JP3494486B2 - Clutch in storage door latch device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clutch for a latch device for a door of a storage or the like, and particularly when a high load is applied to the latch lever, the latch lever is operated. Also, since only the upper holding tube idles, the clutch portions at the ends of the upper and lower holding tubes are released, slipping occurs at the concave and convex curved portions, and they are separated from each other, so that there is no risk of damaging the latch mechanism. The present invention relates to a clutch in a door latch device. 2. Description of the Related Art In a conventional door locking device, an operating rod having a rectangular cross section is held in a square hole of a holding tube, a latch is fixed to an end of the operating rod, and the latch is returned. It is resilient by a spring and is engaged with the edge of the engaging hole formed in the frame plate of the cabinet body doorway, and a pull plate is provided in the pull cover, and the pull plate is pulled by a hook portion to connect the pull plate. There is a door locking device (see Japanese Utility Model Publication No. 2-6207) in which the operating rod pivots against a return spring via a plate to release the locking of the latch. Further, a handle cover is fixed to the back side of the door, which has been previously filed by the present applicant, and the handle cover has a square hole in the longitudinal direction, and the square hole has an operating rod having a square cross section. Through an engaging piece on the outer peripheral surface of the upper holding tube, projecting stop ribs on the outer peripheral surface of the lower holding tube, and vertically arranging these upper and lower holding tubes rotatably via operating rods. A handle plate having a handle opening and a handle plate portion is provided on the front surface of the door, and on the back surface of the handle plate portion,
With a pressing portion at the tip, the pressing piece presses the engaging piece of the upper holding tube, rotates the operating rod, and slidably releases the pressing block configured to release the latch provided at the end of the operating rod. Door locking device in a storage room provided (Japanese Utility Model Application No. 5-24972)
No.) exists. [0004] However, in the above two prior arts, when operating the latch lever,
When an excessive force is applied (when a high load is applied), the operating rod warps, causing bending. In addition, there is a problem that the engaging piece of the holding tube is damaged or bent. In view of these circumstances, the present invention divides a holding tube into upper and lower portions, forms a concave / convex curved portion so that each engaging end portion is symmetrical, and furthermore, forms a holding tube of a vertically divided holding tube. The present invention provides a clutch in a storage door latch device in which a notch portion and a projecting portion are formed diagonally with each other in a concave and convex curved portion of an engaging end portion so as to serve as a clutch mechanism. It is intended to do so. SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a clutch in a latch device for a door of a storage or the like, in which a pull cover is fixedly provided on the back side of the door. An operating rod is penetrated and held on the cover, and an upper holding pipe having an engaging piece protruding on the outer peripheral surface and a lower holding pipe having a stop rib protruding on the outer peripheral surface are vertically installed rotatably via the operating rod, At the lower end of the upper holding tube and the upper end of the lower holding tube, a concave and convex curved portion is formed symmetrically so as to be closely separated from each other by the rotation of the operating rod. A latch is provided, which is engaged with the edge of the latch engagement hole formed in the frame plate of the door of the storage main body, and is diagonally formed on the concave and convex curved portion of the engagement end of the upper and lower holding tubes. In this configuration, a clutch mechanism having a projecting portion and a cutout portion that engage with each other is provided. According to the present invention, as a result of adopting the above configuration, even when an excessive force is applied when operating the latch lever, the lower end of the upper holding tube and the lower end of the lower holding tube in the vertically divided holding tube can be used. The top and bottom of the holding tube are formed symmetrically with each other to form a concave and convex curved portion, and further, a notch and a projection are formed diagonally to the concave and convex curved portion of the upper and lower holding tubes. In the case of a load in a normal state, the clutch mechanism maintains the engaged state, and when a high load occurs, the engagement between the notch portion and the protrusion, which is the clutch mechanism, is released. Since the upper and lower holding tubes are separated from each other by guiding the concave and convex curved portions to the guides, the upper holding tube idles to prevent a load from being applied. Therefore, the latch function is sufficiently achieved without damaging the latch device. An embodiment of the present invention will be described below in detail with reference to the accompanying drawings. In FIG. 1, reference numeral 1 denotes a storage main body, and 2 and 2 'are double-opening doors. A pull cover 4 preferably made of synthetic resin is provided on the back side of the door surface 3 of the right door 2 at a bent portion 3 at the opening end of the front plate. '
And held between the door back 5 and attached. Reference numeral 6 denotes a latch, and 7 denotes a latch engagement hole. The clutch in the door latch device of the present invention will be described in detail with reference to FIGS. 2 to 4. The latch device 8 is provided on the back side of the door as can be understood from FIGS. I have. As shown in FIG. 3, the puller cover 4 has a rectangular hole 9a in the longitudinal direction, and an upper holding tube 10 made of synthetic resin having an engaging piece 12 projecting from the outer peripheral surface. The lower holding tube 15 formed with the concave and convex curved portion 23 at the lower end and the symmetrical concave and convex curved portion 23 at the upper end is combined,
The lower frame plates 18, 18 are respectively supported and vertically rotatably mounted. An operating rod 9 having a rectangular cross section is penetrated and held in the square hole 9a, and a latch 6 is fixed to upper and lower ends of the operating rod 9 (see FIG. 1). The latch 6 is engaged with the edge of a latch engaging hole 7 formed in the frame 17 of the door of the storage body 1 via a return spring 16, and a handle opening is formed on the front surface of the door 2. 2
5 and a latch lever 11 are provided, and by operating the latch lever 11, the latch lever protruding piece 13 is rotated, and the engaging piece 12 engaged with this is pressed to rotate the operating rod 9; It is slidably provided so as to release the latch 6 (see FIG. 3). The latch 6 is repelled by a return spring 16 wound around the upper and lower holding tubes 10 and 15, and is provided with latch engagement holes 7 and 7 formed in frame plates 17 above and below the doorway of the storage main body 1. Locked to the edge (see FIGS. 1 and 3). Further, the latch device 8 of the present invention will be described. An operating rod 9 having a latch 6 above or below, or up and down, and an upper holding tube 10 provided on the operating rod 9;
An engagement piece 12 is provided on the upper holding tube 10 so as to be rotated by a latch lever 11. A latch lever 11 is provided so as to be engaged with the operating portion of the puller cover 4. When the latch lever 11 is opened, a latch lever projection 13 for rotating the engagement piece 12 is moved. It is formed. The latch lever 11 is connected to the support shaft 1 supported by the puller cover 4.
4 is fixed. As described above, the latch 6 and the upper and lower holding tubes 1
The latch device 8 can be operated by the operating rod 9 provided with 0 and 15 and the support shaft 14 provided with the latch lever 5. Next, a specific embodiment of the present invention will be described with reference to FIGS. A handle cover 4 is provided at the rear end of the door 2, and a rectangular cross section having upper and lower holding tubes 10 and 15 inserted through holes 19 for operating rods 9 formed in the lower frame plate 18 above the handle cover 4. The operating rod 9 is penetrated and held, and return springs 16, 16 'are provided in a resilient state between the ends of the upper and lower holding tubes 10, 15 and the upper and lower frame plates 18. A stop rib 22 for stopping rotation by operating the operating piece 21 of the lock 20 is provided on the lower holding tube 15.
Is provided. Furthermore, the engagement ends which are the lower end and the upper end of the upper and lower holding tubes 10 and 15 are symmetrical concave and convex curved portions 23.
Are formed, and are tightly engaged to be in a close contact state (see FIG. 2). In the locked state, when the latching lever 12 is pressed and rotated by the latch lever projecting piece 13 with respect to the engaging piece 12 of the upper holding pipe 10, the lower holding pipe 15
Since the 0 operating piece 21 is in a stopped state in relation to the stop rib 22, it cannot be rotated. However, the lower holding tube 15 slides and moves downward while compressing the lower return spring 16 with the stop rib 22 and the operating rod 9 as guides. This can be gradually moved until the convex portions of the concave and convex curved portions 23 formed at the ends of the upper and lower holding tubes 10 and 15 are engaged with each other. Therefore, even if the latch lever 11 is operated by mistake during locking, there is no possibility that the latch mechanism will be damaged. The upper and lower holding tubes 10 and 15 are connected by a connecting portion 24 having a large diameter so that the lower end of the upper holding tube 10 covers the upper end of the lower holding tube 15 as shown, for example. Various configurations can be adopted. Since 20 is a known lock, detailed description is omitted. Since the clutch in the door latch device 8 has the structure as described above, if the latch lever 11 is pulled toward the front side with the finger inserted through the pull opening 25, the engagement piece is engaged with the latch lever projection 13. 12 is pressed, the upper and lower holding tubes 10 and 15 and thus the operating rod 9 rotate in a two-dot chain line state against the return spring 16, whereby the latch 6 rotates and the storage body 1 , The door 2 can be opened by pulling the latch lever 11 toward the user. Furthermore, when the finger is released from the latch lever 11, the spring is returned to the original position by the return spring 16. When the door 2 is to be closed, the inclined rear surface 26 of the latch 6 engages with the edge of the latch engagement hole 7 by simply rotating the door 2 inward, and the latch 6 resists the return spring 16. Then, it is rotated to pass through the inside of the latch engagement hole 7, and after the passage, it is returned by the return spring 16 and locked again at the edge of the latch engagement hole 7 (see FIG. 3). Further, the operation piece 21 is rotated by the lock 20 to prevent the operation rod 9 from rotating through the lower holding tube 15, and the door 2 is in the same state as the locked state. The latch 6 may be provided only on one of the upper and lower sides of the door 2 depending on the size of the storage. Next, the operation will be briefly described. As described above, a little explanation was given in the explanation of the configuration, but FIGS.
The embodiment will be described in detail with reference to FIG. 3. First, when the door is closed, each member is positioned as shown by a solid line. The latch 6 is rotated in a direction perpendicular to the surface of the door, and is engaged and latched in a latch engagement hole 7 in a main body such as a storage. The state in which the latch 6 is locked means that the engaging piece 12 of the upper holding tube 10 provided on the operating rod 9 fixing the latch 6 is parallel to the door surface. Moreover, the upper return spring 16 constantly urges the latch lever projection 13 of the latch lever 11 so that the latch lever projection 13 is positioned in a state of being overlapped so as to be parallel to the engagement piece 12. When opening the door from the closed state of the door,
When the latch lever 11 is rotated against the return spring 16 as shown by a two-dot chain line, the latch lever projection 13 pushes the engagement piece 12 while the latch lever projection 13 and the rotation direction are opposite to each other. , The latch 6 is moved to 2
The door can be rotated to the position indicated by the dashed line, retracted from the latch engagement hole 7, and the door can be opened. After the door is opened, when the user releases the latch lever 11, the return spring 16 returns the latch 6 and the latch lever 11 to their normal positions (positions indicated by solid lines). Thereafter, when the door is closed, the arc portion of the latch 6 collides with the non-engaging portion of the engaging hole formed in the storage main body 1, and once against the return spring 16, a two-dot chain line is formed. Rotate to the position side. Further, when the door is pushed, the latch engagement hole 7 is pressed.
And returned to the solid line position by the return spring 16 and locked. Further, as can be understood from FIG. 4, an uneven curved portion 23 is formed so that each of the divided upper and lower holding tubes 10 and 15 has a symmetrical engagement end portion. The protrusion 27 is formed diagonally on the concave / convex curved portion 23 of the portion, for example, at two places, and the projection 27 is formed on the upper holding tube 10 and the notch 28 is formed on the lower holding tube 15 so as to have a clutch function. It was made. However, in the case of the conventional clutch portion having only the concave / convex curve portion 23, the latch 6 is not used during actual normal use.
When the load is applied to the upper and lower holding pipes 10 and 15 due to interference with the latch engagement hole 7 where the latch is engaged, and the load is applied to the upper and lower holding tubes 10 and 15, the clutch part idles in the same manner as when the key is locked. There is a possibility. In order to solve this problem, the present invention provides a low load by providing a protrusion 27 and a notch 28 as a clutch on the concave / convex curve portion 23 at the engagement end of the upper and lower holding tubes 10 and 15. In the case (1), the latch 6 can be operated reliably (can be set by the size of the protruding portion and the notch portion), and only when the load is high, the clutch portion of the concave / convex curve portion 23 idles and the operation of the latch 6 stops. Is done. According to the present invention, the following effects can be obtained based on the above configuration. (1) In the case of a low load, the latch can be operated reliably, and only in the case of a high load, the clutch can idle and stop the operation of the latch.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an external perspective view of a storage showing an embodiment of the present invention. FIG. 2 is a sectional view showing a main part of the latch device of the present invention. FIG. 3 is a partially sectional front view showing a pull portion of the present invention. FIG. 4 is an enlarged sectional view showing an engagement end portion of the upper and lower holding tubes of the present invention. [Description of reference numerals] 1 {Storage room main unit 2, 2 '} Double door 3 {Door surface 4} Pull cover 5} Door back surface 6 {Latch 7} Latch engagement hole 8} Latch device 9 operating rod 10 upper holding tube 11 latch lever 12 engagement piece 13 latch lever protrusion 14 support shaft 15 lower holding tube 16 return spring 17 frame Plate 18 ‥‥ above,
Lower frame plate 19 hole 20 lock 21 operating piece 22 stop rib 23 concave / convex curved part 24 connecting part 25 handle opening 26 inclined back 27 protruding part 28 ‥ Notch

──────────────────────────────────────────────────続 き Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) A47B 88/00 E05C 9/08 E05B 3/00 E05B 65/02

Claims (1)

(57) [Claims 1] A pull cover 4 is fixedly mounted on the back side of the door 2,
The operating rod 9 is passed through and held by the puller cover 4, and the upper holding tube 10 having the engaging piece 12 protruding on the outer peripheral surface and the lower holding tube 15 having the stop rib 22 protruding on the outer peripheral surface are rotatably operated. It is installed vertically via a rod 9, and the lower end of the upper holding tube 10 and the lower holding tube 15
A concave / convex curve portion 23 is formed symmetrically at the upper end of the operating rod 9 so as to come into close contact with the rotation of the operating rod 9, and a latch 6 springed by a return spring 16 is provided at an end of the operating rod 9. The upper and lower holding tubes 10 and 15 are diagonally opposed to the concave / convex curved portion 23 at the engaging ends of the latch engaging holes 7 formed in the frame plate 17 of the door of the storage main body. A clutch in a storage door latch device, characterized in that a clutch mechanism having a projecting portion 27 and a cutout portion 28 that engage with each other is provided.