JP2002227577A - Bite preventive mechanism of hooking metal fitting mounted on triple ladder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bite prevention mechanism of hooking metal fitting mounted on a triple ladder and a hooking mechanism capable of speedily and securely performing hooking operation by a hooking metal fitting mechanism mounted on the triple assembly ladder for emergency and fire fighting and consisting of support fitting and pressing fitting stored in a box when a ladder body moves vertically and is hooked. SOLUTION: This hooking fitting mechanism is constituted such that the hooking mechanism consisting of the support fitting and the pressing fitting engaging with it and turning which are stored in the box at a first connection and a third connection is securely hooked in the support fitting protruding from a box opening part when the support fitting and the pressing fitting engaging with it are engaged due to the vertical movement of a horizontal bar for applying a foot of the ladder body when the ladder body moves vertically through elastic spring action in the box and are pushed back into the box and the ladder body is hooked to prevent biting.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a locking mechanism which is mounted on a triple ladder used as an emergency ladder, such as a police or fire department, and which locks the ladder at a desired position when the ladder moves up and down. It is.

[0002]

2. Description of the Related Art A locking device to be attached to an emergency feeding triple ladder body such as a fire engine is disclosed in JP-B-55-41787, JP-B-63-60196, and JP-B-62-11648.
No. 6, No. 6 and the like have been implemented as a prior application, and the applicant has also implemented a modified prior application of Japanese Patent Application No. 9-972828 as a specialized manufacturer. Conventional latching mechanisms include a mechanism using a wire rope and a pulley, and a power supply drive that uses electric control in combination. The outline of the mechanism is, in the triple ladder of FIGS.
As shown in FIG. 4, a first ladder a, a second ladder b, and a third ladder c
As shown in FIGS. 4 and 5, the main rod A and the supporting rod B, and the horizontal rail S for footrest and the reinforcing rod H for preventing the ladder body from being opened at appropriate intervals are formed in a frame shape. FIG. 5 shows the first ladder a and the third ladder c.
FIG.
As shown in FIG. 7, the wire rope R and pulley (not shown) are operated to extend and retract the ladder body up and down when the ladder body is extended. When the bracket 05 is pivoted upward and the support bracket 04 protruding from the box 1 is pushed into the box, the ladder body is extended, and when the ladder body is hooked, the support projecting from the box 1 as shown in FIG. Bracket 04
And a mechanism for engaging the ladder body at a desired height position by hanging the support rod B of the second ladder b descending. However, after the upward movement of the second ladder b, the support fittings 04 and the presser fittings 05 return to the old position. In this case, in an emergency use, the presser fittings 05 which operate the rope at a considerable speed to extend and contract the ladder are provided by the ladder body. When the ladder body is moved up or down by an abrupt operation of the ladder body when the ladder body is moved up or down by the operator, the operation between the brackets is returned to the previous position.
There is a case where the holding metal fittings 05 bite between the upper and lower horizontal rails S of the ladder b and the first ladder a to hinder the extension and retraction operation of the ladder body, and there is a problem that the function of the emergency ladder body is lacking. In addition, when the support fitting of the hooking mechanism is attached to the third station, it is attached as shown in FIG. 1, and when it is attached to the first series of FIG. 5, the support fitting of FIG. Is supported by the support rod B. (Not shown)

[0003]

The technical problem to be solved by the present invention is as follows. First, a holding metal fitting and rotating with a supporting metal of a latch mechanism does not bite between supporting rods of a ladder body. That it is a ladder body that smoothly extends or hangs. Second
In addition, a simple mechanism that improves on the conventional mechanism and the electric combination mechanism to reduce the manufacturing cost. Third, it is an object to solve a practical mechanism having strength and durability.

[0004]

Means for achieving the above object are as follows: an upper supporting bracket which is rotated by urging a leaf spring or the like in a box; and a lower presser which is engaged with the lower supporting bracket. A latching mechanism consisting of a metal fitting is mounted on a square connecting ladder composed of a main rod A and a supporting rod B, a foot rail S and a reinforcing rod H and vertically connected or integrated together, and a wire and a pulley are attached. In the latch mechanism of the continuous ladder that moves up, down or latches to the desired height position by operating, the lower part of the support bracket of the latch mechanism is opened to the supporting rods of the first ladder and the third ladder in the form of an open leg. Formed on the ladder body with one side protruding leftward and the other side with a beak on the right side. The engaging projection provided on the metal fitting engages with the engaging part of the supporting metal, and the upper supporting metal is provided with a locking metal mechanism against the spring pressure of the leaf spring. The ladder body support rod pivots downwards against the spring pressure of the leaf spring of the latching bracket when the triple ladder body is allowed to move up and down and descends. When lowering the ladder body and hooking the ladder body, a triple ladder that is configured so that the support rod of the ladder body is hooked to the hook of the support bracket and hooked and locked at the desired height position The gist of the present invention is a mechanism for preventing biting of a hook to be attached.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
As shown in FIG. 5, the latching mechanism is mounted on the storage box d attached to the support rods of the lowermost first ladder a and the uppermost third ladder c of the above-described triple ladder constructed in a rectangular frame. As shown in FIG. 1, the hooking mechanism attached to the storage box is a box-shaped box 1 having an opening 1a on one side. When pressed in the direction of the opening 1a, the presser fitting 3 is elastically rotated in the direction of the arrow by the coil spring 5. 6 and 7 are set screws
Numeral 8 is a pivot screw of the support bracket. The support fitting 2 is provided with a U-shaped rotation preventing plate 11 for closing the opening 1a at the upper part of the box 1 so as to prevent the support fitting 2 from rotating upward and securely hook the support rod B of the ladder body on the support fitting. To stop. 12
Is a fixing screw for the rotation preventing plate 11.

As shown in FIG. 1, the support fitting 2 is pivotally attached to the upper part of the box by a pivot screw 8, is formed in an arc shape with its lower part opened, and has a hooking part 9 protruding downward on one side and an engaging part 9 on the other side. It is configured as a support fitting provided with a hook portion 13 of a bead-shaped ladder support rod, and is normally pushed in the direction of the box opening 1a by the elastic action of the leaf spring 4 attached to the box. On the other hand, the holding member 3 is attached to the lower part of the supporting member 2 and is formed as a metal member having a laterally elliptical shape. The coil spring 5 is wound around a screw 14 pivotally mounted on one side, and the holding member 3 is turned in the direction of the arrow. It is supported in a dynamic manner. Reference numeral 15 denotes an engaging projection provided on the support fitting so as to engage with the tip of the engaging portion 9 of the support fitting.

FIG. 3 is a perspective view of the support fitting 2. The engagement rotation between the support fitting 2 and the press fitting 3 is conventionally performed by forming the support fitting which engages with the press fitting 3 as a support fitting having the same thickness. The engaging portion of B was limited to the portion 13a in FIG. 3. However, since the side engaging surface of the engaging portion 9 was formed as an engaging portion 9a which was smoothly cut over the entire length, the supporting bracket and the holding member were held. Since the function of rotating the metal fitting is improved so that the latch mechanism does not protrude outside the box, the ladder body is effectively acted on up and down operation.

[0008]

As described above, according to the present invention, the engagement and rotation of the latch mechanism mounted in the box mounted on the support rod of the triple ladder is performed by the elastic force of the leaf spring. The ladder is raised and lowered, or the latching action on the support rod is performed quickly and even when the operator suddenly operates, the presser fitting 3 that engages with the support fitting is shortened to a minimum, and the engaging fitting pivotally engages with the support fitting. Since the protrusion 15 is provided to form a smooth engagement portion over the entire length of the lower side of the support bracket, and the engagement rotation with the holding bracket is enhanced, the function that does not hinder the vertical movement of the support rod of the ladder body is sufficient. Therefore, it is effective as a ladder body that achieves the quickness required for firefighting and emergency use.

[Brief description of the drawings]

1 is a partially cutaway overall view of a latching mechanism. FIG. 2 is an enlarged left side view of FIG. 1. FIG. 3 is a perspective view of a support bracket. FIG. 4 is a partially cutaway overall view showing the configuration of a triple ladder. FIG. 6 is a cross-sectional view showing the configuration of a conventional latch mechanism. FIG. 7 is an operation diagram of the latch mechanism of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Box 1a Opening 2 Support bracket 3 Holder 9 Engagement part 11 Rotation prevention plate 13 Engagement part 15 Engagement protrusion A Main rod B Supporting rod S Foot rail H Reinforcement rod a First ladder b Second Ladder c 3rd ladder

Claims (1)

[Claims] 1. A main rod and a supporting rod, each of which includes a higher-order supporting metal member which is rotated by urging a leaf spring or the like in a box and a lower holding member which is rotated by engaging with the supporting member. And it is composed of a horizontal rail and attached to a square connecting ladder to be connected or incorporated,
In the hanging mechanism of the triple ladder that moves up, down, or hooks to the desired height position by operating the wire and pulley, the supporting bracket of the hanging mechanism is formed in an arc shape with the lower part opened and one side left The ladder body support rod that extends to the right and the other side extends to the right. However, it is possible to move the triple ladder body by engaging the engaging portion of the support bracket and pressing the upper support bracket against the spring pressure of the leaf spring to rotationally press the latch mechanism in the box. At the time of downward movement, when the ladder body support rod is turned downward against the spring pressure of the leaf spring urged into the box, the ladder body descends and the ladder body is latched. Is characterized in that the support rod of the ladder body is engaged with the engaging portion of the support bracket and is engaged at a desired height position to be engaged with the ladder body. Only prevention mechanism.