US3714741A — Grinding machine with size controlled dressing me…

Claim 1

Independent Claim 227 words

A grinding machine for generating a surface of revolution on a workpiece, comprising a. a base, b. a workhead table mounted on the base and adapted to carry the workpiece and rotate it about the axis of the surface of revolution, c. a wheelhead table mounted on the base and adapted to carry a wheelhead in which is rotatably mounted a spindle having an abrasive wheel mounted thereon, d. a hydraulic cylinder connecting the base to one of the tables to produce relative movement between the tables to cause engagement of the abrasive wheel and the workpiece for a grinding operation, the cylinder being connected selectively to sources of low pressure and high pressure fluid, the cylinder being connected for discharge selectively through a restrictor and through an unrestricted conduit to drain, the unrestricted conduit being operative and the cylinder being connected to the source of low pressure fluid as the wheel approaches the workpiece and before engagement therewith, e. a switch operable during the said relative movement to make the restrictor operative with the cylinder at approximately the same time that the wheel makes engagement with the workpiece, and f. a timer which is started by the switch and which, after a predetermined interval of time, changes the connection of the cylinder from the source of low pressure fluid to the source of high pressure fluid.

Claim 2

Dependent Claim 227 words

A grinding machine for generating a surface of revolution on a workpiece, comprising a. a base, b. a workhead table mounted on the base and adapted to carry the workpiece and rotate it about the axis of the surface of revolution, c. a wheelhead table mounted on the base and adapted to carry a wheelhead in which is rotatably mounted a spindle having an abrasive wheel mounted thereon, d. a hydraulic cylinder connecting the base to one of the tables to produce relative movement between the tables to cause engagement of the abrasive wheel and the workpiece for a grinding operation, the cylinder being connected selectively to sources of low pressure and high pressure fluid, the cylinder being connected for discharge selectively through a restrictor and through an unrestricted conduit to drain, the unrestricted conduit being operative and the cylinder being connected to the source of low pressure fluid as the wheel approaches the workpiece and before engagement therewith, e. a switch operable during the said relative movement to make the restrictor operative with the cylinder at approximately the same time that the wheel makes engagement with the workpiece, and f. a timer which is started by the switch and which, after a predetermined interval of time, changes the connection of the cylinder from the source of low pressure fluid to the source of high pressure fluid.

Claim 3

Dependent Claim 227 words

A grinding machine for generating a surface of revolution on a workpiece, comprising a. a base, b. a workhead table mounted on the base and adapted to carry the workpiece and rotate it about the axis of the surface of revolution, c. a wheelhead table mounted on the base and adapted to carry a wheelhead in which is rotatably mounted a spindle having an abrasive wheel mounted thereon, d. a hydraulic cylinder connecting the base to one of the tables to produce relative movement between the tables to cause engagement of the abrasive wheel and the workpiece for a grinding operation, the cylinder being connected selectively to sources of low pressure and high pressure fluid, the cylinder being connected for discharge selectively through a restrictor and through an unrestricted conduit to drain, the unrestricted conduit being operative and the cylinder being connected to the source of low pressure fluid as the wheel approaches the workpiece and before engagement therewith, e. a switch operable during the said relative movement to make the restrictor operative with the cylinder at approximately the same time that the wheel makes engagement with the workpiece, and f. a timer which is started by the switch and which, after a predetermined interval of time, changes the connection of the cylinder from the source of low pressure fluid to the source of high pressure fluid.

Claim 4

Dependent Claim 227 words

A grinding machine for generating a surface of revolution on a workpiece, comprising a. a base, b. a workhead table mounted on the base and adapted to carry the workpiece and rotate it about the axis of the surface of revolution, c. a wheelhead table mounted on the base and adapted to carry a wheelhead in which is rotatably mounted a spindle having an abrasive wheel mounted thereon, d. a hydraulic cylinder connecting the base to one of the tables to produce relative movement between the tables to cause engagement of the abrasive wheel and the workpiece for a grinding operation, the cylinder being connected selectively to sources of low pressure and high pressure fluid, the cylinder being connected for discharge selectively through a restrictor and through an unrestricted conduit to drain, the unrestricted conduit being operative and the cylinder being connected to the source of low pressure fluid as the wheel approaches the workpiece and before engagement therewith, e. a switch operable during the said relative movement to make the restrictor operative with the cylinder at approximately the same time that the wheel makes engagement with the workpiece, and f. a timer which is started by the switch and which, after a predetermined interval of time, changes the connection of the cylinder from the source of low pressure fluid to the source of high pressure fluid.

Claim 5

Dependent Claim 84 words

A grinding machine as recited in claim 1 wherein the switch consists of two levers mounted for hinged movement about the same axis, the levers lying face-to-face for sliding movement relative to one another, wherein one of the levers is engaged on occasion by the said one of the tables and is moved thereby relative to the other lever to produce a switching motion, further movement of the said one of the levers in this way causing the other lever to move with it.

Claim 6

Dependent Claim 59 words

A grinding machine as recited in claim 2, wherein the other lever is provided with two spaced abutments, the said one of the levers lying on the said other lever and capable of swinging movement relative thereto only between the two abutments, one of the abutments acting as a switching contact and the other acting as a mechanical stop.

Claim 7

Dependent Claim 58 words

A grinding machine as recited in claim 3, wherein a hydraulic cylinder is provided to return the two levers to an initial position after a grinding cycle has been completed, a spring lying between the said other abutment and the said one of the levers to maintain it normally in contact with the said one of the abutments.

Claim 8

Dependent Claim 41 words

A grinding machine as recited in claim 4, wherein the said other of the levers rests on a broad surface with substantial friction to maintain it in a given position to which it has been moved during a particular grinding cycle.

Claim 9

Dependent Claim 61 words

A grinding machine as recited in claim 1, wherein the cylinder is provided with a piston having a tubular piston rod, a solid rod extends coaxially through the tubular piston rod and is connected to it at one end only, the other end of the solid rod extending outwardly of the tubular piston rod and is attached to the wheelhead table.

Claim 10

Dependent Claim 28 words

A grinding machine as recited in claim 6, wherein the solid rod is provided with a substantially reduced portion adjacent the point of attachment to the wheelhead table.

Claim 11

Dependent Claim 52 words

A grinding machine as recited in claim 6, wherein the tubular rod passes through a bore in a hub located at each end of the cylinder, the space between the tubular rod and the surfaces of the bores being provided with fluid from the interior of the cylinder to form hydrodynamic bearings.

Claim 12

Dependent Claim 191 words

A grinding machine, comprising: a. a base, b. a workhead table for carrying a workpiece mounted on the base, c. a wheelhead table for carrying an abrasive wheel mounted on the base, d. feed means bringing about relative movement between the tables to cause engagement of the abrasive wheel and the workpiece for a Primary grinding operation, the feed means including an actuator for producing selectively a high speed and a low speed movement between the abrasive wheel and the workpiece, e. control means operative on the actuator to change from the high speed to the low speed at a preselected point in the said relative movement, the said point in the relative moevement at which the change from high speed to low speed during the said further grinding operation is automatically adjusted, so that the change takes place almost immediately before contact is made between the abrasive wheel and the workpiece, and f. means to produce a dressing operation if a predetermined size is not reached in a predetermined interval of grinding at high force and to produce a further grinding operation at high force after the said dressing operation.

Claim 13

Dependent Claim 191 words

A grinding machine, comprising: a. a base, b. a workhead table for carrying a workpiece mounted on the base, c. a wheelhead table for carrying an abrasive wheel mounted on the base, d. feed means bringing about relative movement between the tables to cause engagement of the abrasive wheel and the workpiece for a Primary grinding operation, the feed means including an actuator for producing selectively a high speed and a low speed movement between the abrasive wheel and the workpiece, e. control means operative on the actuator to change from the high speed to the low speed at a preselected point in the said relative movement, the said point in the relative moevement at which the change from high speed to low speed during the said further grinding operation is automatically adjusted, so that the change takes place almost immediately before contact is made between the abrasive wheel and the workpiece, and f. means to produce a dressing operation if a predetermined size is not reached in a predetermined interval of grinding at high force and to produce a further grinding operation at high force after the said dressing operation.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1976-02-06	1976-08-07	1977-02-06	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1980-02-06	1980-08-07	1981-02-06	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1984-02-06	1984-08-07	1985-02-06	$7700.00	Window Closed / Lapsed

Grinding machine with size controlled dressing means

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