CN219659203U - System cabinet convenient to overhaul - Google Patents

Abstract

The utility model relates to a system cabinet convenient to overhaul, which comprises a system cabinet and a cabinet door, wherein the cabinet door is rotationally connected to the system cabinet, a mounting plate is slidably matched in the system cabinet, the mounting plate is used for mounting equipment, a side door is arranged at the position of the system cabinet corresponding to the mounting plate, a locking piece for locking the side door is arranged on the system cabinet, a limiting assembly is arranged on the system cabinet, the limiting assembly comprises a propping block, an ejection spring and a limiting block, a mounting groove is arranged on the mounting plate, the propping block is slidably matched in the mounting groove, the limiting block is connected to the propping block, the position of the mounting groove corresponding to the limiting block is provided with a limiting groove, the limiting block is slidably matched in the limiting groove, the ejection spring is arranged in the mounting groove and is positioned between the propping block and the bottom wall of the mounting groove, the ejection spring is in a pressed state, and the propping groove is arranged on the system cabinet. The utility model has the effect of improving the overhaul efficiency of the system cabinet.

Description

System cabinet convenient to overhaul

Technical Field

The utility model relates to a system cabinet, in particular to a system cabinet convenient to overhaul.

Background

The automatic control system cabinet is characterized in that a switching device, a measuring instrument and protection appliances are assembled in a closed or semi-closed metal cabinet according to the electric wiring requirement, and the arrangement of the automatic controller and auxiliary equipment meets the requirements of normal operation and automatic control of an electric power system, so that the automatic control system cabinet is convenient for normal operation and does not endanger the safety of personnel and surrounding equipment. The internal equipment of the automatic control system cabinet runs for a long time and has the possibility of faults, so that the internal equipment needs to be overhauled regularly.

The chinese patent with the bulletin number of CN210328296U discloses an autonomous system cabinet convenient to overhaul, which comprises a cabinet body, cabinet door is installed in one side rotation of the cabinet body, cabinet internal fixed mounting has the baffle, the top fixed mounting of baffle has the montant, the top fixed mounting of montant is on the top inner wall of the cabinet body, the cabinet internal is equipped with the slide, the through-hole has been seted up at the top of slide, the montant runs through the through-hole, all seted up the spout on the both sides inner wall of through-hole, equal slidable mounting has the slider in two spouts, one side that two sliders kept away from each other extends to outside corresponding spout respectively, one side that two sliders kept away from each other is all nested to have the ball, one side that two sliders kept away from each other is all fixed mounting has the spring. The utility model has reasonable design, strong usability and convenient operation, is convenient for adjusting the height position and the horizontal position of the bulb, utilizes the bulb to conveniently illuminate different positions in the cabinet body, is convenient for overhauling work of overhaulers, and improves the working efficiency.

To above-mentioned related art, among the prior art staff utilize the bulb to shine the internal portion of cabinet, provide good field of vision environment for staff's maintenance internal equipment, nevertheless the staff need overhaul the equipment in the internal portion of cabinet, the working range is narrower, it utilizes instrument handling equipment to have influenced the staff, if need load and unload the great and noble equipment of weight in the internal portion of cabinet, the staff is difficult to utilize hoist lifting device to hoist equipment, the maintenance degree of difficulty of heavier equipment has been increased again in the internal portion of cabinet, the loading and unloading safety risk of heavier equipment has also been increased simultaneously, the maintenance of internal portion equipment of cabinet brings inconvenience, the maintenance time of system cabinet has been prolonged, maintenance efficiency of system cabinet has been reduced.

Disclosure of Invention

In order to improve the overhaul efficiency of the system cabinet, the utility model provides the system cabinet convenient to overhaul.

The utility model provides a system cabinet convenient to overhaul, which adopts the following technical scheme:

the utility model provides a system cabinet convenient to overhaul, includes system cabinet and cabinet door, the cabinet door rotates to be connected on the system cabinet, sliding fit has the mounting panel in the system cabinet, the mounting panel is used for erection equipment, the system cabinet corresponds the position department of mounting panel is opened there is the side door, be provided with the locking on the system cabinet the retaining member of side door, be provided with the restriction subassembly on the system cabinet, the restriction subassembly is including supporting tight piece, ejection spring and restriction piece, it has the mounting groove to open on the mounting panel, it is in to support tight piece sliding fit in the mounting groove, the restriction piece is connected on the supporting tight piece, the mounting groove corresponds the position department of restriction piece is opened there is the restriction groove, the notch department of restriction groove is connected with the shutoff piece, restriction piece sliding fit is in the restriction inslot, ejection spring sets up in the mounting groove, and be located support tight piece with between the diapire of mounting groove, ejection spring is the pressurized state, it supports tight groove to open on the system cabinet, when the system cabinet, the system is moved out to support tight piece, the mounting panel supports tightly groove.

By adopting the technical scheme, when the system cabinet is overhauled, a worker releases the locking piece, opens the side door, pulls the mounting plate to move outwards of the system cabinet until the abutting block reaches the abutting groove, and moves under the action of the ejection spring until the limiting block abuts against the plugging block, and the abutting block partially moves out of the mounting groove and enters the abutting groove, and the abutting block abuts against the side wall of the abutting groove so as to limit the travel of the mounting plate, so that the system cabinet can be overhauled; after the overhaul is finished, the staff pushes the abutting block to enable the abutting block to enter the mounting groove, the ejection spring is compressed, the mounting plate is moved reversely immediately until the mounting plate completely enters the system cabinet, the side door is closed, the side door is locked by the locking piece, and the follow-up work of the overhaul system cabinet is completed. The staff removes the mounting panel part out the system cabinet, makes the equipment on the mounting panel move out the system cabinet, and the staff alright utilize the hoist to hoist heavier equipment, makes the staff conveniently carry out loading and unloading to heavier equipment, has reduced the loading and unloading degree of difficulty of heavier equipment, and has reduced the loading and unloading safety risk of heavier equipment to this has shortened the maintenance time of system cabinet, has improved the maintenance efficiency of system cabinet.

Optionally, the system cabinet is connected with the movable rail in the position department that corresponds to the mounting panel, the mounting panel corresponds the position department of movable rail is opened has the movable groove, the mounting panel passes through the movable groove sliding fit is in on the movable rail.

Through adopting above-mentioned technical scheme, the staff has utilized the cooperation of movable rail and movable groove to restrict the direction of movement of mounting panel, has reduced the mounting panel and has taken place the possibility of skew when removing, and has improved the bearing stability of mounting panel.

Optionally, a plurality of balls are connected to the moving rail along the length direction thereof, and the balls are abutted against the bottom wall of the moving groove.

Through adopting above-mentioned technical scheme, the sliding fit of mounting panel and movable rail is sliding friction, and frictional force is great, brings inconvenience for the staff pulling installation door. The staff utilizes the ball to make sliding friction become rolling friction, has reduced the frictional force between mounting panel and the movable rail, has made things convenient for the staff to pull the installing door.

Optionally, be provided with on the mounting panel and assist and prop the mechanism, assist and prop the mechanism and include assisting vaulting pole, fixed disk and support tight subassembly, assist the vertical sliding fit of vaulting pole and be in on the mounting panel, the fixed disk is connected assist the bottom of vaulting pole, support tight subassembly setting and be in on the mounting panel, support tight subassembly and be used for locking assist the vaulting pole.

Through adopting above-mentioned technical scheme, when assisting and propping the mounting panel, the staff will assist the vaulting pole and put down until the fixed disk contradicts ground, and the tight subassembly of recycling supports tightly and assists the vaulting pole to stabilize and assist the vaulting pole, realized assisting the effect of propping the mounting panel.

Optionally, support tight subassembly includes the clamp plate, supports tight board, supports tight spring and connecting rod, it has pressing groove and extrusion groove to open on the mounting panel, pressing groove with extrusion groove sets up relatively, press the board sliding fit and be in the pressing groove, support tight board sliding fit and be in the extrusion groove, support tight board laminating assist the vaulting pole, the connecting rod be in press the clamp plate with support and connect a plurality of roots between the tight board, the connecting rod with mounting panel sliding fit, support tight spring cover and establish on the connecting rod, and be located press the clamp plate with press between the diapire in groove, support tightly when assisting the vaulting pole, support tight board support tightly assist the vaulting pole, support tight spring is the pressurized state.

Through adopting above-mentioned technical scheme, when assisting and propping the mounting panel, the staff presses the clamp plate, makes the connecting rod remove, drives to support tight board and removes, supports tight spring and receives the compression, and auxiliary stay falls down because of gravity until the fixed disk contradicts ground, loosens the clamp plate, and the clamp plate receives to support tight spring effort reverse movement, drives to support tight board reverse movement, until support tight board and support tight auxiliary stay, has realized the effect of assisting and propping the mounting panel.

Optionally, the tight board is connected with and supports tight tooth, the auxiliary stay pole is close to support and be connected with the fixed tooth on the lateral wall of tight board, support tight tooth with the fixed tooth meshing.

Through adopting above-mentioned technical scheme, the staff utilizes to support tight tooth and the cooperation of fixed tooth to support tightly the auxiliary stay, makes auxiliary stay by supporting tightly more firm, has reduced the possibility that auxiliary stay removed.

Optionally, the mounting panel corresponds open on the side of side door has the standing groove, be provided with flexible handle in the standing groove, flexible handle includes movable rod and telescopic link, the telescopic link is in two of horizontal connection in the standing groove, the movable rod is connected two between the telescopic link, when flexible handle shrink, flexible handle is located in the standing groove.

By adopting the technical scheme, the staff pulls the installation door by using the telescopic handle, so that the staff pulls the installation door more easily.

Optionally, the locking member is a latch.

Through adopting above-mentioned technical scheme, the staff utilizes bolt locking side door, and easy operation, swift makes the side door can be opened and shut fast.

In summary, the present utility model includes at least one of the following beneficial technical effects:

1. when the system cabinet is overhauled, a worker releases the locking piece, opens the side door, pulls the mounting plate to move outwards of the system cabinet until the abutting block reaches the abutting groove, and moves under the action of the ejection spring until the limiting block abuts against the plugging block, and the abutting block partially moves out of the mounting groove and enters the abutting groove, and the abutting block abuts against the side wall of the abutting groove to limit the travel of the mounting plate, so that the system cabinet can be overhauled; after the overhaul is finished, the staff pushes the abutting block to enable the abutting block to enter the mounting groove, the ejection spring is compressed, the mounting plate is moved reversely immediately until the mounting plate completely enters the system cabinet, the side door is closed, the side door is locked by the locking piece, and the follow-up work of the overhaul system cabinet is completed. The staff removes the mounting plate part out of the system cabinet, so that the equipment on the mounting plate is moved out of the system cabinet, the staff can hoist the heavier equipment by using the lifting appliance, so that the staff can conveniently load and unload the heavier equipment, the loading and unloading difficulty of the heavier equipment is reduced, and the loading and unloading safety risk of the heavier equipment is reduced, thereby shortening the overhaul time of the system cabinet and improving the overhaul efficiency of the system cabinet;

2. when supporting the mounting panel, the staff presses the pressing plate, makes the connecting rod remove, drives to support tight board and removes, supports tight spring and receives the compression, and auxiliary stay falls because of gravity down, until the fixed disk is contradicted ground, loosens the pressing plate, and the pressing plate receives to support tight spring effort reverse movement, drives to support tight board reverse movement, until support tight board and support the tight auxiliary stay, has realized the effect of supporting the mounting panel.

Drawings

Fig. 1 is a schematic diagram of the overall structure of a system cabinet which is convenient to overhaul in the embodiment of the utility model.

Fig. 2 is a schematic structural diagram of a system cabinet maintenance state in an embodiment of the present utility model.

FIG. 3 is a cross-sectional view of a structure embodying a restraining assembly in accordance with an embodiment of the utility model.

Fig. 4 is a cross-sectional view of an embodiment of the present utility model for embodying the construction of the abutment assembly.

Fig. 5 is a cross-sectional view of an embodiment of the present utility model for embodying a telescoping handle structure.

Reference numerals illustrate: 1. a system cabinet; 11. a cabinet door; 12. a side door; 13. a locking member; 14. a moving rail; 15. a ball; 16. a tightening groove; 2. a mounting plate; 21. a mounting groove; 22. a limiting groove; 23. a block; 24. a pressing groove; 25. an extrusion groove; 26. a placement groove; 27. a telescoping handle; 271. a moving rod; 272. a telescopic rod; 3. a restriction assembly; 31. a tightening block; 311. an inclined plane; 32. an ejector spring; 33. a limiting block; 4. an auxiliary supporting mechanism; 41. an auxiliary stay bar; 411. a fixed tooth; 42. a fixed plate; 43. a tightening assembly; 431. pressing the plate; 432. a pressing plate; 4321. abutting the teeth; 433. a spring is abutted tightly; 434. and (5) connecting a rod.

Detailed Description

The utility model is described in further detail below with reference to fig. 1-5.

The embodiment of the utility model discloses a system cabinet convenient to overhaul. Referring to fig. 1 and 2, a system cabinet for easy maintenance includes a system cabinet 1 and a cabinet door 11, wherein the cabinet door 11 is connected to the system cabinet 1 through a hinge. The system cabinet 1 is slidably matched with the mounting plate 2, the side door 12 is connected to the position of the system cabinet 1 corresponding to the mounting plate 2 through a hinge, and a locking piece 13 for locking the side door 12 on the system cabinet 1 is arranged on the side door 12. The mounting plate 2 is used for mounting equipment, and the limiting component 3 for limiting the moving stroke of the mounting plate 2 is arranged on the mounting plate 2, and the auxiliary supporting mechanism 4 for auxiliary supporting the mounting plate 2 is also arranged on the mounting plate 2.

When the system cabinet 1 is overhauled, a worker releases the locking piece 13, opens the side door 12, pulls the mounting plate 2 to the designated position, limits the mounting plate 2 to move continuously by using the limiting assembly 3, and supports the mounting plate 2 by using the auxiliary supporting mechanism 4 in an auxiliary mode, so that the system cabinet 1 can be overhauled.

Referring to fig. 1, the locking member 13 may be a latch, and the locking member 13 is fixedly coupled to the side door 12.

Referring to fig. 2, the system cabinet 1 is fixedly connected with a moving rail 14 at positions corresponding to the top edge and the bottom edge of the mounting plate 2, a plurality of balls 15 are embedded in the moving rail 14 along the length direction of the moving rail, a moving groove is formed in the position, corresponding to the moving rail 14, of the mounting plate 2, the bottom wall of the mounting groove 21 abuts against the balls 15, and the mounting plate 2 is in sliding fit on the moving rail 14 through the moving groove. The cooperation of the balls 15 with the moving rail 14 makes the mounting plate 2 more convenient to be pulled out.

Referring to fig. 3, the limiting assembly 3 includes an abutment block 31, an ejector spring 32, and a limiting block 33. The mounting plate 2 is provided with a mounting groove 21 at the bottom edge, the abutting block 31 is slidably matched in the mounting groove 21, an inclined surface 311 is arranged on the abutting block 31, and the thickness of the abutting block 31 is gradually increased from the lowest part of the abutting block 31 to the bottom wall of the mounting groove 21 as a reference direction. The limiting block 33 is fixedly connected to the abutting block 31, the limiting groove 22 is formed in the position, corresponding to the limiting block 33, of the mounting groove 21, the blocking block 23 is fixedly connected to the notch of the limiting groove 22, and the limiting block 33 is in sliding fit in the limiting groove 22. The ejector spring 32 is disposed in the mounting groove 21 and between the abutting block 31 and the bottom wall of the mounting groove 21, and the ejector spring 32 is in a pressed state in an initial state. The system cabinet 1 is provided with a tightening groove 16 at a position corresponding to the tightening block 31.

When the equipment on the mounting plate 2 moves out of the system cabinet 1, the abutting block 31 moves under the action of the ejector spring 32 until the limiting block 33 abuts against the plugging block 23, the abutting block 31 partially moves out of the mounting groove 21 and enters the abutting groove 16, and the abutting block 31 abuts against the side wall of the abutting groove 16, so that the effect of limiting the continuous movement of the mounting plate 2 is achieved.

Referring to fig. 2 and 4, the auxiliary stay mechanism 4 includes an auxiliary stay 41, a fixed plate 42, and a tightening assembly 43. The auxiliary stay bar 41 is vertically in sliding fit at the corner, close to the mounting plate 2, on the bottom edge of the mounting plate 2, and the fixed disc 42 is fixedly connected to the bottom end of the auxiliary stay bar 41. The abutment assembly 43 includes a pressing plate 431, an abutment plate 432, an abutment spring 433 and a connecting rod 434. The mounting plate 2 is provided with a pressing groove 24 and a pressing groove 25 at positions corresponding to the auxiliary supporting rods 41, and the pressing groove 24 and the pressing groove 25 are oppositely arranged. The pressing plate 431 is slidably fitted in the pressing groove 24, the abutting plate 432 is slidably fitted in the pressing groove 25, and the connecting rods 434 are fixedly connected between the pressing plate 431 and the abutting plate 432, in this embodiment, four connecting rods 434 are slidably fitted with the mounting plate 2. The abutting spring 433 is sleeved on the connecting rod 434 and is positioned between the pressing plate 431 and the bottom wall of the pressing groove 24, and the abutting spring 433 is in a compressed state. The side wall of the abutting plate 432, which is close to the auxiliary stay bar 41, is fixedly connected with a plurality of abutting teeth 4321, the side wall of the auxiliary stay bar 41, which corresponds to the abutting teeth 4321, is fixedly connected with fixed teeth 411, and the abutting teeth 4321 are meshed with the fixed teeth 411.

When the mounting plate 2 is supported, after the mounting plate 2 is pulled to a designated position by a worker, the pressing plate 431 is pressed, so that the connecting rod 434 is moved to drive the abutting plate 432 to move, the abutting teeth 4321 are separated from the fixed teeth 411, the auxiliary supporting rod 41 falls down due to gravity until the fixed disc 42 abuts against the ground, the pressing plate 431 is loosened, the pressing plate 431 is reversely moved by the acting force of the abutting spring 433 to drive the abutting plate 432 to reversely move, the abutting teeth 4321 are meshed with the fixed teeth 411 to stabilize the auxiliary supporting rod 41, and the effect of the auxiliary mounting plate 2 is achieved.

Referring to fig. 5, in order to facilitate the operator to pull the mounting plate 2, a placement groove 26 is formed in the side edge of the mounting plate 2, a telescopic handle 27 is arranged in the placement groove 26, the telescopic handle 27 comprises two movable rods 271 and two telescopic rods 272, the two telescopic rods 272 are horizontally arranged, the telescopic rods 272 are fixedly connected in the placement groove 26, the movable rods 271 are fixedly connected between the two telescopic rods 272, and in an initial state, the movable rods 271 are positioned in the placement groove 26.

The implementation principle of the system cabinet convenient to overhaul provided by the embodiment of the utility model is as follows: when the system cabinet 1 is overhauled, a worker releases the locking piece 13, opens the side door 12, pulls the movable rod 271 to enable the mounting plate 2 to move until equipment on the mounting plate 2 moves out of the system cabinet 1, the abutting block 31 moves under the action of the ejection spring 32 until the limiting block 33 abuts against the plugging block 23, part of the abutting block 31 moves out of the mounting groove 21 and enters the abutting groove 16, the abutting block 31 abuts against the side wall of the abutting groove 16, then the pressing plate 431 is pressed to enable the connecting rod 434 to move to drive the abutting plate 432 to move, the abutting tooth 4321 is separated from the fixed tooth 411, the auxiliary supporting rod 41 falls down due to gravity until the fixed disc 42 abuts against the ground, the pressing plate 431 is loosened, the pressing plate 431 is reversely moved under the action of the abutting spring 433, the abutting plate 432 is driven to reversely move, the abutting tooth 4321 is meshed with the fixed tooth 411, so that the auxiliary supporting rod 41 is stabilized, and then overhauling equipment is started; after the equipment maintenance is finished, the pressing plate 431 is pressed, the auxiliary supporting rod 41 is lifted until the auxiliary supporting rod 41 is immersed into the mounting plate 2, the pressing plate 431 is loosened, the mounting plate 2 is pushed, the inclined surface 311 is abutted against the edge of the abutting groove 16, the abutting block 31 enters the mounting groove 21, the ejection spring 32 is compressed until the mounting plate 2 completely enters the system cabinet 1, the side door 12 is closed, and the locking piece 13 is locked, so that the system cabinet 1 can be started.

The staff removes the mounting panel 2 part out system cabinet 1, makes the equipment on the mounting panel 2 move out system cabinet 1, and the staff alright utilize the hoist to hoist heavier equipment, makes the staff conveniently load and unload heavier equipment, has reduced the loading and unloading degree of difficulty of heavier equipment, and has reduced the loading and unloading safety risk of heavier equipment to this has shortened the maintenance time of system cabinet 1, has improved the maintenance efficiency of system cabinet 1.

The above embodiments are not intended to limit the scope of the present utility model, so: all equivalent changes in structure, shape and principle of the utility model should be covered in the scope of protection of the utility model.

Claims (8)

1. The utility model provides a system cabinet convenient to overhaul which characterized in that: the system comprises a system cabinet (1) and a cabinet door (11), wherein the cabinet door (11) is rotatably connected to the system cabinet (1), a mounting plate (2) is slidably matched with the system cabinet (1), the mounting plate (2) is used for mounting equipment, a side door (12) is arranged at the position of the system cabinet (1) corresponding to the mounting plate (2), a locking piece (13) for locking the side door (12) is arranged on the system cabinet (1), a limiting assembly (3) is arranged on the system cabinet (1), the limiting assembly (3) comprises a supporting block (31), an ejection spring (32) and a limiting block (33), a mounting groove (21) is arranged on the mounting plate (2), the supporting block (31) is slidably matched in the mounting groove (21), the limiting block (33) is connected to the supporting block (31), a limiting groove (22) is arranged at the position of the limiting groove (22) corresponding to the limiting block (33), a notch of the limiting groove (22) is connected with the limiting block (23), the supporting block (31) is arranged in the sliding block (21) and is arranged in the limiting block (21), the ejection spring (32) is in a pressed state, the system cabinet (1) is provided with a propping groove (16), when the system cabinet (1) is overhauled, the mounting plate (2) is partially moved out of the system cabinet (1), and the propping block (31) is propped against the groove wall of the propping groove (16).

2. A system cabinet for easy access according to claim 1, wherein: the system cabinet (1) is connected with a moving rail (14) at the position corresponding to the mounting plate (2), a moving groove is formed in the position, corresponding to the moving rail (14), of the mounting plate (2), and the mounting plate (2) is in sliding fit with the moving rail (14) through the moving groove.

3. A system cabinet for easy access as defined in claim 2, wherein: the movable rail (14) is connected with a plurality of balls (15) along the length direction of the movable rail, and the balls (15) are abutted against the bottom wall of the movable groove.

4. A system cabinet for easy access according to claim 1, wherein: be provided with on mounting panel (2) and assist and prop mechanism (4), assist and prop mechanism (4) including assisting vaulting pole (41), fixed disk (42) and support tight subassembly (43), assist vaulting pole (41) vertical sliding fit and be in on mounting panel (2), fixed disk (42) are connected assist the bottom of vaulting pole (41), support tight subassembly (43) and set up on mounting panel (2), support tight subassembly (43) and be used for locking assist vaulting pole (41).

5. The easy access system cabinet of claim 4, wherein: the tight subassembly (43) is supported includes pressing plate (431), supports tight board (432), supports tight spring (433) and connecting rod (434), it has pressing groove (24) and extrusion groove (25) to open on mounting panel (2), pressing groove (24) with extrusion groove (25) set up relatively, pressing plate (431) sliding fit is in pressing groove (24), support tight board (432) sliding fit in extrusion groove (25), support tight board (432) laminating auxiliary stay (41), connecting rod (434) pressing plate (431) with support tight board (432) between connect a plurality of, connecting rod (434) with mounting panel (2) sliding fit, support tight spring (433) cover and establish on connecting rod (434), and be located pressing plate (431) with press between the diapire of groove (24), support tight auxiliary stay (41) when, support tight board (432) support tight stay (41) and support tight state, support tight spring (433) and be the tight state of supporting.

6. A system cabinet for easy access as defined in claim 5, wherein: the supporting plate (432) is connected with supporting teeth (4321), the side wall, close to the supporting plate (432), of the auxiliary stay bar (41) is connected with fixing teeth (411), and the supporting teeth (4321) are meshed with the fixing teeth (411).

7. A system cabinet for easy access according to claim 1, wherein: the mounting plate (2) corresponds open on the side of side door (12) has standing groove (26), be provided with flexible handle (27) in standing groove (26), flexible handle (27) are including movable rod (271) and telescopic link (272), telescopic link (272) are in two is connected to the level in standing groove (26), movable rod (271) are connected two between telescopic link (272), when flexible handle (27) shrink, flexible handle (27) are located in standing groove (26).

8. A system cabinet for easy access according to claim 1, wherein: the locking piece (13) is a bolt.