US1245401A - Air-pump. - Google Patents

Description

OMLlNSOw,

AIR PUMP.

APPLICATION FILED FEB. 65. 1917. 1 ,ZfiAQl Patented Nov. 6, 1917.

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25 an 7 3 Z4 lwuamtoz JOHN K. TOMLINSON, on nononvnnrn, wns'r VIRGINIA.

AIR-PUMP.

Specification of Letters Patent.

Patented Nov. 6, 191,7.

7 Application filed February 6, 1917. Serial No. 146,958.

To all whom it may concern:

Be it known that I, JOHN K. TQMLINSON,

a citizen of the United States, residing at Ronceverte, in the county of Greenbrier and 5 State of WVest Virginia, have invented a new and useful Air-Pump, of which the following is a specification.

This invention relates to air pumps particularly designed for use in inflating the tires of automobiles and the like, one of the objects of the invention being to provide a double cylinder pump so constructed as to avoid all leakage of air such as has heretofore occurred where packing glands have been used in connection with double cylinder pumps.

A further object is to provide a pump which is simple, durable and compact and will not readily get out of order.

With the foregoing and other objects in View which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed, .can be made within the scope of what is claimed," without departing from the spirit of the invention.

In the accompanying drawings the preferred form of the invention has been shown.

In said drawings v Figure 1 is a side elevation of a pump embodying the present improvements, the same being shown collapsed, as when not in use.

Fig. 2 is an enlarged vertical longitudinal section through the pump and showing the positions of the parts while in use.

Fig. 3 is an enlarged vertical section through the base of the pump, said section being taken on the line 33 Fig. 4.

Fig. 4 is a section on line 4-t Fig. 1.

Referring to the figures by characters of reference 1 designates a base having a socket 2 communicating through a passage 3 with an upstanding tubular extension 4 preferably integral with the base and which extension has a radial tubular arm 5. A seat 6 for a check valve 7 is provided at the lower end of the tubular extension 4 and another seat 8 for a check valve 9 is provided at the inner end of the tubular arm 5. A nipple 10 is detachably mounted in the outer end of the arm 5 for engagement with a flexible tube a portion of which has been shown at 11, and which tube is adapted to be attached to the tire to be inflated. A nipple 12 is detachably connected to the upper end of the extension 4 and is engaged by one end of a flexible tube 13. The other end of this tube 13 engages a nipple 11 extending clownwardly from a cap 15 in which is formed a radial passage 16 which opens into the nipple 1d and also opens into a socket 17 receiving one end of a cylinder 18. The other end of this cylinder is closed as at 19 and slides within a tubular guide 20 upstanding from a wing.21 which extends laterally from the upper head 22 of a cylinder 23. This cylinder 23 is mounted at its through a port 24 into the radial passage 3. The base 1 is secured to the head 22 by rods 25 and slidably mounted within the head 22 and concentric with. the cylinder 23 is a piston rod 26 to the lower end of which is attached a piston 27 designed to reciprocate within the cylinder 23. The upper end of the rod 26 is attached to a handle 28 which may be ofany desired shape so as to be readily grasped by the user. A U-shaped piston rod 29 is secured at one end to the handle 28 and extends downwardly through a guide opening 30 in the wing 21 and parallel with the cylinder 23. Said rod then extends upwardly through an opening 31 in the head 19 and is provided with a piston 32 designed to work within the cylinder 18, this piston being arranged oppositely to the piston 27 ,and the two pistons being so positioned that when the piston 27 is moving downwardly to expel air from the cylinder ,23, the piston 32 is moving downwardly to recharge the cylinder 18.

Guide straps 33 are designed to embrace the parallel portions of the U-shaped piston rod 29 and to engage the cylinder 23 and one of the guide rods 25, these straps constituting guides for the rod 29 so as to hold it against displacement during the operation of the pump.

As shown in the drawings, the upper cylinder 18 is of much less diameter than the lower or main cylinder 23.

When the pump is not in use, the upper or secondary cylinder 18 is pushed downwardly in the guide 20 so as to be supported at one side of the main cylinder 23 and with piston 32 located in the upper portion of cylinder 18, while the piston 27 is located in the lower portion of cylinder 23.

lowerend within the socket 2 and discharges In using the pump the flexible tube 11 is attached to the tire to be inflated and the handle 28 is drawn upwardly in the usual manner. This will cause the piston 27 to move upwardly within the cylinder 23 and to charge the lower portion of the cylinder with air supplied through one or more openings in the head 22. At the same time the piston 32 will thrust upwardly against the cap 15 and cause the cylinder 18 to slide upwardly to the upper limit of its movement. During the reverse or downward stroke of the piston 27 the air in the path of said piston will be expelled through the passage 3 into the extension 4: and the pressure will be equalized within the tire and within the upper cylinder 18 by a portion of this air passing outwardly into the tube 11 and upwardly through the tube13. The

pressure will be retained in the tire and in the upper cylinder 18 by the check valves 9 and 7 respectively, the pressure thus maintained in the cylinder 18 serving to hold said cylinder in its elevated position. When the pistons are moved upwardly on the next stroke the lower portion of the cylinder 23 will be recharged while the piston 32 will move upwardly and expel the air in the upper portion of cylinder 18, causing this air to unseat the valve 9 and flow into the tire. During the next or down stroke of the pistons the air in the path of the piston 27 will again be directed into the extension and will first flow upwardly into the cylinder 18 where it will be compressed until the pressure of air within said cylinder 18 is equal to the pressure of air within the tire, whereupon an additional supply of air will be directed into the tire so that the pressure in the tire and the upper cylinder 18 will be equalized. This operation is continued during the reciprocation of the pistons and it has been found that a very eiiicient pump is produced because no leakage can take place through glands such as ordinarily provided in the path of air under pressure and because of the stored pressure constantly maintained within the cylinder 18. The cylinder 18 will always act as a cushion to receive excessive pressure and this pressure will subsequently be distributed to the tire if greater than that within the tire.

lVhen the pump is not in use, the supplemental cylinder can be pushed downwardly to the position shown in Fig. 1 so that the pump can thus be stored in a small space.

The straps 38 constitute eiiicient guides for the piston rod 29 and are ca able of sliding along the cylinder 23 anc one of the rods :25.

That is claimed is z- 1. A pump including a. main cylinder, a secondary cylinder slidably mounted at one side of and parallel with the main cylinder,

a flexible tubular connection between the outlet of the main cylinder and the inlet of the secondary cylinder, a piston mounted for reciprocation in the main cylinder, a piston mounted for reciprocation in the secondary cylinder, an actuating handle, a piston rod connecting the handle to the piston in the main cylinder, a U-shaped piston rod connecting the handle to the piston in the secondary cylinder, a valved outlet in communication with both cylinders, and a check valve interposed between said outlet'and the outlet of the main cylinder.

2. A pump includinga main cylinder having a valved outlet, at smaller secondary cylinder slidably mounted and parallel with the main cylinder, a connection between said valved outlet and the inletof the secondary cylinder, said connection including a flexible tubular portion, a valved outlet extending from said connection, a piston mounted within each cylinder, ahandle portion, and rods connecting said handle portion to the respective pistons to move the pistons in unison during theactuation of the handle portion. r

3. A pump including a main cylinder having a valvedout-let, a'smallersecondary cylinder slidably mounted and parallel with the main cylinder, a connection between said valved outlet and the inlet of the secondary cylinder, said connection including a flexible tubular portion, a valved outlet extending from said connection, apiston mounted within each cylinder, a handle portion, and rods connecting said handle portion to the respective pistons to move the pistons in unison during the actuationof the handle portion, saidpistons being oppositely disposed to successively expel'the' contents of their respective cylinders.

41. In a pump the combination with a base having a socket therein, and anoutlet extension in communication with the socket, there being a check valve within said extension, of a cylinder seated at one end in the socket and in communication with the outlet, a head on the cylinder and having a guide wing extending-therefrom, means for attaching the head tothe base, a secondary cylinder; mounted to slide within the-guide wing and having an outlet cap at itsupper end, a flexible tubular connection'between said cap and the tubular outlet of the first named cylinder, pistons mounted to reciprocate within the respective cylinders, means for moving said pistons in unison, and a valved outlet in communication with the outlet of the secondary cylinder.

5. The combination with a main cylinder having a valved outlet, a guide upon the main cylinder, and a secondary cylinder adapted to slide within t-heguide and having an outlet at its upper-end, of a flexible tubular connection between said outlets, a

valved outlet extending from said connection, a piston within each cylinder, a handle portion, and rods connecting said handle portion to the respective cylinders.

6. The combination with a main cylinder having a valved outlet, a guide upon the main cylinder, and a secondary cylinder adapted to slide within the guide and having an outlet at its upper end, of a flexible tubular connection between said outlets, a valved outlet extending from said connec tion, a piston within each cylinder, a handle portion, and rods connecting said handle portion to the respective cylinders, one of said rods being U-sliaped and movable along the outer side of the main cylinder.

7. The combination with a main cylinder having a valved outlet, a guide upon the main cylinder, and a secondary cylinder adapted to slide within the guide and having an outlet at its upper end, of a flexible tubular connection between said outlets, a valved outlet extending from said connection, a piston within each cylinder, a handle portion, rods connecting said handle portion to the respective cylinders, one of said rods being U-shaped and movable along the outer side of the main cylinder, and a guide slidably engaging the main cylinder and connected to the U-shaped rod.

In testimony that I claim the foregoing as my own, I have hereto affixed my signature in the presence of two witnesses.

JOHN K. TOMLINSON.

Witnesses:

IRY E. SIMPSON, PHILOMENA A. RooxELLI.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C.

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