US2309605A - Hydraulic tool fluid reservoir - Google Patents

Description

im. 26, i943 M LEE HYDRAULIC TooL FLUIDy RESERVOIR Filed July 3l, 1940 INVENTOR Wmv/N .55

Illini I r 1 f r r f r a l f l l n l,

ATTORNEY.

Patented Jan. 26, 1943 HYDRAULIC TOOL FLUID RESERVOIR Marvin Lee, Rye, N. Y., assignor to Burndy Engineering Company, Inc., a corporation of New York Application July 31, 1940, serial No. 349,023

(cl. zzo-ss) t 3 Claims.

This invention relates to uid reservoirs for use on hydraulically actuated mechanisms of the type illustrated in application filed August 13, 1938, Ser. No. 224,820 for a Portable hydraulic press, by Irving Frederick Matthysse.

Ordinarily a hydraulic tool which must be perated in any-position is equipped with a cylindrical iluid reservoir in which a follow-up pistonI fits snugly. This piston has packing placed about its diameter in order to seal it in the-cylindrical reservoir. The fit of the packing must be snug enough to prevent fluid or air leakage past the piston but at the same time, the piston must be able to move freely. As the fluid is pumped from the reservoir into the pressure chamber, atmospheric pressure forces the piston into the reservoir, taking up the space of the displaced oil. As a practical matter, however, atmospheric pressure is usually insufficient to overcome the friction of the packing against the cylinder walls and a follow-up spring is necessary/to assist in moving the follow-up piston forward. The action of this spring is to apply a constant force against the follow-up piston which in turn applies pressure against the hydraulic fluid even when the tool is not operating. As a consequence of constant pressure on the fluid, some of the fluid is forced past the piston packing in a slow leakage. This leakage is insignificant for short periods of time but for extended periods may be very detrimental and may ultimately cause the tool to become inoperative.

One object of my invention, therefore, is to permit the hydraulic mechanism to be operated in any position without danger of air getting into the hydraulic system.

Another object of my invention is to eliminate the so-called follow-up piston and packings.

Still another object of my invention is to provide an easy means of access to the hydraulic system so that fluid may be readily introduced therein without danger of air getting into the system.

A further object of myl invention is to protion, particularly pointed out in the attached vide all the foregoing advantages at low cost since it does not require the extremely'careful polishing and close tolerances that a cylindrical reservoir and follow-up piston require.

Another object is to eliminate friction and wear of moving parts, which ultimately may cause replacement of packings, refinishing of cylinder walls, etc.

I accomplish these and other objects and obtain my new results as will be apparent from claims, and illustrated in the accompanying drawing, in which:

Fig. 1A illustrates a side view of a form of hydraulic press.

Fig. 2 illustrates a sectional view of the reservoir or receptacle made of a rubber compound.

Fig. 3 illustrates a sectional view of the reservoir or receptacle having contracting metal Walls.

Referring more particularly to the drawing, reference numeral I 0 designates a portable press, illustrated in Fig. 1, with integral handle Il, pivoted lever I2, body I3, and a head I4, all

shown in cross section in co-pending application` Ser. No. 224,820.

Threadedly engaging the body I3 is the reservoir cap I5 within which is contained, as shown in Fig. 2, a flexible container, receptacle or sack I6, made of resilient materia1 preferably a rubber-like compound that can withstand oil, such as neoprene.

At the mouth of the sack, adjacent the orifices I1 and I8, a metal ring I9 is preferably molded integrally therewith. Thus the rim 20 of the `molded material which covers the inner and contact face of the ring, acts as a gasket when the sack is clamped to the body I3 by rotating the reservoir cap l5 thereon.

The'other end of the sack I6, is molded into a tubular section 2l, withmetal spout 22 integrally bonded or otherwise attached thereto, to form a sealed joint. 'This spout is used to fill the sack with hydraulic uid and is capped by a closure 23. The spout may be provided with at external side walls 24, for use with a wrench to insure a tight fit between spout and closure.

The integral handle I I is provided with threaded section 25, which .engages an internally threaded section 26 of the reservoir cap I5.

As the handle I2 is osclllated towards handle II in a scissors-like action, a piston, not shown,

p pumps the iiuidfrom the sack I6 into the pressure chamber not shown, through orice Il. If the overload is reached, or'the release valve of the press is actuated, as described in the copending application Ser. No'. 224,820, the iluid is returned to the reservoir I6 through oriflce I8.

'I'he follow-up effect of the piston previously used in the reservoir is thus obtained by the use of the collapsible rubber sack. preventingl air from entering the hydraulic system. .A similar effect may be obtained by the use of the to the body I3,

flexible metal bellows 30, shownin Fig. 3. Here the ring 3| is attached to the rim $2 of the bellows, and the reservoir cap I5 seals the bellows preventing leakage.

The remaining end of the bellows is formed into a tubular section 33, terminating in a closure 34.

As the oil is pumped from the bellows 30, the external air pressure causes the bellows to contract to take up -the loss in volume, and at the same time prevents the air from entering the oil chamber.

If sufllcient air does not leak in through the an inner collapsible chamber provided with an opening at one end thereof in communication threaded section of the handle Il, a small ap- A erture 35, may be provided, to permit the atmospheric pressure to operate the collapsible oil reservoir inside the reservoir cap l5.

In the operation of my invention, using a neoprene sack, I have caused the sack to be collapsed and refilled more than 5000 times without any sign of wear or deterioration.

I have thus described my invention, but I desire it understood that it is not conned to the particular forms or uses shown and described, the same being merely illustrative, Vand that the invention may be carried out in other ways without departing from the spirit of my invention, and, therefore, I claim broadly the right to employ all equivalent instrumentalities coming within the scope of the appended claims, and by means of which, objects of my invention are attained and new results accomplished, as it is obvious that the particular embodiments herein shown and described are only some of the many that can be employed to attain these objects and accomplish these resu1ts.

What I claim and desire to secure by Letters Patent, is as follows:

1. A container for attachment to a supporting structure having an orifice therein, comprising a rigid outer wall with an opening at one end thereof, and means for rigid attachment of the outer wall to the supporting structure with the orifice and the opening in communication, said outer wall provided with an aperture at the remaining end thereof; and an inner collapsible chamber provided with an opening at one end thereof in communication with the orifice of the supporting structure, the other end of said chamber having an aperture and closure therefor in communication with the aperture in the outer wall, that portion of the chamber containing the aperture and closure therefor being freely with the orifice of the supporting structure, said collapsible chamber being made of rubber. and having a metal ring bonded to said chamber about the opening thereof to permit the outer wall to compress the bonded metal ring to the supporting structure when the outer wall is threaded thereto, the other end of said chamber having an aperture and closure therefor in communication with the aperture in the outer wall,

Athat portion of the chamber containing the aperture and closure therefor being freely movable within the rigid outer wall whereby the chamber may be completely collapsed within the rigid outer wall under atmospheric pressure.

3. A container for attachment to a supporting structure having an orifice therein, comprising a rigid outer wall with an opening at one end thereof, and means for rigid attachment of the outer wall to the supporting structure with the orifice and the opening in communication, said outer wall provided with an aperture at the remaining end thereof; and an inner collapsible chamber provided with an opening at one end thereof in communication with the orice of the supporting structure, the other end of said chamber having an aperture and closure therefor in communication with the aperture in the outer wall, the aperture in the outer wall being provided with an extending hollow closure within which the closure for the aperture of the flexible chamber is freely movable, and providing access to the closure for the exiblechamber upon removal of the extending closure of the outer wall, that portion of the chamber containing the aperture and closure therefor being freely movable within the rigid outer wall and closure therefor whereby the chamber may be completely collapsed Within the rigid outer wall under atmospheric pressure.

MARVIN LEE.

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