DE2264164A1 - HYDRAULIC SUPPORT DEVICE - Google Patents

Description

Hydraulic support device

The invention relates to a hydraulic support device for supporting the sides of a trench, an excavation or another cavity, various devices have hitherto been used to prevent the danger of collapse to avert the sides of the trench or excavation " For example, lumber and steel were used for support elements, and mechanical punches were used for stiffening of pit side walls o

An extremely effective support device is a hydraulic support device, as it is, for example, in the U.S. Patent 3,224,201. In this document, the use of a hydraulic working cylinder arrangement shown, which is connected with rails to support trench sides. One of the things that come with using the in

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the publication mentioned device difficulties encountered shown lies in the fact that the hydraulic cylinder of the hydraulic working assemblies is exposed to dirt, mud and water ₀ After a certain time, the dirt, mud or the water between the moving parts of the hydraulic operating cylinder arrangement may in work or between these Parts seep in, causing damage that needs to be repaired.

US Pat. No. 3,362,167 therefore proposes an over-sleeve which can be fitted over the piston rod and the cylinder of the hydraulic working cylinder arrangement in order to protect the piston rod when it assumes an extended position _{or the like}

The object of the invention is therefore to create a new and improved support device in which the penetration of dirt, mud or liquids into the mechanism is prevented even better. This is now done according to the invention characterized in that the hydraulic support device having spaced separate grave rails that are connected by a hydraulic working cylinder device articulated to one another _o The hydraulic working cylinder device comprises a hydraulic cylinder with a piston which is slidably supported in the cylinder _o A piston rod is attached to the Piston attached, and the cylinder is articulated or rotatably attached to one of two spaced apart trench rails, while the piston rod is in rotary connection with the other rail of these two trench rails. In order to protect the cylinder and the piston rod, a protective sleeve device is provided, which is mounted both over the cylinder and the piston rod, even when the piston rod is in the extended position.

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located in order to protect these parts against the ingress of dirt and mud.

The protective sleeve device has a first sleeve, which lies over the piston rod, as well as a second sleeve, the is mounted over the first sleeve and the cylinder. The first and second sleeves are in sliding contact with each other, and sealing means are provided between these two sleeves and between the first sleeve and the cylinder in order to prevent fluids from entering the hydraulic cylinder and piston and piston rod mechanism.

In another embodiment of the invention, both Above the cylinder and above the piston rod in the extended position, a spiral-shaped, extendable sleeve is mounted, which can be moved to a retracted position when the piston rod is retracted.

In addition, the new type of support device enables the effective length of the hydraulic Adjust the working cylinder arrangement in the extended state. According to the invention, this is done with the aid of screw connections between the piston and the piston rod and between the piston rod and a piston rod buffer or piston rod block, which articulates the piston rod with one of the trench rails.

The invention is explained in more detail below with reference to the exemplary embodiments shown in the drawing. In the drawing show:

1 shows a perspective view of an embodiment of the hydraulic support device,

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Fig. 2 is a sectional view of a hydraulic Arboix.

cylinder arrangement along the line 2-2 in Fig. 1, Fig. 3 is a sectional view of the cylinder and Strör.imgD ·

in the middle transfer block of the device länca

dor line 3-3 in Fig. 2, and Fig. k is a plan view of another embodiment 3form CL'jz

Protective sleeve device.

In the drawing, rait S generally indicates a hydraulic support device that supports the sides of a trench, channel or other cavity. The support device S has opposite trench rails 10 and 11 which are connected to one another and which can be folded up and extended with the aid of upper and lower hydraulic working mechanisms 12 and 13, respectively. The upper hydraulic working cylinder mechanism 12 is connected to the lower hydraulic working cylinder mechanism 13 by a hose Ik and a supply hose 15 is also connected to the upper working cylinder mechanism so that hydraulic fluid can be supplied under pressure to operate both hydraulic working cylinder mechanisms 12 and 13 substantially simultaneously * Of course, the fluid communication between the upper working cylinder mechanism 12 and the lower working cylinder mechanism 13 also provides coordinated movement of these two hydraulic mechanisms.

The rail 11 is an elongated, flat metal rail with a substantially flat outer surface 11a which can be pressed against a portion of the side wall of a trench, channel or other cavity to support that portion, support ribs 11b and lic extending from the inner surface lld of the splint Ii in the longitudinal direction over the entire length of the splint inwards. Each rib, so for example-

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, the rib Ov, has, as from the cross sectional view of Fig. 2 it can be seen, L-shaped portions lie and ilf _t The parts He and Hf form a transition piece Hg, further reinforces the neck rib Hb. Similarly, the support rib Hc is L-shaped.

The opposite rail 10 has a flat outer surface 10a and support ribs 10b and 10c which extend in the longitudinal direction of the rail on its inner surface 10d . The support ribs 10b and 10c are similar to the support ribs Hb and Hc in terms of their cross-sectional configuration.

In Fig. 2, the upper hydraulic working cylinder mechanism 12 is shown together with the opposing rails 10 and H in cross section. It should be noted that the lower hydraulic working cylinder mechanism 13 is basically identical to the upper mechanism 12 in terms of its structure. Therefore, the reference numerals referring to the upper working cylinder mechanism 12 are also used for the lower mechanism 13, with certain restrictions to which attention is drawn.

Dar upper hydraulic working cylinder mechanism 12 has a cylinder 16, which is threaded with a outer end portion l6a is provided. A cylinder chuck 17 (Fig. 3) has a threaded opening 17a into which the threaded end portion 17a of the cylinder are screwed in can. An O-ring seal 18a is seated in an annular groove 17b in the cylinder chuck 17. The other is between the O-ring 18a and the end face l6b of the cylinder i6 an annular, elastic seal 18b arranged to prevent the passage of Liquid between the cylinder liner 17 and the cylinder end part l6a to prevent.

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As can be seen from FIGS. 2 and 3, the cylinder chuck 17, which could also be referred to as a cylinder block, also has a screw bolt opening 17c which can be brought ^{into alignment with the openings 11b 1} and lic 'in the rail support ribs 11b and lic . A screw bolt 19 extends through the rib opening lib ', the bolt opening 17c and the rib opening lic ¹ and is through a nut 19a t which fixes another suitable element. In this way, the cylinder chuck 17 cooperates with the screw bolts 19 to support the cylinder 16 rotatably so that it can perform threatening or pivoting movements with respect to the rail 11.

The cylinder liner 17 has a first opening or bore 17d which is in fluid communication with a second threaded opening or bore 17e via a chamber 17f. The chamber 17f opens up into the threaded opening 17a. A channel 17g connects the threaded hole 17d with the chamber 17f. The hydraulic fluid supply hose 15 is equipped with a plug-shaped coupling element 17a which can be screwed into the bore 17d in the chuck 17 for the upper hydraulic working cylinder mechanism 12 and thus establishes a connection. Furthermore, the hydraulic line 14 is connected to the threaded bore 17e of the chuck 17 for the upper working cylinder mechanism with the aid of a plug-shaped coupling element (not shown). The hydraulic hose Ik is also connected by a plug-shaped coupling element iha to the bore 17a for the lower hydraulic working cylinder mechanism. The bore 17e of the cylinder chuck 17 for the lower working cylinder mechanism 13 is closed by any suitable threaded plug, not shown. Thus, the pressurized hydraulic fluid enters through the supply line 15 in

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the cylinder chuck 17 for the upper hydraulic ram mechanism 12 and runs through the upper cylinder liner 17, the hose 14, into the cylinder liner 17 for the lower Arbeitezyllndemechanisnms 13, so that this hydraulic medium Both the upper and the lower working cylinder mechanisms 12 and 13 are supplied substantially simultaneously will.

As can be seen from Fig. 2, the upper hydraulic Arbeltszylindermechanlsnius 12 on a Kniben 20, the ver, is slidably and sealed in the bore i6c of the cylinder. The piston 20 has a main body part 20a with an annular recess 20b. A shaft 21 is in that Piston 20 supported and threaded end parts 2ia and 2ib extending from the pistons 20 outward. A piston head plate 20c is on the threaded shaft end part 21b attached and attached there with a nut 2Od or another suitable element. The ring-shaped Recess 20b receives an annular seal 22 which is provided with a lip portion 22a which, under the action of the pressurized hydraulic fluid in chamber C, which is formed by the piston 20 in cylinder 16, can be pressed into sliding, sealing contact with the cylinder bore 16C is. A hollow rod 23 is over the threaded shaft end portion 21a screwed so that the rod is firmly connected to your piston 20.

As can be seen from FIGS. 2 and 5, there is a rod block 24 with a screw bolt opening 24a which is connected to the support rib openings 10b ^! and 10c ^{1 can be} aligned. A bolt 25 extends through the support openings 10b ^f and lic 'as well as through the bolt opening 24a in the rod block 24 and is through the nut 25a or other suitable member

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attached. The rod block 24 is rotatably mounted in this way, so that it can execute rotary movements with respect to the trench rail OK. As can be seen in particular from FIG. 5, the screw bolt opening 24a is arranged at the lower end 24b of the rod block 24. In contrast to this, as can be seen from FIG. 1, the cylinder chucks 17 are ^{articulated at their upper end 17c 1 with} the trench rail 10 so that they can rotate at the upper end. However, the rod block 24 for both the upper and lower ram mechanisms 13 and 12, respectively, is rotatably connected in a manner that enables it to rotate to the lower block end 24b.

A threaded stem 26 is inserted into the threaded opening 24c in FIG Rod block 24 screwed in. The direction of rotation of the threaded part 26a of the threaded pin 26 which sits in the rod block 24, is the thread running direction or thread direction of the remaining thread part 26b of the pin 26 opposite. For example the threaded part 26a has a left-hand thread, while the thread of the threaded part 26b is right-handed is.

The hollow rod 23 is further provided with a threaded end portion 23b which has a right-hand thread, so that the hollow rod 23 can be screwed onto de threaded part 26b of the pin 26, whereby the rod 23 to the rod block 24 is attached, which is rotatably mounted with respect to the trench rail 10. An arrotation pen For example, a cotter pin or mandrel 27 can be provided with openings in the threaded rod 23 and the threaded pin 26 Align and position in alignment to secure the rod block 24 in a rotationally fixed manner with respect to the rod 23.

The rod block 24 has an annular rib portion

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24d, which consists of one part and extends inward. The annular rib 24d may also be a tubular segment that is welded onto the rod housing 24 or otherwise attached to the housing. A protective sleeve 30, the inside diameter of which is substantially equal to the outside diameter of the annular rod housing rib 24d, sits over the rod housing rib 24d. Countersunk screws 31 extend through the protective sleeve 30 and are in contact with the annular rib 24d to support the protective sleeve 30 and attach it to the rod housing 2h . The length of the protective sleeve 30 is chosen so that the end part 30a of this sleeve slides over the cylinder 16 even when the piston 20 and the rod 23 are fully extended. This fully extended or extended position of the protective sleeve 30 is shown schematically in FIG. In the fully extended position for the piston 20 and the rod 23, the piston is essentially at the end of the cylinder 16d, as indicated by the letter E. When the piston 20 and rod 23 are fully retracted or retracted, the piston 20 is substantially adjacent to the threaded sleeve end portion i6a, as indicated by the letter R. In the retracted position, the protective sleeve 30 is pushed essentially completely over the cylinder 16. A sealing element in the form of an O-ring 32 is located in a groove 30b at the sleeve end 30a to prevent the penetration of liquid between the sleeve 30 and the cylinder 16. A pipe section 33 is mounted on the inner surface 17h of the cylinder liner 17 and extends towards the rail 10. The pipe section 33 can be welded or otherwise attached to the inner surface 17h. If desired, the tube section 33 can be made in one piece with the rod housing. An outer protective sleeve 35 is mounted over the annular pipe section 33 and fastened to it by countersunk screws 36.

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The outer protective sleeve 35 extends over the inner guard sleeve 30 and is in sliding contact with her, even when the piston 20 and the rod 23 are in her fully extended position E. An O-ring 37 is arranged in a groove 35a of the outer protective sleeve 35 and carries the outer protective sleeve 35 is slidable and sealed so that it has a sealing sliding movement over the inner protective sleeve 30 can perform. When the piston 20 and rod moves to the retracted position R described above then the inner sleeve 30 moves within the outer sleeve 35, whereby a double protection is created for the cylinder 16. Accordingly, by using the protective inner sleeve 30 and outer sleeve 35 both the rod 23 and the cylinder 16 against the penetration of Mud, dirt and liquids are protected, even when the piston 20 and the rod 23 are in the above described extended position E are located.

Also Flg. 4 shows the basic hydraulic support device S, in which embodiment a helical telescoping sleeve is supported over the cylinder 16 and the rod 23. The small end 40a of the helical sleeve 40 sits in the annular rib 24d of the rod housing 24. The larger end 40b of the helical sleeve is located in the annular rib or tube section attached to the cylinder liner 17. The spiral sleeve acts to expand when the k'o * Lb'en * 2ö and rod 23 are moved to the extended position, as shown in Figure 4, and to a collapsed position contracts as soon as the piston 20 and the rod 23 are returned to the retracted position. The helical sleeve 40 is essentially formed from a continuous piece of metal that is helically wrapped in a telescopic shape, see FIG

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that the individual turns, for example the turn 40c, in adjacent, larger turns, for example in the turn 40d, are inserted when the spiral sleeve is contracted between the rod housing 24 and the cylinder chuck 17. Such a spiral sleeve is in the U.S. Patent 3,300,042.

The hydraulic support device S described herein generally operates as follows in use. The trench rail 11 has a handle 42 which is rotatably mounted on the upper end of the rail with the aid of a suitable device. Similarly, the trench rail IQ has a handle 43 which is also rotatably attached to the upper end of the rail. The hydraulic support device S is lowered into a channel or ditch using hooks, not shown, into which the handles 42 and 43 are hung. In general, the support device S is in a collapsed state when it is first lowered into a trench. In the folded state, the upper and lower hydraulic ram mechanisms are arranged at acute angles with respect to the rails 10 and 11. This folded-up state is achieved in that the rail 10 in the direction of the arrow 44 or the rail 11 in the direction of the arrow 45 or that both rails are moved simultaneously in the relevant directions. When the support device S is moved into the folded position described, the cylinder chucks 17 rotate about the upper ends 17c ^! of the device, and the rod housings 24 rotate about the lower ends 24b of the device.

When the hydraulic support device S has been arranged in the trench, the rail 11 rests on one • Side of the trench. A hook can then be placed in the handle 43

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been hooked to lower the rail IO until the upper and lower hydraulic working cylinder mechanisms 12 and 13 substantially perpendicular to the rails 10 and lie. When the hydraulic working cylinder mechanisms 12 and 13 substantially perpendicular to the rails 10 and are arranged, then the force transmission surface 171 abuts the cylinder chuck 17 on the inner surface lid of the rail 11. Similarly, the power transmission surfaces 24e lie the rod blocks 24 on the inner rail surface 1Od at. These power transmission surfaces, i.e. 24e for the rod blocks 24 and 17i for the cylinder mounts 17, butt against the inner rail surfaces iOd and lld and prevent a further rotation of the support device S, whereby the support device is in the extended state, as shown in FIG is locked.

Hydraulic fluid then flows through the supply line 15 to the hydraulic cylinder 16 for both the upper and lower hydraulic ram mechanisms or 13 supplied, whereby the hose 14 is also used, whereby the piston 20 and the rod 23 attached to it moved outwards into the extended position E. In this position, the effective distance d between the rails 10 and 11, that is the distance between the rail surfaces 10a and ila, its greatest value, and the rail 10 rests on the other side of the trench to be supported. Thus the sides of the trench supported and supported by the counterforce in the cylinder :. 16 located, pressurized hydraulic fluid secured against collapse. It should be noted that the rails 10 and 11 can also be moved so that they have a smaller than the maximum distance from each other, which is indicated by the letter d to in this way to support the sides of narrow trenches and to keep them in their condition.

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It should also be noted that the threaded hole 17d in each cylinder chuck 17 has an axis 45a, which in relation to is inclined by 7 ° on the axis 45b of the cylinder 16, wherein line 45c is parallel to axis 45b. It has it has been found that arranging the bore 17d at such an angle has less resistance to removal of hydraulic fluid from the chambers C of the cylinder 16 is effected when the rails, piston 20 and rod 23 are in the retracted position Position R are to be moved, as is indicated schematically for the piston 20.

There are now cases where the width of the channel or trench to be supported is greater than the maximum effective width of the hydraulic support device, which, as stated above, is generally designated by d. In such a case it should the effective length of the hollow rod 23 can be increased. This is achieved in that the hollow rod 23 in relation is rotated on the piston shaft 21, whereby the rod end 23c moves away from the piston 20. The effective length the rod 23 can then be further enlarged by pulling out the locking pin 27 and the screw bolt 25 can be removed from the rod block 24. Then the rail 10 can be moved away and the rod block 24 becomes. rotated, thereby causing the rod block to move away from the rod end 23d. The locking pin 27 can then be inserted into another, not shown here opening in the rod 23 and through one in the pin 26 located opening extend through in order to lock the pin 26 and the rod block 24 against rotational movement again. The rod block is then fastened back to the rail 10 with the aid of the screw bolt 25.

In this way, the effective length of the rod 23 and thus the effective distance d between the designed

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folded rails 10 and il enlarge so that the support device can also be used in trenches with a slightly larger width. It should be noted that for the above Purposes all suitable materials, including synthetic materials as well as Aluniniua and other metals, can be used are.

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Claims (9)

" ¹⁵ ~ 2 2 6 A 1 6 A PATENTAN'S CLAIMS ( i.) Hydraulic support device with two oppositely arranged trench rails, which can be arranged on the sides of a trench "" of the other cavity, further with a hydraulic working cylinder device which is connected to the trench rails in order to move these rails into an extended position, in which they support the sides of the trench or other hollow space, characterized in that the hydraulic working cylinder device (12, 13) has a hydraulic cylinder (16) in which a piston (20) is slidably mounted, to which a piston rod (23) is attached is, so that the piston and the piston rod are movable between retracted and extended positions depending on the entry and exit of pressurized hydraulic fluid, that the cylinder (16) by a cylinder joint device (17, 17c, 19) with one of the Trench rails (iO, il) is in rotary connection that the rod (23) by a rod joint device g (24, 24a, 25) with the opposite trench rail (10, 11) is in rotary connection, and that a protective sleeve device (30, 35) is provided, which is mounted on the cylinder (16) and the rod (23) if these are in the extended position to protect both the cylinder and the rod from damage. 2. Hydraulic support device according to claim 1, characterized in that the protective sleeve device (30, 35) a first sleeve (30) which is attached to the rod joint device (24) and nit the cylinder (16) in sliding Contact is, and that between the first sleeve (30) and the cylinder (i6) a first sealing element (30b) is arranged is to prevent the passage of liquid, dirt or mud between the cylinder and the sleeve. 409820/0217 " ⁱ⁶ " 3. Hydraulic support device according to claim 2, characterized in that the protective sleeve device has a second Has sleeve (35) which nit the cylinder joint device (17) is connected and extends over the first sleeve (30), with whom she is in sliding contact. 4. Hydraulic support device according to claim 3, characterized by a second sealing element (37) which is between the first sleeve (30) and the second sleeve (35) arranged is to create a seal between these two bodies. 5. Hydraulic support device according to claim i, characterized characterized in that the cylinder joint device has a cylinder chuck (17) which is screwed onto the cylinder (l6) and has a bore (17d) which is in fluid communication with the cylinder (16), a fluid hose coupling can accommodate and has an axis (45a) in with respect to the axis (45b) of the cylinder (i6) under one at an acute angle. Hydraulic support device according to claim 1, characterized in that the trench rails (10, II) are provided with opposing ribs (10b, 10c; 11b; lic) which extend over the length of the rails, that the cylinder joint device (17 ) the cylinder (16) is supported between the ribs on one of these rails, and that the rod joint device (24) holds the rod (23) between the ribs of the other rail. 7 "Hydraulic support device according to claim i, characterized characterized in that the protective sleeve means forms a spiral-shaped, extendable sleeve (40) which extends over the cylinder (16) and the rod (23) and is located between the cylinder 409820/0217 joint device (17) and the rod joint device (24) extends. 8. Hydraulic support device according to claim 1, characterized in that the rod (23) is hollow and at the one The end to which it is attached to the piston (20) has a thread comprises, and that the piston (20) is attached to a shaft (2l) which has a threaded part (21a) which extends into the rod (23) and nit the threaded end the rod is screwed, so that the effective length of the cylinder piston (20) and the rod (23) Combination can be adjusted in the extended state. 9. Ifydraulische support device according to claim 8, characterized characterized in that the rod joint device (24) forms a pressure block, which in the opposite trench rail " (OK) is rotatably mounted, that the hollow rod (23) is provided at its other end with a thread (23b), and that a threaded bolt (26) extends out of the pressure block and is screwed to the rod (23). 409820/0217