US2734741A

US2734741A - blattner

Info

Publication number: US2734741A
Authority: US
Publication date: 1956-02-14
Anticipated expiration: 1973-02-14

Description

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2 Sheets-Sheet 1 Filed March 3l 1950 2 G. I F

Inve nto r: 4 Emil' H. Bla'rtner his 'rtorney Feb. 14, 1956 E. H. BLATTNER SNUBBING MECHANISM 2 Sheets-Sheet 2 Filed March 51. 1950 FIG. 5

FlG. 4

Inventor: l Emil H. Bla'fner his Attorney' The top spring plate has, at its central area, an opening 23 extending entirely therethrough and this opening is defined by horizontally spaced legs or end walls 24 normally and desirably positioned or disposed in vertical alignment with the subjacent or lower spaced shoes. Joining related extremities of the legs is a pair of parallel connecting walls 2S with these walls being suitably reinforced by triangular gussets 26. The end and connecting walls downstand from the top plate into the contines of the spring unit or snubbing mechanism but, however, terminate short of the bottom plate walls for the purpose to be hereinafter made apparent. Each leg is also provided with a knob or protuberance 27 which extends inwardly of the device so that these top cap protuberances also extend toward one another and in substantial vertical alignment with the shoe protuberances.

As will be appreciated the lower or bottom spring plate remains stationary with respect to the side frame or spring plank and the top spring plate or cap is arranged, during the flexing action of the coil springs, to move vertically toward or away from the lower spring plate. Accordingly, in order to reflect a vertical movement of the top spring plate in the shoes to create the necessary or required frictional forces, there is incorporated in the device a pair of connecting links or arms 28. Each link is spaced horizontally from a companion or related link and extends vertically so as to join vertically aligned or related protuberances and since the links are rigid or stiff components, any vertical movement of the top spring plate will cause the shoes to execute a like or corresponding vertical movement.

It has been found in practice that a bolster besides moving vertically relative to a side frame or spring plank also is caused to move horizontally in all directions, at least for the value of the clearances allowed between interlocking parts of the side frame and bolster. lf structure is not incorporated in the device to compensate for this referred to horizontal movement, then the components of the device will be subjected to stresses for which they may have not been designed to withstand. Also the relative movable parts of the device may not, and in all probability will not function as intended. Accordingly, the protuherances of the shoes are formed circular or convex and as such present ball or spherical surfaces 29 and these shoe surfaces nest in ball or spherical concave surfaces 39 formed in the lower extremities of the links. This relation or association of ball and socket surfaces not only forms a positive and denite interlock between the shoes and links but also affords universal movements between these components. Each top plate knob 27 is also formed as a convex or spherical ball shaped surface 31 so as to nest with a concave, spherical, socket shaped surface 32 in a related extremity of a link and a universal movement may be also freely executed by this connection. With this construction, therefore, any vertical movement of the top plate will result in a vertical movement of the shoes and any horizontal movement of the top plate will not disturb the prearranged relationship of the surfaces 19 and 21.

In order to exert the required pressure against the links, the latter are provided with horizontally aligned upper and lower studs 33 and 33a respectively with these studs desirably positioned on the vertical center line of the links. An upper coil or helicalspring 34 has a horizontal axis extending between the upper limits of the links to be in overlapping relation with the upper studs thus keeping the upper coil spring in position and maintaining constant contact between ball and socket surfaces 31 and 32. Disposed parallel with the upper coil spring is a lower coil spring 35 which, at its ends telescopes the lower studs to thereby be held in a predetermined position. The lower coil spring being compressed between the lower extremities of the links not only maintains a contact of the ball and

socket surfaces

29 and 30 but also exerts suflicient pressure to cause the required amount of frictional forces to be created on the shoe rubbing faces and the housing brushing faces for snubbing or controlling the vibrations of the all coil springs.

It may at times be thought necessary to limit the movement of the shoes relative to the levers. If such is deemed necessary each link may be provided with a post or shaft 36 centrally disposed between the link sockets and extending in a direction away from the link toward a related or companion housing bearing wall. This construction necessarily infringes on the shoe area by extending into the confines of the shoes. Accordingly each shoe has, formed therein, a U-shaped opening or slot 37 and as will be noted by referring particularly to Figures 3 and 4 of the drawings, each post extends freely into a related or adjacent slot with suicient clearance thereabout to permit or allow a required universal movement between the links and shoes.

For the purpose of assembly of the unit each post, at its free extremity, has a shallow well 38 formed therein so that during assembly, a proper tool (not shown) may be seated in the wells and the links be moved toward one another until the upper and lower coil springs are solid. This compressing of these springs will permit the insertion of the shoe-link-spring assembly within the lower spring plate casing and allow the top spring cap or plate to be lowered until the ball surfaces 31 are aligned with the sockets 32 at which time the tool may then be manipulated so that all the components of the device may assume normal positions as illustrated in the drawings.

From the above it will be noted that various changes and alterations may be made to the illustrated and described construction without departing from the spirit of this invention or scope of the appended claims. f

I claim:

l. In a spring group for a railway car truck, the cornbination of, top and bottom spring plates, a group of coil springs between said plates, a housing upstanding from said bottom plate and presenting oppositely disposed walls, friction shoes within said housing and arranged to contact said walls, said shoes having convex surfaces, convex surfaces on said top plate above said shoe convex surfaces, connecting means extending between each top plate convex surface and related shoe convex surface and provided with concave surfaces accommodating said convex surfaces, and spring means urging said connecting means into contact with said top plate and shoes for maintaining the connection therebetween.

2. In a railway truck spring unit with a built-in snubber, the combination of, ltop and bottom spring plates, coil springs between said plates, horizontally spaced walls upstanding from said bottom plate, horizontally spaced shoes bearing against said walls, horizontally spaced means downstanding from said top plate, said last named means being spaced inwardly of said unit from the horizontal limits of said walls, a link connecting each downstanding means and related shoe and arranged to pivot relative thereto, and horizontal spring means between said links for urging the latter apart.

3. ln a railway truck spring unit with a built-in snubber, the combination of, top and bottom spring plates, a group of coil springs between said plates, horizontally spaced vertically extending walls upstanding from said bottom plate, horizontally spaced shoes arranged to frictionally contact said walls, horizontally spaced legs downstanding from said top plate in substantial vertical alignment with said shoes, means connecting each leg and related shoe and arranged for angular movement therebetween, and spring means between said connecting means for urging said connecting means apart.

4. ln a railway truck spring unit with a lbuilt-in snubber, the combination of, top and bottom spring plates, a group of coil springs between said plates, a housing presenting horizontally spaced walls upstanding fromk said bottom plate, horizontally spaced shoes arranged to frictionally engage said walls, horizontally spaced legs formed on said top plate and projecting toward said shoes in substantial Vertical alignment therewith, horizontally spaced vertically extending links joining and universally mounted on said legs and shoes, and spring means between said links for urging the latter apart.

5. In a railway truck spring unit with a built-in snubber, the combination of, top and bottom spring plates arranged for relative vertical and horizontal movement, a housing upstanding from said bottom plate and presenting vertically disposed horizontally spaced walls, shoes horizontally spaced and arranged to frictionally engage said walls, horizontally spaced legs downstanding from said top plate in substantial vertical alignment with said shoes, link means horizontally spaced and connecting aligned legs and shoes, an articulated joint between each shoe and related link means, and spring means urging said link means into contact with said legs and shoes and said shoes into frictional engagement with said walls.

6. In a railway truck spring unit with a built-in snubber,v the combination of, top and bottom spring plates arranged for relative vertical and horizontal movement,

a housing upstanding from said bottom plate and presenting vertically disposed horizontally spaced walls, shoes horizontally spaced and arranged to frictionally engage said walls, horizontally spaced legs downstanding from said top plate in substantially vertical alignment with said shoes, link means horizontally spaced and connecting aligned legs and shoes, said link means being arranged for articulate movement relative to said legs,

and shoes, and spring means urging said link means into contact with said legs and shoes and said shoes into frictional engagement with said walls.

7. In a railway truck spring unit with a built-in snubber, the combination of, top and bottom spring plates arranged for relative vertical and horizontal movement, a housing upstanding from said bottom plate and presenting vertically disposed horizontally spaced walls, shoes horizontally spaced and arranged to frictionally engage said walls, horizontally spaced legs downstanding from said top plate in substantial vertical alignment with said shoes, link means horizontally spaced and connecting aligned legs and shoes, said link means being arranged for articulate movement relative to said legs and shoes, means on said link means extending into said shoes for limiting articulated movement therebetween, and spring means between said link means for urging the latter into engagement with said legs and shoes.

8. In a railway truck spring unit with a built-in snubber, the combination of, top and bottom spring plates arranged for relative vertical and horizontal movement, a housing upstanding from said bottom plate and presenting vertically disposed horizontally spaced walls, shoes horizontally spaced and arranged to frictionally engage said walls, horizontally spaced legs downstanding from said top plate in substantially vertical alignment with said shoes, horizontally spaced links connecting said legs and shoes for moving the latter vertically in response to a vertical movement of said top plate, said links being arranged for articulate movement relative to said legsand shoes, and spring means between said links for urging the latter against said lugs and shoes.

9. In a railway truck spring unit with a built-in snubber, the combination of, top and bottom spring plates arranged for relative vertical and horizontal movement, a housing upstanding from said bottom plate and presenting vertically disposed horizontally spaced walls, shoes horizontally spaced and arranged to frictionally engage said walls, horizontally spaced legs downstanding from said top plate in substantial vertical alignment with said shoes, horizontally spaced vertically extending links connecting said legs and shoes for moving the latter vertically in response to a vertical movement of said top plate, an articulate joint between each link and associated shoe, means on said links and shoes for limiting articulate movement therebetween, and spring means acting horizontally between said links for urging the latter into contact with said legs and shoes,

10. In a spring cap for use in a spring unit, a plate having spring seats spaced about said cap on one side of said plate, horizontally spaced legs extending from said plate from a side thereof including said spring seats, and partly spherical surfaces on said legs, said spherical surfaces being arranged to face one nother in horizontally aligned spaced relation.

ll. In a railway truck spring unit with built-in snubber, the combination of top and bottom spring plates, a group of coil springs acting between said plates, a housing upstanding from said bottom plate and presenting oppositely disposed walls, horizontally spaced friction shoes between and bearing against said walls, horizontally spaced connecting means movably connected to and joining each of said shoes and top plate, and spring means between said connecting means for urging said connecting means apart.

l2. In a railway truck spring unit with built-in snubber, the combination of top and bottom spring plates, a group of coil springs acting between said plates, a housing upstanding from said bottom plate and presenting oppositely disposed walls, horizontally spaced friction shoes bearing against said walls, horizontally spaced connecting means movably connected to and connecting each of said shoes and said top plate, and a horizontally acting spring urging said' connecting means apart and said shoes into frictional contact with said walls.

13. In a railway spring unit with built-in snubber and having top and bottom spring plates and a group of coil springs acting therebetween, the combination of a housing upstanding from said bottom plate, a shoe member frictionally engageable with said housing, a member downstanding from said top plate and spaced from said shoe member, connecting means extending between said members, said connecting means being angleably connectable to each of said members through intertting surfaces on said members and means by lateral displacement of said means relative to said members, and spring means acting on said connecting means and urging said surfaces into contact for maintaining the t connection between said means and each of said members.

References Cited inthe tile of this patent UNITED STATES PATENTS 207,020 Dick et al Aug. 13, 1878 882,279 Washburn Mar. 17, 1908 1,398,692 Haseltine Nov. 29, 1921 2,091,783 Lazna Aug. 31, 1937 2,356,742 Bachman Aug. 29, 1944 2,379,626 Cottrell July 3, 1945 2,398,750 Light Apr. 16, 1946 2,439,484 Miner Apr. 13, 1948 2,481,030 Link Sept. 6, 1949 2,483,375 Tack Sept. 27, 1949 FOREIGN PATENTS 242,073 Great Britain Nov. 5, 19.25