CN107362021B

CN107362021B - Suitable for cervical spondylosis, lumbar vertebra disease, thoracic vertebrae patient bed

Info

Publication number: CN107362021B
Application number: CN201710751360.9A
Authority: CN
Inventors: 袁硕; 其他发明人请求不公开姓名
Original assignee: AFFILIATED HOSPITAL OF JINING MEDICAL UNIVERSITY
Current assignee: The Hospital Attached to Jining Medical College
Priority date: 2016-09-23
Filing date: 2016-09-23
Publication date: 2019-06-11
Anticipated expiration: 2036-09-23
Also published as: CN107343846A; CN107362021A; CN106344324B; CN106344324A; CN107343846B

Abstract

The present invention disclose it is a kind of suitable for cervical spondylosis, lumbar vertebra disease, thoracic vertebrae patient bed, it includes front bedstead, back bedstead and the bed board being disposed there between, and mobile box is equipped with above bed board, is equipped with guide groove in mobile box two sides；Front of the slot is fixed on fore-stock guiding, rear end is fixed on after-poppet, and after-poppet is equipped with re-ciprocating driving motor；Mobile box, which is externally provided with, tramples driving motor, rear side is equipped with hinged seat in mobile box, and hinged seat both ends are hinged with oscillating rod, and mobile box front end bottom surface is equipped with two through-holes in left and right, the elevating lever for being narrower than the through-hole aperture is equipped in the through-hole, elevating lever bottom is equipped with massage foot.It can drive reciprocating movement before and after mobile box by re-ciprocating driving motor with this bed, and in addition under the driving for trampling driving motor, the two massage feet stretched out from mobile box lower end can successively be fallen, just as people is trampling；User can be carried out stepping on back at home, alleviate stiff back, pain and fatigue, promote health.

Description

Suitable for cervical spondylosis, lumbar vertebra disease, thoracic vertebrae patient bed

Technical field

The present invention relates to a kind of furniture, especially a kind of bed.

Background technique

Bed is the indispensable utensil of sleep, and existing bed includes front bedstead, back bedstead and the bed board being disposed there between, Function is more single.

Local blood circulation can be reinforced by stepping on back, alleviate stiff back, pain and fatigue, can be with the adjusting internal organs function of people Can, make us feeling well, it is especially very helpful to cervical spondylosis, lumbar vertebra disease, thoracic vertebrae patient.Everybody goes health preserving room to enjoy now Back service is stepped on, price is higher, it has not been convenient to, particularly with also less suitable for the elderly.

If can lie in can step on back on the bed of family, it will be able to solve the above problems, it is therefore desirable to which inventing one kind can To step on the bed of back.

Summary of the invention

The one kind designed the purpose of the present invention is to solve the deficiency of above-mentioned technology can step on the bed of back.

Bed designed by the present invention, including front bedstead, back bedstead and the bed board being disposed there between, above the bed board Equipped with mobile box, guide groove is equipped in mobile box two sides, and the guide groove is closer to front bedstead, the left and right of the mobile box Two sides is equipped with the axis body for going deep into the guide groove, and the axis body is equipped with the idler wheel that can be rolled in the guide groove；It is described The guiding front of the slot of two sides is fixed on fore-stock, rear end is fixed on after-poppet, and the fore-stock bottom is free end and puts It sets on the front bedstead, handle is equipped on the fore-stock, the after-poppet bottom is hinged on the back bedstead；Before described Bracket is equipped with front-end bearing pedestal, and the after-poppet is equipped with rear bearing block, is equipped with front rotary shaft, institute in the bearing of the front-end bearing pedestal State and be equipped with rear shaft in the bearing of rear bearing block, the front rotary shaft both ends are equipped with driven gear, set in shaft after described there are two Driving gear corresponding with driven gear is additionally provided with driving wheel in rear roller end, and the after-poppet is equipped with reciprocal driving Motor, the re-ciprocating driving motor and the driving wheel are sequentially connected, and are connected with chain between the driving gear and driven gear Item；The guide groove is located on the inside of the chain；Link block, the link block are additionally provided on the left and right two sides of the mobile box It is connected with superposed that section horizontally disposed chain；The mobile box, which is externally provided with, tramples driving motor, the movement Rear side is equipped with hinged seat in cabinet, and the hinged seat both ends are hinged with oscillating rod, and one is additionally provided in the mobile box can The camshaft of rotation, the driving motor of trampling are connect with the camshaft drive, and the camshaft is equipped with two cams in left and right, Two cams, which respectively correspond, to be arranged below two oscillating rods, and the protrusion part of the cam can lift the oscillating rod, institute The protrusion part for stating two cams is spatially in be arranged in a staggered manner, and forms recess after swing rod rear end bending, is swinging The protrusion part that cam is rotated further by the cam after bar is lifted to extreme higher position is fallen into the recess, the mobile box front end Bottom surface is equipped with two through-holes in left and right, is equipped with the elevating lever for being narrower than the through-hole aperture in the through-hole, the elevating lever bottom is equipped with Foot is massaged, the oscillating rod front end is equipped with empty slot, and movable setting is in the empty slot at the top of the elevating lever；The cam is more Close to the rear end of the oscillating rod；Travel switch, the travel switch letter are designed in the rear and front end of a wherein guide groove Number it is input to a controller, which controls the re-ciprocating driving motor work, when arbitrary distance of run switch is touched by idler wheel Controller controls re-ciprocating driving motor reverse operation.

Further embodiment of the present invention is as follows:

The after-poppet bottom, which is hinged on the back bedstead, to be referred to: the set ring set of after-poppet bottom is at the top of back bedstead On circular cross bar, the position on the circular cross bar positioned at lantern ring two sides is equipped with limit convex；

The front bedstead is equipped with strut, and the free end bottom surface of the fore-stock bottom is embedded at the top of the strut；

Movable setting refers in the empty slot at the top of the elevating lever: the oscillating rod front end is equipped with two points of left and right Forks piece, the empty slot are located at bifurcated on piece, are located between the two bifurcated pieces in left and right at the top of the elevating lever, a screw rod also cross The empty slot of two bifurcated on pieces and the top of elevating lever and stop nut is equipped in screw rod end；

The motor shaft of the re-ciprocating driving motor is equipped with belt pulley, which is passed by transmission belt and the driving wheel Dynamic connection；

The phase difference of their protrusion parts of described two cams is 180 degree；

The driving motor of trampling is connect by right-angle steering speed reducer with the camshaft drive；

Elastic rubber ring is equipped on the through-hole, the elastic rubber ring is equipped with the circular cavity for penetrating into bottom surface；

The front bedstead, back bedstead, bed board, fore-stock, after-poppet, guide groove and mobile box material be all wood Head；

Bed designed by the present invention, its beneficial effect is: it can be driven by re-ciprocating driving motor before and after mobile box It moves back and forth, due to being provided with travel switch on guide groove, when arbitrary distance of run switch is touched by idler wheel, controller is controlled past Multiple driving motor reverse operation, i.e. mobile box can go back after reaching the other end；In addition, in the driving for trampling driving motor Under, the two massage feet stretched out from mobile box lower end can successively fall and lift and be in periodically to move, just as people exists It tramples equally, when people lies on bed board, the process stepped on, stepped on from front to back from back to front is may be implemented in two massage feet, with mould Anthropomorphic steps on back movement；Using bed designed by the present invention, can be carried out stepping on back at home, it is at low cost, it is easy to use, especially It is suitble to physical labourer, cervical spondylosis, lumbar vertebra disease, thoracic vertebrae patient and the elderly, can comes designed bed through the invention Reinforce their local blood circulations, alleviate stiff back, pain and fatigue, promotes health.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of embodiment 1；

Fig. 2 is the top view of embodiment 1, does not install chain and transmission belt in figure；

Fig. 3 is the side view of embodiment 1, does not install chain, front rotary shaft, front rotary shaft and transmission belt in figure；

Fig. 4 is the structural schematic diagram of one of embodiment of 1 idler wheel of embodiment；

Fig. 5 is the schematic diagram of embodiment 1 after-poppet and back bedstead；

Fig. 6 is the schematic diagram of embodiment 1 fore-stock and front bedstead；

Fig. 7 is the lateral structural schematic diagram of 1 mobile box of embodiment；

Fig. 8 is structural schematic diagram when 1 mobile box of embodiment is overlooked；

Fig. 9 is the schematic diagram that embodiment 1 swings boom end；

Figure 10 is structural schematic diagram when 2 mobile box of embodiment is overlooked；

Figure 11 is the enlarged drawing of 3 through hole structure of embodiment；

In figure: front bedstead 1, back bedstead 2, bed board 3, mobile box 4, guide groove 5, axis body 6, idler wheel 7, fore-stock 8, rear branch Frame 9, handle 10, front-end bearing pedestal 11, rear bearing block 12, front rotary shaft 13, rear shaft 14, driven gear 15, driving gear 16, transmission Wheel 17, chain 19, link block 20, tramples driving motor 21, hinged seat 22, oscillating rod 23, camshaft at re-ciprocating driving motor 18 24, cam 25, recess 26, through-hole 27, elevating lever 28, massage foot 29, empty slot 30, travel switch 31, controller 32, lantern ring 33, Circular cross bar 34, limit convex 35, strut 36, bifurcated piece 37, screw rod 38, stop nut 39, belt pulley 40, transmission belt 41, right angle Turn to speed reducer 42, elastic rubber ring 43, circular cavity 44, bearing 45, bearing 46.

Specific embodiment

The present invention will be further described below by way of embodiments in conjunction with the accompanying drawings.

Embodiment 1:

As shown in Figure 1, 2, 3, bed described in the present embodiment, including front bedstead 1, back bedstead 2 and be disposed there between Bed board 3, mobile box 4 is equipped with above the bed board 3, is equipped with guide groove 5 in 4 two sides of mobile box, the guide groove 5 closer to Front bedstead 1, the left and right two sides of the mobile box 4 are equipped with the axis body 6 for going deep into the guide groove 5, and the axis body 6 is equipped with can The idler wheel 7 rolled in the guide groove 5；After 5 front end of guide groove of the two sides is fixed on fore-stock 8, rear end is fixed on On bracket 9,8 bottom of fore-stock is free end and is shelved on the front bedstead 1, and handle 10 is equipped on the fore-stock 8, 9 bottom of after-poppet is hinged on the back bedstead 2；The fore-stock 8 is equipped with front-end bearing pedestal 11, on the after-poppet 9 Equipped with rear bearing block 12, it is equipped with front rotary shaft 13 in the bearing 45 of the front-end bearing pedestal 11, in the bearing 45 of the rear bearing block 12 Equipped with rear shaft 14,13 both ends of front rotary shaft are equipped with driven gear 15, set in shaft 14 after described there are two and driven gear 15 corresponding driving gears 16 are additionally provided with driving wheel 17 in rear 14 end of shaft, and the after-poppet 9 is equipped with reciprocal driving electricity Machine 18, the re-ciprocating driving motor 18 is sequentially connected with the driving wheel 17, between the driving gear 16 and driven gear 15 It is connected with chain 19；The guide groove 5 is located at 19 inside of chain；The company of being additionally provided on the left and right two sides of the mobile box 4 Block 20 is connect, the link block 20 is connected with superposed that section horizontally disposed chain 19；As shown in Figure 7,8, the shifting Dynamic cabinet 4, which is externally provided with, tramples driving motor 21, and rear side is equipped with hinged seat 22,22 both ends of hinged seat in the mobile box 4 It is hinged with oscillating rod 23, a rotatable camshaft 24 is additionally provided in the mobile box 4, it is described to trample driving motor 21 It is sequentially connected with the camshaft 24, the camshaft 24 is equipped with two cams 25 in left and right, and two cams 25 respectively correspond setting Below two oscillating rods 23, the protrusion part of the cam 25 can lift the oscillating rod 23, described two cams 25 Protrusion part spatially in being arranged in a staggered manner, forms recess 26 after the bending of 23 rear end of oscillating rod, is lifted in oscillating rod 23 The protrusion part that cam 25 is rotated further by the cam 25 after to extreme higher position is fallen into the recess 26, before the mobile box 4 It holds bottom surface to be equipped with two through-holes 27 in left and right, is equipped with the elevating lever 28 for being narrower than 27 aperture of through-hole, the lifting in the through-hole 27 28 bottom of bar is equipped with massage foot 29, and 23 front end of oscillating rod is equipped with empty slot 30, and the movable setting in 28 top of elevating lever exists In the empty slot 30；The cam 25 is closer to the rear end of the oscillating rod 23；The rear and front end of a wherein guide groove 5 all Equipped with travel switch 31,31 signal of travel switch is input to a controller 32, which controls the reciprocal driving Motor 18 works, and when arbitrary distance of run switch 31 is touched by idler wheel 7, controller 32 controls 18 reverse operation of re-ciprocating driving motor.

Bed described in the present embodiment, its beneficial effect is: it can drive mobile box 4 by re-ciprocating driving motor 18 Front and back moves back and forth, due to being provided with travel switch 31 on guide groove 5, when arbitrary distance of run switch 31 touches time control by idler wheel 7 Device 32 processed controls 18 reverse operation of re-ciprocating driving motor, i.e. mobile box 4 can go back after reaching the other end；In addition, stepping on It steps under the driving of driving motor 21, the two massage feet 29 stretched out from 4 lower end of mobile box can successively fall and lift and be in It periodically moves, just as people is trampling, when people lies on bed board 3, two massage feet 29 be may be implemented from front to back The process step on, stepped on from back to front is acted with simulating the back of stepping on of people；Using bed designed by the present invention, can be carried out at home Back is stepped on, it is at low cost, it is easy to use, it is especially suitable for physical labourer, cervical spondylosis, lumbar vertebra disease, thoracic vertebrae patient and the elderly, it can Reinforce their local blood circulations with bed designed through the invention, alleviates stiff back, pain and fatigue, promote body Health.

Bed described in the present embodiment, re-ciprocating driving motor 18 drive the principle moved back and forth before and after mobile box 4 as follows: Re-ciprocating driving motor 18 and the transmission connection of driving wheel 17 can drive driving wheel 17 to rotate, since driving wheel 17 is located at rear 14 end of shaft Portion can drive the driving gear 16 of left and right two to rotate while shaft 14 rotates after driving, driving gear 16 passes through chain 19 Driven gear 15 is driven to rotate, such chain 19 gets up with regard to movement, and the horizontal segment of chain 19 is positive and negative in re-ciprocating driving motor 18 It can be moved forward and backward when turning, and the link block 20 on mobile box 4 is connected with superposed that section horizontally disposed chain 19 It connects, therefore mobile box 4 can be moved with before and after chain 19, in addition moveable mobile box 4 is a little its left and right two sides axis body 6 On idler wheel 7 can be rolled in guide groove 5, therefore guide groove 5 can to mobile box 4 provide longitudinal bracing power, and When chain 19 tears mobile box 4, mobile box 4 can make front and back again and move, to realize above-mentioned function；

Trampling driving motor 21 drives the principle of two massage feet 29 as follows: trampling driving motor 21 and drives 24 turns of camshaft Dynamic, therefore the cam 25 of left and right two rotates, after cam 25 rotates, the protrusion part of cam 25 can be lifted oscillating rod 23, this The elevating lever 28 that sample is connected to 23 end of oscillating rod is just promoted, and massage foot 29 moves up, when oscillating rod 23 is lifted to highest order It postpones, the protrusion part that cam 25 is rotated further by the cam 25 is fallen into the recess 26, in this way due to 23 lower section wink of oscillating rod Between lose support, oscillating rod 23, elevating lever 28 fall to lowest part under gravity, and massage foot 29 falls to being formed and step on It steps on, and is carried off when cam 25 turns over again, in cycles, since the protrusion part of two cams 25 is spatially in It is arranged in a staggered manner, therefore two massage feet 29 are successively trampled, and the movement of people is simulated；The advantage that be, massage foot 29 be weight Power effect is fallen, and can change the strange power stepped on when changing the weight for massaging foot 29 or installing weight additional on it, another Aspect, massage 29 extreme lower position of foot depend on human body back curve, and recess massage foot 29 just comes to lower, upper convex under back Massage foot 29 just comes to height a bit, will not generate injury to human body；It, will since 23 nose motion track of oscillating rod is in camber line 27 aperture of through-hole is arranged to be coarser than elevating lever 28, and the 28 movable empty slot 30 that 23 front end of oscillating rod is arranged in top of elevating lever It is interior, it may insure that elevating lever 28 normally can be lifted and be fallen in this way.

Since 8 bottom of fore-stock is free end and is shelved on the front bedstead 1, fore-stock 8 is free, after-poppet 9 Bottom is hinged on the back bedstead 2, can be lifted whole device by fore-stock 8 by handle 10 in this way, thus side Person who happens to be on hand for an errand lies to going on bed board 3；

Specifically, as shown in figure 5,9 bottom of the after-poppet is hinged on the back bedstead 2 refers to: 9 bottom of after-poppet 33 sets of lantern ring on the circular cross bar 34 at 2 top of back bedstead, the position on the circular cross bar 34 positioned at 33 two sides of lantern ring is set There is limit convex 35；Certain articulated manner is without being limited thereto, and hinged is also the prior art, specifically unknown to state.

As shown in fig. 6, the front bedstead 1 is equipped with strut 36,8 bottom of fore-stock is embedded at the top of the strut 36 Free end bottom surface；It can ensure that the stability of fore-stock 8 in this way, it will be apparent that as long as fore-stock 8 ensures freely and can obtain external crucible The support of frame 1 is met the requirements；

As shown in figure 9, the movable setting in 28 top of elevating lever refers in the empty slot 30: before the oscillating rod 23 End is equipped with the two bifurcated pieces 37 in left and right, and the empty slot 30 is located on bifurcated piece 37, and left and right two is located at the top of the elevating lever 28 Between bifurcated piece 37, a screw rod 38 also cross empty slot 30 and elevating lever 28 on two bifurcated pieces 37 top and in spiral shell 38 end of bar is equipped with stop nut 39；Obviously, movable setting is without being limited thereto, as empty slot is not only arranged in bifurcated to 23 front end of oscillating rod 30, a rivet that can be moved, rotate and not deviate from empty slot 30 is connected at the top of elevating lever 28；

The motor shaft of the re-ciprocating driving motor 18 be equipped with belt pulley 40, the belt pulley 40 by transmission belt 41 with it is described Driving wheel 17 is sequentially connected；The mode of transmission connection is more, can be realized by gear, chain etc.；

The phase difference of their protrusion parts of described two cams 25 is 180 degree；It is also possible to other angles, such as 120 Degree, lifts as long as forming enough phase differences and can ensure that two massage feet 29 are successively fallen by 150 degree etc.；

The idler wheel 7 is preferably I-beam wheel as shown in Figure 4, and such guide groove 5 is fallen at the recessed limit of idler wheel 7, idler wheel 7 or so Position can be limited, and mobile box 4, which also just obtains limit, keeps 4 position of mobile box more firm, it will be apparent that idler wheel 7 can also be Other structures, as idler wheel 7 be limited in guide groove 5 and rotatable or idler wheel 7 pass through guide groove 5 and on idler wheel 7 it is another Bit architecture of limiting prevents its abjection etc. form.

The technology that controller 32 controls 18 positive and negative rotation of re-ciprocating driving motor by obtaining the information of travel switch 31 is existing Technology, it is specifically unknown to state.

In addition, the front bedstead 1, back bedstead 2, bed board 3, fore-stock 8, after-poppet 9, guide groove 5 and mobile box 4 Metal, such as stainless steel can be selected in material, or makees other selections, the preferably external crucible according to the common sense of those skilled in the art Frame 1, back bedstead 2, bed board 3, fore-stock 8, after-poppet 9, guide groove 5 and mobile box 4 material all use wood, especially can be used Oak, the bed made in this way is more classic, appropriate furniture.

Embodiment 2:

As shown in Figure 10, bed described in the present embodiment, unlike the first embodiment: the driving motor 21 of trampling leads to It crosses right-angle steering speed reducer 42 and the camshaft 24 is sequentially connected.

The speed changing function of right-angle steering speed reducer 42 makes to drive the power of camshaft 24 bigger, and massage 29 weight of foot can be made to do It is bigger, it is more suitable that the turning function of right-angle steering speed reducer 42 makes to trample 21 installation site of driving motor, space-saving.

Embodiment 3:

As shown in figure 11, bed described in the present embodiment, unlike the first embodiment: bullet is equipped on the through-hole 27 Property rubber ring 43, the elastic rubber ring 43, which is equipped with, penetrates into the circular cavity 44 of bottom surface.

Elastic rubber ring 43 is located between elevating lever 28 and through-hole 27 and protects to them, and elastic rubber ring 43 is equipped with The circular cavity 44 for penetrating into bottom surface can improve its buffer capacity as far as possible.

Above-described embodiment is only to give an example to design of the invention, it will be apparent that, the protection scope of this patent is unlimited In above-described embodiment.

Claims

1. it is a kind of suitable for cervical spondylosis, lumbar vertebra disease, thoracic vertebrae patient bed, including front bedstead (1), back bedstead (2) and setting exist Bed board (3) between them is set it is characterized in that being equipped with mobile box (4) above the bed board (3) in mobile box (4) two sides There are guide groove (5), for the guide groove (5) closer to front bedstead (1), the left and right two sides of the mobile box (4), which is equipped with, gos deep into institute The axis body (6) of guide groove (5) is stated, the axis body (6) is equipped with the idler wheel (7) that can be rolled in the guide groove (5)；It is described The front end of the guide groove (5) of mobile box (4) two sides is fixed on fore-stock (8), rear end is fixed on after-poppet (9), Fore-stock (8) bottom is free end and is shelved on the front bedstead (1), is equipped with handle (10) on the fore-stock (8), After-poppet (9) bottom is hinged on the back bedstead (2)；The fore-stock (8) is equipped with front-end bearing pedestal (11), after described Bracket (9) is equipped with rear bearing block (12), is equipped with front rotary shaft (13) in the bearing (45) of the front-end bearing pedestal (11), the rear axle It holds in the bearing (45) of seat (12) and is equipped with rear shaft (14), front rotary shaft (13) both ends are equipped with driven gear (15), after described Driving gear (16) corresponding with driven gear (15) there are two setting in shaft (14), is additionally provided with biography in rear shaft (14) end Driving wheel (17), the after-poppet (9) are equipped with re-ciprocating driving motor (18), the re-ciprocating driving motor (18) and the driving wheel (17) it is sequentially connected, is connected with chain (19) between the driving gear (16) and driven gear (15)；Guide groove (5) position On the inside of the chain (19)；It is additionally provided with link block (20) on the left and right two sides of the mobile box (4), the link block (20) It is connected with superposed horizontally disposed chain (19)；The mobile box (4), which is externally provided with, tramples driving motor (21), institute It states rear side in mobile box (4) and is equipped with hinged seat (22), hinged seat (22) both ends are hinged with oscillating rod (23), in the shifting A rotatable camshaft (24) is additionally provided in dynamic cabinet (4), it is described to trample driving motor (21) and the camshaft (24) biography Dynamic connection, the camshaft (24) are equipped with two cams (25) in left and right, and two cams (25) respectively correspond setting and put at two Below lever (23), the protrusion part of the cam (25) can lift the oscillating rod (23), described two cams (25) Protrusion part be spatially in be arranged in a staggered manner, the oscillating rod (23) rear end bending after formed recess (26), in oscillating rod (23) the protrusion part that cam (25) is rotated further by the cam (25) after being lifted to extreme higher position is fallen into the recess (26), institute It states mobile box (4) front end bottom surface and is equipped with two through-holes (27) in left and right, be equipped in the through-hole (27) and be narrower than through-hole (27) hole The elevating lever (28) of diameter, elevating lever (28) bottom are equipped with massage foot (29), and oscillating rod (23) front end is equipped with empty slot (30), movable setting is interior in the empty slot (30) at the top of the elevating lever (28)；The cam (25) is closer to the swing The rear end of bar (23)；The rear and front end of a guide groove (5) is designed with travel switch (31) wherein, the travel switch (31) Signal is input to a controller (32), which controls re-ciprocating driving motor (18) work, when any one row Controller (32) controls re-ciprocating driving motor (18) reverse operation when Cheng Kaiguan (31) is touched by idler wheel (7)；

After-poppet (9) bottom, which is hinged on the back bedstead (2), to be referred to: the lantern ring (33) of after-poppet (9) bottom is covered rear On circular cross bar (34) at the top of bedstead (2), the position on the circular cross bar (34) positioned at lantern ring (33) two sides is equipped with limit Convex (35)；

Movable setting refers in the empty slot (30) at the top of the elevating lever (28): oscillating rod (23) front end is equipped with a left side Right two bifurcated pieces (37), the empty slot (30) are located on bifurcated piece (37), and left and right two is located at the top of the elevating lever (28) Between bifurcated piece (37), top of the screw rod (38) also cross empty slot (30) and elevating lever (28) on two bifurcated pieces (37) Portion and screw rod (38) end be equipped with stop nut (39).