US2955578A

US2955578A - Hydraulic ram

Info

Publication number: US2955578A
Application number: US715919A
Authority: US
Inventors: Clarence L Flessate; Jr Alex H Luedicke
Original assignee: Blackhawk Manufacturing Co
Current assignee: Blackhawk Manufacturing Co
Priority date: 1958-02-18
Filing date: 1958-02-18
Publication date: 1960-10-11
Anticipated expiration: 1977-10-11

Description

Cct. ll, 1960 c. L. FLEssArE ErAL 2,955,578

HYDRAULIC RAM Filed Feb. 18, i958 Ilm / za v INVENTORS j. ,f

United States Patent- HYDRAULIC RAM Clarence L. Flessate, Waukesha, and Alex H. Luedicke, VJr., .Wauwatosa, Wis., assignors to Blackhawk Mfg. CosWest Allis, Wis., a corporation of Wisconsin Filed Feb. 1s, 195s,1ser. No. 715,919 's claims. (Cl. 121-46) This invention relates .to portable hydraulic power packages which may Ibe used as jacks, pullers, presses or the like.

Prior art device of this general nature have been rather diicult to disassemble -for repair and maintainence purposes becauseof their numerous seals and other parts. They have also `been rather limited as to the variety of purposes yfor which` they may be used. Tools of this type must alsobe'capable of being produced economically and belexceptionally sturdy. 1

In accordance with the present invention a hydraulic power package has ybeen provided which is particularly simple in construction and economical to manufacture. A relatively few number of parts is required, which parts are readily assembled and disassembled.

The invention further contemplates a hydraulic tool of the above type which can quickly be converted so as to be used with a variety of other tools and for various purposes.

It is generally an object of this invention to provide an improved hydraulic jack of the above type.

These and other objects and advantages will appear hereinafter as this disclosure progresses, reference being had to the accompanying drawings in which;

Figure '1 is a perspective view of a hydraulic power package made in accordance with the invention and showing one type of saddle removed therefrom;

Figure 2 is a perspective view of two other types of saddles useable with the device shown in Figure 1;

Figure 3 is a cross-sectional view of the hydraulic tool shown in Figure 1, kbut on an enlarged scale, and showing the tool in the contracted position, and

Figure 4 is a view similar to Figure 3 but shows the tool in the partially extended position and with a draw rod extending therethrough for a pulling operation.

Referring in greater detail to the drawings, a cylinder 6 has a bore 7 in its head end and a larger bore 8 extending from its other end. Bore 8 terminates in a tapered bottom or shoulder 9 which connects the

bores

7 and 8. An internal thread 10 is formed i'n the outer end of bore 8. A iiuid passageway 11 is drilled radially into the cylinder and terminates in the tapered or inclined bottom 9 so as to place the liluicl supply conduit 12 in communication with the inside of the cylinder. The ram body 6 so formed is made from solid steel stock for exceptional strength and long life.

A plunger guide 13 is inserted in bore 7 and extends a distance into the cylinder. The guide and cylinder are silver-soldered together, as at 14, and together form an annular chamber 15 in which the plunger 16 reciprocates.

The guide 13 has a bore 17 extending axially therethrough which receives various tools therein, such as the draw rod 18 shown in Figure 4. A reinforcing plate 19 is mounted on the rod 18 and a nut 20 is threadably engaged on -the end of the rod. j

The plunger 16 has a packing 22 in its periphery which seals between the cylinder bore 8 and the plunger. An other packing 23 is located in the bore 24 of the plunger Y the ring. j The spring 33 acts between the stop ring and plunger Thesaddle 38 shown in forms a close sliding iit with the plunger guide sleeve 13.,

The plunger also has an intermediate portion 26 and an end portion 27 which are joined by shoulder Z8.

1 Al stop ring 30 is threadably engaged in the end of the Y cylinder and has an opening 31 in which plunger portion 2 7 is adapted to reciprocate. Shoulder 28 abuts against the inner surface of the stop ring when the unit is fully extended. A series of apertures 32 are provided in the outer surface of the ring to receive a tool for removing and urges V.the plunger toward the retracted position. The spring'is fullyl enclosed for protection against damage and dirt.

The outer end of the plunger has an internal thread i which isV adapted to receive various saddles for different operations. The saddle 36 shown in Figures 1 and 4 is of the smooth hollow type which Vwould be used as illustrated in Figure 4 with a Shaft 18 and keeper'nut 20.l Figure 2 has an internal threadv 39,which receives a threaded shaft such as an adjusting screw, for pulling applications,` unit to production jigs and xtures. The saddle 40 is of the solid serrated type which converts the power package into a remote-controlled jack for versatile jacking application. These interchangeable saddles make this hydraulic unit particularly versatile and capable of multiple uses.

The hydraulic unit has been shown in Figure 4 as applied when pulling a pin 42 out from two

members

43, 44. The end of rod 18 is threaded and is engaged in the internal threaded portion of the pin.

Pressure fluid is supplied via conduit 12 to the cylinder to move the plunger relative thereto. When used as shown in Figure 4, the cylinder is moved away from the

members

43, 44 and pulls pin 42 along with it through rod 18.

When pressure fluid is released completely from the cylinder the spring 33 causes the plunger to be retracted into the cylinder. Because the passageway 11 opens into the tapered bottom 9 and the surface 34 is straight, that is, normal to its axis, even if the plunger is fully retracted the plunger will never seat against the opening 11 and prevent the ingress of fluid into the cylinder. As a result, when pressure uid is initially introduced into opening 11, there will be a working area in the end of the cylinder for fluid to flow into and act against the plunger to cause immediate movement thereof. Positive actuation of the unit is thereby assured for any position of the plunger.

To disassemble the unit it is only necessary to remove the stop ring 30. The spring 33 and plunger can then be easily withdrawn.

Various modes of carrying out the invention are contemplated as being within the scope of the following claims particularly pointing out and distinctly claiming the subject matter which is regarded as the invention.

We claim:

1. A portable hydraulic power package comprising, a one piece cylinder having a bore in one of its ends and a larger bore in the other of its ends, a tapered shoulder connecting said bores so as to define a head end of said cylinder, a fluid supply passageway extending from said shoulder to the exterior of said cylinder, a plunger guide sleeve sealingly secured in said smaller bore and terminating within said larger bore, a stop ring threadably engaged in said other end of said cylinder and having an aperture therethrough, said ring having means for removal of the same from said cylinder from the outside thereof, and a piston plunger reciprocatin'gly mounted on Patented Oct. l1, 1,960

between the guide `and the press uses or to adapt the,

said sleeve and sealingly engaging said sleeve and said cylinder, said plunger having Ya reduced end portion reciprocable in said stop ring aperture and extensible from said cylinder and also having a shoulder dening the end of said reduced portion and cooperable with said stop ring to limit outward movement of said plunger.

2. A portable hydraulic power package comprising, a one piece cylinder having a bore extending through its head end and a larger bore extending through its other end, va tapered shoulder connecting said bores, a uid supply passageway extending from said shoulder to the exterior of said cylinder, a plunger guide sleeve extending through said smaller bore and having an inner end terminating within said larger bore and also having an outer end sealingly secured to said head end of said cylinder, a stop ring threadably lengaged in the other end of said cylinder and having an aperture therethrough, said ring having means for removal from said cylinder from the outside thereof, a plunger reciprocatingly mounted on said sleeve and having a piston portion at one end s'lidably and sealingly engaging said sleeve and said cylinder, said plunger having a reduced portion at its other end reciprocable in said stop ring aperture and extensible from said cylinder and said reduced portion terminating in a shoulder cooperable with said stop ring to limit outward movement of said plunger, -and a spring surrounding said plunger and interposed between the piston portion thereof and said stop ring for constantly urging said plunger toward the end head of said cylinder.

3. A portable hydraulic power package comprising, a one-piece cylinder having a bore in one of its ends and a larger bore in the other of its ends, a tapered shoulder connecting said bores so as to deine a head end of said cylinder, a uid supply passageway extending from said shoulder to the exterior of said cylinder, a plunger guide sleeve sealingly secured in said smaller bore and terminat-k with said'stop ring to limit outward movementV of said plunger.

References Cited in the tile of this patent UNITED STATES PATENTS 2,356,899' Stutter Aug. 29, 1944 2,393,410 Pine Jan. 22, 1946 2,475,040 Mandl July 5, 1949 2,631,480 Romine et al. Mar. 17, 1953