CN101104106A

CN101104106A - Dry skating boot front and rear wheel with single direction strong brake

Info

Publication number: CN101104106A
Application number: CNA2007100496914A
Authority: CN
Inventors: 孙群
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-08-07
Filing date: 2007-08-07
Publication date: 2008-01-16

Abstract

The invention discloses a pair of roller skates that utilize the deflexion of the wheel stent to force the front and rear wheel to brake strongly unidirectionally, the main structure of the invention is characterized in that the wheel stent is divided into a front and a rear wheel stent, the two wheel stents are connected actively to the corresponding middle columns on the shell of sole through respective connection pieces, the shell on the front and back sole and/or the middle columns are respectively fixed with two groups of the front and the back braking stents, the two groups of braking stents are respectively connected with a unidirectional brake block, the braking surface of the two unidirectional brake blocks is an arc wheel-touching surface with a basic smooth surface that can respectively engage with the surface of the wheel at the front upper part of the front wheel or the surface of the wheel at the back upper part of the rear wheel, the two unidirectional brake blocks can rotate following the wheel to do a deviated brake after touching the wheel. The invention has a simple and reasonable structure, the braking of the front and rear wheel has the unidirectivity, and the braking operation is reliable with huge braking force, which has function of anti-falling forward and backward, the safety and stability of the invention are good, so the invention is particularly suitable for beginners to use.

Description

Front and back wheel has the roller skate of single direction strong brake

Affiliated technical field

The present invention relates to a kind ofly utilize shoe wheel support deflection and realize the roller skate of single direction strong brake.

Background technology

Present commercially available roller skate, its shoe wheel support and shoe sole shell be for directly fixedlying connected, and general strap brake mechanism not, is at most at the rear side of back footwear wheel a fixing brake shoes to be installed, and be stable and security is relatively poor, and the utmost point is unfavorable for that the beginner uses.The present patent application people has applied for a kind of " utilizing the roller skate of shoe wheel support oscillation brake " (application number is 200510022023.3) in 2005, this technology is divided into front and back wheel brackets with shoe wheel support, and on two shoe wheel supports, be provided with the braking mechanism that brakes with shoe wheel support deflection, brake shoes and formations such as connecting rod top member and brake connecting rod return spring that this braking mechanism is movably connected in brake connecting rod on the shoe wheel support, is in transmission connection with brake connecting rod, though this braking mechanism has certain braking effect, but 1. structure is comparatively complicated, is difficult for realizing; 2. brake weight deficiency; 3. do not have the unidirectional brake function, influence the security of whole roller skate.

Summary of the invention

Utilize the deficiency of the roller skate of shoe wheel support deflection brake at applicant's first generation, the purpose of this invention is to provide the big and front and rear wheel of a kind of brake weight and have the roller skate of different folk prescriptions to braking effect.

Purpose of the present invention mainly realizes the improvement of applicant's above-mentioned first generation technology.Specifically, technical scheme of the present invention is, the present invention has footwear body (1), shoe sole shell (2), front and back wheel brackets (3a, 3b) and is installed on footwear wheel on the shoe wheel support, it is characterized in that the connector (7) of forward and backward support (3a, 3b) by separately is movably connected on the corresponding forward and backward center pillar (11) on the shoe sole shell, forward and backward two shoe wheel supports can rotate around its connector shaft center, promptly have a mind to lift roller skate and make foremost or rearmost footwear wheel can make preceding shoe wheel support or back shoe wheel support deflection with firmly pedaling separately; Forward and backward two shoe wheel supports cooperate together by the assembly that is connected, and have both limited the left and right swing of front and back wheel brackets, make two shoe wheel supports keep roughly the same direction again, increase and slide steady sense; Forward and backward shoe sole shell and/or center pillar be positioned at forward and backward footwear wheel above on be fixedly connected with forward and backward two groups of brake supports (21) respectively, respectively be connected with unidirectional brake block (22) on forward and backward two groups of brake supports, the brake lining of this brake block is the arc wheel trolley face that surface is essentially smooth and can be respectively agree with mutually with back the first half wheel surface of preceding the first half wheel surface of preceding footwear wheel or back footwear wheel, can rotate with the footwear wheel behind two unidirectional brake block wheel trolleys be offset and brake footwear and take turns.When current shoe wheel support upward deflects because of preceding shoe wheel support front end takes place preceding footwear wheel with firmly pedaling, the brake lining of brake block just contacts with the first half wheel surface before the preceding footwear wheel, this moment, brake block there is no braking action if the footwear wheel continues to rotate (being that front-wheel rotates counterclockwise) forward; And if the footwear wheel rotates (being that front-wheel clockwise rotates) backward, then the lower end of brake block can be rotated backward and be offset backward (because brake block is longer with the footwear wheel, certain elasticity is arranged, so can be offset), along with brake block is offset backward, the just powerful gradually extruding front-wheel of the brake lining of brake block, thus the top falls into soft wheel surface and unidirectional brake; In like manner, the brake block above the back footwear wheel also can be implemented reverse strong brake to soft back footwear wheel surface because of the skew behind the wheel trolley.

Above-mentioned unidirectional brake block (22) is movably connected on the brake support (21) by connecting axle, is provided with extension spring (23) between brake block and the brake support, and the brake support is provided with brake block block (41).

Above-mentioned discrete preceding shoe wheel support (3a) stretches in the back shoe wheel support (3b), left and right two parallel contacts of two shoe wheel supports; The assembly that is connected between forward and backward two shoe wheel supports by the connection fixture block (12) between left and right two inwalls of shoe wheel support before being fixedly connected on, be through at and connect on left and right two of fixture block and the preceding shoe wheel support interior connecting rod (15) and the rod sleeve (16) of set special-shaped guide groove (14) and form, connecting fixture block (12) can make left and right two of shoe wheel support firmly link together, rod sleeve (16) terminates in left and right two inwall of back shoe wheel support, and connecting rod is fixedly connected on left and right two of back shoe wheel support by the attaching nut and goes up (referring to Fig. 1-2).This sleeve adds the connected mode of connecting rod, can guarantee forward and backward two shoe wheel supports stablize parallel, not left and right swing when roller skate slides; Simultaneously, connecting rod and rod sleeve can be slidingly matched along special-shaped guide groove (14) when the independent deflection of front and back wheel brackets.

Above-mentioned be connected assembly also can by be located at the slide-bar (24) on left and right two of the shoe wheel support in back and be opened in before special-shaped guide groove (25) on left and right two of the shoe wheel support forms, slide-bar (24) stretches into interior also can slide along guide groove (referring to the Fig. 4) of special-shaped guide groove.This structure makes front and back wheel brackets keep basically identical to slide equally, and under the situation that the footwear wheel all lands, static action power also can be passed to used footwear wheel simultaneously, makes the footwear wheel state that contacts to earth in the process of sliding good, improves stability; When foremost or rearmost footwear wheel firmly landed separately, owing to adopt special-shaped guide barrel construction, forward and backward two shoe wheel supports also can keep independently deflection to rotate.

The above-mentioned assembly that is connected can also adopt by the connection fixture block (12) that is located at the concave, convex portion that can dock each other (26,27) on the front and back wheel brackets and be connected between left and right two of the front and back wheel brackets forms (referring to Fig. 5), connect on left and right two inwalls of the fixedly connected shoe wheel support therein of fixture block (12), another shoe wheel support is movably connected in and connects on the fixture block, and the butt joint concave, convex portion (26,27) of front and back wheel brackets can make corresponding clutch action when shoe wheel support deflection.

Above-mentioned connection fixture block (12) is provided with the projection (18) of extension to upper process, in the corresponding recesses (19) that this projection can stretch on the shoe sole shell to be opened and cooperate (referring to Fig. 2) with it.Simultaneously, also can be provided with on the shoe sole shell to lower process and can stretch into projection (20) (referring to Fig. 1) in the shoe wheel support.After this projection cube structure combines with groove or projection cube structure heads in (or filling in) shoe wheel support, can make support firmly stable, the touchdown point that keeps all footwear wheels is on same straight line.

Unidirectional brake block of the present invention can adopt, and two kinds of structures substitute: one, usefulness unilateral bearing (36) substitute brake block, and unilateral bearing is connected on the forward and backward brake support (referring to Fig. 8) by its linking arm (37).When shoe wheel support deflection, the unidirectionally extruded soft wheel of unilateral bearing energy realize unidirectional brake, but this braking strength is not as good as brake block.Two, substitute brake block (referring to Fig. 9) with the brake ratchet (38) that is connected on the brake support, on forward and backward footwear wheel shaft, be connected with this moment can with its ratchet (39) that coincide, this structure can effectively realize the unidirectional braking effect of the different directions of forward and backward footwear wheel equally.

The present invention can install acoustical generator and/or photophore on positions such as shoe sole shell, be provided with can be with shoe wheel support deflection to disconnect synchronously or closed contact switch (35) (referring to Fig. 2) the electronic acoustooptic effect when being increased in brake in its power circuit.In addition, the present invention is provided with horizontal lock in preformed hole (31) and/or non-horizontal lock preformed hole (32) (referring to Fig. 1) on shoe wheel support, after pinning the horizontal lock preformed hole with bolt, shoe wheel support just can not deflection, and roller skate becomes commercially available craspedodrome roller skate at present; When pin non-horizontal lock preformed hole with bolt after, the footwear wheel is not on the straight line, and wherein the two footwear wheel in the middle of protrudes downwards, is convenient to do the style slide action this moment.Have again, the present invention equally also can be provided with elasticity thing (40) (referring to Fig. 1) between forward and backward two shoe wheel supports and shoe sole shell, this elasticity thing has certain buffering or reduces the effect of the deflection amplitude of shoe wheel support when deflection, also has certain cushioning effect simultaneously.

The present invention has following advantage: the forward and backward footwear wheel of (1) roller skate has the effect of unidirectional brake.After the preceding shoe wheel support deflection, the wheel trolley skew of the brake block on the front brake support has the braking effect that stops preceding footwear wheel to clockwise rotate, and does not rotate counterclockwise and do not influence preceding footwear wheel; After the back shoe wheel support deflection, the skew of the wheel trolley of the brake block on the rear brake kickstand then has the braking effect that stops back footwear wheel to rotate counterclockwise, and does not clockwise rotate and do not influence back footwear wheel.This effect helps to improve the security of sliding, and makes roller skate have the good forward and backward effect of falling that prevents again, is particularly suitable for the beginner and learns the usefulness that dry skating is slided.(2) brake block contacts with the footwear wheel surface by means of shoe wheel support deflection, and then relend and help the footwear wheel to rotate the skew that drives brake block self, cause brake block directly from preceding the first half of footwear wheel or the soft surface that back the first half coats, the extruding footwear are taken turns, and be pressed in the corresponding concave surface of footwear wheel surface formation, thereby braking footwear wheel, thereby brake weight is big, and brake is reliable; Can reach quick on-slip as required.(3) braking mechanism is simple, realizes easily.Simultaneously, brake block, brake unilateral bearing and brake part such as brake ratchet etc. are movable to be connected on the brake support, and realizes the upwards upset of brake part with simple extension spring, thereby the releasing braking action is convenient to skilled glider like this and is used the present invention.(4) compact overall structure of the present invention.Be connected with the connection fixture block between left and right two of the shoe wheel support, and adopt connecting rod and rod sleeve connected mode etc., make two shoe wheel support non-migrations, stable and firmly; When two shoe wheel supports are in level (all footwear wheel shapes time) in line, the parts that are connected between two shoe wheel supports are the state of closely cooperating.The projection of groove or projection is set on the nearly middle part of shoe sole shell, when two shoe wheel supports are in level, connecting projection on the fixture block fills in the groove on the shoe sole shell, or the projection on the shoe sole shell is filled in the shoe wheel support, thereby make shoe sole shell directly withstand shoe wheel support or direct jam-pack groove of projection or shoe wheel support internal pore, make two shoe wheel supports more stable and firm.(5) the present invention is provided with level or non-horizontal lock preformed hole, can satisfy different levels glider's needs; In addition, the present invention also can be provided with the electronic acoustooptic generator that triggers with brake, increases sound and light program.The present invention has applied for utility model patent on the same day.

Description of drawings

Further specify structure of the present invention below in conjunction with Figure of description and embodiment.

Fig. 1 is the present invention's one structural representation

Fig. 2 concerns schematic diagram for the groove fit that connects on fixture block and the shoe sole shell

Fig. 3 agrees with schematic diagram for brake block and footwear wheel surface

Fig. 4 is that slide-bar cooperates schematic diagram with special-shaped guide groove

Fig. 5 is the concave, convex portion opposite joining relation schematic diagram of front and back wheel brackets

Fig. 6 is the back-up block structural representation

Fig. 7 is the sound light control circuit schematic diagram

Fig. 8 is a unilateral bearing annexation schematic diagram

Fig. 9 is brake ratchet annexation schematic diagram

The specific embodiment

The present invention sees Fig. 1, have footwear body 1, shoe sole shell 2, mutual discrete front and back wheel brackets 3a, 3b and the two groups of footwear in front and back that are installed in respectively on the front and back wheel brackets and take

turns

4,5 and 5,6, promptly roller skate has four groups of footwear wheels: preceding footwear wheel 4, back footwear are taken turns the middle footwear wheel 5 in 6 and two positions; Front and back wheel brackets 3a, the 3b connector 7 by separately respectively are movably connected on the corresponding center pillar 11 on the shoe sole shell, connector 7 is made up of connecting axle 8, the sleeve 9 and the attaching nut 10 that are placed in outside the connecting axle, sleeve is through in the respective aperture on the center pillar and with its hole wall and contacts, left and right two two ends that are locked in sleeve admittedly of shoe wheel support, forward and backward two shoe wheel support 3a, 3b can rotate around the axle center of its connecting axle; Preceding shoe wheel support 3a stretches within the shoe wheel support 3b of back, left and right two parallel contacts of two shoe wheel supports; Before, be provided with within two shoe wheel supports of back and prevent a shoe wheel support left side, the assembly that is connected of right swing, this coupling assembling is by being fixedly connected on a shoe wheel support left side, connection fixture block 12 on right two inwalls is (among the figure, 13 for connecting the fixing point of fixture block on shoe wheel support), be through at and connect a fixture block and a preceding shoe wheel support left side, connecting rod 15 in the special-shaped guide groove of being offered on right two 14 and rod sleeve 16 are formed, rod sleeve 16 is enclosed within outside the connecting rod 15 and terminates in a shoe wheel support left side, back, right two inwall, connecting rod 15 is fixedly connected on the left side of back shoe wheel support by attaching nut 17, on right two, preceding, during back shoe wheel support deflection, being fixedly coupled bar 15 and rod sleeve 16 can slide along connecting the special-shaped guide groove of being offered on fixture block and the preceding shoe wheel support 14, when two shoe wheel supports are in level, rod sleeve 16 and special-shaped guide groove 14 tight fits; Can establish upwardly extending projection 18 (referring to Fig. 2) on connection fixture block 12, the corresponding grooves 19 that this projection 18 can stretch on the shoe sole shell and be offered is interior and identical with it; In like manner, also can establish on the shoe sole shell to lower process and can stretch into projection 20 (see figure 1)s in the shoe wheel support, both coincide after projection 20 stretches in the shoe wheel support with the shoe wheel support inwall, the dual-side with fixture block 12 coincide again; Be positioned at forward and backward shoe sole shell and/or center pillar and be fixedly connected with forward and backward two groups of brake supports 21 (the brake support also can be the direct extension of shoe sole shell and/or center pillar) on the forward and backward footwear wheel respectively, respectively be connected with unidirectional brake block 22 on forward and backward two groups of brake supports 21, be provided with extension spring 23 between brake block and the brake support, brake support 21 is provided with brake block block 41 to prevent the brake block excessive deflection, and can between block 41 and brake block 22, elastomer 42 be set, to increase the returning place force of brake block when removing braking action; After brake block upwards overturn, extension spring 23 can play fixation.Also can remove extension spring 23 in this enforcement, block 41 and elastomer 42, allow brake block 22 directly be fixed on the brake support 21 (although brake block is fixed on the brake support, because brake block is longer, has certain elasticity, also can produce skew), the brake lining of brake block 22 is arc wheel trolley faces (referring to Fig. 3) that surface is essentially smooth and can be respectively agree with mutually with back the first half wheel surface of preceding the first half wheel surface of preceding footwear wheel 4 or back footwear wheel 6, before front-wheel 4 firmly causes separately with pedaling after the shoe wheel support deflection, brake block 22 contacts with preceding wheel surface, this moment, front-wheel 4 contacted to earth when rotating (clockwise rotating) backward, brake block is promptly driven skew backward, its brake lining can push soft wheel surface, head on or dieback front-wheel and braking, but front-wheel contacts to earth and rotates (rotating counterclockwise) forward, and brake block there is no braking effect; The effect of the brake block on the trailing wheel 6 is then just opposite, be that trailing wheel 6 firmly causes back shoe wheel support deflection separately with pedaling, force back footwear wheel to contact with brake block, skew behind the brake block wheel trolley can produce the effect of roof pressure footwear wheel, therefore back footwear wheel 6 can not continue forward then brake, yet fall back (changeing) there is no much influences backward.

In structure of the present invention, the assembly that is connected between its front and back wheel brackets can adopt following arbitrary forecast scheme configuration: one, in structure shown in Figure 1, replace connection fixture block 12 with fixed bar, the assembly that promptly is connected is made up of the fixed bar on two inwalls of shoe wheel support before being fixedly connected on (or fixedly tabula) and connecting rod and rod sleeve, the special-shaped guide groove slip that connecting rod and rod sleeve can be offered on left and right two of preceding shoe wheel support.Two, preceding shoe wheel support stretches in the shoe wheel support of back, left and right two parallel contacts of two shoe wheel supports, within its shoe wheel support be connected assembly by be located at the slide-bar 24 on left and right two of the shoe wheel support in back and be opened in before special-shaped guide groove 25 on left and right two of the shoe wheel support forms (see figure 4), slide-bar 24 stretches in the special-shaped guide groove and also can slide along it.Three, front and back wheel brackets docks each other, its assembly that is connected constitutes (see figure 5) by the fixture block 12 that is connected within being located at concave, convex portion 26,27 that can correspond to each other on the front and back wheel brackets cooperate and being connected left and right two of front and back wheel brackets, on left and right two inwall of shoe wheel support, back shoe wheel support was movably connected in the special-shaped guide groove that is connected on the fixture block by connecting rod 15 and rod sleeve 16 before connection fixture block 12 was fixedly connected on.Four, the assembly that is connected also can adopt the left and right groove 29 that is arranged on the supermedial back-up block 28 of shoe sole shell and is opened on the back-up block to constitute (see figure 6)s, be provided with elasticity tabula 30 at groove middle part, left and right two of front and back wheel brackets are stretched in the groove 29 and with elasticity tabula 30 and contact.

In addition, in structure of the present invention, (1) can be provided with horizontal lock preformed hole 31 and/or non-horizontal lock preformed hole (claiming style formula locking preformed hole again) 32 (see figure 1)s on front and back wheel brackets; In the structure shown in Fig. 5-6, equally can be provided with on the shoe wheel support level or non-horizontal lock preformed hole (in Fig. 5, its preformed hole be located at the back shoe wheel support be connected on the fixture block with corresponding; In Fig. 6, its preformed hole then is located on front and back wheel brackets and the back-up block correspondingly); (2) between forward and backward two shoe wheel supports and shoe sole shell, can consider to be provided with elasticity thing 40 (referring to Fig. 1),, also have certain cushioning effect simultaneously with the amplitude of buffering shoe wheel support deflection; (3) acoustical generator 33 and photophore 34 (see figure 2)s can be set on the appropriate location of shoe sole shell, its control is provided with in power circuit and can disconnects synchronously or closed contact switch 35 with shoe wheel support deflection, acoustical generator and the photophore (see figure 7) that is connected in parallel.(4) the unidirectional brake block among the present invention also can adopt following two kinds of structures to substitute: one, former and later two unidirectional brake blocks substitute (see figure 8) by forward and backward unilateral bearing 36, and unilateral bearing is connected on the forward and backward brake support 21 by bearing linking arm 37; Bearing linking arm 37 can be fixedly connected on the brake support, also can be movably connected on the brake support by connecting axle, is connected with extension spring between bearing linking arm and the brake support during flexible connection.Two, former and later two unidirectional brake blocks are substituted by the forward and backward brake ratchet 38 that is connected on the brake support, and be connected with ratchet 39 (see figure 9)s on the forward and backward footwear wheel shaft, when shoe wheel support deflection, the brake ratchet can with the identical and unidirectional brake of the ratchet on the ratchet; The brake ratchet fixedly connected or be movably connected in the brake support 21 on; When the brake ratchet is when being movably connected on the brake support 21, to be connected with extension spring 23 between brake ratchet 38 and brake support.

Claims

1. a front and back wheel has the roller skate of single direction strong brake, the footwear that have footwear body (1), shoe sole shell (2), front and back wheel brackets (3a, 3b) and be installed on the shoe wheel support are taken turns, it is characterized in that the connector (7) of front and back wheel brackets (3a, 3b) by separately is movably connected on the corresponding center pillar (11) on the shoe sole shell, forward and backward two shoe wheel supports can rotate around its connector axle center; Forward and backward two shoe wheel supports cooperate together by the assembly that is connected; Be fixedly connected with forward and backward two groups of brake supports (21) respectively on forward and backward shoe sole shell and/or center pillar, respectively be connected with unidirectional brake block (22) on forward and backward two groups of brake supports, two unidirectional brake blocks can contact with the footwear wheel with shoe wheel support deflection; The brake lining of two unidirectional brake blocks is arc wheel trolley faces that surface is essentially smooth and can be respectively agree with mutually with back the first half wheel surface of preceding the first half wheel surface of preceding footwear wheel or back footwear wheel, can rotate with the footwear wheel behind two unidirectional brake block wheel trolleys be offset and brake footwear and take turns.

2. roller skate according to claim 1 is characterized in that unidirectional brake block (22) is movably connected on the brake support (21) by connecting axle, is provided with extension spring (23) between brake block and the brake support, and the brake support is provided with brake block block (41).

3. roller skate according to claim 1 is characterized in that preceding shoe wheel support (3a) stretches within the back shoe wheel support (3b) left and right two parallel contacts of two shoe wheel supports; The assembly that is connected between forward and backward two shoe wheel supports by the connection fixture block (12) between left and right two inwalls of shoe wheel support before being fixedly connected on, be through at and connect on left and right two of fixture block and the preceding shoe wheel support set interior connecting rod (15) and the rod sleeve (16) of special-shaped guide groove (14) and form, rod sleeve (16) terminates in left and right two inwall of back shoe wheel support, connecting rod (15) is fixedly connected on left and right two of the shoe wheel support in back, and connecting rod (15) and rod sleeve (16) can slide along special-shaped guide groove (14).

4. roller skate according to claim 1 is characterized in that preceding shoe wheel support (3a) stretches within the back shoe wheel support (3b) left and right parallel contact of two shoe wheel supports; Between forward and backward two shoe wheel supports be connected assembly by be located at the slide-bar (24) on left and right two of the shoe wheel support in back and be opened in before special-shaped guide groove (25) on left and right two of the shoe wheel support forms, slide-bar (24) stretches into that special-shaped guide groove is interior also can to slide along guide groove.

5. roller skate according to claim 1, it is characterized in that the assembly that is connected between the front and back wheel brackets (3a, 3b) is made up of the connection fixture block (12) that is located at the concave, convex portion (26,27) that can correspond to each other on the front and back wheel brackets cooperate and be connected between left and right two of the front and back wheel brackets, connect fixture block (12) and be fixedly connected on forward and backward two inwall, another shoe wheel support is movably connected in and connects on the fixture block.

6. according to claim 3 or 5 described roller skates, it is characterized in that connection fixture block (12) on the shoe wheel support inwall is provided with the projection (18) to upper process, in the corresponding recesses (19) that this projection can stretch on the shoe sole shell to be opened and cooperate with it.

7. according to claim 1,2,3,4 or 5 described roller skates, it is characterized in that shoe sole shell be provided with to lower process and can stretch into projection (20) in the shoe wheel support.

8. roller skate according to claim 1 is characterized in that former and later two unidirectional brake blocks (22) are substituted by forward and backward unilateral bearing (36), and unilateral bearing is connected on the forward and backward brake support by bearing linking arm (37).

9. roller skate according to claim 1, it is characterized in that former and later two unidirectional brake blocks (22) are substituted by the forward and backward brake ratchet (38) that is connected on the brake support, be connected with ratchet (39) on forward and backward footwear wheel shaft, the brake ratchet can coincide with the ratchet on the ratchet.

10. roller skate according to claim 1 is characterized in that being provided with horizontal lock preformed hole (31) and/or non-horizontal lock preformed hole (32) on shoe wheel support; Acoustical generator (33) and/or photophore (34) are installed on shoe sole shell, are provided with in its power circuit and can disconnect synchronously or closed contact switch (35) with shoe wheel support deflection.