CA1210707A - Vehicle brake - Google Patents
Vehicle brakeInfo
- Publication number
- CA1210707A CA1210707A CA000447365A CA447365A CA1210707A CA 1210707 A CA1210707 A CA 1210707A CA 000447365 A CA000447365 A CA 000447365A CA 447365 A CA447365 A CA 447365A CA 1210707 A CA1210707 A CA 1210707A
- Authority
- CA
- Canada
- Prior art keywords
- ground
- brake
- engaging
- legs
- truck
- 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
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T1/00—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles
- B60T1/12—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting otherwise than by retarding wheels, e.g. jet action
- B60T1/14—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting otherwise than by retarding wheels, e.g. jet action directly on road
Landscapes
- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Tires In General (AREA)
Abstract
VEHICLE BRAKE
Abstract A power-operated brake or sprag to prevent a truck or other vehicle from sliding backwards on a slip-pery incline is disclosed. Prior brakes have not been adequate to prevent heavily loaded trucks from sliding backwards on icy hills. The present brake features a frame design which allows the ground-engaging legs to be lowered from a point directly behind the rear wheels of the truck. This configuration causes the added load of the truck to be transmitted through the braking legs to increase their braking effect and offset the tendency of the increased load to slide. It also allows the use of shorter brake legs so that the legs do not extend beyond the truck chassis when raised.
Abstract A power-operated brake or sprag to prevent a truck or other vehicle from sliding backwards on a slip-pery incline is disclosed. Prior brakes have not been adequate to prevent heavily loaded trucks from sliding backwards on icy hills. The present brake features a frame design which allows the ground-engaging legs to be lowered from a point directly behind the rear wheels of the truck. This configuration causes the added load of the truck to be transmitted through the braking legs to increase their braking effect and offset the tendency of the increased load to slide. It also allows the use of shorter brake legs so that the legs do not extend beyond the truck chassis when raised.
Description
ll'7t)'7 VEIIICLE BRAKE
Background of the Invention _ield of the Invention This invention rela-tes to power-operated yround-engaging brakes or sprags to prevent a vehicle from sliding backwards on a slippery incline.
Description of the Prior Art Various devices have been utilized -~o prevent vehicles from backing down hills when such vehicles are stopped. Such a device as used on a wagon is shown in United States Patent No. 877,031 issued 21 January, 1908 to Ackerman. This vehicle brake comprised a pair of swinging bars connected to the rear axle of the wagon.
At the ends of the bars were bent, pointed elements which could be lowered to engage the ground and which would allow the wagon to move forward but would resist rearward motion. The bars were raised and lowered by the driver using a hand lever.
It has been known to raise and lower such ve-hicle brakes using compressed air cylinders, as shown in United States Patent No. 1,562,795 issued 24 November, 1925 to Sauveur and in Canadian Patent No. 1,104,072 issued 30 June, 1981 to Coulombe. The latter braking device was designed for use on slippery surfaces such as ice. It utilized two wedge-shaped ground engaging mem-bers which were lowered to a vertical position to engage the ground. As the vehicle moved backwards, the pointed end of the wedge-shape was driven positively into the ground and was restrained from rotating past the verti~
<''/ `~ r 121~
cal position by a cable.
Such prior vehicle brakes have not been found to provide sufficient safety and effec-ti~eness Eor ex-tremely heavily loaded ~ehicles on icy hill condi-tions and have not ~ound general accep-tance. The weight o~
the vehicle is found not to be trans~erred sufficiently to -the ground-engaging brake member to prevent such heavily loaded vehicles from rearward sliding.
Summary of the Invention The present inven-tion provides a vehicle brake suitable for preventing rearward sliding of heavily loaded trucks or other vehicles on slippery inclines.
The device is readily mounted as a single unit to the vehicle chassis. Due to the configuration of the devi-ce, the increase of the load on the vehicle i.9 directly transmitted to -the ground through the braXe and accord-inyly the positive engagement of the ground by the brake offsets the increased load.
The vehicle brake of the present in~en-tion comprises a frame secured to the chassis o~ the vehicle and having a member extending downwardly from the chas-sis thereof. Pivotally secured to the lower end of the downwardly extending member is a ground-engaging member with a ground-engaging element at the end thereof.
Power-actuated means such as a compressed air cylinder is pivotally secured at one end to the frame and is pi-votally secured at the other end to the ground-engaging member to raise and lower the ground-engaging member or members. In one embodiment, two independently rotatable ground-engaging members are utilized. The ground-3L2~(~7~7 engaging member may be pivotally secured to tlle down-wardly extending member at a point directly rearward of the rear axle of the vehicle.
In its preferred form, the frame member com-prises a cross-member secured at either end -to the vehi-cle chassls. The frame member may also comprise an ex tension to which the power-actuated means is pivotally attached. The power-actuated means may comprise a double action compressed air cylinder for both raising and lowering the ground-engaging member. The ground-engaging element adjacent the end of the ground-engaging member may consist of a metal plate or foo-t having a spike angled rearwardly attached thereto.
Brief Description of the Drawings The invention may be more clearly understood from the following detailed description and by reference to the drawings in which;
Figure 1 is a side view showing the vehicle brake of the present invention with the ground-engaging member extended and with the vehicle wheel and chassis in dotted outline;
Figure 2 is a side view of the frame element of the invention;
Figure 3 is a rear view of the frame element shown in Figure 2;
Figure 4 is a top view of the frame element shown in Figure 2.
Figure 5 is a rear view o~ the ground-engaging members shown in Figure 1: and Figure 6 is a side view of the ground-engaging member shown in Figure 5.
Detailed ~escription of an Embodiment of the Invention Referring to Figure 1, in dotted outline is shown a chassis of a heavy vehicle such as a truck, de-signated as 1. Typically the brake of the inventionwill be insta]led rearward of the dual rear wheels 2 o the -truck chassis. The truck chassis will generally in-clude a frame 3 having a cross-member 4 shown as a dot-ted line. ~le truck trailer is not shown. When the truck is stopped on an incline, and the ground 5 has a slippery surace such as ice, the tendency will be for the truck to slide in direction A. The brake of the present invention is installed to prevent such sliding.
The brake consists of a frame element general-ly designated as 6, ground-engaging legs 13, compressed air cylinders 16 and a retaining cable or chain 15. As shown in a rear view in Eigure 3 and in a top view in Figure 4, the frame element consists o a cross-member 8, extensions for anchoring the cylinders 9, and down-wardly extending members 11. The cross-member 8 is pre-ferably secured to the truck chassis 3 at 20 using bolts or o~her means. As shown in Figure 2, the fra~e member has an extension 22 which abu-ts against the cross-member 4 of the truck chassis for a stronger connection. Ex-tension 22 may be bolted or welded to cross-member 4.
Extensions 9 are provided with holes 24 to receive the air cylinders. The frame may also have welded thereto a skirt 12 to add additional strength and rigidity. The lower end of element 11 is provided with holes 2~ for 0 receiving the axle for the ground-engaging legs.
The gro~nd-engaging leys shown in Figure 5 ro-tate on an axle sha~t 21 which is designed to be secured to holes 26 in the Erame member. In the preferred embo-diment, there are two ground~engaging legs 13 which pi-vot independently on shaft 21. Welded -to legs 13 are sleeves 22 w~ich rotate on axle shaft 21, and to which are secured cross-braces 14. The -two legs may rota-te indepe~dently, to allow for differences in the under-lying terrain, or the sleeves 22 may be joined to form a continuous unit. Welded to the upper surface of the legs is a tab 25 having a hole to which the arm of -the power cylinder may be pivotally attached. In the pre-ferred form, the ends of the ground-engaging legs have feet 26 welded thereto to form angle B as shown in Fig-lS ure 1. Angle B is chosen so that the feet will be pa-rallel to the ground when the gro~nd-engaging legs are lowered into contact with the ground. The feet 26 may be formed using a metal plate havi~g a surface which is raised rearward:Ly to facilitate the entry of the spike element into the ground when the vehicle is sliding backwards. Welded to the feet 26 are spike elements 17 which are generally parallel to the legs 13. The spikes are preferably constructed of a steel of medium hardness which is not brittle.
When not in use, the compressed air c-ylinder is retracted and the brake remains hidden under the truck frame to the rear of the wheels. When the truck is climbing or stopped on an icy slope, the power cylin-der is extended to lower the ground-engaging legs into contact with the icy surfaceO A chain or cable 15 may ~z~
be used to res-trict -the ex-tension of the leqs. Refer-r,ing to Figure 1, due to angle B which t'he spike ele-ment 17 and the legs 13 form with the ground, the down-ward vector C indicating the downward welght of the load comblnes with the rearward vector A so that the effec tive force of the load is directed along the ground-engaging legs in direction D. The greater the load on the truck, the greater the force directed along the brake legs and the greater the braking force applied to the ground.
Generally the majority of the weight of the truck is directed over the rear wheels of the tractor when the trailer is in place, the weight is most effec-tively conveyed directly along the ground-engaging legs in the present invention. By locating the pivot point for the legs of the brake directly behind and in the same vertical plane as the rear axle, the force vector of the weight i5 most effectively directed along the ex-tended around-engaging legs of the brake. In addition, the length of the legs is reduced due to the downward extension of the brake frame. This avoids having the raised legs extend beyond the end of the truck chassis.
As will be apparent to those skilled in the art in light of the foregoing disclosure, many altera-tions and modifi,cations are possible in the practice ofthis invention without departing from the spirit or scope thereof. Accordingly, the scope of the invention i8 to be construed in accordance with the substance de-fined by the following claims.
Background of the Invention _ield of the Invention This invention rela-tes to power-operated yround-engaging brakes or sprags to prevent a vehicle from sliding backwards on a slippery incline.
Description of the Prior Art Various devices have been utilized -~o prevent vehicles from backing down hills when such vehicles are stopped. Such a device as used on a wagon is shown in United States Patent No. 877,031 issued 21 January, 1908 to Ackerman. This vehicle brake comprised a pair of swinging bars connected to the rear axle of the wagon.
At the ends of the bars were bent, pointed elements which could be lowered to engage the ground and which would allow the wagon to move forward but would resist rearward motion. The bars were raised and lowered by the driver using a hand lever.
It has been known to raise and lower such ve-hicle brakes using compressed air cylinders, as shown in United States Patent No. 1,562,795 issued 24 November, 1925 to Sauveur and in Canadian Patent No. 1,104,072 issued 30 June, 1981 to Coulombe. The latter braking device was designed for use on slippery surfaces such as ice. It utilized two wedge-shaped ground engaging mem-bers which were lowered to a vertical position to engage the ground. As the vehicle moved backwards, the pointed end of the wedge-shape was driven positively into the ground and was restrained from rotating past the verti~
<''/ `~ r 121~
cal position by a cable.
Such prior vehicle brakes have not been found to provide sufficient safety and effec-ti~eness Eor ex-tremely heavily loaded ~ehicles on icy hill condi-tions and have not ~ound general accep-tance. The weight o~
the vehicle is found not to be trans~erred sufficiently to -the ground-engaging brake member to prevent such heavily loaded vehicles from rearward sliding.
Summary of the Invention The present inven-tion provides a vehicle brake suitable for preventing rearward sliding of heavily loaded trucks or other vehicles on slippery inclines.
The device is readily mounted as a single unit to the vehicle chassis. Due to the configuration of the devi-ce, the increase of the load on the vehicle i.9 directly transmitted to -the ground through the braXe and accord-inyly the positive engagement of the ground by the brake offsets the increased load.
The vehicle brake of the present in~en-tion comprises a frame secured to the chassis o~ the vehicle and having a member extending downwardly from the chas-sis thereof. Pivotally secured to the lower end of the downwardly extending member is a ground-engaging member with a ground-engaging element at the end thereof.
Power-actuated means such as a compressed air cylinder is pivotally secured at one end to the frame and is pi-votally secured at the other end to the ground-engaging member to raise and lower the ground-engaging member or members. In one embodiment, two independently rotatable ground-engaging members are utilized. The ground-3L2~(~7~7 engaging member may be pivotally secured to tlle down-wardly extending member at a point directly rearward of the rear axle of the vehicle.
In its preferred form, the frame member com-prises a cross-member secured at either end -to the vehi-cle chassls. The frame member may also comprise an ex tension to which the power-actuated means is pivotally attached. The power-actuated means may comprise a double action compressed air cylinder for both raising and lowering the ground-engaging member. The ground-engaging element adjacent the end of the ground-engaging member may consist of a metal plate or foo-t having a spike angled rearwardly attached thereto.
Brief Description of the Drawings The invention may be more clearly understood from the following detailed description and by reference to the drawings in which;
Figure 1 is a side view showing the vehicle brake of the present invention with the ground-engaging member extended and with the vehicle wheel and chassis in dotted outline;
Figure 2 is a side view of the frame element of the invention;
Figure 3 is a rear view of the frame element shown in Figure 2;
Figure 4 is a top view of the frame element shown in Figure 2.
Figure 5 is a rear view o~ the ground-engaging members shown in Figure 1: and Figure 6 is a side view of the ground-engaging member shown in Figure 5.
Detailed ~escription of an Embodiment of the Invention Referring to Figure 1, in dotted outline is shown a chassis of a heavy vehicle such as a truck, de-signated as 1. Typically the brake of the inventionwill be insta]led rearward of the dual rear wheels 2 o the -truck chassis. The truck chassis will generally in-clude a frame 3 having a cross-member 4 shown as a dot-ted line. ~le truck trailer is not shown. When the truck is stopped on an incline, and the ground 5 has a slippery surace such as ice, the tendency will be for the truck to slide in direction A. The brake of the present invention is installed to prevent such sliding.
The brake consists of a frame element general-ly designated as 6, ground-engaging legs 13, compressed air cylinders 16 and a retaining cable or chain 15. As shown in a rear view in Eigure 3 and in a top view in Figure 4, the frame element consists o a cross-member 8, extensions for anchoring the cylinders 9, and down-wardly extending members 11. The cross-member 8 is pre-ferably secured to the truck chassis 3 at 20 using bolts or o~her means. As shown in Figure 2, the fra~e member has an extension 22 which abu-ts against the cross-member 4 of the truck chassis for a stronger connection. Ex-tension 22 may be bolted or welded to cross-member 4.
Extensions 9 are provided with holes 24 to receive the air cylinders. The frame may also have welded thereto a skirt 12 to add additional strength and rigidity. The lower end of element 11 is provided with holes 2~ for 0 receiving the axle for the ground-engaging legs.
The gro~nd-engaging leys shown in Figure 5 ro-tate on an axle sha~t 21 which is designed to be secured to holes 26 in the Erame member. In the preferred embo-diment, there are two ground~engaging legs 13 which pi-vot independently on shaft 21. Welded -to legs 13 are sleeves 22 w~ich rotate on axle shaft 21, and to which are secured cross-braces 14. The -two legs may rota-te indepe~dently, to allow for differences in the under-lying terrain, or the sleeves 22 may be joined to form a continuous unit. Welded to the upper surface of the legs is a tab 25 having a hole to which the arm of -the power cylinder may be pivotally attached. In the pre-ferred form, the ends of the ground-engaging legs have feet 26 welded thereto to form angle B as shown in Fig-lS ure 1. Angle B is chosen so that the feet will be pa-rallel to the ground when the gro~nd-engaging legs are lowered into contact with the ground. The feet 26 may be formed using a metal plate havi~g a surface which is raised rearward:Ly to facilitate the entry of the spike element into the ground when the vehicle is sliding backwards. Welded to the feet 26 are spike elements 17 which are generally parallel to the legs 13. The spikes are preferably constructed of a steel of medium hardness which is not brittle.
When not in use, the compressed air c-ylinder is retracted and the brake remains hidden under the truck frame to the rear of the wheels. When the truck is climbing or stopped on an icy slope, the power cylin-der is extended to lower the ground-engaging legs into contact with the icy surfaceO A chain or cable 15 may ~z~
be used to res-trict -the ex-tension of the leqs. Refer-r,ing to Figure 1, due to angle B which t'he spike ele-ment 17 and the legs 13 form with the ground, the down-ward vector C indicating the downward welght of the load comblnes with the rearward vector A so that the effec tive force of the load is directed along the ground-engaging legs in direction D. The greater the load on the truck, the greater the force directed along the brake legs and the greater the braking force applied to the ground.
Generally the majority of the weight of the truck is directed over the rear wheels of the tractor when the trailer is in place, the weight is most effec-tively conveyed directly along the ground-engaging legs in the present invention. By locating the pivot point for the legs of the brake directly behind and in the same vertical plane as the rear axle, the force vector of the weight i5 most effectively directed along the ex-tended around-engaging legs of the brake. In addition, the length of the legs is reduced due to the downward extension of the brake frame. This avoids having the raised legs extend beyond the end of the truck chassis.
As will be apparent to those skilled in the art in light of the foregoing disclosure, many altera-tions and modifi,cations are possible in the practice ofthis invention without departing from the spirit or scope thereof. Accordingly, the scope of the invention i8 to be construed in accordance with the substance de-fined by the following claims.
Claims (5)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS
FOLLOWS:
1. A brake for preventing rearward motion of a vehicle comprising:
(1) A frame secured to the chassis of said vehicle and having a downwardly extending member;
(2) A ground-engaging member having a ground-engaging element adjacent one end, and a second end pivotally secured to said downwardly extending member, and, (3) Power-actuated means for raising and lowering said ground-engaging member, wherein said frame and said ground-engaging member each comprise means for pivotally receiving said power-actuated means.
(1) A frame secured to the chassis of said vehicle and having a downwardly extending member;
(2) A ground-engaging member having a ground-engaging element adjacent one end, and a second end pivotally secured to said downwardly extending member, and, (3) Power-actuated means for raising and lowering said ground-engaging member, wherein said frame and said ground-engaging member each comprise means for pivotally receiving said power-actuated means.
2. The brake of claim 1 wherein said ground-engaging element comprises a spike.
3. The brake of claim 1 comprising two indepen-dently rotatable ground-engaging members.
4. The brake of claim 1 wherein said ground-engaging member is pivotally secured to said downwardly extending member at a point directly rearward of the rear axle of said vehicle.
5. The brake of claim 4 wherein said ground-engaging element in the lowered position forms an angle from the vertical between 15 and 60 degrees.
- Page 1 of Claims -
- Page 1 of Claims -
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000447365A CA1210707A (en) | 1984-02-14 | 1984-02-14 | Vehicle brake |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000447365A CA1210707A (en) | 1984-02-14 | 1984-02-14 | Vehicle brake |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1210707A true CA1210707A (en) | 1986-09-02 |
Family
ID=4127181
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000447365A Expired CA1210707A (en) | 1984-02-14 | 1984-02-14 | Vehicle brake |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1210707A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1994003350A1 (en) * | 1992-08-08 | 1994-02-17 | Joo Hee Lee | Auxiliary brake system for automobile |
| AT408212B (en) * | 1999-02-19 | 2001-09-25 | Erlinger Josef | Emergency brake device for vehicles at risk of skidding, in particular buses |
| CN115384461A (en) * | 2022-08-23 | 2022-11-25 | 江西五十铃汽车有限公司 | Automatic braking method and system for commercial vehicle and commercial vehicle |
-
1984
- 1984-02-14 CA CA000447365A patent/CA1210707A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1994003350A1 (en) * | 1992-08-08 | 1994-02-17 | Joo Hee Lee | Auxiliary brake system for automobile |
| AT408212B (en) * | 1999-02-19 | 2001-09-25 | Erlinger Josef | Emergency brake device for vehicles at risk of skidding, in particular buses |
| CN115384461A (en) * | 2022-08-23 | 2022-11-25 | 江西五十铃汽车有限公司 | Automatic braking method and system for commercial vehicle and commercial vehicle |
| CN115384461B (en) * | 2022-08-23 | 2024-03-01 | 江西五十铃汽车有限公司 | Automatic braking method and system for commercial vehicle and commercial vehicle |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |