JP4871639B2 - Latch device and fire extinguisher storage box - Google Patents

Description

  The present invention relates to a latch device and a fire extinguisher storage box including the same.

  Conventionally, as shown in FIGS. 8 to 13, for example, a door latch device for a fire extinguisher storage box is known. 8 is a plan view of the latch device, FIG. 9 is a front view of the latch device, FIG. 10 is a side view of the latch device, FIG. 11 is a rear view of the latch device, and FIG. 13 and 13 are perspective views of the latch of the latch device. In each of the drawings, this latch device is known to have a front 31 attached to a door 29 and having a latch retracting hole 30, and a latch 32 having a triangular section made of sheet metal. The latch 32 includes two slope plates 33 and 34 that meet at an acute angle, triangular end face plates 35 and 36 that are connected to the upper and lower ends of the slope plates 33 and 34, and the slope plates 33 and 34, respectively. 34, and retaining shafts 37 and 38 projecting from the upper and lower sides of the rear end of the spring 34. A spring support shaft 39 is installed between the rear ends of the inclined plates 33 and 34 so as to be orthogonal to the inclined plates 33 and 34. The cylindrical portion 40a of the torsion coil spring 40 is inserted through the spring support shaft 39. Thus, the latch 32 fits in a retaining manner through the retaining shafts 37 and 38 that can be brought into and out of the latch retracting hole 30 of the front 31 and abutted and engaged with the rear side of the hole edge of the latch retracting hole 30. The end portions of the arms 40b and 40c that are mounted together and extend from both ends of the cylindrical portion 40a of the torsion coil spring 40 toward the rear of the both end face plates 35 and 36 of the latch 32 are opposed to the rear of the front 31. Is engaged with a pair of spring receivers 41, 42 projecting from.

  At that time, the latch 32 is always urged in the protruding direction by the torsion coil spring 40 and is attached to the front opening frame 43 side of the fire extinguisher storage box body into which the door 29 is fitted, as shown in FIGS. The door 29 is held in a closed state with respect to the front opening frame 43. Now, when the door 29 is pulled and opened in the direction of arrow C shown in FIG. 8, one slope plate 33 of the latch 32 comes into contact with the receiving seat 44 side, and the latch 32 is twisted by the component of the retracting force of the door 29. Rotating with the retaining shafts 37, 37 of one of the slope plates 33 against the spring force of the spring 40 and turning it into the latching hole 30 so that the door can be opened. To. When the door 29 is pushed and closed in the direction of arrow D shown in FIG. 8, the other slope plate 34 of the latch 32 comes into contact with the receiving seat 44 side, and the latch 32 is temporarily brought into contact with the other slope plate by the component of the pushing force of the door. Rotating in the direction opposite to the rotation direction with the shafts 38 and 39 for retaining and holding 34 of the shaft 34 as the rotation center axis, it is immersed in the latch retracting hole 30, and at the same time it matches the recess 45 of the receiving seat 44. It protrudes from the intrusion hole 30 and engages with the recess 45.

The latch 32 of the latch device is provided with triangular end face plates 35, 36 integrally connected to both ends of the two slope plates 33, 34 in order to maintain and reinforce the slope angle of the two slope plates 33, 34. However, the respective rear end edges 35a, 36a of the both end face plates 35, 36 are for avoiding interference with the arms 40b, 40c of the torsion coil spring 40 when the latch 32 is inserted into the latch retracting hole 30. As shown in FIG. 12, it is formed so as to float slightly from the front surface 31a or to a length that is flush with the front surface 31a of the front 31.
However, in such a length configuration of both end face plates 35 and 36, when the slope plates 33 and 34 of the latch 32 are pressed from the one end face plate 35 over the entire length of the other end face plate 36 with a uniform force, the latch 32 is Although there is no problem in immersing the latch in / out hole 30, there is a case where it is biased strongly toward one end face plate 35 side or the other end face plate 36 side. In such a case, it is not pushed strongly as shown in FIG. The rear end edge 35a of the one end face plate 35 on the side or the rear end edge 36a of the other end face plate 36 is brought close to the front face 31a of the front 31 and is held on the front face 31a, thereby making the immersion operation impossible. Therefore, there has been a problem that the door 29 cannot be opened. In particular, in the case of the door 29 of the fire extinguisher storage box, there arises a problem that it is not in time when it is necessary to open it urgently.

The present invention has been made in order to solve such a problem, and an object of the present invention is to provide a latch having a triangular section as described above, and to urge the latch in a protruding direction by a torsion coil spring. In such a latch device, a latch device capable of always guaranteeing a stable and reliable immersion operation without fear of disabling the immersion operation of the latch as described above by devising the structure of the both end face plates of the latch is provided. It is in.
It is another object of the present invention to provide a fire extinguisher storage box that can always be opened without causing a situation in which the immersion operation of the latch is disabled as described above.

  The latch device according to the present invention will be described with reference to the reference numerals attached to FIGS. 1 to 5 for easy understanding of the contents of the invention. And a latch 9 having a triangular cross section. The latch 9 has two inclined plates 14 and 15 whose tips meet at an acute angle, and a triangular shape connected to both ends of the two inclined plates 14 and 15, respectively. The end plates 16 and 17, the retaining shafts 18 and 19 projecting from the rear ends of the slope plates 14 and 15, and the slope plates 14 and 15 are orthogonal to the rear ends of the slope plates 14 and 15. And a torsion coil spring 20 having a cylindrical portion 20a inserted through the spring support shaft 21. The latch 9 can be moved into and out of the latch retracting hole 11, and Anti-retention shaft 1 that contacts and engages the rear side of the hole edge , 19 are fitted and mounted in a retaining shape, and extend from the both ends of the cylindrical portion 20a of the torsion coil spring 20 toward the rear of the both end face plates 16 and 17 of the latch 9, and the ends of the arms 20b and 20c. In the latch device in which the latch 9 is engaged with a pair of spring receivers 12 and 13 projecting oppositely to the rear of the front 8 and the latch 9 is projected and urged by a torsion coil spring 20, both end plates of the latch 9 16 and 17 are provided with extended end face plates 16a and 17a extending to a length protruding rearward from the latch retracting hole 11 of the front 8 in the protruding state of the latch 9, and the extended end face plates 16a and 17a. Further, it is characterized in that notches 22 and 23 for avoiding interference with the arms 20b and 20c of the torsion coil spring 20 are provided.

  As described in claim 2, the fire extinguisher storage box of the present invention is provided with the latch device 1 according to claim 1 on a door 6 attached to the front opening frame 4 of the storage box body 3 so as to be openable and closable. It has the characteristics.

  According to the latch device of the present invention, the extended end face plate extending to the length protruding rearward from the front latch retracting hole in the protruding state of the latch is provided at each rear end of the both end face plates of the latch. Can be stably raised and retracted with respect to the latching and retracting hole under the guiding action of the extended end face plate. Therefore, even if there is a situation where the latch is pushed strongly toward one end face plate or the other end face plate at the time of immersion, the latch is smoothly and smoothly inserted into the latch retracting hole under the guiding action of the extended end face plate. In order to be surely immersed, the problem that the rear end edge of one end face plate or the rear end edge of the other end face plate can be held on the front face of the front as shown in FIG. 14 can be solved. Further, since the notch is provided in the extension end face plate, it is possible to avoid the extension end face plate from interfering with the arm of the torsion coil spring when the latch is immersed.

  According to the fire extinguisher storage box of the present invention, as the door is opened, the latch can be smoothly and surely inserted into the latch in / out hole under the guiding action of the extension end plate as described above. This is advantageous because it can prevent accidents and respond well in an emergency.

  A preferred embodiment of the present invention will be described with reference to the drawings. 1 is a plan view of a latch device according to an embodiment of the present invention, FIG. 2 is a front view of the latch device, FIG. 3 is a side view of the latch device, FIG. 4 is a rear view of the latch device, and FIG. 2 is a sectional view taken along line AA in FIG. 2, FIG. 6 is a perspective view of the latch of the latch device, and FIG. 7 is a front view of a fire extinguisher storage box to which the latch device is attached.

  As shown in FIG. 7, for example, the latch device 1 according to the present invention is attached to a door 6 that is attached to a front opening frame 4 of a storage box body 3 of a fire extinguisher storage box 2 by a hinge 5 so as to be opened and closed. 1 to 6, the latch device 1 includes a front 8 attached to the side of the door 6 on which the handle 7 is attached, and a sheet metal cross section, as in the case of the conventional latch device shown in FIGS. 8 to 13. And a triangular latch 9. As shown in FIG. 7, a receiving seat 10 is attached to the front opening frame 4 side so as to correspond to the latch 9.

  As shown in FIG. 5, the front 8 opens a rectangular latching / retracting hole 11, and spring receivers 12, 13 project rearwardly from a pair of opening edges facing the top and bottom of the latching / recessing hole 11. ing.

  As shown in FIG. 6, the latch 9 includes two slope plates 14 and 15 whose tips meet at an acute angle, and triangular end face plates 16 connected to the top and bottom ends of the slope plates 14 and 15, respectively. 17 and the shafts 18 and 19 for retaining and projecting above and below the rear ends of the slope plates 14 and 15 are formed in a triangular cross section. As shown in FIGS. 4 and 5, between the rear ends of the slope plates 14, 15, both ends of the spring support shaft 21 inserted through the cylindrical portion 20 a of the torsion coil spring 20 are located behind the slope plates 14, 15. The spring support shaft 21 is constructed so as to be orthogonal to the slope plates 14 and 15 by being engaged and fixed to the notches 14a and 15a provided in the center of the ends.

  Thus, as shown in FIGS. 4 and 5, the latch 9 is fitted and mounted in the latch protrusion / retraction hole 11 of the front 8 so as to be able to protrude and retract, and the both ends of the latch 9 from both ends of the cylindrical portion 20 a of the torsion coil spring 20. The ends of the arms 20b and 20c extending toward the rear of the face plates 16 and 17 are inserted into and engaged with the holes 12a and 13a of the spring receivers 12 and 13, respectively. As a result, the latch 9 receives a torsional moment acting around the axis of the torsion coil spring 20 and is always biased in the protruding direction. The latch 9 urged in the protruding direction is prevented from being removed from the latch retracting hole 11 when the retaining shafts 18 and 19 are in contact with the rear sides of the upper and lower hole edges of the latch retracting hole 11. Fitted to the state.

  In the latch device 1 configured as described above, as shown in FIGS. 5 and 6, according to the present invention, the front end 8 of the latch 9 protrudes from the rear ends of both end plates 16 and 17 of the latch 9. Extending end plates 16a and 17a extending to the length protruding rearward from the latching / retracting hole 11 are integrally provided, and the arms 20b and 20c of the torsion coil spring 20 are provided near the centers of the extended end plates 16a and 17a. It is characterized by providing the notches 22 and 23 for avoiding interference.

  Next, the operation of the latch device 1 configured as described above will be described with reference to FIGS.

As shown in FIG. 1 and FIG. 5, the latch 9 is engaged with the recess 10 a of the receiving seat 10 on the front opening frame 4 side of the storage box body 3 in a protruding state, whereby the door 6 is opposed to the front opening frame 4. It is held closed.
In this closed state, when holding the handle 7 and pulling the door 6 in the direction of arrow C shown in FIG. 1, one inclined plate 14 of the latch 9 comes into contact with the receiving seat 10, and the retracting force of the door 6 is reduced. When the latch 9 is rotated by the component force with the shafts 18, 18 for retaining and holding the one slope plate 14 as the rotation center axis, the latch 9 can be immersed in the latch retracting hole 11 and the door 6 can be opened.
When the door 6 is pushed and closed in the direction of arrow D shown in FIG. 1 from the open state, the other inclined plate 15 of the latch 9 comes into contact with the receiving seat 10 side, and the latch 9 is moved by the component force of the pushing force of the door 6. Once it is pivoted in the direction opposite to the pivoting direction with the shafts 19 and 19 for retaining the other slope plate 15 as the pivot center axis, the latching recess 11a of the receiving seat 10 is recessed. At the same time, it protrudes from the latch in / out hole 11 and engages with the recess 10a to keep the door closed.

  When such a latch 9 is projected and retracted into the latch retracting hole 11, the length of the rear end of each end plate 16, 17 of the latch 9 projecting rearward from the latch retracting hole 11 of the front 8 in the projecting state of the latch 9. Since the extended end face plates 16a and 17a are provided so as to extend to the latch 9, the latch 9 can stably enter and exit the latch in / out hole 11 under the guiding action of the extended end face plates 16a and 17a. Therefore, even if a situation occurs in which the latch 9 is biased strongly toward the one end face plate 16 side or the other end face plate 17 side during the immersion operation, one end face plate 35 as shown in FIG. The latch 9 is latched under the guiding action of the extended end plates 16a and 17a without causing a problem that the rear end edge 35a of the rear end plate 35a or the rear end edge 36a of the other end plate 36 can be held on the front surface 31a of the front 31. The door 6 can be opened by smoothly and reliably immersing into the intrusion hole 11. Further, since the extension end plates 16a and 17a are provided with the notches 22 and 23, it is possible to avoid the extension end plate 16a and 17a from interfering with the arms 20b and 20c of the torsion coil spring 20 when the latch 9 is retracted. .

  Although the latch device 1 is extremely useful when used in the door 6 of the fire extinguisher storage box 2, it can also be used in other various doors or opening / closing members of opening / closing devices.

It is a top view of the latch apparatus which shows one Example of this invention. It is a front view of the latch device. It is a side view of the latch device. It is a rear view of the same latch device. It is the sectional view on the AA line in FIG. It is a perspective view of the latch of the latch device. It is a front view of the fire extinguisher storage box which attached the latch apparatus. It is a top view of the latch apparatus of a prior art example. It is a front view of the latch apparatus of FIG. FIG. 9 is a side view of the latch device of FIG. 8. FIG. 9 is a rear view of the latch device of FIG. 8. FIG. 10 is a sectional view taken along line BB in FIG. 9. It is a perspective view of the latch of the latch device of FIG. It is sectional drawing which shows the malfunctioning state of the latch apparatus of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Latch device 2 Fire extinguisher storage box 3 Storage box main body 4 Front opening frame 6 Door 7 Handle 8 Front 9 Latch 10 Receiving seat 11 Latch retracting hole 12, 13 Spring support 14, 15 Slope plate 16, 17 End plate 16a, 17a Extension End face plates 18, 19 Anti-shaft shaft 20 Torsion coil spring 20a Cylindrical portion 20b, 20c Arm 21 Spring support shaft 22, 23 Notch

Claims (2)

The latch has a front and rear latch hole, and a triangular cross-section latch. The latch has two slope plates whose tips meet at an acute angle, and a triangular shape that is connected to both ends of the two slope plates. An end face plate, a retaining shaft portion projecting from the rear end of each slope plate, a spring support shaft extending perpendicularly to the slope plate between the rear ends of the two slope plates, and the spring support shaft And a torsion coil spring having a cylindrical portion inserted through the latch, the latch being able to project and retract into the latch retracting hole, and abutting and engaging the rear side of the hole edge of the latch retracting hole. Each end of the arm that is fitted and mounted in a retaining shape through the shaft and extends from both ends of the cylindrical portion of the torsion coil spring toward the rear of both end plates of the latch is to the rear of the front The latch is engaged with a pair of spring supports projecting in opposition to each other. In the latch device being projected biased in serial torsion coil spring,
At each rear end of the both end face plates of the latch, an extended end face plate extending to a length protruding rearward from the front latch retracting hole in the protruding state of the latch is provided, and the torsion coil spring is provided on the extended end face plate. A latch device comprising a notch for avoiding interference with the arm. A fire extinguisher storage box comprising the latch device according to claim 1 provided on a door attached to the front opening of the storage box main body so as to be opened and closed.

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