US2981131A

US2981131A - Hydraulic pipe vise

Info

Publication number: US2981131A
Application number: US846695A
Authority: US
Inventors: Malcolm E Mitchell
Original assignee: Individual
Current assignee: Individual
Priority date: 1959-10-15
Filing date: 1959-10-15
Publication date: 1961-04-25
Anticipated expiration: 1978-04-25

Description

April 25, 1961 M. E. MITCHELL 2,981,131

HYDRAULIC PIPE VISE Filed Oct. 15, 1959 2 Sheets-Sheet 1 IN VEN TOR.

M91. COLM EMTCHEL L April 25, 1961 M. E. MITCHELL HYDRAULIC PIPE VISE Filed Oct. 15, 1959 2 Sheets-Sheet 2 INVENTOR.

[ l/71.00441 1 MTCHELL e i 2,981,13t Patented. Apr. 25, 19.61

United States Patent HYDRAULIC PIPE VISE MalcolmEaMitchell, 120 E. 109thPlace,

Los Angeles, Calif.

Filed Oct-1.5, 1959, Ser. No. 846,695

8jClain1s. (Cl 81.-17.2)

I'his inventionrelatesto avise and is more-particularly concerned with a portable hydraulically operated pipe vise. In all pipe fitting and plumbing operations and installations, it is necessarythat pipe be cut and. otherwise workedupon. Itis necessary inmany such situations that the pipe be held securely in a suitable vise.

It is commonpractice for pipe fitters, plumbers and the like, to cut and prefabricate as much of an installation as possible, at a shop, where suitable and/or adequatafast easy to operate VlSfiS are; available and to transport the prefabricated portions of the installations to the job site and tothereafter install it.

While small manually operated pipe vises arefrequently-available at the jobsites, workmen of the class referred to generally avoid using them. as much as possible, since they areslowand difficult to operate-and-aregenerally not sufiiciently strong andssturdy toafiord the sup port desired.

An object of my inventionis to providea unitary pipe vise that can beadvantageously transported from, one placeto another with a minimum of effort.

It is an object of my invention to provide a novel manually operated, hydraulically actuated pipe vise which is such that it can advantageously accommodate pipes of varying size and such that it can-exert great pressure thereon.

A further object of my invention is to provide a vise of, the character referred to which is fastvand which requires little or no skill to operate.

It is a feature ofmy-inventiontto provide. a-viseof the character referred to having. arigidframe, a-'fixed jaw on the frame, a movable, jaw'pivotally-carriedby the frame and a hydraulic cylinder andpiston unit carried by the frameto oppose the fixed jaw andcoupled with the movable jaw.

Another feature of my inventionis to provide. a vise of the character referred to having a manually operated hydraulic pump to deliver fluidto the cylinderand piston unit and a manually operable means for shifting; the movable jaw relative to thefi-xedjaw and into and out of engagement with a pipe engaged in the fixed jaw.-

Still another. feature of my inventionis to provide a manually operable valve meansto control the flow; of fluid to and from the cylinder and piston unit.

An object of this invention is to provide, a vise construction of the character referred to which is .easy and economical to manufacture and which is both highlyeffective and dependable in operation.

The various objects and features of my invention will be fully understood from the following detailed description of a typical preferred form and application of my invention, throughout which description reference is made to the accompanying drawings, in which:

Fig. 1 is a side view of my new vise constructionshowing certain parts in section.

Fig. 2* is a front view-of rny new construction, with partsthereof in section.-

Fig. 3 is an enlarged detailed sectional view of a portion of the structure shown in Fig. 1.

Fig. 4 is a sectional view taken as indicated by line 4-4 on Fig. 2.

The vise construction that I provide involves generally, a frame A, a fixed jaw B carried by the frame, a movable jaw C, support means D for thejaw C, a hydraulic cylinder and piston unit E carried by the frame and operatively connected with the movable jaw C, a fluid reservoir R carried by the frame, a manually operable valve means V controlling the flow of fluid into and out of the cylinder and piston unit, manually operable. pump means P related to the reservoir and the valve means to urge fluid into the said unit, fluid retaining means F between valve means and the reservoir, and manually operable shifting means G adapted to urge the jaw C into and out of engagement with a pipe P engaged in the jaw B, preparatory or subsequent to operation of the means V and P,

The frame A that I provide includes an elongate, horizontally disposed base 10 having front and rear ends, an elongate horizontally disposed header 11 having front and rear ends spaced above the base 10, a pair of laterally spaced vertically disposed rear standards 12 fixed to and extending between the rear ends of the base and header 10 and 11 and a pair of laterally spaced vertically disposed front standards 13 fixed to and extending between the base and the header and spaced rearward of the front ends thereof.

The base ltlfis' shown established from a length 'of channel iron, arranged in'an inverted position so as to establish a flat top surface 14.

The header 11 is formed of a simple length of strap steel or bar stock, and the

standards

12 and 13 are formed of angle iron stock.

In addition to the foregoing, the frame A can, as illustrated, be provided with vertically spaced, horizontally disposed, reinforcing spreaders 15 to extend between the

standards

12 and 13, and spacers 16 to extend between the adjacent standards.

In practice, the several parts going to make up the frame A are suitably secured together in fixed relationship as by welding.

The fixed jaw B is a simple, cast block having a fiat bottom 17 to seat on the top 14 of the base 10, vertical sides 18 and a top having two downwardly convergent wickered surfaces defining a pipe receiving trough. The

jaw is arranged on the top 14 of the base, forward of thefront standards 13 and so the trough extends transversely of the base.

The jaw B is releasably secured to the base by a pair of cleats 19 arranged at opposite sides of the jaw to engage outwardly projecting bosses 20 provided on the adjacent sides of the jaw, and bolt fasteners 21 carried by the cleats and engaged in the base.

The movable jaw C includes an elongate, horizontally disposed body 22 having a downwardly opening, longitudinal groove 23 in its bottom side and an upwardly projecting, block-like boss 24 with a longitudinally disposed, transverse opening on its upper side. A pair of elongate blades 25 are arranged in the groove 23 to extend longitudinally thereof and to project downwardly therefrom.

The blades 25 are provided with inclined bottom sides 26 defining laterally spaced, longitudinally disposed pipe engaging edges 27 and which are arranged to converge upwardly relative to each other and define a downwardly opening pipe receiving channel.

The jaw C is arranged to occur above and oppose the fixed jaw B.

The support means D for the jaw C includes aninverted, U-shaped yoke 28"having a top body 29 and a pair of laterally space d depending legs 30. The legs 30 occur at opposite sides of the boss 24 on the jaw C and are pivotally connected therewith by means of a pivot pin 31 engaged through the legs and through the opening in the boss. The pin is provided with suitable lock nuts 32 at its opposite end to prevent its displacement.

' The means D further includes an elongate carrier arm 33 having a front end engaged between the legs 30 of the yoke 28, above the jaw, by means of a pivot pin 34.

lateral shifting and displacement of the jaw C, relative to the jaw B and base A.

The cylinder and piston unit E includes an elongate, substantially vertically disposed cylinder sleeve 36, a head 37 at and closing its upper end and a head 38 at and closing its lower end. The upper and

lower heads

37 and 38 have cylindrical projections 39 to enter the adjacent ends of the sleeve 36 to maintain the heads properly oriented. The projections 39 are provided with suitable O-rings 40 to establish a suitable fluid seal between the heads and the cylinder sleeve.

The

heads

37 and 38 are held in tight clamped engagement with the sleeve 36 by a plurality of tie bolts 41.

A disc-shaped piston 42 carrying an O-ring seal 43 is engaged in the cylinder sleeve 36 and is connected with a piston rod 44 which depends therefrom, through an opening provided in the lower cylinder head 38, and to a point where it connects with the yoke 28 of the means D. a

In the case illustrated, the lower end of the rod is threadedly engaged in an opening provided in the body of the yoke and carries a suitable lock nut 45 to engage the said body and to normally prevent disengagement of the rod therefrom.

The upper head 37 of the unit E is a cast part having a lower portion which engages the cylinder sleeve and is provided with the projection 39, referred to above, a central body portion establishing a body 46 for the valve ieans V, as will hereinafter be described and a top portion 47 in the nature of a clevis and adapted to receive the forward end of the header 11. The top portion or clevis 47 is pivotally secured to the header 11 by means of a suitable pivot pin 47.

The central body portion 46 of the head 37 has a forwardly opening bore in which a cylindrical valve plug 48 is engaged, an inlet port 49 entering the body from one side and communicating with the bore and an outlet port 50 entering the body from the other side and communicating with the bore, and a central vertical flow port 51 establishing communication between the interior of the cylinder and the bore. The plug 48 is inder head 38 by screw fasteners 57 and having an elongate forwardly and upwardly opening channel 58. An elongate rack 59 slidably engaged in the channel, a shaft 60 rotatably carried by the block, above the rack, to extend transversely of the channel and carrying a pinion 61 to engage the channel, an elongate operating lever 62 suitably secured to one side of the pinion to project forwardly and upwardly therefrom and provided with a hand engaging knob 63 at its outer terminal end, an elongate cylinder 64 threadedly engaged in an opening 65 in the rear end of the block and in axial alignment with the channel and the rack, a ram 66 carried by the rack to project rearwardly therefrom and slidably engaged in the cylinder, a nipple 67 threadedly engaged in the rear end of the cylinder and a suitable flow control means 68 connected with the nipple.

The flow control means 68 and shown in detail in Fig. 3 of the drawings, is a fabricated unit made up of three

body sections

70,71 and 72'ar'ranged in vertical stacked relationship and'clamped together by means of end plates 73 and the bolt 73'. The lower section 70 has a central inlet opening 74 and an upwardly disposed valve seat 75 concentric with the opening and adapted to cooperatively receive an inlet ball check 76. The central section 71 has a central bore 77, a downwardly opening socket 78 concentric with the bore to oppose the section 70 and freely accommodate the ball check, a lateral port 79 communieating with the socket and threadedly receiving the nipple 67 and an upwardly disposed annular valve seat 80 at its top, concentric with the bore and adapted to cooperatively receive an outlet ball check 81. The upper section 72 has a central outlet opening 82 entering it from the top 'and a downwardly opening socket 83 concentric with the provided with a flow passage 52 with ends opening at 90 about the periphery of the plug and adapted to be selectively positioned, upon rotation of the plug through 90, to establish communication between the inlet port and the flow port, and between the outlet port and the flow port.

The plug can be retained in proper working position and against displacement from the bore and can be suitably sealed therein in any desired manner and is provided with a forwardly projecting operating 'stem '53 carrying an operating lever arm 54. The stem 53 can, as illustrated, be provided with a suitable stop pin 55, or the like, to engage a part of the head 37tand stop the plug in predetermined rotative positions where the ports in the body and the head are in register with each other.

.The manually operable pump means P that I provide includes a cast guide block 56secured to the lower cylopening 82 and freely receiving the ball check 81.

The

sockets

78 and 83 are provided with suitable stop pins 84 to limit upwardly movement of the ball checks 76 and 81.

Suitable seals 85 are provided between the

sections

70, 71 and 72 to prevent the escape of fluid therebetween.

The inlet opening 74 of the means 68 threadedly receives the end of a flow pipe 86 extending to and communicating with the reservoir R.

The outlet opening 82 of the means 68 threadedly receives an end of a delivery pipe 87 which extends to and is. engaged in the inlet port 49 of the valve means V.

With the pump means P set forth above and illustrated in the drawings, it will be apparent that when the ram 66 is reciproeated in the cylinder 64 by means of the rack and pinion drive, fluid is drawn from the reservoir R through the flow pipe 86 and into the means 68 and the cylinder 64 is urged under pressure from the cylinder and the means .68, through the delivery pipe 87 to the valve means V whereupon it is directed into the cylinder 36, to urge the piston 42 and the movable jaw 22, operatively related thereto, downwardly.

The reservoir R is a simple, vertically disposed cylindrical tank and is provided at its bottom with a,T-fitting 88 to connect with a return pipe 89 of the return means F. The reservoir is supported by the pipes 86 and 89 through the T-fittin'g 88 and is free to pivot or swing with the cylinder and piston unit. 7

In practice, flexible conduits could be used in place of the several pipes mentioned, in which case the reservoir R would be fixed to and supported by the frame A.

The means F is adapted to provide for free fiow of fluid from the cylinder and piston unit E into the reservoir R, when it is desired to raise the jaw C and when the valve 'means V is shifted to a position where communication is established between the ports 50 and 51 thereof.

The means F involves the single return pipe 89 which extends from the T-fitting on the reservoir, to the outlet port 50 of the valve means V.

In practice, a suitable gauge 90 can be provided in the delivery line 87 so that the operator can easily and conveniently determine the pressure being generated and exerted onto the pipe P. y

The manually operable shifting means G that I provide is adapted to shift the jaw C vertically into and out of engagement with the pipe P', preparatory to or subsequent to operatingof the means E and P.

The means G is shown as including a projection 91 with a vertical guide opening 92 at the rear of the lower head 38 of the cylinder and piston unit, a rearwardly extending projection 93 on the body 29 of the yoke 28 of the means D to occur below the projection 91, an elongate, vertically disposed rack 94 fixed to and projecting upwardly from the projection 93 and slidably engagedin the opening 92 in the projection 91, a shaft 95 extending transversely through the projection 91 and the opening 92 therein and rotatably carried by the said projection, a pinion 96 on the shaft, to occur within the opening and meshed with the rack and an elongate lever arm 97, at one end of the shaft, outward of the projection 91 and provided with a hand knob 98 at its outer terminal end.

With the means G set forth above, and when the valve means V is in a position to allow for the free flow of fluid into and out of the cylinder and piston unit E, through the return means F, the operator of my new vise can easily and quickly-raise or lower the jaw C out of or into engagement with the pipe P by simply urging the lever arm 97 one way or the other as circumstances require. l Q

When it is desired toclamp the pipe P tight in the vise, the jaw C is first urged into engagement with the pipe P by the means G, the valve means V is next shifted to its other position, where communication is established between the unit E and the pump means P, then the pump means is actuated to urge fluid under pressure into the unit E, by means of the lever arm 62 thereof and until the desired gripping or clamping pressure is attained.

It is to be noted that the fluid system of my construction is fully charged at all times. As a result of the fully charged condition of the fluid system, and when the jaw C is initially engaged with the pipe by the means G, very little fluid need be moved by the pump means P into the unit E to create ample holding or clamping pressure on the pipe. It has been found that urging the lever arm 62 through approximately 45 results in adequate clamping pressure on the pipe.

From the foregoing, it will be apparent that I have invented a simple, practical, highly effective and dependable hydraulically operated pipe vise and a vise construction which is such that it can be easily and conveniently transported and such that it requires no special training or skill to operate,

Having described only a typical preferred form and application of my invention, I do not wish to be limited or restricted to the specificdetails herein set forth, but

.wish to reserve to myself any modifications or variations that may appear to those skilled in the art and fall within the scope of the following claims.

Having described my invention, I claim:

1. A ise 'of the character referred to including, a

frame havinglan elongate, horizontally disposed base with front and rear ends, a pair of laterally spaced vertically disposed standards at the rear end of the base, a second pair of laterally spaced, vertically disposed standards at the central portion of the base, an elongate, horizontally disposed header fixed to the upper ends of the pairs of standards and overlying the base, a fixed jaw secured to the forward portion of the base and having an upwardly .L'ope'ning pipe receiving trough extending transversely of the base, an elongate arm having an end pivotally supported between the pair of standards at the rear of the base and projecting forwardly between the second pair of standards to be guided thereby, a movable jaw spaced above and opposing the fixed jaw, a yoke pivotally carried by the arm and pivotally connected with themovable jaw on axes extending transversely of the base, a cylinder against i 6 and piston unit including a cylinder sleeve with upper and lower heads, a piston in the sleeve, a rod on the piston projecting through the lower head and connected with the yoke, said upper head having a clevis thereon and pivotally connected to the header, a fluid reservoir, manually operable pump means connected with and receiving fluid from the reservoir and connected with the upper head of the cylinder and piston unit to deliver fluid into the cylinder under pressure, a return pipe extending from the upper cylinder head to the reservoir, manually operable valve means in the upper cylinder head and operable to selectively establish communication between the cylinder and pump means and between the cylinder and the return pipe, and manually operable shifting means operable to shift the movable jaw into and out of engagement with a pipe engaged in the fixed jaw preparatory to or subsequent to operation of the pump means.

2. A vise of the character referred to including, a frame having an elongate, horizontally disposed base with front and rear ends, a pair of laterally spaced vertically disposed standards at the rear end of the base, a second pair of laterally spaced, vertically disposed standards at the central portion of the base, an elongate, horizontally disposed header fixed to the upper ends of the pairs of standards and overlying the base, a fixed jaw secured to the forward portion of the base and having an upwardly opening pipe receiving trough extending transversely of the base, an elongate arm having an end pivotally supported between the pair of standards at the rear of the base and projecting forwardly between the second pair of standards to be guided thereby, a movable jaw spaced aboveand opposing the fixed jaw, a yoke pivotally carried by the arm and pivotally connected with the movable jaw on axes extending transversely of the base, a cylinder and piston unit including a cylinder sleeve with upper and lower heads, a piston in the sleeve, a rod on the piston projecting through the lower head and connected with the yoke, said upper head having a clevis thereon and pivotally connected to the header, a fluid reservoir, manually operable pump means connected with and receiving fluid from the reservoir and connected with the upper head of the cylinder and piston unit to deliver fluid into the cylinder under pressure, a return pipe exand connected with a delivery pipe extending from the reservoir, a flow port establishing communication between the bore and the cylinder sleeve, a valve plug rotatably engaged in the bore and having a port therein to be selectively positioned to establish communication between the flow port and the inlet port and between the flow port and the outlet port and an operating lever arm carried by the plug at the exterior of the bore.

3. A vise of the character referred to including, a frame having an elongate, horizontally disposed base with front and rear ends, a pair of laterally spaced vertically disposed standards at the rear end of the base, a second pair of laterally spaced, vertically disposed, standards at the central portion of the base, a horizontally disposed header fixed to the standards and overlying the base, a fixed jaw on the base, an elongate arm pivotally supported by the standards between the base and the header, a movable jaw pivotally carried by the arm and opposing the fixed jaw, a reservoir, a vertically disposed cylinder and piston unit fixed to and extending between the header and the arm, manually operable pump means connected with the upper end of the cylinder and piston unit to deliver fluid into the cylinder under pressure, a return .assntat pipe extending from the upper end of the said unit to the reservoir, manually operable valve means at the upper end of the unit and operable to selectively establish communication between the unit and pump means and between the unit and the return pipe, and manually operable shifting means operable to shift the movable jaw into and out of engagement with a pipe engaged in the fixed jaw preparatory to or subsequentto operation of the pump means, said pump means including a guide block fixed to the lower end of the unit, a cylinder and ram carried ,by the block, a manually operable rack and pinion drive means carried by the block and coupled with the ram and a flow control means having a check valve controlled inlet port connected with a flow pipe extending from the reservoir, a check valve controlled outlet port connected with the valve means by a delivery pipe and a flow port intermediate the inlet and outlet portsand connected with the cylinder of the pumpmeans.

' 4. A vise of the character referred to including, a frame having an elongate, horizontally disposed base with front and rear ends, a pair of laterally spaced verticallytdisposed standards at the rear end of the base, a second pair of laterally spaced, vertically disposed standards at the central portion of the base, an elongate, horizontally disposed header fixedto the upper ends of the pairs of standards and overlying the base, a fixed jaw secured to the forward portion of the base and having an upwardly opening pipe receiving trough extending transversely of the base, an elongate arm having an end pivotally supported between the pair of standards at the .rear of the base and projecting forwardly between the second pair of standards to, beguided thereby, a movable jaw spaced above and opposing the fixed jaw, a yoke pivotally carried by the arm and pivotally connected with the movable jaw on axes extending transversely of the base, a cylinder and piston unit including a cylinder sleeve with upper and lower heads, a piston in the sleeve, a rod on the piston projecting through the lower head and connected with the yoke, said upper head having a clevis thereon and pivotally connected to the header, a fluid reservoir, manually operable pump means connected with and receiving fluid from the reservoir and connected with the upper head of the cylinder and piston unit to deliver fluid into the cylinder under pressure, a return pipe extending from the upper cylinder head to the reservoir, manually operable valve means in the upper cylinder head and operable to selectively establish communication between the cylinder and pump means and between the cylinder and the return pipe, and manually operable shifting means operable to shift the movable jaw into and out of engagement with a pipe engaged in the fixed jaw preparatory to or subsequent to operation of the pump means, said valve means including a bore in the head, an inlet port in the head communicating with the bore and connected with a delivery pipe extending from the reservoir, a flow port establishing communication between the bore and the cylinder sleeve a valve plug rotatably engaged in the bore and having a port therein to be selectively positioned to establish communication between the flow port andthe inlet port and between the flow port and the outlet port and an operating lever arm carried by the plug at the exterior of the bore, said pump means including a guide 'block fixed to the lower cylinder head, a cylinder and ram carried by the block, a manually operable rack and pinion drive means carried by the block and coupled with the ram and a flow control valve means having a check valve controlled inlet port connected with a flow pipe extending from the reservoir, a check valve controlled outlet port connected with the valve means in the cylinder head by a delivery pipe and a flow port intermediate the inlet and outlet portsand connected with the cylinder of the pump means. 1

5. A vise of the character referred to including, a vframe having 'an elongate, horizontally disposed base with front and rear ends, a pair of laterally spaced vertically disposed standards at the rear end of the base, a second pair of laterally spaced, vertically disposed standards at the central portion of the base, anelongate, horizontally disposed header fixed to the upper ends of the pairs of standards and overlying the base, a fixed jaw secured to the forward portion of the base and having an upwardly opening pipe receiving trough extending transversely of the base, an elongate arm having an end pivotally supported between the pair of standards at the rear of the base and projecting forwardly between the second pair of standards to be guided thereby, a movable jaw spaced above andopposing the fixed jaw, a yoke pivotally carried by the arm and pivotally connectedwith the movable jaw 'on axes extendin'g transversely of the base, a cylinder and piston'unit including a cylinder sleeve with upper and lower heads, a piston in the sleeve, a rod on the piston projecting through the lower head and connected with the yoke, said upper head having a clevis thereon and pivotally connected to the header, a fluid reservoir, manually operable pump means connected with and receiving fluid from the reservoir and connected with the upper head of the cylinder and piston unit to deliver fluid into the cylinder under pressure, a return pipe extending from the upper cylinder head to the reservoir, manually operable pump means connected with and receiving fluid from the reservoir and connected with the upper head of the cylinder and piston unit to deliver fluid into the cylinder under pressure, a return pipe extending from the upper cylinder head to the reservoir, manually operable valve means in the upper cylinder head and operable to selectively establish communication between the cylinder and pump means and between the cylinder and the return pipe, and manually operable shifting means operable to shift the movable jaw into and out of engagement with a pipe engaged in the fixed jaw preparatory to or subsequent to operation of the pump means, said shifting means including an elongate rack fixed to the yoke to extend parallel with the cylinder and piston unit, a pinion rotatably carried by the lower piston head and meshed with the rack and an operating lever connected with the pinion.

6. A vise of the character referred to including, a frame having an elongate, horizontally disposed base with front and rear ends, a pair of laterally spaced vertically disposed standards at the rear end of the base, a second pair of laterally spaced, vertically disposed standards at the central portion of the base, an elongate, horizontally disposed hcader fixed to the upper ends of the pairs of standards and overlying the base, a fixed jaw secured to the forward portion of the base and having an upwardly openaxes extending transversely of the base, a cylinder and piston unit including a cylinder sleeve with upper and lower heads, a piston in the sleeve, a rod on the piston projecting through the lower head and connected with the yoke, said upper head having a clevis thereon and pivotally connected to the header, a fluid reservoir,'manually operable pump means connected with and receiving fluid from the reservoir and connected with the upper head of the cylinder and piston unit to deliver fluid into the cylinder under pressure, a return pipe extending from the upper cylinder head to the reservoir, manually operable valve means in the upper cylinder head and operable toselectively establish communication between the cylinder and pump means and between the'cylirider and the return pipe, and manually operable shifting means operable to shift the movable jaw into and out of engagement with a pipe engaged in the fixed jaw preparatory to or subsequent to operation of the pump means, said valve means including a bore in the head, an inlet port in the head communicating with the bore and connected with a delivery pipe extending from the reservoir, a flow port establishing communication between the bore and the cylinder sleeve, a valve plug rotatably engaged in the bore and having a port therein to be selectively positioned to establish communication between the flow port and the inlet port and between the flow port and the outlet port and an operating lever arm carried by the plug at the exterior of the bore, said shifting means including an elongate rack fixed to the yoke to extend parallel with the cylinder and piston unit, a pinion rotatably carried by the lower piston head and meshed with the rack and an operating lever connected with the pinion.

7. A vise of the character referred to including, a frame having an elongate, horizontally disposed base with front and rear ends, a pair of laterally spaced vertically disposed standards at the rear end of the base, a second pair of laterally spaced, vertically disposed standards at the central portion of the base, a reservoir, a horizontally disposed header fixed to the upper ends of the standards and overlying the base, an elongate arm pivotally carried by the standards between the base and the header, a fixed jaw carried by the base, a movable jaw pivotally carried by the arm and opposing the fixed jaw, a cylinder and piston unit fixed to and extending between the header and the arm, said unit having upper and lower heads, manually operable pump means connected with the upper head of the cylinder and piston unit to deliver fluid into the unit under pressure, a return pipe extending from the upper cylinder head to the reservoir, manually operable valve means in the upper head and operable to selectively establish communication between the cylinder and pump means and between the unit and the return pipe, and manually operable shifting means operable to shift the movable jaw into and out of engagement with a pipe engaged in the fixed jaw preparatory to or subsequent to operation of the pump means, said pump means including a guide block fixed to the lower cylinder head, a cylinder and ram carried by the block, a manually operable rack and pinion drive means carried by the block and coupled with the ram and a flow control valve means having a check valve controlled inlet port connected with a flow pipe extending from the reservoir, a check valve controlled outlet port connected with the valve means in the cylinder head by a delivery pipe and a flow port intermediate the inlet and outlet ports and connected with the cylinder of the pump means, said shifting means including an elongate rack fixed to the yoke to extend parallel with the cylinder and piston unit, a pinion rotatably'carried by the lower piston head and meshed with the rack and an operating lever connected with the pinion.

8. A vise of the character referred to including, a frame having an elongate, horizontally disposed base with front and rear ends, a pair of laterally spaced vertically disposed standards at the rear end of the base, a second pair of laterally spaced, vertically disposed standards at the central portion of the base, an elongate, horizontally dis- 10 posed header fixed to the upper ends of the pairs of standards and overlying the base, a fixed jaw secured to the forward portion of the base and having an upwardly open ing pipe receiving trough extending transversely of the base, an elongate arm having an end pivotally supported between the pair of standards at the rear of the base and projecting forwardly between the second pair of standards to be guided thereby, a movable jaw spaced above and opposing the fixed jaw, a yoke pivotally carried by the arm and pivotally connected with the movable jaw on axes extending transversely of the base, a cylinder and piston unit including a cylinder sleeve with upper and lower heads, a piston in the sleeve, a rod on the piston projecting through the lower head and connected with the yoke, said upper head having a clevis thereon and pivotally connected to the header, a fluid reservoir, manually operable pump means connected with and receiving fluid from the reservoir and connected with the upper head of the cylinder and piston unit to deliver fluid into the cylinder under pressure, a return pipe extending from the upper cylinder head to the reservoir, manually operable valve means in the upper cylinder head and operable to selectively establish communication between the cylinder and pump means and between the cylinder and the return pipe, and manually operable shifting means operable to shift the movable jaw into and out of engagement with a pipe engaged in the fixed jaw preparatory to or subsequent to operation of the pump means, said valve means including a bore in the head, an inlet port in the head communicating with the bore and connected with a delivery pipe extending from the reservoir, a flow port establishing communication between the bore and the cylinder sleeve, a valve plug rotatably engaged in the bore and having a port therein to be selectively positioned to establish communication between the fiow port and the inlet port and between the flow port and the outlet port and an operating lever arm carried by the plug at the exterior of the bore, said pump means including a guide block fixed to the lower cylinder head, a cylinder and ram carried by the block, a manually operable rack and pinion drive means carried by the block and coupled with the ram and V a flow control valve means having a check valve controlled inlet port connected with a flow pipe extending from the reservoir, a check valve controlled outlet port connected with the valve means in the cylinder head by a delivery pipe and a flow port intermediate the inlet and outlet ports and connected with the cylinder of the pump means, said shifting means including an elongate rack fixed to the yoke to extend parallel with the cylinder and piston unit, a pinion rotatably carried by the lower piston head and meshed with the rack and an operating lever connected with the pinion.

References Cited in the file of this patent UNITED STATES PATENTS 1,270,667 Smith June 25, 1918 2,327,920 Moohl Aug. 24, 1943 2,365,151 Solomon Dec. 19, 1944