MXPA98001842A - Tower signal tester for cam - Google Patents
Tower signal tester for camInfo
- Publication number
- MXPA98001842A MXPA98001842A MXPA/A/1998/001842A MX9801842A MXPA98001842A MX PA98001842 A MXPA98001842 A MX PA98001842A MX 9801842 A MX9801842 A MX 9801842A MX PA98001842 A MXPA98001842 A MX PA98001842A
- Authority
- MX
- Mexico
- Prior art keywords
- trailer
- housing
- trailers
- subcircuit
- signal tester
- Prior art date
Links
- 230000011664 signaling Effects 0.000 claims abstract description 25
- 230000000875 corresponding Effects 0.000 claims abstract description 18
- 239000004020 conductor Substances 0.000 claims description 26
- 230000001681 protective Effects 0.000 claims description 7
- 230000004913 activation Effects 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims description 4
- 238000005286 illumination Methods 0.000 claims description 4
- 241000283086 Equidae Species 0.000 claims 1
- 238000004642 transportation engineering Methods 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 101700050571 SUOX Proteins 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000001419 dependent Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000003550 marker Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Abstract
A portable diagnostic device for checking electrical trailer marking systems, the device has several receptacles for connection to a corresponding receptacle or pin connective of most types of trailers (20,22,39,90,92); electrical includes switches to activate individual signaling and lighting circuits of the trailer individually, and indicator lamps to indicate the operation ability of the circuit, the device, which is contained in a wheeled car, has its own power supply (34) and Circuit overcurrent protection devices and in this way and independent of a tractor that normally generates the signals, pumps are provided to generate pneumatic and hydraulic pressure to control the integrity of these systems of a trailer, you can also control auxiliary electrical systems, such as electric brakes, the device allows a workshop To perform a safety check for many varieties of trailers, at the same time remaining independent of the tractor vehicles associated with trailers
Description
* TRAILER SIGNAL TESTER FOR TRUCK
BACKGROUND OF THE INVENTION 5 1. FIELD OF THE INVENTION
The present invention relates to a tester and indicator device for verifying the operation of the signaling system of a truck trailer. The device is contained within a vehicle with small wheels, and allows independent control of certain electrical and mechanical systems of a tractor being attached to the trailer. The vehicle is maneuvered, connected and operated manually by a person.
2. DESCRIPTION OF THE PREVIOUS TECHNIQUE
Trailed cargo trailers pulled over tractors are equipped with many signaling and safety features. Illuminated signal lamps include brake lights 20, turn signals, running lights. Safety features may include redundant pneumatic brake systems, and an electric brake system. Trailers must be periodically inspected for the operational ability of these signaling and safety systems.
* One way to test and observe is to connect a tractor to the trailer. A tractor has voltage and pneumatic sources to operate the systems. An observer can activate the different systems individually, then observe the results. 5 This method can be quite inefficient, since it depends on the presence of an unused tractor, and it also requires time to make connections and carry out the difficult to operate procedure to manually activate each system, then walk around the trailer to verify the own operation. 10 A tractor may not be available for such work when it would be convenient to perform the safety check. A smaller and less expensive device to replace the tractor would serve well as a replacement, and a number of such devices are proposed in the prior art. 15 The patent of E.U.A. No. 3,663,939, issued to Hans Olsson ^ the
May 16, 1972, describes a device that can be inserted in series in the combined wiring of a tractor and its trailer. This device requires the presence of a tractor, and does not cooperate with pneumatic or hydraulic systems. 20 A small diagnostic device that plugs directly into an integral plug with a trailer is shown in the U.S. patent. No. 3,737,767, issued to Robert Slutsky on June 5, 1973. This device can be used only with vehicles that have a seven-pin plug. The device can not
testing the marker lights independently of the rear lights *, you can not promptly control a four-way intermittent function. The patent of E. U.A. No. 4, 547, 722, issued to Thomas J. Sarlo on October 15, 1985, describes a diagnostic device
mounted on a trolley with wheels. This device is also limited to testing vehicles that have the particular type of receptacle provided. A diagnostic device for testing brake systems is set forth in the U.S.A. patent. No. 4, 70, 354, issued to Anton
Knestel on June 14, 1988. This device requires rollers that make contact with the wheels of the vehicle. Rollers and wheel control are not involved in the present invention. A circuit for diagnosing the operating ability of an electric towing system is shown in the patent of E. U.A. No. 5, 095, 2.76, issued to James C. Nepil on March 10, 1992. This circuit is considerably more complicated than that of the present invention, although it does not provide the versatility of the present invention. The prior art devices should be used particularly with trailers for the tractor and trailer combinations, and have electrical interconnecting components found specifically in such combinations. They lack the ability to be compatible with a variety of similar electrical interconnecting receptacles and components. Also, the 25 prior art devices having electrical diagnostic circuits have no provision for testing pneumatic brake systems and auxiliary electrical systems. None of the above inventions and patents, taken separately or in combination, seems to describe the present invention as claimed.
BRIEF DESCRIPTION OF THE INVENTION
The present invention provides a small apparatus with wheels
that can be maneuvered that an individual technician can connect to a cargo trailer for the purpose of analyzing or controlling the trailer's signaling systems. Most of these systems are electrical, and operate specific lamps. Other optional systems control pneumatic and hydraulic systems. He
The apparatus generates electrical signals to operate the different lamps on the trailer The indicators provided on the apparatus indicate the continuity of the different circuits, thus confirming the operational ability of the trailer lamps. trailer are
controlled by pressurizing the respective system, and audibly and visually examining the trailer. This examination will detect leaks and failures to operate in the proper manner. * The novel signal testing device should be
specifically compatible with most cargo trailers, mobile homes, reaction trailers, horse trailers, and some smaller trailers, all of which have modular cable connectors to extend an electrical signaling system from the tractor. These cable connectors are provided in a variety of pin dimensions and configurations, most of them are standardized and widely adapted. To this end, the novel device is provided with a plurality of corresponding modular cable connections that couple with corresponding connectors conventionally provided in different sizes of trailers. An energy supply is provided so that the device and the test procedure are independent of a tractor. Overcurrent devices provide protection to the circuit. Intermittent switches are provided to help identify the operation of the lights that normally flash when operating, such as turn signals and the four-way flasher. In addition, the test device has electrical power circuits to test electric brakes, air pressure to test the integrity of pneumatic brake systems, and hydraulic pressure to test hydraulic servo-lift systems. In this way, a service shop that has the novel test device will be able to perform safety checks on most types of trailers brought to service, and will not depend on the corresponding tractors or vehicles and electrical connectors specifically associated with them. these trailers. Accordingly, a main object of the invention is to provide a mobile trailer signal tester, which can be used by a single person to perform safety checks on trailers.
Another object of the invention is to provide a tow signal tester that is readily compatible with different types of trailers. Another object of the invention is to generate electrical signals, transmit electrical signals to lighting circuits and signal a trailer, and use electrical signals to illuminate indicator lamps. Another object of the invention is to generate pressure signals and transmit the pressure signals to pneumatic and hydraulic systems of a trailer, in order to observe the operating ability of these systems. Still another object of the invention is to generate electrical power signals to operate devices activated in a trailer.
Another object of the invention is to protect the electrical circuit of an overcurrent condition. Another object of the invention is to incorporate intermittent switches in circuits to test turn signals and four-way flashing lights. An object of the invention is to provide improved elements and arrangements thereof in an apparatus for the described purposes that is inexpensive, dependent and fully effective to achieve its intended purposes. These and other objects of the present invention will be apparent from a review of the specification and drawings below. 5 BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a side elevational, environmental view of the invention connected to a trailer. Figure 2 is an electrical schematic drawing of the circuit of the invention. Figure 3 is a side elevation view of the invention, drawn on a large scale. Similar reference characters denote corresponding characteristics consistently in the accompanying drawings. ^
DETAILED DESCRIPTION OF THE PREFERRED MODALITIES
The novel trailer signal tester 10 is seen in Figure 1 connected to a trailer 12. The tester 10 comprises a carriage having a housing 14 enclosing electrical circuits, wheels 16 supporting the carriage, and a handle 18 for maneuvering the car. This compact device allows the tester 10 to be maneuvered in place, connected, and operated by a person.
The tester 10 includes different modular cable connectors 20,22 for receiving wires 24 which are conventionally used to drive electrical lighting signals from a tow tractor (not shown) to the trailer 12. The 5 wire connectors 20,22 are selected to from a number of normal varieties used extensively in the transportation industry. Different or non-similar connectors are provided so that the tester 10 can be connected quickly to many of the different types of trailers in current use. A pneumatic pressure hose 25 also extends to the trailer 12, the purpose of which will be explained below. The electrical connection allows testing certain conventional circuits, including those operating taillights 26, marking lights 28, brake lights or stop 30, and return signals. In this
In the aspect, both the right and left fl ight signals are represented by the signal light 32. The lamps indicating alarm, popularly known as four-way intermittent switches, operate right and left signals simultaneously. 20 Once connected in the illustrated manner, individual circuits and systems are operated, and the results are noted. The tester 10 makes the towing vehicle unnecessary to generate electrical and operating pressure signals. Each type of connector 20 or 22 essentially duplicates those
found in a trailer. A connector has terminals (see figure SA 2) for a plurality of individual conductors each connected to a selected or predetermined illumination circuit or signal of the trailer. In this way, each conductor of a given cable connector corresponds to a predetermined function or lighting circuit or signaling. When connected, the activation of a selected tow circuit will also activate a selected subcircuit inside the tester 10. The standardization of connectors and even the
«Correlation of location of individual terminals with respect to
which function or lighting circuit is activated, thus allowing quick connection and testing. The electrical circuits and components thereof that are discarded in or within a housing 14 are shown in Figure 2. The electrical circuit includes a power supply, such
as the battery 34, various subcircuits for testing individual illumination and signaling • functions, and three modular cable connectors 20, 22, 36. A subcircuit is provided for each function that. is going to try. This arrangement is well known in the prior art, and the
subcircuit components to test each function will not be described respectively. Subcircuits are provided to verify the main lighting and signaling functions set forth above, and a specialized subcircuit to provide power for miscellaneous or non-specific purposes.
A typical signaling and illumination circuit is shown to the left of Figure 2, and includes an indicator lamp 38, a counter-circuit 40, a two-position switch 42, and conductors 44 that connect these components to the rest of the circuit. Visual indicators are preferred, although if desired, the indicator may be audible. The overcurrent protective device is preferably a circuit breaker, since these can be reset quickly, but it can also be a fuse or ribbon fuse, if desired. Any arrangement number of overcurrent protective devices is possible in the direction of the practitioner of the invention, the particular arrangement shown in this figure being judged sufficient to protect all drivers. The switch 42 closes and opens the cylinder, thereby selectively controlling its respective subcircuit. The lamp 38 responds to the successful activation of the circuit, and, when the switch 42 closes the circuit, it will illuminate if the corresponding traffic circle of the trailer is intact. If the circuit is defective, lamp 38 will remain off. All other circuit breakers include respective lamps, circuit breakers, switches, and conditioners that make the connection to power and extend the subcircuit to the appropriate terminal of the appropriate cable connector 20, 22, or 36. It will be appreciated that certain functions Signals and lighting must be present in all vehicles, and in this way, certain functions are connected in parallel between cable connectors 20, 22, 36. For example, all vehicles must have turn signals and lights of running or marking, and the appropriate terminals are connected in common. Typically, a six-wire cable connector 20 is used with mobile homes, recreational trailers, and horse trailers. Typically, seven-wire cable connectors 22 are provided in large cargo trailers. The
* Electrical systems of these vehicles typically have
positive leads, indicated on terminals 46, which are connected in common. A corresponding driver is not usually provided for small trailers, of the type normally driven by a passenger car. Therefore, a corresponding terminal 15 is not provided in the cable connector 36. In this manner, those terminals serving similar purposes are connected in common in all cable connectors. This arrangement confers ability of immediate operation to the tester 10 by being plugged into the trailer's electrical system. 20 Obviously, electrical systems that have more functions can not be fully wired in common with those that do not have certain functions. The subcircuit defined by switch 48, counter-circuit 50, lamps 52 and 54, and solenoids 56 and 58 selectively provides
continuity to battery sites 34 positive and negative. This allows you to frequently find energy as appropriate, and thus proven. This feature can be used to test such devices as electric brakes or winches. 5 Switch 48 is a three position switch where one terminal is connected alternately and individually to the other two terminals. In this circuit, the terminal 60 is in electrical communication with any terminal 62 or terminal 64. The solenoids 56, 58 are relays that operate in a manner similar to solenoids of the motor run used frequently, and are intentionally illustrated to represent said relays . The electrical circuit includes intermittent switches 66, 68, 70 for operating flashing lights, such as turn signals and simultaneous four-light alarm lights, so
conventional. Intermittent switches 66, 68, 70 are provided employing, for twelve-volt systems, model numbers 262, 263, and 552 of the Signal-Stat division of the Federal Mogul Corporation of Detroit, Michigan. These intermittent or equivalent switches transmit an intermittent energy signal to subcircuits
, so that the lights can be identified quickly due to their characteristic flash. A four-way intermittent switch 70 is connected to operate both right and left turn signals simultaneously, in accordance with the practice of the normal transportation industry.
Of course, testing of these circuits can proceed without intermittent switches, if desired. The remaining subcircuits 72, 74, 76, 78 are identified in the scheme of Figure 2 by their respective indicator lamps, but will be understood to include respective two-position switches and associated leads that operably connect these switches to corresponding power and terminals in cable connectors 20, 22, 36. Obviously, each subcircuit completes a circuit to a type of signaling and lighting function in the trailer. Cable connectors 20, 22, 36 are preferred since they correspond to cable connections found most frequently in the transportation industry. The connector 20, which has seven conductors disposed as shown, wherein the upper terminal 80 corresponds to an upper electrode of a tractor and trailer wiring system (not shown), is used in combinations of tractor and trailer-towing cargo big. The connector 20, the upper terminal 82 corresponding also to the upper terminal of its trailer counterpart (not shown) is typical of mobile home wiring systems, recreational trailers, and cavalry trailers. Connector 36 is typical of connections for smaller trailers pulled by passenger car. For larger trailers, additional testing features are provided. Referring now to Figure 3, three features are illustrated as such. An air compressor 84 driven by an engine 86, and controlled from an externally accessible switch 88, supplies compressed air to the hose 25 ending in a manual connection 92, for connection to a pneumatic system 5 (not shown) of a trailer. The integrity of the pneumatic system can be ensured by audible leak detection, by observation to determine if the system maintains pneumatic pressure, and by operational tests, if desired. Alternatively, a tank can be incorporated (not shown)
as a supply of compressed gas. In another alternative, pneumatic conduits can be provided including a rapidly connected coupler (not shown), for connection to a separate air compressor. Valves can be provided with any alternative to provide control over the activation of the pneumatic system of the
trailer. fc Some pneumatic trailer systems operate under vacuum. These can be tested by a vacuum pump 94 driven by a motor 96, and controlled from an external switch 98. A vacuum hose 100 and appropriate accessory 102 allow
connection to the trailer vacuum system (not shown). It would also be possible to arrange an air compressor 84 to supply vacuum by appropriate reconnection, if desired. A hydraulic test system is provided which includes a reservoir 104 for supplying hydraulic fluid, an external hydraulic pump 1 10, and a hydraulic hose 112 that terminates in a hydraulic attachment 114. As seen in this figure, the S-switches, C, and indicator lamps L shown in scheme 5 of figure 2, are preferably mounted outside the housing 14, in order to be visible and accessible. The tester 10 has a suitable power supply, which may comprise battery 34, and also, if desired, may include a suitable cord and plug 1 16 and AC-to-DC converter
1 18. Despite the DC power supply, the power circuit represented generally at 120 extends to the motors 86, 96, 108 to operate them. The novel tester 10 in this manner allows safety checks of a trailer in the absence of the traction vehicle.
It can be driven by one person, and can be used to perform checks on different types of trailers that have pneumatic, hydraulic and electrical auxiliary systems. The electrical and pressure systems are readily compatible with those of the trailers. It should be understood that the present invention is not limited to the modalities described above, but encompasses any and all modalities within the scope of the following claims.
Claims (9)
1. - A towing signal tester for carrying out safety checks having illumination circuits and 5 signaling, comprising: electrical circuit that can be connected and which corresponds to and activates and selectively indicates lighting and signaling circuits of the trailer, also comprises a electric power supply and subcircuits serving a lighting circuit 10 and selected signaling, each said subcircuit has a switch to selectively control its respective subcircuit, and an indicator that responds to the successful activation of each said subcircuit; and a plurality of dissimilar modular cable connectors 15 have a plurality of conductors, each individual conductor corresponds to a lighting and signaling function of the trailer, individual conductors for each lighting function and similar signaling of each said modular cable connector. being connected in parallel by said electrical circuit to said predetermined subcircuit, wherein similar functions are activated and tested on trailers having different modular cable connectors by said designated subcircuit.
2. The trailer signal tester according to claim 1, wherein it comprises a carriage having a 25 housing enclosing said electrical circuit, wheels supporting said carriage, and a handle to maneuver said carriage and fixed thereto.
3. The trailer signal tester according to claim 2, wherein said indicators comprise lamps mounted on and visible from said housing.
4. The trailer signal tester according to claim 2, wherein said subcircuit further comprises an overcurrent protective device operably connected thereto.
5. The trailer signal tester according to claim 2, wherein said electric circuit further comprises at least one intermittent switch operably connected to at least said subcircuit connected to a conductor corresponding to a signal circuit. of the trailer, to transmit an intermittent energy signal to said corresponding circuit of said tow signal tester.
6. The trailer signal tester according to claim 2, wherein it further comprises a four-way indicator operably connected to said subcircuit connected to a conductor that corresponds to both signal circuits of the trailer return, to transmit an intermittent energy signal to said corresponding sub-circuits of said tow signal tester. 7 '.- The tow signal tester according to claim 2, wherein said plurality of modular cable connectors * includes a six-conductor modular cable connector and a seven-conductor modular cable connector, wherein said tester trailer signal is compatible with cargo trailers, mobile homes, recreational trailers and trailers for 5 horses. 8. The trailer signal tester according to claim 7, wherein said plurality of modular cable connectors further comprises a four-conductor modular cable connector, wherein said trailer signal tester 10 also compatible with small trailers. 9. The trailer signal tester according to claim 2, wherein it further comprises: a supply of compressed gas; and at least one pneumatic hose connected to said 15 supply of compressed gas, which extends from said housing, and terminates in a manual connection, wherein a pneumatic system of a trailer can be connected to and pressurized from said towing signal tester. 10. The towing signal tester according to claim 2, wherein it further comprises: a hydraulic pump and an associated motor enclosed within said housing, said motor connected to said power supply through a pump switch hydraulics; an hydraulic fluid container communicating with said hydraulic pump; and * a hydraulic hose connected to said hydraulic pump, which extends from said housing, ends in a hydraulic fitting, wherein a hydraulic system of a trailer can be connected to and subjected to pressure from said signal tester 5 of tow. 11. The trailer signal tester according to claim 2, wherein it further comprises: * a vacuum pump and associated motor enclosed within said housing, said motor connected to said power supply through a vacuum pump switch; and a vacuum hose connected to said vacuum pump, which extends from said housing, and ends in a pneumatic accessory, wherein a vacuum brake system of a trailer can be connected to and not subjected to pressure from said tester 15 of trailer serial. 12. A trailer signal tester for performing safety checks on trailers that have lighting and signaling circuits, comprising; a carriage having a housing, wheels that support said carriage, and a handle for maneuvering said carriage and fixed thereto, electrical circuit enclosed within said housing, and that can be connected and corresponding to and that selectively activates and indicates circuits of lighting and signage of the trailer, also includes a supply of electrical power and subcircuits 25 serving a lighting and signaling circuit, each said subcircuit has a switch to selectively control its respective subcircuit, an overcurrent protective device, and an indicator lamp that responds to successful activation of each said subcircuit, each said switch, said protective device 5 overcurrent, and said indicator lamp mounted on and accessible from outside said housing; and a six-conductor modular cable connector and a * seven conductor modular cable connector, where said tow signal tester is compatible with trailers of 10 cargo, mobile homes, recreational trailers and horse trailers, each said modular cable connector has a plurality of conductors, each individual conductor corresponds to a lighting and signaling function of the trailer, individual conductors for each lighting function and similar signaling 15 of each modular cable connector being connected in parallel fc by said electric circuit to said predetermined subcircuit, wherein similar functions are activated and tested on trailers having different modular cable connectors by said designated subcircuit. 13. The trailer signal tester according to claim 12, wherein said electric circuit further comprises at least one intermittent switch operably connected to at least one said subcircuit connected to a conductor corresponding to a circuit. of return signal from 25 trailer, for transmitting an intermittent energy signal to said corresponding subcircuit of said tow signal tester, and a four-way indicator operably connected to said subcircuit connected to a conductor corresponding to both return signal circuits. of the trailer, for transmitting an intermittent energy signal to said corresponding sub-circuits of said tow signal tester. 14. The trailer signal tester according to claim,, wherein said modular cable connectors further comprise a modular cable connector of four. 10 conductors, wherein said tow signal tester is also compatible with small trailers. 15. The trailer signal tester according to claim 12, wherein it further comprises: an air compressor and an associated motor enclosed within said housing, said motor connected to said power supply through a compressor switch of air; and at least one pneumatic hose connected to said air compressor, extending from said housing, and ending in a manual connection, wherein a pneumatic system of A trailer can be connected to and subjected to pressure from said towing signal tester. 16. The towing signal tester according to claim 12, wherein it further comprises: a hydraulic pump and an associated motor enclosed within said housing, said motor connected to said power supply through a pump switch hydraulics; a container of hydraulic fluid communicating with said hydraulic pump; and a hydraulic hose connected to said hydraulic pump, which extends from said housing, ends in a hydraulic fitting, wherein a hydraulic system of a trailer can be connected to and subjected to pressure from said towing signal tester. 1
7. The tow signal tester according to claim 12, wherein it further comprises: a vacuum pump and an associated motor enclosed within said housing, said motor connected to said power supply through a pump switch of emptiness; and a vacuum hose connected to said vacuum pump, which extends from said housing, and ends in a pneumatic accessory, wherein a vacuum brake system of a trailer can be connected to and not subjected to pressure from said signal tester. trailer. 18.- A trailer signal tester to perform safety checks on trailers that have lighting and signaling circuits, which comprises: a carriage having a housing, wheels that support said carriage, and a handle to maneuver said carriage and fixed to the same, electrical circuit enclosed within said housing, and that can be connected and that corresponds to and that activates and selectively indicates lighting and signaling circuits of the trailer, it also comprises a supply of electric power and subcircuits "5 serving a lighting and signaling circuit, each said subcircuit has a switch to selectively control its respective subcircuit, an overcurrent protective device, and \ $ an indicator lamp that responds to successful activation of each said subcircuit, each said switch, said protective device 10 overcurrent, and said indicator lamp mounted on and accessible from outside said housing; and a four-conductor modular cable connector, a six-conductor modular cable connector and a seven-conductor modular cable connector, wherein said 15 towing signal is compatible with small trailers, cargo trailers, mobile homes, recreational trailers and horse trailers, each said modular cable connector has a plurality of conductors, each individual conductor corresponds to a lighting function and signaling of the 20 trailer, individual conductors for each lighting function and similar signaling of each modular cable connector being connected in parallel by said electrical circuit to said predetermined subcircuit, where similar functions are activated and tested on trailers having modular cable connectors 25 different by said designated subcircuit; and an air compressor and associated motor enclosed within said housing, said motor connected to said power supply through an air compressor switch; and at least one pneumatic hose connected to said 5 air compressor, which extends from said housing, and ends in a manual connection, wherein a pneumatic system of a trailer can be connected to and subjected to pressure from said trailer signal tester. 19. The trailer signal tester according to claim 18, wherein it further comprises: a hydraulic pump and an associated motor enclosed within said housing, said motor connected to said power supply through a pump switch hydraulics; a container of hydraulic fluid communicating with said hydraulic pump; and a hydraulic hose connected to said hydraulic pump, which extends from said housing, ends in a hydraulic fitting, wherein a hydraulic system of a trailer can be connected to and subjected to pressure from said signal tester 20 of tow. 20. The trailer signal tester according to claim 18, wherein it further comprises: a vacuum pump and an associated motor enclosed within said housing, said motor connected to said power supply through a power switch. vacuum pump; and a vacuum hose connected to said vacuum pump, which extends from said housing, and ends in a pneumatic accessory, wherein a vacuum brake system of a trailer can be connected to and not subjected to pressure from said tester 5 of trailer signal.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08528643 | 1995-09-07 |
Publications (1)
Publication Number | Publication Date |
---|---|
MXPA98001842A true MXPA98001842A (en) | 1999-05-31 |
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