CN1880715A - Tubular latch - Google Patents

Abstract

The invention provides a tubular latch comprising a housing, a latch bolt slidably disposed in the housing, an inner front bracket fixed at one end of the housing, a spring arranged to operate on the latch bolt to urge the latch bolt to pass through an opening in the inner front bracket to project out of the housing, a follower arranged to operate on the latch bolt to pull back the latch bolt against the operation of the spring, wherein the follower provides a second spring in the form of a strong spring whereby the latch bolt can be operated by a handle without a spring, wherein the latch bolt has a U-shaped elongate latch bolt plate with a head provided on an elongate sheet of the U-shaped elongate latch bolt plate and a support arm of the U-shaped strip is provided with a projection which locates in an elongate aperture in the housing against one end of the aperture, to restrain the latch catch plate in the housing.

Description

Tubular latch

technical field

The present invention relates to an improvement of a tubular latch.

Background technique

One current form of tubular bolt uses a single spring and sets the spring to operate on the bolt pin. With the arrangement described above, it is impossible to use a door handle or knob without a spring because the spring does not have sufficient force to return the handle or knob to their original position. If a stronger spring is used to provide the proper return force, the force applied to the latch pin will be too high.

To date, one solution to the above problem has been to use a first spring to operate on the deadbolt pin, and a second spring to operate on the driven wheel. This arrangement allows a relatively light spring to operate on the deadbolt pin while a strong spring simultaneously operates on the driven wheel for use with unspring-mounted handles or knobs. A major disadvantage of this kind of collocation is that coil springs will be used first, which will not be suitable for the use of bolt-through-attached door locks.

Contents of the invention

The object of the present invention is to provide a tubular latch to overcome the problems of the above-mentioned matching methods in the prior art, wherein the tubular latch is a door lock that can accept a pin-through type, and the tubular latch can be used without installing a spring. door handle.

Accordingly, the present invention provides a tubular bolt, which includes a housing, a bolt bolt slidably disposed in the casing, an inner front bracket fixed to one end of the casing, and a first spring disposed on the bolt bolt. It works on the bolt to make the bolt protrude from the housing after passing through the opening in the inner front bracket, and also includes a driven wheel arranged to work on the bolt to resist the operation of the first spring and return to the spring. pulling the bolt, wherein the driven wheel provides a second spring in the form of a torsion spring, whereby the bolt can be operated without a spring-mounted door handle, wherein the bolt has a U-shaped strip of the bolt plate, A pin head is provided on the latch plate sheet of the door latch, and wherein the U-shaped elongated support arm provides a protrusion, which is located in an elongated through hole in the housing, and the protrusion will bear against the through hole One end of the , which constrains the latch latch plate in the housing.

According to a preferred embodiment of the present invention, the driven wheel includes a central core area, which includes a perforation for accommodating the rotating shaft of the door lock; a driving disc located near the perforation of the central core area, and the The deadbolt latch plate engages and includes a protruding portion engaged with a fixed point of the housing.

More preferably, the second spring is a spring in the shape of a torsion spring, one end of which is engaged with the driven wheel, the middle area of the spring is wound on the driven wheel, and the other end of the spring is connected with a Components that rotate together with the pulley are engaged. One end of the second spring may be incorporated into a hole or bore of the driven wheel, or may be arranged to engage with a protrusion on the driven wheel. The other end of the second spring is preferably arranged to engage a side wall in the housing.

The latch bolt is preferably provided with a latch head which is rotatably seated on the latch latch plate, whereby the latch head can be rotated 180° to produce a latch suitable for left-handed or right-handed holding.

More preferably, the inner front support includes a disc body with a recessed area, and the plug head is located in the recessed area.

The invention will now be described in detail with reference to the embodiments shown in the drawings.

Description of drawings

Figure 1 is a front view of an embodiment of a door latch according to the present invention;

Fig. 2 is a cross-sectional view taken along the arrow direction of the Π-Π line in Fig. 1, and

Fig. 3 is a planar general view of the latch shown in Fig. 1 and Fig. 2 .

Explanation of reference numerals: half shells 1, 2; inner front bracket 3; central depression area 4; ear portion 5; rod body 6, 7; strip sheet 8; support arms 9, 10; pin head 11; pin 12; Spacer plate 13; central raised area 14; coil spring (first spring) 15; recessed area 16; post 17; recessed area 18; driven wheel 19; opening 20; torsion spring 21; Other end 23 ; cam assembly 24 ; shoulder 25 ; cam assembly (drive plate) 26 ; shoulder 27 ; hole 28 ; cutout 29 ;

Detailed ways

Referring to the accompanying drawings, the bolt according to the invention comprises a tubular housing made up of two half housings 1, 2 adapted to be combined with each other. An internal front holder 3 having a central recessed area 4 is provided on one end of the mutually joined half-shells 1, 2 by protruding ears formed at one end of the half-shells 1, 2. part 5 and fixed. The other ends of the half-shells are provided with a straight hole, and a pair of rods 6, 7 are located in the hole.

A bolt latch plate is slidably arranged in the housing, and the latch latch plate is composed of a long sheet 8 and a U-shaped strip formed by several support arms 9 and 10 . The latch head 11 is arranged on the strip sheet 8 of the bolt latch plate by means of a bolt 12, so that the latch head can rotate together with the strip sheet. When the latch plate is in the normal position, the pin head 11 is located in the recessed area 4 of the front bracket 3, and the pin head has a slight distance from the recessed area, so that the pin head can be connected with the front bracket 3 together. rotate.

A spacer plate 13 is snapped into the narrow hole of the two half-shells, the spacer plate has a central raised area 14 for placing one end of a coil spring 15 . The other end of this coil spring 15 is then positioned at the rear end of this bolt 12, therefore, this coil spring can push the bolt bolt plate to the direction facing the front holder 3, and it is withdrawn from the outside of the shell.

One of the support arms 9 of the latch plate is longer than the other, and the longer support arm 9 is provided with a recessed area 16 which terminates in a protruding post 17 located between the half In the narrow hole formed by the recessed area 18 on the side wall of the housing 1, 2. The position of the post 17 in the narrow hole just limits the range of movement of the deadbolt latch plate in the housing.

Each half shell is also provided with an annular notch, and the two ends of the driven wheel 19 are located in these notches. The driven wheel is provided with an opening 20 with a square sectional surface for accommodating a rotating shaft of a door handle assembly (not shown). A torsion spring 21 is located at the central area of the circular body of the driven wheel 19, one end 22 of the torsion spring is combined in a narrow hole of the driven wheel, and the other end 23 of the torsion spring is connected to the half shell 1 The side wall of the bolt is combined, and the combined position is located in the recessed area 16 on the support arm 9 of the bolt latch plate.

The driven wheel 19 has a first radially extending cam assembly 24 , which has a shoulder 25 , and the shoulder is abutted against the rod body 6 by the operation of the torsion spring 21 . The driven wheel 19 also has a second radially extending cam assembly 26 which has a shoulder 27 which engages with the post 17 on the bolt plate of the latch. The cylinder 17 is opposed to the shoulder 27 by the force of the coil spring 15 .

The two half shells 1, 2 are also provided with a straight hole 28 and a cutout 29 at the rear end of the shell which is far away from the front support 3 .

In use, a bolt housing according to the present invention will be located in a door opening of a door or the like. A hole 28 in the housing and a cutout 29 allow the bolt to pass through so that a bolt-through door lock (such as a handle or knob) can be fitted to a door or the like. Two ends are provided with the square sectional surface rotating shaft of handle or ball handle and are positioned in the opening 20 of this driven wheel 19 square sectional surface. The latch head 11 can be rotated according to the desired way of opening the door or the like from left-hand or right-hand direction. The front bracket 3 is fixed to the door or the like on the door or the like by means of an outer front bracket panel 31 outside the inner front bracket 3, and then fixed to pass through the opening 32 on the outer front bracket or panel. A screw, which also passes through the linear opening in the inner front bracket, eventually snaps (screws) into the solid material of the door or the like.

If the handle or knob is turned, the square shaft will rotate the driven wheel 19 against the action of the torsion spring 21 and the shoulder 27 will force the post 17 against the action of the coil spring 15 to move the latch The latch plate enters the housing, whereby the bolt latch head 11 also moves into the housing, so that a door without a latch or the like can be opened. And when decontroling the handle, the power of the torsion spring 21 will move the driven wheel, making it return to a certain position, in this position, the shoulder 25 and the rod body 6 resist each other, and the shoulder 27 will return to a certain position simultaneously. A position in which the coil spring 15 will force the plug head 11 to protrude from the housing, the movement of which is limited only by the engagement of the post 17 on the shoulder 27 .

The elastic strength of the coil spring 15 can be less than that of the torsion spring 21, because it only needs to operate a small elastic force to the bolt plate of the door latch. And assume that the spring force is between 6 and 12NT. A stronger and more powerful torsion spring will make it possible to use handles without springs, because these handles without springs will return to their normal positions by the force of the torsion spring 21 .

The present invention is not limited by the above embodiments, but equivalent changes and modifications can be made thereon. For example, one end of the torsion spring is not arranged in the narrow hole of the driven wheel 19, but is arranged in a hole of the driven wheel, or one end of the torsion spring 21 is engaged with a protrusion on the driven wheel arrange.

Claims (1)

1. tube type latch, it is characterized in that: comprise a housing, one bolt latch, it is located in this housing slidably, one inner forestock is fixed on an end of described housing, one outside forestock, one spring setting acts on described bolt latch to impel in it passes, hole in the outside forestock, and one driven member act on the described bolt latch, the described bolt latch of pulling back with the action of resisting described spring, described bolt latch comprises a bolt pinboard and a fork, and described fork is located on the bolt pinboard rotationally, wherein said inner forestock comprises that one has the disk body of depressed area, and when described outside forestock engaged with described inner forestock, described disk body and outside forestock were possessed distance; And fork is also possessed distance with the bottom of described depressed area when being passed by a hole of inner forestock depressed area.