JPS61500450A - lock set assembly - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] lock set assembly [Reference to related applications] This application is filed September 30, 1983 and is entitled LOCKSET ASSEMBLY. This is a continuation of U.S. patent application Ser. No. 537.896, filed by Mr.

[Background of the invention]

TECHNICAL FIELD The present invention relates generally to locksets, and more particularly to locksets (latch poles) and locksets. The present invention relates to a lockset assembly that is expandable to a locking function.

lockset assembly, the disclosure of which is incorporated herein in its entirety. Mr. Toyama's pending U.S. patent application filed September 30, 1983, entitled No. 537,896, the latch bolt is fully extended from the latching position. A lockset is disclosed that is extendable to a fully locked position. As shown in this application Depending on the function, the latch bolt is a key-actuated shilling or It can be extended to its fully locked position by either of the rotary buttons on the inner actuating member. Ru. The inner actuating member always latches even in the latched or fully locked position. You can force Cchivolt to leave. However, the basis indicated in this application It is possible to employ the foundation mechanism for other functions.

[Summary of the invention]

It is an object of the present invention to provide an improved latch bolt and main lock which function together. The objective is to provide a lock set assembly/preparation system.

More specifically, it is an object of the present invention to ensure that the latch bolt is fully locked when the door is closed. The object of the present invention is to provide a lockset assembly that can be automatically extended into position.

Still another object of the present invention is to automatically tighten the latch bolt when the door is closed. The latch bolt can be extended to the key position and the latch bolt is in the latching position when the door is opened. Our goal is to provide lock cent assemblies that stay in place.

Another object of the invention is that when the actuating member is in its "locked" position, the latch bolt When door 1 is closed, it automatically moves to the final lock position, and the actuating member When in its "clean" position, the latch bolt locks the latch after the door is closed. The purpose of the present invention is to provide a lock set assembly that can be easily secured in position.

Yet another object of the present invention is to provide a latch bolt that is movable to an extended locking position. a lockset that utilizes a latch assembly having a latch bolt attached to the latch assembly; The present invention provides a lockset including means for maintaining an intermediate latching position.

These and other aspects of the invention can be achieved by providing a lock set as described below. can be achieved.

[Description of drawings]

Figure 4 shows the lock set installed in the metal door frame and its main lock. Horizontal axis of lockset showing latch bolt in fully extended position FIG.

Figure 2 shows the latch bolt with the latch bolt in its fully extended position. FIG. 3 is an inverted side view of the Thibold assembly.

Figure 3 is a figure 9 similar to figure 2 showing the latch bolt in its launching position. It is.

Figure 4 shows the latch bolt in its open position, i.e. fully retracted and in its original position. This figure is similar to Figure 2.

Figure 5 shows the bolt moving forward toward its extended position after the door is closed. FIG. 2 is a diagram similar to FIG.

6 is an end view of the latch assembly taken along line 6-6 of FIG. 2; FIG. .

FIG. FIG. 1 is a view taken along line 8--8 of FIG. Ru.

Figure 9 is similar to Figure 8 showing the position when the turn button is in its released position. This is a similar diagram.

FIG. 10 is a cross-sectional view of the latch assembly taken along line 10-10 of FIG. It is.

Figure 11 shows different models showing the latch bolt in its fully tightened position. FIG. 12 shows a modified latch assembly for the function in its intermediate latching position. 12 is a view similar to FIG. 11 showing the latch bolt in FIG.

[Detailed explanation]

The basic structure of the lock set of the present invention is disclosed in the above-mentioned pending application No. 537.896. This application is hereby incorporated by reference as it is described in detail in Figure 1. The lock-setting mechanism 1 is fitted with a metal dowel, these being in the preferred embodiment: They are a lever 8 and an inner lever 10. These outer levers 8 and inner levers 10 is to drive the latch bolt 12 of the latch bolt assembly 14 of the lock set mechanism. Removal from the catch box 16 and the catch plate 18 that were attached to the grill 20 using the conventional method. It is used to force someone to leave. The outer actuation assembly 27 of the lockset includes an outer The inner actuating assembly 38 set in the lever 8 has a mounting plate in the inner lever 10. A tilted rotation button 26 may be provided.

and to perform rotational movement relative to the outer rose 28 by means of the retaining ring 31. a generally square section and lower ear-shaped projection (not shown) that is held in place by the sea urchin. ), and these protrusions are located thereon. The latch bolt assembly extends from the door 2 and is located within the door 2. Ru. The latch bolt assembly holder 34 holds the latch bolt assembly 14. A mechanism is provided for attaching the latch, which includes a latch bolt 12 and a latch bolt 12. It includes a suitable slot 36 into which the Tivolt assembly 14 can be inserted.

Similarly, the inner actuator assembly 38 causes the inner lever 10 to perform four relative rotations. A retaining link set 46 is attached to it so that it can be attached to the This cassette 46 is connected to a groove (not shown) provided in the latch bolt assembly holder 34. including an upper ear-shaped protrusion and a lower ear-shaped protrusion (not shown) extending to There is. Movement of latch bolt 12 through and inwardly to latch bolt assembly 14 It extends in a direction perpendicular to the axis of the This lock set is based on the above patent publication. 537.896; Ru.

This outer actuating cassette 32 has a projection 30 of the outer lever 8 extending therein. It includes a housing 50 having a central opening 52. Inside the outer operating cassette 32 An actuating member 54 is attached to the housing 50, and a boss 56 of the actuating member 54 is attached to the opening in the housing 50. The actuating member 54 is mounted within the port 52 and includes the outer lever 8. There is. The actuating member 54 includes a base portion 60 and a thin elongated tail portion 62. This tail portion 62 extends from the base portion 60. Front of tail part 62 The end includes a thick V-shaped cam extending inwardly through the inner plane of the tail portion 62. A surface 64 is provided.

Within the housing 50 of the outer actuation cassette 32 is a spring plate finger 68 (the each finger 68 includes an actuating member 54 (of which only one is shown). a cam follower surface configured to be engaged by a V-shaped cam surface 64 disposed on the have. The spring plate 66 is actuated by two lever springs (not shown). in the direction of extension of latch bolt 14 and in front so as to engage camming surface 64 of member 54. It is biased towards

Within the housing 84 is a generally flat rack plate 70 that supports the spring plate 6. It is arranged in an overlapping relationship with 6.

The rack plate) 70 is provided with teeth 72, which allow the latch bolt assembly to A rack is formed that extends parallel to the axis of the assembly 14. Rack plate 7 At the front end of the rack plate 70, the actuating member is moved 540 times depending on its front position. a lug extending inwardly from the forward end of the actuating member 54 while preventing rotation; A notch 72 is provided with a notch 74 extending therein. rack plate 70 is attached to the front Ujifugu 50 by a spring member 76, and The rearward movement of spring plate 66 causes rack plate 70 to It is configured to move backwards, as fully described in the application.

A pinion member 78 extends perpendicularly to the axis of the latch bolt assembly 14. In fact, this pinion member 78 is mounted within the outer actuating cassette 32 and and includes a set of gear teeth 8o, these teeth 80 are arranged in the rack plate 70. It includes a cylindrical extension 82 extending into an opening 84 in the gear tooth lever 8 .

The head portion 86 of the pinion member 78 has a section of the spindle 48 extending therethrough. It has a generally rectangular slot 88 therein having a cross-section opposed to a face. . The cylindrical extension part 82 moves from the extended fully locked position to the main lock position according to the degree of rotation of the key. In order to rotate the pinion member 78 to the withdrawn position, that is, the latch bolt position. Engageable by a drive member 92 connected to lock cylinder 22 in outer lever 8 The actuating member 54 is connected to the spindle 48 by an internally opposed lip 90 (one of which allows the actuating member 54 to The lever 8 pivots about its axis and is operatively attached to the outer lever 8. Ba The rack plate 66 and the rack plate 70 are attached to the latch of the latch bolt assembly 14. inside the housing 50 to perform linear movement in a direction parallel to the movement of the Tivolt 12. It is attached to.

The outer actuating cassette 32 includes the actuating components as a unit within the outer cassette 32. A cover member 94 is provided to contain the cover.

The inner actuation assembly 38 is connected to the inner rose 40. and outer by retaining ring 96. An inner rail connected to the inner rose 40 in a similar manner to the side actuation assembly 27. It includes a bar 10. The inner working cassette 46 contains essentially the same elements. It is constructed similarly to the outer actuating cassette 32 described above.

It includes an inner housing 98 that is movably mounted therein. Inside work The moving member 100 includes a thick V-shaped cam portion 104 and a rectangular protrusion 4 of the inner lever lO. 2 includes a central, generally square aperture 102 projecting therein. inner how Within ring 98 is a cam surface 10 for engaging cam portion 104 of actuating member 100. 8 (only one of which is shown) is attached to the spring plate 106. It's shaking. As with the outer actuation mechanism, this spring plate 106 It is spring biased forward by a suitable spring member (not shown).

Within the inner housing 98 is a rack plate 110 having gear teeth 112. It is attached in an overlapping relationship with the top plate 106. rack plate 1 10 can be spring biased forward by a spring member 114; can also be omitted. However, the rack of the outer actuating assembly 27) 70, the front end of the rack plate 110 of the inner actuation assembly 38 is short. When it is in its front lock position as shown in Figure 1, the front It does not include a notch so that the other end does not engage the lug portion 116 of the actuating member 100. . As a result, the rack plate 110 of the operating member lOO is in its forward final locking position. Pivot freely when in position.

The inner pinion member 118 meshes and engages with the teeth 112 of the rack plate 11o. It includes gear teeth 120 thereon. Pinion member 118 is connected to the inner actuating cassette. An opposing lip 124 . extends through the opening 128 in the inner lever 10 through the opening 128 . It includes a cylindrical extension 122 having a diameter of 126. Head portion of pinion member 118 130 also includes a slot through which one end of spindle 48 extends. It includes a cut 132. A cover 133 is attached to the housing 98. This includes the actuation mechanism.

1 and 7 will be explained. The rotation button 26 extends inwardly from there. It includes a knob 134 having a rod 136 that extends therethrough. The end of the rod 136 is The opposing lips 124 and 126 within the cylindrical extension 122 of the inner pinion member 118 including two mutually opposed radially extending ears 138 and 140 for mating. I'm here. This rod 136 has a cam section having a cam slot 144 therein. The cam member 142 extends through the cam member 142 and rotates relative to the cam member 142 .

A cam follower 146 in the form of a roll pin extends radially outward from the rod 136. It extends toward the side and enters the cam slot 144. Between the cam member 142 and the knob 144 A spring 148 is provided on the side, which biases the ship 144 outward. There is.

The cam member 142 is configured to prevent rotation of the cam member 1420 relative to the lever 10. , a bump 150 that engages a notch (not shown) in the opening 128 of the inner lever 10. is included in its circumference. This cam member 142 also allows the cam member 142 to Inwardly projecting tongue 152 with shoulder 154 for retention within bar 10 Contains. When installed within the lever 10, the rod 136 It extends into the pinion member 118 of the assembly.

The cam slot 144 extends partially around the circumference of the body of the cam member 142. The shaft includes a generally straight section 156 and a stop for the cam follower 146. It includes an axially extending locking groove 155 forming a stop shoulder. knob 14 4 is the lock in which the cam follower 146 is in the straight section 156 of the cam slot 144. When rotated from its released position to its released position, the cam follower 146° axially The clamp extending in the direction reaches the groove 158. At this point, knob 144 and Rod 136 moves outward under the force of spring 148, thereby causing 36 and the cam member 142, thereby preventing the ship 144 from being manually operated. Hold the knob 134 in the unlocked position until it is pushed inward and rotated.

2 to 5 and 10, the latch bolt assembly 1 The latch bolt 12 of No. 4 is in its extended fully tightened position in Fig. 2 and in its fully tightened position in Fig. 3. movable between the latching position and its fully retracted open position as shown in Figure 4. Illustrated. The latch bolt assembly 14 extends rearwardly therefrom. The latch has two spaced apart latch plates 162 and 164 (FIG. 1). 160. The latch plates 162 and 164 are are held attached to each other by screws 166. latch bolt assembly The bridge 14 attaches the latch bolt assembly 14 to the latch bolt holder 38. A screw 167 extends through the rear one of these bushes 166. and is installed in the slot 36 in the latch bolt assembly holder 34. Ru.

A hub member in which two lever plates 170 are attached to rotate together. 168 is a suitable opening between and within the two latch plates 2 and 1640. It is installed inside. This hub member 168 receives the spindle 48. It has a generally rectangular lumen 172 having a cylindrical shape. Inside the latch case 160 The bolt 12 is installed and the bolt 12 extends outwardly from there and from the lever. It has an arm 174 (FIG. 10) extending toward the plate 17o. . The arm 174 is pivoted to the bolt 12 at its forward end and at one end, extending through an extension slot 178 in each of the lever plates 170. It has a pivot pin 176. An arm 174 is disposed therein. #18o is also pivoted to the rear end of bolt 12. Ru.

As described in the above-referenced U.S. patent application, there is a spring-biased mating pin within the bolt 12. This dowel pin 182 has an end face attached to the arm 17. It is engaged with one corner of the front part of 4. This work requires that the pivot pin 176 oriented to engage upper edges 184 of latch plates 162 and 164. It has the function of biasing the beam 174.

The upper edges 184 of the latch plates 162 and 164 hold the launch bolt 12 in place. rear facing engageable by pin 176 to stop in the latching position of It includes a rear cutout 186 forming a stop layer 188. Before the notch 186 On the other hand, the upper edge releasably holds the bolt 12 in the extended fully tightened position. slanting downwardly towards another notch forming a notch 190 for holding the There is. In order to bias the bolt 12 forward into the final locking position, the spring 191 is 162 and 164 and the latch bolt 12.

A latch release plunger 192 is installed in a slot 194 in the bolt. This plunger 192 is located at the front that exits the latch case 160 and extends forward. The cam portion 198 extending rearward from the extending catch abutment 196 and the case 160 is have.

This latch release plunger 192 is connected to the bolt 12 so as to face the lever 200. located on the side of the This cam part 198 is divided into two parts, the upper part and the lower part. The lower rear facing cam surface 202 is of a flannel-containing type, and inside this intermediate portion 204, Spring 206 and shoulder 208'? Between the folded protrusion 210 of the Z chikusu 160 Once installed, this will move the lock release plunger 192 to its forward position. It's biased. The unlatch pusher 192 is biased to its forward position. The front surface 212 of the cam part 198 is connected to the rear wall 214 (the tenth part) of the latch case 160. (Fig.). In this position, the seat abutting portion 196 is attached to the end of the bolt 122. Extend outward adjacent to.

The pair of rear facing layers 216 of the bolt 12 are arranged so that upon inward movement of the bolt 12, i.e. When bolt 12 is withdrawn from its latching position to its open position, 12 moves the latch release plunger 192 inwardly as shown in FIG. Behind the stop layer 108 of the open position device plate 162.

The operation is substantially identical to that described in patent application Ser. No. 537.896.

Therefore, the operation of such elements is necessary and essential for the present invention. Positions which will not be described in detail except for purposes of understanding the invention, i.e. cam follower 146. is in the straight section 156 of the cam slot 144, the latch bolt 12 As shown, the latch release plunger 192 is in its extended fully locked position. It is held in its rearward open position by the wind blower 18. In this position, outer lever 1 0 cannot rotate, but this is because the rack plate 70 is in its forward position. sb and the lug portion 74 of the actuating member 54 is placed within the notch 72. It is.

This configuration prevents the outer lever 8 from rotating, since there is no mounting on it. This is because the attached actuating member 54 is not rotated. Inside actuating assembly Rack play of rack 38), since there is no notch inside 110, the inner lever 1 0 is free to pivot about the axis of the turndle 48 and its cam portion 104 is The spring plate 108 engages a cam surface 108 on the end of the plate 106, thereby causing the spring plate 108 to Move backwards and in a straight line. To the rack plate 110 of the spring plate 108 The rack plate 110 also moves rearward and in a linear direction. As a result, the pinion member 118 rotates and therefore the spindle 4 8 and the hub member 168 of the latch bolt assembly 14, thereby The latch bolt 12 is completely retracted to substantially the position shown in FIG. door opens When the operator releases the inner lever 10, the latch bolt 14 and the latch release are released. The anti-silangers 192 move forward under the force of their respective springs. latch The bolt 14 is attached so that the pivot pin 176 is attached to the upper edge of the latch plates 162 and 164. engages the stop layer 188 of the bolt, thereby holding the bolt 14 in its latching position. Move forward until held in position. When the door closes and passes through the catch 18, the latch bolt 14 and the latch release plunger 192 are moved by the catch 18 as shown in FIG. Move and enter their open position. In this position, the pivot bin 176 is It is located behind the cam surface 202 of the trigger 192. 9A is completely closed. Then, the latch pole 14 moves forward under the force of the latch spring 191 and closes the catch box. 16, on the other hand, the latch release plunger 192 is inserted into the catch 1 as shown in FIG. 81C, it is held in its rear open position. Bolt 12 moves forward and the book Once in the locked position, the upper edges 1 of the unlatching sylangers 192 and 164 The stop layer 188 of 84 is moved upwardly, thereby causing the pivot pin 176 to This is the front pin holder with the latch bolt 12 in its fully extended, fully tightened position. Continue advancing until notch 190 is engaged. of the rod 136 of the rotation button 26 The ears 138 and 140 and the extension portions 124 and 126 of the pinion member 118. When the rotary button 26 is moved to its locked position, the In other words, when the cam follower 146 is located within the fixing groove 156 of the cam slot 144. , the inner pinion member 118 rotates, which causes the spindle 148 to rotate, This rotates the hub 168 of the shutter assembly 14 to its latched position; This causes the latching bolt 12 to retreat to its latching position. at this position In this case, the pinion member 118 of the rotary button 26 and the ears 138 and 1 40, the rotation of the pinion member 1180 in the counterclockwise direction is the lock of the rotation button) '13 6 ears 138 and 140 are engaged by the ribs 124 and 126. It is located as shown in FIG. Cam follower 146 pushes knob 134. It must be manually released from the fixing groove 158 in the cam slot 144 by rotating. Therefore, the latch bolt 12 can be used even if the latch release plunger 192 , for example, even if the door is moved backwards by closing the door, it will remain in the intermediate position. held. Thus, latch bolt 12 prevents rotation button 26 from releasing its release. position, simply move from its open position to its latching position and forward. be.

2) When 12 is in its intermediate or latching position, the outer rack plate The notch 70 disengages from the lug 74 of the actuating member 54. held in an intermediate position. Therefore, this actuating member 54 can freely rotate, thereby The outer lever 10 moves the latch bolt 12 from its latching position to its open position. The door can be rotated to open.

Lock cylinder 22 has its drive engaging lip 90 of outer pinion member 92. The moving member 92 allows the door to be moved to the fully tightened forward position with the latch bolt 12 fully extended. It can be used to open a door when it is locked in place. But long The cylinder 22 and the key are used to unlock or unlock this function. It cannot be used in a way that causes a change in behavior.

11 and 12, both the outer actuating member 4 and the inner actuating member 60 are drive members. from there to the respective inner and outer pinions and engaged with the reso. modified form of latch that may be used when using a key actuated cylinder member Bolt assembly 220 is shown. This latch bolt assembly is shown in Figure 2. Generally similar to the latch bolt assembly described in connection with FIGS. Similarly, this latch bolt assembly has two bolts extending rearward from it. spaced latch plays) 162 (only one of which is shown) The latch case 160 includes a latch case 160. This latch plate 162 is attached to the bushing 1. They are held attached to each other by 66. two lever plays ) 170 (of which only one is shown) are placed above it so that they rotate together. A hub member 168 attached to the It is installed in a suitable opening inside. This hub member 168 is connected to the spindle 4 8 has a generally rectangular lumen 172 shaped to receive the lumen 172. bolt 12 However, it is installed together with the latch case 160, and the lever play is performed from there) It has an arm 174 extending rearward toward 170. arm 174 is pivoted at its front end, and pole (as its rear end) 12 is a lever press. a pivot pin 17 extending through an extension slot 178 in each of the ports 170; 6. Insert the spring biased dowel pin shown in the previous example into the bolt 12. 12 to its forward final tightening position. A bolt spring 191 extends between the side plate and the latch bolt 12. in this case , hub 168 includes a generally V-shaped tab portion 222 . Spring member 224 Wrap one end part by pushing backward 1660 times, and then latch the middle part. The Polda Impuri 14 is attached to the latch bolt assembly holder 38. It is wrapped in a 167-inch container. This spring also has a forward and downwardly extending intermediate section 226. and a generally vertically extending forward end 228 as shown in FIG. .

When the latch bolt is in its fully extended pre-tightened position, the tail of the hub The screw 224 engages the middle portion 226 of the screw 224, which causes the pivot pin to latch. located within the notch 230 at the forward end of the notch 232 in the upper edge of the plate 162. Shift it to its forward position. The latch bolt 12 is at the intermediate latching position. When moved to position, the tailpiece engages the generally vertical portion 226 of the spring and The spring biases the hub 222 from rotating clockwise to the open position; Otherwise, hold the latch bolt in its intermediate latching position. In this example , a key actuated cylinder in the inner or outer member locks the main lock in its extension. It can also be used to move the hub member from a fixed position to an intermediate position. moves against the biasing force of the spring, thereby lifting the main lock from its intermediate position. It can be used to move to a marked position.

Although specific embodiments have been described above, those skilled in the art will appreciate the spirit of the invention. It is understood that various modifications and changes may be made to the embodiments described above without departing from the same. Let it be clear. Accordingly, the scope of the invention should be determined by reference to the following claims. is intended to be confirmed.

international search report 1-1-A-11"', PCT/US841'O1402

Claims (12)

[Claims] 1. Partially extended latching position, fully extended locking position, and withdrawal a latch bolt assembly including a bolt movable between spring means for biasing the latch towards its final locking position; a spindle extending through the bolt in a direction transverse to the direction of movement of the bolt; , means for connecting the spindle to the bolt, the means for connecting the spindle to the bolt; means for moving said bolt between said positions upon rotation and the door being opened; means for retaining said latching bolt in its latching position when means operable when the door is closed; and means for moving the door lockset into position. 2. The latch bolt assembly extends from a spaced side plate. spindle means mounted in the casing having a an opening rotatably mounted and through which the spindle extends; a hub including a port; a lever means extending from said hub; and said bolt at one end; an arm pivotally connected at the top and at the other end to the lever means; prevents the bolt of the hub from rotating to the fully tightened lock position when the door is opened. and means for releasing the locking means when the door is closed. A lock set according to claim 1, characterized in that it comprises: 3. Prevents the bolt from moving to the final lock position when the door is closed. Claim 2, further comprising a release means movable to a release position for release. The lock set described in section. 4. The latch bolt assembly connects the arm and the lever means. Contains a pivot pin, with the side plate holding the bolt in the latching position. characterized by having a shoulder for engagement by said pivot pin in order to A lock set according to claim 2. 5. The latch bolt assembly lifts the pivot pin when the door is closed. Claim 4, characterized in that it includes means for releasing from the recording position. Locset. 6. The front part and the side plate where the release means extends forward from the case a plunger having a rear portion extending along the pivot pin, the plunger having a rear portion extending along the pivot pin; is engaged with the shoulder, the pivot pin is engaged with the pivot pin, and the pivot pin is raised upward. This will cause the bolt to move when the plunger moves rearward. a plunger having a cam surface that allows the lock to move to its final locking position; and means for biasing the plunger in a forward direction. A lock set according to claim 5. 7. a release means movable to a release position, the release means being movable to a release position, the release means being movable to a release position, the button being and a release means for preventing the bolt from moving to its fully locked position. The lock set according to claim 4. 8. Claim 7, wherein the release means includes a rotation button. The lock set. 9. including an inner and an outer lever, the outer lever latching the bolt; operatively coupled to the spindle for movement from the position to the open position. The inner lever moves the bolt from its fully tightened position to its open position. operably connected to said spindle to The lock set described in item 4 of the scope of the request. 10. The above outer lever is a key actuated cylinder, i.e. when the above cylinder is rotated, Connect the cylinder and the top so that the bolt moves from its fully tightened position to its open position. Claim 9, further comprising means for interconnecting said spindles. The lock set described in section. 11. In the latch assembly used for locksets, extending rearward from there. a casing having spaced apart side plates arranged therein and rotating within said side plates; a hub having lever means pivotally mounted and extending therefrom; , move between the open and fully retracted position and the partially extended latching position a bolt pivotally connected to said bolt at one end and said lever at the other end; - an arm pivotally connected to the means and a spring means attached to said side plate; When the latch bolt is in the final locking position, move the latch bolt forward. and when the latch bolt is in the latching position, the latch bolt is biased to the open position. and spring means for biasing the latch bolt against movement. latch assembly. 12. The hub has a tailpiece, and the spring has a tailpiece when the bolt is in the fully tightened position. said tailpiece when in the latching and latching positions. A latch assembly according to claim 11.