CN216690644U - Three-rod type handle lock - Google Patents

Abstract

The utility model discloses a three-rod type handle lock, which comprises a bolt assembly, a front cover assembly and a rear cover assembly; the front cover assembly comprises a front cover body and an outer handle, a lock core and a front through block are arranged in the outer handle, and a clutch piece and a transmission rod are arranged in the front through block; the rear cover assembly comprises a rear cover body and an inner handle, a button and a rear through block are arranged in the inner handle, and a first linkage block is arranged in the rear through block; one end of the transmission rod is connected with the lock cylinder, and the other end of the transmission rod penetrates through the lock tongue assembly, the second rotating piece and the rear through block and then is connected with the first linkage block; the inner side of the front cover body is provided with a first fixing groove, the inner end of the front through block is provided with a first flanging, the front through block is sleeved with a first rotating part, one end of the first rotating part is embedded in the first fixing groove, a first clamp spring is installed between the other end of the first rotating part and the first flanging, a front reset torsion spring is arranged between the first rotating part and the front cover body, and the front reset torsion spring is sleeved in a groove of the first rotating part. The first rotating piece and the front reset torsion spring are convenient and firm to install.

Description

Three-rod type handle lock

Technical Field

The utility model relates to a three-rod handle lock.

Background

The conventional three-bar type handle lock generally includes a latch bolt assembly installed in a door, and a front cover assembly and a rear cover assembly installed at both sides of the latch bolt assembly. The front cover assembly comprises a front cover body, an outer handle is arranged on the front cover body, a lock cylinder is arranged in the outer handle, a front through block rotating along with the outer handle is further arranged at the rear end of the lock cylinder in the outer handle, a front rotating block is mounted at the rear end of the front through block, a front reset torsion spring is arranged between the front rotating block and the front cover body, and a clutch is further mounted in the front through block; the rear cover assembly comprises a rear cover body, an inner handle is arranged on the rear cover body, a rear through block is arranged in the inner handle, a hollow button is arranged at the outer end of the rear through block, a first linkage block is arranged in the rear through block, the button is movably connected with the first linkage block, a rear rotating block is arranged at the inner end of the rear through block, and a rear reset torsion spring is arranged between the rear rotating block and the rear cover body; the spring bolt assembly comprises a spring bolt body, a transmission sleeve is sleeved in the spring bolt body, a transmission rod is sleeved in the transmission sleeve, one end of the transmission rod penetrates through the front first rotating piece and the front through block and then is connected with the lock cylinder, the other end of the transmission rod penetrates through the second rotating piece and the rear through block and then is connected with the first linkage block, and a locking pressing block is arranged on the transmission rod and is arranged in the clutch. According to the three-rod handle lock with the structure, the tail end of the front through block/the rear through block is provided with the plurality of clamping feet, the clamping holes are formed outside the front rotating block/the rear rotating block, the front rotating block/the rear rotating block are fixed on the front through block/the rear through block through the matching of the clamping holes and the clamping feet, the front through block/the rear through block is inconvenient to mount and not firm to fix, and the clamping feet are complex to punch and are not hard enough; the front reset torsion spring/the rear reset torsion spring is sleeved outside the front rotating block/the rear rotating block and cannot be well fixed in the axial direction. Therefore, there is a need for improvement thereof.

SUMMERY OF THE UTILITY MODEL

The utility model provides a three-rod handle lock, which is used for solving the problem that a front through block/a rear through block and a front rotating block/a rear rotating block in the three-rod handle lock in the prior art are inconvenient to install.

The technical scheme of the utility model is realized as follows:

the utility model aims to provide a three-rod type handle lock, which comprises a bolt assembly, a front cover assembly and a rear cover assembly, wherein the front cover assembly and the rear cover assembly are arranged on two sides of the bolt assembly; the front cover assembly comprises a front cover body, an outer handle which can rotate relative to the front cover body is arranged on the front cover body, a lock cylinder is arranged in the outer handle, a front through block which rotates along with the outer handle and one end of which penetrates through the front cover body is arranged at the inner end of the lock cylinder, a clutch piece is arranged in the front through block, a transmission rod is sleeved in the clutch piece, a locking pressing block is arranged on the transmission rod, and the locking pressing block is positioned in the clutch piece; the rear cover assembly comprises a rear cover body, an inner handle which can rotate relative to the rear cover body is arranged on the rear cover body, a button is arranged in the inner handle, a rear through block which rotates along with the inner handle and one end of which penetrates through the rear cover body is arranged at the inner end of the button, a first linkage block is arranged in the rear through block, the button is movably connected with the first linkage block, a second rotating piece which rotates together with the rear through block is arranged on the rear through block, and a rear reset torsion spring is arranged between the second rotating piece and the rear cover body; the lock tongue assembly comprises a lock tongue body, a transmission sleeve is sleeved in the lock tongue body, one end of a transmission rod is connected with the lock cylinder, and the other end of the transmission rod penetrates through the transmission sleeve, the second rotating piece and the rear through block and then is connected with the first linkage block;

the method is characterized in that: the inboard protrusion of preceding lid has preceding fixed round platform, and preceding fixed round platform indent is equipped with first fixed slot, the inner of preceding logical piece is equipped with first flanging, and the cover is equipped with first commentaries on classics piece on the preceding logical piece, and the one end of first commentaries on classics piece inlays the dress in first fixed slot, installs first jump ring between the other end of first commentaries on classics piece and the first flanging, and first commentaries on classics piece passes through preceding lid and first jump ring axial fixity on the logical piece in the front, and first commentaries on classics piece lateral surface still is equipped with annular first recess, is equipped with the preceding torsional spring that resets between first commentaries on classics piece and the preceding lid, and preceding torsional spring suit that resets is in first recess.

The first rotating part comprises a front rotating pressure plate and a cylindrical front rotating frame, a first clamp spring is clamped between the front rotating pressure plate and a first flanging, a front mounting plate is protruded from one side of the front rotating frame facing to a front cover body and is embedded in a first fixing groove, a first groove is formed between the front mounting plate and the front rotating pressure plate, a plurality of first positioning bulges are protruded from the outer edge of the front mounting plate towards the front rotating pressure plate, a plurality of first positioning bulges are protruded from the periphery of the first groove of the front rotating frame, a plurality of second positioning bulges are protruded from the inner end of the front cover body in the axial direction of the periphery of the front fixing circular truncated cone, one free end of a front reset torsion spring is fixed on the first positioning bulges, the other free end of the front reset torsion spring is fixed on the second positioning bulges, a pair of front clamping blocks is protruded from the inner wall surface of the front rotating frame, and a front avoiding groove corresponding to the front clamping blocks is arranged at the inner end of the front through block, the front clamping block is clamped in the front avoiding groove.

The outer side surface of the front through block is protruded with a ring-shaped front mounting boss, the inner end part of the outer handle is abutted against one side of the front mounting boss, and the front cover body is abutted against the other side of the front mounting boss.

The clutch piece comprises a reverse clutch plate, a second linkage block and a floating block, wherein the second linkage block and the floating block are fixed together, a locking pressing block is positioned between the floating block and the reverse clutch plate, a spiral climbing boss is arranged in the floating block, the locking pressing block moves in the spiral climbing boss, a lug which is arranged corresponding to the front avoiding groove is protruded on the outer side of the second linkage block, the lug penetrates through the front avoiding groove and is clamped on the front rotating frame, and the reverse clutch plate is fixed on the front rotating pressure plate.

The reverse clutch plate is fixed on the front rotary clutch plate, specifically, a first through groove for the reverse clutch plate to pass through is arranged in the front rotary clutch plate, the reverse clutch plate is sleeved in the first through groove, a fixing flanging is protruded on the outer side of the reverse clutch plate and abuts against the front rotary clutch plate, a square groove is formed in the inner side of the reverse clutch plate, the end of the transmission sleeve penetrates through the first through groove and is clamped in the square groove, a pair of second through grooves is further formed in the periphery of the reverse clutch plate of the front rotary clutch plate, and the front through block penetrates through the second through groove.

The aforesaid the inboard protrusion of back lid has the back fixed round platform, and the back fixed round platform indent is equipped with the second fixed slot, the inner that leads to the piece in the back is equipped with the second outward flange, and the second rotating member overlaps on the piece leads to the piece in the back, and the one end card that the second rotated the piece is in the second fixed slot, installs the second jump ring between the other end that the second rotated the piece and the second outward flange, and the second rotated the piece and leads to the piece in the back through lid and second jump ring axial fixity after through, and the second rotated a lateral surface and still is equipped with annular second recess, and back reset torsion spring overlaps in the second recess.

The second rotating part comprises a rear rotating pressing plate and a cylindrical rear rotating frame, the second clamp spring is clamped between the rear rotating pressing plate and a second outer flanging, a rear mounting plate protrudes from one side, facing the front cover body, of the rear rotating frame, the rear mounting plate is embedded in a second fixing groove, a second groove is formed between the rear mounting plate and the rear rotating pressing plate, a plurality of third positioning protrusions protrude from the outer edge of the rear mounting plate towards the rear rotating pressing plate, a plurality of fourth positioning protrusions protrude from the inner end of the rear cover body in the axial direction of the periphery of the rear fixing circular table, one free end of a rear reset torsion spring is fixed on each third positioning protrusion, the other free end of the rear reset torsion spring is fixed on each fourth positioning protrusion, a pair of rear clamping blocks protrude from the inner wall surface of the rear rotating frame, rear avoiding grooves corresponding to the rear clamping blocks are formed in the inner ends of the rear through blocks, and the rear clamping blocks are clamped in the rear avoiding grooves.

The aforesaid back lid includes enclosing cover and inner cup, and the inboard of enclosing cover is equipped with the mounting groove, and the inner cup is installed in the mounting groove, is provided with the sealing washer between the lateral wall of inner cup and the wall of mounting groove, lid including back fixed round platform and the protruding setting of fourth location.

The outer side surface of the rear through block is protruded with an annular rear mounting boss, the inner end part of the inner handle is abutted against one side of the rear mounting boss, and the rear cover body is abutted against the other side of the rear mounting boss.

The lock tongue body is provided with clamping grooves on the upper side and the lower side of the transmission sleeve respectively, the clamping grooves are internally installed on the fixed column, a front fixed hole corresponding to the fixed column is protruded on the periphery of the front fixed circular truncated cone of the front cover body, the end part of the fixed column is in threaded connection with the front fixed hole, a rear fixed hole corresponding to the fixed column is protruded on the periphery of the rear fixed circular truncated cone of the inner cover, and the other end part of the fixed column is clamped in the rear fixed hole.

Compared with the prior art, the utility model has the following advantages:

1. the three-rod type handle lock comprises a lock tongue assembly, a front cover assembly and a rear cover assembly; the front cover assembly comprises a front cover body and an outer handle, a lock core and a front through block are arranged in the outer handle, and a clutch piece and a transmission rod are arranged in the front through block; the rear cover assembly comprises a rear cover body and an inner handle, a button and a rear through block are arranged in the inner handle, and a first linkage block is arranged in the rear through block; one end of the transmission rod is connected with the lock cylinder, and the other end of the transmission rod penetrates through the bolt assembly, the second rotating piece and the rear through block and then is connected with the first linkage block; the inner side of the front cover body is provided with a first fixing groove, the inner end of the front through block is provided with a first flanging, the front through block is sleeved with a first rotating piece, one end of the first rotating piece is embedded in the first fixing groove, a first clamp spring is installed between the other end of the first rotating piece and the first flanging, the outer side surface of the first rotating piece is further provided with a first annular groove, a front reset torsion spring is arranged between the first rotating piece and the front cover body, and the front reset torsion spring is sleeved on the first rotating piece. The first rotating piece is sleeved in the groove, so that the installation is convenient, and the first rotating piece is axially positioned and firmly fixed through the front cover body and the first clamp spring; the front reset torsion spring is sleeved on the first rotating piece, and the installation is convenient.

2. Other advantages of the present invention are described in detail in the examples section.

Drawings

Fig. 1 is a schematic structural view of a three-bar handle lock according to an embodiment of the present invention;

FIG. 2 is a side elevational view of the three bar handle lock;

FIG. 3 is a sectional view taken along line A-A of FIG. 2;

FIG. 4 is an enlarged view of FIG. 3 at B;

FIG. 5 is an enlarged view at C of FIG. 3;

FIG. 6 is a cross-sectional view D-D of FIG. 2;

fig. 7 is an exploded view of a three-bar handle lock;

fig. 8 is an exploded view of a front cover assembly in a three bar handle lock;

fig. 9 is an exploded view of a first rotating member of the three-bar lever handle lock;

FIG. 10 is an exploded view of the clutch member of the three-bar handle lock;

fig. 11 is an exploded view of the rear cover assembly of the three bar handle lock;

FIG. 12 is an exploded view of the second turn piece of the three bar handle lock;

fig. 13 is a schematic structural view of a latch bolt assembly in a three-bar handle lock.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 to 12, the present embodiment provides a three-bar handle lock, which includes a latch bolt assembly 2, and a front cover assembly 1 and a rear cover assembly 3 installed at both sides of the latch bolt assembly 2;

the front cover assembly 1 comprises a front cover body 11, an outer handle 12 which can rotate relative to the front cover body 11 is arranged on the front cover body 11, a lock cylinder 14 is arranged in the outer handle 12, a front through block 13 which rotates along with the outer handle 12 and one end of which penetrates through the front cover body 11 is arranged at the inner end of the lock cylinder 14, a clutch piece 17 is arranged in the front through block 13, a transmission rod 18 is sleeved in the clutch piece 17, a locking pressing block 181 is arranged on the transmission rod 18, and the locking pressing block 181 is positioned in the clutch piece 17;

the rear cover assembly 3 comprises a rear cover body 31, an inner handle 32 which can rotate relative to the rear cover body 31 is arranged on the rear cover body 31, a button 34 is arranged in the inner handle 32, a rear through block 33 which rotates along with the inner handle 32 and one end of which penetrates through the rear cover body 31 is arranged at the inner end of the button 34, a first linkage block 37 is arranged in the rear through block 33, the button 34 is movably connected with the first linkage block 37, a second rotating piece 35 which rotates together with the rear through block 33 is arranged on the rear through block 33, and a rear reset torsion spring 36 is arranged between the second rotating piece 35 and the rear cover body 31;

the bolt assembly 2 comprises a bolt body 21, a transmission sleeve 22 is sleeved in the bolt body 21, one end of a transmission rod 18 is connected with the lock core 14, and the other end of the transmission rod 18 penetrates through the transmission sleeve 22, a second rotating piece 35 and a rear through block 33 and then is connected with a first linkage block 37;

the method is characterized in that: the inner side of the front cover body 11 protrudes with a front fixing circular truncated cone 111, the front fixing circular truncated cone 111 is provided with a first fixing groove 112 in a concave manner, the inner end of the front through block 13 is provided with a first flanging 131, the front through block 13 is sleeved with a first rotating member 15, one end of the first rotating member 15 is embedded in the first fixing groove 112, a first snap spring 151 is installed between the other end of the first rotating member 15 and the first flanging 131, the first rotating member 15 is axially fixed on the front through block 13 through the front cover body 11 and the first snap spring 151, the outer side surface of the first rotating member 15 is further provided with an annular first groove 1521, a front reset torsion spring 16 is arranged between the first rotating member 15 and the front cover body 11, and the front reset torsion spring 16 is sleeved in the first groove 1521.

In the three-rod type handle lock, the first rotating piece 15 is sleeved on the front through block 13, so that the three-rod type handle lock is convenient to install, and the first rotating piece 15 is axially positioned and firmly fixed through the front cover body 13 and the first clamp spring 16; the front reset torsion spring 16 is sleeved on the first rotating member 15, so that the installation is more convenient.

The first rotating member 15 includes a front rotating platen 153 and a cylindrical front rotating frame 152, the first clamp spring 151 is clamped between the front rotating platen 153 and the first outward flange 131, a front mounting plate 1524 protrudes from one side of the front rotating frame 152 facing the front cover 11, the front mounting plate 1524 is embedded in the first fixing groove 112, the first groove 1521 is formed between the front mounting plate 1524 and the front rotating platen 153, a plurality of first positioning protrusions 1522 protrude from the outer edge of the front mounting plate 1524, a plurality of second positioning protrusions 113 axially protrude from the outer periphery of the front fixing circular truncated cone 111 at the inner end of the front cover 11, one free end of the front return torsion spring 16 is fixed on the first positioning protrusion 1522, the other free end of the front return torsion spring 16 is fixed on the second positioning protrusion 113, a pair of front stops 1523 protrude from the inner wall of the front rotating frame 152, a front clearance groove 133 corresponding to the front stops 1523 is arranged at the inner end of the front through block 13, the front clamping block 1523 is clamped in the front avoiding groove 133. The first rotating piece 15 is simple and compact in structure, the first rotating piece 15 is fixed in the circumferential direction by the matching of the front clamping block 1523 and the front avoiding groove 133, and the first rotating piece 15 and the front through block 13 rotate together; the first recess 1521 further facilitates the securement of the front return torsion spring 16.

An annular front mounting boss 132 protrudes from the outer side surface of the front through block 13, the inner end of the outer handle 12 abuts against one side of the front mounting boss 132, and the front cover 11 abuts against the other side of the front mounting boss 132. The front mounting boss 132 facilitates axial fixation of the outer handle 12 and the front cover 11.

The clutch member 17 includes a reverse clutch plate 173, and a second coupling block 171 and a floating block 172 fixed together, the locking pressing block 181 is located between the floating block 172 and the reverse clutch plate 173, a spiral climbing boss 1721 is provided in the floating block 172, the locking pressing block 231 moves in the spiral climbing boss 1721, a lug 1711 corresponding to the front avoiding groove 133 is protruded outside the second coupling block 171, the lug 1711 passes through the front avoiding groove 133 and is clamped on the front rotating frame 152, and the reverse clutch plate 173 is fixed on the front rotating plate 172. The clutch member 17 has a simple structure and is convenient to install.

The reverse clutch plate 173 is fixed on the front rotary clutch plate 153, specifically, a first through groove 1531 for the reverse clutch plate 173 to pass through is arranged in the front rotary clutch plate 153, the reverse clutch plate 173 is sleeved in the first through groove 1531, a fixing flange 1732 protrudes from the outer side of the reverse clutch plate 173, the fixing flange 1732 abuts against the front rotary clutch plate 153, a square groove 1731 is arranged on the inner side of the reverse clutch plate 173, the end of the transmission sleeve 22 passes through the first through groove 1531 and is clamped in the square groove 1731, a pair of second through grooves 1532 is further arranged on the periphery of the reverse clutch plate 173 of the front rotary clutch plate 153, and the front through block 13 passes through the second through groove 1532. The engagement of the front rotary pressure plate 153 with the reverse clutch plate 173 makes the structure of the front cover assembly 1 more compact.

The aforesaid inboard protrusion of back lid 31 has back fixed round platform 311, and back fixed round platform 311 indent is equipped with second fixed slot 312, the inner of back logical piece 33 is equipped with second flanging 331, and second rotates the piece 35 cover on the piece 33 that leads to in the back, and the one end card of second rotation piece 35 is in second fixed slot 312, installs second jump ring 351 between the other end of second rotation piece 35 and the second flanging 331, and second rotation piece 35 passes through back lid 31 and second jump ring 351 axial fixation on the piece 33 that leads to in the back, and second rotation piece 35 lateral surface still is equipped with annular second recess 3521, and back reset torsion spring 36 overlaps in second recess 3521. The second rotating part 35 is convenient to mount, and the second rotating part 35 is axially positioned through the rear cover body 31 and the second clamp spring 351 and is firmly fixed; the rear return torsion spring 36 is more convenient to install.

The second rotating member 35 includes a rear rotating pressing plate 353 and a cylindrical rear rotating frame 352, the rear rotating frame 352 is sleeved on the rear through block 35, the second snap spring 351 is clamped between the rear rotating pressing plate 353 and the second outward flange 331, a rear mounting plate 3524 is protruded from one side of the rear rotating frame 352 facing the front cover 11, the rear mounting plate 3524 is embedded in the second fixing groove 312, the second groove 3521 is formed between the rear mounting plate 3524 and the rear rotating pressing plate 353, a plurality of third positioning protrusions 3522 are protruded from the outer edge of the rear mounting plate 3524 toward the rear rotating pressing plate 353, a plurality of fourth positioning protrusions 313 are protruded axially from the periphery of the rear fixing circular truncated cone 311 at the inner end of the rear cover 31, one free end of the rear return torsion spring 36 is fixed on the third positioning protrusion 3522, the other free end of the rear return torsion spring 36 is fixed on the fourth positioning protrusions 313, a pair of rear clamping blocks 3523 are protruded from the inner wall surface of the rear rotating frame 352, the inner end of the rear through block 33 is provided with a rear avoiding groove 333 which is arranged corresponding to the rear clamping block 3523, and the rear clamping block 3523 is clamped in the rear avoiding groove 333. The cooperation of the rear latch 3523 and the rear clearance groove 333 allows the second rotating member 35 to rotate together with the rear through block 35.

The rear cover body 31 includes an outer cover 314 and an inner cover 315, wherein an installation groove 3141 is formed in the inner side of the outer cover 314, the inner cover 315 is installed in the installation groove 3141, a sealing ring 316 is disposed between the outer side wall of the inner cover 315 and the wall surface of the installation groove 3141, and the rear fixing circular truncated cone 311 and the fourth positioning protrusion 313 are disposed on the inner cover 315.

An annular rear mounting boss 332 protrudes from the outer side surface of the rear through block 33, the inner end of the inner handle 32 abuts against one side of the rear mounting boss 332, and the rear cover 31 abuts against the other side of the rear mounting boss 332. The rear mounting boss 332 further facilitates the fixing of the inner handle 32 and the rear cover 31.

The lock tongue body 21 is provided with a locking groove 211 at the upper side and the lower side of the transmission sleeve 22, the locking groove 211 is internally provided with a fixed column 24, the front cover body 11 is provided with a front fixing hole 114 protruding on the periphery of the front fixing circular truncated cone 111 and corresponding to the fixed column 24, the end part of the fixed column 24 is in threaded connection with the front fixing hole 114, the inner cover 315 is provided with a rear fixing hole 317 protruding on the periphery of the rear fixing circular truncated cone 311 and corresponding to the fixed column 24, and the other end part of the fixed column 24 is clamped in the rear fixing hole 317. The bolt assembly 2 is convenient to assemble.

According to the three-rod type handle lock, the structures of the front through block 13, the first rotating piece 15, the rear through block 33, the second rotating piece 35 and the like are improved, so that the components are assembled more quickly and conveniently, the structure is more compact, and the connection is more reliable.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. A three-rod handle lock comprises a bolt assembly (2), a front cover assembly (1) and a rear cover assembly (3) which are arranged on two sides of the bolt assembly (2);

the front cover assembly (1) comprises a front cover body (11), an outer handle (12) capable of rotating relative to the front cover body is arranged on the front cover body (11), a lock cylinder (14) is arranged in the outer handle (12), a front through block (13) which rotates along with the outer handle (12) and one end of which penetrates through the front cover body (11) is arranged at the inner end of the lock cylinder (14), a clutch piece (17) is arranged in the front through block (13), a transmission rod (18) is sleeved in the clutch piece (17), a locking pressing block (181) is arranged on the transmission rod (18), and the locking pressing block (181) is positioned in the clutch piece (17);

the rear cover assembly (3) comprises a rear cover body (31), an inner handle (32) capable of rotating relative to the rear cover body (31) is arranged on the rear cover body (31), a button (34) is arranged in the inner handle (32), the inner end of the button (34) is provided with a rear through block (33) which rotates along with the inner handle (32) and one end of which penetrates through the rear cover body (31), a first linkage block (37) is arranged in the rear through block (33), the button (34) is movably connected with the first linkage block (37), a second rotating piece (35) which rotates together with the rear through block (33) is installed on the rear through block (33), and a rear reset torsion spring (36) is arranged between the second rotating piece (35) and the rear cover body (31);

the bolt assembly (2) comprises a bolt body (21), a transmission sleeve (22) is sleeved in the bolt body (21), one end of a transmission rod (18) is connected with the lock core (14), and the other end of the transmission rod (18) penetrates through the transmission sleeve (22), a second rotating piece (35) and a rear through block (33) and then is connected with a first linkage block (37);

the method is characterized in that: the inner side of the front cover body (11) protrudes with a front fixing circular truncated cone (111), the front fixing circular truncated cone (111) is provided with a first fixing groove (112) in a concave mode, the inner end of the front through block (13) is provided with a first flanging (131), the front through block (13) is sleeved with a first rotating piece (15), one end of the first rotating piece (15) is embedded into the first fixing groove (112), a first clamping spring (151) is installed between the other end of the first rotating piece (15) and the first flanging (131), the first rotating piece (15) is axially fixed on the front through block (13) through the front cover body (11) and the first clamping spring (151), an annular first groove (1521) is further formed in the outer side face of the first rotating piece (15), a front reset torsion spring (16) is arranged between the first rotating piece (15) and the front cover body (11), and the front reset torsion spring (16) is sleeved in the first groove (1521).

2. A three bar handle lock as defined in claim 1, wherein: the first rotating member (15) comprises a front rotating pressure plate (153) and a cylindrical front rotating frame (152), a first clamp spring (151) is clamped between the front rotating pressure plate (153) and a first flanging (131), a front mounting plate (1524) protrudes from one side of the front rotating frame (152) facing the front cover body (11), the front mounting plate (1524) is embedded in the first fixing groove (112), a first groove (1521) is formed between the front mounting plate (1524) and the front rotating pressure plate (153), a plurality of first positioning bulges (1522) protrude from the outer edge of the front mounting plate (1524) to the front rotating pressure plate (153), a plurality of second positioning bulges (113) axially protrude from the periphery of the front fixing circular table (111) at the inner end of the front cover body (11), one free end of the front reset torsion spring (16) is fixed on the first positioning bulge (1522), and the other free end of the front reset torsion spring (16) is fixed on the second positioning bulges (113), a pair of front clamping blocks (1523) protrude from the inner wall surface of the front rotating frame (152), front avoiding grooves (133) which are arranged corresponding to the front clamping blocks (1523) are formed in the inner ends of the front through blocks (13), and the front clamping blocks (1523) are clamped in the front avoiding grooves (133).

3. A three bar handle lock according to claim 2, wherein: an annular front mounting boss (132) protrudes from the outer side surface of the front through block (13), the inner end of the outer handle (12) abuts against one side of the front mounting boss (132), and the front cover body (11) abuts against the other side of the front mounting boss (132).

4. A three bar handle lock as defined in claim 3, wherein: the clutch piece (17) comprises a reverse clutch plate (173), a second coupling block (171) and a floating block (172) which are fixed together, a locking pressing block (181) is positioned between the floating block (172) and the reverse clutch plate (173), a spiral climbing boss (1721) is arranged in the floating block (172), the locking pressing block (181) moves in the spiral climbing boss (1721), a lug (1711) which corresponds to the front avoiding groove (133) protrudes from the outer side of the second coupling block (171), the lug (1711) penetrates through the front avoiding groove (133) and is clamped on the front rotating frame (152), and the reverse clutch plate (173) is fixed on the front rotating clutch plate (153).

5. The three-bar handle lock of claim 4, wherein: the reverse clutch plate (173) is fixed on the front rotary press plate (153), specifically, a first through groove (1531) for the reverse clutch plate (173) to pass through is arranged in the front rotary press plate (153), the reverse clutch plate (173) is sleeved in the first through groove (1531), a fixing flange (1732) protrudes from the outer side of the reverse clutch plate (173), the fixing flange (1732) abuts against the front rotary press plate (153), a square groove (1731) is arranged on the inner side of the reverse clutch plate (173), the end of the transmission sleeve (22) passes through the first through groove (1531) and is clamped in the square groove (1731), a pair of second through grooves (1532) is further arranged on the periphery of the reverse clutch plate (173), and the front through block (13) passes through the second through groove (1532).

6. A three bar handle lock as claimed in any one of claims 1 to 5, wherein: the inboard protrusion of back lid (31) has back fixed round platform (311), and back fixed round platform (311) indent is equipped with second fixed slot (312), the inner that leads to piece (33) back is equipped with second flanging (331), and second rotates piece (35) cover on lead to piece (33) back, and the one end card that the second rotated piece (35) is in second fixed slot (312), and second jump ring (351) are installed to the other end that the second rotated piece (35) and second flanging (331) between, and second rotates piece (35) through back lid (31) and second jump ring (351) axial fixity on leading to piece (33) back, and second rotates piece (35) lateral surface still is equipped with annular second recess (3521), and back reset torsion spring (36) cover is in second recess (3521).

7. The three-bar handle lock of claim 6, wherein: the second rotating part (35) comprises a rear rotating pressing plate (353) and a cylindrical rear rotating frame (352), the second clamping spring (351) is clamped between the rear rotating pressing plate (353) and a second flanging (331), a rear mounting plate (3524) protrudes from one side of the rear rotating frame (352) facing the front cover body (11), the rear mounting plate (3524) is embedded in the second fixing groove (312), a second groove (3521) is formed between the rear mounting plate (3524) and the rear rotating pressing plate (353), a plurality of third positioning bulges (3522) protrude from the outer edge of the rear mounting plate (3524) towards the rear rotating pressing plate (353), a plurality of fourth positioning bulges (313) axially protrude from the periphery of the rear fixing circular truncated cone (311) at the inner end of the rear cover body (31), one free end of the rear resetting torsion spring (36) is fixed on the third positioning bulges (3522), and the other free end of the rear resetting torsion spring (36) is fixed on the fourth positioning bulges (313), a pair of rear clamping blocks (3523) protrude from the inner wall surface of the rear rotating frame (352), rear avoiding grooves (333) which correspond to the rear clamping blocks (3523) are formed in the inner ends of the rear through blocks (33), and the rear clamping blocks (3523) are clamped in the rear avoiding grooves (333).

8. The three-bar handle lock of claim 7, wherein: the rear cover body (31) comprises an outer cover (314) and an inner cover (315), a mounting groove (3141) is formed in the inner side of the outer cover (314), the inner cover (315) is mounted in the mounting groove (3141), a sealing ring (316) is arranged between the outer side wall of the inner cover (315) and the wall surface of the mounting groove (3141), and the rear fixing circular truncated cone (311) and the fourth positioning protrusion (313) are arranged on the inner cover (315).

9. The three-bar handle lock of claim 8, wherein: an annular rear mounting boss (332) protrudes from the outer side surface of the rear through block (33), the inner end of the inner handle (32) abuts against one side of the rear mounting boss (332), and the rear cover body (31) abuts against the other side of the rear mounting boss (332).

10. A three bar handle lock as defined in claim 9, wherein: the lock tongue body (21) is provided with clamping grooves (211) on the upper side and the lower side of the transmission sleeve (22) respectively, the clamping grooves (211) are internally installed on the fixing column (24), a front fixing hole (114) which is correspondingly arranged with the fixing column (24) protrudes out of the periphery of the front fixing circular truncated cone (111) of the front cover body (11), the end part of the fixing column (24) is in threaded connection with the front fixing hole (114), a rear fixing hole (317) which is correspondingly arranged with the fixing column (24) protrudes out of the periphery of the rear fixing circular truncated cone (311) of the inner cover (315), and the other end part of the fixing column (24) is clamped in the rear fixing hole (317).

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