Lid body locking apparatus of railcar
A locking apparatus includes a shaft member having an operating shaft of a non-circular shape in cross section, and a body member including a bearing part and a cylindrical part. A cover member of a ring shape is fixed to the inner circumferential surface of the cylindrical part, at a position corresponding to a tip end of the operating shaft, and a movable member is slidably fitted onto the operating shaft. The movable member is configured so that it is located at a normal position where the movable member fills a clearance between the operating shaft and the cover member when a latch member engages with the car body, and the movable member is maintained at a retreated position that is retreated from the normal position when the movable member is plunged, the operating shaft is rotated, and the engagement between the latch member and the car body is released.
1. A lid body locking apparatus of a railcar, for locking a lid body to a car body of the railcar in a state where the lid body closes an opening formed in the car body, the lid body being configured to open and close the opening, the apparatus comprising:
a shaft member having one end portion formed with an operating shaft of a non-circular shape in cross section and another end portion fixed to a latch member that engages with the car body to lock the lid body to the car body;
a body member penetrating the lid body, and including a bearing part for rotatably supporting an intermediate part of the shaft member and a cylindrical part for accommodating the operating shaft;
a cover member of a ring shape, fixed to an inner circumferential surface of the cylindrical part at a position corresponding to a tip end of the operating shaft, and defining a clearance around the operating shaft; and
a movable member slidably fitted onto the operating shaft, wherein:
the movable member is configured to be located at a normal position where it fills the clearance between the operating shaft and the cover member when the latch member engages with the car body, and
the movable member is configured to be maintained at a retreated position that is retreated from the normal position when the engagement between the latch member and the car body is released by:
firstly, pushing the movable member together with a tool such that the tool and the movable member are moved together along the operating shaft,
secondly, rotating the operating shaft and the movable member with the tool, and
thirdly, separating the tool from the movable member, causing the movable member to be maintained in the retreated position.
2. The lid body locking apparatus of the railcar of claim 1 , wherein the movable member includes a base plate part that is able to contact a back side of the cover member, and a projected portion projecting from the base plate part to fill the clearance between the operating shaft and the cover member, and
wherein the apparatus further comprises a spring member for biasing the movable member toward the cover member.
3. The lid body locking apparatus of the railcar of claim 2 , wherein at least one engagement groove extends in an axial direction of the shaft member and is formed in an inner circumferential surface of the cover member, and
wherein the projected portion of the movable member includes a central base portion of a tubular shape, and at least one engaging pawl portion that radially projects from the central base portion and engages with the at least one engagement groove when the movable member is located at the normal position.
4. The lid body locking apparatus of the railcar of claim 2 , wherein the spring member is a coil spring arranged to surround the operating shaft.
5. The lid body locking apparatus of the railcar of claim 1 , wherein the latch member includes a mounting part mounted to the other end portion of the shaft member, and a latch portion of a rectangular plate shape formed continuously to the mounting part, and the latch member engages with the car body by locating the latch portion inside a latch receiving portion of the car body.
6. The lid body locking apparatus of the railcar of claim 1 , wherein an external surface of the lid body, surfaces of the body member and the cover member form a single surface.
7. A lid body locking apparatus of a railcar, for locking a lid body to a car body of the railcar in a state where the lid body closes an opening formed in the car body, the lid body being configured to open and close the opening, the apparatus comprising:
a shaft member having one end portion formed with an operating shaft of a non-circular shape in cross section and another end portion fixed to a latch member that engages with the car body to lock the lid body to the car body;
a body member penetrating the lid body, and including a bearing part for rotatably supporting an intermediate part of the shaft member and a cylindrical part for accommodating the operating shaft;
a cover member of a ring shape, fixed to an inner circumferential surface of the cylindrical part at a position corresponding to a tip end of the operating shaft, and defining a clearance around the operating shaft; and
a movable member slidably fitted onto the operating shaft, wherein:
the movable member is configured to be located at a normal position where it fills the clearance between the operating shaft and the cover member when the latch member engages with the car body,
the movable member is configured to be maintained at a retreated position that is retreated from the normal position when the engagement between the latch member and the car body is released by pushing into the movable member and rotating the operating shaft,
the movable member includes a base plate part that is able to contact a back side of the cover member, and a projected portion projecting from the base plate part to fill the clearance between the operating shaft and the cover member,
the apparatus further comprises a spring member for biasing the movable member toward the cover member,
at least one engagement groove extends in an axial direction of the shaft member and is formed in an inner circumferential surface of the cover member,
the projected portion of the movable member includes a central base portion of a tubular shape, and at least one engaging pawl portion that radially projects from the central base portion and engages with the at least one engagement groove when the movable member is located at the normal position,
the operating shaft is rotated by a tool,
the tool includes a hollow pushing part having a recessed portion that is engageable and disengageable with/from the operating shaft and for pushing into the movable member, and a pushing pawl portion provided to the hollow pushing part and corresponding to the at least one engaging pawl portion,
the at least one engagement groove includes two engagement grooves, and
the cover member is configured so that the tool is plunged to engage the operating shaft with the recessed portion while inserting the pushing pawl portion into one of the engagement grooves, the entire tool is rotated to release the engagement between the latch member and the car body, and the pushing pawl portion can then be pulled out from the other one of the engagement grooves.
8. The lid body locking apparatus of the railcar of claim 3 , wherein the spring member is a coil spring arranged to surround the operating shaft.
9. The lid body locking apparatus of the railcar of claim 2 , wherein the latch member includes a mounting part mounted to the other end portion of the shaft member, and a latch portion of a rectangular plate shape formed continuously to the mounting part, and the latch member engages with the car body by locating the latch portion inside a latch receiving portion of the car body.
10. The lid body locking apparatus of the railcar of claim 3 , wherein the latch member includes a mounting part mounted to the other end portion of the shaft member, and a latch portion of a rectangular plate shape formed continuously to the mounting part, and the latch member engages with the car body by locating the latch portion inside a latch receiving portion of the car body.
11. The lid body locking apparatus of the railcar of claim 4 , wherein the latch member includes a mounting part mounted to the other end portion of the shaft member, and a latch portion of a rectangular plate shape formed continuously to the mounting part, and the latch member engages with the car body by locating the latch portion inside a latch receiving portion of the car body.
12. The lid body locking apparatus of the railcar of claim 2 , wherein an external surface of the lid body, surfaces of the body member and the cover member form a single surface.
13. The lid body locking apparatus of the railcar of claim 3 , wherein an external surface of the lid body, surfaces of the body member and the cover member form a single surface.
14. The lid body locking apparatus of the railcar of claim 4 , wherein an external surface of the lid body, surfaces of the body member and the cover member form a single surface.
15. The lid body locking apparatus of the railcar of claim 5 , wherein an external surface of the lid body, surfaces of the body member and the cover member form a single surface.
16. The lid body locking apparatus of the railcar of claim 3 , wherein the at least one engaging pawl portion contacts at least one stopper protruded piece part of the body member so as to maintain the movable member in the retreated position.