Structure for a robotic end effector

Patent metadata

Field	Value
Publication number	US-10668629-B2
Application number	US-201815967210-A
Country	US
Kind code	B2
Filing date	Apr 30, 2018
Priority date	May 1, 2017
Publication date	Jun 2, 2020
Grant date	Jun 2, 2020

Abstract

Various stabilization devices for a robotic end of arm tool, such as a robotic gripper, are described. The stabilization device is provided in a palm area of the end of arm tool and serves as a backstop against which actuators of the end of arm tool can push a compliant or slick target object. The stabilization device may take many any of a variety of shapes, depending on the application. Based on the shape of the stabilization device and the action of the robotic gripper on the target object, the target object can be moved or rotated in a more stable configuration, thus allowing the actuators to apply less force while still maintaining a firm grasp of the object.

First claim

The invention claimed is:

1. A stabilization device for a robotic end effector comprising first and second robotic actuators capable of moving between an undeployed state and a deployed state by curving along a central axis of rotation, respective distal ends of the first and second robotic actuators being brought into proximity with a palm region of an end effector base when the first and second robotic actuators are in the deployed state, wherein:
the first robotic actuator has a first actuator base on a radially interior side of the first robotic actuator and the second robotic actuator has a second actuator base on a radially interior side of the second robotic actuator,
the first robotic actuator and the second robotic actuator base are deployed on the robotic end effector so that the first actuator base and the second actuator base are parallel to each other and in a facing configuration when the first robotic actuator and the second robotic actuator are in the undeployed state, and
the palm region comprises a space on the end effector base between the first robotic actuator and the second robotic actuator,
the stabilization device comprising:
a stabilization device base sized and shaped to fit in the palm region of the robotic end effector; and

at least one ridge extending away from the stabilization device base by a height, the ridge having a length extending parallel to the central axis of rotation of the first and second robotic actuators, wherein the at least one ridge has a side that is concave or flat and defines a target area that is positioned so that, when the first and second robotic actuators are in the deployed state, at least a portion of a target object is provided in the target area and is secured in place between the distal ends of the first and second robotic actuators and the target area, respectively, wherein the at least one ridge is a first ridge, and further comprising a second ridge extending perpendicular to the first ridge.

2. The stabilization device of claim 1 , wherein distal tips of the actuators push respective ends of the target object around the first ridge of the stabilization device.

3. The stabilization device of claim 1 , wherein distal tips of the actuators push at least a portion of the target object into the first ridge.

4. The stabilization device of claim 1 , further comprising a third ridge extending parallel to the first ridge.

5. The stabilization device of claim 1 , wherein the second ridge is one of a plurality of perpendicular extending second ridges positioned so that gaps are formed between the second ridges, the first and second robotic actuators configured to push the target object into the gaps to distribute material included in the target object into the gaps.

6. The stabilization device of claim 1 , further comprising a third robotic actuator, and wherein the palm region comprises a space on the end effector base between the three robotic actuators into which the actuators extend when deployed.

7. A method comprising:
affixing the stabilization device of claim 1 to the robotic end effector; and
actuating the first and second robotic actuators to grasp the target object between the robotic actuators and the first ridge.

8. The method of claim 7 , further comprising providing soft robotic actuators as the robotic actuators.

9. The method of claim 8 , further comprising inflating the soft robotic actuators to a pressure of 9-13 pounds per square inch (PSI).

10. The method of claim 7 , further comprising positioning the robotic end effector so that a long axis of the first ridge of the stabilization device aligns with a long axis of the target object.

11. The method of claim 10 , further comprising reverse-actuating the first and second robotic actuators prior to moving the stabilization device into position.

12. The method of claim 7 , further comprising moving the stabilization device into contact with the target object before actuating the actuators.

13. The method of claim 7 , further comprising moving the stabilization device so that the stabilization device is spaced away from the target object but within a predetermined distance range prior to actuating the actuators.

14. The method of claim 7 , further comprising translating or rotating the robotic end effector while grasping the target object, the translating or rotating pushing the target object into the first ridge of the stabilization device.

Assignees

• Soft Robotics Inc

Inventors

• Curhan Jeffrey
• Womersley Thomas

Classifications

• B25J15/0023

  Gripper surfaces directly activated by a fluid (flexible fingers B25J15/12) · CPC title

• Y10S901/37

  Fluid motor · CPC title

• B25J15/12

  with flexible finger members · CPC title

• B25J9/142

  comprising inflatable bodies · CPC title

• B25J15/0033 Primary

  with gripping surfaces having special shapes · CPC title