Hydrostress Ag

Other

Mecapec S.a.

Hans Bieri

Karl Rimmele

Ernst E Fuchs

To prevent overloading of a clutch interposed between a driving, or input shaft (2, 112) and a driven, or output shaft (4, 115) upon blockage of the output shaft while continuous rotary power is being transmitted to the input shaft, a plurality of centrifugal weights (16, 117) are located on an output clutch member (14, 116) so that, in case of blockage of the output shaft, centrifugal force will immediately cease and power transmitting engagement between the input and output shafts will be disconnected. In order to permit starting of the clutch, a predetermined small frictional force between an input clutch member (6, 114) coupled to the driving or input shaft (2, 112) and the output clutch member (14, 116) is established, essentially independent of speed, for example under control of springs (22). Since the power connection between the input and output shafts ceases immediately upon blockage of the output shaft, feedback of blocking force, and hence impact loading on a drive motor (14) coupled to the input shaft, and gearing and the like connected thereto is effectively eliminated. The clutch is particularly suitable for use in floor saw--power pack apparatus, power bearing tools, saws, snow blowers or the like, where blockage of the output shaft, unless instantaneously decoupled from a power drive may cause hazards, and/or apparatus damage.

Blockage-protected drive system with a centrifugal clutch, and sawing

To permit at least partial disassembly of a drive motor (2) from a coupled pump system (3) to provide high hydraulic pressure, and separate portability of the motor element and the pump element, a cart, with wheels (4), is provided with a horizontally transversely extending mounting plate (28) on which the motor (22) can seat, with its motor shaft (27) extending vertically. The pump unit (3), which can be formed of two or more high-pressure hydraulic pumps and include a cooling water circulating pump (14), has a vertically extending pump shaft (56). The motor shaft and the pump shaft extend through the mounting plate, and a transmission, preferably a belt transmission, is located below the mounting plate. The belt transmission may include a drive pulley which is hollow in the middle, and formed with an internal gear (33) which engages an external, axially curved gear (14') on the motor drive shaft, to form a separable coupling. The motor can be lifted off the cart, and transported separately.

Hydraulic energy supply cart

A rotary cutter saw apparatus (C, B) is movable along an elongated rail element (1). To permit continuous selected longitudinal adjustment of support blocks (8, 34) with respect to a base support suface (S) along the length of elongated rail element (1), an attachment base is formed on the rail element which interfits with a projection-and-recess fit with a portion of the support block. A clamping arrangement (7) can clamp the interengaging projection-and-recess portions together; preferably, they form a dovetail connection, with a movable clamping jaw which clamps both against the attachment base and the support block structure. The support block may include a plate (10), adjustably positioned over the surface by adjustment screw bolts, or a rod or tube element (35), so that the rail element (1) and the cutter element thereon, can also be tilted about the axis of the rod or tube element.

Guide and support structure for surface cutting apparatus

Recessed grooves are cut into bore hole walls of concrete or rock materials for the purpose of interconnecting two components of such materials at an interface between these components. These recessed grooves are cut by material removing tools which can be pressed radially outwardly, while a drive shaft simultaneously rotates these tools. For this purpose, an axial movement of an adjustment body is converted into a tilting movement of pivotable shafts which carry the material removable tools, whereby the adjustment body is moved linearly by a hydraulic lifting device. The material removing tools extend radially away from the lower ends of the pivotable shaft. The common adjustment movement of all of the pivotable shafts takes place independently of the rotation of the driven shaft.

Apparatus for cutting recessed grooves into concrete and rock material

The valve, preferably a dual control valve suitable for high pressure use, has a housing (2) formed with parallel bores in which rotatable valve elements (3,4) are located. The rotatable valve elements are each formed with a blind bore (22,23) coaxial therewith, and defining between an outer surface of the valve element and the blind bore a valve sleeve which communicates via lateral cut-outs (38,39) with inlets (11,12) to the blind bores. Valve sleeve portions (47,46) are left adjacent the cut-outs. The valve housing (2) is formed with outlet openings which can be exposed upon rotation of the valve elements to the remaining valve sleeve portions or to the cut-outs, respectively, to provide, selectively, CLOSED or OPEN positions of the respective valve elements. The housing and the valve elements are made of metal, the valve elements being fitted in the bore with slight amount of play. Pressure applied by a pressure fluid to the inside of the blind bores presses the respective valve sleeve portion against the outlet opening when it is rotated in CLOSED position. The valve elements (3,4) are coupled together for conjoint movement by gears (7,8,9), operated by a hand wheel (5).

Dual control valve suitable for high pressure fluids

To provide a portable demolition apparatus for concrete slabs, plates or the like, a clamping arch (1) having two end portions (12, 13) is equipped with pointed bolts (15, 16; 17, 18) at the ends; at least one (16, 18) of the pointed bolts is coupled to a cylinder-piston arrangement (21) which, upon application of high hydraulic pressure in the order of for example 800 bar, drives the pointed bolt towards the other, thus cracking the concrete plate, slab or the like between the points. Hydraulic pressure is obtained from a separately located pressure source, which permits construction of the arch of lightweight material, with an overall weight of 50 kg or less, with a jaw clearance opening of 45 cm or less, application of hydraulic force being controlled by a pilot valve-control slider arrangement (23, 24) located directly on the clamping arch and coupled to the remotely located pressure source by suitable pressure hoses.

Concrete plate, panel, wall or flooring demolition apparatus

To permit easy coupling and uncoupling of a concrete or rock circular boring or milling tool element (14, 17), two coupling parts (1, 2) are provided, a first coupling part (1) being formed with a recess (7) of non-circular cross-sectional shape, for example of approximate four-leaf clover shape, extending inwardly from an end face (11) of the first part; the second part (2) has a projection (20) of non-circular cross-sectional shape, matching the cross-sectional shape of the recess, and fitting therein, while being axially separable therefrom. The engagement surfaces (a, 22) of the respective first and second parts extend axially of the coupling elements. A retaining nut (3) retains the parts against each other. For centering of the parts, prior to assembly, interengaging matching centering arrangements are provided, for example by a circular ring cut into the first part ahead of the recess, the projections of the second part extending to just about the circumference of the ring to permit fitting the first and second parts together before the projection is angularly aligned with the recess to permit slipping the projection into the recess while having been preliminarily centered with respect thereto.

Coupling system for boring tools

An instantaneous desired cutting position of a milling cutter or circular saw blade in a mobile apparatus for cutting hard materials, such as a concrete highway surface, is maintained even if the mobile apparatus travels over irregular or slanted surfaces. For this purpose the saw blade position is adjustable either by varying the position of the saw blade mounting in a machine frame or by varying the position of the entire machine frame. The position correction is accomplished by a sensor which produces control signals for a position correction power drive in response to pendulum movements which represent cutter or blade deviations from the desired cutting position. The position of the entire machine frame may be varied by raising or lowering a wheel remote from the cutter or blade. Thus, a binding or jamming of the cutter or blade is prevented.

Mobile concrete or rock cutting apparatus

A concrete cutting or milling apparatus has a milling head carrying a power driven circular saw blade or milling cutter movable along a guide rail having a plurality of guide rail sections that may be coupled to each other in the longitudinal direction. The guide rail sections are supported by a foot structure that can be screwed to a concrete member, such as a wall or floor, to be cut. The foot structure is releasably secured to the guide rails however in a torsion stiff manner. Further, the foot structure is provided with adjustment screws for the proper axial alignment of the guide rail sections relative to each other to provide for a correction of the rail position and for compensating an uneveness in the surface of the concrete member to be cut. The structure is lightweight and one operator can secure the rail sections to a concrete surface. The rail sections form a closed cross-sectional tubular shape which may be round or substantially box shaped.

Concrete cutting or milling apparatus including a guide rail

In shears for rod-form material, especially in connection to roll trains, the problem exists of a space-saving construction, especially in the sidewise direction, in view of the multiple arrangements, as well as increased safety (reliability) of operation for the high-pressure hydraulic system of the cutting drive. The shear provided with two knife holders (MT1, MT2) and a fluid drive element (ZK) as well as a respective pressure feeding device (DS), is so designed, for this purpose, that the pressure work chambers (DA1, DA2) of the drive element, such as a double-acting cylinder-piston arrangement, and the elements carrying pressure fluid (high-pressure pumps, etc.) of the pressure feeding device (DS) are designed to be movable in common with a knife holder (MT1) which is movable in relation to the machine frame or a conduction (SF) of material to be cut, and preferably fixed in space with this latter (MT1).

Shear for cutting rod-form material

A shear for cutting bar stock includes upper and lower cutting blade supports each having a cutting blade, and a hold-down member, all pivotally connected about a working bearing. This assembly is pivotally mounted about a second bearing or pivot axis on one end of a frame of the shear, and is height-adjustable by a lockable hydraulic actuator attached to the upper cutting blade support at the opposite end of the shear, to provide vertical adjustability of the cutting point with minimal horizontal or angular displacement thereof. Preferably, the two pivot axes and the cutting point are coplanar. The upper cutting blade support is pivoted relative to the lower one by a hydraulic actuator engaging the upper support at one upper part thereof which is not so coplanar, to provide both a relatively long lever arm and a relatively long cutting arm for minimizing arcuation of the cutting movement. One cutting blade is adjustable within its support for optimum positioning taking into account the shape of the stock. The hold-down member is hydraulically locked into position with the lower (thrusting) cutting blade and moves therewith relative to the upper (contact) cutting blade, providing a three-point support to yield a clean cut.

Shearing device for cutting bar-shaped stock such as rolled steel billets

The present clamping device is intended for releasably connecting a driving member, such as a shaft driving a drill bit, in a force transmitting manner to a tubular driven member, such as the boring pipe or tube. A clamping body fits into the free end of the tubular member in a centering manner. The drill shaft may be secured to the centering, clamping body, for example, by a threading. The centering body has a ring groove which receives a clamping ring having a wedging slot extending axially through the clamping ring. A wedge may be forced into the wedging slot by means of a screw, whereby the clamping ring is expanded radially outwardly to connect the centering clamping body to the tubular member.

Clamping device, especially for rock or concrete drills

The present jig saw blade is constructed for heavy duty work, such as cutting through concrete or masonry. For this purpose, the blade is provided with a cooling channel extending longitudinally through the length of the blade and branch channels extend laterally through the body of the blade from a narrow side thereof and into the longitudinal channel. The lower end of the longitudinal channel is closed and the upper end is arranged for connection to a cooling fluid supply.

Jig saw blade with cooling channel

An apparatus with a motor driven material removing tool for cutting, drilling, milling, sawing or grinding of concrete, stone or the like. The apparatus comprises three spaced apart operational groups, namely a working group, a vacuum source and control group, and a driving group. The groups are mobile and interconnectable and disconnectable by hoses and electrical cables. The working group comprises an interchangeable tool, such as a drill, drive motor means for driving and advancing the tool, and a tool holding device mounted on the outside of a rigid suction bell. The vacuum and control group includes vacuum producing means and electrical and fluid control units. The driving group has at least one hydraulic pressure pump with motor means for generating the hydraulic power for driving and advancing the tool.

Apparatus with a motor-driven material removing tool, especially for

The Present heavy duty jig saw is constructed for cutting through walls of concrete, masonry, and the like. For this purpose a somewhat elongated suction bell carries a guide bar secured to one longer side of the bell. The guide bar in turn carries tool carrier means which are movable back and forth along the guide bar by a separate hydraulic drive. The tool carrier supports a tool head which is reciprocable by a second hydraulic drive. The suction bell is provided with a sealing skirt around its open edge and preferably adjustable legs secured to the bell limit the elastic deformation of the sealing skirt.

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Pfaffikon, Switzerland

Hans Bieri