Locking devices for swing doors and ladder / boom vehicles equipped with such devices

Abstract

To provide a swing-door-oriented locking device which is applicable to a basket on a ladder / boom-mounted vehicle, produced at a low cost, and excellent in operation.SOLUTION: A swing-door-oriented locking device 10, including a lock body 11, a restricting body 12 for restricting an upward movement of the lock body 11, and a lock engaging body 13 to come into contact with the lock body 11 when a swing door 9 is closed. When the swing door 9 is closed, the lock engaging body 13 that approaches the lock body 11 from one side pushes the lock body away and advances to the other side, the lock body 11 moves upward from a fixed position while drawing an arc as the lock body 11 is pushed by the lock engaging body 13, and returns to the fixed position when the lock engaging body 13 passes to the other side: and when the swing door 9 is closed, the lock body 11 abuts against the restricting body 12 even if the lock engaging body 13 pushes it from the other side, and does not move from the fixed position, and a locked state is maintained.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a locking device for a hinged door, such as a door or gate provided at the entrance or exit of a basket of a fire ladder truck, when the door is closed. [Background technology]

[0002] BACKGROUND ART Vehicles such as firefighting ladder trucks and aerial work platforms are known that are equipped with a basket or cage at the end of an extendable ladder or boom for a person to ride in. For example, Patent Document 1 discloses a basket of an aerial work platform in which a door that opens and closes a boarding / alighting opening comprises three horizontal link members arranged at a predetermined interval in the vertical direction and one vertical link member, one end of the horizontal link members being connected to a support pillar erected on one side edge of the boarding / alighting opening via a first pivot (link joint) so as to be freely rotatable in the vertical direction, and the other end of the horizontal link members being connected to the vertical link members via a second pivot (link joint) so as to be freely rotatable in the vertical direction, and when the door is lifted diagonally upward, the horizontal link member pivots upward and the door moves in a folded state to a position near the support pillar on one side edge of the boarding / alighting opening. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-024668 Summary of the Invention [Problem to be solved by the invention]

[0004] According to Patent Document 1, the space required for opening and closing the basket door can be minimized, the door can be opened and closed with minimal effort, and passengers can smoothly board and disembark through the boarding / alighting opening when the door is opened. However, because the structure is somewhat complicated, it can be more expensive than other methods. Therefore, an object of the present invention is to provide a low-cost, easy-to-use swing door locking device that can be applied to the baskets of ladder / boom-equipped vehicles such as fire ladder trucks and aerial work vehicles, as well as a ladder / boom-equipped vehicle equipped with said device. [Means for solving the problem]

[0005] The hinged door locking device 10 of the present invention described in claim 1 comprises: It is attached to the tip of the ladder or boom and is provided with a basket 7 whose floor surface may be in an approximately horizontal or vertical state. A locking device that locks a hinged door 9 installed at an entrance / exit, The hinged door 9 opens and closes relative to the basket 7 via a hinge. The lock body 11 is provided at the entrance and can be moved upward from a fixed position, a restricting body 12 is provided adjacent to one side of the lock body 11 and restricts the upward movement of the lock body 11, and a lock engaging body 13 is provided at the hinged door 9 and comes into contact with the lock body 11 when the hinged door 9 is closed. A pressing body 14 presses down the lock body 11 in a fixed position from above, and a biasing body 15 biases the pressing body 14 downward. When the swing door 9 is closed, the lock engaging body 13 approaches the lock main body 11 from one side, pushes the lock main body 11 aside, and advances to the other side, and the lock main body 11 moves upward from its fixed position in an arc as it is pushed by the lock engaging body 13, and returns to its fixed position when the lock engaging body 13 passes to the other side, and when the swing door 9 is closed, the lock main body 11 abuts against the regulating body 12 and does not move from its fixed position even if it is pushed from the other side by the lock engaging body 13, so that the locked state is maintained. Claim 2 The present invention as described is Claim 1 In the described hinged door locking device 10, the lock body 11 is cylindrical and has a mandrel 16 that passes through the lock body 11 in the axial direction and supports 17 that support both ends of the mandrel 16, and the lock body 11 is characterized in that it is suspended from the mandrel 16 when in a fixed position. Claim 3 The present invention as described is Claim 2 In the lock device 10 for a hinged door described above, the inside diameter of the lock body 11 is 1.5 times or more and 8 times or less the outside diameter of the mandrel 16. Claim 4 The present invention as described is Claim 2 or Claim 3In the lock device 10 for a hinged door described above, the lock body 11 is characterized in that it has a length of 10 mm or more and an outer diameter that is 1 to 5 times the length. Claim 5 The present invention as described is Claim 2 from Claim 4 In the lock device 10 for a hinged door described in any one of the above, the lock body 11 has a cross section that is a perfect circle. Claim 6 The present invention as described is Claim 2 from Claim 5 In the hinged door lock device 10 described in any one of the above, the axle 16 is a bolt, and both ends of the bolt are fixed to the support 17 with nuts. Claim 7 The ladder / boom-mounted vehicle of the present invention as described above comprises the following: Claim 6 The hinged door locking device 10 according to any one of the claims The aforementioned It is characterized by being equipped in the basket 7. [Effects of the Invention]

[0006] According to the present invention, a low-cost, easy-to-use hinged door locking device can be provided that can be applied to the baskets of ladder / boom-equipped vehicles such as fire ladder trucks and aerial work platforms. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 shows a fire ladder truck according to an embodiment of the present invention. [Figure 2] A diagram showing the basket of the fire ladder truck [Figure 3] FIG. 10 is a diagram showing the vicinity of the locking device for the hinged door of the basket. [Figure 4] FIG. 10 is a partially see-through side view of the locking device. [Figure 5] FIG. 10 is a partially transparent perspective view of the lock body and its surroundings. [Figure 6] A diagram showing the operation of the locking device when the swing door is closed. [Figure 7] FIG. 10 shows the operation of the locking device when the part of the lock body below the axle is pushed to the other side in the locked state. [Figure 8] A diagram showing the operation of the locking device when the swing door is opened. [Figure 9] FIG. 10 is a view showing the periphery of a locking device for a hinged door in a basket according to another embodiment of the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0008] A locking device for a hinged door according to a first embodiment of the present invention comprises: Provided for a basket attached to the end of a ladder or boom, the floor of which may be in an almost horizontal or almost vertical state. A locking device for locking a hinged door installed at an entrance, The hinged door opens and closes relative to the basket. A lock body is provided at the entrance and can be moved upward from a fixed position; a restricting body is provided adjacent to one side of the lock body and restricts the upward movement of the lock body; and a lock engaging body is provided at the hinged door and comes into contact with the lock body when the hinged door is closed. A pressing body that presses down on the lock body in a fixed position from above, and a biasing body that biases the pressing body downward. When the swing door is closed, the lock engaging body that approaches the lock main body from one side pushes the lock main body aside and advances to the other side, and the lock main body moves upward from its fixed position in an arc as it is pushed by the lock engaging body, and returns to its fixed position when the lock engaging body passes through to the other side, and when the swing door is closed, the lock main body abuts against the regulating body and does not move from its fixed position even if it is pushed from the other side by the lock engaging body, so that the locked state is maintained. According to this embodiment, the swing door can be automatically locked when it is closed. In addition, even if the lock engagement body presses the lock body in the locked state, the lock is not released, so the swing door can be prevented from opening unintentionally. Note that when the swing door is closed, the lock body "does not move from the predetermined position" does not only mean that it does not move from the predetermined position strictly, but also means that it moves very little to the extent that the locked state is maintained. In addition, it is possible to more reliably prevent the lock body from shifting from its fixed position due to shaking or the like, causing the swing door to open unintentionally.

[0009] The present invention No. 2 The embodiment of the present invention is 1stIn the embodiment of the locking device for a swing door, the lock body is cylindrical and has a mandrel that passes through the lock body in the axial direction and supports that support both ends of the mandrel, and when the lock body is in a fixed position, it is suspended from the mandrel. According to this embodiment, the function of the locking device can be easily and sufficiently exhibited.

[0010] The present invention Third The embodiment of the present invention is No. 2 In the lock device for a hinged door according to the embodiment, the inside diameter of the lock body is 1.5 times or more and 8 times or less the outside diameter of the shaft. According to this embodiment, by making the inner diameter of the lock body sufficiently larger than the outer diameter of the mandrel, the lock body, which is pressed by the lock engaging body when the hinged door is closed, can move upward smoothly.

[0011] The present invention Fourth The embodiment of the present invention is No. 2 or Third In the lock device for a hinged door according to the embodiment, the lock body has a length of 10 mm or more and an outer diameter of 1 to 5 times the length. According to this embodiment, by making the outer diameter of the lock body equal to or larger than the length of the lock body, the lock body is more likely to abut firmly against the regulating body, so that even if the lock body is pushed in the opening direction when the swing door is closed, the lock body can be more reliably prevented from moving upward.

[0012] The present invention No. 5 The embodiment of the present invention is No. 2 from Fourth In the lock device for a hinged door according to any one of the above embodiments, the lock body has a circular cross section. According to this embodiment, even if the part of the lock body that comes into contact with the lock engagement body or the regulating body changes each time the swing door is opened or closed as the lock body rotates, the state of contact remains the same, so the degree to which the lock body is pushed up by the lock engagement body and the degree to which the lock body engages with the regulating body do not change, and the function of the lock device can be consistently performed. Furthermore, because the feel is the same no matter which part of the outer surface of the lock body is touched, firefighters and others who lift the lock body to open the swing door can concentrate on their work without feeling any discomfort.

[0013] The present invention No. 6 The embodiment of the present invention is No. 2 from No. 5 In the locking device for a hinged door according to any one of the above embodiments, the axle is a bolt, and both ends of the bolt are fixed to the support by nuts. According to this embodiment, the mandrel and the members used for attaching it can be easily procured, and costs can be reduced.

[0014] The present invention Seventh The ladder / boom-equipped vehicle according to the embodiment of the present invention is No. 6 A locking device for a hinged door according to any one of the above embodiments. ba It is in preparation for sket. According to this embodiment, the locking device for the hinged door of the basket can be made easier to operate and less expensive. [Example]

[0015] Hereinafter, a hinged door locking device according to one embodiment of the present invention will be described. FIG. 1 is a view showing a fire ladder truck according to this embodiment, FIG. 2 is a view showing a basket of the fire ladder truck, and FIG. 3 is a view showing the periphery of a locking device for a hinged door in the basket. A fire ladder truck is a type of ladder / boom-equipped vehicle that is equipped with a ladder or boom, and is equipped with a cabin 1 located at the front of the vehicle and having a driver's seat, a body 2 located behind the cabin 1, a ladder 3 that is stored in a prone position above the cabin 1 and body 2, a gyro turntable 4 located at the rear of the body 2, a support frame 5 that is located on top of the gyro turntable 4 and supports the rear end of the ladder 3, a support device 6 that supports the ladder 3 from below in a position close to the rear of the cabin 1, a basket 7 attached to the tip of the ladder 3, and outriggers 8. The basket 7 has entrances on both sides through which firefighters get on and off, and the entrances are provided with gates (doors) 9 attached to the basket body via hinges. During firefighting or rescue operations, the floor of the basket 7 is in a nearly horizontal state (facing forward), but when the ladder is stored (contained) during travel, the floor rotates upward by 90 degrees from that state to a nearly vertical state (with the gate facing upward). In the following explanation, the directions of "up" and "down" refer to the state in which the entrance and exit face forward. The gate 9 is an inward-opening door and is provided with a locking device 10 used for locking.

[0016] FIG. 4 is a partially see-through side view of the lock device, and FIG. 5 is a partially see-through perspective view of the periphery of the lock body. The locking device 10 comprises a cylindrical locking body 11 that is installed at an entrance and can be moved upward from a fixed position, a regulating body 12 that is installed adjacent to one side of the locking body 11 and regulates the upward movement of the locking body 11 around that side, a lock engaging body 13 that is installed at the gate 9 and comes into contact with the locking body 11 when the gate 9 is closed, a plate-shaped pressing body 14 that presses the locking body 11 from above when it is in a fixed position, a biasing body 15 that biases the pressing body 14 downward, a mandrel 16 that is passed through the locking body 11, and supports 17 that support both ends of the mandrel 16.

[0017] The lock body 11 is a cylinder with a circular cross section and is positioned with its axial direction horizontal. The mandrel 16 is positioned in a hollow portion of the lock body 11, penetrating the lock body 11 in the axial direction. When the lock body 11 is not being pushed up by a human hand or the lock engagement body 13, it remains in a fixed position while hanging from the mandrel 16. In this state, when the portion below the mandrel 16 is pushed horizontally from one side or from below, it moves upward. This allows the lock device to function simply and sufficiently, as described below. Furthermore, the cylinder that forms the lock body 11 can be formed by cutting an ordinary metal pipe to a predetermined length, which simplifies the manufacture of the lock device 10 and reduces costs. The mandrel 16 in this embodiment is a bolt with threads on both ends, which are passed through holes in the support 17 and secured with nuts 18. Installation using bolts and nuts is relatively easy, so the installation work of the lock body 11 and mandrel 16 can be carried out efficiently. Furthermore, because common bolts and nuts can be used, it is easy to procure the mandrel 16 and the parts used for its installation, which helps to reduce costs.

[0018] In this embodiment, the regulating body 12 and the support body 17 are integrally formed from a member consisting of a back plate and two side plates, with the back plate serving as the regulating body 12 and the side plates serving as the support body 17. A hole for passing the mandrel 16 through is drilled in each of the two side plates. In this embodiment, a spring hinge is used as the biasing body 15. One hinge piece 15a of the spring hinge is attached to the regulating body 12, and the other hinge piece 15b is attached to the rear end side of the pressing body 14. The pressing body 14 is tilted downward in front, and the lower surface of the tip side is in contact with the lock main body 11.

[0019] Lock engagement body 13 is composed of a rod-shaped member and has support portion 13a that extends perpendicularly to gate 9 with its base end inside gate 9, and engagement portion 13b that extends at a 90-degree angle from the tip of support portion 13a. The length of support portion 13a is greater than the outer diameter of lock main body 11, and the space between gate 9 and engagement portion 13b is where lock main body 11 fits.

[0020] FIG. 6 is a diagram showing the operation of the locking device when the hinged door is closed. 6(a) shows the gate 9 approaching the opening of the entrance / exit of the basket 7 from one side (inside the basket). The lock engagement body 13 is positioned away from the lock body 11, and the lock body 11 is in a fixed position hanging from the spindle 16. Figure 6(b) shows the state in which the gate 9 continues to close, and the engagement portion 13b of the lock engagement body 13 that has entered the basket 7 comes into contact with and begins to push against the lock main body 11. The engagement portion 13b abuts on the lock main body 11 below the axle 16. When the pushing force of the lock engagement body 13 exceeds the pressing force of the pressing body 14, the lock main body 11 moves to the other side (outside the basket) and is guided by the axle 16 and gradually pushed up in an arc. 6(c) and (d) show the state in which the gate 9 continues to close, and the lock main body 11 continues to rise and rides onto the engaging portion 13b of the lock engaging body 13. 6(e) shows the state in which the gate 9 is completely closed and locked. In the locked state, the engagement portion 13b of the lock engagement body 13 is located on the other side of the lock main body 11, and the lock main body 11 returns to its original position and fits into the space between the gate 9 and the engagement portion 13b. In this way, when closing the gate 9, the lock engagement body 13 approaches the lock body 11 from one side, pushes the lock body 11 aside, and moves to the other side. As the lock body 11 is pushed by the lock engagement body 13, it moves upward in an arc from its home position, and returns to its home position when the lock engagement body 13 passes by to the other side.

[0021] FIG. 7 is a diagram showing the operation of the locking device when the part of the lock body below the axle is pressed from the other side in the locked state. When the lock body 11 is pushed from the other side, it moves to one side and is lifted slightly in an arc, but because the restricting body 12 is adjacent to it on one side, it becomes caught on the restricting body 12 and cannot move upward any further. Therefore, the engaging portion 13b of the lock engaging body 13 cannot push the lock body 11 aside and move to one side. In this way, the closed gate 9 is automatically locked by the locking device 10. Furthermore, when the gate 9 is closed, the lock body 11 abuts against the regulating body 12 and barely moves from its fixed position even when pushed from the other side by the engaging portion 13b of the lock engaging body 13, etc., so the locked state is maintained and the gate 9 can be prevented from opening unintentionally. In particular, in the case of the basket 7 of a fire ladder truck, when the ladder 3 is stored, such as while the truck is traveling, the gate faces upward and the engaging portion 13b of the lock engaging body 13 is positioned above the lock body 11, so that the engaging portion 13b always pushes the lock body 11 in the opening direction, but the locked state can be maintained even in this state. Furthermore, because the retaining body 14 holds the lock body 11 in place, the lock body 11 will not shift from its fixed position due to vibration or the like, and it is possible to more reliably prevent the lock from being released unintentionally and opening the gate 9. This is particularly useful when the locking device 10 is attached to something that swings, such as the basket 7 of a fire ladder truck. Furthermore, by biasing the pressing body 14 in the direction of pressing the lock body 11 by the spring hinge that is the biasing body 15, it is possible to more reliably prevent the lock body 11 from shifting from its fixed position due to vibration or the like.

[0022] FIG. 8 is a diagram showing the operation of the locking device when the hinged door is opened. 8(a) shows the gate 9 in a locked state. As mentioned above, the gate 9 cannot be opened in this state. 8(b) shows the process of unlocking the gate 9. When a firefighter or other person opens the gate 9, they lift the lock body 11 with their hands or other means. This allows the engaging portion 13b of the lock engaging body 13 to pass under the lock body 11. 8(c) and (d) show the state when the gate 9 begins to open. The engagement portion 13b of the lock engagement body 13 passes under the lock main body 11, which has been raised from its fixed position, and moves to one side. Note that once the engagement portion 13b moves to a position where it comes into contact with the lock main body 11 to support it from below, there is no need to lift the lock main body 11 by hand. When the engaging portion 13b is completely removed to one side, the lock body 11 loses support from below and returns to its original position. In this way, opening the gate 9 requires only one operation with one hand, as all that is required is to push up the lock body 11 with one hand while pressing the lock engagement body 13. In contrast, with conventional locks that use a latch, opening the gate 9 requires sliding the latch out and then pressing the gate 9, which requires at least two operations with one or both hands.

[0023] The inner diameter of the lock body 11 is formed to be larger than the outer diameter of the mandrel 16 that is passed through it. The inner diameter of the lock body 11 is preferably 1.5 to 8 times the outer diameter of the mandrel 16. By making the inner diameter of the lock body 11 sufficiently larger than the outer diameter of the mandrel 16, the lock body 11 that is pressed by the engaging portion 13b of the lock engaging body 13 when the gate 9 is closed can move smoothly upward. Furthermore, it is preferable that the length of the lock body 11 is 10 mm or more and the outer diameter is 1 to 5 times the length of the lock body 11. By making the length of the lock body 11 a predetermined length or more and making the outer diameter equal to or greater than that length, the lock body 11 is more likely to abut firmly against the regulating body 12, so that even if the lock body 11 is pressed from the other side by the engaging portion 13b of the lock engaging body 13 in the locked state, the lock body 11 can be more reliably prevented from moving upward and releasing the lock. Note that if the length of the lock body 11 is too long, it is likely to interfere with other components, so it is preferable that the length be 50 mm or less. Furthermore, the difference (thickness) between the outer diameter and the inner diameter of the lock body 11 is, for example, approximately 1 mm to 5 mm.

[0024] Although the lock body 11 can be made cylindrical with an oval or polygonal cross section, if it is made cylindrical with a perfect circular cross section as in this embodiment, the lock body 11 is free to rotate, and even if the part of the lock body 11 that comes into contact with the lock engagement body 13 or the regulating body 12 changes each time the gate 9 is opened or closed, the contact state remains the same, so the degree to which the lock engagement body 13 pushes up the lock body 11 and the degree to which the lock body 11 engages with the regulating body 12 do not change, allowing the lock device to function consistently. Also, because the feel is the same no matter which part of the exterior of the lock body 11 is touched, firefighters and others who lift the lock body 11 to open the gate 9 can concentrate on their work without feeling any discomfort.

[0025] Hereinafter, a hinged door locking device according to another embodiment of the present invention will be described, in which the same functional members as those in the above-described embodiment are designated by the same reference numerals and will not be described again. 9A and 9B are diagrams showing the periphery of the locking device for the hinged door of the basket according to this embodiment, with Fig. 9A being a perspective view and Fig. 9B being a front view. Note that Fig. 9B does not show the lock engaging body. In the locking device 100 of this embodiment, an index plunger is used, the pin of the index plunger is the pressing body 140, and the built-in spring of the index plunger is the biasing body 150. The index plunger is attached to one of the two side panels that extends vertically upward, serving as support body 17, by means of two nuts, one above and one below, through mounting holes in the horizontal upper part that bends toward the other side panel. The pin that serves as presser body 140 is urged downward by a built-in spring that serves as biasing body 150, and presses down on lock body 11, which is in a fixed position, from above. In this way, by using the index plunger as the pressing body 140 and the biasing body 150, it is possible to more reliably prevent the lock body 11 from shifting from its fixed position due to vibration or the like, causing the lock to be unintentionally released and opening the gate 9. In addition, since a general index plunger can be used, procurement of parts becomes easy, and costs can be reduced. [Industrial Applicability]

[0026] The swing door locking device 10 of the present invention can be applied to a gate 9 provided at the entrance / exit of a basket 7 attached to the ladder body or the end of the boom of a ladder / boom-equipped vehicle such as a fire ladder truck, thereby making it possible to make the swing door locking device in the basket 7 easier to operate and less costly than conventional devices. [Explanation of symbols]

[0027] 7. Basket 9 Swing door (gate) 10, 100 locking device 11 Lock body 12 Regulatory bodies 13 Lock engagement body 14, 140 presser foot 15, 150 biasing element 16 Mandrel 17 Support

Claims

1. A locking device that is attached to the tip of a ladder or boom and locks a hinged door provided at an entrance / exit of a basket whose floor surface may be in a substantially horizontal or vertical state, The hinged door opens and closes relative to the basket via a hinge, a lock body that is provided at the entrance and can be moved upward from a fixed position; a restricting body provided adjacent to one side of the lock body and restricting the lock body from moving upward; a lock engaging body that is provided on the hinged door and that comes into contact with the lock main body when the hinged door is closed; a presser body that presses down on the lock body in the fixed position; a biasing body that biases the presser body downward; Equipped with When closing the hinged door, The lock engagement body, which has approached the lock body from one side, pushes the lock body aside and moves to the other side, the lock body moves upward from the home position in an arc as it is pushed by the lock engagement body, and returns to the home position when the lock engagement body passes through to the other side; When the hinged door is closed, A locking device for a hinged door, characterized in that even when the lock body is pushed from the other side by the lock engaging body, it abuts against the regulating body and does not move from the fixed position, thereby maintaining the locked state.

2. The lock body is cylindrical, The lock body has a shaft that penetrates the lock body in the axial direction, and supports that support both ends of the shaft.

2. The hinged door locking device according to claim 1, wherein the lock body is suspended from the axle when in the fixed position.

3. 3. The locking device for a hinged door according to claim 2, wherein the inner diameter of the lock body is 1.5 to 8 times the outer diameter of the shaft.

4. 4. The locking device for a hinged door according to claim 2, wherein the lock body has a length of 10 mm or more and an outer diameter of 1 to 5 times the length.

5. The locking device for a hinged door according to any one of claims 2 to 4, wherein the lock body has a circular cross section.

6. 6. The hinged door locking device according to claim 2, wherein the axle is a bolt, and both ends of the bolt are fixed to the support body with nuts.

7. A ladder / boom-equipped vehicle, characterized in that the basket is provided with a hinged door locking device according to any one of claims 1 to 6.

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