MOBILE PNEUMATIC COMPRESSOR
A mobile pneumatic compressor includes an electric motor and a compressor mounted within a compressor housing. A battery mounted to the compressor powers the motor. A frame may surround the compressor housing, and a carrier, including storage compartments, may be mounted to the frame. The frame may comprise a sealed member allowing the frame to be used as a tank for providing a compressed gas reserve. The compressor includes a support mechanism, such as a belt or shoulder strap, allowing the compressor to be borne by a user.
Embodiments of the present invention relate to pneumatic compressors. More particularly, embodiments of the present invention relate to mobile pneumatic compressors that are capable of being borne by a user.
BACKGROUND OF THE INVENTIONPortable pneumatic tools such as pneumatic tools each require a source of compressed air. Currently, almost all portable pneumatic tools rely upon external air compressors to deliver compressed air via a flexible compressed air hose. External air compressors are typically either shop models or so-called portable models.
Shop air compressors are large, heavy compressors that are often fixed in place and not designed to be frequently moved from one work site to another. An immovable shop air compressor and compressed air hose of finite length limit the ability to take the portable pneumatic tool to where the work is to be performed. The portable pneumatic tool is, in effect, tethered to the fixed shop air compressor and its portability is thereby reduced.
Known portable air compressors do have the ability to be transported from one work site to another. Still, many remain relatively immobile, being heavy or bulky and awkward to transport—requiring time and manpower to move between worksites. Once known portable air compressors are moved to the worksite, their relative lack of mobility means that they face many of the same limitations of shop air compressors, requiring long hoses to bring the compressed air from the compressor to the tool. Additionally, some areas of a worksite, such as upper floors, roofs, scaffolding, etc. may be inaccessible to portable compressors because of their weight, size and lack of real portability. When the portable air compressor cannot be easily moved around the worksite, the portability of the pneumatic tool tethered to the compressor is in turn limited.
The lightest and most portable of the portable air compressors are powered by an electric motor. However, many electric powered models then require access to an external electrical power source, which is an additional limitation to the portable compressor's portability. An example of such a prior art portable air compressor is described in U.S. Pat. No. 6,551,066 for a High Pressure Portable Air Compressor, the entire disclosure of which is incorporated herein by reference.
The utility of a hand-held pneumatic fastening tool, one type of portable pneumatic tool, is particularly affected by its dependence upon relatively immobile air compressor. Hand-held pneumatic fastening tools are designed to be quickly carried by hand to where a fastener is to be driven into a workpiece. As explained above, an immobile external air compressor connected to the tool complicates moving the hand-held pneumatic fastening tool around the work site. Setup time can also be a problem, especially when only a few fasteners are to be driven. The time required to move, setup and connect an immobile air compressor to the hand-held pneumatic fastening tool is proportionately high compared to the actual working time of the tool. In some cases, it may take longer to move and setup the external air compressor than to drive the fastener by hand. In such cases, a user will naturally resort to manually driving the fastener with a hammer.
Relatively light-weight, portable inflators are known in the art. For example, U.S. Pat. No. 6,095,762 discloses a battery powered inflator. Such inflators do not have control systems or air reservoirs suitable for use in powering pneumatic tools.
SUMMARY OF THE INVENTIONAn embodiment of a mobile pneumatic compressor comprises: a compressor, an electric motor operatively connected with the compressor for driving the compressor, a compressor housing at least partially enclosing the compressor and electric motor, a battery selectively powering the electric motor, a port in fluid communication with the compressor, a compressed air line removably connected to the port for connecting the compressor with a pneumatic tool, a carrier attached to the compressor and comprising a storage compartment, and a support mechanism passively connecting the compressor with a user's body.
In further embodiments, the carrier may have one or more storage compartments formed from a non-rigid material such as leather, canvas, or nylon fabric. Additionally, a shoulder strap or belt may be used by the user to bear the compressor assembly, and the rechargeable battery may be a standardized battery that can be used in conjunction with the compressor assembly and with other electric power tools.
In another embodiment, a pneumatic compressor assembly for use with a portable, battery powered air compressor comprises: a compressor, an electric motor operatively connected with the compressor for driving the compressor, and a compressor housing at least partially enclosing the compressor and electric motor, a battery selectively powering the electric motor, a port in fluid communication with the compressor, a compressed air line removably connected to the port for connecting the compressor with a pneumatic tool, and a frame at least partially surrounding the compressor housing, wherein the frame comprises a sealed portion providing a compressed gas reserve.
In further embodiments, the pneumatic compressor may comprise a support mechanism passively connecting the compressor with a user's body. Additionally, the frame may be formed from a tubular member, and the tubular member may be sealed to form the gas reserve.
In another embodiment, a mobile pneumatic compressor comprises: a compressor, an electric motor operatively connected with the compressor for driving the compressor, a compressor housing at least partially enclosing the compressor and electric motor, a battery selectively powering the electric motor, a port in fluid communication with the compressor, a compressed air line removably connected to the port for connecting the compressor with a pneumatic tool, a frame at least partially surrounding the compressor housing, and a support mechanism passively connecting the compressor with a user's body.
In further embodiments, the frame may comprise a reservoir portion providing a compressed gas reserve, and the support mechanism may comprise a shoulder strap or a belt. Additionally, the pneumatic compressor may comprise a carrier attached to the compressor, and the frame may comprise a handle for lifting the compressor.
The following description is intended to convey a thorough understanding of the embodiments by providing a number of specific embodiments and details involving a wheel storage rack. It is understood, however, that the invention is not limited to these specific embodiments and details, which are exemplary only. It is further understood that one possessing ordinary skill in the art, in light of known devices, systems and methods, would appreciate the use of the invention for its intended purposes and benefits in any number of alternative embodiments.
Through the description, reference is made to specific examples of pneumatic tools, for example a pneumatic brad nailer. However, the invention is not limited to a specific pneumatic tool or type of tool and is applicable to any portable pneumatic tool for which the compressor is capable of supplying sufficient volume and pressure of compressed air. As the energy density of batteries increases with technology advancements in the future, this invention will become more practical to apply to more and more portable pneumatic tools.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention. As used throughout this disclosure, the singular forms “a,” “an,”and “the” include plural reference unless the context clearly dictates otherwise. Thus, for example, a reference to “a battery” is a reference to one or more batteries and equivalents thereof known to those skilled in the art. Additionally, terms such as “mounted,” “attached” and “connected” shall be broadly construed to mean both permanent and detachable attachment of one part to another, as well as two parts which have been jointly formed as a unitary component. The term mounted shall also include the attachment of one part to another where some degree of relative movement between the two parts is still permitted and shall also include both the direct mounting of one part to another, or the indirect mounting of two parts via other parts.
Commonly assigned U.S. Published Patent Application No. 2002/0158102 discloses a mobile compressor directly attached to a pneumatic tool or attached to a user's body, and copending U.S. patent application Ser. No. 11/415,268 discloses an AC/DC powered pneumatic compressor. U.S. Published Patent Application No. 2002/0158102 and U.S. patent application Ser. No. 11/415,268 are hereby incorporated by reference.
The mobile compressor 10 would be sufficiently small in size and light in weight to be borne by the user such as, for example, on the user's belt. The mobile compressor 10 could also be borne by the user in other fashions. What is meant by “borne by the user” is that the mobile compressor 10 is releasably attached to the user's body or clothing in some manner so that it can be passively carried around with the user. The mobile compressor 10 could have various support mechanisms permitting the compressor to be borne by the user which include a belt, belt loop, shoulder straps, hooks, clips, hook-and-loop type fasteners, or any other mechanism for releasably attaching the compressor 10 to the user's body or clothing.
Each embodiment further comprises a battery 300 for powering the electric motor. The battery may be of any suitable type or configuration of battery or battery pack as would be apparent to one of skill in the art. For example, the battery 300 may be fixedly or releasably mounted to the compressor housing 110 and may be mounted internally or on an external surface. The battery 300 may comprise one or more batteries and may be disposable or rechargeable. Additionally, the battery may be adapted to be used interchangeably with other power tools. Examples of battery units that could be used in conjunction with various embodiments of the compressor assembly and pneumatic tool as described herein are shown in commonly assigned U.S. Pat. No. 5,144,217, which teaches a plug-in type battery pack, and U.S. Pat. No. 6,057,608, which teaches a rail-type or slide-on battery pack. Each of these patents is hereby incorporated by reference.
Referring to the embodiment shown in
An embodiment of the compressor assembly shown in
Further, as illustrated in
A further embodiment of a compressor assembly is shown in
The embodiment of the compressor assembly shown in
In an embodiment of the mobile compressor 10 illustrated in
The rearward shell 56 is pivotally attached to the lower shell 58 to form a clamshell cover for the components of the compressor assembly. Vents 64 are formed in the rearward shell 56 to allow air to enter the compressor. Alternatively, these vents 64 may be formed in other shells of the housing 52. The gauges 14, dial 28 and coupling 16 are positioned on a top surface 66 of the forward shell 54. A handle 68 extends above the top surface 666 and protects the gauges 14, dial 28 and coupling 16 from impact in addition to providing a handle for maneuvering the housing 52. The handle 68 may be fixedly or pivotally mounted and may cooperate with a latching mechanism to selectively hold the rearward shell 56 closed. Alternatively, the gauges 14, dial 28 and coupling 16 may be positioned elsewhere on the housing 52 as convenient and may be protected by roll bars 12 or other projections as shown in
The backpack 70 may include a rigid internal frame with legs that extend into a portion 78 of the belt 34 providing a stable base to support the backpack 70 in an upright position when the backpack is placed on a surface. The backpack 70 may comprise a flexible material such as leather, canvas, or nylon fabric as would be known to one of skill in the art. Alternatively, portion of the backpack, such as the compressor compartment 72, may be formed of or reinforced with rigid or semi-rigid material like plastic, metal or other appropriate materials. Carriers 30 may be attached to the belt 34 for holding other tools and hardware as convenient for the user.
The scope of the invention is not intended to be limited to any particular design for the compressor assembly. Indeed, the compressor assembly can be of any appropriate design capable of being.
The particular compressor assembly 100 in the illustrated embodiment will now be described with reference to
Permanent magnet stator 337 includes permanent magnets 335. Permanent magnets 335 may each be a semi-cylindrical magnet member adhered to an inner surface of motor can 314 on opposite sides thereof. It should be understood that permanent magnet stator 337 could include more than two permanent magnets 335, such as four, six, eight, etc.
Armature 333 has an armature shaft 336 around which are positioned laminations 338 in which windings 340 are wound, and a tubular insulative member or sleeve 342 surrounding armature shaft 336. A commutator 332 is affixed on one end of armature shaft 336. Brush system 343 includes brushes 334 at least partially enclosed in brush boxes 344, which are electrically coupled to a power source, such as to an output of a rectifier. Shunts 346 electrically connect brushes 334 to their respective brush boxes 344. Springs 348 resiliently bias the brushes 334 against the commutator 332. Opposed ends of armature shaft 336 are received in front and rear bearings 350 and 352. A fan 330 is affixed to one end of armature shaft 336.
Referring again to
The compressor 130 of the illustrated embodiment is a positive displacement, piston type compressor. In particular, the compressor 130 has a bore of about 1.2 inches and a stroke of about 0.8 inches resulting in a displacement of about 0.9 cubic inches. Other types of compressors may also be used, including rotary displacement compressors and gear type compressors, as desired. Additionally, the compressor may be of the permanently lubricated, oil free, or oil lubricated type. The compressor 130 comprises an integral crank and counterweight 131, a connecting rod 132 and a compressor piston 133 (
Referring to
The dashed lines and arrows in
A compressed air reservoir stores the compressed air from the compressor 130 until it is used to power the pneumatic tool. Many pneumatic tools, such as pneumatic fasteners, already have a passageway formed in the handle leading from a compressed air hose coupler to the valve assembly, and a compressed air reservoir may be adequately provided by such an existing passageway, or by such an existing passageway in combination with a compressed air hose. Or, the compressed air reservoir may be provided by a small external tank 94 mounted to the compressor assembly 100 or by a portion of a frame 20 surrounding the compressor assembly as discussed above.
As illustrated in
The onboard battery 300 is not the only possible electrical power source for powering the compressor assembly 100, however. In another embodiment, the electrical power source may be an electric power cord that delivers electrical power from an external electrical power source. For example, referring to the schematic representation in
Embodiments of the compressor assembly comprise a power conditioning circuit 360, a battery 300, an electric motor 120, and a compressor 130. The operator may selectively choose to use either AC power or DC battery power, or a control system may automatically choose the power source based on factors such as: which power sources are currently connected, the state of charge in the battery, the power demands of the compressor, or other relevant factors. A preferred embodiment would accommodate an AC power source of about 90 VAC to about 260 VAC and about 48 Hz to about 63 Hz, or alternatively, a DC battery power source of about 7.0 VDC to about 43 VDC.
When the compressor assembly is electrically connected with an AC power source 302, such as a typical wall socket via an electrical cord, an AC voltage feeds into the power conditioning circuit 360. The power conditioning circuit 360 converts the AC power input to a DC voltage output at a level required by the electric motor 120. The power conditioning circuit output is preferably in the range from about 6.0 VDC to about 43 VDC and may be fixed or adjustable. An embodiment of the power conditioning circuit 360 may comprise a regulated switching power supply. Alternatively, any other appropriate power conditioning circuit may be used as would be apparent to one of skill in the art. Embodiments of the compressor assembly may include a mechanical interlock 362 that disconnects the output of the power conditioning circuit when a battery is connected. Further embodiments may comprise a relay to disconnect the battery output when the compressor assembly is connected with an AC power source.
The DC voltage input would preferably be a single voltage input and may comprise a nickel cadmium, lithium ion, nickel metal hydride, or other appropriate battery 300. Alternatively, the power conditioning circuit 360 may comprise a regulator circuit, implementing a multi-voltage adaptor. The multi-voltage adaptor allows a variety of batteries to power the compressor assembly. Embodiments of the compressor assembly including a multi-voltage adapter may be capable of utilizing a plurality of batteries, either singly or in combination. The batteries may have the same voltage or different voltages. The variation in voltage output may cause the total amount of work power to vary, but would not effect the shot by shot performance of a pneumatic nail gun or other tool connected with the compressor assembly. Further embodiments of the compressor assembly may incorporate a battery charger that would recharge the battery when the unit is connected to AC power.
Referring again to
As illustrated in
In the manner described, embodiments of the compressor assembly may provide advantages of both a DC battery powered compressor and an AC powered compressor. The DC mode illustrated in
Referring to
The compressor housing 110 protects the user from any exposed moving parts of the compressor assembly 100 and from any parts of the compressor assembly 100 which may become very hot during use such as the compressor cylinder head 135. The compressor housing 110 can also enhance the clean aesthetic appearance of the mobile compressor 10. Air vents 111, 112 may be formed in the compressor housing 110 to allow cooling air to enter therein and cool the compressor assembly 100 and to allow intake air to reach intake valve 136. An air gap is left between the interior of the compressor cover 110 and the compressor assembly 100 to allow cooling air to flow between them. Additionally, ribs formed on the interior of the compressor cover 110 may be provided to create a shroud around the fan (not shown) of the electric motor 120. The shroud will direct the air inside of the compressor cover 110 through the fan, thus creating a flow of cooling air which enters the compressor cover 110 through one set of air vents 111, passes through the fan, and exits the compressor cover 110 through a second set of air vents 112. Because some of the air intake through the air vents 111 will enter the compressor 130, a screen 113 may be placed over the air vents 111 to help prevent debris from entering the compressor 130 or clogging the intake valve 136. Additionally, it may be desirable to include a foam filter between the screen 113 and the intake valve 136 to further help prevent a build-up of sawdust or other material from clogging the intake valve.
A pressure relief valve 230 may be connected to the compressed air reservoir 94 to relieve any excess pressure of the compressed air. In addition to being automatically actuated when the pressure of the compressed air exceeds a certain pressure, the pressure relief valve 230 may be arranged so that it is manually actuated when the battery 300 is detached from the compressor cover 110. A battery release button 310 is depressed to detach the battery 300 from the compressor cover 110 in a known manner. When the battery release button 310 is depressed, it pushes against a first end 261 of a lever 260. Lever 260 pivots about a point 262. When the lever 260 pivots upon activation of the battery release button 310, it pulls on the pressure relief valve 230, to which it is connected at a second end 263, causing the compressed air in the compressed air reservoir 94 to be released. It is thought that release of the compressed air when the battery 300 is removed may be desirable because users may mistakenly believe that the pneumatic tool cannot be activated after the battery 300 has been removed. For similar reasons, a switch 243 for turning the mobile compressor on and off can be arranged so that when the switch 243 is moved to the off position, it pushes against the lever 260, pivoting the lever 260 about point 262 and actuating the pressure relief valve 230 to release the compressed air.
In each of the embodiments described above, the compressor assembly may include a control system which turns the electric motor on and off according to the demand for compressed air. Of course, such a control system is not absolutely necessary because the compressor could be set to run continuously when the tool is in use while the pressure relief valve 230 relieves excessive compressed air if the supply does not match the demand. A control system may be preferable to this simple set-up, however, for several reasons set forth below in the description of possible control systems. In the description of each of the possible control systems, reference will be made to an illustrative embodiment of the invention as used with a cordless brad nailer. It should be understood that the described control systems might also be applied to any embodiment of the invention for use with any appropriate pneumatic tool, in a similar manner.
In one possible simple form, the control system will turn the electric motor 120 on when the pressure in the compressed air reservoir 94 is less then a first predetermined pressure and will turn the electric motor 120 off when the pressure is greater than a second predetermined pressure. The first and second predetermined pressures could be the same, if desired. The first and second predetermined pressures could be selectable by the user during use of the mobile compressor 10, or they could be set at the factory when the mobile compressor is built. In any of these possible combinations of features, the control system could simply comprise a pressure sensitive switch, or switches, which sense the pressure of compressed air in the compressed air reservoir 94 and which control the flow of electric energy to the electric motor 120. This control system will help conserve electrical power by not requiring that the compressor run continuously when the tool is in use. Conservation of electrical power is especially vital when an onboard battery powers the compressor 130.
This control system also makes using the mobile compressor 10 more comfortable. The compressor assembly 100 will create noise and vibration when in use that may bother the user if the noise and vibration are continuous.
In another form illustrated in the accompanying drawings, the control system could comprise a pressure transducer 241 (
In stage 3, the user pulls the trigger of the brad nailer to fire a brad. The measured pressure decreases as a result of the volume of compressed air lost to drive the brad. Because the measured pressure falls below Pmot in stage 4 the control circuitry 240 turns on the electric motor 120. When the measured pressure returns to the level of Pmax, the control circuitry 240 turns off the electric motor 120 in stage 5. In stage 6, the user pulls the trigger to fire a second brad. As before, the control circuitry 240 detects that the measured pressure has fallen below Pmot and turns on the electric motor 120 in stage 7. This illustrates the logic of the control circuitry 240 in a normal operating condition.
As shown in
The functioning of the green LED indicated in
The user may select the values of Pmax and Pmot during use of the nailer. The switch 243 may be provided with several positions each corresponding to a different set of values for Pmax and Pmot. The switch 243 may have a “Normal” and a “High” position. The mobile compressor is on when the switch 243 is in the “Normal” or the “High” position. The “High” position sets the values of Pmax and Pmot higher than the “Normal” position. The value of Pmin might also be controlled by the position of switch 243. Also, switch 243 may have more than two on positions for an even greater degree of adjustability. Alternatively, a dial 28 may be used to continuously or incrementally control the pressure settings.
The ability to select the values for Pmax and Pmot allows the user to tailor the operation of the mobile compressor to the work to be done. For example, as the type and size of the brad and the workpiece hardness varies, the minimum amount of driving force needed by the brad nailer to completely drive the brad will also vary. Adjustment of the values for Pmax and Pmot allows the pressure of the compressed air to be held closer to the minimum pressure corresponding to the minimum amount of driving force needed.
The tailoring of the values of Pmax and Pmot has several benefits. Electrical power will be conserved because the pressure of the compressed air used to drive the drive piston will not be dramatically greater than what is needed to drive the brad. Also, the efficiency of the compressor 130 increases as the pressure of the compressed air decreases. Conservation of electrical power is particularly important if the electrical power source is a battery. Also, the running time of the compressor assembly 100 will be minimized. Use of the tool could be uncomfortable if the compressor assembly 100 runs too much.
With reference to
In step 401 in
If the measured pressure is less than Pmot then the electric motor 120 is turned on in step 407. The position of switch 243 is detected again in step 408 and the values for Pmax and Pmot are established. Moving to point B in
If in step 414 the measured pressure is greater than Pmax, then the electric motor 120 is turned off in step 416. The position of switch 243 is detected again in step 421 and the pressure is measured and the LEDs are turned on and off in step 422. The measured pressure is judged against Pmot in step 423. If the measured pressure is greater than Pmot then the logic returns to step 3 and then to step 416 in
It is not desirable that this cycle of slowly discharging the compressed air reservoir 94 due to leakage and then recharging be allowed to continue indefinitely. If this cycle in stage 5 were allowed to continue indefinitely, then the charge of the battery 300 would be eventually exhausted. This tool idle situation is most likely to occur when the user puts away the mobile compressor without turning off the switch 243.
To prevent this undesirable cycle of slow discharging and recharging, the value of Timer 2 is judged in step 418 of
Point C in
When the measured pressure is judged less than Pmin in step 426 due to the continuing leakage from the compressed air reservoir 94, in step 427 the air pressure is measured again and the green LED is turned on to flash and the red LED is turned on to flash slowly. The flashing green and red LEDs are shown in stage 7 of
When the measured pressure is judged less than Psafe in step 428, the green LED is turned off and the red LED is turned on to flash slowly in step 429. The flashing red LED is shown in stage 8 of
Another brad is fired in stage 6 and finally the electric motor 120 stalls. The control circuitry 240 detects the stall in step 410 or 411 by detecting the voltage and current from the battery. If the battery voltage is less than a predetermined limit or if the battery current is greater than a predetermined limit, then the logic proceeds to step 1 and step 430 in
Point D in
If in step 432 the measured pressure is less than the value of Pmin, then in step 433 the pressure is again measured and the green LED is turned on to flash and the red LED is turned on. In step 434 the measured pressure is judged against the value of Psafe. If the measured pressure is greater than the value of Psafe, then the logic passes to step 7 and then to step 433 again. The logic loops between steps 433 and 434 until the measured pressure falls below the value of Psafe.
If the measured pressure is less than the value of Psafe in step 434, then in step 435 the green LED is turned off and the red LED is turned on. The logic remains at step 435 until the brad nailer is turned off. The red LED signals to the user that the nailer is in an auto shut-off procedure because the battery is exhausted.
Point E begins an auto shut-off procedure, which the control circuitry 240 enters when the valve 252 is left open, and the onboard compressor assembly 100 tries to recharge the compressed air reservoir 94. The disabled state of the compressor is shown by a “D” in the “Compressor” register in stage 2 of
If in step 438 the measured pressure is less than the value of Pmin, then in step 439 the pressure is again measured and the green LED and red LED are each turned on to flash. In step 440 the measured pressure is judged against the value of Psafe. If the measured pressure is less than the value of Psafe, then the logic passes to step 9 and then to step 439 again. The logic loops between steps 439 and 440 until the measured pressure falls below the value of Psafe.
If the measured pressure is less than the value of Psafe in step 440, then in step 441 the green LED is turned off and the red LED is turned on to flash. The logic remains at step 441 until the mobile compressor is turned off. The continuing flashing of the red LED signals to the user that the mobile compressor is in an auto shut-off procedure because the valve 252 has been left open.
The invention may be practiced in ways other than those particularly described in the foregoing description and examples. Numerous modifications and variations of the invention are possible in light of the above teachings and, therefore, are within the scope of the appended claims. The invention has been described with specific reference to particularly preferred embodiments and examples. Those skilled in the art recognize that various modifications may be made to the invention without departing from the spirit and scope thereof.
Claims
1. A mobile pneumatic compressor comprising:
- a compressor;
- an electric motor operatively connected with the compressor for driving the compressor;
- a compressor housing at least partially enclosing the compressor and electric motor;
- a battery selectively powering the electric motor;
- a port in fluid communication with the compressor;
- a compressed air line removably connected to the port;
- a carrier attached to the compressor, the carrier comprising a storage compartment; and
- a support mechanism connecting the compressor with a user's body.
2. The pneumatic compressor of claim 1 wherein the compressor further comprises a frame at least partially surrounding the compressor housing.
3. The pneumatic compressor of claim 2 wherein the carrier is mounted to the frame.
4. The pneumatic compressor of claim 1 wherein the carrier comprises multiple storage compartments.
5. The pneumatic compressor of claim 1 wherein the storage compartment comprises a first wall, the first wall being formed from a non-rigid material.
6. The pneumatic compressor of claim 5 wherein the non-rigid material comprises a material selected from the group consisting of leather, canvas, and nylon fabric.
7. The pneumatic compressor of claim 1 wherein the support mechanism comprises a shoulder strap.
8. The pneumatic compressor of claim 1 wherein the support mechanism comprises a belt securable around the user's waist.
9. The pneumatic compressor of claim 1 wherein the battery comprises a rechargeable battery removably mounted to the compressor housing.
10. The pneumatic compressor of claim 9 wherein the rechargeable battery is adapted to be used alternatively in conjunction with the compressor and with other electric power tools.
11. The pneumatic compressor of claim 9 wherein the compressor comprises a latch that secures the battery to the compressor housing and allows the battery to be released from the compressor housing without the use of additional tools.
12. A mobile pneumatic compressor comprising:
- a compressor;
- an electric motor operatively connected with the compressor for driving the compressor; and
- a compressor housing at least partially enclosing the compressor and electric motor;
- a battery selectively powering the electric motor;
- a port in fluid communication with the compressor;
- a compressed air line removably connected to the port for connecting the compressor with a pneumatic tool;
- a frame at least partially surrounding the compressor housing;
- wherein the frame comprises a reservoir portion providing a compressed gas reserve.
13. The pneumatic compressor of claim 12 further comprising a support mechanism connecting the compressor with a user's body.
14. The pneumatic compressor of claim 12 wherein the frame comprises a tubular member.
15. The pneumatic compressor of claim 14 wherein the tubular member is sealed to form the reservoir portion.
16. A mobile pneumatic compressor comprising:
- a compressor;
- an electric motor operatively connected with the compressor for driving the compressor;
- a compressor housing at least partially enclosing the compressor and electric motor;
- a battery selectively powering the electric motor;
- a port in fluid communication with the compressor;
- a compressed air line removably connected to the port for connecting the compressor with a pneumatic tool;
- a frame at least partially surrounding the compressor housing; and
- a support mechanism connecting the compressor with a user's body.
17. The pneumatic compressor of claim 16 wherein the frame comprises a reservoir portion providing a compressed gas reserve.
18. The pneumatic compressor of claim 16 wherein the support mechanism comprises a shoulder strap.
19. The pneumatic compressor of claim 16 wherein the support mechanism comprises a belt securable around the user's waist.
20. The pneumatic compressor of claim 16 further comprising a carrier attached to the compressor, the carrier comprising a storage compartment.
21. The pneumatic compressor of claim 16 wherein the frame further comprises a handle for lifting the compressor.
Type: Application
Filed: Jan 26, 2007
Publication Date: Jul 31, 2008
Inventors: Craig R. Steinfels (Jackson, TN), Dustin M. Lee (Eldorado, OH)
Application Number: 11/627,478
International Classification: F04B 53/00 (20060101);