JP2656999B2 - Improved recoil latch with release spring - Google Patents

Description

BACKGROUND OF THE INVENTION A very useful type of single-hole mounting fastener for cabinets and other analogs comprises a non-rotating latch housing that is attached to a swing door. The latch housing includes a reciprocating spring-loaded pawl that engages an edge of a metal retainer mounted inside the cabinet frame. When closing the door, the pawl slides against the tension spring in a direction perpendicular to the extension direction of the latch housing to present a cam surface to the retainer. As the door moves further toward the fully closed position in the closing direction, the cam surface of the pawl slides against its spring to its outer end, and after itself detaches from the retainer, is extended by the accumulated spring force. It is returned to the starting position. At this time, the claw presents a non-cam surface to the holder. Various opening operations, such as twisting a knob or a key or pushing an operating means such as a knob, move the claw to the retracted position, secure a gap between the non-cam surfaces passing through the holder, and release the latch. Together, it allows the door to be pulled out of the frame.

The problem with this type of key-operated or knob-operated fastener is that it does not have a positive sensational position to indicate when the latch is completely released, and thus when the door can be opened. It must be remembered that the person has applied the opening force and thereby has pulled the pawl away from the retainer and the outer edge of the top or non-cam surface has detached from the edge of the retainer. Otherwise,
The opening force by the user may press the claws against the holder and damage one or both of the holder and the claws.

Another problem with a slam-action latch that uses a keyless pushbutton as the latch actuator is that there is no structure other than the pushbutton knob that can be pulled to open the door. Once you push the pushbutton knob,
The latch is in the recessed state, and there is no object to be gripped by the user.

OBJECTS OF THE INVENTION Accordingly, it is an object of the present invention to provide a pawl latch with a positive position indicating device that can use the accumulated spring force to react against the door frame and indicate that the door has been unlocked. The object is to provide a cabinet fastener.

It is another object of the present invention to provide a positive position indicating device attachable to a claw latch for a cabinet that uses multiple opening forces.

Still another object of the present invention is to provide a door latch having a push button action in which the force for spring-opening the door is greater than the force for pushing the push button.

It is yet another object of the present invention to provide a positive position indicating device attachable to a push button claw latch using a pull tab mounted on the base.

SUMMARY OF THE INVENTION To achieve the above object, the present invention provides first and second
First of an openable closing structure constituted by cooperation of members
A latch-action latch which is mounted on the member as non-rotating engagement means, the latch housing having actuation means at a front end and a pawl at a rear end having at least one non-cam surface orthogonal to the rear end. A latch housing is attached to the first member, a flat surface of a predetermined size is disposed on the second member, and the non-cam surface contacts the flat surface when closing the first member. And a retaining means provided on the outer surface of the rear end of the latch housing on the opposite side of the pawl, wherein the retaining means is configured to latch and fix Means, mounted on the periphery of the latch housing adjacent to the pawl and the retaining means while being retained on the latch housing by the biasing force of the pawl under bias when the recoil latch is in a disengaged position relative to a flat surface. Non-power Energy to engage the surface and releasably engage a portion of the flat surface under the biasing force when the recoil latch is in the engaged position relative to the flat surface to react against the flat surface. And a biasing means for accumulating the force.

The present invention is further directed to the reaction locking latch, wherein the biasing means is a thin-walled spring having a hole therethrough, around the hole, a front tab portion and a front tab portion. And two substantially parallel leaf portions each having at least one flexure extending in the orthogonal direction, and a rear connection portion connecting the leaf portions.

The present invention further provides the above-mentioned recoil latch, wherein the front tab portion has a width substantially equal to the width of the pawl.

The present invention further provides a configuration in which the actuating means comprises a push button slidably and reciprocally held at a front end of the latch housing and a tab protruding from the front end in the above-mentioned reaction engaging latch.

The present invention further provides a configuration in which the actuating means includes a protrusion that is rotatably and reciprocally held at a front end of the latch housing.

The present invention further provides the above-mentioned reciprocating engagement type latch, wherein the actuating means has a hole inside, a circular surface provided at the front end of the latch housing, and a circular surface inserted into the hole and slides back and forth on the pawl. A key-operated means for providing an action.

Further in accordance with the present invention, there is provided a latch used to engage and secure a first and second member cooperating to form a releasable closure structure, wherein the latch is non-rotating with respect to the first member. A latch housing fixed to the first member, a retainer fixed to the second member, a claw housing fixedly connected to the latch housing and forming a longitudinal extension of the latch housing, A pawl having two non-cam surfaces and disposed within the pawl housing for reciprocating movement between an extended position and a retracted position with respect to the pawl housing; and a connection portion between the latch housing and the pawl housing. Moving means coupled to the side of the latch housing for selectively actuating the pawl in the retracted position, and surrounding the pawl housing adjacent to the latch housing for contacting at least one non-cam surface of the pawl. Biasing means disposed between the holder and the non-cam surface when the non-cam surface of the pawl is engaged with the holder, the biasing means moving the latch housing from the holder. Means for biasing in the direction away to facilitate opening of the closure structure; means for biasing the pawl toward the retracted position to facilitate engagement of the non-cam surface of the pawl with the retainer;
And a latch is provided.

The present invention further provides the above-mentioned latch, wherein the latch housing has a substantially cylindrical shape, and a pair of flat portions extending in the longitudinal direction is formed on the opposite side surface.

The present invention further provides the above-mentioned latch, wherein the width of the claw housing is smaller than the diameter of the latch housing, an overhang portion is formed at a connection portion between the claw housing and the latch housing, and the biasing means is provided at the overhang portion of the latch housing. An abutting configuration is provided.

The present invention further provides the above-mentioned latch, wherein the pawl housing further includes holding means for holding the biasing means with respect to the latch housing.

The present invention further provides the above-mentioned latch, wherein the biasing means comprises a thin-walled spring, the spring comprising a hole, a front tab portion,
Provided is a configuration comprising two substantially parallel leaf portions each extending from a front tab portion and each having at least one flexure extending in an orthogonal direction, and a rear connection portion connecting the leaf portions. I do.

The present invention further provides the above-mentioned latch, wherein the operating means comprises:
An arrangement comprising a rotatable knob extending longitudinally from a latch housing is provided.

The present invention further provides the above-mentioned latch, wherein the operating means comprises:
Provided is a configuration comprising a cylindrical push button slidably mounted inside a latch housing and reciprocating between an extended position and a retracted position with respect to the latch housing.

The present invention further provides the above-mentioned latch, wherein the operating means comprises:
Provided is a configuration including a fixing plug provided on the same plane at the tip of a latch housing.

The present invention further provides a configuration in which the reciprocating movement of the pawl occurs in a direction perpendicular to the longitudinal axis of the latch housing in the latch.

The present invention further provides the above latch, wherein the latch housing is disposed adjacent to the actuating means and engages the first member when the latch housing is attached to the first member; and the flange is fastened to the first member. And means for performing the above.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a closed cabinet door (only a part is shown)
FIG. 2 is a side view of a reaction engaging latch according to an embodiment of the present invention, FIG. 2 is an independent perspective view of a spring constituting an embodiment of the positive position indicating device, and FIG. FIG. 4 is a side view of a recoil latch according to one embodiment of the present invention mounted on a slightly open cabinet door (only partially shown); FIG. 4 is shown along line IV-IV of FIG. FIG. 5 is a rear view of a reaction engagement latch according to an embodiment of the present invention, FIG. 5 is a partial side view of a reaction engagement latch according to another embodiment of the present invention provided on a cabinet door (only a part is shown), 6 is a front view of the reaction engaging latch of FIG. 5, FIG. 7 is a partial side view of the actuation means of the reaction engaging latch according to still another embodiment, and FIG. 8 is a reaction engaging operation of FIG. It is a partial front view of a latch.

Detailed Description of the Preferred Embodiment An improved recoil latch, one embodiment of which is shown in side view in FIG. 1, has a generally L-shaped actuation means 20 (front end) forming its long leg portion. And a latch housing 30, and a claw housing 40 (rear end) and a claw 42 that form a short leg portion orthogonal to the latch housing 30. The actuating means 20 (which is one of several different types, such as a key actuated tumbler, a push button actuated cam, a twisted cam knob, etc., as described above) and a latch housing 30 extend longitudinally through both. Aligned along a virtual axis that extends to

Latch housing 30 that can be formed from zinc die casting
Has a pair of flat regions 21a and 21b opposed to each other on both sides and has a substantially tubular threaded outer shape.
D) "(which is well known in the industry). The latch housing 30 has a predetermined length from the outer mounting flange 24 to a pair of overhangs 25 formed below the latch housing at a connection portion between the latch housing 30 and the substantially box-shaped claw housing 40. Extend. Cabinet door
The attachment of this latch to 15 can be accomplished, for example, by inserting the latch housing 30 into a similarly shaped hole provided in the door 15 and then tightly tightening the nut 28 to the washer 29 to attach the pawl housing 40 to a flat surface (eg, This is performed by fixed and non-rotatable positioning in proximity to the holder 50).

The pawl housing 40 has suitable external dimensions of a length substantially equal to the diameter of the latch housing 30 and a width slightly smaller than the diameter of the latch housing 30, and is connected to the overhang 25 of the latch housing 30. You. Claw housing 40
Are flat and parallel side surfaces 44a, 44b arranged opposite to each other,
And an orthogonally arranged bottom surface 46 adjacent to them. The contours of the front and rear portions (upper and lower in the figure) of the claw housing 40 coincide with the outer periphery of the latch housing 30 with respect to the radius of curvature, and the front portion is provided with an opening that allows the claw 42 to reciprocate.

The pawl 42 is moved in a direction perpendicular to the imaginary longitudinal axis of the latch, according to either the force or spring force of the retainer 50 on its cam surface 48, as shown by the dotted line 42a and the arrow near it, as shown by the dotted line 42a. Reciprocate in and out of the. Claws 42
Is formed to have a predetermined thickness so as to slide against the inner surfaces of both side walls, and has an outer surface having a bottom slope-shaped cam surface 48 and a substantially flat upper non-cam surface 49 connected thereto. Extension part 47
Is provided. The pawl 42 is spring-biased, as is well known, and causes its outward extension 47 to protrude outside the pawl housing 40 by a specified amount. Thereby, a non-cam surface 49 having a predetermined area is provided in order to obtain an engaging action with a flat surface such as a protruding portion or another edge of the holder 50, and a cabinet door 15 is provided with respect to the frame body 16 as described later. Is fixed.

The biasing means attached to the reaction engaging latch is a spring.
Consists of 60 and acts as a positive position indicator for the latch. The spring 60 is, as shown in an independent perspective view in FIG. 2, a substantially rectangular piece made of thin spring steel, and is formed by punching a hole having a predetermined size, a rear portion 62 formed by the hole, and a plurality of predetermined deformations. It has two parallel leaf portions 64a, 64b with a section and a front tab portion 68. The spring 60 is
The rearward portion 62 is engaged with a projection 43 provided as a holding means on the rear side surface of the claw housing 40, and the flat portion 63 is extended so as to be adjacent to the surface of the overhang portion 25 of the latch housing 30. It is slidably fitted adjacent to the part 25. Alternatively, the spring 60 may have its rear portion 62 fitted into a slot 43a provided as a retaining means on the rear side of the pawl housing 40, as shown as a variant in FIG. With this structure, the rear end of the spring is anchored to the rear end of the claw housing 40, and the spring force accumulated in the spring 60 is restrained as described later.

As can be clearly seen in FIG. 2, the spring 60 has a plurality of spring flexures 65a, 65b, 66a, 66b and 67a, 67b alternately projecting in orthogonal directions on each of its two leaf portions 64a, 64b. Are provided in a predetermined arrangement. The configuration of these spring flexures connected to the anchored rear portion 62 and the protruding tab portion 68 is the spring 60
To provide elasticity to the tab 50 when the latch is closed.
Allows the spring 60 to be deformed when it comes into contact with (see FIG. 1). The bending portions 66a and 66b are pressed against the corresponding portions of the overhang portion 25 as the claws 42 are pushed to the extended position, and the tab portions
68 converts the accumulated spring force into a contact force with the holder 50. When the corresponding retraction force is applied to the pawl 42 using the actuation means 20, the accumulated spring force causes the non-cam surface 49 to
As soon as you open the tab part 68, it is restored to its original shape,
Thereby, the latch housing 30 and the cabinet door 15 are detached from the frame 16. Therefore, when the push-button actuating means 20 is used, the improved reaction engaging latch is required to push the actuating means 20 by forming the spring 60 with a spring constant larger than that of a push-button spring (not shown). The opening force of the door 15 larger than the force can be applied. As a result, when the push-button actuating means 20 is pushed in to release the cam surface 48 from the holder 50 and then released, the door 15 and the latch are pressed so as to move outward from a predetermined position, and the cam surface 48 is held by the holder. Pull it sufficiently away from 50, and make the door 15 half open.

The latch actuating means may advantageously provide the following alternative device for releasing the recoil latch. That is, a grooved protruding knob 21 that is reciprocally rotated to retract the pawl 42, or a pushbutton knob 71 (latch and handheld) that is fixedly retained by the outer flange 24 and has or does not include a handheld tab 72 that projects perpendicularly therefrom. The tab is shown in FIGS. 5 and 6), or a recessed keyed actuation means 75 shown in FIGS. The recessed key type operating means 75 includes a circular surface having a hole therein and provided flush with the front end of the latch housing, and a key (shown in the figure) which is inserted into the hole to give the pawl a sliding reciprocating operation. ).
These knobs can be made from mineral-containing nylon and the recessed fixing plugs can be made from zinc die-cast. Either type indicates an open position depending on the reaction force magnified by spring 60.

Claims (16)

(57) [Claims] 1. A reaction locking latch which is mounted as a non-rotatable locking means on said first member of a releasable closing structure constituted by the cooperation of said first and second members, and said operating means is provided at the front end. And at least one of the rear ends orthogonal to the rear end.
A latch housing having a pawl having two non-cam surfaces, said latch housing being attached to said first member;
The second member is provided with a flat surface having a predetermined dimension,
A non-camming surface, wherein the non-cam surface contacts the flat surface to engage and lock the closure structure and to set the actuating means in a latch-open ready state; A holding means provided on an outer surface of the rear end of the latch housing on the opposite side of the claw; and a holding means provided on the latch housing while being held by the holding means, adjacent to the claw and the holding means. When the reaction latch is located around the latch housing and is in the non-engaging position with respect to the flat surface, the latch engages the non-cam surface of the pawl under urging force, and the reaction latch operates. Biasing means for releasably engaging a portion of the flat surface under a biasing force when in the engaged position against the flat surface to store energy for reacting to the flat surface. Reaction Create latch. 2. The method of claim 1, wherein the biasing means is a thin-walled spring having a hole therethrough, extending around the hole, a front tab portion, and extending from the front tab portion. The reaction latch according to claim 1, comprising two substantially parallel leaf portions each having at least one flexure extending in an orthogonal direction, and a rear connection portion connecting the leaf portions. 3. The latch of claim 2 wherein said front tab portion has a width substantially equal to a width of said pawl. 4. The reciprocating engagement type as claimed in claim 2, wherein said operating means comprises a push button slidably and reciprocally held at said front end of said latch housing, and a tab projecting from said front end. latch. 5. A reciprocating latch as claimed in claim 2, wherein said actuating means comprises a protrusion rotatably and reciprocally held at said front end of said latch housing. 6. The latch according to claim 6, wherein said actuating means has a hole therein and is provided with a circular surface provided on the front end of said latch housing and flush with said pawl. 3. A reciprocating latch according to claim 2, comprising a recessed key actuating means having a key. 7. A latch used to engage and fix a first and a second member cooperating to form an openable closure structure, the latch being non-rotatable with respect to the first member. A latch housing attached to the first member, a retainer fixed to the second member, and a claw housing fixedly connected to the latch housing and forming a longitudinal extension of the latch housing. A claw having at least one non-cam surface and disposed in the claw housing to reciprocate between an extended position and a retracted position with respect to the claw housing; a latch housing and the claw; Actuating means coupled to the latch housing opposite the coupling portion with the housing for selectively moving the pawl to the retracted position; and around the pawl housing adjacent to the latch housing; A biasing member arranged to contact the at least one non-cam surface of the pawl, wherein when the non-cam surface of the pawl is engaged with the retainer, the biasing member is held between the non-cam surface and the non-cam surface; Means for urging the latch housing in a direction away from the holder to facilitate opening of the closing structure; and urging the pawl toward the retracted position. Means for biasing to facilitate engagement between the non-cam surface of the pawl and the retainer. 8. The latch according to claim 7, wherein said latch housing has a substantially cylindrical shape, and a pair of flat portions extending in a longitudinal direction are formed on opposing side surfaces thereof. 9. A width of the claw housing is smaller than a diameter of the latch housing, an overhang portion is formed at a connecting portion between the claw housing and the latch housing, and the urging means is provided on the tensioning portion of the latch housing. The latch according to claim 7, wherein the latch is disposed in contact with the protrusion. 10. The latch according to claim 7, wherein said pawl housing further comprises holding means for holding said biasing means with respect to said latch housing. 11. The biasing means comprises a thin spring comprising a hole, a front tab portion, and at least one flexure extending from the front tab portion and extending in an orthogonal direction. 8. A latch according to claim 7, comprising two substantially parallel leaf portions provided on each, and a rear connecting portion connecting the leaf portions. 12. The latch according to claim 7, wherein said actuating means comprises a rotatable knob extending longitudinally from said latch housing.
Latch described. 13. The latch means as claimed in claim 7, wherein said actuating means comprises a cylindrical push button which is slidably mounted inside said latch housing and reciprocates with respect to said latch housing between an extended position and a retracted position. Latch described. 14. The latch according to claim 7, wherein said actuating means comprises a fixed plug mounted flush with a tip of said latch housing. 15. The latch according to claim 7, wherein said reciprocating movement of said pawl occurs in a direction orthogonal to a longitudinal axis of said latch housing. 16. A flange, wherein said latch housing is disposed adjacent to said actuating means and engages with said first member when said latch housing is attached to said first member, and said flange is attached to said first member. 8. The latch according to claim 7, further comprising: means for fastening to the latch.