Abstract: Automatic calibration equipment for planar grinding machines comprises a measuring head (12) fixed to a table (4) of the associated grinding machine for measuring the distance between this table and the grinding wheel (6), and an electronic measuring and control apparatus (14) for receiving the output signal of the measuring head and producing signals controlling the forward and rearward movement of the grinding wheel. The measuring head comprises a pneumatic circuit with a first branch of very low internal volume provided with an inlet nozzle and a measurement outlet nozzle (48) oriented to blow towards the edge of the grinding wheel, a second branch provided with an inlet nozzle and a reference nozzle, means for connecting the inlet nozzles of these branches to an installation (18) delivering compressed air at regulated pressure, and a pressure-differential transducer with a semi-conducting element for detecting the difference between the pressures in the two branches.

Abstract: A mineral cutter pick and its pick box are secured together through a spigot and socket connection. Opposed end faces of the pick and holding device that surround the connection have laterally oppositely inclined surfaces at opposite sides of a central plane of the pick extending in the direction of cutting movement. These complementary inclined faces improve the load distribution between the pick and its locking device in use and can also be arranged to restrict the entry of foreign matter into the spigot and socket connection.

Abstract: A clamping device comprising an elongate bar (1) a first abutment member (2) fixed in position on the elongate bar (1) and a second abutment member (3) slidably mounted on the elongate bar (1). A peg (12,17) carried by both the elongate bar (1) and the second abutment member (3) enables each to be secured to a respective jaw of a vice such that in use movement of the jaws of the vice relative to one another results in a corresponding movement of the two abutment members (2,3) relative to each other.

Abstract: An adjustable device for rigidly holding any one of several different types of automotive hydraulic system master cylinders during assembly, disassembly, testing, maintenance, bleeding, and repair procedures, and a method of using same is described. A drip pan is provided to catch drips emanating from a master cylinder being held, if desired.

Abstract: The low-pressure hoisting air cushion has an airtight chamber the walls of which (20) consist of a coated fabric which is elastic. Inserted into a hole (22) of the wall is a nozzle (24) of a valve. It consists of a tube socket accessible from the outside (26) and a ring-fastener (28) fitted internally. A compensation ring (34) is fitted between the ring-fastener (28) and the wall (20). It has a greater diameter than the ring-fastener (28) and is joined on one side to the ring-fastener (28) and to the wall on the other side (20) in such a way via a ring shaped joining area that there is created between both of them a circular shaped compensation zone (36) to which the compensation ring (34) is not attached on either side (FIG. 1).

Abstract: The power operated clamp secures a workpiece relative to a work piece support and includes a cylinder having a reciprocal piston and connected piston rod projecting from the cylinder. A bifurcated hollow housing is connectable to the cylinder and has an elongated internal guide slot with a free end of the piston rod extending within the guide slot. A pair of coaxial apertures having a common axis offset and the perpendicular to a longitudinal axis of the guide slot are formed in the housing. A rod end is connected to the free end of the piston rod for reciprocal movement and is slidingly guided within the guide slot. A pivot pin is rotatably disposed within the coaxial apertures for angular movement about the common axis and has an end extending externally from the housing and a lever arm extending internally within the housing.

Abstract: A disk grinding machine includes a grinding disk (5a), driven by a driving shaft. A handle projects laterally out of a machine housing and is covered by the machine housing. A dust suction installation with a suction hood is provided which covers the upper side of the grinding disk and overlaps its circumference. The installation contains a suction chamber having a bristle rim at its lower end which is fastened to the machine housing. The bristle rim extends only over a part of the circumference of the suction hood. The grinding dust is picked up through the area between the circumference of the grinding disk and the bristle rim and to the suction chamber (11a). The upper part of the suction hood is connected to the machine casing and a lower part of the hood is disposed pivotally and independent from the grinding disk and it supports a bristle rim. A handle for the machine comprises a control grip which is in a driving connection with the lower part of the hood through a drive.

Abstract: A reversible ratchet wrench (10) includes a wrench body (11) having a unitary head (12,12') including a driver opening (20) and pawl recess (24). A driver (26) having a ratchet portion (28) received within the driver opening (20) includes ratchet teeth (30) located between oppositely facing first and second planar surfaces (16,18) of the wrench head. A pawl (38) is received within the pawl recess (24) of the opening (20) and includes pawl teeth (40a,40b) that extend between the first planar surface (16) and a pawl skirt (25) that closes the pawl recess (24) adjacent the second planar surface (8). The ratchet and pawl teeth (30 and 40a,40b) have continuous engagement between the wrench head surfaces (16,18) to selectively lock the driver in one direction and permit ratcheting in the other direction. Driver opening (20) and pawl recess (24) of the wrench head (12) have cylindrical shapes which facilitate manufacturing and the support of both the driver and the pawl upon assembly.

Abstract: A staple remover is provided comprising two levers pivotally coupled at one end and being movable towards one another at their other ends. A pair of extraction jaws are formed at the movable ends of the levers for engaging the underside of a staple embedded in a material to thereby lift the staple away from the material. The staple remover also comprising an engaging member located adjacent the extraction jaw in one of the levers and forming a slot with said extraction jaw. The engaging member will engage the upper surface of the staple to thereby anchor the staple at a middle portion thereof for clean and uniform withdrawal of the staple ends from the paper.

Abstract: A fixture for accurately locating a workpiece during machining operations. A table includes a plurality of frusto-conical openings arranged in a grid pattern to receive locator pins each having a frusto-conical base to seat closely in the opening in which it is inserted. The locator pins establish stops against which some parts of the workpiece are positioned. The workpiece is held against the pins by power cylinders carried on special pegs that can be inserted in the table openings. Air for operating the cylinders is made available to each opening through a valved line and a passageway extending to each opening in the table. Each peg has a passage arranged to receive the incoming fluid from the opening and to transmit the air to its cylinders to extend them against the workpiece.

Abstract: A disc wheel sanding machine includes a disc wheel rotated by a drive shaft. The sanding machine has a dust extraction device with a dust extraction hood comprising an extraction chamber which surrounds the disc wheel. The hood of the dust extraction device ends above the disc wheel bottom, and a closing wall in the form of a bristle ring or such like protrudes from the bottom of the hood and can be positioned on the work piece. The bristle ring only encircles a part of the periphery of the disc wheel and forms a suction slot diverging outwardly toward the front end in the direction of rotation of the disc wheel and is open toward the work piece. The sanding dust is sucked through the suction slot at the disc wheel periphery into the extraction chamber. The rear end of the bristle ring with regard to the direction of rotation closes in on the disc wheel periphery and forms a rear seal for the suction slot.

Abstract: A machine for cutting a block of stone material into slabs, comprising a bandsaw provided with a blade movable along a plane of cut and a carriage able to support the block and to cause its approach motion towards the blade. This blade passes over two fly-wheels one of which is driven, mounted on a body which is oscillatable with respect to a base of the saw; the body is provided with a template cooperating with an inclined plane fixed to the base and is alternately movable on this under the thrust of a pair of hydraulic actuators.

Abstract: A rotary hoist generally comprising a vertically extending shaft, a tubular housing telescoped over and rotatably supported on the shaft, a boom pivotally secured to the tubular housing and a jack pivotally secured between the housing and the boom. The shaft is supported by a leg socket member with elongated legs. The rotary hoist may be disassembled for storage or shipping.

Abstract: The scissor lift has two parallel sets of legs. Each set has one end of an inner leg pivoted on a base and the other end slideable on the elevating platform. One end of the outer leg of each set is pivotally connected to the platform while the other end slides on the base. The mid portion of the legs are pivotally connected on a pin which also supports a crank which can rotate about 90.degree. between a first generally horizontal position in which the actuated end of the crank is eccentric to an imaginary line connecting the pivot pin and the pivot of a ram which actuates the end of the crank. Initial actuation of the crank 90.degree. raises the pivot pin and the actuated end of the crank to increase the mechanical advantage of the ram. The angle of the ram now has adequate uplift to be as effective as the prior art while requiring about 1/2 the storage height. A stop bar is pivoted on the pivot pin and has a free end or tail slideable along the base as the pivot pin rises.

Abstract: A plumbing tool having a ring with a circular structure defining an opening that extends through the circular structure. The circular structure is formed with a slot, and a pair of threaded apertures are disposed on opposite sides of the opening in order to communicate with the same. Each of the threaded apertures terminate in a recess disposed within the circular structure and communicating with the respective threaded aperture. A bolt threadably passes through the pair of threaded apertures for winding and narrowing the opening. A second pair of threaded apertures extend through the circular structure in a generally opposed relationship for threadably receiving a pair of handles.

Abstract: An angle-adjustable workpiece seat includes a base having a bottom surface, a top surface having a concave primary supporting surface, a confining surface, a receiving groove and holes, a locking piece having a pressing surface and corresponding holes, threaded elements threaded through corresponding holes of the base and the locking piece for driving the locking piece to laterally translate in the receiving groove, and a sliding member having a top V-shaped positioning surface and a bottom sliding rail complementary to a sliding groove formed by said pressing, primary supporting and confining surfaces and having a primary sliding surface matching against and slidable on the primary supporting surface. The bottom surface can detachably attach thereunder two identical cylinders. The positioning surface can include two plane surfaces each of which detachably attaches thereto a pad piece.

Abstract: The door forcing apparatus for forcing a door set in a door jamb comprises two side rails each having a substantially L-shaped cross section engagable with a beveled edge between the door jamb and the door, a plurality of nearly flat drive wedges pivotally mounted on the side rails adjacent their vertices each having a nearly flat foot oriented parallel to the door pivotally mounted adjacent their circular-arc-shaped edge pressible against the door, two adjustable braces each of which comprise a bracing hydraulic cylinder or a turnbuckle which is pivotally attached to each of the two side rails adjacent one end of the apparatus, two U-shaped-cross-sectioned drive rods on each of which the drive wedges connected to the side rails are pivotally mounted and two driving hydraulic cylinders, each of which has a piston rod pivotally attached to an end of one of the drive rods and whose cylinder is pivotally mounted on a support bracket at one end of a side rail.

Abstract: A self-aligning post cutting jig comprising four elongate cutting guide members each having fasteners at opposing ends thereof for securing the guide members together in a closed four-sided jig for placement on a post. The fastener is adapted to provide a first securement mode wherein the ends of the guide members are spaced-apart to facilitate placement onto a post and a second securement mode wherein the ends of the guide member are brought into contact with the post so as to provided square and true cutting guide thereon.

Abstract: A system for the assembly of devices for fixing workpieces to machine tool tables, including a base plate, which can be fixed to the machine tool table, or the like. Fitting holes are formed in the base plate with regular coordinate spacings. In the base plate, in a plane at right angles to the fitting holes, are formed preferably intersecting cross holes, whose diameter corresponds to that of the fitting holes. Nuts for the fitting screws are inserted both in the cross holes and the fitting holes, in order to fix mounting parts to the base plate. The cross-section of each nut corresponds to that of each cross and fitting hole. The mounting parts are preferably provided with cross and fitting holes similar in arrangement to the base plate.

Abstract: A hydraulically elevatable ramp apparatus is set forth wherein a ramp formed of an upper and lower portion with a pivotal hinge joining the two portions secured to a hydraulic jack at a forwardmost position. The ramp at a first lowered position accepts vehicles of diminished ground clearance wherein the vehicle is thereafter elevated to a second position whereupon the lower hinged portion is automatically repositioned upon elevation of the upper portion. The jack is formed with a resilient pad to insure a non-slip arrangement upon elevating a vehicle to a second elevated position.