CN218510545U - Head-mounted monitoring equipment fixing device - Google Patents

Abstract

The utility model relates to a wear-type supervisory equipment fixing device, the both sides of supporting the top cap below all are provided with the support bent plate, the other both sides of supporting the top cap below all are provided with the support curb plate, support the first mounting panel of top cap upper portion fixedly connected with, the first curb plate of the equal fixedly connected with in first mounting panel upper portion both sides, first locating pin is worn to be equipped with by first curb plate middle part screw thread, the tip of first locating pin rotates and is connected with first splint, the lateral surface fixedly connected with second mounting panel of support bent plate, the equal fixedly connected with second curb plate in the left and right sides of second mounting panel lateral surface, second locating pin is worn to be equipped with by second curb plate middle part screw thread, the tip of second locating pin rotates and is connected with the second splint, the equal fixedly connected with third curb plate in upper and lower both sides of support curb plate lateral surface, carry on spacingly through the third draw-in groove, through the stability when spacing improves the centre gripping, avoid appearing loose, the phenomenon of rocking, ensure the stable control of supervisory equipment.

Description

Head-mounted monitoring equipment fixing device

Technical Field

The utility model relates to a wearing equipment technical field, concretely relates to wear-type supervisory equipment fixing device.

Background

During the use of the head-mounted electronic device, the head-mounted electronic device is often required to be worn around the head.

The patent document with the publication number of CN216643634U discloses a wear fixing device, through the casing and at inside two pars contractilis, pivot and the carousel of being provided with of casing, the center cover of carousel is established in the pivot, the knob with carousel fixed connection can drive the carousel rotates, the free end of pars contractilis with wear-type electronic equipment connects for realize according to the person's of wearing head type, face type, fat thin difference, come to adjust the elasticity of wearing, have simple reliable easy operation advantage.

The device has the following defects that when the device is used, the fixing structure only comprises three parts, the number is small, monitoring equipment with large weight and large number cannot be supported, the stability is insufficient during installation, and when the device is used, the parts are narrow in size, small in number, large in bearing capacity and strong in pressure, so that a user can easily feel uncomfortable symptoms when using the device, and the wearing comfort is influenced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to the problem that exists with not enough above-mentioned, provide a wear-type supervisory equipment fixing device, promoted holistic work efficiency.

The utility model solves the technical problems that:

(1) When the device is used, the fixing structure only has three parts, the number is small, monitoring equipment with large weight and large number cannot be supported, and the stability is insufficient during installation;

(2) The device has the advantages of narrow part size, small quantity, large bearing capacity and high pressure when in use, and easily causes a user to have a plurality of uncomfortable symptoms when in use, thereby influencing the wearing comfort.

The purpose of the utility model can be realized by the following technical proposal: the utility model provides a wear-type supervisory equipment fixing device, including supporting the top cap, the both sides of supporting the top cap below all are provided with the support bent plate, the other both sides of supporting the top cap below all are provided with the support curb plate, support the first mounting panel of top cap upper portion fixedly connected with, the first curb plate of the equal fixedly connected with in first mounting panel upper portion both sides, first curb plate middle part screw thread is worn to be equipped with first gim peg, the tip of first gim peg rotates and is connected with first splint, the lateral surface fixedly connected with second mounting panel of support bent plate, the equal fixedly connected with second curb plate in the left and right sides of second mounting panel lateral surface, the second gim peg is worn to be equipped with in second curb plate middle part screw thread, the tip of second gim peg rotates and is connected with the second splint, the equal fixedly connected with third curb plate in upper and lower sides of support curb plate lateral surface, the third curb plate middle part screw thread that is located the top is worn to be equipped with the third gim peg, one of them supports the curb plate below and is provided with the connect the buckle, another support below and be provided with the connection sleeve, support between the bent plate with the connecting band through linking to each other support bent plate, support between the connecting band.

Preferably, support the top cap all install the mounting bracket all around, support the top and both sides of bent plate, support the top and both sides of curb plate, telescopic band and connecting band all through with the mounting bracket cup joint with support the top cap with support the bent plate, support the curb plate and support the bent plate and support the curb plate and be connected buckle and connection cutting ferrule.

Preferably, first clamping grooves are formed in the middle of the end faces of the two sides of the first mounting plate, and the two sides of the lower portion of the first clamping plate are fixedly connected with limiting embedded blocks and the limiting embedded blocks are in embedded sliding connection with the first clamping grooves.

Preferably, a second clamping groove is formed in the middle of the end portions of the upper side and the lower side of the second mounting plate, a limiting embedded rod is fixedly connected to the upper end and the lower end of the second clamping plate, the end portion of the limiting embedded rod is connected with the second clamping groove in an embedded sliding mode, and a supporting strip is fixedly connected to the opposite side face of the lower portion of each pair of the second clamping plates.

Preferably, the middle parts of the two sides of the limiting piece are fixedly connected with limiting columns, and the middle parts of the two sides of the limiting frame are provided with waist-shaped through grooves connected with the limiting columns in a sliding mode.

Preferably, the lower part of the supporting top cover is fixedly connected with a first base plate, one side of the supporting bent plate, which is far away from the second mounting plate, is fixedly connected with a second base plate, and the two sides of the connecting clamping sleeve are both provided with mandible grooves.

Preferably, the outer side surface of the supporting side plate is provided with a third clamping groove, the bottom of the third clamping plate is in embedded sliding connection with the third clamping groove, and the opposite side surfaces of the third clamping plate and the lower portion of the third side plate are fixedly connected with a plurality of limiting strips.

Preferably, the one end of telescopic band is walked around the spacing frame of mounting bracket and fixedly connected with, and the middle part at the telescopic band is cup jointed in one side activity of spacing frame, and spacing bolt is worn to be equipped with by the outside middle part screw thread of spacing frame, and the tip of spacing bolt rotates and is connected with spacing piece, the both sides of spacing piece all with the inside wall sliding connection of spacing frame.

The utility model has the advantages that:

(1) The detectors of the monitoring equipment are stably and firmly installed on the head of a user through clamping and installing the monitoring equipment on the supporting top cover, the supporting bent plates and the supporting side plates, interference among the detectors is avoided, meanwhile, the detectors can be used for centralized monitoring and detection of corresponding directions by taking the user as an origin, when the user wears the monitoring equipment, the connecting belt and the connected supporting bent plates are attached to the forehead, the supporting top cover is placed on the top of the head, the other supporting bent plate is attached to the back of the head, the supporting side plates are attached to the temples at two sides, tightness debugging is carried out through the flexibility of the telescopic belts, then the connecting buckles and the connecting clamp sleeves are clamped and abutted to the mandible, the monitoring equipment is quickly and stably worn on the head, and supporting and bearing are carried out through the supporting top cover and the telescopic belts at two sides of the supporting top cover, the detector of the monitoring equipment is stably clamped and fixed by the connecting buckle, the connecting clamping sleeve and the telescopic belt connected with the connecting clamping sleeve through limiting and fixing, and further elastically bound and fixed through the connecting belt, so that the supporting top cover, the supporting bent plate and the supporting side plate are kept fixed after being worn, the movement of the first clamping plate is further limited through the embedded sliding connection of the limiting embedded block and the first clamping groove, the detector of the monitoring equipment is stably clamped and fixed by the first clamping plate, the movement of the second clamping plate is further limited through the embedded sliding connection of the end part of the limiting embedded rod and the second clamping groove, the monitoring equipment is stably supported by the second clamping plate when the monitoring equipment is clamped by the supporting bar, and when the telescopic belt is limited and clamped by the limit piece pushed by the limit bolt, the limit post is in sliding connection with the waist-shaped through groove, avoid spacing piece pine to take off, when third splint and third side plate cooperation carry out the centre gripping to the supervisory equipment detector, carry on spacingly through the third draw-in groove, through the stability of spacing when improving the centre gripping, avoid appearing loose, the phenomenon of rocking, ensure supervisory equipment's stable monitoring.

(2) Walk around the mounting bracket and with the other end of telescopic band and another mounting bracket that corresponds is fixed cup joints through the one end of telescopic band, thereby to support top cap and support the bent plate, support the curb plate and support the bent plate and support the curb plate and be connected with connector buckle and connector buckle, when the working length of each telescopic band is confirmed to needs, rotate spacing bolt, push away spacing piece through spacing bolt top, through spacing piece centre gripping telescopic band, thereby the working length of fixed telescopic band, adapt to different wearers ' head size, first backing plate and second backing plate are the surface fabric and the sponge filler of soft gauze material and make, protect user's head through first backing plate and second backing plate, avoid user's injury, improve the comfort level of wearing simultaneously, adapt to the four seasons change, and adapt to the surface shape of head more, improve the stability after the constraint.

Drawings

In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.

FIG. 1 is a front view of the overall structure of the present invention;

FIG. 2 is a side view of the overall structure of the support cap of the present invention;

FIG. 3 is a schematic view of the whole structure of the supporting bent plate of the present invention;

FIG. 4 is an enlarged view of area A of FIG. 1;

in the figure: 1. a support cap; 2. a first mounting plate; 3. a first side plate; 4. a first positioning pin; 5. a first splint; 6. a mounting frame; 7. supporting the bent plate; 8. a second mounting plate; 9. a second side plate; 10. a second positioning bolt; 11. a second splint; 12. supporting the side plates; 13. a third side plate; 14. a third positioning bolt; 15. a third splint; 16. a first card slot; 17. a limiting insert block; 18. a stretchable band; 19. a limiting frame; 20. connecting a buckle; 21. connecting a clamping sleeve; 22. a mandibular groove; 23. a second card slot; 24. a limiting embedded rod; 25. a third card slot; 26. a limiting strip; 27. a first backing plate; 28. a second backing plate; 29. a supporting strip; 30. a limit bolt; 31. a limiting sheet; 32. a limiting post; 33. and a connecting belt.

Detailed Description

To further illustrate the technical means and effects of the present invention adopted to achieve the objects of the present invention, the following detailed description of the embodiments, structures, features and effects according to the present invention will be made with reference to the accompanying drawings and preferred embodiments.

Please refer to fig. 1-4: the utility model provides a wear-type supervisory equipment fixing device, including supporting top cap 1, the both sides of supporting top cap 1 below all are provided with support bent plate 7, support the other both sides of top cap 1 below all and all be provided with support curb plate 12, support first mounting panel 2 of 1 upper portion fixedly connected with, the equal fixedly connected with first curb plate 3 in first mounting panel 2 upper portion both sides, first locating pin 4 is worn to be equipped with by first curb plate 3 middle part screw thread, the tip of first locating pin 4 rotates and is connected with first splint 5, the lateral surface fixedly connected with second mounting panel 8 of support bent plate 7, the equal fixedly connected with second curb plate 9 in the left and right sides of the lateral surface of second mounting panel 8, second locating pin 10 is worn to be equipped with by second curb plate 9 middle part screw thread, the tip of second locating pin 10 rotates and is connected with second splint 11, the equal fixedly connected with third curb plate 13 in the upper and lower both sides of support curb plate 12 lateral surface, the third curb plate 13 middle part screw thread that is located the top is worn to be equipped with third locating pin 14, the end rotation of third splint 15 is connected with one of support curb plate, one of which is provided with connection buckle 20 through support buckle 21 between one of support curb plate 12 and the corresponding support buckle 7 and the bent plate, it is connected with another support buckle 20 to support between the connecting band 12 and the support buckle 7, one of support buckle 7, it is connected with another side plate 20, one of support buckle 7, it is connected with another side plate 20 to support buckle, it is connected with the telescopic side plate, it is connected with another side plate, it is connected with the telescopic strap 33 to support buckle 12.

In this embodiment, each detector of the monitoring device is stably and firmly mounted on the head of the user by clamping and mounting the monitoring device on the supporting top cover 1, the supporting bent plate 7 and the supporting side plate 12, and the monitoring device is mounted in a front-back, left-right and left-right layout to avoid interference among the detectors, and meanwhile, each detector can perform centralized monitoring and detection on the corresponding direction by taking the user as an origin, when the monitoring device is worn by the user, the connecting band 33 and the connected supporting bent plate 7 are attached to the forehead, the supporting top cover 1 is placed on the top of the head, the other supporting bent plate 7 is attached to the back of the head, the supporting side plate 12 is attached to two side temples, and loose and tight debugging is performed through the flexibility of the flexible band 18, and then the connecting buckle 20 and the connecting clamp sleeve 21 are clamped and abutted against the lower jaw, so as to be worn quickly and stably on the head, the supporting top cover 1 and the flexible bands 18 connected thereto are supported and supported, and supported by the connecting buckle 20, the connecting buckle 21 and the connecting band 33, and the supporting bent plate 7 and the supporting bent plate 12 are further elastically constrained and fixed, and the monitoring device is prevented from shaking.

Mounting frames 6 are respectively mounted on the periphery of the supporting top cover 1, the upper side and two sides of the supporting bent plate 7, the upper side and two sides of the supporting side plate 12, and the telescopic belt 18 and the connecting belt 33 are respectively connected with the supporting top cover 1, the supporting bent plate 7, the supporting side plate 12, the supporting bent plate 7 and the supporting side plate 12 through the sleeve connection with the mounting frames 6, and are connected with the connecting buckle 20 and the connecting clamp sleeve 21;

mounting bracket 6 and the spacing frame 19 of fixedly connected with are walked around to the one end of telescopic band 18, the middle part at telescopic band 18 is cup jointed in the activity of one side of spacing frame 19, spacing bolt 30 is worn to be equipped with by the outside middle part screw thread of spacing frame 19, the tip of spacing bolt 30 rotates and is connected with spacing piece 31, the both sides of spacing piece 31 all with the inside wall sliding connection of spacing frame 19, in operation, one end through telescopic band 18 is walked around mounting bracket 6 and is cup jointed the other end of telescopic band 18 with another mounting bracket 6 that corresponds is fixed, thereby will support top cap 1 and support bent plate 7, support curb plate 12 and support bent plate 7 and support curb plate 12 and be connected buckle 20 and connection cutting ferrule 21, when the working length of each telescopic band 18 needs to confirm, rotate spacing bolt 30, push up spacing piece 31 through spacing bolt 30, through spacing piece 31 centre gripping telescopic band 18, thereby the working length of fixed telescopic band 18, adapt to different wearers's head size.

First draw-in groove 16 has all been seted up at the both sides terminal surface middle part of first mounting panel 2, and the lower part both sides of first splint 5 equal fixedly connected with spacing abaculus 17 and 16 gomphosis sliding connection of first draw-in groove through spacing abaculus 17 and 16 gomphosis sliding connection of first draw-in groove, further spacing first splint 5's removal ensures first splint 5 centre gripping supervisory equipment's detector steadily.

Second draw-in groove 23 has all been seted up at the upper and lower both sides tip middle part of second mounting panel 8, the equal fixedly connected with in upper and lower both ends of second splint 11 is spacing to inlay the pole 24, and the tip and the 23 gomphosis sliding connection of second draw-in groove of spacing embedded pole 24, every the equal fixedly connected with support bar 29 of the opposite flank of the lower part of second splint 11, tip and the 23 gomphosis sliding connection of second draw-in groove through spacing embedded pole 24, further spacing second splint 11's removal, make second splint 11 stably hold supervisory equipment when centre gripping supervisory equipment through support bar 29, thereby carry out the centre gripping fixedly to supervisory equipment's detector steadily.

The middle parts of the two sides of the limiting piece 31 are fixedly connected with limiting columns 32, the middle parts of the two sides of the limiting frame 19 are provided with waist-shaped through grooves connected with the limiting columns 32 in a sliding mode, when the limiting piece 31 is pushed by the limiting bolt 30 to limit and clamp the telescopic belt 18, the limiting piece 31 is prevented from loosening through the sliding connection of the limiting columns 32 and the waist-shaped through grooves, and the clamping stability is guaranteed.

Support first backing plate 27 of lower part fixedly connected with of top cap 1, support one side fixedly connected with second backing plate 28 that second mounting panel 8 was kept away from to bent plate 7, jaw groove 22 has all been seted up to the both sides of connecting cutting ferrule 21, first backing plate 27 and second backing plate 28 are the surface fabric and the sponge filler of soft gauze material and make, protect user's head through first backing plate 27 and second backing plate 28, avoid user's injury, improve the comfort level of wearing simultaneously, adapt to the four seasons change, and adapt to the surface shape of head more, improve the stability after the constraint.

Third draw-in groove 25 has been seted up to the lateral surface that supports curb plate 12, the bottom and the third draw-in groove 25 gomphosis sliding connection of third splint 15, the equal fixedly connected with a plurality of spacing 26 of the opposite flank of third splint 15 and the third curb plate 13 of lower part, when third splint 15 carries out the centre gripping with the cooperation of third curb plate 13 to the supervisory equipment detector, carry on spacingly through third draw-in groove 25, stability when improving the centre gripping through spacing 26, thereby ensure the stable centre gripping of supervisory equipment detector.

When the utility model is used, each detector of the monitoring equipment is stably and firmly arranged on the head of a user by clamping and arranging the monitoring equipment on the supporting top cover 1, the supporting bent plate 7 and the supporting side plate 12, the interference among the detectors is avoided by arranging the detectors front and back and left and right, meanwhile, each detector can intensively monitor and detect the corresponding direction by taking the user as the origin, when the user wears the utility model, the connecting belt 33 and the connected supporting bent plate 7 are attached to the forehead, the supporting top cover 1 is placed on the top of the head, the other supporting bent plate 7 is attached to the back of the brain, the supporting side plate 12 is attached to the temple parts at two sides, the tightness is debugged by the flexibility of the telescopic belt 18, and then the connecting buckle 20 and the connecting buckle 21 are clamped and abutted to the mandible, thereby the utility model can be worn on the head rapidly and stably, the support top cover 1 and the telescopic belts 18 on the two sides of the support top cover are used for supporting and bearing, the support top cover 1, the support bent plate 7 and the support side plate 12 are kept fixed after being worn by limiting and fixing the connection buckle 20, the connection clamping sleeve 21 and the telescopic belts 18 connected with the connection buckle and the connection clamping sleeve, and further elastic constraint and fixing are carried out by the connection belt 33, so that the support top cover 1, the support bent plate 7 and the support side plate 12 are kept fixed after being worn, the first clamping groove 16 is embedded and slidably connected with the limit embedded block 17, the movement of the first clamping plate 5 is further limited, the first clamping plate 5 is ensured to stably clamp the detector of the monitoring equipment, the movement of the second clamping plate 11 is further limited by embedding and slidably connecting the end part of the limit embedded rod 24 with the second clamping groove 23, the monitoring equipment is stably supported by the second clamping plate 11 through the support strip 29, the detector of the monitoring equipment is stably clamped and fixed, when the limit strip 18 is limited and clamped by the limit bolt 30, the limit piece 31 is prevented from loosening through the sliding connection of the limit column 32 and the waist-shaped through groove, when the third clamping plate 15 and the third side plate 13 are matched to clamp the monitoring equipment detector, the limit is carried out through the third clamping groove 25, the stability during clamping is improved through the limit strip 26, the phenomena of loosening and shaking are avoided, and the stable monitoring of the monitoring equipment is ensured;

the one end through the telescopic band 18 bypasses the mounting bracket 6 and fixedly cup joints the other end of the telescopic band 18 with another corresponding mounting bracket 6, thereby supporting the top cover 1 and supporting the bent plate 7, supporting the side plate 12 and supporting the bent plate 7 and supporting the side plate 12 to be connected with the connecting buckle 20 and the connecting clamping sleeve 21, when the working length of each telescopic band 18 needs to be determined, the limiting bolt 30 is rotated, the limiting piece 31 is pushed through the limiting bolt 30, the telescopic band 18 is clamped through the limiting piece 31, thereby fixing the working length of the telescopic band 18, the head sizes of different wearers are adapted, the first backing plate 27 and the second backing plate 28 are made of fabrics and sponge fillers made of soft gauze materials, the head of the user is protected through the first backing plate 27 and the second backing plate 28, the user is prevented from being injured, meanwhile, the wearing comfort level is improved, the four-season change is adapted, the surface shape of the head is more adapted, and the stability after constraint is improved.

The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above description, and although the present invention has been disclosed by the preferred embodiment, it is not limited to the present invention, and any person skilled in the art can make modifications or changes equivalent to the equivalent embodiments by utilizing the above disclosed technical contents without departing from the technical scope of the present invention, but all the modifications, changes and changes of the present invention made by the technical matters of the present invention are also within the technical scope of the present invention.

Claims (8)

1. The head-mounted monitoring equipment fixing device is characterized by comprising a supporting top cover (1), supporting bent plates (7) are arranged on two sides below the supporting top cover (1), supporting side plates (12) are arranged on the other two sides below the supporting top cover (1), a first mounting plate (2) is fixedly connected to the upper portion of the supporting top cover (1), a first side plate (3) is fixedly connected to the two sides of the upper portion of the first mounting plate (2), a first positioning bolt (4) penetrates through the middle portion of the first side plate (3) through threads, a first clamping plate (5) is rotatably connected to the end portion of the first positioning bolt (4), a second mounting plate (8) is fixedly connected to the outer side surface of the supporting bent plates (7), second side plates (9) are fixedly connected to the left side and the right side surfaces of the second mounting plate (8), a second positioning bolt (10) penetrates through the middle portion of the second side plate (9) through threads, the end portion of the second positioning bolt (10) is rotatably connected to a second clamping plate (11), third side plates (13) are fixedly connected to the upper side surfaces and lower sides of the supporting bent plates (12), a third side plate (13) penetrates through the middle portion of the third side plate (13) through threads, a positioning bolt (14) is connected to the lower portion of the supporting side plate (12), a clamping sleeve (12) is connected to the lower portion (12), and a clamping plate (12) is connected to the lower portion (12), support between top cap (1) and two support bent plate (7) with, support between curb plate (12) and one of them support bent plate (7) and support between curb plate (12) and the connection buckle (20) that correspond and connect cutting ferrule (21) between all link to each other through telescopic band (18), support between curb plate (12) and another support bent plate (7) and link to each other through connecting band (33).

2. The head-mounted monitoring device fixing device according to claim 1, wherein the supporting top cover (1) is provided with mounting frames (6) at the periphery, above and at both sides of the supporting bent plate (7), above and at both sides of the supporting side plates (12), and the telescopic belt (18) and the connecting belt (33) are connected with the supporting top cover (1) and the supporting bent plate (7), the supporting side plates (12) and the supporting bent plate (7), and the supporting side plates (12) and the connecting buckle (20) and the connecting clamp sleeve (21) through the sleeve connection with the mounting frames (6).

3. The head-mounted monitoring device fixing device according to claim 1, wherein the first clamping groove (16) is formed in the middle of the end surfaces of the two sides of the first mounting plate (2), the limiting insert (17) is fixedly connected to the two sides of the lower portion of the first clamping plate (5), and the limiting insert (17) is in embedded sliding connection with the first clamping groove (16).

4. The head-mounted monitoring device fixing device according to claim 1, wherein a second clamping groove (23) is formed in the middle of the upper end portion and the lower end portion of the second mounting plate (8), a limiting embedded rod (24) is fixedly connected to the upper end portion and the lower end portion of the second clamping plate (11), the end portions of the limiting embedded rods (24) are in embedded sliding connection with the second clamping grooves (23), and a supporting bar (29) is fixedly connected to the opposite side surfaces of the lower portion of each pair of second clamping plates (11).

5. The head-mounted monitoring device fixing device according to claim 2, wherein one end of the telescopic belt (18) bypasses the mounting frame (6) and is fixedly connected with a limiting frame (19), one side of the limiting frame (19) is movably sleeved in the middle of the telescopic belt (18), a limiting bolt (30) penetrates through the middle of the outer side of the limiting frame (19), the end of the limiting bolt (30) is rotatably connected with a limiting piece (31), and two sides of the limiting piece (31) are both connected with the inner side wall of the limiting frame (19) in a sliding manner.

6. The head-mounted monitoring device fixing device according to claim 1, wherein a first cushion plate (27) is fixedly connected to the lower portion of the supporting top cover (1), a second cushion plate (28) is fixedly connected to one side of the supporting bent plate (7) far away from the second mounting plate (8), and jaw grooves (22) are formed in two sides of the connecting clamping sleeve (21).

7. The head-mounted monitoring device fixing device according to claim 1, wherein a third clamping groove (25) is formed in an outer side surface of the supporting side plate (12), the bottom of the third clamping plate (15) is in embedded sliding connection with the third clamping groove (25), and a plurality of limiting strips (26) are fixedly connected to opposite side surfaces of the third clamping plate (15) and a lower third side plate (13).

8. The head-mounted monitoring device fixing device according to claim 5, wherein the limiting posts (32) are fixedly connected to the middle parts of the two sides of the limiting piece (31), and the middle parts of the two sides of the limiting frame (19) are provided with waist-shaped through grooves in sliding connection with the limiting posts (32).

Images