JP2710101B2 - latch - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a latch,
In particular, but not limited to this, when used on a hinged door without a handle, the door is locked in the closed state, and when opening the door, once the door is pushed in and released, the door is closed. The present invention relates to a floating latch that can be slightly pushed open in a door opening direction. 2. Description of the Related Art The applicant of the present invention has disclosed a Japanese Utility Model Application No. 57-44631 (Japanese Utility Model Application Publication No. Sho 58-148160) in which a fixed cylinder, a rod, a cam claw rotatably mounted on the rod, and a fixed The present invention proposes a floating type latch that has a very small number of four parts of a coil spring, which is compressed when a door is closed between a cylinder and a rod and accumulates an urging force for pushing the rod from a fixed cylinder when the door is opened. In this conventional latch, a crotch-shaped clip for elastically holding a strike attached to the back of the door is provided at the end of the rod. When the door is closed, the clip holds the strike of the door. Prevent the door from opening. Also,
A long groove in the longitudinal direction is provided at a rear portion of the rod that slides back and forth in the fixed cylinder, a tongue having a projection at a free end is provided on a part of the cylinder wall, and the projection is engaged with the long groove of the rod. By combining them, the sliding of the rod is guided, and the rod is prevented from falling out of the fixed cylinder. [0004] In the above-mentioned conventional latch, since the tongue piece has flexibility, it is easy to assemble the rod by inserting it into the inside of the fixed cylinder. When a force is applied to pull the door striker out of the crotch clip at the end of the rod to open it, the end of the long groove of the rod pushes the projection and flexes the tongue, causing the rod to move out of the fixed cylinder. May be missed. Also, since the cross-sectional shape of one end of the rod is substantially the same as the opening of the fixed cylinder, it is difficult to position the rod when inserting the rod into the opening of the fixed cylinder, and the rod is inserted into the opening of the fixed cylinder. If the end of the rod and the edge of the opening are slightly abutted and touched, the rod cannot be inserted into the opening of the fixed cylinder. In particular, in this type of latch,
Since the assembly is performed at a high speed or set by an automatic machine, once the end of the rod and the edge of the opening are caught, the assembly cannot be performed. Further, a coil spring that pushes the rod forward is wound around the rod itself, and the rear end of the coil spring is received by the flange at the front end of the fixed cylinder. It is necessary to provide a flange to catch the front end, the rear part of the rod is pushed deep into the fixed cylinder, and the rod extends long from the front end of the fixed cylinder even when the door is closed, and the length of the latch in the front-rear direction Becomes significantly longer. Therefore, the latch can be fixed only to the main body having a long space in the front-rear direction, and the usable range of the latch is limited. SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and includes a fixing cylinder fixed to a main body having a hinged door, and a door which is closed. In a push-push type latch having a rod which is pushed into the fixed cylinder against a biasing force of a coil spring by a strike behind the door and holds the strike to keep the door closed, Synthetic tree with tube (1)
A long hole (1 ') in the front-rear direction is formed by integrally molding with a fat, and the rod (2) is directed forward to the rear half of the rod (2) sliding in the front-rear direction in the fixed cylinder (1). And a receiving portion (5) for receiving the coil spring (4), which is pressed into the housing, is engaged with an end of the elongated hole (1 ') so that the rod (2) comes off from the fixed cylinder (1). And a stopper (6) that is guided by the elongated hole (1 ') in the front-rear direction of the fixed cylinder (1) is erected, and the upper end of the stopper (6) descends obliquely rearward. When the cam member (3) is placed on the rod (2) and the rod (2) is pushed into the fixed cylinder (1), the cam member (3) is activated to be in a locked state. The rod (2) is locked in the fixed cylinder (1), and the rod (2) is fixed again. (1) when pushed into the cam means for releasing the locking of the rod (2) What to be unlocked by actuating (3,10,1
1) is provided. An embodiment of the present invention will be described below with reference to the drawings. In the figure, 1 is a fixed cylinder having a closed rear end and an open front end, 2 is a rod, 3 is a cam claw rotatably mounted on the rod 2, and 4 is a compression between the fixed cylinder 1 and the rod 2. The coil spring 4 is shown.
The others are plastic molded products. The rod 2 has an opening 5 in the rear half thereof, which functions as an accommodating portion for accommodating a coil spring 4 opened on the lower surface and the rear surface. The coil spring 4 pushes the rod 2 forward into the opening 5. One-third to two-thirds from one end in the extended state are accommodated. Therefore, when the rod is pushed into the fixed cylinder 1 by closing the door, the coil spring 4 is compressed between the rear wall of the fixed cylinder 1 and the front wall 5 ′ of the opening 5, and when the door is next opened. Store the power of. As described above, since one third to two thirds of the coil spring 4 is accommodated so as to be received in the open portion 5 provided in the rear half of the rod 2, only the stiffness of the coil spring 4 is ensured. In addition, the length of the product can be reduced, and the size of the product can be reduced. The upper surface of the rear half of the rod 2 has a stopper 6 pivotally mounted with the cam pawl 3 at the rear and having a slope 6 'descending obliquely backward at the upper rear end. The length between both ends of the cam pawl 3 is almost equal to the width of the rear half of the rod 2, and each end of the cam pawl 3 has a V-shaped notch 7 and one of the rounded strokes of the shoulder. The corner 8 has a rotational symmetry, and the other corner 9 is sharp because the notch 7 meets the side surface of the nail. In addition, the fixed cylinder 1 is a first projection which is engaged with the notch 7 at one end of the cam pawl 3 when the rod 2 is pushed most, and rotates the cam pawl 3 by a small amount. Claw 10, the second projection claw 1 on the other inner wall slightly away from the back
One. Next, a typical example of assembling a latch will be described. First, the coil spring 4 is inserted into the raised portion provided in the fixed cylinder 1, and the cam pawl 3 is rotatably mounted on the rod 2. Then, the end of the rod 2 opposite to the holding piece 13 is made to face the opening of the fixed cylinder 1. In this case, the end section of the rod 2 is set to be relatively smaller than the opening of the fixed cylinder 1, so that the rod 2 can be smoothly inserted. Next, shortly after the rod 2 is inserted into the opening of the fixed cylinder 1, the upper edge of the opening of the fixed cylinder 1 and the stopper 6 of the rod 2 abut. At this time, since the stopper 6 has the slope 6 ', a slight force is applied to the rod 2 to fix the rod 2 to the fixed cylinder 1.
By pushing it into the inside, the slope 6 'lifts the front end 1a of the upper wall of the fixed cylinder 1 from below and slips under it, and the stopper 6 smoothly passes over the upper edge of the opening and engages with the elongated hole 1'. As shown in FIG. 2, the fixed cylinder 1 and the rod 2 can be easily assembled, and the stopper 6 engages with the longitudinal hole 1 ′ provided on the upper wall of the fixed cylinder 1, and Guides and regulates forward and backward sliding. When the assembly is completed, it is possible to visually or audibly recognize that the stopper 6 protrudes into the elongated hole 1 'and engages with the end of the elongated hole 1', so that the completion of the assembly can be easily confirmed. be able to. Further, when the rod 2 is pulled forward and a force is applied to pull the rod 2 out of the fixed cylinder 1, the stopper 6
Abuts against the front end of the elongated hole 1 ′ and resists, so that the rod 2 can be reliably prevented from falling out of the fixed cylinder 1. Next, the operation will be described. The operation of the cam pawl 3 and the two protruding pawls 10 and 11 is exactly the same as that of the prior proposal. When the door is pushed a little past the closing position and the rod 2 is pushed deepest into the fixed cylinder 1 against the coil spring 4. Then, the cam pawl 3 is slightly rotated by the first protruding pawl 10 (FIG. 4). If you stop pushing the door in this state, the coil spring 4
The rod 2 is pushed out a little by the restoring force, and the door moves a little in the opening direction.
a engages with the second protruding claw 11 in the middle, the cam claw 3 further rotates, the sharp corner 9 is caught on the inner wall on one side of the fixed cylinder 1, and the cam claw 3 is moved about 45 in the fixed cylinder 1. The rod 2 stays in the rotated state and the rod 2 is not pushed out any further,
Locked against. At this position, the door is just closed (FIG. 5). Next, when the door is pushed again to open the door,
The rod 2 is pushed again to the back, and the cam claw 3 is stroked to engage the first projection claw 10 at the corner 8 of the shoulder, and is further rotated by about 45 ° so as to be in a direction substantially orthogonal to the rod 2 (FIG. 6). . Then, when the pressing is stopped, the rod 2 is pushed out by the restoring force of the coil spring 4, and the cam pawl 3 is stroked and engaged with the second protruding pawl 11 at the shoulder corner 8, and is further rotated by 90 ° to be aligned with the rod 2. The rod 2 is pushed out (FIG. 8) until the stopper 6 comes into contact with the front end of the elongated hole 1 '(FIG. 8), and the door is slightly opened. When the door is closed, the rod enters the fixed cylinder 1, and when the door is opened, the front half of the rod 2 that comes out of the fixed cylinder 1 has a pair of holding pieces connected to the rear half via a thin hinge 12. 13 and 13. This pair of holding pieces 1
3 and 13 are formed in an inverted C-shape that opens diagonally outward, and the inner surface 15 of the base of each holding piece 13 on the hinge 12 side and the inside of the fixed cylinder 1 for each holding piece 13 to hold the strike 14. A protruding portion 17 is provided on one or both of the rear end portion 16 and the front end surface 16 of the rod 2 facing the base inner surface 15 when immersed (FIGS. 9 and 10). Therefore, according to the present invention, when the push is performed to close the door, the strike 14 comes into contact with the front end face 16 of the rear half of the rod 2 and pushes the rod 2 into the interior of the fixed cylinder 1. A pair of holding pieces 13 in the first half,
Reference numeral 13 denotes a sliding contact with the rim of the fixed cylinder 1 in order to enter the fixed cylinder 1, flexes the hinges 12 to bend inward, respectively, the base inner surface 15 on the hinge 12 side, and the front end face 16 of the rear half of the rod 2. The projections 17 on one or both of them abut and deform, and in this state, pinch the tip of the strike 14 (FIG. 3). In this case, each holding piece 13 has a strike 1
4 is provided with a thickened portion 13 'slightly behind the tip, a strike 14 is provided with a constricted recess slightly behind the tip, and the thickened portion 13' enters the recess to sandwich the strike 14. , An enlarged portion 14 'is provided at the tip of the strike 14, and the thickened portion 13' is
It is preferable that the strike 14 be sandwiched behind the 4 'so that the sandwiched strike 14 does not come off. Then, in order to open the door, a pair of holding pieces 1
When the fixed members 3 and 13 move out of the front end of the fixed cylinder 1, the elastic restoring force of the hinge 12 bent inward and the deformed protrusion 17
And a pair of holding pieces 13
Opens the strike 14 outward and opens the strike 14, so that it is not necessary to pull the door strongly in order to escape the strike 14 from the clip as in the past, and the door can be opened without difficulty. In addition, there is no possibility that the stopper 6 may break down, and the projection 17 also functions as a stopper for preventing the holding pieces 13, 13 from being excessively bent inward and breaking from the hinge 12. In this embodiment, the cabinet body,
Alternatively, when the door is the door of the tuner adjustment unit of the television, the fixed cylinder 1 can be easily attached to the television main body. That is, the front end 1a of the fixed cylinder 1
The left and right side walls are provided with a U-shaped notch, and a tongue piece 1b having a free end protruding outward is provided. The distance between the free end of the tongue piece 1b and the rear surface of the front end 1a is set to It is matched to the plate thickness. Accordingly, as shown in FIG. 3, an opening having the same shape as the contour of the rear portion of the fixed cylinder 1 is opened in the main body 19,
When the fixed cylinder 1 is pushed into the opening from the rear end, the tongue piece 1b
Since the main body 19 is sandwiched between the free end of the front end 1a and the rear surface of the front end 1a, it can be easily attached. Then, the cam pawl 3 as a cam member of the cam means is rotated.
It may be configured to move by being pushed in. As described above, according to the present invention, the stopper 6 stands on the upper surface of the rear half of the rod 2, but the upper rear end of the stopper 6 is formed on the slope 6 'descending obliquely backward. Therefore, by slightly applying a force to push the rod 2 into the fixed cylinder 1, the inclined surface 6 ′ lifts the front end of the upper wall of the fixed cylinder 1 from below and slips under it, and Since it engages with the long hole 1 'of the upper wall , the fixed cylinder 1 and the rod 2 can be easily connected.
Can be assembled . Since the stopper 6 of the rod 2 is guided by the elongated hole 1 ′, the shape of the end surface of the rod 2 can be smaller than the opening of the fixed cylinder 1. Therefore, the fixed cylinder 1 and the rod 2 can be easily assembled by an automatic machine. When the assembly is completed, it is possible to visually or audibly recognize that the stopper 6 protrudes into the elongated hole 1 'and engages with the end of the elongated hole 1', so that the completion of the assembly can be easily confirmed. be able to. Further, when a force for pulling the rod 2 forward and pulling it out of the fixed cylinder 1 is applied, the stopper 6
Abuts against the front end of the elongated hole 1 ′ and resists, so that the rod 2 can be reliably prevented from falling out of the fixed cylinder 1. Since the coil spring 4 for pushing the rod 2 forward is accommodated in the accommodating portion (5) provided in the rear half of the rod 2, the operation is assured by eliminating only the stiffness of the coil spring 4. In addition, the length of the product can be shortened, and the product can be reduced in size. In particular, when used for a cover of a TV operation button or a cover of a compact disc player, a portion having a small depth space, etc. A very advantageous latch can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of a latch. FIG. 2 is a vertical sectional side view of a latch. FIG. 3 is an explanatory view showing a state in which a strike pushes a rod into a fixed cylinder. FIG. 4 is an explanatory view of a state where the rod is pushed in until it comes into contact with the inside of the fixed cylinder. FIG. 5 is an explanatory view of a state in which a rod holds a strike. FIG. 6 is an explanatory view of a state in which the rod is pushed again to release the holding of the strike. FIG. 7 is an explanatory diagram of a state where a rod is pushed out. FIG. 8 is an explanatory view of a state in which a rod has released a strike. FIG. 9 is a partial plan view of another example of the rod in a strike released state. FIG. 10 is a plan view of a part of the rod of FIG. 9 in a strike holding state. [Description of Signs] 1 Fixed cylinder 1a Front end 1b Tongue piece 1c Positioning part 1 'Slot 2 Rod 3 Cam claw 4 Coil spring 5 Opening part 5' Front wall 6 Stopper 6 'Slope 7 Notch 7a One side 8, 9 corner DESCRIPTION OF SYMBOLS 10 First projection claw 11 Second projection claw 12 Hinge 13 Retaining piece 13 'Thickening part 14 Strike 14' Enlarged part 15 Base inner surface 16 Front end surface 17 Projection 19 Main body

Claims (1)

(57) [Claims] A fixed cylinder fixed to the main body with the door hinged thereto, and the strike behind the door is pushed into the fixed cylinder against the urging force of the coil spring by closing the door, holding the strike and holding the strike. In a push-push type latch having a rod for keeping a door closed, said fixed cylinder (1) is integrally formed of synthetic resin to open a longitudinal hole (1 ') in the front-rear direction, and said fixed cylinder (1) is provided. In the latter half of the rod (2) that slides in the front-rear direction within the parentheses), a housing part (5) for receiving the coil spring (4) that pushes the rod (2) forward is provided, and the long part is provided. The rod (2) is engaged with the end of the hole (1 ') to prevent the rod (2) from falling out of the fixed cylinder (1), and is guided in the front-rear direction of the fixed cylinder (1) by the elongated hole (1'). The stopper (6) is set up, and this stopper ( The upper part of the rear end is a slope (6 ') descending obliquely backward, a cam member (3) is placed on the rod (2), and the rod (2) is pushed into the fixed cylinder (1). When the rod (2) is actuated to be in a locked state,
Is locked in the fixed cylinder (1), and when the rod (2) is pushed into the fixed cylinder (1) again, the rod (2) is activated to be in an unlocked state, whereby the rod (2) is unlocked.
A latch provided with cam means (3, 10, 11) for unlocking the latch.