BACKGROUND OF THE INVENTION
Technical Field
[0001] The invention relates to the field of safety protection, in particular to a safety
helmet with a rotary impact buffering function.
Description of Related Art
[0002] Safety helmets are common safety protection articles; the utility model with the
Chinese patent application No.
CN201520252101.8 discloses a safety helmet which comprises a safety helmet shell, a safety helmet
liner, a fixing endpoint, helmet ribbons, a fixing buckle and a fixing ring, wherein
the safety helmet liner made of an elastic material is fixed in the safety helmet
shell through an outer ring buckle, the fixing endpoint is arranged at the top end,
close to the safety helmet shell, of the safety helmet liner, and the fixing buckle
is arranged at the top end in the safety helmet shell. Traditional safety helmets
are mainly used for protecting the heads of users against normal impact on the safety
helmets from the outside; however, actually, when accidents happen, the probability
that the safety helmets purely bear normal impact force is low, on most occasions,
besides the normal impact force, tangential impact force is also applied to the safety
helmets, the safety helmets are likely to rotate by a certain angle under the effect
of the tangential impact force, and consequentially the heads of users are prone to
being bruised. On this account, a safety helmet with a rotary impact buffering function,
which can well buffer external rotary impact force and protect the heads of users
against bruises when suffering from the rotary impact of external force, is urgently
to be provided. Further prior art can be found in
US 2015/089724 A1,
WO 2015/177747 A1 and
US 2014/096311 A1.
BRIEF SUMMARY OF THE INVENTION
[0003] To overcome the defects that existing safety helmets are poor in capacity to bear
the rotary impact of external force and cannot effectively protect the heads of users
against bruises when suffering from the rotary impact of external force, the invention
provides a safety helmet with a rotary impact buffering function, which can well buffer
external rotary impact force and effectively protect the heads of users against bruises
when suffering from the rotary impact of external force.
[0004] The present invention is defined by the appended independent claim. The dependent
claim is directed to optional features and a preferred embodiment.
[0005] According to the specific technical scheme of the invention, a safety helmet with
a rotary impact buffering function comprises the features of claim 1. In the invention,
the rotary impact buffering device is arranged between the shell and the elastic liner
of the safety helmet and is capable of elastically deforming in the normal direction
of the safety helmet and also capable of elastically deforming in the tangential direction
of the safety helmet. When the safety helmet is impacted by external force, the shell
has the tendency to rotate relative to the elastic liner under the effect of the component
force applied to the shell in the tangential direction; however, in the invention,
the rotary impact buffering device enabling the shell to rotate relative to the elastic
liner is arranged between the shell and the elastic liner, through tangential deformation
of the rotary impact buffering device, the shell can rotate relative to the elastic
liner by a certain angle on the premise of keeping the elastic liner unmoved relatively,
so that a rotary impact buffering function is achieved, and impact to users from external
force is greatly reduced. In addition, the rotary impact buffering device deforms
within a certain range, after the shell of the safety helmet rotates relative to the
elastic liner by a certain angle, the anti-rotation damping force of the rotary impact
buffering device is increased greatly, and thus the rotation angle of the shell relative
to the elastic liner is controlled within a certain range. In this way, the defects
that existing safety helmets are poor in capacity to bear the rotary impact of external
force and cannot effectively protect heads against bruises when suffering from the
rotary impact of external force are overcome, and the protection effect of the safety
helmet on users is greatly improved.
[0006] Further in the invention, the safety helmet is structurally provided with the plastic
nail holders connected with the shell and the elastic washers connected with the elastic
liner, the plastic nail holders and the elastic washers are connected through the
plastic nails, and the plastic nails are fixed relative to the elastic washers. As
the outer diameter of the nail rods of the plastic nails is far smaller than the diameter
of the small-diameter sections of the outer step holes, the plastic nail holders and
the elastic washers can transversely slide within a certain range, part of the buffering
displacement for the shell to rotate relative to the elastic liner is formed accordingly,
the anti-disengagement buckle heads are used for preventing the nail rods from disengaging
from the plastic nail holders, and thus connection between the plastic nail holders
and the elastic washers is ensured. In the description, the inner end refers to the
end close to the elastic liner, and the outer end refers to the end, close to the
shell, of the rotary impact buffering device. Furthermore, the elastic washers can
compressively deform in the longitudinal direction or the transverse direction when
being impacted by external force, the compressive deformation in the longitudinal
direction can buffer impact in the normal direction of the safety helmet, and the
compressive deformation in the transverse direction forms the other part of the buffering
displacement for the shell to rotate relative to the elastic liner. In this way, the
plastic nail holders, the plastic nails and the elastic washers of the buffering components
are matched with the elastic liner to achieve multi-buffering protection of normal
impact force and rotary (tangential) impact force, and thus a better protection effect
is achieved. The elastic washers are connected with the plastic nail holders inlaid
in the inner side of the shell through the plastic nails, and thus assembling and
disassembling are convenient and fast.
[0007] Further in the invention, the effective contact areas between the elastic washers
and the plastic nail holders and the effective contact areas between the elastic washers
and the elastic liner can be effectively increased through the inner convex rings
and the outer convex rings, and the structural stability of the buffering components
under the effect of tangential force is improved; and under the combined effect of
the inner circular grooves and the outer circular grooves, the side walls of the elastic
washers are each of a corrugated structure, and thus the buffering performance of
the buffering components is improved.
[0008] Preferably, the contact surface between each platen and the corresponding elastic
washer is of a concave spherical structure, and the inner end face of each elastic
washer is of a convex spherical structure. The platens are matched with the elastic
washers through spherical contact, and the elastic washers are matched with the elastic
liner through spherical contact, so that the structural stability of the buffering
components under the effect of tangential force is improved, and the buffering performance
of the buffering components is improved.
[0009] As an optional example, the rotary impact buffering device comprises a plurality
of buffering assemblies. Each buffering assembly comprises a mounting plate and buffering
columns, wherein the mounting plate is provided with a plurality of columnar buffering
washers and connected with the inner side of the shell, the mounting plate is also
provided with mounting holes, the number of mounting holes is the same as that of
the buffering washers, and the buffering washers are arranged in the mounting holes
in a one-to-one corresponding mode; the number of the buffering columns is the same
as that of the buffering washers, and the buffering columns are embedded in inner
holes of the buffering washers in a one-to-one corresponding mode; and the length
of the buffering columns is smaller than the depth of the inner holes of the buffering
washers, the height of the buffering washers is greater than the thickness of the
mounting plate, and the inner ends of the buffering washers is connected with the
elastic liner. When the safety helmet of this structure is impacted by external force,
the buffering washers and the buffering columns of the buffering assemblies are matched
with the elastic liner to achieve multi-buffering protection against normal impact
force and rotary (tangential) impact force, and thus the buffering effect is good.
The mounting plate of each buffering assembly is provided with a plurality of buffering
washers connected with the inner side of the shell, the buffering columns are inlaid
in the inner holes of the buffering washers, in this way, buffering protection is
achieved through elastic deformation of the buffering washers, the elastic deformation
of the buffering washers is controlled within a certain range, and thus the buffering
washers can restore easily.
[0010] In one example, a plurality of outer circular grooves are formed in the outer periphery
of each buffering washer, a plurality of inner grooves are formed in the inner periphery
of each buffering washer, the outer grooves and the inner grooves are arranged in
a staggered mode in the axis direction of each buffering washer. Under the combined
effect of the outer grooves and the inner grooves, the side walls of the buffering
washers are each of a corrugated structure, and thus the buffering performance of
the buffering washers is improved.
[0011] In one example, counter bores are formed in the inner side of the shell, the number
of the counter bores is the same as that of the buffering washers, and the counter
bores are in one-to-one correspondence with the buffering washers; outer flanges which
are matched with the counter bores are arranged at the outer ends of the buffering
washers, inner flanges are arranged at the inner ends of the buffering washers, and
the buffering washers are connected with the elastic liner through the inner flanges.
The connection strength of the buffering washers and the shell can be improved through
the outer flanges of the buffering washers, and the connection strength of the buffering
washers and the head lock, as well as between the buffering washers and the elastic
liner, can be improved through the inner flanges of the buffering washers.
[0012] In one example, the rotary impact buffering device comprises a notch, a plurality
of elastic supporting columns and a buffering pad, wherein the notch is formed in
the inner side of the shell, the outer ends of the elastic supporting columns are
connected with the bottom surface of the notch, the buffering pad is provided with
positioning holes, the number of the positioning holes is the same as that of the
elastic supporting columns, the buffering pad is arranged in the notch, the outer
ends of the elastic supporting columns are sleeved with the positioning holes in a
one-to-one corresponding mode, and the inner ends of the elastic supporting columns
are connected with the elastic liner. Through the structure, when the safety helmet
suffers from the rotary impact of external force, the elastic supporting columns and
the buffering pad of the buffering assembly are matched with the elastic liner to
achieve multi-buffering protection against impact force and rotary impact force, and
the elastic supporting columns can restore easily through the buffering pad.
[0013] In one example, the safety helmet with a rotary impact buffering function further
comprises U-shaped buffering strips, wherein one end of each U-shaped buffering strip
is connected with the elastic liner, the other end of each U-shaped buffering strip
is connected with one end of a connecting strip, and a buckle head is arranged at
the other end of each connecting strip, buckle holes matched with the buckle heads
are formed in the inner side of the shell, and the buckle heads are correspondingly
clamped in the buckle holes. The elastic liner is integrally connected with the shell
through the U-shaped buffering strips and the connecting strips, on the one hand,
the U-shaped buffering strips can form a buffering structure between the elastic liner
and the shell, so that a buffering function is achieved when the safety helmet suffers
from tangential force, and the buffering effect is further improved when the safety
helmet is impacted by rotary force; and on the other hand, excessive sliding between
the elastic liner and the shell can be limited. The buckle heads are matched with
the buckle holes to achieve fixation, and thus disassembling and assembling are convenient.
[0014] In one example, the elastic liner is of a multi-band structure and comprises a U-shaped
liner band located on the head and an annular liner band surrounding the periphery
of the head; the number of the U-shaped buffering strips is two, and the two U-shaped
buffering strips are separately arranged on the annular liner band located on the
left side and the right side of the rear portion of the safety helmet; and two binding
strips are further correspondingly arranged at the joints of the U-shaped buffering
strips and the elastic liner, and the other ends of the binding strips are connected
with a head lock.
[0015] In one example, the U-shaped buffering strips are arranged on the left side and the
right side of the rear portion of the safety helmet, the joints of the U-shaped buffering
strips and the elastic liner are located at the same positions with the joints of
the binding strips and the elastic liner, the head lock is used for adjusting the
tightness of the binding strips, and through the proper tightness between the binding
strips and the head, the head can be protected when the safety helmet suffers from
rotary impact of external force.
[0016] The safety helmet of this example has beneficial effects. The rotary impact buffering
device is arranged between the shell and the elastic liner of the safety helmet of
this example so that tangential component force generated when the safety helmet is
impacted by external force can be greatly reduced, and impact to users from external
force is greatly reduced. Furthermore, deformation of the rotary impact buffering
device is in a set range, so that when the shell of the safety helmet rotates relative
to the elastic liner by a certain angle, the anti-rotation damping force of the rotary
impact buffering device is greatly increased, and thus the rotation angle of the shell
relative to the elastic liner is controlled within a certain range. In this way, the
defects that existing safety helmets are poor in capacity to bear the rotary impact
of external force and cannot effectively protect the head against bruises when suffering
from the rotary impact of external force are overcome, and the protection effect of
the safety helmet on users is greatly improved.
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS
[0017]
FIG. 1 is a structural sectional view of the first embodiment of the invention;
FIG. 2 is a structural sectional view of a buffering component in the first embodiment
of the invention;
FIG. 3 is a structural sectional view of the second embodiment not forming part of
the claimed invention;
FIG. 4 is a structural sectional view of a buffering assembly in the second embodiment;
FIG. 5 is a structural sectional view of the third embodiment not forming part of
the claimed invention; and
FIG. 6 is a structural bottom view of the invention.
[0018] In the FIGs: 1, shell; 2, elastic liner; 3, binding strip; 4, head lock; 5, buffering
assembly; 6, buffering washer; 7, double-faced adhesive tape; 8, mounting plate; 9,
buffering column; 10, mounting hole; 11, outer groove; 12, inner groove; 13, counter
bore; 14, outer flange; 15, inner flange; 16, buffering component; 17, outer step
hole; 18, plastic nail holder; 19, plastic nail; 20, inner step hole; 21, elastic
washer; 22, platen; 23, nail rod; 24, anti-disengaging buckle head; 25, inner convex
ring; 26, outer convex ring; 27, outer circular groove; 28, inner circular groove;
29, notch; 30, elastic supporting column; 31, positioning hole; 32, buffering pad;
33, U-shaped buffering strip; 34, buckle head; 35, connecting strip; 36, buckle hole;
37, U-shaped liner band; 38, annular liner band.
DETAILED DESCRIPTION OF THE INVENTION
[0019] A further description of the invention is given with accompanying drawings as follows.
First Embodiment
[0020] As is shown in FIG. 1 and FIG. 2, in the first embodiment of the invention, a safety
helmet with a rotary impact buffering function comprises a shell 1 and an elastic
liner 2 arranged in the shell, and the elastic liner is made of a PC board or foam.
A gap is formed between the shell and the elastic liner, and a rotary impact buffering
device enabling the shell to rotate relative to the elastic liner is arranged between
the shell and the elastic liner. The rotary impact buffering device comprises twenty-one
buffering components 16. Each buffering component comprises a plastic nail holder
18, a columnar elastic washer 21 and a plastic nail 19, wherein the plastic nail holder
is inlaid in the inner side of the shell and provided with an outer step hole 17 with
the small-diameter end located at the inner end, the elastic washer is provided with
an inner step hole 20 with the small-diameter end located at the outer end, the outer
end face of the elastic washer is tightly attached to the inner end face of the plastic
nail holder, and the elastic washer and the plastic nail holder are connected through
the plastic nail. Each plastic nail comprises a platen 22, a nail rod 23 and an anti-disengaging
buckle head 24, wherein the platen is located in the large-diameter section of the
corresponding inner step hole, the contact surface between the platen and the elastic
washer is of a concave spherical structure, the nail rod penetrates through the small-diameter
section of the corresponding inner step hole and the small-diameter section of the
corresponding outer step hole, one end of the nail rod is connected with the platen,
the diameter of the small-diameter section of the corresponding inner step hole is
matched with the outer diameter of the nail rod, and the diameter of the small-diameter
section of the corresponding outer step hole is greater than the outer diameter of
the nail rod, and the anti-disengaging buckle head is located in the large-diameter
section of the corresponding outer step hole and connected with the other end of the
nail rod. In the invention, the platen, the nail rod and the anti-disengaging buckle
head of each plastic nail are formed integrally, and the elastic washers are made
of silica gel. The inner end face of each elastic washer is of a convex spherical
structure, and the inner end face of each elastic washer is bonded with the elastic
liner. An inner convex ring 25 and an outer convex ring 26 are separately arranged
on the outer peripheries of the two ends of each elastic washer, and the elastic washers
are bonded with the elastic liner through the inner convex rings. Six outer circular
grooves 27 are formed in the outer periphery of each elastic washer between the corresponding
inner convex ring and the corresponding outer convex ring, and three inner circular
grooves 28 are formed in the inner periphery of the large-diameter section of the
inner step hole of each elastic washer.
[0021] The safety helmet with a rotary impact buffering function further comprises U-shaped
buffering strips 33, wherein one end of each U-shaped buffering strip is connected
with the elastic liner, the other end of each U-shaped buffering strip is integrally
connected with one end of a connecting strip 35, a buckle head 34 is arranged at the
other end of each connecting strip, buckle holes 36 matched with the buckle heads
are formed in the inner side of the shell, and the buckle heads are correspondingly
clamped in the buckle holes. In the embodiment, the elastic liner is of a two-band
structure and comprises a U-shaped liner band 37 located on the head and an annular
liner band 38 (as is shown in FIG.6) surrounding the periphery of the head; the number
of the U-shaped buffering strips is two, and the two U-shaped buffering strips are
separately arranged on the annular liner band located on the left side and the right
side of the rear portion of the safety helmet; and two binding strips 3 are further
correspondingly arranged at the joints of the U-shaped buffering strips and the elastic
liner, and the other ends of the binding strips are connected with a head lock 4.
Second Embodiment
[0022] As is shown in FIG. 3 and FIG. 4, in the second embodiment, the rotary impact buffering
device comprises seven buffering assemblies 5. Each buffering assembly comprises a
mounting plate 8 and buffering columns 9, wherein the mounting plate 8 is provided
with three columnar buffering washers 6 and connected with the inner side of the shell
through double-faced adhesive tape 7, the mounting plate is also provided with mounting
holes 10, the number of mounting holes is the same as that of the buffering washers
6, and the buffering washers are arranged in the mounting holes in a one-to-one corresponding
mode; the number of the buffering columns is the same as that of the buffering washers,
and the buffering columns are embedded in inner holes of the buffering washers in
a one-to-one corresponding mode; the buffering washers and the buffering columns are
made of silica gel, the length of the buffering columns is smaller than the depth
of the inner holes of the buffering washers, the height of the buffering washers is
greater than the thickness of the mounting plate, and the inner ends of the buffering
washers are bonded with the elastic liner. Three outer grooves 11 are formed in the
outer periphery of each buffering washer, two inner grooves 12 are formed in the periphery
of the inner hole side of each buffering washer, and the outer grooves and the inner
grooves are arranged in a staggered mode in the axis direction of each buffering washer.
Counter bores 13 are formed in the inner side of the shell, the number of the counter
bores is the same as that of the buffering washers, and the counter bores are in one-to-one
correspondence with the buffering washers. Outer flanges 14 which are matched with
the counter bores are arranged at the outer ends of the buffering washers, inner flanges
15 are arranged at the inner ends of the buffering washers, and the buffering washers
are bonded with the elastic liner through the inner flanges. The second embodiment
is the same as the first embodiment in other aspects.
Third Embodiment
[0023] As is shown in FIG. 5, in the third embodiment, the rotary impact buffering device
comprises a notch 29, twenty-four elastic supporting columns 30 and a buffering pad
32, wherein the notch is formed in the inner side of the shell, the outer ends of
the twenty-four elastic supporting columns are connected with the bottom surface of
the notch, the buffering pad is provided with positioning holes 31, and the number
of the positioning holes is the same as that of the elastic supporting columns; and
the buffering pad is arranged in the notch, the outer ends of the elastic supporting
columns are sleeved with the positioning holes in a one-to-one corresponding mode,
and the inner ends of the elastic supporting columns are bonded with the elastic liner.
In the embodiment, the elastic supporting columns are made of nylon, the cross section
of the elastic supporting columns is in a regular hexagon shape, and the buffering
pad 32 is made of silica gel. The third embodiment is the same as the first embodiment
in other aspects.
[0024] Tests show that compared with traditional safety helmets, the safety helmet with
a rotary impact buffering function in the three embodiments has the following advantages:
[0025] under the conditions that the falling height is 1m, the falling speed is 4.43 m/s
and the rotational accelerations at test points are 4065(r/s2), 5527 (r/s2) and 6548
(r/s2) separately, damage to the safety helmet with a rotary impact buffering function
in the three embodiments is reduced by 26.4-45.7%;
[0026] under the conditions that the falling height is 1.5m, the falling speed is 5.42 m/s
and the rotational accelerations at test points are 5683(r/s2), 6294 (r/s2) and 7094
(r/s2) separately, damage to the safety helmet with a rotary impact buffering function
in the three embodiments is reduced by 33.1-32.3%.
[0027] According to the safety helmet of the invention, the rotary impact buffering device
is arranged between the shell and the elastic liner and is capable of elastically
deforming in the normal direction of the safety helmet and also capable of elastically
deforming in the tangential direction of the safety helmet. When the safety helmet
is impacted by external force, the shell has the tendency to rotate relative to the
elastic liner under the effect of the component force applied to the shell in the
tangential direction; however, the rotary impact buffering device enabling the shell
to rotate relative to the elastic liner is arranged between the shell and the elastic
liner of the invention, through tangential deformation of the rotary impact buffering
device, the shell can rotate relative to the elastic liner by a certain angle on the
premise of keeping the elastic liner unmoved relatively, so that a rotary impact buffering
function is achieved, and the impact to users from external force is greatly reduced.
In addition, the rotary impact buffering device deforms within a certain range, after
the shell of the safety helmet rotates relative to the elastic liner by a certain
angle, the anti-rotation damping force of the rotary impact buffering device is increased
greatly, and thus the rotation angle of the shell relative to the elastic liner is
controlled within a certain range. Furthermore, the elastic liner is integrally connected
with the shell through the U-shaped buffering strips and the connecting strips, and
thus the buffering effect is further improved when the safety helmet is impacted by
rotary force. In this way, the defects that existing safety helmets are poor in capacity
to bear the rotary impact of external force and cannot effectively protected the heads
of users against bruises when suffering from the rotary impact of external force are
overcome, and the protection effect of the safety helmet on users is greatly improved.
[0028] Besides the above embodiments, those skilled in the field can create novel embodiments
by reselecting and recombining the technical characteristics or technical data of
the invention within the scope defined by the claims.