Pulling detection device and moving body system comprising same

A pulling detection device comprising:

• a base having a plate-shaped foundation portion extending in a longitudinal direction;
• a first wall portion, a projection opposed to the first wall portion, and a second wall portion opposed to the projection arranged on the foundation portion in this order in the longitudinal direction;
• a movable rod including an attraction force generating portion, a movable switch body, and a pulling rod, the attraction force generating portion having, on one side, a second wall portion opposed surface opposed to the second wall portion, and on another side, an attraction force generating surface, the movable switch body having a first wall portion opposed surface opposed to the first wall portion, a projection opposed surface opposed to a side of the projection opposed to the first wall portion, and an attraction surface attracted by the attraction force generating surface, the pulling rod extending from the second wall portion opposed surface so as to penetrate the second wall portion, the movable rod being movable along the foundation portion in the longitudinal direction of the foundation portion, while movement of the movable rod toward one side of the foundation portion in the longitudinal direction is restricted by contact between the first wall portion and the first wall portion opposed surface and movement of the movable rod toward another side of the foundation portion in the longitudinal direction is restricted by contact between the projection and the projection opposed surface;
• an elastic body provided between the second wall portion opposed surface and the second wall portion so as to press the second wall portion opposed surface, the elastic body being extendable/contractible in the longitudinal direction of the foundation portion;
• a first switch which operates by contact/separation between the first wall portion and the first wall portion opposed surface;
• and
• a second switch which operates by the attraction surface and the attraction force generating surface being separated from each other due to contact between the projection and the projection opposed surface.

A pulling detection device, comprising:

• a base having a plate-shaped foundation portion extending in a longitudinal direction;
• a first wall portion, N projections, a last projection, and a second wall portion arranged on the foundation portion in this order in the longitudinal direction;
• and
• a first pulling detection extension unit having, on one of sides across the first projection, a first wall portion opposed surface opposed to the first wall portion, and on another side, an attraction structure portion,
• in a case where N is 1, the pulling detection device comprising:
• a movable rod including a switch operation body and a pulling rod, the switch operation body having a last attraction structure surface opposed to the attraction structure portion, a projection opposed surface opposed to a surface on the first wall portion side of the projection, and a second wall portion opposed surface opposed to the second wall portion, the pulling rod extending from the second wall portion opposed surface so as to penetrate the second wall portion, the movable rod being movable along the foundation portion in the longitudinal direction of the foundation portion, while movement of the movable rod toward one side of the foundation portion in the longitudinal direction is restricted by contact between the first wall portion and the first wall portion opposed surface and movement of the movable rod toward another side of the foundation portion in the longitudinal direction is restricted by contact between the projection and the projection opposed surface;
• an elastic body provided between the second wall portion opposed surface and the second wall portion so as to press the second wall portion opposed surface, the elastic body being extendable/contractible in the longitudinal direction of the foundation portion;
• a switch which operates by contact/separation between the first wall portion and the first wall portion opposed surface;
• a first switch which operates by contact/separation between the attraction structure portion and the last attraction structure surface;
• and
• a second switch which operates by contact/separation between the projection and the projection opposed surface, wherein
• one of the attraction structure portion and the last attraction structure surface is formed to be an attraction force generating surface, and another one is formed to be an attraction surface attracted by the attraction force generating surface, and
• a distance X1 from an opposed surface opposed to the projection on a side having the first wall portion opposed surface in the first pulling detection extension unit, to the projection, a distance Xm from the projection opposed surface to the projection, and a distance Xs from the second wall portion opposed surface to the second wall portion, satisfies X1<Xm<Xs, when the first wall portion is pressed by the first wall portion opposed surface,
• in a case where N is not less than 2, the pulling detection device comprising:
• the first pulling detection extension unit, and (N−1) pulling detection extension units from a second pulling detection extension unit to an ith pulling detection extension unit each having an attraction structure surface on the first wall portion side across the ith projection, and the attraction structure portion on another side, i being an integer from 2 to N;
• a movable rod including a switch operation body, and a pulling rod, the switch operation body having a last attraction structure surface opposed to the Nth pulling detection extension unit, a last projection opposed surface opposed to a side of the last projection opposed to the first wall portion, and a second wall portion opposed surface opposed to the second wall portion, the pulling rod extending from the second wall portion opposed surface so as to penetrate the second wall portion, the movable rod being movable along the foundation portion in the longitudinal direction of the foundation portion, while movement of the movable rod toward one side in the longitudinal direction is restricted by contact between the first wall portion and the first wall portion opposed surface and movement of the movable rod toward another side in the longitudinal direction is restricted by contact between the last projection and the last projection opposed surface;
• an elastic body provided between the second wall portion opposed surface and the second wall portion so as to press the second wall portion opposed surface, the elastic body being extendable/contractible in the longitudinal direction of the foundation portion;
• a switch 1 which operates by contact/separation between the first wall portion and the first wall portion opposed surface;
• a switch i which operates by contact/separation between the (i−1)th pulling detection extension unit and the ith pulling detection extension unit;
• a first switch which operates by contact/separation between the Nth pulling detection extension unit and the last attraction structure surface;
• and
• a second switch which operates by contact/separation between the last projection and the last projection opposed surface, wherein
• one of the attraction structure portion, and the attraction structure surface or the last attraction structure surface, is an attraction force generating surface, and another one is an attraction surface attracted by the attraction force generating surface, and
• a distance Xi−1 from an opposed surface against the (i−1)th projection on the first wall portion side in the (i−1)th pulling detection extension unit, to the (i−1)th projection, a distance Xi from an opposed surface against the ith projection on the first wall portion side in the ith pulling detection extension unit, to the ith projection, a distance Xm2 from the last projection opposed surface to the last projection, and a distance Xs2 from the second wall portion opposed surface to the second wall portion, are set to satisfy Xi−1<Xi and XN<Xm2<Xs2, when the first wall portion is pressed by the first wall portion opposed surface.