FLEXIBLE CLAMP

Abstract

The invention relates to a flexible clamp for securing a pin to a base yoke in an articulated joint connection, wherein the clamp comprises a body configured for mounting to the base yoke. The body of the clamp comprises at least one recess or aperture arranged in a vicinity of the pin contact part, which is shaped and sized to control deformation of the pin contact part of the clamp, when the clamp is secured to the base and engages the pin. The invention also relates to an articulated joint connection and a railway coupler comprising the clamp according the invention.

Claims

1.-11. (canceled)

12. A clamp for securing a pin to a base yoke in an articulated joint connection, the clamp comprising: a body configured to mount to the base yoke, wherein the body comprises: a pin contact part extending on one side of the body and configured to engage with the pin, at least one recess or aperture arranged in the body in a vicinity of the pin contact part, wherein the recess or aperture is configured to deform the body upon engagement with the pin, when the clamp is mounted to the base yoke.

13. The clamp according to claim 12, wherein the body of the clamp is defined by a top surface, a bottom surface, side surfaces extending between the top surface and the bottom surface, the side surfaces include a first side surface and a second side surface located on the opposite sides of the body of the clamp, the pin contact part extends across the bottom surface from the first side surface towards the second side surface, and the recess or the aperture is located above the pin contact part and extends across the body from the first side surface in the direction of the second side surface.

14. The clamp according to claim 13, wherein the body comprises the aperture that extends from the first side surface to the second side surface.

15. The clamp according to claim 12, wherein the pin contact part has a form of a concave surface constituting a segment of a side surface of a cylinder with a circular or elliptic base, or a segment of an ellipsoid surface.

16. The clamp according to claim 15, wherein the pin contact part has a form of a longitudinal cylinder segment.

17. The clamp according to claim 15, wherein the body is provided with one aperture that has an elongated kidney-shaped cross section, and the longer dimension of the cross section extends in the manner corresponding to the concave surface of the pin contact part.

18. The clamp according to claim 15, wherein a radius (r.sub.arc) of the segment of the side surface of the cylinder constituting the pin contact part of the clamp is greater than a radius (r.sub.pin) of the pin accommodated by the pin contact part of the clamp.

19. The clamp according to claim 18, wherein the radius (r.sub.arc) of the segment of the side surface of the cylinder constituting the pin contact part is greater than the radius (r.sub.pin) of the pin by 0.05 to 5.0 mm.

20. The clamp according to claim 12, further comprising securement holes extending across the body to receive screws for securing the clamp to the base yoke.

21. An articulated joint connection comprising: a clamp for securing a pin to a base yoke in an articulated joint connection, the clamp comprising: a body configured to mount to the base yoke, wherein the body comprises: a pin contact part extending on one side of the body and configured to engage with the pin, at least one recess or aperture arranged in the body in a vicinity of the pin contact part, wherein the recess or aperture is configured to deform the body upon engagement with the pin, when the clamp is mounted to the base yoke.

22. The articulated joint connection according to claim 21, wherein the body of the clamp is defined by a top surface, a bottom surface, side surfaces extending between the top surface and the bottom surface, the side surfaces include a first side surface and a second side surface located on the opposite sides of the body of the clamp, the pin contact part extends across the bottom surface from the first side surface towards the second side surface, and the recess or the aperture is located above the pin contact part and extends across the body from the first side surface in the direction of the second side surface.

23. The articulated joint connection according to claim 22, wherein the body comprises the aperture that extends from the first side surface to the second side surface.

24. The articulated joint connection according to claim 21, wherein the pin contact part has a form of a concave surface constituting a segment of a side surface of a cylinder with a circular or elliptic base, or a segment of an ellipsoid surface.

25. The articulated joint connection according to claim 24, wherein the body is provided with one aperture that has an elongated kidney-shaped cross section, and the longer dimension of the cross section extends in the manner corresponding to the concave surface of the pin contact part.

26. The articulated joint connection according to claim 24, wherein a radius (r.sub.arc) of the segment of the side surface of the cylinder constituting the pin contact part of the clamp is greater than a radius (r.sub.pin) of the pin accommodated by the pin contact part of the clamp.

27. The articulated joint connection according to claim 21, further comprising securement holes extending across the body to receive screws for securing the clamp to the base yoke.

28. A railway coupler comprising: a clamp for securing a pin to a base yoke in an articulated joint connection, the clamp comprising: a body configured to mount to the base yoke, wherein the body comprises: a pin contact part extending on one side of the body and configured to engage with the pin, at least one recess or aperture arranged in the body in a vicinity of the pin contact part, wherein the recess or aperture is configured to deform the body upon engagement with the pin, when the clamp is mounted to the base yoke.

29. The railway coupler according to claim 28, wherein the body of the clamp is defined by a top surface, a bottom surface, side surfaces extending between the top surface and the bottom surface, the side surfaces include a first side surface and a second side surface located on the opposite sides of the body of the clamp, the pin contact part extends across the bottom surface from the first side surface towards the second side surface, and the recess or the aperture is located above the pin contact part and extends across the body from the first side surface in the direction of the second side surface.

30. The railway coupler according to claim 29, wherein the body comprises the aperture that extends from the first side surface to the second side surface.

31. The railway coupler according to claim 28, wherein the pin contact part has a form of a concave surface constituting a segment of a side surface of a cylinder with a circular or elliptic base, or a segment of an ellipsoid surface.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0013] The subject of the invention was illustrated in a drawing, in which:

[0014] FIG. 1 shows a perspective view of the clamp according to the invention.

[0015] FIG. 2 shows a perspective view of the coupler comprising the clamp according to the invention.

[0016] FIG. 3A shows a front view of the coupler comprising the clamp according to the present invention, and

[0017] FIG. 3B presents an enlarged view of a part of the coupler (section B) comprising the clamp according to the present invention.

[0018] FIG. 1 presents a preferred embodiment of the flexible clamp of the invention for securing a pin 30 to a base yoke 221 in an articulated joint connection 20. The flexible clamp 10 comprises a T-shaped body 11 comprising a head part 12 and a shank part 13. The body 11 of the clamp 10 has a top surface 14 extending on the top of the head part 12 and a bottom surface 15 extending below the head part 12. The shank part 13 of the body 11 extends from the bottom surface 15 in a form of a protrusion. The side surfaces 16 defining the body 11 of the clamp 10 extend from the top surface 14 throughout the head part 12 and the shank part 13 of the body 11. The side surfaces 16 comprise a first side surface 161 and a second side surface 162 located on the opposite sides of the body 11, on the front and back of the T-shaped body 11, accordingly. These first 161 and second 162 side surfaces are parallel to each other and perpendicular to the top surface 14 of the body 11.

[0019] The body 11 of the clamp 10 is provided with a pin contact part 151 for engaging the pin 30, when the clamp 10 is secured to the base yoke 221. The pin contact part 151 has a form of a longitudinal cylinder segment (i.e. a cylindrical surface segment) extending across the shank part 13 in the direction from the first side surface 161 to the second side surface 162. In this manner the pin contact part 151 forms a concave surface (i.e. an arc), which corresponds to the cylindrical shape of the pin 30. The radius of the cylinder, a segment of which forms the pin contact part 151 of the clamp 10, is denoted in FIG. 3B as r.sub.arc. The said cylinder is substantially coaxial with the pin 30, which is in a form of a solid cylinder. The pin contact part 151 of the clamp 10 is configured to elastically deform or flex against the pin 30 as the clamp 10 is screwed down and secured to top flat ends of the base yoke 221 with screws 40.

[0020] The body 11 is provided with one aperture 17 located above the pin contact part 151, wherein said aperture 17 extends across the body 11 of the clamp 10 from the first side surface 161 to the second side surface 162. The aperture 17 has an elongated kidney-shaped cross section, wherein the longer dimension of the cross section extends in the manner corresponding to the concave surface cross section of the pin contact part 151 (i.e. in the direction across the shank part 13 of the body). This aperture 17 allows for elastic deformation of the clamp 10 when the clamp 10 is being secured to the base yoke 221 with the screws 40. This deformation ensures that the bottom surface 15 of the head part 12 of the body 11 adheres to the flat ends of the base yoke 221. This way the strain exerted on the screws 40 connecting the clamp 10 to the base yoke 221 is eliminated.

[0021] Finally, body 11 is also provided with two securement holes 18 for receiving screws 40 for securing the clamp 10 to the base yoke 221. The securement holes 18 extend across the head part 12 of the body 11 from the top surface 14 to the bottom surface 15. The screws 40, which lock the clamp 10 in place on the base yoke 221 are inserted in the securement holes 18.

[0022] FIGS. 2 and 3 present a coupler 20, in which the flexible clamp 10 of the invention is used to secure the pin 30 to the base yoke 221 of a coupler 20. As shown in FIGS. 2 and 3 the pin 30, which is in a form of a solid cylinder with the radius denoted as r.sub.pin, connects a joint between a first part 21 and a second part 22 of the coupler 20. The pin 30 is thread through an opening defined by walls of the first part 21 of the coupler 20. The first part 21 pivots axially around the pin 30. The pin 30 is secured to a curved section of a base yoke 221 of the second part 22 of the coupler 20. The pin 30 is secured to the curved sections of base yoke 221 by the clamp 10.

[0023] By providing the aperture 17 in the body 11, the clamp 10 undergoes elastic deformation while being secured to the base yoke 221 by the means of the screws 40. At the same time, the clamp material is not weakened by the presence of the aperture 17, so that the proper functioning of the clamp 10 is not affected in any way. As the clamp 10 is secured to top flat ends of the base yoke 221, the pin contact part 151 of the clamp 10 also elastically deforms or flexes against the pin 30 as the clamp 10. This deformation or flexure depends on a location, shape, and size of the aperture 17. Thus the aperture 17 is shaped and sized to control elastic deformation of the pin contact part 151 of clamp 10. Due to this deformation the bottom surface 15 of the clamp body adheres to the flat surface of the base yoke 221. That way no gap is formed between the bottom surface 15 of the clamp and the flat surface of the base yoke 221 and no strain is exerted on the screws 40, which secure the clamp 10 to the base yoke 221.

[0024] The pin contact part 151 of the clamp 10 flexes and works as a spring when the clamp 10 is screwed down and secured to top flat ends of the base yoke 221. To allow the pin contact part 151 to deform, the radius r.sub.acr of the cylinder, a segment of which forms the pin contact part 151, is greater than the radius r.sub.pin of the pin 30, wherein the difference in the radius length is in the range of 0.1 to 2 mm, as depicted by the following equation:

r.sub.arc=r.sub.pin+0.1to 2.0 mm

[0025] The flexible clamp of the invention when used to secure the pin 30 to the base yoke 221 reduces or eliminates fatigue stress on the screws 40 used to attach the clamp 10 to the base yoke 221. This is achieved by securing flush the flexible clamp 10 to top flat ends of the base yoke 221 with full contact between the top flat ends of the base yoke 221 and the bottom surface 15 of the clamp body 11.

REFERENCES

[0026] 10—clamp [0027] 11—body of the clamp [0028] 12—head part of the body [0029] 13—shank part of the body [0030] 14—top surface of the body [0031] 15—bottom surface of the body [0032] 151—pin contact part [0033] 16—side surfaces of the body [0034] 161—first side surface of the body [0035] 162—second side surface of the body [0036] 17—recess / aperture [0037] 18—securement hole [0038] 20—articulated joint connection / coupler [0039] 21—first part of the articulated joint connection / coupler [0040] 22—second part of the articulated joint connection I coupler [0041] 221—base yoke of the second part of the articulated joint connection / coupler [0042] 30—pin [0043] 40—screw