A strap retrieval device for life jackets

Abstract

This invention discloses a strap-retracting device for life jackets, comprising a housing, and a strap-retracting mechanism, a rotating mechanism, and a propulsion mechanism installed inside the housing. The housing is fixed to the hem of the life jacket, and has holes for the straps to pass through. One end of the life jacket's strap is connected to the life jacket, and the other end passes through the holes in the housing and connects to the strap-retracting mechanism. The strap-retracting mechanism includes a guide shaft, a linear bearing, a bushing, a flange nut, and a strap-retracting groove. The upper part of the guide shaft has a bushing. The linear bearing is sleeved on the guide shaft, and the inner wall of the linear bearing has a slider. The outer wall of the guide shaft has a groove, and the slider is adapted to the groove. The slider can slide within the groove, thereby driving the linear bearing to move axially along the guide shaft. The beneficial effects of this invention are: the strap-retracting device of this invention structurally and functionally couples the rotating mechanism, the propulsion mechanism, and the strap-retracting mechanism, thereby realizing the strap-retracting function of the life jacket and improving the safety factor of the life jacket.

Description

Technical Field

[0001] This invention relates to a water rescue device, specifically to a retrieval device for a life jacket. Background Technology

[0002] With the development of water transportation and water recreation, the reliability requirements for life jackets are becoming increasingly stringent. Existing life jackets are vest-like structures, consisting of a front and a rear body, each with a buoyancy chamber. The front body is a two-piece structure, comprising a left front body and a right front body, with gaps between them connected by adjustable straps and buckles to prevent the life jacket from detaching from the wearer under buoyancy and causing accidents. However, existing life jackets lack dedicated strap tightening devices, requiring manual fastening. After prolonged use in the water, the straps tend to loosen; furthermore, when the life jacket shows signs of detachment due to loose straps, the user may panic and struggle to fasten the straps quickly enough, easily leading to the life jacket leaving the user and compromising its reliability, thus causing safety issues.

[0003] Therefore, it is necessary to improve existing technologies. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a strap tightening device for life jackets, aiming to solve the problem that existing life jacket straps cannot tighten automatically.

[0005] The technical solution adopted in this invention is: a strap retraction device for a life jacket, comprising a housing, and a strap winding mechanism, a rotating mechanism, and a propulsion mechanism installed inside the housing;

[0006] The shell is fixed to the left or right front of the life jacket. The shell has a hole for the restraint strap to pass through. One end of the restraint strap is fixed to the right or left front of the life jacket, and the other end of the restraint strap passes through the hole in the shell and is connected to the winding mechanism to connect the left and right front of the life jacket.

[0007] The tape winding mechanism includes a guide shaft, a linear bearing, a bushing, a flange nut, and a tape winding slot;

[0008] The two ends of the guide shaft are respectively connected to the first bearing and the second bearing. The first bearing and the second bearing are connected and fixed to the back plate of the housing through corresponding bearing seats. The upper part of the guide shaft is provided with a bushing, which is adapted to the third bearing. The third bearing is connected to the linear bearing through a flange nut.

[0009] The linear bearing is sleeved on the guide shaft. The inner wall of the linear bearing is provided with a slider, and the outer wall of the guide shaft is provided with a groove. The slider is adapted to the groove. The slider can slide in the groove, thereby driving the linear bearing to move axially along the guide shaft.

[0010] The outer wall of the linear bearing is provided with a tape groove, and the end of the restraint strap of the life jacket is located in the tape groove;

[0011] The rotating mechanism is fixed to the back plate of the housing, and the driving end of the rotating mechanism is connected to the upper part of the guide shaft to drive and guide the rotation.

[0012] The drive end of the propulsion mechanism is connected to a linear bearing, which drives the linear bearing to move axially along the guide shaft.

[0013] The drive end of the propulsion mechanism is connected to the rotation mechanism, and the propulsion mechanism synchronously drives the rotation mechanism to move in a direction parallel to the guide shaft.

[0014] According to the above scheme, the tape slot is arranged at an angle.

[0015] According to the above scheme, the rotating mechanism includes a rotating motor base, a rotating motor, a driving gear, and a driven gear; the rotating motor is installed in the rotating motor base, the motor shaft of the rotating motor is connected to the driving gear, the driving gear meshes with the driven gear, and the driven gear is configured with a bushing.

[0016] According to the above scheme, the rotating mechanism further includes a ratchet and a pawl. The ratchet is disposed on a bushing above the driven gear. One end of the pawl is connected to the rotating motor base, and the other end of the pawl meshes with the ratchet.

[0017] According to the above scheme, the propulsion mechanism includes a propulsion motor base, a propulsion motor, a lead screw, a first nut, a first connecting rod, and a first collar; the propulsion motor base is installed on the bottom plate of the housing, the propulsion motor is located inside the propulsion motor base, the motor shaft of the propulsion motor is connected to the lower end of the lead screw, and the axes of the lead screw, the guide shaft, and the linear bearing are parallel; the first nut is adapted to the lead screw; a first sleeve is provided outside the first nut, the first sleeve is connected to the first collar through the first connecting rod, and the first collar is sleeved on the linear bearing.

[0018] According to the above scheme, the propulsion mechanism further includes a second nut, a second sleeve, a second connecting rod, and a second collar; the upper part of the lead screw is provided with a second nut, the outside of the second nut is provided with a second sleeve, the second sleeve is connected to the second collar through the second connecting rod, and the second collar is connected to the flange nut on the upper part of the linear bearing.

[0019] According to the above scheme, the first nut and the second nut move in the same direction.

[0020] According to the above scheme, both the first bearing and the second bearing are angular contact bearings.

[0021] According to the above scheme, the upper end of the lead screw passes through the rotating motor seat, and the rotating motor seat is connected to the second sleeve by a cross-grooved flat head screw.

[0022] According to the above scheme, a fourth bearing is configured at the lower end of the linear bearing, and the fourth bearing is a one-way push ball bearing.

[0023] The beneficial effects of this invention are as follows:

[0024] 1. The life jacket retraction device of the present invention couples the rotating mechanism, the propulsion mechanism and the retraction mechanism in terms of structure and function. The rotating mechanism drives the retraction slot to rotate, and the propulsion mechanism realizes the axial movement of the retraction slot, thereby realizing the life jacket retraction function. When a person falls into the water, the life jacket restraint straps can be automatically retracted, avoiding the person from losing the opportunity to tighten the restraint straps due to panic when falling into the water, thus improving the safety factor of the life jacket.

[0025] 2. The present invention is designed with a propulsion mechanism that simultaneously drives the winding mechanism to rise and fall during the winding process, which prevents the binding tape from winding in the same position, reduces winding resistance, and improves winding efficiency.

[0026] 3. The present invention designs a ratchet and pawl structure to limit the rotation direction of the guide shaft, prevent the restraint strap from retracting and loosening after being rolled up, and improve the reliability and safety of the life jacket; at the same time, the ratchet is mounted on the driven wheel, which improves the overall integrity of the device. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of a specific embodiment of the present invention (only the back plate of the housing is shown).

[0028] Figure 2 This is a schematic diagram of the rotating mechanism in this embodiment.

[0029] Figure 3 This is a schematic diagram of the propulsion mechanism in this embodiment.

[0030] Figure 4 This is a schematic diagram of the belt winding mechanism in this embodiment.

[0031] Figure 5 This is a schematic diagram illustrating the usage state of the present invention.

[0032] The components include: 1. Rotating mechanism; 1.1 Rotating motor base; 1.2 Driving gear; 1.3 Pawl; 1.4 Driven gear; 1.5 Ratchet; 2. Propulsion mechanism; 2.1 Propulsion motor base; 2.2 Cross-head countersunk screw; 2.3 Threaded screw; 2.4 First nut; 2.5 First sleeve; 2.6 Second nut; 2.7 Second sleeve; 2.8 Cross-head flat round head screw; 2.9 First collar; 2.10… 2.11 Second ring; 2.12 First connecting rod; 3. Belt winding mechanism; 3.1 First bearing; 3.2 Third bearing; 3.3 Flange nut; 3.4 Linear bearing; 3.5 Fourth bearing; 3.6 Guide shaft; 3.7 Second bearing; 3.8 Belt winding slot; 3.9 Bushing; 4. Back plate; 5. Belt winding device; 6. Left front body; 7. Right front body; 8. Rear body; 9. Restraint strap; 10. Water immersion sensor. Detailed Implementation

[0033] To better understand the present invention, it will be further described below with reference to the accompanying drawings and specific embodiments.

[0034] In this invention, such as Figure 5 As shown, the life jacket has a vest-style structure, including a front body and a rear body 8 connected to each other and each having a buoyancy cavity. The front body has a segmented structure, including a left front body 6 and a right front body 7, with a gap between the left and right front bodies. The left front body 6 and the right front body 7 are connected by restraint straps 9.

[0035] like Figure 1 The illustrated retractor 5 for a life jacket specifically refers to a retractor for tightening the life jacket's restraint straps. It includes a housing, and a winding mechanism 3, a rotating mechanism 1, and a propulsion mechanism 2 installed inside the housing. Figure 4 As shown,;

[0036] The shell is fixed to the left front body 3 or the right front body 7 of the life jacket (specifically located at the connection between the left and right front bodies). The shell has a hole for the restraint strap 9 to pass through. One end of the restraint strap 9 is fixed to the right front body 7 or the left front body 6 of the life jacket. The other end of the restraint strap 9 passes through the hole in the shell and is connected to the winding mechanism 3, connecting the left front body 6 and the right front body 7 of the life jacket.

[0037] The tape winding mechanism 3 includes a guide shaft 3.6, a linear bearing 3.4, a bushing 3.9, a flange nut 3.3, and a tape winding groove 3.8;

[0038] The two ends of the guide shaft 3.6 are connected to the first bearing 3.1 and the second bearing 3.7 respectively. The first bearing 3.1 and the second bearing 3.7 are connected and fixed to the back plate 4 of the housing through corresponding bearing seats. The upper part of the guide shaft 3.6 is provided with a bushing 3.9, which is adapted to the third bearing 3.2. The third bearing 3.2 is connected to the linear bearing 3.4 through a flange nut 3.3.

[0039] The linear bearing 3.4 is sleeved on the guide shaft 3.6. The inner wall of the linear bearing 3.4 is provided with a slider, and the outer wall of the guide shaft 3.6 is provided with a groove. The slider is adapted to the groove. The slider can slide in the groove, thereby driving the linear bearing 3.4 to move along the axial direction of the guide shaft 3.6.

[0040] The outer wall of the linear bearing 3.4 is provided with a tape groove 3.8, and the end of the life jacket's restraint strap 9 is located in the tape groove 3.8;

[0041] The driving end of the rotating mechanism 1 is connected to the upper part of the guide shaft 3.6, driving the guide shaft 3.6 to rotate;

[0042] The drive end of the propulsion mechanism 2 is connected to the linear bearing 3.4, driving the linear bearing 3.4 to move axially along the guide shaft 3.6;

[0043] The drive end of the propulsion mechanism 2 is connected to the rotation mechanism 1, and the propulsion mechanism 2 can synchronously drive the rotation mechanism 1 to move in a direction parallel to the guide shaft 3.6.

[0044] In this invention, the driving end of the rotating mechanism 1 drives the bushing 3.9 to rotate, and the bushing 3.9 drives the guide shaft 3.6 to rotate; the bushing 3.9 drives the linear bearing 3.4 to rotate through the inner ring of the third bearing 3.2 and the flange nut 3.3; the linear bearing 3.4 and the guide shaft 3.6 are connected by a slider and a groove, which can achieve synchronous rotation and allow the linear bearing 3.4 to move axially along the guide shaft 3.6, so as to realize the non-positional winding of the life jacket restraint strap 9, and at the same time effectively prevent the restraint strap 9 from winding at the same position of the linear bearing 3.4, causing the roll diameter to be too large and jamming.

[0045] In this invention, the guide shaft 3.6 and the linear bearing 3.4 are coaxially configured.

[0046] In this invention, the linear bearing 3.4 and the guide shaft 3.6 are connected by a slider and a groove, which can prevent the linear bearing 3.4 and the guide shaft 3.6 from rotating relative to each other and damaging the mechanism.

[0047] In this invention, both the first bearing 3.1 and the second bearing 3.7 are angular contact bearings.

[0048] In this invention, a fourth bearing 3.5 is provided at the lower end of the linear bearing 3.4. The fourth bearing 3.5 is a one-way push ball bearing, which can ensure that the guide shaft 3.6 and the winding linear bearing 3.4 can rotate in one direction with relative stationary position.

[0049] Preferably, the tape slot 3.8 is arranged at an angle to ensure that the binding strap 9 does not stack during tape winding.

[0050] Preferably, such as Figure 2 As shown, the rotating mechanism 1 includes a rotating motor base 1.1, a rotating motor, a driving gear 1.2, and a driven gear 1.4; the rotating motor is installed in the rotating motor base 1.1, the motor shaft of the rotating motor is connected to the driving gear 1.2, the driving gear 1.2 meshes with the driven gear 1.4, and the driven gear 1.4 is configured with the bushing 3.9.

[0051] In this invention, the rotating motor drives the driving gear 1.2 to rotate, and the driven gear 1.4 rotates accordingly, which in turn drives the guide shaft 3.6 and the linear bearing 3.4 to rotate through the bushing 3.9.

[0052] Preferably, the rotating mechanism 1 further includes a ratchet 1.5 and a pawl 1.3. The ratchet 1.5 is disposed on the bushing 3.9 above the driven gear 1.4; one end of the pawl 1.3 is connected to the rotating motor base, and the other end of the pawl 1.3 is engaged with the ratchet 1.5.

[0053] In this invention, the ratchet 1.5 and the pawl 1.3 are engaged. When the wound binding tape 9 retracts and the guide shaft 3.6 has a tendency to reverse, the pawl 1.3 will lock the ratchet 1.5, thereby preventing the rotating mechanism 1 from slipping after power failure and ensuring the unidirectionality of the tape winding.

[0054] In this invention, the ratchet 1.5 is mounted on the driven gear 1.4, which serves to improve the overall strength of the strap-reeling device used for life jackets.

[0055] Preferably, such as Figure 3 As shown, the propulsion mechanism 2 includes a propulsion motor base 2.1, a propulsion motor, a lead screw 2.3, a first nut 2.4, a first connecting rod 2.11, and a first collar 2.9. The propulsion motor base 2.1 is mounted on the bottom plate of the housing, and the propulsion motor is located inside the propulsion motor base 2.1 (the two are connected by a cross-slot countersunk screw 2.2). The motor shaft of the propulsion motor is connected to the lower end of the lead screw 2.3, and the axes of the lead screw 2.3, the guide shaft 3.6, and the linear bearing 3.4 are parallel. The first nut 2.4 is adapted to the lead screw 2.3. A first sleeve 2.5 is provided on the outside of the first nut 2.4. The first sleeve 2.5 is connected to the first collar through the first connecting rod 2.11, and the first collar 2.9 is sleeved on the linear bearing 3.4.

[0056] In this invention, when the propulsion motor drives the lead screw 2.3 to rotate, the first nut 2.4 drives the first sleeve 2.5 to move axially along the lead screw 2.3, and through the first connecting rod 2.11 and the first collar 2.9, drives the linear bearing 3.4 to move axially along the guide shaft 3.6.

[0057] Preferably, the propulsion mechanism 2 further includes a second nut 2.6, a second sleeve 2.7, a second connecting rod 2.12, and a second collar 2.10; the second nut 2.6 is disposed on the upper part of the lead screw 2.3, and the second sleeve 2.7 is disposed on the outside of the second nut 2.6. The second sleeve 2.7 is connected to the second collar 2.10 through the second connecting rod 2.12, and the second collar 2.10 is connected to the flange nut 3.3 on the upper part of the linear bearing 3.4; when the propulsion motor drives the lead screw 2.3 to rotate, the second nut 2.6 drives the second sleeve 2.7 to move axially along the lead screw 2.3, and drives the flange nut 3.3 to move through the second connecting rod 2.12 and the second collar 2.10, which in turn drives the linear bearing 3.4 to move axially along the guide shaft 3.6.

[0058] In this invention, the first nut 2.4 and the second nut 2.6 move in the same direction.

[0059] In this invention, the upper end of the lead screw 2.3 passes through the rotating motor seat 1.1, and the rotating motor seat 1.1 is connected to the second sleeve 2.7 by a cross-grooved flat round head screw 2.8. The rotating mechanism 1 as a whole can move along the axial direction of the lead screw 2.3.

[0060] In this invention, the life jacket is also equipped with a water immersion sensor 10, which is fixed to the front of the life jacket and is used to detect whether the reeling device has fallen into the water; when the water immersion sensor 10 detects that the reeling device has fallen into the water, it starts the rotation motor and the propulsion motor.

[0061] The strap retraction device of the present invention is fixed on the life jacket. The life jacket has buckles on the strap 9 for restricting the retraction. Before use, the position of the buckles is adjusted according to the user. On the one hand, this avoids the strap 9 not being retracted properly, so that the life jacket can not play a life-saving role. On the other hand, it avoids the strap 9 being retracted too tightly, so as to reduce comfort.

[0062] The working principle of this invention is as follows: After the user enters the water wearing a life jacket, the water immersion sensor 10 detects the water immersion signal and starts the rotating motor and the propulsion motor of the take-up device. The motor shaft of the rotating motor drives the bushing 3.9 to rotate, and the bushing 3.9 drives the guide shaft 3.6 to rotate. At the same time, the bushing 3.9 drives the linear bearing 3.4 to rotate synchronously through the inner ring of the third bearing 3.2 and the flange nut 3.3. The motor shaft of the propulsion mechanism 2 drives the lead screw 2.3 to rotate, and the two nuts that cooperate with the lead screw 2.3 move axially along the lead screw 2.3. Through the connecting rod and the collar, the linear bearing 3.4 moves axially along the guide shaft 3.6. The binding strap 9, whose end is connected to the tape groove 3.8, is then wound up.

[0063] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0064] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. However, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A take-up device for a lifejacket, characterized in that The shell, the tape winding mechanism, the rotating mechanism and the advancing mechanism are arranged in the shell. The shell is fixed on the left or right front body of the life jacket, and a belt hole is arranged on the shell for the binding belt to pass through. The tape winding mechanism comprises a guide shaft, a linear bearing, a shaft sleeve, a flange nut and a tape clamping groove. The guide shaft is connected with the first bearing and the second bearing at two ends, and the first bearing and the second bearing are fixed on the back plate of the shell through corresponding bearing seats. The upper part of the guide shaft is provided with the shaft sleeve, and the shaft sleeve is matched with the third bearing. The inner wall of the linear bearing is provided with a sliding block, and the outer wall of the guide shaft is provided with a sliding groove. The sliding block is matched with the sliding groove. The outer wall of the linear bearing is provided with the tape clamping groove, and the end of the binding belt of the life jacket is arranged in the tape clamping groove. The driving end of the rotating mechanism is connected with the upper part of the guide shaft. The driving end of the advancing mechanism is connected with the linear bearing.

2. A strap retraction device for a lifejacket as claimed in claim 1, characterised in that, The driving end of the advancing mechanism is connected with the rotating mechanism.

3. A take-up device for a life jacket according to claim 1 or 2, characterized in that The advancing mechanism drives the rotating mechanism to move in the direction parallel to the guide shaft.

4. The strap retractor for a life vest according to claim 3, wherein The buckle is arranged on the binding belt of the life jacket to limit the winding of the belt.

5. The belt take-up device for a life jacket according to any one of claims 1, 2, 4, characterized in that, The tape clamping groove is arranged obliquely.

6. A strap retractor for a life jacket as defined in claim 5, characterized in that The rotating mechanism comprises a rotating motor seat, a rotating motor, a driving gear and a driven gear.

7. A strap retractor for a life jacket as defined in claim 6, characterized in that The rotating motor is arranged in the rotating motor seat, the motor shaft of the rotating motor is connected with the driving gear, the driving gear is engaged with the driven gear, and the driven gear is arranged on the shaft sleeve.

8. The strap retractor for a life vest as defined in claim 5, wherein The rotating mechanism further comprises a ratchet wheel and a pawl.

9. The strap retractor for a life vest as defined in claim 5, wherein The pawl is connected with the rotating motor seat at one end and engaged with the ratchet wheel at the other end. The advancing mechanism comprises an advancing motor seat, an advancing motor, a screw rod, a first nut, a first connecting rod and a first sleeve ring. The advancing motor seat is arranged on the bottom plate of the shell, the advancing motor is arranged in the advancing motor seat, the motor shaft of the advancing motor is connected with the lower end of the screw rod, the axes of the screw rod, the guide shaft and the linear bearing are parallel, the first nut is matched with the screw rod, the outer part of the first nut is provided with a first sleeve, the first sleeve is connected with the first sleeve ring through the first connecting rod, and the first sleeve ring is arranged on the linear bearing. The advancing mechanism further comprises a second nut, a second sleeve, a second connecting rod and a second sleeve ring. The upper part of the screw rod is arranged with the second nut, the outer part of the second nut is provided with the second sleeve, the second sleeve is connected with the second sleeve ring through the second connecting rod, and the second sleeve ring is connected with the flange nut on the upper part of the linear bearing. The moving directions of the first nut and the second nut are consistent. The first bearing and the second bearing are angular contact bearings. The lower end of the linear bearing is arranged with a fourth bearing, and the fourth bearing is a one-way thrust ball bearing.

10. The strap retractor for a life vest as defined in claim 5, wherein The upper end of the screw rod passes through a rotating motor base, and the rotating motor base is connected with the second sleeve through a cross-cut groove and a flat round head screw.

Images