CA1038844A - Blocking device preferably for reel-type safety belts for vehicles - Google Patents
Blocking device preferably for reel-type safety belts for vehiclesInfo
- Publication number
- CA1038844A CA1038844A CA233,840A CA233840A CA1038844A CA 1038844 A CA1038844 A CA 1038844A CA 233840 A CA233840 A CA 233840A CA 1038844 A CA1038844 A CA 1038844A
- Authority
- CA
- Canada
- Prior art keywords
- pawl
- blocking
- ratchet wheel
- blocking device
- arm
- 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.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R22/00—Safety belts or body harnesses in vehicles
- B60R22/34—Belt retractors, e.g. reels
- B60R22/36—Belt retractors, e.g. reels self-locking in an emergency
- B60R22/40—Belt retractors, e.g. reels self-locking in an emergency responsive only to vehicle movement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R22/00—Safety belts or body harnesses in vehicles
- B60R22/34—Belt retractors, e.g. reels
- B60R22/343—Belt retractors, e.g. reels with electrically actuated locking means
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Automotive Seat Belt Assembly (AREA)
- Transmission Devices (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
Blocking device for vehicle reel-type safety belts comprising a rotatably mounted ratchet wheel having teeth and capable of being connected to the reels of the safety belts, and a pivotally mounted blocking pawl positioned for at times engaging the teeth of the ratchet wheel for preventing rotation of the ratchet wheel in one direction. Actuating means are provided to operate upon an abnormal change of speed of the vehicle, a pivotally mounted auxiliary pawl being positioned for being pivoted by the actuating means into engagement with the teeth and pivoting the blocking pawl into engagement with the teeth upon acuation of the actuating means. Resilient means tend to retain the auxi-liary pawl into engagement with the actuating means.
Blocking device for vehicle reel-type safety belts comprising a rotatably mounted ratchet wheel having teeth and capable of being connected to the reels of the safety belts, and a pivotally mounted blocking pawl positioned for at times engaging the teeth of the ratchet wheel for preventing rotation of the ratchet wheel in one direction. Actuating means are provided to operate upon an abnormal change of speed of the vehicle, a pivotally mounted auxiliary pawl being positioned for being pivoted by the actuating means into engagement with the teeth and pivoting the blocking pawl into engagement with the teeth upon acuation of the actuating means. Resilient means tend to retain the auxi-liary pawl into engagement with the actuating means.
Description
~L~3S~44 The present invention relates to a blocking dèvice preferably for so called reel-type safety belts for vehicles.
In connection with blocking devices of the kind mentioned it has turned out that there is a risk of the blocking pawl not arriving in a position of complete engagement with the teeth o~ the ratchet wheel, and instead gets stuck at the point of one of the teeth, which involves the risk of the blocking pawl, when heavily loaded, loosing its grip of engagement, so that the ratchet wheel will pivot a certain distance before the blocking pawl again can be engaged. The sharp edges of the blocking pawl and the points of the teeth are then subjected to a considerable wear resulting in further deterioration of their function.
It is an object of the present invention to eliminate the above-mentioned drawbacks.
Therefore, according to the present invention, there is provided a blocking device for vehicle reel-type safety belts comprising a rotatably mounted ratchet wheel having teeth and capable of being connected to the reels of the safety belts, and a pivotally mounted blocking pawl positioned for at times engaging a pivotally mounted blocking pawl positioned for at times engaging the teeth of the ratchet wheel for preventing rotation of said ratchet wheel in one direction. Actuating means are providèd to operate upon an abnormal change o speed of the vehicle, a pivotally mounted axiliary pawl being positioned for being pivoted by the actuating means into engagement with the teeth and pivoting the blocking pawl into engagement with the teeth upon actuation of the actuating means. Resilient means tend to retain the auxilia-ry pawl into engagement with the actuating means.
The invention will now be described more in detail in connection with a few examples of embodiment, reference being made to the accompanying schematic drawings, in which ~k ~ ~ .
8~4 Fig~ 1-4 illustrate the blocking device according to the invention in different posit~ons according to a first em-bodiment, Fig. 5 is a varied embodiment with a pendulum, which requires exceptionally little space for its accomodation, Fig. 6 is another embodiment, in which the actuation means comprises a ball, Fig. 7 is a still further example of the block-ing device according to the invention, in which the actuation means comprises an electro magnet, Fig. 8 and 9 show one more embodiment of the blocking device according to the invention, Fig. 10-12 illustrate a first embodiment of a first device intended to give a locking pawl in general distinct positions but which with advantage can be used in connection with the auxiliary pawl according to the embodiments which are shown in Fig~ 1-9, and Fig. 13 shows a further embodiment of the lock-ing device which-is shown in Fig 10-12.
As is evident from the example of embodiment illustrated in the Fig. 1-4 the blocking device comprises a ratchet wheell which its axis 2 is rotatably mounted in a schematically hinted blocking house 3 and which is provided with teeth 4 designed in such a manner that they impede rotation of the ratchet wheel in one direction in connection with an engagement of the blocking pawl 5 with the teeth of the wheel. The blocking pawl 5 is pivo-tably bearing against the bottom of a pocket 6 of the block house 3 and its engagement end is designed with an oblique blocking sur-face 7. An actuation organ 8 enters into the assembly of the block-3~ ing device serving the purpose to actuate the blocking pawl 5,said organ in the present example of embodiment comprising a sus-, ....~ .
~0~8~
pended pendulum, thus being of the type sensitive to acceleration, :in the first place inteded for use in connection with so called reel-type safety belts, in which the blocking device according to the invention is intended for use in order to impede the unwinding of the band of the safety belt, when an unnormal change of - 2a -s speed of a vehicle takes place. In this particular case the pen-dulum comprises a body of inertia 9, which via an arm 10 is rigidly connected with a plate 11, which in normal position rests in a seat 12 in the blocking house 3.
Between the pendulum 8 and the blocking pawl 5 in the design according to the invention an auxiliary blocking pawl 31 is incor-porated, which auxiliary pawl via a pressure spring 14 is connected with the blocking house 3 being pivotably mounted round the point 15 of attachement of the spring at one end of said auxiliary pawl, /0 against which the engagement end of the blocking pawl 5 is arranged to bear in rest position. At its opposite end the auxiliary pawl 13 is shaped with a hook 16, the underside of which rests against the top side of the plate 11 of the pendulum 8.
Assuming that the blocking device according to the invention illustrated in the Fig. 1-4 enters into the assembly of a reel-type safety belt mounted in a vehicle, the following will occur in case of' an unnormal change of speed of the vehicle, by way of example a sudden braking action or collision. By the action of the body of inertia 9 the pendulum 8 will pivot, whereby the plate 11 tilts in ~0 its seat 12, which brings in its train that the end of the auxiliary pawl, which is shaped as a hook and bears against the plate 11, is brought in upwards direction towards the ratchet wheel 1 and into engagement with the teeth 4 of this wheel. When the ratchet wheel 1 starts rotating in the direction of the arrow indica-ted with 17 due to a pull in the band of -the safety belt, the auxiliary pawl 13 against bias of the spring 14 is brought under the pawl 5, which thereby is pivoted upwards towards the ratchet wheel 1 and into a quick engagement into the space between two teeth, its blocking surface 7 bearing against one of the blocking surfaces 19 of the 3 o teeth 4. As is evident from Fig. 4 the blocking pawl 5 will engage the tooth 4, which is located nearest to the tooth engaged by the ~ _3_ ~V3~8~4 auxiliary pawl 13. Because of the non-yielding support of the --blocking pawl 5 in the pocket 6, the ratchet wheel is thereby blocked against further rotation in said direction. When said unnormal actuation upon the vehicle has ceased, and the band of the safety belt has been relieved of its load, the auxiliary pawl 13 by actuation of the spring 14 is returned to its normal position ;~
resting upon the plate 11, when then rests in its seat 12, whereby the blocking pawl 5 pivots down to its normal posi-tion (see Fig. 1).
In the example of embodiment of the blocking device illustrated in Fig. 5 the downhanging ball of the pendulum has been substituted by an upright standing pendulum, which from the plate 11 extends in circular shape round the periphery of the ratchet wheel 1.
In Fig. 6 an example of embodiment is shown, in whlch the pen-dulum -3a-1~38844 is substituted by a ball 21 resting in a cup 20, said ball being arranged in case of a strong acceleration to pivot a lever arm 22, which is pivotably mounted in the blocking house 3 below the hook 16 of the auxiliary pawl and resting against the ball.
In Fig. 7 an example of actuation means of non-acceleration sensing type is illustrated, as it comprises an electromagnet 23, which can be controlled by closing a circuit, said electromagnet being arranged by means of a lever arm 24 to bring the auxiliary pawl 13 into engagement with the rathcet wheel 1.
/o In the embodiment of the blocking device described above the auxiliary pawl 13 brings the pawl 5 to pivot upwards against the ratchet wheel 1 with the end of said auxiliary pawl bearing against the blocking pawl 5, whereby said end is pressed in between the blocking pawl 5 and an oblique guiding surface 25 in the blocking house 3. In the Fig. 8 and 9 another example is shown of the design o~ the auxiliary pawl 13 and consequently also of its actuation of the blocking pawl 5. In this example the auxiliary pawl 13 is provided with a pivotable arm 26, which by way of example is jour-naled in the shaft 2 of the ratchet wheel, and in which arm the ~0 hook 16 of the auxiliary pawl is pivotably mounted. This arm 26 is pivotably against the blocking pawl 5 against the bias of a ten~
sion spring 27, and in its lower portion it is shaped wi-th a suppor-ting edge 28, which passes over into a recess 29. In its engaging end the blocking pawl 5 is provided with a projection, which in the normal position bears against the supporting edge 28 of the arm 26 (see Fig. 8). In case of an unnormal change of speed of the vehicle the pendulum 8 is brought to pivot in one direction, whereby the auxiliary pawl 13 is brought into engagement with the ratchet wheel and is carried along,,whereby the arm 26 is pivoted and the pro-jection on the blocking pawl 5 is inserted into the recess 29, i.e.the blocking pawl 5 is pivoted to engagement with the ratchet wheel, which takes place by actuation of a spring 31.
~$ _aS_ ~3~844 A common feature of the different embodiments is the fact that the mechanism is dimensioned in such a manner that the blocking pawl 5 quickly is inserted into the space berween two teeth, the distance between the attacking ends of the two pawls in engagement position sui-tably being substantially a multiple of the tooth pitch of the ratchet wheel 1.
The blocking device îllustrated in Fig. 11 comprises a pawl 104, pivotably mounted at an axia 103, which can block the ratchet wheel 1 against rotation in one direction. The blocking pawl 104 can preferably be comprised in the embodiments according to Fig.
1-9 substituting the auxiliary pawl 13, whereby the axle 103 is substituted by the attachment point 15 of the spring member 14.
On a foundation 105 an actuation organ 7 in -4a--~3~3~344 the form of a pendulum is suspended by means of a plate 106, which organ thus is of a type sensitive to acceleration and arranged to change position by way of example, when an unnormal change of speed of a vehicle takes place, in which vehicle the blocking device forms part of a reel-type safety belt assembly. In order to sense the position of the pendulum 107 and to transmit a force to the pawl 104 at its pivoting movement between a releasing position and a blocking position, a power transmission means 108 is arranged according to the invention, which means comprises an arm 110 pivotably mounted on an /o axis 109, which arm with its movable end is arranged to bear against the top side of the plate 106 of the pendulum 107, and a spring 111, which in the example illustrated in the Fig. 10-12 comprises a pres-sure spring, a so called omega-spring. Said spring is stretched between the arm 110 and the pawl 104 in such a manner that the line of direction along which the force acts upon the pawl 104 in the normal position (see Fig. 10) is between the axis 103 of the pawl and the ratchet wheel 1. The force, which the pressure spring 111 excercises upon the arm 110 applied in such a manner that the line of direction along which it acts all the time is beneath the axis O 109 of the arm, whereby this force tends to keep the arm pivoted down into the normal position illustrated in Fig. 10. The pivoting movement of the arm 110 is upwards limited by a stop dog 112.
When the blocking device is in the normal position illustrated in Fig. 10, the pawl 104 thus is kept in releasing position, as the force acting upon the pawl 104 attacks along a line of direction located above the axis 103 because of the fact that the pendulum 107 is in a rest position and conse~uently the arm in its lower end position. In case of an unnormal change of movement of the vehicle, where the blocking device according to the invention is ins-talled, 3 ~ the pendulum pivots into the position illustrated in Fig. 11J where-by the plate 106 pivots the arm 110, which bears against its top ~ _5_ ~1~3~3844 side, in upward direction round its axis 109 against the stop dog 112 at its upper end position. By the pressure spring 111 following the arm 110 in its pivoting movement, a change of direction of the force acting upon the pawl 104 is taking place, so that the line of direction of the force will be beneath the axis 103 of the pawl, which brings in its train that the pawl distinctly is pivoting over to the blocking position with its engaging end 104 engaging the teeth 2 of the ratchet wheel 1.
After the unnormal change of speed of the vehicle has ceased, and the pendulum 107 again occupied its rest position, in which the arm 110 by the bias of the spring 111 is pivo-ted down, the pawl 104 remains in its blocking position (see the position indicated by a continuous line in Fig.
-5a-` 1'~3~844 12). The spring force acting on the pawl 104 in spite of the downwards pivoting of the arm 110 is namely still directed with its line o~ direction located beneath the pivoting axis 103 of the pawl. As soon as the ratchet wheel 1 is turned in its dir-ection opposing the blocking direction, the nearest tooth 2 of the the ratchet wheel will bring the pawl 104 out of engagement, whereby the direction of` the spring force acting upon the pawl is changed, so that its line of direction is moved upwards above the axis 103 resulting in a distinct downwards pivoting movement of the pawl into its releasing position, which in the Fig. 12 is indica-ted with a dashed and dotted line.
In the embodiment which is illustrated in Fig. 13 -the required spring force is provided by means of a tension spring 113. In comparison with the described example above, the arm 110 in this embodiment is revorsed and the point of attachment 114 of the spring 113 on the pawl 10~ has been displaced to a point beyond the axis 103, whereby in principal a corresponding Eunction is obtained.
However, the forces between the arm 110 and the pawl 10~ are pulling forces, whereby their lines of direction relative to the axis 103 of the pawl will get an opposite location compared wi-th the example of embodiment with a pressure spring.
The invention is not limited to the examples of embodimen-t described above and illus-trated in the drawing, but can be varied within the scope of the following claims. By way o~ example one can imagine the actuation organ 107 to be of a di~erent type, in which connection also the arm may be of another design.
In connection with blocking devices of the kind mentioned it has turned out that there is a risk of the blocking pawl not arriving in a position of complete engagement with the teeth o~ the ratchet wheel, and instead gets stuck at the point of one of the teeth, which involves the risk of the blocking pawl, when heavily loaded, loosing its grip of engagement, so that the ratchet wheel will pivot a certain distance before the blocking pawl again can be engaged. The sharp edges of the blocking pawl and the points of the teeth are then subjected to a considerable wear resulting in further deterioration of their function.
It is an object of the present invention to eliminate the above-mentioned drawbacks.
Therefore, according to the present invention, there is provided a blocking device for vehicle reel-type safety belts comprising a rotatably mounted ratchet wheel having teeth and capable of being connected to the reels of the safety belts, and a pivotally mounted blocking pawl positioned for at times engaging a pivotally mounted blocking pawl positioned for at times engaging the teeth of the ratchet wheel for preventing rotation of said ratchet wheel in one direction. Actuating means are providèd to operate upon an abnormal change o speed of the vehicle, a pivotally mounted axiliary pawl being positioned for being pivoted by the actuating means into engagement with the teeth and pivoting the blocking pawl into engagement with the teeth upon actuation of the actuating means. Resilient means tend to retain the auxilia-ry pawl into engagement with the actuating means.
The invention will now be described more in detail in connection with a few examples of embodiment, reference being made to the accompanying schematic drawings, in which ~k ~ ~ .
8~4 Fig~ 1-4 illustrate the blocking device according to the invention in different posit~ons according to a first em-bodiment, Fig. 5 is a varied embodiment with a pendulum, which requires exceptionally little space for its accomodation, Fig. 6 is another embodiment, in which the actuation means comprises a ball, Fig. 7 is a still further example of the block-ing device according to the invention, in which the actuation means comprises an electro magnet, Fig. 8 and 9 show one more embodiment of the blocking device according to the invention, Fig. 10-12 illustrate a first embodiment of a first device intended to give a locking pawl in general distinct positions but which with advantage can be used in connection with the auxiliary pawl according to the embodiments which are shown in Fig~ 1-9, and Fig. 13 shows a further embodiment of the lock-ing device which-is shown in Fig 10-12.
As is evident from the example of embodiment illustrated in the Fig. 1-4 the blocking device comprises a ratchet wheell which its axis 2 is rotatably mounted in a schematically hinted blocking house 3 and which is provided with teeth 4 designed in such a manner that they impede rotation of the ratchet wheel in one direction in connection with an engagement of the blocking pawl 5 with the teeth of the wheel. The blocking pawl 5 is pivo-tably bearing against the bottom of a pocket 6 of the block house 3 and its engagement end is designed with an oblique blocking sur-face 7. An actuation organ 8 enters into the assembly of the block-3~ ing device serving the purpose to actuate the blocking pawl 5,said organ in the present example of embodiment comprising a sus-, ....~ .
~0~8~
pended pendulum, thus being of the type sensitive to acceleration, :in the first place inteded for use in connection with so called reel-type safety belts, in which the blocking device according to the invention is intended for use in order to impede the unwinding of the band of the safety belt, when an unnormal change of - 2a -s speed of a vehicle takes place. In this particular case the pen-dulum comprises a body of inertia 9, which via an arm 10 is rigidly connected with a plate 11, which in normal position rests in a seat 12 in the blocking house 3.
Between the pendulum 8 and the blocking pawl 5 in the design according to the invention an auxiliary blocking pawl 31 is incor-porated, which auxiliary pawl via a pressure spring 14 is connected with the blocking house 3 being pivotably mounted round the point 15 of attachement of the spring at one end of said auxiliary pawl, /0 against which the engagement end of the blocking pawl 5 is arranged to bear in rest position. At its opposite end the auxiliary pawl 13 is shaped with a hook 16, the underside of which rests against the top side of the plate 11 of the pendulum 8.
Assuming that the blocking device according to the invention illustrated in the Fig. 1-4 enters into the assembly of a reel-type safety belt mounted in a vehicle, the following will occur in case of' an unnormal change of speed of the vehicle, by way of example a sudden braking action or collision. By the action of the body of inertia 9 the pendulum 8 will pivot, whereby the plate 11 tilts in ~0 its seat 12, which brings in its train that the end of the auxiliary pawl, which is shaped as a hook and bears against the plate 11, is brought in upwards direction towards the ratchet wheel 1 and into engagement with the teeth 4 of this wheel. When the ratchet wheel 1 starts rotating in the direction of the arrow indica-ted with 17 due to a pull in the band of -the safety belt, the auxiliary pawl 13 against bias of the spring 14 is brought under the pawl 5, which thereby is pivoted upwards towards the ratchet wheel 1 and into a quick engagement into the space between two teeth, its blocking surface 7 bearing against one of the blocking surfaces 19 of the 3 o teeth 4. As is evident from Fig. 4 the blocking pawl 5 will engage the tooth 4, which is located nearest to the tooth engaged by the ~ _3_ ~V3~8~4 auxiliary pawl 13. Because of the non-yielding support of the --blocking pawl 5 in the pocket 6, the ratchet wheel is thereby blocked against further rotation in said direction. When said unnormal actuation upon the vehicle has ceased, and the band of the safety belt has been relieved of its load, the auxiliary pawl 13 by actuation of the spring 14 is returned to its normal position ;~
resting upon the plate 11, when then rests in its seat 12, whereby the blocking pawl 5 pivots down to its normal posi-tion (see Fig. 1).
In the example of embodiment of the blocking device illustrated in Fig. 5 the downhanging ball of the pendulum has been substituted by an upright standing pendulum, which from the plate 11 extends in circular shape round the periphery of the ratchet wheel 1.
In Fig. 6 an example of embodiment is shown, in whlch the pen-dulum -3a-1~38844 is substituted by a ball 21 resting in a cup 20, said ball being arranged in case of a strong acceleration to pivot a lever arm 22, which is pivotably mounted in the blocking house 3 below the hook 16 of the auxiliary pawl and resting against the ball.
In Fig. 7 an example of actuation means of non-acceleration sensing type is illustrated, as it comprises an electromagnet 23, which can be controlled by closing a circuit, said electromagnet being arranged by means of a lever arm 24 to bring the auxiliary pawl 13 into engagement with the rathcet wheel 1.
/o In the embodiment of the blocking device described above the auxiliary pawl 13 brings the pawl 5 to pivot upwards against the ratchet wheel 1 with the end of said auxiliary pawl bearing against the blocking pawl 5, whereby said end is pressed in between the blocking pawl 5 and an oblique guiding surface 25 in the blocking house 3. In the Fig. 8 and 9 another example is shown of the design o~ the auxiliary pawl 13 and consequently also of its actuation of the blocking pawl 5. In this example the auxiliary pawl 13 is provided with a pivotable arm 26, which by way of example is jour-naled in the shaft 2 of the ratchet wheel, and in which arm the ~0 hook 16 of the auxiliary pawl is pivotably mounted. This arm 26 is pivotably against the blocking pawl 5 against the bias of a ten~
sion spring 27, and in its lower portion it is shaped wi-th a suppor-ting edge 28, which passes over into a recess 29. In its engaging end the blocking pawl 5 is provided with a projection, which in the normal position bears against the supporting edge 28 of the arm 26 (see Fig. 8). In case of an unnormal change of speed of the vehicle the pendulum 8 is brought to pivot in one direction, whereby the auxiliary pawl 13 is brought into engagement with the ratchet wheel and is carried along,,whereby the arm 26 is pivoted and the pro-jection on the blocking pawl 5 is inserted into the recess 29, i.e.the blocking pawl 5 is pivoted to engagement with the ratchet wheel, which takes place by actuation of a spring 31.
~$ _aS_ ~3~844 A common feature of the different embodiments is the fact that the mechanism is dimensioned in such a manner that the blocking pawl 5 quickly is inserted into the space berween two teeth, the distance between the attacking ends of the two pawls in engagement position sui-tably being substantially a multiple of the tooth pitch of the ratchet wheel 1.
The blocking device îllustrated in Fig. 11 comprises a pawl 104, pivotably mounted at an axia 103, which can block the ratchet wheel 1 against rotation in one direction. The blocking pawl 104 can preferably be comprised in the embodiments according to Fig.
1-9 substituting the auxiliary pawl 13, whereby the axle 103 is substituted by the attachment point 15 of the spring member 14.
On a foundation 105 an actuation organ 7 in -4a--~3~3~344 the form of a pendulum is suspended by means of a plate 106, which organ thus is of a type sensitive to acceleration and arranged to change position by way of example, when an unnormal change of speed of a vehicle takes place, in which vehicle the blocking device forms part of a reel-type safety belt assembly. In order to sense the position of the pendulum 107 and to transmit a force to the pawl 104 at its pivoting movement between a releasing position and a blocking position, a power transmission means 108 is arranged according to the invention, which means comprises an arm 110 pivotably mounted on an /o axis 109, which arm with its movable end is arranged to bear against the top side of the plate 106 of the pendulum 107, and a spring 111, which in the example illustrated in the Fig. 10-12 comprises a pres-sure spring, a so called omega-spring. Said spring is stretched between the arm 110 and the pawl 104 in such a manner that the line of direction along which the force acts upon the pawl 104 in the normal position (see Fig. 10) is between the axis 103 of the pawl and the ratchet wheel 1. The force, which the pressure spring 111 excercises upon the arm 110 applied in such a manner that the line of direction along which it acts all the time is beneath the axis O 109 of the arm, whereby this force tends to keep the arm pivoted down into the normal position illustrated in Fig. 10. The pivoting movement of the arm 110 is upwards limited by a stop dog 112.
When the blocking device is in the normal position illustrated in Fig. 10, the pawl 104 thus is kept in releasing position, as the force acting upon the pawl 104 attacks along a line of direction located above the axis 103 because of the fact that the pendulum 107 is in a rest position and conse~uently the arm in its lower end position. In case of an unnormal change of movement of the vehicle, where the blocking device according to the invention is ins-talled, 3 ~ the pendulum pivots into the position illustrated in Fig. 11J where-by the plate 106 pivots the arm 110, which bears against its top ~ _5_ ~1~3~3844 side, in upward direction round its axis 109 against the stop dog 112 at its upper end position. By the pressure spring 111 following the arm 110 in its pivoting movement, a change of direction of the force acting upon the pawl 104 is taking place, so that the line of direction of the force will be beneath the axis 103 of the pawl, which brings in its train that the pawl distinctly is pivoting over to the blocking position with its engaging end 104 engaging the teeth 2 of the ratchet wheel 1.
After the unnormal change of speed of the vehicle has ceased, and the pendulum 107 again occupied its rest position, in which the arm 110 by the bias of the spring 111 is pivo-ted down, the pawl 104 remains in its blocking position (see the position indicated by a continuous line in Fig.
-5a-` 1'~3~844 12). The spring force acting on the pawl 104 in spite of the downwards pivoting of the arm 110 is namely still directed with its line o~ direction located beneath the pivoting axis 103 of the pawl. As soon as the ratchet wheel 1 is turned in its dir-ection opposing the blocking direction, the nearest tooth 2 of the the ratchet wheel will bring the pawl 104 out of engagement, whereby the direction of` the spring force acting upon the pawl is changed, so that its line of direction is moved upwards above the axis 103 resulting in a distinct downwards pivoting movement of the pawl into its releasing position, which in the Fig. 12 is indica-ted with a dashed and dotted line.
In the embodiment which is illustrated in Fig. 13 -the required spring force is provided by means of a tension spring 113. In comparison with the described example above, the arm 110 in this embodiment is revorsed and the point of attachment 114 of the spring 113 on the pawl 10~ has been displaced to a point beyond the axis 103, whereby in principal a corresponding Eunction is obtained.
However, the forces between the arm 110 and the pawl 10~ are pulling forces, whereby their lines of direction relative to the axis 103 of the pawl will get an opposite location compared wi-th the example of embodiment with a pressure spring.
The invention is not limited to the examples of embodimen-t described above and illus-trated in the drawing, but can be varied within the scope of the following claims. By way o~ example one can imagine the actuation organ 107 to be of a di~erent type, in which connection also the arm may be of another design.
Claims (15)
1. Blocking device for vehicle reel-type safety belts comprising a rotatably mounted ratchet wheel having teeth and capable of being connected to the reels of the safety belts, a pivotally mounted blocking pawl positioned for at times engaging the teeth of said ratchet wheel for preventing rotation of said ratchet wheel in one direction, actuating means operable upon an abnormal change of speed of the vehicles, a pivotally mounted auxiliary pawl being positioned for being pivoted by said actuating means into engagement with said teeth and pivoting said blocking pawl into engagement with said teeth upon actuation of said actuating means, and resilient means tending to retain said auxiliary pawl into engagement with said actuating means.
2. Blocking device according to claim 1, wherein said auxiliary pawl is arranged to bring said blocking pawl into engagement with the teeth of said ratchet wheel at a given distance of said teeth from the engagement point therewith of said auxiliary pawl.
3. Blocking device according to claim 2, wherein said distance substantially corresponds to the tooth pitch of said ratchet wheel.
4. Blocking device according to claim 1, wherein a support of said pawls has a guiding surface and said auxiliary pawl is arranged to penetrate in between said blocking pawl and said guiding surface for pivoting said blocking pawl into engagement with said ratchet wheel.
5. Blocking device according to claim 1, including a pivotally mounted arm, said auxiliary pawl being pi-votally mounted on said arm, a support for said pawls, a spring being connected to said support and said arm, said arm being pi-votable against said blocking pawl against the bias of said spring and being arranged to bring said blocking pawl into engagement with said ratchet wheel.
6. A blocking device according to claim 5, wherein said blocking pawl has a projection, a second spring bears against said projection, said arm has a supporting edge against which said projection bears in the normal position of said block-ing pawl, and a recess into which said projection enters under the bias of said second spring, when said arm is pivoting against said blocking pawl.
7. Blocking device according to claim 1, wherein said actuation means is of an acceleration-sensing type.
8. Blocking device according to claim 7, wherein said actuation means comprises a pendulum, a plate rigidly connected with said pendulum, a foundation having said plate rest-ing thereon, and said auxiliary pawl is bearing on said plate.
9. Blocking device according to claim 8, wherein said actuation means comprises an upright pendulum extend-ing with a substantially circular curvature around the periphery of said ratchet wheel.
10. Blocking device according to claim 7, wherein said actuation means comprises a cup, a ball movable in said cup and a pivotable lever arm bearing against said ball and said auxiliary pawl.
11. Blocking device according to claim 1, wherein said actuation means comprises an electro-magnet, a lever arm operatively connected to said electro-magnet and positioned for bringing said auxiliary pawl into engagement with said teeth and said blocking pawl.
12. Blocking device according to claim 1, including a spring connected to said auxiliary pawl and an arm pivotable around an axis and connected with said spring, said arm being arranged to be pivoted by said actuation means.
13. Blocking device according to claim 12, wherein said spring is a pressure spring tending to counteract the change of position of said actuation means.
14. Blocking device according to claim 12, wherein said spring has the line of direction of the force of said spring being located outside of the pivotal axis of said arm as seen radially relative to said ratchet wheel.
15. Blocking device according to claim 14, wherein the teeth of said ratchet wheel are arranged to transfer the line of direction of force of said spring from one side of the axis of said auxiliary pawl to the other side of said axis during rotation of said ratchet wheel in a direction opposed to the blocking direction.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE7410929A SE400896B (en) | 1974-08-29 | 1974-08-29 | LOCKING DEVICE FOR ONE VEHICLE SET BELT BELT |
| SE7411283A SE401093B (en) | 1974-09-06 | 1974-09-06 | LOCKING DEVICE PREFERABLY FOR ROLLING BAR AT VEHICLE |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1038844A true CA1038844A (en) | 1978-09-19 |
Family
ID=26656519
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA233,840A Expired CA1038844A (en) | 1974-08-29 | 1975-08-19 | Blocking device preferably for reel-type safety belts for vehicles |
Country Status (8)
| Country | Link |
|---|---|
| JP (1) | JPS5150128A (en) |
| AU (1) | AU499751B2 (en) |
| BR (1) | BR7505526A (en) |
| CA (1) | CA1038844A (en) |
| DD (1) | DD120356A5 (en) |
| DE (1) | DE2537453A1 (en) |
| FR (1) | FR2282917A1 (en) |
| IT (1) | IT1042132B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4059242A (en) * | 1976-05-20 | 1977-11-22 | American Safety Equipment Corporation | Safety belt retractor |
| DE2826286C2 (en) * | 1978-06-15 | 1989-07-20 | Repa Feinstanzwerk Gmbh, 7071 Alfdorf | Seat belt retractor |
| DE2827409A1 (en) * | 1978-06-22 | 1980-01-10 | Klippan Nv | ADJUSTABLE SENSOR DEVICE APPROACHING VEHICLE ACCELERATION |
| DE4314348A1 (en) * | 1993-04-30 | 1994-11-03 | Trw Repa Gmbh | Ignition mechanism for a pyrotechnic gas generator |
| US5390874A (en) * | 1993-09-10 | 1995-02-21 | Trw Vehicle Safety Systems Inc. | Vehicle sensitive retractor |
| GB2556449B (en) * | 2017-10-16 | 2018-10-24 | William Hackett Lifting Products Ltd | Dual pawl having two pawl arms rotatable about a common axis |
-
1975
- 1975-08-08 AU AU83808/75A patent/AU499751B2/en not_active Expired
- 1975-08-19 CA CA233,840A patent/CA1038844A/en not_active Expired
- 1975-08-22 DE DE19752537453 patent/DE2537453A1/en not_active Withdrawn
- 1975-08-26 JP JP10337675A patent/JPS5150128A/en active Pending
- 1975-08-26 FR FR7526307A patent/FR2282917A1/en active Granted
- 1975-08-27 DD DD18805475A patent/DD120356A5/xx unknown
- 1975-08-28 IT IT2668575A patent/IT1042132B/en active
- 1975-08-28 BR BR7505526A patent/BR7505526A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| FR2282917B1 (en) | 1980-01-25 |
| IT1042132B (en) | 1980-01-30 |
| AU499751B2 (en) | 1979-05-03 |
| FR2282917A1 (en) | 1976-03-26 |
| JPS5150128A (en) | 1976-05-01 |
| DE2537453A1 (en) | 1976-03-11 |
| BR7505526A (en) | 1976-08-31 |
| DD120356A5 (en) | 1976-06-12 |
| AU8380875A (en) | 1977-02-10 |
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