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US2245601A - Method of and apparatus for lubricating pneumatic tools - Google Patents

Method of and apparatus for lubricating pneumatic tools Download PDF

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Publication number
US2245601A
US2245601A US254761A US25476139A US2245601A US 2245601 A US2245601 A US 2245601A US 254761 A US254761 A US 254761A US 25476139 A US25476139 A US 25476139A US 2245601 A US2245601 A US 2245601A
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Prior art keywords
valve
air
pressure
lubricant
entraining
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Expired - Lifetime
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US254761A
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Charles A Medsker
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WILLIAM L ULMER
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WILLIAM L ULMER
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Priority to US254761A priority Critical patent/US2245601A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25DPERCUSSIVE TOOLS
    • B25D17/00Details of, or accessories for, portable power-driven percussive tools
    • B25D17/26Lubricating
    • B25D17/265Lubricating the lubricant being entrained to the machine parts by the driving fluid
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16NLUBRICATING
    • F16N7/00Arrangements for supplying oil or unspecified lubricant from a stationary reservoir or the equivalent in or on the machine or member to be lubricated
    • F16N7/30Arrangements for supplying oil or unspecified lubricant from a stationary reservoir or the equivalent in or on the machine or member to be lubricated the oil being fed or carried along by another fluid
    • F16N7/32Mist lubrication
    • F16N7/34Atomising devices for oil

Definitions

  • This invention relates to a novel method of and apparatus for lubricating pneumatic tools, such as hammers, riveters, rock drills, welding machines and similar power tools utilizing air pressure as their source of power.
  • FIG. 1 is a vertical cross-sectional view through the apparatus
  • Fig. 2 is an enlarged cross-sectional view of the valve mechanism illustrated in Fig. 1.
  • the apparatus will be seen to comprise a container I into which the main air pressure supply is introduced through the inlet 2.
  • This inlet is provided at its lower end with a cylindrical screen 3 for entrapping dirt and other foreign matter in the air supply,
  • the container has a horizontal dividing wall 4 which separates the interior of the container into an upper moisture and foreign particle eliminating or precipitating compartment and a lower oil entraining compartment. Excess moisture and foreign particles entrained in the air supply are precipitated and eliminated in this upper chamber, due to the increase in volume or expansion of the air stream and also its change in direction of flow.
  • a pipe or conduit 5 leads from the upper portion of the upper chamber of the container I, through the wall 4, to the lower portion of the lower compartment of the container, where it connects with an elbow 5.
  • a check valve 1 which prevents reverse or flow back-up from the oil entraining compartment.
  • an elbow 8 which rests on a perforated baffle plate or screen 9 extending across the oil entraining compartment and spaced somewhat from the bottom of the container.
  • the upper end of the conduit 5 has mounted thereon a cylindrical screen l3, so that the air entering this conduit must pass through this screen.
  • Another conduit l4 leads from the upper end of the screen l3 through the upper wall of the container and has connected to its upper end a reducing elbow l5, from which extends a nipple I 6.
  • This nipple communicates with the inlet opening ofa pressure regulating and reducing valve, which has been generally designated by the reference numeral H.
  • the reducing valve [1, as best shown in Fig. 2, comprises a body 18, having an inlet opening IS an an outlet opening 20, the outlet opening communicating with a conduit 2
  • the valve body l8 has secured thereto a cover 22, and a diaphragm 23 is interposed between the body and cover.
  • the body has secured in its lower central portion a plug 24, in which is slidably mounted a valve stem 25 which cooperates with the valve seat 25, the valve stem being urged against its seat by means of a coil spring 21.
  • the valve stem 25 establishes communication between the inlet l9 and the valve compartment 28 below the diaphragm 23, and the compartment 28 in turn is in communication with the outlet opening 2!! by means of a passageway 29.
  • the cover 22 has an axial bore 30 therein, in which is disposed a coil spring 3
  • a lock nut 35 is mounted on the screw 33 to lock it in adjusted position.
  • bears against a washer 3'5 which is secured, as by nuts 31, to an eXtension 3S of the valve stem 25.
  • an opener element 39 Secured to the lower end of the valve stem 25 is an opener element 39 having a reduced lower end Ml which bears against the needle 4
  • the valve 42 has a tapered seat 43 therein against which the needle bears when the valve is closed.
  • has an enlarged base portion "is and a spring 45 is interposed between this base portion and a plug it secured to the lower end of the valve.
  • a conduit t? establishes communication between the reducing elbow l2 and the valve 42.
  • An oil filler pipe 59 is also provided for admitting oil into the lower compartment of the container.
  • Vents 5i and 52 are located in the side wall of the container l and in communication with the upper and lower chambers, respectively. Drain cocks 53 and 5 are also connected to the bottoms of each one of these two chambers. An oil test cock 55 is also mounted in the side wall of the container for ascertaining when the oil is at the desired level.
  • the operation of the above described apparatus is as follows:
  • the main air supply is introduced through the inlet 2, and passes into the upper chamber of the container, where excess moisture and foreign particles are precipitated.
  • This air supply then follows the direction of the arrows through the screen i3 and thence the stream is divided to the conduits and ii.
  • That portion of the air stream going through the conduit 5 passes up through the bath of the lubricant or oil in the lower chamber of the container 1 where it entrains particles of lubricant in the form of a fog or a vapor, and such lubricantcontaining air then enters the conduit NJ and passes into the reducing valve H by way of the elbow l2, conduit ll, and valve 42, where it is mixed with the remainder of the air stream from conduit l4, and nipple Hi.
  • the reducing valve I! automatically serves to maintain a constant pressure dilferential between the air entering the valve and that leaving the valve.
  • the spring 3! forces the valve open, thereby restoring the out-going pressure to its original value within the limits of the main air supply pressure.
  • the diaphragm is forced against the spring and the valve closes.
  • the valve is preferably set at pounds below the main air supply line pressure, so that a 10 pound differential is maintained at all times irrespective of the air demand.
  • valve 42 Due to the operation of the valve 42 simultaneously with that of valve H. the pressure in the air-oil mixing chamber will be regulated in the same manner as that in the air line.
  • valve 97 opens and closes according to the demand, and since the valve 42 is actuated by the valve 17, the proportion of the air-oil mixture to the air is determined by the simultaneous movement of the two valves. Since the ratio is fixed, the final air-oil mixture is constant irrespective of the outlet demand for air.
  • the method of preparing lubricant-entraining air for the operation of pneumatic tools which comprises dividing an air stream into two parts, entraining a lubricant in one of said air streams, reuniting said lubricant-entraining air with said other air stream, and automatically maintaining the proportion which each division of said air stream bears with respect to the other, irrespective of the demand of said tools within the limits of the pressure of said first-named air stream.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Nozzles (AREA)

Description

June 17, 1941.
C. A MEDSKER METHOD OF AND APPARATUS FOR LUBRICATING PNEUMATIC TOOLS E .57 E 3 22 "7 8 i N ZZ 27 j I I I /a 59 I 5 Filed Feb. 6, 1939 HHl'llHll INVENTOR.
CHARLES A. MEDsKER BY #044- j? ATTORNE Patented June 17, 1941 METHOD OF AND APPARATUS FOR LUBRICATING PNEUMATIC TOOLS Charles A. Medsker, Cleveland Heights, Ohio, assignor to William L. Ulmer, Cleveland, Ohio Application February 6, 1939, Serial No. 254,761
7 Claims.
This invention relates to a novel method of and apparatus for lubricating pneumatic tools, such as hammers, riveters, rock drills, welding machines and similar power tools utilizing air pressure as their source of power.
In my co-pending application, Serial No. 206,414, there is disclosed an apparatus whereby a lubricant, such as oil, in a finely divided, vaporous or suspended form, is entrained in the air pressure supply for pneumatic tools and the like. In that apparatus, the amount and proportion of lubricant entrained in the ultimate air supply delivered to the tool lines is variably regulated by means of control valves provided for this purpose.
It has been found, however, that in cases where the air supply demand increases to any considerable extent that a drop in the air pressure occurs ahead of the-valve openings without a corresponding increase in the pressure behind the valve openings. This results in an undesired variation in the amount of oil entrained in the air, and makes it necessary to frequently adjust the valves in order to compensate for the varia tion in pressure and maintain the desired differential between the pressures ahead and behind the valve openings, which, in actual practice, should be approximately pounds. Such adjustments are not only difficult, but are time-consuming as well.
It is a primary object of the present invention to provide in combination with apparatus of the aforesaid character valve mechanism whereby a constant differential is maintained between the pressures ahead of and behind the valve openings and whereby uniformity in the air-oil ratio is maintained at all times irrespective of the demands made upon the apparatus.
To the accomplishment of the foregoing and related ends, said invention, then, consists of the means hereinafter fully described and particularly pointed out in the claims; the annexed drawing and the following description setting forth in detail certain means of carrying out the invention, such disclosed means illustrating, however, but one of various ways in which the principle of the invention may be used;
In said annexed drawing Fig. 1 is a vertical cross-sectional view through the apparatus; and
Fig. 2 is an enlarged cross-sectional view of the valve mechanism illustrated in Fig. 1.
Referring more particularly to the drawing, the apparatus will be seen to comprise a container I into which the main air pressure supply is introduced through the inlet 2. This inlet is provided at its lower end with a cylindrical screen 3 for entrapping dirt and other foreign matter in the air supply,
The container has a horizontal dividing wall 4 which separates the interior of the container into an upper moisture and foreign particle eliminating or precipitating compartment and a lower oil entraining compartment. Excess moisture and foreign particles entrained in the air supply are precipitated and eliminated in this upper chamber, due to the increase in volume or expansion of the air stream and also its change in direction of flow.
A pipe or conduit 5 leads from the upper portion of the upper chamber of the container I, through the wall 4, to the lower portion of the lower compartment of the container, where it connects with an elbow 5. To this elbow is joined a check valve 1, which prevents reverse or flow back-up from the oil entraining compartment. To the other end of the valve 1 is secured an elbow 8, which rests on a perforated baffle plate or screen 9 extending across the oil entraining compartment and spaced somewhat from the bottom of the container.
A conduit H] having a screen H on its lower end, extends from the upper portion of the oil entraining compartment through the wall 4 and upper compartment of the container through the upper wall of the container and has fitted to its upper end a reducing elbow I2. I
The upper end of the conduit 5 has mounted thereon a cylindrical screen l3, so that the air entering this conduit must pass through this screen. Another conduit l4 leads from the upper end of the screen l3 through the upper wall of the container and has connected to its upper end a reducing elbow l5, from which extends a nipple I 6. This nipple communicates with the inlet opening ofa pressure regulating and reducing valve, which has been generally designated by the reference numeral H.
The reducing valve [1, as best shown in Fig. 2, comprises a body 18, having an inlet opening IS an an outlet opening 20, the outlet opening communicating with a conduit 2|, from which branch lines, not shown, may lead to the individual pneumatic tools. The valve body l8 has secured thereto a cover 22, and a diaphragm 23 is interposed between the body and cover. The body has secured in its lower central portion a plug 24, in which is slidably mounted a valve stem 25 which cooperates with the valve seat 25, the valve stem being urged against its seat by means of a coil spring 21. The valve stem 25 establishes communication between the inlet l9 and the valve compartment 28 below the diaphragm 23, and the compartment 28 in turn is in communication with the outlet opening 2!! by means of a passageway 29.
The cover 22 has an axial bore 30 therein, in which is disposed a coil spring 3| which bears l at its upper end against a washer 32 secured to the lower end of a screw 33 in threaded engagement with a plug 34. A lock nut 35 is mounted on the screw 33 to lock it in adjusted position. The lower end of the spring 3| bears against a washer 3'5 which is secured, as by nuts 31, to an eXtension 3S of the valve stem 25.
Secured to the lower end of the valve stem 25 is an opener element 39 having a reduced lower end Ml which bears against the needle 4| of a needle valve 22 secured to the plug in axial alignment with the latter. The valve 42 has a tapered seat 43 therein against which the needle bears when the valve is closed. The needle 4| has an enlarged base portion "is and a spring 45 is interposed between this base portion and a plug it secured to the lower end of the valve. A conduit t? establishes communication between the reducing elbow l2 and the valve 42.
An oil filler pipe 59 is also provided for admitting oil into the lower compartment of the container.
Vents 5i and 52 are located in the side wall of the container l and in communication with the upper and lower chambers, respectively. Drain cocks 53 and 5 are also connected to the bottoms of each one of these two chambers. An oil test cock 55 is also mounted in the side wall of the container for ascertaining when the oil is at the desired level.
The operation of the above described apparatus is as follows: The main air supply is introduced through the inlet 2, and passes into the upper chamber of the container, where excess moisture and foreign particles are precipitated. This air supply then follows the direction of the arrows through the screen i3 and thence the stream is divided to the conduits and ii. That portion of the air stream going through the conduit 5 passes up through the bath of the lubricant or oil in the lower chamber of the container 1 where it entrains particles of lubricant in the form of a fog or a vapor, and such lubricantcontaining air then enters the conduit NJ and passes into the reducing valve H by way of the elbow l2, conduit ll, and valve 42, where it is mixed with the remainder of the air stream from conduit l4, and nipple Hi.
The reducing valve I! automatically serves to maintain a constant pressure dilferential between the air entering the valve and that leaving the valve. Thus, if the pressure at the outlet drops due to a heavy increase in the demand, the spring 3! forces the valve open, thereby restoring the out-going pressure to its original value within the limits of the main air supply pressure. If the outgoing pressure increases, the diaphragm is forced against the spring and the valve closes. By screwing down the adjusting screw 33 the low pressure is increased, and by releasing the screw, the low pressure is decreased. The valve is preferably set at pounds below the main air supply line pressure, so that a 10 pound differential is maintained at all times irrespective of the air demand.
Due to the operation of the valve 42 simultaneously with that of valve H. the pressure in the air-oil mixing chamber will be regulated in the same manner as that in the air line.
Since the valve 97 opens and closes according to the demand, and since the valve 42 is actuated by the valve 17, the proportion of the air-oil mixture to the air is determined by the simultaneous movement of the two valves. Since the ratio is fixed, the final air-oil mixture is constant irrespective of the outlet demand for air.
Other forms may be employed embodying the features of my invention instead of the one herein explained, change being made in the form or construction, provided the elements stated by any of the following claims or the equivalent of such elements be employed.
I therefore distinctly point out and distinctly claim as my invention:
1. In apparatus of the character described, the combination of a source of air under pressure, means for dividing said air into two streams, means for entraining a lubricant in one of said air streams, and means for reuniting said lubricant-entraining air with said other stream, said last-named means comprising a valve and means associated with said valve for maintaining a uniform pressure difierential between the mixture entering said valve and that leaving said valve.
2. In apparatus of the character described, the
combination of a source of air under pressure,
means for dividing said air into two streams, means for entraining a lubricant in one of said air streams, a Valve for receiving said lubricantentraining air stream along with said other air stream, and a second valve actuatable by said first valve for controlling the amount of lubricant-entraining air stream admitted to said firstnamed valve.
3. The method of preparing lubricant-entraining air for the operation of pneumatic tools, which comprises dividing an air stream into two parts, entraining a lubricant in one of said air streams, reuniting said lubricant-entraining air with said other air stream, and automatically maintaining the proportion which each division of said air stream bears with respect to the other, irrespective of the demand of said tools within the limits of the pressure of said first-named air stream.
i. In apparatus of the character described, the combination of a source of air under pressure, means for dividing said air into two streams. means for entraining a lubricant in one of said streams, means for reuniting said lubricant-entraining air with said other stream, and means for automatically maintaining the pressure of the mixture at a substantially predetermined value irrespective of the number of tools to which the mixture is conveyed.
5. In apparatus of the character described, the combination of a source of air under pressure means for entraining a lubricant in said air, a valve for controlling the flow of said lubricant entraining air, and resilient means for urging said valve open.
6. In apparatus of the character described, the combination of a source of air under pressure, means for entraining a lubricant in said air, a valve for controlling the flow of the lubricant entraining air, resilient means for urging said valve open, and means responsive to the pressure in said valve for counter-acting said resilient means.
7. In apparatus of the character described, the combination of a source of air under pressure, means for dividing said air into two streams, means for entraining a lubricant in one of said streams, and means for reuniting said lubricantentraining stream with said other stream, said last-named means comprising a chamber, a valve for controlling the flow of one of said streams to said chamber, the other of said streams being free to flow to said chamber, and means for releasing said reunited streams from said chamher and for controlling said valve.
CHARLES A. MEDSKER.
US254761A 1939-02-06 1939-02-06 Method of and apparatus for lubricating pneumatic tools Expired - Lifetime US2245601A (en)

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2442777A (en) * 1942-06-01 1948-06-08 Carl A Norgren Lubricant injecting means
US2613067A (en) * 1950-01-21 1952-10-07 Hills Mccanna Co Device for introducing atomized liquid into gas under pressure
US2740267A (en) * 1953-03-04 1956-04-03 Bayard Gaston Cooling turbine system
US2850323A (en) * 1955-07-15 1958-09-02 Arrow Tools Inc Mist coolant atomizer
DE1185130B (en) * 1958-11-03 1965-01-07 Walter Blattner Transportable device for lubricating and cleaning compressed air tools
US3666245A (en) * 1967-02-14 1972-05-30 Dentatus Ab Device for mixing a gas current under pressure with an atomized mist of liquid fluid, such as lubricating oil
US3693757A (en) * 1970-08-03 1972-09-26 Mccord Corp Lubricating apparatus
US3905451A (en) * 1973-11-29 1975-09-16 James Byron Williamson Pressure oiling system and oiling valve assembly
US3939944A (en) * 1974-07-24 1976-02-24 Bryant Grinder Corporation Oil-mist lubrication system
DE3028125A1 (en) * 1979-05-25 1981-02-19 Uniwave Inc LUBRICANT DISTRIBUTOR
US6199465B1 (en) * 1996-11-29 2001-03-13 Fuji Koeki Co., Ltd. Liquid coater
US20020061236A1 (en) * 2000-10-26 2002-05-23 Fuji Koeki Co., Ltd. Cutting-oil coater and cutting device
US6659370B1 (en) 1998-05-25 2003-12-09 Fuji Bc Engineering Co., Ltd. Liquid spray device and cutting method

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2442777A (en) * 1942-06-01 1948-06-08 Carl A Norgren Lubricant injecting means
US2613067A (en) * 1950-01-21 1952-10-07 Hills Mccanna Co Device for introducing atomized liquid into gas under pressure
US2740267A (en) * 1953-03-04 1956-04-03 Bayard Gaston Cooling turbine system
US2850323A (en) * 1955-07-15 1958-09-02 Arrow Tools Inc Mist coolant atomizer
DE1185130B (en) * 1958-11-03 1965-01-07 Walter Blattner Transportable device for lubricating and cleaning compressed air tools
US3666245A (en) * 1967-02-14 1972-05-30 Dentatus Ab Device for mixing a gas current under pressure with an atomized mist of liquid fluid, such as lubricating oil
US3693757A (en) * 1970-08-03 1972-09-26 Mccord Corp Lubricating apparatus
US3905451A (en) * 1973-11-29 1975-09-16 James Byron Williamson Pressure oiling system and oiling valve assembly
US3939944A (en) * 1974-07-24 1976-02-24 Bryant Grinder Corporation Oil-mist lubrication system
DE3028125A1 (en) * 1979-05-25 1981-02-19 Uniwave Inc LUBRICANT DISTRIBUTOR
US4353435A (en) * 1979-05-25 1982-10-12 Uniwave, Inc. Wide flow-range lubricant distributor
US6199465B1 (en) * 1996-11-29 2001-03-13 Fuji Koeki Co., Ltd. Liquid coater
US6460831B2 (en) 1996-11-29 2002-10-08 Fuji Bc Engineering Co., Ltd. Cutting liquid coater
US6679484B2 (en) 1996-11-29 2004-01-20 Fuji Bc Engineering Co., Ltd. Cutting liquid coater
US6659370B1 (en) 1998-05-25 2003-12-09 Fuji Bc Engineering Co., Ltd. Liquid spray device and cutting method
US20020061236A1 (en) * 2000-10-26 2002-05-23 Fuji Koeki Co., Ltd. Cutting-oil coater and cutting device
US6773212B2 (en) 2000-10-26 2004-08-10 Fuji Koeki Co., Ltd. Cutting-oil coater and cutting device

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