Other

Andreas Stihl

Andreas Stihl Ag & Co.

Dieter Wieland

Gerhard Meyer

Klaus Hoppner

Hermann Weiss

Herbert Armbruster

Hans Nickel

Gerhard Zerrer

Hans Dolata

Reinhold Fink

Anton Wehle

Volker Schurr

Jurgen Wolf

Gisbert Kohler

Reinhard Gommel

Gerd Itzrodt

Walter Gernhard

Adam Kelbert

Manfred Bortfeld

Siegfried Ryssel

Abou Aly

Hartmut Riess

Hans G Salomon

Jurgen Laser

Walter Merz

Hartnut Meinert

A motor chainsaw has a housing enclosing a motor with actuator and a saw chain. A braking device for the saw chain is positioned in the housing. The braking device has a brake drum and a brake band guided around the brake drum. The braking device has a brake lever connected to the housing so as to be pivotable about a first axis of rotation for moving the brake band from a release position into a braking position. A return kick brake for actuating the braking device is provided. The return kick brake has a ready position and an actuated position in which the brake band is in the braking position. The return kick brake has a hand protection grip, a control lever, and a return kick brake spring for loading the control lever. The control lever, when the return kick brake is moved from the ready position into the actuated position, pivots the brake lever into the braking position. A coasting brake for actuating the braking device has a transmission member, connected to the actuator and the brake lever, and a coasting brake spring for loading the brake band in the braking position. The brake lever has a second axis of rotation extending parallel to the first axis of rotation. The brake lever pivots about the second axis of rotation when the coasting brake is actuated.

Motor chainsaw with a chain braking device

The device for braking an electric drive motor of a hand-held working tool has a safety brake for an immediate stopping of the working tool and an independent mechanical brake for coasting the working tool to a stop after switching off the drive motor. The mechanical brake acts on a rotational part connected to the drive motor and is activated when a switch element for activating the drive motor is released.

Brake system with two independent mechanical brakes

The invention is directed to a motor-driven chain saw having a housing and a drive motor mounted in the housing for driving a sprocket wheel. The sprocket wheel, in turn, drives a saw chain guided around the periphery of a guide bar. The flat guide bar projects forwardly in the longitudinal direction of the chain saw and has a rearward end facing toward the sprocket wheel. Stud bolts fixed to the housing lie perpendicularly to the guide bar and project therethrough. The stud bolts also extend through a sprocket wheel cover laterally closing off the housing. The stud bolts have projecting free ends carrying respective nuts. In this way, the rearward end of the guide bar can be tightly clamped between the housing and the sprocket wheel cover. The stud bolts have respective other ends facing away from the guide bar which are tightly seated in the engine block of the drive motor. In this way, the loads acting on the guide bar can be taken up without danger of causing fractures in the housing.

Motor-driven chain saw

A motor-driven chain saw is electrically operated by means of a universal motor and has two brake systems operating independently of one another. A mechanical brake system serves as a safety brake and when actuated, the mechanical brake system brings the saw chain to a standstill instantaneously. The second brake system is an electric coasting brake, which when the switch is released stops the saw chain quickly but without recoil. The electrical braking is effected by reversing the polarity of one pole coil of the field winding and short-circuiting it with the rotor winding.

An oil pump is disclosed for a motor-driven apparatus and in particular for lubricating the cutting chain of a chain saw. The oil pump has a pump piston that is rotatable about its longitudinal axis and has a control cam for its axial reciprocation, which as it revolves comes into contact engagement with a control bolt. A control slide upon which a biasing force is exerted is associated with the pump piston. The stroke of the pump piston is limited during normal operation by means of the control slide. If an increased amount of lubricating oil is required, the limitation on the piston stroke effected by the control slide is overcome by moving the control slide away from the pump piston counter to its biasing force, so that the pump piston can move through its maximum total stroke as predetermined by the control cam.

Oil pump

A chain saw is disclosed having a drive motor which drives the sprocket wheel of the saw chain via a transmission stage. The sprocket wheel rotates in the same direction as the drive shaft of the drive motor and drives the saw chain in such a manner that the portion thereof traversing the lower periphery of the cutter bar moves toward the housing of the chain saw. The saw chain is braked with a braking arrangement which develops a braking moment that causes the chain saw to develop a reaction moment that opposes the kickback moment occurring as a consequence of the kickback action. In this way, the angle through which the chain saw is deflected during kickback is reduced. In addition, a compact configuration of the motor housing of the chain saw is obtained wherein the braking arrangement is kept free of dirt and chips.

Chain saw having a braking arrangement

The invention is directed to a motor-driven apparatus such as a motor-driven chain saw or the like. It includes a lubricating-oil pump and an oil supply for a work tool and is equipped with a device for interrupting the supply of oil to the tool. This facilitates use of the chain saw apparatus with an accessory attachment work tool such as a hedge trimmer, drilling tool or the like for which a flow of lubricating oil is unnecessary.

Lubricating-oil pump arrangement for a motor-driven apparatus

The invention is directed to an air-intake arrangement for a two-stroke engine for use in hand-guided, engine-driven apparatus such as motor-driven chain saws. The air-intake arrangement includes an air filter and a baffle wall for guiding fuel particles that are buffeted back out of the air induction channel by the engine. The baffle wall has a curvature to define a deflector to redirect the fuel particles in a largely gaseous state towards the carburetor. The arrangement provides an optimum air-fuel mixture which is not overrich and a trouble-free operation of the engine.

Air-intake arrangement for a two-stroke engine

A portable motor chain saw with a braking device, for stopping the saw chain during recoil, and with a release, for the braking device, which in the release position is operatively connected with a locking mechanism of the braking device. The release is an inertial mass which is freely movable along an acceleration path, with the kinetic energy of the inertial mass in the release position being greater than the resistance force of the locking mechanism. The release is held in the ready position by at least one holder, preferably a spring which extends between the saw housing and the release.

Portable motor chain saw

A power saw, especially power chain saw, in which a sprocket wheel is driven by a motor through the intervention of an intermediate clutch acting as safety clutch, and which comprises a control member for disengaging the intermediate clutch. The control member is by means of an actuating member returnable to its ineffective position. The power saw furthermore comprises a follower member which is movable from an engaged position to a disengaged position and vice versa for respectively connecting and disconnecting the clutch elements of the intermediate clutch. The power saw also includes a clutch with a clutch drum and also has a brake member cooperating with the clutch drum. The brake member is designed as brake band and is looped around the clutch drum. The control member and the brake band have one end mounted on a common holding element which latter by means of the actuating member and against the thrust of a spring is held in its rest position and by the force of the spring is movable into a disengaged position for releasing the brake band and for disengaging the control member.

Mechanism to control power chain saw clutch operation

An apparatus for measuring the carbon dioxide content of fluids, especially beer, is described in which there are two pistons disposed on either side of an expansion chamber, the pistons being in cylinders of different displacement volumes, the pistons being displaceable axially together to effect expansion whereby equilibrium between carbon dioxide in gas and in fluid is established thereby permitting, via pressure measurements, a determination of the carbon dioxide content of a fluid sample.

Apparatus for determining the carbon dioxide content of a liquid,

An improvement in a process for introducing carbon dioxide into a liquid flowing through a main line, the improvement residing in withdrawing a portion of said liquid through a by-pass line, introducing carbon dioxide into said liquid while in said by-pass line and returning the carbon dioxide enriched liquid to said main line while adjusting the amount of carbon dioxide introduced into said by-pass line to provide a desired carbon dioxide concentration in said liquid in said main line and a device therefore. The process and device disclosed are especially useful for introducing a gas into a beverage, for example, beer, mineral water, barley water, fruit juices, milk and generally alcoholic and nonalcoholic carbon dioxide containing beverages.

Process for introducing a gas, in particular carbon dioxide, into a

A measuring cell for the continuous determination of the carbon dioxide content of a flowing liquid. The cell comprises an inner chamber having a first substantially cylindrical portion, an input conduit for the feeding of liquid to the cell and a discharge line for the removal of the liquid. The input conduit has a portion entering at one end of the first portion tangentially to its peripheral surface and a discharge line has a portion disposed in a direction of the longitudinal axis of the first portion and entering the chamber below the input conduit. The input conduit is constricted at or immediately ahead of the point of entry and a device is disposed within the chamber in the immediate vicinity of the point of entry or directly ahead of the entry of the discharge line for measuring the temperature of the liquid and a second device is disposed at the inner wall of the first portion for measuring the outgassing pressure of the liquid. The two devices produce electrical signals corresponding to the measured values and conductors carry the signals out of the chamber of the measuring cell.

Growing community of inventors

Remseck, Germany

Dieter Wieland