CN106193874A - A kind of durable pneumatically spring - Google Patents
A kind of durable pneumatically spring Download PDFInfo
- Publication number
- CN106193874A CN106193874A CN201610768717.XA CN201610768717A CN106193874A CN 106193874 A CN106193874 A CN 106193874A CN 201610768717 A CN201610768717 A CN 201610768717A CN 106193874 A CN106193874 A CN 106193874A
- Authority
- CN
- China
- Prior art keywords
- stator
- integral type
- rotor
- durable
- cylindrical drum
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
- E05F3/00—Closers or openers with braking devices, e.g. checks; Construction of pneumatic or liquid braking devices
- E05F3/02—Closers or openers with braking devices, e.g. checks; Construction of pneumatic or liquid braking devices with pneumatic piston brakes
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
- E05F3/00—Closers or openers with braking devices, e.g. checks; Construction of pneumatic or liquid braking devices
- E05F3/22—Additional arrangements for closers, e.g. for holding the wing in opened or other position
Landscapes
- Sealing Devices (AREA)
Abstract
The present invention proposes a kind of durable pneumatically spring, housing includes being fixedly installed fixed plate together and cylindrical drum, the bottom of cylindrical drum is provided with integral type sealed bottom lid, armature spindle it is rotatablely equipped with in cylindrical drum, it is provided with integral type top between armature spindle and housing and seals washbowl, armature spindle includes rotor and the rotating shaft being set to one, in cylindrical drum, constraint is provided with stator, cylindrical drum internal sleeve is provided with integral type and supports sealing shroud, integral type is arranged with the piston of hollow in supporting sealing shroud, piston offsets with the bottom surface of stator, integral type supports sealing shroud, piston, airtight gas chamber is formed between housing and integral type sealed bottom lid；Compressed nitrogen it is filled with in gas chamber.The present invention improves the reliability of product, and fault rate is substantially reduced, and simplifies the packaging technology of product, and manufacturing cost is substantially reduced；Effectively accomplished to prevent leakage of oil, sealing property to be greatly improved simultaneously.
Description
Technical field
The present invention relates to door closer technical field, especially relate to a kind of durable pneumatically spring.
Background technology
Pneumatically spring is a kind of door closer material, and rotor and axle in pneumatically spring of the prior art are split type knot
Structure, after acutely closing door or long-time use, the rotor of split-type structural and axle are susceptible to come off, thus break down,
Impact is normal to be used, additionally the manufacturing cost of split-type structural and complex process, and during assembling, also ratio is relatively time-consuming.It addition, existing skill
Pneumatically spring in art, Figure 12 is the structural representation of prior art split type support sealing shroud；Figure 13 is prior art
Split type top sealing gasket bowl structure schematic diagram；The sealing ring of split-type structural be susceptible to after using for a long time dislocation and squeezed
Bad, lose sealing and cause leakage of oil to be intake.
Summary of the invention
The present invention proposes one pneumatically spring, and integral type rotor spindle structure improves the reliability of product, and fault rate is big
Big reduction, simplifies the packaging technology of product, and manufacturing cost is substantially reduced；Leakage of oil, sealing property have effectively been accomplished to prevent simultaneously
It is greatly improved.
The technical scheme is that and be achieved in that: a kind of durable pneumatically spring, including housing, described housing bag
Including the fixed plate and cylindrical drum being fixedly installed together, described fixed plate is provided with stretches out hole, and the bottom of described cylindrical drum is provided with
Integral type sealed bottom lid, is rotatablely equipped with armature spindle, is provided with integral type between described armature spindle and housing in described cylindrical drum
Top seals washbowl, and described armature spindle includes rotor and the rotating shaft being set to one, and one end of described rotating shaft is through described fixing
Plate stretch out hole, constraint is provided with the stator suitable with described armature spindle in described cylindrical drum, and described cylindrical drum is internal sheathed
Having integral type to support sealing shroud, described integral type is arranged with the piston of hollow, described piston and described stator in supporting sealing shroud
Bottom surface offset, described integral type support sealing shroud, piston, form airtight gas between housing and integral type sealed bottom lid
Chamber；It is filled with compressed nitrogen in described gas chamber.
As the preferred technology of one, the lower surface of described rotor is provided with a rotor straight-line groove, described rotor straight-line groove
Being respectively provided on two sides with a symmetrically arranged rotor male and fomale(M&F), each described rotor male and fomale(M&F) all includes a rotor boss, Mei Yisuo
State the symmetrically arranged rotor sector cambered surface that is respectively provided on two sides with of rotor boss, the described rotor sector sub-male and fomale(M&F) of cambered surface rotation
Extend gradually downward to rotor straight-line groove；The upper surface of described stator is provided with a stator straight-line groove, the two of described linear stator groove
Side is respectively equipped with a symmetrically arranged stator male and fomale(M&F), and each described stator male and fomale(M&F) all includes a stator concave station, each described
Stator concave station be respectively provided on two sides with a symmetrically arranged stator sector cambered surface, described stator sector cambered surface makes sub-male and fomale(M&F) by oneself extremely
Linear stator groove extends gradually downward.
As the preferred technology of one, described integral type top seals washbowl and includes outer rubber washbowl and interior metal anti-wear cover
Bowl, described interior metal anti-wear cover bowl is flush-mounted in the inner peripheral surface of described outer rubber washbowl, the top bowl of described interior metal anti-wear cover bowl
Mouth diameter is less than institute more than top the rim of a bowl diameter of described outer rubber washbowl, bottom the rim of a bowl diameter of described interior metal anti-wear cover bowl
State bottom the rim of a bowl diameter of outer rubber washbowl.
As the preferred technology of one, the inwall of described cylindrical drum is vertically provided with some vertical guiding tongues,
The side face of described stator is provided with the detent that quantity is corresponding with described vertical guiding tongue.
As the preferred technology of one, described integral type supports sealing shroud and includes ring-shaped rubber sealing ring, described annular rubber
Being embedded with becket in the upper end of glue sealing ring, described becket leans mutually with some described vertical guiding tongues.
As the preferred technology of one, described piston one end open is arranged, and the other end is closed and arranged, the closing of described piston
End offsets with described bottom surface.
As the preferred technology of one, described integral type sealed bottom lid includes that a rubber closure and a metal are close
Capping, described metallic sealed cover is flush-mounted in described rubber seal and covers, and the diameter of described metallic sealed cover is less than described rubber
Seal lid.
As the preferred technology of one, described fixed plate is evenly equipped with four fixing holes.
It is the integral housing by laser welding as the preferred technology of one, described fixed plate and cylindrical drum.
Have employed technique scheme, the invention have the benefit that owing to pneumatically the armature spindle of spring includes arranging
The rotor being integrated and rotating shaft, the structure of this integral type armature spindle, the rotor and the axle that effectively avoid split-type structural hold
Easily falling off, improve the reliability of product, fault rate is substantially reduced；Integral type top it is provided with close between armature spindle and housing
Packing bowl, the bottom of cylindrical drum is provided with integral type sealed bottom lid, and cylindrical drum internal sleeve is provided with integral type and supports sealing shroud, described
Integral type is arranged with the piston of hollow in supporting sealing shroud, described piston offsets with the bottom surface of described stator, and described integral type is propped up
Support sealing shroud, piston, between housing and sealing lid, form airtight gas chamber, effectively accomplish to prevent leakage of oil, sealing property
It is greatly improved.
Owing to the present invention is during closing the door, rotor sector cambered surface contacts with stator sector cambered surface all the time, it is ensured that door is certainly
Row slowly closing, lowers impulsive force, forms comfortable effect when closing, and rotor boss enters stator after door completely closes
In straight-line groove, stator concave station enters rotor straight-line groove after door completely closes, and closes the most sub-straight-line groove and rotor straight-line groove completely
Formed and intersect, it is to avoid the technical barrier that door still can swing after closedown.
Including outer rubber washbowl and interior metal anti-wear cover bowl owing to integral type top seals washbowl, interior metal anti-wear cover bowl is embedding
Being loaded on the inner peripheral surface of outer rubber washbowl, integral structure effectively prevent and makes outer rubber close because metal abrasionproof teabowl with a cover rotates
Packing bowl squeezes bad phenomenon, thus effectively prevents leakage of oil, gas leakage, and more durable, product quality is greatly promoted；Additionally simplify
The packaging technology of product, manufacturing cost is substantially reduced.
Include ring-shaped rubber sealing ring owing to integral type supports sealing shroud, the upper end of ring-shaped rubber sealing ring is embedded in
Having becket, becket to push up mutually with some vertical guiding tongues, integral structure simplifies the packaging technology of product, good airproof performance
And more durable, manufacturing cost is substantially reduced.
Owing to integral type sealed bottom lid includes a rubber closure and a metallic sealed cover, described metallic sealed cover
Being flush-mounted in described rubber seal to cover, integral structure effectively prevents leakage of oil, gas leakage, and more durable, product quality carries significantly
Rise；Additionally simplifying the packaging technology of product, manufacturing cost is substantially reduced.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, also may be used
To obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the STRUCTURE DECOMPOSITION figure of the present invention；
Fig. 3 is the axonometric chart of the present invention；
Fig. 4 is the structural representation that integral type of the present invention supports sealing shroud；
Fig. 5 is the structural representation of armature spindle of the present invention；
Fig. 6 is the structural representation of stator of the present invention；
Fig. 7 is the structural representation that integral type top of the present invention seals a certain angle of washbowl；
Fig. 8 is the structural representation that integral type top of the present invention seals another angle of washbowl；
Fig. 9 is the sectional view that integral type top of the present invention seals washbowl；
Figure 10 is the sectional view of integral type sealed bottom lid of the present invention；
Figure 11 is the axonometric chart of integral type sealed bottom lid of the present invention；
Figure 12 is the structural representation of prior art split type support sealing shroud；
Figure 13 is the split type top sealing gasket bowl structure schematic diagram of prior art.
Wherein: 1, fixed plate；2, cylindrical drum；3, fixing hole；4, hole is stretched out；5, integral type sealed bottom lid；6, armature spindle；
7, integral type top seals washbowl；8, rotor；9, rotating shaft；10, stator；11, tongue is vertically guided；12, detent；13, one
Body formula supports sealing shroud；14, piston 14, piston；15, gas chamber；16, rotor straight-line groove；17, rotor boss；18, rotor fan
Shape cambered surface；19, linear stator groove；20, stator concave station；21, stator sector cambered surface；22, outer rubber washbowl；23, interior metal abrasionproof
Teabowl with a cover；24, ring-shaped rubber sealing ring；25, becket；26, rubber closure；27, metallic sealed cover.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments wholely.Based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under not making creative work premise
Embodiment, broadly falls into the scope of protection of the invention.
As Figure 1-3, a kind of durable pneumatically spring, including housing, housing includes being fixedly installed consolidating together
Determining plate 1 and cylindrical drum 2, fixed plate 1 is evenly equipped with four fixing holes 3, fixed plate 1 is provided with stretches out hole 4, the bottom of cylindrical drum 2
It is provided with integral type sealed bottom lid 5, is rotatablely equipped with armature spindle 6 in cylindrical drum 2, between armature spindle 6 and housing, is provided with integral type
Top seals washbowl 7, and armature spindle 6 includes rotor 8 and the rotating shaft 9 being set to one, and one end of rotating shaft 9 is stretched through fixed plate 1
Portalling 4, in cylindrical drum 2, constraint is provided with the stator 10 suitable with armature spindle 6, and the inwall of cylindrical drum 2 vertically sets
Having some vertical guiding tongues 11, the side face of stator 10 is provided with quantity and guides, with vertical, the detent 12 that tongue 11 is corresponding.
Cylindrical drum 2 internal sleeve is provided with integral type and supports sealing shroud 13, and integral type is arranged with the piston 14 of hollow in supporting sealing shroud 13, live
Plug 14 offsets with the bottom surface of stator 10, and piston 14 one end open is arranged, and the other end is closed and arranged, the blind end of piston 14 and stator
The bottom surface of 10 offsets.Integral type support sealing shroud 13, piston 14, formed between housing and integral type sealed bottom lid 5 airtight
Gas chamber 15；It is filled with compressed nitrogen in gas chamber 15.
The following is armature spindle 6 and stator 10 more detailed description:
As it is shown in figure 5, the lower surface of rotor 8 is provided with a rotor straight-line groove 16, being respectively provided on two sides with of rotor straight-line groove 16
One symmetrically arranged rotor male and fomale(M&F), each rotor male and fomale(M&F) all includes a rotor boss 17, the both sides of each rotor boss 17
Being respectively equipped with a symmetrically arranged rotor sector cambered surface 18, rotor sector cambered surface 18 is from rotor male and fomale(M&F) 17 to rotor straight-line groove 16
Extend gradually downward；As shown in Figure 6, the upper surface of stator 10 is provided with a stator straight-line groove 19, and the both sides of linear stator groove 19 are divided
Not being provided with a symmetrically arranged stator male and fomale(M&F), each stator male and fomale(M&F) all includes a stator concave station 20, each stator concave station 20
Be respectively provided on two sides with a symmetrically arranged stator sector cambered surface 21, stator sector cambered surface 21 from stator male and fomale(M&F) to linear stator
Groove 19 extends gradually downward.Owing to the present invention is during closing the door, rotor sector cambered surface 18 all the time with stator sector cambered surface 21
Contact, it is ensured that door slowly closing voluntarily, lowers impulsive force, forms comfortable effect when closing, and rotor boss 17 is complete at door
Entering in linear stator groove 19 after contract fully, stator concave station 20 enters rotor straight-line groove 16 after door completely closes, and closes the door completely
Rear sub-straight-line groove and rotor straight-line groove 16 form and intersect, it is to avoid the technical barrier that door still can swing after closedown.
In the present embodiment, as Figure 7-9, sealing washbowl 7 in integral type top includes that outer rubber washbowl 22 and interior metal are prevented
Mill teabowl with a cover 23, interior metal anti-wear cover bowl 23 is flush-mounted in the inner peripheral surface of outer rubber washbowl 22, the top bowl of interior metal anti-wear cover bowl 23
Mouth diameter is less than outer rubber more than top the rim of a bowl diameter of outer rubber washbowl 22, bottom the rim of a bowl diameter of interior metal anti-wear cover bowl 23
Bottom the rim of a bowl diameter of washbowl 22.Integral structure effectively prevent and makes outer rubber seal because metal abrasionproof teabowl with a cover rotates
Washbowl squeezes bad phenomenon, thus effectively prevents leakage of oil, gas leakage, and more durable, product quality is greatly promoted；Additionally simplify product
The packaging technology of product, manufacturing cost is substantially reduced.
As shown in Figure 4, integral type supports sealing shroud 13 and includes ring-shaped rubber sealing ring 24, ring-shaped rubber sealing ring 24 upper
Being embedded with becket 25 on end surface, becket 25 leans with some described vertical guiding tongue 11 phases.Integral structure simplifies
The packaging technology of product, good airproof performance and more durable, manufacturing cost is substantially reduced.
As shown in FIG. 10 and 11, integral type sealed bottom lid 5 includes a rubber closure 26 and a metallic sealed cover
27, metallic sealed cover 27 is flush-mounted on rubber closure 26, and the diameter of metallic sealed cover 27 is less than described rubber closure 26.
Effectively preventing leakage of oil, gas leakage, more durable, product quality is greatly promoted；Additionally simplify the packaging technology of product, be manufactured into
Originally it is substantially reduced.
Additionally, fixed plate 1 and cylindrical drum 2 are the integral housing by laser welding, instead of solder joint and weld+beat
The manufacture that glue seals.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention
Within god and principle, any modification, equivalent substitution and improvement etc. made, should be included within the scope of the present invention.
Claims (9)
1. a durable pneumatically spring, including housing, described housing includes being fixedly installed fixed plate together and cylinder
Cylinder, described fixed plate is provided with stretches out hole, it is characterised in that the bottom of described cylindrical drum is provided with integral type sealed bottom lid, institute
Be rotatablely equipped with armature spindle in stating cylindrical drum, be provided with between described armature spindle and housing integral type top seal washbowl, described turn
Sub-axle includes rotor and the rotating shaft being set to one, and hole, described cylinder are stretched out through described fixed plate in one end of described rotating shaft
In cylinder, constraint is provided with the stator suitable with described armature spindle, and described cylindrical drum internal sleeve is provided with integral type and supports sealing shroud,
Described integral type is arranged with the piston of hollow in supporting sealing shroud, described piston offsets with the bottom surface of described stator, described one
Formula supports sealing shroud, piston, forms airtight gas chamber between housing and integral type sealed bottom lid；In described gas chamber
It is filled with compressed nitrogen.
A kind of durable pneumatically spring the most as claimed in claim 1, it is characterised in that
The lower surface of described rotor is provided with a rotor straight-line groove, described rotor straight-line groove to be respectively provided on two sides with one symmetrically arranged
Rotor male and fomale(M&F), each described rotor male and fomale(M&F) all includes a rotor boss, being respectively provided on two sides with of each described rotor boss
One symmetrically arranged rotor sector cambered surface, the described rotor sector sub-male and fomale(M&F) of cambered surface rotation prolongs gradually downward to rotor straight-line groove
Stretch；
The upper surface of described stator is provided with a stator straight-line groove, described linear stator groove to be respectively provided on two sides with one symmetrically arranged
Stator male and fomale(M&F), each described stator male and fomale(M&F) all includes a stator concave station, being respectively provided on two sides with of each described stator concave station
One symmetrically arranged stator sector cambered surface, described stator sector cambered surface is made sub-male and fomale(M&F) by oneself and is prolonged gradually downward to linear stator groove
Stretch.
A kind of durable pneumatically spring the most as claimed in claim 1, it is characterised in that described integral type top sealing gasket
Bowl includes outer rubber washbowl and interior metal anti-wear cover bowl, and described interior metal anti-wear cover bowl is flush-mounted in the inner circumferential of described outer rubber washbowl
Face, top the rim of a bowl diameter of described interior metal anti-wear cover bowl is more than top the rim of a bowl diameter of described outer rubber washbowl, described Endothelium corneum
Belong to bottom the rim of a bowl diameter bottom the rim of a bowl diameter less than described outer rubber washbowl of abrasionproof teabowl with a cover.
A kind of durable pneumatically spring the most as claimed in claim 1, it is characterised in that edge on the inwall of described cylindrical drum
Vertical direction is provided with some vertical guiding tongues, and it is corresponding with described vertical guiding tongue that the side face of described stator is provided with quantity
Detent.
A kind of durable pneumatically spring the most as claimed in claim 1, it is characterised in that described integral type supports sealing shroud
Including ring-shaped rubber sealing ring, the upper end of described ring-shaped rubber sealing ring is embedded with becket, if described becket with
Dry described vertical guiding tongue leans mutually.
A kind of durable pneumatically spring the most as claimed in claim 1, it is characterised in that described piston one end open sets
Putting, the other end is closed and is arranged, and the blind end of described piston offsets with described bottom surface.
A kind of durable pneumatically spring the most as claimed in claim 1, it is characterised in that described integral type sealed bottom lid
Including a rubber closure and a metallic sealed cover, described metallic sealed cover is flush-mounted in described rubber seal and covers, and institute
State the diameter of metallic sealed cover less than described rubber closure.
A kind of durable pneumatically spring the most according to claim 1, it is characterised in that be evenly equipped with four in described fixed plate
Individual fixing hole.
A kind of durable pneumatically spring the most according to claim 1, it is characterised in that described fixed plate and cylindrical drum are
By the integral housing of laser welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610768717.XA CN106193874A (en) | 2016-08-30 | 2016-08-30 | A kind of durable pneumatically spring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610768717.XA CN106193874A (en) | 2016-08-30 | 2016-08-30 | A kind of durable pneumatically spring |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106193874A true CN106193874A (en) | 2016-12-07 |
Family
ID=58089618
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610768717.XA Pending CN106193874A (en) | 2016-08-30 | 2016-08-30 | A kind of durable pneumatically spring |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106193874A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112081483A (en) * | 2020-07-29 | 2020-12-15 | 承德特耐力门控科技有限公司 | Pneumatic automatic return device |
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|---|---|---|---|---|
| CN2554426Y (en) * | 2002-06-28 | 2003-06-04 | 重庆川东减震制造有限公司 | Dust-proof sealing washer of shock absorber |
| CN2825880Y (en) * | 2005-11-14 | 2006-10-11 | 伦振荣 | Floor spring cover plate |
| CN203363145U (en) * | 2013-07-22 | 2013-12-25 | 浙江联宜电机股份有限公司 | Oil seal for connecting motor and gearbox |
| CN204060288U (en) * | 2014-09-11 | 2014-12-31 | 李龙 | One is spring pneumatically |
| CN204876972U (en) * | 2015-08-28 | 2015-12-16 | 李龙 | Protruding type rotor and guide holder structure of pneumatically spring |
| CN204876973U (en) * | 2015-08-28 | 2015-12-16 | 李龙 | Pneumatically spring |
| US20160060929A1 (en) * | 2013-04-04 | 2016-03-03 | Francisco Alan Freitas Marinho | Structural arrangement in pneumatic floor spring |
| CN206110948U (en) * | 2016-08-30 | 2017-04-19 | 李龙 | Durable pneumatically spring |
-
2016
- 2016-08-30 CN CN201610768717.XA patent/CN106193874A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2554426Y (en) * | 2002-06-28 | 2003-06-04 | 重庆川东减震制造有限公司 | Dust-proof sealing washer of shock absorber |
| CN2825880Y (en) * | 2005-11-14 | 2006-10-11 | 伦振荣 | Floor spring cover plate |
| US20160060929A1 (en) * | 2013-04-04 | 2016-03-03 | Francisco Alan Freitas Marinho | Structural arrangement in pneumatic floor spring |
| CN203363145U (en) * | 2013-07-22 | 2013-12-25 | 浙江联宜电机股份有限公司 | Oil seal for connecting motor and gearbox |
| CN204060288U (en) * | 2014-09-11 | 2014-12-31 | 李龙 | One is spring pneumatically |
| CN204876972U (en) * | 2015-08-28 | 2015-12-16 | 李龙 | Protruding type rotor and guide holder structure of pneumatically spring |
| CN204876973U (en) * | 2015-08-28 | 2015-12-16 | 李龙 | Pneumatically spring |
| CN206110948U (en) * | 2016-08-30 | 2017-04-19 | 李龙 | Durable pneumatically spring |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112081483A (en) * | 2020-07-29 | 2020-12-15 | 承德特耐力门控科技有限公司 | Pneumatic automatic return device |
| CN113047719A (en) * | 2020-07-29 | 2021-06-29 | 承德特耐力门控科技有限公司 | Pneumatic automatic return device |
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| PB01 | Publication | ||
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Application publication date: 20161207 |