERICK WinLiAM E1 wanes and ELLIOTT 1)]CR1IAM l lnwanns, subjects of the King of. Great Britain and lreland, residing, respectively, at 486 Kent street, Sydney, New South Wales, Austraha, and member of the Australian infantry forces on active service abroad, have invented new and useful Improvements in Springs for Road-Vehicles, of which the following is aspecification.

The object of this invention is to improve the springing of road vehicles, particularly -motor road vehicles, in which a rear platform spring is used in association with half elliptic side springs. It consists essentially in using in association with the rear side springs, two separate quarter elliptic platform springs having their butts mounted in bell cranked levers, and volute springs or similar-coiled cushion springs acting against the free arms of said levers. The invention includes certain accessory features partio uhulyrebouml springs associated with the platirom spring lc-vcrs. adjusting; devices for altering the bearing position of the cushion springs upon said free arms, cross pivoted shackle carriers for the forward ends of the side springs, and similar cross pivoted shackles for carrying the front side springs of the vehicle.

In the accon'ipanyinodrawings Figure l is a perspective view of portion of a rear end of a motor car chasis having a platform spring fitted thereto according to this invention;

Fig. 2 rear ole 'ation oi same;

Fig. 3 half plan and horizontal section about line (Ir-(L Fig. 2;

Fig. 4 perspective view of the cross pivotal of T shackle which carries the trout ends of the rear side springs;

Fig. 5 vertical section through the cross pivotal shackle. N

Fig. 6 side elevational view of pivotal slide shackle for rear ends 01'' front leaf springs Fig. 7 transverse sectional ele 'ation corresponding with Fig. 6; l

, .Fig. 8 side elevational view of a pivotal shackle for the front end of a front leaf spring.

Fig. 9 elevation-a1 view illustrating a variation in the details of construction shown in Figs. 1, :2 and 3.; and Fig. 10 perspective view corresponding with Fig. 9.

Fig. 11 is an elevational view illustrating a method oi subdividing the carrier springs which act on the crank levers which carry the butts of the quarter elliptic platform springs.

Fig. is a corresponding side elevation omitting the bell crank arms and the cushion springs.

We wish it to be understood that the quartcr elliptic platform springs may be bent to form lever tails which will serve the same purpose as the levers which carry the platform spring butts; also that the lever tails may be set. downward instead of upward as shown. inthe drawings, the necessary mechanial rearrangements being in that case made to enable the carrier springs to take care of the thrust of the lever tails. I

Referring to Figs. 1 to 3the platform bracket 1 projects rearwardly from the transverse rear member 2 of the car frame and is fixed thereon. To this bracket bolted a carrier in the ends of which oppositely arranged bell cranks l-6 are mounted on bolt pivots 3-3. The shorter arms 4: of these hell cranks are of box form and accommodate the butts 5 of the quarter elliptic platform springs, said spring butts being,- suitably secured therein by through bolts and spring clips. The free ends G 01" the. bell cranks are 'i'slotted or bored out, and accommodate slides 7 having lugs 8 formed upon them which projectthrough vertical slots 9. The sleeves 7 are tapped interiorly and are movable in the arms 6 by means of jacks screws 10 which may be operated by nut heads 11, 12 being a cap below which is a hxcd collar 13 which permits rotation of the'screwcd spindle 10 without allowing any vertical movement thereof through the cap 12. let is the carrier spring, preferably formed as a double volute with intermediate fioatingcollar disk 15. In a modification the disk 15 is mounted on the bracket 1 and forms an unyielding abutment for the two carrier springs l i, which then act independentlv. A wrist pin 16 is carried in each lug" 8. and a stem 17 integral with said pin is formed with. a shoulder 18 which form... 1

. abutment for one end of one of the carrier springs 14,. The wrist pin 16 is extended rearward and carries a T-sl'eeve 19 through which is freely slidable a rod 20. Rebound springs 21 are carried upon the outer ends i ofithe rod and are adjustable thereon for selves transversely so as to relieve the frame of twistingstresses due' to inequalities in road surface. When in consequence of the near rear. wheel passing over an obstacle, the 20 platform spring on the near side of the car is stressed, with the result that the arm 6 .on the bell crank which carries it is forced over toward the ofiside of the car, and this -movement is transmitted through the cush- 25 ion springs 14 to the bell crank on the offside of the car, causing a movement in that bell crank and consequently a downward movement in theleaf spring carried by it, tending to "lift the offside of the car, and thus operatin always so as to cause both sides of the frame to rise simultaneously.

; ile the two arms'G thus operate quite inependently but always so as to use the leaf .Springs as abutments one against the other,

"' both arms may act simultaneously, the freedom of their movement being determined by the constants of the sprin s 14 and the'adjustment of the sliders 7 t is obvious that f-with carrier springs 14 of certain constants, 40 the reactive effects will depend upon the position of the sliders"? determined by the adjustment of the screwed spindles 10. The vrebound movements which would tend to a throw the arms 6 apart are taken careof by the rebound-springs 21 which gradually take up-the shock of the rebound as the arms 6,

separate; said springs 21 ultimately limit ing the divergent movement'of the arms 6.

.When the abutment disk 15 is fixed the spring movement of one side of the car is not .transmitted through the platform springs to the other side of the car as when said abutment disk is floating.

It is not essential that the springs 14 should be of the volute type, but in practice that'type of spring will be found the most effective and convenient in this construction.

It will be clear also that the pivot bolts 3 may be carried directly by lugs on the trans- 60,v.erse rear frame member 2 instead of as shown by a member bolted thereto.

' 1A platform spring thus constructed serves all the purposes, of a shock absorber with the additional feature that it imposes diminished to tendency to transverse movement on the springs. formed with forked horns (31 wlnch carry on frame and body in response to relative transverse movement of the rear axle.

Facility foradjustment to vary the spring effect is also obtained, together with provisions for taking up rebound movements.

In the modified arrangement shown in Figs. 9 and 10 the two half platform springs operate independently on separate carrier In this case the bracket is pivot bolts 62 the cups 63 in which the volute springs 64 are seated. Through the center of each spring 64 and the cup (53 there passes a rod 65 fitted with a nut adjuster 66 on its outer. end to set the tension of the springs 64; the rear end of this rod is pivotally connected at 67 to the lever tail 68 of the stub carrier 69 in which the butts of the platform spring leaves 7 0 are mounted, said stub carrier being pivotally mounted at 71 between the horns (31. As already described, the tail 68 may be formed by continuing the spring leaves 70, bending them at the position occupied by the carrier 69 and securing them in a {clamp which is pivotally mounted at 71 be-.

tween the horns 61. V

In the modified arrangement shown in Fig. 11, the carrier spring is subdivided. A main buffer spring 88- supports a slider 81 working on a vertical guide 82, and this slider is pivotally connected through its two lugs 84 to the ends of the two cushion springs 85. The other ends of these springs set into caps 86 which are pivotally mounted on the ends 87 of the carrier levers. Minor movements of either platform spring is absorbed in the cushion spring 85 on which it acts, while any excessive movement closes its cushion spring 85 and then acts against the buffer spring 88, in which the rest of the original movement is absorbed. The closing movement of the buffer spring 88 however relievesihe abutment of the companion cushion spring. and so automatically allows the platform spring on the other side of the vehicle to rise. In this way. either platform. spring operates independently of the other in respect of minor movements of the axle, but'when the axle movement at either side ecomes substantial the interacting spring system operates in such a way as to cause both sides of the frame to move either upward or downward simultaneously. Whipping movements on the frame are thus substantially elii'ninated androlling movements of the vehicle body minimized.

In Fig. 4, 30 is a lug which is riveted to the chassis frame. 31 is a shackle having a cylindrical stem 32 which is rotatable in the. pivotal T piece 33 and is retained in itsbearing in said T piece by a back nut 34. 35 is the forward end of one of the rear main leaf springs.

The T piece 33 is mounted in the lug 30 by means of upper and lower screw pins 36 menace which are located against accidental With drawal by means of washer nut locks 37, having wings which are clipped over the lug of the carrier and up against one of the flats of the pin head. The cylindrical stem 32 permits rotation of the shackle 31 sufficiently to allow the spring 35 to operate withouttorsional distortion, the 'l' piece 33 being in effect a universal oint between the spring eye and the chassis.

A similar principle is applied in the case of the forward springs as shown in Figs.

6, 7 and 8. In Fig. 8, 40 is the shackle jaw,

41 cylindrical stem. thereof rotatable in a bearing formed in. dumb iron 42, and 43 is a baclc nut. The rear ends of the forward springs are carried by a slide shackle as, the stem 40 of which is cylindrical and is rotat able and slidable longitudinally in the car rier 47. 48 is a rebound spring on the back end of the stem 46, and 49 a back nut. The base of the carrier 47 may be secured to the chassis frame by means of bolts 50 fitted with spacing thimbles 51 inserted between the frame flanges.

Having now particularly described and ascertained the nature of. our said invention and in what manner the same is to be performed we declare that what we claim is 1. In a road vehicle springing system, the combination of two semi elliptic side springs mounted at their forward ends on the vehicle frame, two quarter elliptic pldtform springs shackled to the rear ends of said side springs, separate bell crank levers carrying the butts of said platform springs,

and coiled springs having an abutment on a frame bracket and acting on said bell crank ,levers. l

2. In a road vehicle springing system, the combination with half elliptic side springs, and quarter elliptic platform springs shackled thereto and mounted on separate bell crank levers of adjustable spring carriers through which platfoi'm spring movements are communicated to buffer springs located intern'rediate said bell crank levers.

3. In a road vehicle springing system, the coinbinatimi with half elliptic side springs, and cuartcr elliptic platform springs shackled thereto and mounted on separate bcll crank lovers, of rebound springs with limit checks adapted to check and limit the rebound movements of said platform springs.

4. In a road vehicle springing system, the combination with half elliptic side springs shackled to quarter elliptic platform springs, of independent bell cranks carrying the butts of said platform springs and pivotally mounted in frame brackets, carrier springs intern'iediate said bell crank levers which springs react against both said levers so as to cushion the leaf spring movements and communicate movements from the leaf springs on one side of the vehicle to the leaf springs on the other side thereof.

In a road vehicle springing system, the combination of half elliptic leaf springs at either side of the vehicle, quarter elliptic platform springs at the rear of the vehicle shackles to said half elliptic side springs, bell crank levers pivotally mounted on a frame member and carrying the butts of said quarter elliptic springs, and carrier springs acting on said bell crank levers and operating to procure in the quarter elliptic platform springs the equivalent movement of springs of substantially greater length than said platform springs.

6. In a road vehicle springing system, the combination of two semi elliptic side springs mounted at their forward ends on the vehicle frame, two quarter elliptic platform springs shackled to the rear end of said side springs, separate bell crank levers carrying the butts of said platform springs, coiled springs working against a frame bracket and acting on the bell crank levers, and shackled forks for the front ends of the side springs having cylindrical stems which are rotatably mounted in the brackets attached to the vehicle frame.

In testimony whereof we have signed our names to this specification in the presence 95 of two subscribing witnesses.

FREDERICK Wl LlilAlll EDWARDS. EliLlUT'l' Dllltll/llll EDWARDS.

Witnesses to signature of Frederick VVilliam Edwards:

W. I. DAVIS, ll. (I. (lanrnnm.

Witnesses to signature of Elliott Dcrham Edwards Knrrn Mnnninn, N. N. lFouons.

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