US2937015A - Cutter bar tensioning means - Google Patents

Cutter bar tensioning means Download PDF

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Publication number
US2937015A
US2937015A US725602A US72560258A US2937015A US 2937015 A US2937015 A US 2937015A US 725602 A US725602 A US 725602A US 72560258 A US72560258 A US 72560258A US 2937015 A US2937015 A US 2937015A
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Prior art keywords
chain
cutter
jib
cylinder
plunger
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US725602A
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Jerrit George
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Mavor and Coulson Ltd
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Mavor and Coulson Ltd
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C25/00—Cutting machines, i.e. for making slits approximately parallel or perpendicular to the seam
    • E21C25/22—Machines slitting solely by one or more cutter chains moving unidirectionally along jibs
    • E21C25/28—Chains or chain guides
    • E21C25/30—Chain guides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B17/00—Chain saws; Equipment therefor
    • B27B17/14—Arrangements for stretching the chain saw

Definitions

  • This invention relates to machines for mining coal and other minerals and of the type known as cutter-chain coal-cutters.
  • a mining machine of this type an endless cutter chain is supported and guided by a jib which extends outwards like an arm from one side of the body of the machine, the chain being led around a powerdriven sprocket wheel in the machine body and being led around a guide at the free end of the jib.
  • the object of the present invention is to provide improved means for extending the jib sothat the cutter chain can be tensioned simply, quickly and effectively and for contracting the jib to slacken the cutter chain.
  • the invention is a mining machine of the cutter-chain type in which the jib has a cylinder-and-plunger device which has a normally closed inlet for the admission of fluent matter under pressure and which is extended by such matter, when admitted, to extend the jib and so increase the thrust applied by the jib to the cutterchain and is contractible to slacken the chain by opening the inlet.
  • Fig. 1 is a plan of the jib showing it partly broken away and in simplified form, constructional details not directly involved in the present invention being omitted.
  • Fig. 2 is a sectional plan, drawn to a larger scale, of the cylinder-and-plunger device.
  • Fig. 3 is a cross-section on the line HIIII of Fig. 2.
  • Fig. 1 there is shown, in simple outline, a portion of the body of the cutter-chain type-mining machine which incorporates the cutter-chain jib.
  • the body has a turret 11 that is rotatable about its central vertical axis and encloses a power-driven sprocket 12 which drives the cutter chain.
  • the chain itself consists as usual of inter-linked blocks 13 formed with sockets 14 in which cutter picks 15 are secured. In Fig. 1 only a few of these parts 13 to 15 are shown, the circuit of the picks being indicated by the dash-dot line 16.
  • the structure of the cutter-chain jib comprises as usual two components, namely: a wide heavy support bar which extends outwards from, being bolted to, the turret 11 in the body of the machine; a jib frame 21 having side members 22 which are a sliding fit along opposite sides of the bar 20 and which serve as straight side guides for the cutter-chain blocks 13.
  • the bar 20 extends radially from the power-driven sprocket 12, which is coaxial with the turret.
  • the jib frame is provided with a cutter-chain guide 23 at its free end, this guide in the example consisting of a normally stationary wheel which can be turned from time-to-time as it becomes worn with United States Patent'O use.
  • the cutter chain is led in an endless sion and can be caused or permitted to slideinwards in order to slacken the chain.
  • the jib frame 21 is fitted with a cylinder-and-plunger pressure device the axis of which is' the longitudinal axis of the jib and by means of which the operator is enabled to force the frame outwards inorder to extend the jib and so increase the chain tension and is enabled to cause the frame to be returned inwards in order to contract the jib and so slacken the chain.
  • a cylinder-and-plunger pressure device the axis of which is' the longitudinal axis of the jib and by means of which the operator is enabled to force the frame outwards inorder to extend the jib and so increase the chain tension and is enabled to cause the frame to be returned inwards in order to contract the jib and so slacken the chain.
  • the cylinder is formed in a block 31 with side wings 32 which fit into complemental recesses 33 in the frame side members 22.
  • the block 31 is secured to the frame 21 by a heavy screw 31A.
  • the plunger 34 is a simple free body of cylindrical form which fits into and mates with the cylinder and projects from it, the projecting end of the plunger being rounded at 35 so as to be suitable for applying a heavy thrust to the support bar 20, against which the plunger abuts.
  • the interior end of the cylinder is enlarged to form a compartment 36 into which a duct 37 opens.
  • This duct is formed in one of the cylinderblock wings 32 and has a lateral extension 38 which registers with a duct 39 through the jib frame 21.
  • This duct 39 leads from a fitting 40 which is screwed into the month of the duct and which is fitted internally with a non-return spring-pressed ball valve 41 and with a nipple 42 for a grease gun.
  • the fitting 40 and nipple 42 are enclosed in a recess 43 provided for them in the jib frame 21.
  • This recess normally is closed by a cap 44 screwed into it; removal of this cap exposes the nipple 42 to the operator.
  • the ducts 39, 38, 37 constitute an inlet passage from the recess 43 to the cylinder 30 and that the fitting 40, with its valve 41, constitutes means serving normally to close said passage.
  • escape ducting consisting of an inlet duct 50 extending from the inner end of the plunger and lateral outlet ducts 51 which branch from the duct 50 to the cylindrical surface of the plunger.
  • the cylinder 30, compartrnent 36 and ducts. 37, 39, 50 and 51 are packed tight with grease, so that the plunger 34 is pressed hard against the support bar 20.
  • the jib frame 21 is thrust outwards against the reaction of the bar 20, and the cutter chain 1315 is tensioned.
  • the operator removes the cap 44. If the tension has to be increased he applies a grease gun to the nipple 42 and forces into the cylinder block 31 as much more grease as may be necessary, so that the device is extended and the jib is equally extended. If instead the chain has to be slackened he unscrews the fitting 43 so that grease will be discharged from the cylinder block.
  • the ducting 50, 51 serves as an escape port defining the limit of the plungers movement during extension of the cylinder-and-plunger device. That is to say, if the plunger is forced outwards (i.e. towards the right as viewed in Figs. 1 and 2) so far that the lateral ducts 51 move beyond the cylinder 30, the grease is discharged as quickly as it is pumped in by the grease gun, so that movement of the plunger ceases.
  • a mining machine of the cutter-chain type comprising in combination a body, a turret that is rotatable on the body, a power-driven sprocket in the body co-axial with the turret, a cutter-chain jib composed of two ,components, namely an inner component and an outer component one of which is slidable longitudinally relative to the other and the inner of which extends from the turret so as to be rotatable therewith, the outer component having an end guide, an endless cutter chain led around said sprocket and said end guide, a cylinder secured internally within one of said components, a recess in said one of the components, a plunger which mates with the cylinder and which extends from the cylinder and thrusts against the other component, an inlet passage extending from said recess into the cylinder, and means enclosed (in said recess and normally closing said passage but movable to admit fluent matter under pressure through said passage into the cylinder to increase the thrust of the plunger against
  • a mining machine in which the means normally closing the inlet passage is fitted with a non-return valve and includes a nipple for a grease gun.
  • a mining machine according to claim 1 and including a cap which closes the recess. 7
  • a mining machine of the cutter-chain type comprising in combinationa body, a turret that is rotatable on the body, a power-driven sprocket in the body co-axial with the turret, a cutter-chain jib composed of two components, namely an inner component and an outer component one of which is slidable longitudinally relative to the other and the inner of which extends from the turret so as to be rotatable therewith, the outer component having an end guide, an endless cutter chain led around said sprocket and said end guide, a cylinder secured internally Within one of said components, a recess in said one oi the components, a plunger which mates with the cylinder and which extends from the cylinder and thrusts against the other component, said plunger being a simple cylindrical body which is free at both ends and which projects from the cylinder to form a one-way connection with the component against which it thrusts, an inlet passage extending from said recess into the cylinder, and means enclosed in said
  • a mining machine in which the means normally closing the inlet passage is fitted with a non-return valve and includes a nipple for a grease gun.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Lubricants (AREA)
  • Actuator (AREA)

Description

May 17, 1960 G. JERRlT 2,
CUTTER BAR TENSIONING MEANS Filed Aprill, 195s 2 Sheets-Sheet 2 FIG. 3.
a k/(m $324M m A ttorneys,
CUTTER BAR TENSIONHWG George Jerrit, Glasgow, Scotland, assignor to'Mavor &
This invention relates to machines for mining coal and other minerals and of the type known as cutter-chain coal-cutters. In a mining machine of this type, an endless cutter chain is supported and guided by a jib which extends outwards like an arm from one side of the body of the machine, the chain being led around a powerdriven sprocket wheel in the machine body and being led around a guide at the free end of the jib.
In a mining machine of the type stated provision is made for increasing the tension of the cutter chain from time to time as the chain becomes worn with use and for slackening the chain whenever the operator has to remove it or if he has overtightenedit.
The object of the present invention is to provide improved means for extending the jib sothat the cutter chain can be tensioned simply, quickly and effectively and for contracting the jib to slacken the cutter chain.
The invention is a mining machine of the cutter-chain type in which the jib has a cylinder-and-plunger device which has a normally closed inlet for the admission of fluent matter under pressure and which is extended by such matter, when admitted, to extend the jib and so increase the thrust applied by the jib to the cutterchain and is contractible to slacken the chain by opening the inlet.
It is of practical convenience to use grease as the fluent matter by which the device is operated, although lubrieating or other liquid might be used instead.
An example of a cutter-chain jib embodying the invention is shown in the accompanying drawings, in which:
Fig. 1 is a plan of the jib showing it partly broken away and in simplified form, constructional details not directly involved in the present invention being omitted.
Fig. 2 is a sectional plan, drawn to a larger scale, of the cylinder-and-plunger device.
Fig. 3 is a cross-section on the line HIIII of Fig. 2.
In Fig. 1 there is shown, in simple outline, a portion of the body of the cutter-chain type-mining machine which incorporates the cutter-chain jib. As shown, the body has a turret 11 that is rotatable about its central vertical axis and encloses a power-driven sprocket 12 which drives the cutter chain. The chain itself consists as usual of inter-linked blocks 13 formed with sockets 14 in which cutter picks 15 are secured. In Fig. 1 only a few of these parts 13 to 15 are shown, the circuit of the picks being indicated by the dash-dot line 16.
In the example, the structure of the cutter-chain jib comprises as usual two components, namely: a wide heavy support bar which extends outwards from, being bolted to, the turret 11 in the body of the machine; a jib frame 21 having side members 22 which are a sliding fit along opposite sides of the bar 20 and which serve as straight side guides for the cutter-chain blocks 13. The bar 20 extends radially from the power-driven sprocket 12, which is coaxial with the turret. The jib frame is provided with a cutter-chain guide 23 at its free end, this guide in the example consisting of a normally stationary wheel which can be turned from time-to-time as it becomes worn with United States Patent'O use. Thus, as usual, the cutter chain is led in an endless sion and can be caused or permitted to slideinwards in order to slacken the chain. I
The. parts of the example so far described are or may be of usual construction. 7
The jib frame 21 is fitted with a cylinder-and-plunger pressure device the axis of which is' the longitudinal axis of the jib and by means of which the operator is enabled to force the frame outwards inorder to extend the jib and so increase the chain tension and is enabled to cause the frame to be returned inwards in order to contract the jib and so slacken the chain.
The cylinder is formed in a block 31 with side wings 32 which fit into complemental recesses 33 in the frame side members 22. The block 31 is secured to the frame 21 by a heavy screw 31A. The plunger 34 is a simple free body of cylindrical form which fits into and mates with the cylinder and projects from it, the projecting end of the plunger being rounded at 35 so as to be suitable for applying a heavy thrust to the support bar 20, against which the plunger abuts. The interior end of the cylinder is enlarged to form a compartment 36 into which a duct 37 opens. This duct is formed in one of the cylinderblock wings 32 and has a lateral extension 38 which registers with a duct 39 through the jib frame 21. This duct 39 leads from a fitting 40 which is screwed into the month of the duct and which is fitted internally with a non-return spring-pressed ball valve 41 and with a nipple 42 for a grease gun. The fitting 40 and nipple 42 are enclosed in a recess 43 provided for them in the jib frame 21. This recess normally is closed by a cap 44 screwed into it; removal of this cap exposes the nipple 42 to the operator. Thus, it will be apparent that the ducts 39, 38, 37 constitute an inlet passage from the recess 43 to the cylinder 30 and that the fitting 40, with its valve 41, constitutes means serving normally to close said passage.
Seeing that the duct 37 is drilled from the exterior of the wing 32 in which it is provided, the mouth of the duct is blocked by a plug 45 secured by a weld 46.
The extent of outward movement of the plunger 34 from the cylinder 30 is limited by escape ducting consisting of an inlet duct 50 extending from the inner end of the plunger and lateral outlet ducts 51 which branch from the duct 50 to the cylindrical surface of the plunger.
When the coal-cutter is in use, the cylinder 30, compartrnent 36 and ducts. 37, 39, 50 and 51 are packed tight with grease, so that the plunger 34 is pressed hard against the support bar 20. By this means the jib frame 21 is thrust outwards against the reaction of the bar 20, and the cutter chain 1315 is tensioned. In order either to increase the tension or-slacken the chain the operator removes the cap 44. If the tension has to be increased he applies a grease gun to the nipple 42 and forces into the cylinder block 31 as much more grease as may be necessary, so that the device is extended and the jib is equally extended. If instead the chain has to be slackened he unscrews the fitting 43 so that grease will be discharged from the cylinder block.
The ducting 50, 51 serves as an escape port defining the limit of the plungers movement during extension of the cylinder-and-plunger device. That is to say, if the plunger is forced outwards (i.e. towards the right as viewed in Figs. 1 and 2) so far that the lateral ducts 51 move beyond the cylinder 30, the grease is discharged as quickly as it is pumped in by the grease gun, so that movement of the plunger ceases.
parts as regards manufacture and incorporation in a coalcutter, even an existing coal-cutter, and the simplicity and quickness by which the cylinder-and-plunger device can be operated. These advantages are especially 'important in the case of a jib of complex structure, notably a jib which is one of two or more superposed jibs.
I claim:
1. A mining machine of the cutter-chain type comprising in combination a body, a turret that is rotatable on the body, a power-driven sprocket in the body co-axial with the turret, a cutter-chain jib composed of two ,components, namely an inner component and an outer component one of which is slidable longitudinally relative to the other and the inner of which extends from the turret so as to be rotatable therewith, the outer component having an end guide, an endless cutter chain led around said sprocket and said end guide, a cylinder secured internally within one of said components, a recess in said one of the components, a plunger which mates with the cylinder and which extends from the cylinder and thrusts against the other component, an inlet passage extending from said recess into the cylinder, and means enclosed (in said recess and normally closing said passage but movable to admit fluent matter under pressure through said passage into the cylinder to increase the thrust of the plunger against the associated component to tension the cutter chain.
2. A mining machine according to claim 1 in which the means normally closing the inlet passage is fitted with a non-return valve and includes a nipple for a grease gun.
3. A mining machine according to claim 1 and including a cap which closes the recess. 7
4. A mining machine of the cutter-chain type comprising in combinationa body, a turret that is rotatable on the body, a power-driven sprocket in the body co-axial with the turret, a cutter-chain jib composed of two components, namely an inner component and an outer component one of which is slidable longitudinally relative to the other and the inner of which extends from the turret so as to be rotatable therewith, the outer component having an end guide, an endless cutter chain led around said sprocket and said end guide, a cylinder secured internally Within one of said components, a recess in said one oi the components, a plunger which mates with the cylinder and which extends from the cylinder and thrusts against the other component, said plunger being a simple cylindrical body which is free at both ends and which projects from the cylinder to form a one-way connection with the component against which it thrusts, an inlet passage extending from said recess into the cylinder, and means enclosed in said recess and normally closing said passage but movable to admit fluent matter under pressure through said passage into the cylinder to increase the thrust of the plunger against the associated component to tension the cutter chain.
5. A mining machine according to claim 4 in which the means normally closing the inlet passage is fitted with a non-return valve and includes a nipple for a grease gun.
References Cited in the file of this patent UNITED STATES PATENTS 1,857,376 Hoy May 10, 1932 1,876,024 Rosenberry Sept. 6, 1932 1,931,560 Simmons Oct. 24, 1933 2,635,583 Bill Apr. 21, 1953 2,788,883 Schwenk Apr. 16, 1957 2,818,311 Ashley Dec. 31, 1957
US725602A 1957-04-09 1958-04-01 Cutter bar tensioning means Expired - Lifetime US2937015A (en)

Applications Claiming Priority (1)

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GB11458/57A GB860787A (en) 1957-04-09 1957-04-09 Improvements relating to cutter-chain machines for mining coal and other minerals

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FR (1) FR1194328A (en)
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NL (2) NL97741C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4080001A (en) * 1976-10-13 1978-03-21 Dresser Industries, Inc. Take-up for mining machine trim chain

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4626032A (en) * 1984-06-18 1986-12-02 Harris Jesse W Rock ditcher

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1857376A (en) * 1929-08-07 1932-05-10 Sullivan Machinery Co Mining machine
US1876024A (en) * 1930-04-07 1932-09-06 Silver King Hydraulic Jack Com Hydraulic jack
US1931560A (en) * 1932-05-12 1933-10-24 Sullivan Machinery Co Mining machine
US2635583A (en) * 1949-10-21 1953-04-21 Robert O Bill Pressure fluid motor and combined telescopic guide and housing therefor
US2788883A (en) * 1954-02-01 1957-04-16 Bernard E Schwenk Belt adjuster
US2818311A (en) * 1956-03-19 1957-12-31 Int Harvester Co Hydraulic track tensioning apparatus for crawler type land vehicles

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1857376A (en) * 1929-08-07 1932-05-10 Sullivan Machinery Co Mining machine
US1876024A (en) * 1930-04-07 1932-09-06 Silver King Hydraulic Jack Com Hydraulic jack
US1931560A (en) * 1932-05-12 1933-10-24 Sullivan Machinery Co Mining machine
US2635583A (en) * 1949-10-21 1953-04-21 Robert O Bill Pressure fluid motor and combined telescopic guide and housing therefor
US2788883A (en) * 1954-02-01 1957-04-16 Bernard E Schwenk Belt adjuster
US2818311A (en) * 1956-03-19 1957-12-31 Int Harvester Co Hydraulic track tensioning apparatus for crawler type land vehicles

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4080001A (en) * 1976-10-13 1978-03-21 Dresser Industries, Inc. Take-up for mining machine trim chain

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FR1194328A (en) 1959-11-09
NL97741C (en)
GB860787A (en) 1961-02-08
BE566448A (en)
NL226666A (en)

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