Step assembly and walkway for a screed

Patent metadata

Field	Value
Publication number	US-11293148-B2
Application number	US-201916291573-A
Country	US
Kind code	B2
Filing date	Mar 4, 2019
Priority date	Mar 4, 2019
Publication date	Apr 5, 2022
Grant date	Apr 5, 2022

Abstract

A step assembly may include a first step support member and a second step support member to be connected to a screed frame, and a step frame movably connected to the first step support member and the second step support member. The step frame may be movably connected to the first step support member by a first pin engaged with the first step support member and a slot of the step frame. The step frame may be movably connected to the second step support member by a second pin engaged with the second step support member and an aperture of the step frame. The step frame may be biased to a position relative the first step support member and the second step support member by a first biasing member and a second biasing member.

First claim

What is claimed is:

1. A screed assembly, comprising:
a screed frame;
a first step support member connected to the screed frame;
a second step support member connected to the screed frame; and
a step frame including a step, the step frame movably connected to the first step support member and the second step support member,
the step frame movably connected to the first step support member by a first pin engaged with the first step support member and a slot of the step frame,
the step frame movably connected to the second step support member by a second pin engaged with the second step support member and an aperture of the step frame,
the step frame being biased to a position relative the first step support member and the second step support member by a first biasing member disposed between the step frame and the first step support member and a second biasing member disposed between the step frame and the second step support member,
the first pin being disposed in the first biasing member, and
the second pin being disposed in the second biasing member.

2. The screed assembly of claim 1 , wherein the first biasing member is a first coil spring and the second biasing member is a second coil spring.

3. The screed assembly of claim 1 , further comprising:
a walkway member connected to the screed frame, the walkway member being pivotal between a standing position and a stowed position.

4. The screed assembly of claim 3 , wherein the step frame includes a walkway projection that extends from the step frame, and
wherein the walkway member includes a catch that surrounds a distal portion of the walkway projection in the standing position of the walkway member.

5. The screed assembly of claim 1 , wherein a platform cover extends from the first step support member to the second step support member, and
wherein the platform cover is pivotally connected to the first step support member or the second step support member.

6. The screed assembly of claim 1 , wherein the screed frame includes a first lateral portion and a second lateral portion that are independently movable about a central line of the screed frame, and
wherein the first step support member is connected to the first lateral portion of the screed frame and the second step support member is connected to the second lateral portion of the screed frame.

7. The screed assembly of claim 1 , wherein the step frame includes a first well and a second well,
wherein a first end portion of the first step support member is disposed in the first well and a second end portion of the second step support member is disposed in the second well, and
wherein the first biasing member is disposed between the first end portion of the first step support member and a first inward wall of the first well, and the second biasing member is disposed between the second end portion of the second step support member and a second inward wall of the second well.

8. The screed assembly of claim 1 , wherein the slot of the step frame is slidably engaged with the first pin and the aperture of the step frame is pivotally engaged with the second pin.

9. The screed assembly of claim 1 , wherein the step is provided in an orientation that permits standing on the step by a user, and
wherein the step is maintained in the orientation during one or more of:
a positive crowning movement of the screed frame,
a negative crowning movement of the screed frame, or
a cross-sloping movement of the screed frame.

10. The screed assembly of claim 1 ,
wherein, when the step frame is displaced from the position during a cross-sloping movement of the screed frame, at least one of the first biasing member or the second biasing member is in a compressed state.

11. The screed assembly of claim 1 ,
wherein the step is connected to the step frame by a rod engaged with the step.

12. A screed assembly, comprising:
a screed frame;
a step frame that includes a step and a walkway projection extending from the step frame; and
a walkway member connected to the screed frame, the walkway member being pivotal between a standing position and a stowed position,
the walkway member including a catch that surrounds a distal portion of the walkway projection in the standing position, and one or more bumper members proximate the distal portion of the walkway projection in the standing position or the stowed position.

13. The screed assembly of claim 12 , wherein the walkway member is in a horizontal orientation in the standing position.

14. The screed assembly of claim 12 , wherein the screed frame includes a first lateral portion and a second lateral portion that are independently movable about a central line of the screed frame,
wherein the walkway member is connected to the screed frame at a first connection interface with the first lateral portion and a second connection interface with the second lateral portion, and
wherein the walkway member is pivotal between the standing position and the stowed position with respect to an axis defined by the first connection interface and the second connection interface.

15. The screed assembly of claim 12 , wherein a bumper member of the one or more bumper members is to contact the walkway projection during one or more of:
a positive crowning movement of the screed frame,
a negative crowning movement of the screed frame,
a vertical movement of the screed frame,
a sloping movement of the screed frame, or
a cross-sloping movement of the screed frame.

16. The screed assembly of claim 12 , wherein the distal portion of the walkway projection includes a bumper projection orthogonal to the walkway projection, and
wherein the one or more bumper members are proximate the bumper projection.

17. A step assembly, comprising:
a first step support member to be connected to a screed frame;
a second step support member to be connected to the screed frame; and
a step frame including a step,
the step frame being movably connected to the first step support member and the second step support member,
the step frame being movably connected to the first step support member by a first pin engaged with the first step support member and a slot of the step frame,
the step frame being movably connected to the second step support member by a second pin engaged with the second step support member and an aperture of the step frame,
the step frame being biased to a position relative the first step support member and the second step support member by a first biasing member disposed between the step frame and the first step support member and a second biasing member disposed between the step frame and the second step support member,

the step frame including a well,
a first end portion of the first step support member being disposed in the well,
the first biasing member being disposed in the well,
the first pin being disposed in the first biasing member, and
the second pin being disposed in the second biasing member.

18. The step assembly of claim 17 ,
wherein the well is a first well,
wherein the step frame further includes a second well,
wherein a second end portion of the second step support member is disposed in the second well,
wherein the first biasing member is disposed between the first end portion of the first step support member and a first inward wall of the first well, and
wherein the second biasing member is disposed between the second end portion of the second step support member and a second inward wall of the second well.

19. The step assembly of claim 17

Assignees

• Caterpillar Paving Products Inc

Inventors

• Repiscak Monica
• Jorgensen John E

Classifications

• E01C2301/40

  Working platform or walkway · CPC title

• E01C19/4853 Primary

  Apparatus designed for railless operation, e.g. crawler-mounted, provided with portable trackway arrangements · CPC title

• E01C2301/16

  Laterally slidable screeds · CPC title

• E01C19/4866

  with solely non-vibratory or non-percussive pressing or smoothing means for consolidating or finishing (E01C19/4886 takes precedence; combined with rollers E01C19/488) · CPC title

• E01C19/48 Primary

  for laying-down the materials and consolidating them, or finishing the surface {, e.g. slip forms therefor, forming kerbs or gutters in a continuous operation in situ (E01C19/002, E01C23/065 take precedence; devices for guiding or controlling the machines along a predetermined path E01C19/004)} · CPC title