Robot hand for high load work

• US 6,857,174 B2
• Filed: 01/14/2003
• Issued: 02/22/2005
• Est. Priority Date: 01/15/2002
• Status: Expired due to Fees

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: Morita, Hiroyuki
• Primary Examiner(s): Hong, John C.
• Application Number:
  US10/341,943
• Publication Number:
  US 20030131459A1
• Time in Patent Office: 770 Days
• Field of Search: 292/42, 297/00, 297/17, 297/18, 292/40, 292/811, 292/815, 411/14.5, 901/41, 901/27, 901/19
• US Class Current: 29/240
• CPC Class Codes: B23P 19/02 for connecting objects by press fit or for detaching same B23P19/10 takes precedence
• CPC Class Codes: B23P 19/06 Screw or nut setting or loosening machines
• CPC Class Codes: B23Q 11/0028 by actively reacting to a change of the configuration of the machine B23Q15/00 takes precedence
• CPC Class Codes: B25B 23/0078 Reaction arms
• CPC Class Codes: B25J 15/0019 End effectors other than grippers
• CPC Class Codes: B25J 15/0095 with an external support, i.e. a support which does not belong to the manipulator or the object to be gripped, e.g. for maintaining the gripping head in an accurate position, guiding it or preventing vibrations
• CPC Class Codes: B25J 19/0091 Shock absorbers in general F16F
• CPC Class Codes: Y10T 29/53687 by rotation of work part
• CPC Class Codes: Y10T 29/537 tool handle and tool

Abstract

High load screwing work, calking work, or press-fitting work ancillary to assembly work can be performed by a low rigidity robot such as a tabletop robot by, in the screwing work, returning the torque applied to one of the bolt and nut from a rotation drive unit such as a motor and reduction gear to the casing part of the rotation drive unit through a relative rotation inhibiting mechanism supporting the other and, in the calking work or press-fitting work, returning the action force applied from a driving means such as an air cylinder to the calking punch etc. to the casing part of the driving means through the workpiece and grip parts. Therefore, the path of transmission of the torque or action force is kept inside the robot hand and does not leak to the outside.

Claims

1. A robot hand for screwing work provided with:

a rotation driving means driving rotation of one of a male screw member and female screw member for causing said screw members to engage,

a supporting means connected with an end of a robot arm of a robot body for supporting said rotation driving means,

a holding means for holding the other of said screw members at a predetermined position of said robot body, and

a relative rotation inhibiting mechanism for connecting said supporting means and said holding means at the time of screwing and inhibiting relative rotation between the two.

2. A robot hand for screwing work as set forth in claim 1, further provided with a means for loosely attaching said holding means and a stationary part of said robot body facing the same.

3. A robot hand for screwing work as set forth in claim 2, wherein said loose attaching means is comprised of a plurality of projections provided at one of said holding means and a stationary part of said robot body and projecting out toward the other and a plurality of holes formed at the other of said holding means and stationary part of said robot body and loosely receiving said projections.

4. A robot hand for screwing work as set forth in claim 1, further provided with a shock absorbing means between the end of said robot arm and said supporting means.

5. A robot hand for screwing work as set forth in claim 4, wherein said shock absorbing means is comprised of elastic rubber.

6. A robot hand for screwing work as set forth in claim 4, wherein said shock absorbing means is comprised of a spring.

7. A robot hand for screwing work as set forth in claim 1, wherein said relative rotation inhibiting mechanism is comprised of a plurality of pins provided at one of said supporting means and said holding means and projecting toward the other and a plurality of holes provided at the other of said supporting means and said holding means and receiving said pins.

8. A robot hand for screwing work as set forth in claim 1, wherein an assembly use tabletop robot is used as said robot body.