CN111972826A

CN111972826A - Lifting mechanism and two-piece type lifting table

Info

Publication number: CN111972826A
Application number: CN202011044317.7A
Authority: CN
Inventors: 王福东
Original assignee: Guangdong Shunde Lingqing Xiang Health Polytron Technologies Inc
Current assignee: Guangdong Shunde Lingqing Xiang Health Polytron Technologies Inc
Priority date: 2020-09-28
Filing date: 2020-09-28
Publication date: 2020-11-24

Abstract

The invention provides a lifting mechanism.A supporting outer pipe is sleeved on a supporting inner pipe; the handle is connected with the pull rod and arranged above the supporting outer tube; the pull nail is connected with the support inner tube, a pull groove which is vertically arranged is arranged on the pull rod, and the pull nail is vertically connected with the pull groove in a sliding manner; the lower end of the pull rod is connected with the U-shaped piece, the U-shaped piece is provided with an inclined chute with the left end inclined upwards, the pull rod base is provided with a transverse chute which is transversely arranged, one end of the connecting nail is connected with the inclined chute in a sliding manner, and the other end of the connecting nail penetrates through the transverse chute and then is connected with the bolt and is connected with the connecting nail and the transverse chute in a sliding manner; the positioning strip is connected with the supporting outer pipe and is provided with vertically arranged pin holes; the bolt is connected with the pull rod base in a sliding mode and is inserted into the pin hole; the lower part of the volute spiral spring is connected with the pull rod base, and the upper end of the volute spiral spring is connected with the upper part of the supporting outer pipe. The invention also provides a two-piece type lifting table. The invention is convenient to adjust and lift.

Description

Lifting mechanism and two-piece type lifting table

Technical Field

The invention belongs to the field of lifting tables, and particularly relates to a lifting mechanism and a two-piece type lifting table.

Background

The chinese patent publication No. CN205515304U discloses a portable dining table for a hospital bed, wherein a first positioning hole is formed at a lower end of a first rod, a second positioning hole is formed at an upper end of a second rod, a positioning pin is inserted into the second positioning hole, when the first rod is inserted into the second rod from the upper end of the second rod, the first positioning hole and the second positioning hole are overlapped, and the positioning pin simultaneously penetrates through the first positioning hole and the second positioning hole, so that the first rod and the second rod are fixedly connected; the first section rod and the second section rod are equivalent to a support inner tube and a support outer tube.

When the height of the lifting table in the prior art is adjusted, the table top needs to be supported by bending down, and the positioning pins are manually taken out from the first positioning holes and the second positioning holes, so that the height of the table can be adjusted; the desktop is required to be moved and supported, so that the first positioning hole and the second positioning hole are overlapped, and the positioning pin can be inserted into the first positioning hole and the second positioning hole to fix the height of the desktop. The problem that prior art exists is that the regulation of lift table is more troublesome.

Therefore, the prior art is in need of improvement.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the lifting mechanism is provided, and the lifting is convenient to adjust; provides a two-piece type lifting table which is convenient to adjust and lift.

In order to achieve the purpose, the specific technical scheme of the invention is as follows:

a lifting mechanism comprises an outer supporting pipe, an inner supporting pipe, a handle, a pull rod, a U-shaped sheet, a pull rod base, a connecting nail, a plug pin and a positioning strip; the supporting outer pipe is sleeved on the supporting inner pipe; the positioning strip is arranged between the support outer pipe and the support inner pipe and is connected with the support outer pipe, more than two pin holes are formed in the positioning strip, and the pin holes are vertically arranged; the pull rod and the U-shaped sheet are both arranged in the support inner tube, and the pull rod base is connected with the bottom of the support inner tube; the handle is connected with the pull rod and arranged above the supporting outer tube; the bolt is connected with the pull rod base in a transverse sliding mode, the supporting inner tube is provided with a hole for the bolt to pass through, and one end of the bolt passes through the supporting inner tube and then is inserted into the pin hole; the lower end of the pull rod is connected with the U-shaped piece, an inclined sliding groove with the left end inclined upwards is formed in the U-shaped piece, and a transverse sliding groove is formed in the pull rod base in a transverse mode; one end of the connecting nail is connected with the bolt, the other end of the connecting nail penetrates through the inclined sliding groove and the transverse sliding groove, and the connecting nail is connected with the inclined sliding groove and the transverse sliding groove in a sliding mode.

As a further improved technical scheme, the pull rod support further comprises a spiral spring, wherein a hollow groove is formed in the bottom of the pull rod base, the lower portion of the spiral spring is arranged in the hollow groove and connected with the pull rod base, the upper end of the spiral spring is connected with the upper portion of the support outer pipe, and the upper portion of the spiral spring is arranged between the support outer pipe and the support inner pipe.

As an optional technical scheme, the pull rod type bolt further comprises an ejection spring, and the ejection spring is connected with the right end of the bolt and the pull rod base; the pull rod base is provided with a vertical sliding groove which is vertically arranged, and the connecting vertical sliding groove is connected with the U-shaped sheet in a sliding manner.

As an optional technical scheme, the device also comprises a blind rivet, a pull rod spring and a limiting block; an avoidance through groove is formed in the support inner pipe, and the handle is arranged in the avoidance through groove; the rivet is connected with the supporting inner tube, a vertically arranged pull groove is formed in the pull rod, the rivet is connected with the pull groove in a sliding mode, the limiting block is connected with the pull rod, the limiting block is arranged below the rivet, the pull rod spring is sleeved on the pull rod, and the upper end and the lower end of the pull rod spring are connected with the rivet and the limiting block respectively.

As optional technical scheme, still include cushion and outer tube cap, the cushion is all located support between outer tube and the support inner tube, the cushion is located the inboard of locating bar, the cushion with the locating bar is connected, the outer tube cap is located support the top of outer tube and with the cushion is connected.

As an optional technical scheme, the spiral spring support device further comprises a clamping groove, the clamping groove is formed between the support outer pipe and the support inner pipe and is connected with the support inner pipe, and the upper end of the spiral spring penetrates through the clamping groove.

The invention also provides a two-piece type lifting table, which comprises the lifting mechanism, and further comprises an H-shaped bottom pipe, a first table plate, a second table plate, a connecting pipe and a fixing plate, wherein the connecting pipe is connected with the upper part of the supporting inner pipe, the H-shaped bottom pipe is connected with the bottom of the supporting outer pipe, the first table plate is connected with the connecting pipe through the fixing plate, and the second table plate is rotatably connected with the first table plate.

As a further improved technical scheme, the improved table further comprises a first adjusting plate, a second adjusting plate, a first supporting rod and a second supporting rod, wherein the first supporting rod and the second supporting rod are respectively connected with the first table plate and the second table plate, the first adjusting plate and the second adjusting plate are respectively connected with the first supporting rod and the second supporting rod, a fixing plate is connected with the first supporting rod, the second supporting rod is sleeved on the first supporting rod, more than two adjusting holes distributed in an annular array manner are formed in the first adjusting plate, an adjusting protrusion is formed in the second adjusting plate, and the adjusting protrusion is clamped in the adjusting holes; the front part and the rear part of the second table plate are both provided with upwards-raised stop bars.

As a further improved technical scheme, the device further comprises an adjusting screw rod, a knob and an adjusting spring, wherein the adjusting screw rod is connected with the connecting plate in a sliding mode, the knob is connected with the adjusting screw rod in a threaded mode, the adjusting spring is sleeved on the adjusting screw rod, and two ends of the adjusting spring are connected with the knob and the adjusting screw rod respectively.

The invention has the beneficial effects that: the supporting outer pipe is used for installing the supporting inner pipe, the handle is used for holding by hand, and the handle can drive the pull rod to move up and down when moving; when the pull rod moves upwards relative to the supporting inner tube, the pull rod drives the U-shaped piece to move upwards, an inclined chute formed by the inclination of the U-shaped piece drives the connecting nail to slide, the connecting nail is driven to move transversely by the inclined chute, the connecting nail drives the bolt to move rightwards, the bolt is disconnected with a pin hole in the positioning strip, the supporting inner tube can move relative to the supporting outer tube at the moment, the supporting inner tube is held to be static after being manually moved, the handle is manually pushed down to reset, the pull rod drives the U-shaped piece to move downwards to enable the bolt to move leftwards, the bolt is connected with the pin hole in the positioning strip, and the supporting inner tube cannot move relative to the supporting outer tube at. The height-adjustable lifting table has the advantages that the connection or disconnection of the bolt and the pin hole can be controlled only by controlling the handle, the supporting inner pipe can be manually moved up and down after the bolt is disconnected with the pin hole, so that the height of the lifting table is changed, the bolt does not need to be drawn out or installed by bending down, the height of the lifting table can be adjusted in a standing posture, and the adjustment is convenient.

Drawings

FIG. 1 is a perspective view of a two-piece lift table of the present invention;

FIG. 2 is a cross-sectional view of the two-piece lift table of the present invention;

FIG. 3 is an enlarged view of portion A of FIG. 2;

FIG. 4 is an enlarged view of portion B of FIG. 2;

fig. 5 is an enlarged view of a portion C of fig. 2.

FIG. 6 is an exploded view of the lift mechanism of the present invention;

in the figure: the lifting device comprises a lifting mechanism 1, a supporting outer pipe 101, a supporting inner pipe 102, an avoiding through groove 1021, a handle 103, a pull rod 104, a pull groove 1041, a pull nail 105, a U-shaped sheet 106, an inclined sliding groove 1061, a pull rod base 107, a transverse sliding groove 1071, an empty groove 1072, a vertical sliding groove 1073, a connecting nail 108, a bolt 109, a positioning strip 110, a volute spring 111, an ejecting spring 112, a pull rod spring 113, a limiting block 114, a rubber cushion 115, an outer pipe cover 116 and a clamping groove 117;

the novel adjustable support comprises an H-shaped bottom pipe 2, a first table plate 3, a second table plate 4, a connecting pipe 5, a fixing plate 6, a first adjusting plate 7, an adjusting hole 71, a second adjusting plate 8, an adjusting protrusion 81, a first support rod 9, a second support rod 10, an adjusting screw rod 11, a knob 12 and an adjusting spring 13.

Detailed Description

The invention is described in detail below with reference to specific embodiments.

Fig. 6 shows an embodiment of the lifting mechanism of the present invention, specifically:

a lifting mechanism 1 comprises an outer supporting pipe 101, an inner supporting pipe 102, a handle 103, a pull rod 104, a U-shaped sheet 106, a pull rod base 107, a connecting nail 108, a plug pin 109 and a positioning strip 110; the supporting outer pipe 101 is sleeved on the supporting inner pipe 102; the positioning strip 110 is arranged between the supporting outer pipe 101 and the supporting inner pipe 102, the positioning strip 110 is connected with the supporting outer pipe 101, more than two pin holes are formed in the positioning strip 110, and the pin holes are vertically arranged; the pull rod 104 and the U-shaped sheet 106 are arranged in the support inner tube 102, and the pull rod base 107 is connected with the bottom of the support inner tube 102; the handle 103 is connected with the pull rod 104, and the handle 103 is arranged above the supporting outer tube 101; the bolt 109 is connected with the pull rod base 107 in a transverse sliding mode, a hole for the bolt 109 to pass through is formed in the support inner tube 102, and one end of the bolt 109 penetrates through the support inner tube 102 and then is inserted into the pin hole; the lower end of the pull rod 104 is connected with the U-shaped piece 106, an inclined chute 1061 with the left end inclined upwards is arranged on the U-shaped piece 106, and a transverse chute 1071 arranged transversely is arranged on the pull rod base 107; one end of the connecting nail 108 is connected with the latch 109, the other end of the connecting nail 108 penetrates through the inclined chute 1061 and the transverse chute 1071, and the connecting nail 108 is in sliding connection with both the inclined chute 1061 and the transverse chute 1071.

The using principle of the invention is that the supporting outer tube 101 is used for installing the supporting inner tube 102, the handle 103 is used for holding by hand, and the handle 103 can drive the pull rod 104 to move up and down when moving; when the pull rod 104 moves upwards relative to the inner supporting tube 102, the pull rod 104 drives the U-shaped piece 106 to move upwards, the inclined chute 1061 obliquely arranged on the U-shaped piece 106 drives the connecting nail 108 to slide, the connecting nail 108 is driven by the inclined chute 1061 to move transversely, the connecting nail 108 drives the bolt 109 to move right, the bolt 109 is disconnected with the pin hole on the positioning bar 110, the inner supporting tube 102 can move relative to the outer supporting tube 101 at the moment, after the inner supporting tube 102 is moved manually, the inner supporting tube 102 is held to be static, the handle 103 is pushed down to reset manually, the pull rod 104 drives the U-shaped piece 106 to move downwards to enable the bolt 109 to move left, the bolt 109 is connected with the pin hole on the positioning bar 110, and at the moment, the inner supporting tube 102 cannot move relative to the outer. The lifting table has the advantages that the bolt 109 can be controlled to be connected with or disconnected from the pin hole only by controlling the handle 103, the supporting inner pipe 102 can be manually moved up and down after the bolt 109 is disconnected from the pin hole, so that the height of the lifting table is changed, the bolt 109 does not need to be drawn out or installed by bending down, the height of the lifting table can be adjusted in a standing posture, and the adjustment is convenient.

In a preferred embodiment, the tension rod support further comprises a spiral spring 111, a hollow groove 1072 is formed in the bottom of the tension rod base 107, the lower portion of the spiral spring 111 is disposed in the hollow groove 1072 and connected with the tension rod base 107, the upper end of the spiral spring 111 is connected with the upper portion of the support outer pipe 101, and the upper portion of the spiral spring 111 is disposed between the support outer pipe 101 and the support inner pipe 102. After the plug pin 109 is disconnected from the pin hole, the pull rod base 107 can be lifted upwards by utilizing the power of automatic rolling of the volute spiral spring 111, so that the support inner tube 102 can be lifted upwards by the pull rod base 107 without manual lifting, and the lifting mechanism is used for a lifting table and can save labor when the lifting table is lifted.

In a preferred embodiment, the device further comprises an ejection spring 112, the ejection spring 112 is connected to both the right end of the plug pin 109 and the pull rod base 107, a vertical sliding groove 1073 is vertically arranged on the pull rod base 107, and the vertical sliding groove 1073 is slidably connected to the U-shaped plate 106. The ejection spring 112 is used for assisting the plug 109 to move left to be connected with the positioning strip 110, when the height of the lifting table needs to be fixed, the plug 109 needs to move left, the acting force of the ejection spring 112 can push the plug 109 left, the connecting nail 108 slides towards the lower right through the inclined sliding groove 1061, and finally the effects of automatically driving the pull rod 104 to move down and resetting the handle 103 are achieved, and the handle 103 does not need to be manually pressed down for resetting. The vertical connecting chute 1073 can limit the relative sliding track between the U-shaped piece 106 and the pull rod base 107, so that the U-shaped piece 106 can move up and down smoothly, and the process of resetting the handle 103 by the ejection spring 112 is smoother.

In order to enable the grip 103 to be automatically reset, as an optional embodiment, the grip further includes a rivet 105, a pull rod spring 113 and a limiting block 114, the rivet 105 is connected with the support inner tube 102, a vertically arranged pull groove 1041 is arranged on the pull rod 104, and the rivet 105 is vertically slidably connected with the pull groove 1041; the limiting block 114 is connected with the pull rod 104, the limiting block 114 is arranged below the blind rivet 105, the pull rod spring 113 is sleeved on the pull rod 104, and the upper end and the lower end of the pull rod spring 113 are respectively connected with the blind rivet 105 and the limiting block 114. The handle 103 can move up and down in the avoiding through groove 1021, the pull nails 105 and the pull grooves 1041 are used for limiting the relative movement distance between the pull rod 104 and the supporting inner tube 102, when the handle 103 pulls the pull rod 104 to move up, the limiting blocks 114 compress the pull rod spring 113, so that the pull rod 104 and the supporting inner tube 102 have reset kinetic energy, and after the handle 103 is released, the handle 103 can automatically reset relative to the supporting inner tube 102.

In some embodiments, the support device further comprises a rubber pad 115 and an outer tube cover 116, the rubber pad 115 is disposed between the support outer tube 101 and the support inner tube 102, the rubber pad 115 is disposed on the inner side of the positioning strip 110, the rubber pad 115 is connected to the positioning strip 110, and the outer tube cover 116 is disposed on the top of the support outer tube 101 and connected to the rubber pad 115. The rubber pad 115 is used for fixing the distance between the supporting outer tube 101 and the supporting inner tube 102, so that the supporting inner tube 102 is prevented from shaking in the up-and-down moving process, meanwhile, the supporting outer tube 101 and the supporting inner tube 102 are prevented from colliding, and the outer tube cover 116 can play a dustproof and decorative role.

In order to limit the position of the spiral spring 111, in a preferred embodiment, the spiral spring further includes a locking groove 117, the locking groove 117 is disposed between the outer support tube 101 and the inner support tube 102, the locking groove 117 is connected to the inner support tube 102, and the upper end of the spiral spring 111 passes through the locking groove 117. In the process of unwinding and winding the scroll spring 111, the clamping groove 117 can limit the position of the upper part of the spring, so as to avoid the upward deflection of the scroll spring 111.

Referring to fig. 1 to 5, the two-piece lifting table of the present invention is specifically shown in the following embodiments:

the invention also provides a two-piece type lifting table, which comprises the lifting mechanism 1, an H-shaped bottom pipe 2, a first table board 3, a second table board 4, a connecting pipe 5 and a fixing piece 6, wherein the connecting pipe 5 is connected with the upper part of the supporting inner pipe 102, the H-shaped bottom pipe 2 is connected with the bottom part of the supporting outer pipe 101, the first table board 3 is connected with the connecting pipe 5 through the fixing piece 6, and the second table board 4 is rotatably connected with the first table board 3. The H type manages to have higher stability, and elevating system 1 can go up and down first table 3 and second table 4 jointly, and the contained angle between first table 3 and the second table 4 is adjustable makes the use of this two formula lift tables more convenient. The connection between the connection pipe 5 and the upper portion of the support inner pipe 102 may be in the form of a detachable connection, so that the lifting mechanism 1 may be connected to different tables.

As a further preferred embodiment, the table further comprises a first adjusting plate 7, a second adjusting plate 8, a first supporting rod 9 and a second supporting rod 10, wherein the first supporting rod 9 and the second supporting rod 10 are respectively connected with the first table 3 and the second table 4, the first adjusting plate 7 and the second adjusting plate 8 are respectively connected with the first supporting rod 9 and the second supporting rod 10, the fixing plate 6 is connected with the first supporting rod 9, the second supporting rod 10 is sleeved on the first supporting rod 9, the first adjusting plate 7 is provided with more than two adjusting holes 71 distributed in an annular array, the second adjusting plate 8 is provided with adjusting protrusions 81, and the adjusting protrusions 81 are clamped with the adjusting holes 71; the front part and the rear part of the second table plate 4 are both provided with upwards convex stop bars. Through horizontal pulling second bracing piece 10, can stimulate second regulating plate 8, make second regulating plate 8 and first regulating plate 7 be connected or disconnect from each other, second regulating plate 8 and first regulating plate 7 after the disconnection, rotatory second table 4 of accessible drives second bracing piece 10 and second regulating plate 8 rotatory, then translation second table 4 makes second regulating plate 8 and first regulating plate 7 interconnect, in order to adjust protruding 81 and regulation hole 71 to be connected, reach the effect of adjusting the 4 angles of second table. The shelves strip can be used for placing books, facilitates the reading.

In the preferred embodiment, still include adjusting screw 11, knob 12 and adjusting spring 13, adjusting screw 11's one end is passed in proper order second regulating plate 8 with behind the connecting pipe 5 with knob 12 threaded connection, adjusting spring 13 cover is established on adjusting screw 11, adjusting spring 13's both ends respectively with knob 12 with adjusting screw 11 connects. Knob 12 can strain adjusting screw 11 to the left so that adjusting screw 11 can draw second adjusting plate 8 close to first adjusting plate 7, and second adjusting plate 8 is prevented from loosening, and knob 12 can adjust in the reverse direction to loosen second adjusting plate 8.

The features of the embodiments and embodiments described above may be combined with each other without conflict.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A kind of lifting gearing, its characterized in that: comprises an outer supporting pipe, an inner supporting pipe, a handle, a pull rod, a U-shaped sheet, a pull rod base, a connecting nail, a plug pin and a positioning strip;

the supporting outer pipe is sleeved on the supporting inner pipe;

the positioning strip is arranged between the support outer pipe and the support inner pipe and is connected with the support outer pipe, more than two pin holes are formed in the positioning strip, and the pin holes are vertically arranged;

the pull rod and the U-shaped sheet are both arranged in the support inner tube, and the pull rod base is connected with the bottom of the support inner tube;

the handle is connected with the pull rod and arranged above the supporting outer tube;

the bolt is connected with the pull rod base in a transverse sliding mode, the supporting inner tube is provided with a hole for the bolt to pass through, and one end of the bolt passes through the supporting inner tube and then is inserted into the pin hole;

the lower end of the pull rod is connected with the U-shaped piece, an inclined sliding groove with the left end inclined upwards is formed in the U-shaped piece, and a transverse sliding groove is formed in the pull rod base in a transverse mode;

one end of the connecting nail is connected with the bolt, the other end of the connecting nail penetrates through the inclined sliding groove and the transverse sliding groove, and the connecting nail is connected with the inclined sliding groove and the transverse sliding groove in a sliding mode.

2. The lift mechanism of claim 1, wherein: the pull rod is characterized by further comprising a volute spiral spring, the bottom of the pull rod base is provided with a hollow groove, the lower portion of the volute spiral spring is arranged in the hollow groove and connected with the pull rod base, the upper end of the volute spiral spring is connected with the upper portion of the supporting outer pipe, and the upper portion of the volute spiral spring is arranged between the supporting outer pipe and the supporting inner pipe.

3. The lift mechanism of claim 1, wherein: the ejection spring is connected with the right end of the bolt and the pull rod base; the pull rod base is provided with a vertical sliding groove which is vertically arranged, and the connecting vertical sliding groove is connected with the U-shaped sheet in a sliding manner.

4. The lift mechanism of claim 1, wherein: the pull nail, the pull rod spring and the limiting block are also included;

an avoidance through groove is formed in the support inner pipe, and the handle is arranged in the avoidance through groove;

the blind rivet is connected with the supporting inner tube, the pull rod is provided with a pull groove which is vertically arranged, the blind rivet is vertically connected with the pull groove in a sliding way,

the limiting block is connected with the pull rod, the limiting block is arranged below the blind rivet, the pull rod spring is sleeved on the pull rod, and the upper end and the lower end of the pull rod spring are respectively connected with the blind rivet and the limiting block.

5. The lift mechanism of claim 1, wherein: still include cushion and outer tube cap, the cushion is all located support between outer tube and the support inner tube, the cushion is located the inboard of location strip, the cushion with the location strip is connected, the outer tube cap is located support the top of outer tube and with the cushion is connected.

6. The lift mechanism of claim 1, wherein: the spiral spring support is characterized by further comprising a clamping groove, the clamping groove is formed between the support outer pipe and the support inner pipe and is connected with the support inner pipe, and the upper end of the spiral spring penetrates through the clamping groove.

7. A two formula lift tables, its characterized in that: the lifting mechanism comprises the lifting mechanism as claimed in claim 1, and further comprises an H-shaped bottom pipe, a first table plate, a second table plate, a connecting pipe and a fixing plate, wherein the connecting pipe is connected with the upper part of the supporting inner pipe, the H-shaped bottom pipe is connected with the bottom of the supporting outer pipe, the first table plate is connected with the connecting pipe through the fixing plate, and the second table plate is rotatably connected with the first table plate.

8. The two-piece elevating table as set forth in claim 6, wherein: the adjustable table is characterized by further comprising a first adjusting plate, a second adjusting plate, a first supporting rod and a second supporting rod, wherein the first supporting rod and the second supporting rod are respectively connected with the first table plate and the second table plate, the first adjusting plate and the second adjusting plate are respectively connected with the first supporting rod and the second supporting rod, the fixing plate is connected with the first supporting rod, the second supporting rod is sleeved on the first supporting rod, more than two adjusting holes distributed in an annular array mode are formed in the first adjusting plate, adjusting protrusions are arranged on the second adjusting plate, and the adjusting protrusions are clamped in the adjusting holes; the front part and the rear part of the second table plate are both provided with upwards-raised stop bars.

9. The two-piece elevating table as set forth in claim 7, wherein: still include adjusting screw, knob and adjusting spring, adjusting screw with connecting plate sliding connection, the knob with adjusting screw threaded connection, the adjusting spring cover is established adjusting screw is last, adjusting spring's both ends respectively with the knob with adjusting screw connects.