US785015A - Pneumatic setting-machine for sawmill-carriages. - Google Patents

Description

No. 785,015. PATENTED MAR.14,19 05.

A. H. MASTERS.

PNEUMATIUSETTING MACHINE FOR SAWMILL GARRIAGES.

' APPLICATION FILED JULY 29. 1904.

3 SHEETS-SHEET 1.

i il'weufoz PATENTED MAR. 14, 1905,

H. MASTERS. I PNEUMATIC SETTING MACHINE FOR SAWMILL OARRIAGES.

APPLIUATION FILED JULY 29. 1904.

3 SHEETSSHEET 2.

Witmeaoua No. 785,015. PATENTEDMAR.14,1905.

\ A. H. MASTERS.

PNEUMATIC SETTING MACHINE FOR SAW I L GARRIAGES.

APPLIOATION FILED JULY 29. 1904.

s sinus-MEET a.

j asfazzs;

attqmnu I NITED STATES Patented March 14., 1905.

PATENT OFFICE.

PNEUMATIC SETTING-MACHINE FOR SAWMILL-CARRIAGES.

SPECIFICATION forming part of Letters Patent No. 785,015, dated March 14, 1905.

' Application filed July 29,1904. Serial No. 218,729.

To all whom, it may concern.-

Be it known that I, ALEXANDER H. MASTERS, a citizen of the United States, residing at Greensboro, in the county of Guilford and State of North Carolina, have invented new and useful Improvements in Pneumatic Setting Machines for Sawmill Carriages, of

which the following is a specification.

The invention relates to an improvement in sawmill machinery, particularly a handcontrolled pneumatic setting-machine for sawmill-carriages.

The main object of the invention is the provision of power-driven setting-machines arranged to be manually controlled to regulate the handling of the logs and gaging the thickness of lumber to be cut.

The preferred embodiment of the details of the invention are illustrated in the accompanying drawings, wherein Figure 1 is a view in elevation of the setting-machine constructed in accordance with my invention, one side of the casing being removed. v Fig. 2 is a longitudinal section of the same. Fig. 3 is a view in elevation of the machine, showing a retarding-cylinder for the piston, said cylinder and also the powercylinder being in section. Fig. 4 is a plan view, partly in section, illustrating a modified means for regulating the movement of the piston. Fig. 5 is an end elevation of the same.

Referring to the drawings, 1 represents a base, preferably of metal, and designed to be secured to the usual sawmill carriage. A casing 2 is supported at one end of the base, being approximately circular in vertical section and having vertical sides 3. A powercylinder 4 is secured to one end of the casing,

being supportedon the base by brace-bars 5, projecting from the opposite end of the cylinder, said brace-bars being arranged in parallel relation and suitably spaced apart to permit operation of the parts hereinafter described.

6 represents a piston operative within cylinder 4, the piston-rod 7 of which projects between the brace-bars 5, being supported in suitable bearings 8, secured to or formed integral with the cylinder L and brace-bars 5.

A shaft 9 is mounted in the side walls 3 of the casing 2, extending transversely of said 1 casing and being supported in suitable bearings 10, as shown in Fig. 2. 11 represents a ratchet-wheel keyed upon shaft 9 and formed on its edge with spur-teeth 12, said teeth extending peripherally of the wheel.

14 represents a cross-head fixed on pistonrod 7 and carrying links 15, centrally secured to the head and projecting vertically therefrom in both directions. Arm 16, respectively pivoted to the links above and below the cross-head, are attached at their opposite ends to pawl-levers 17. The inner end of each lever 17 is loosely mounted on shaft 9 contiguous the ratchet-wheel 11 and carry at their outer ends double pawls 18, arranged for engagement with teeth 12.

It will be understood that, as shown in the drawings, there are two arms 16, one above the other, below the piston-rod 7, and hence two arms 17, projecting in approximately opposite directions from shaft 9, and two pawls 18, one end of each of which is adapted for cooperation with its adjacent set of ratchetteeth.

19 represents a valve-chest securedat one side of the cylinder L and having ports 20 leading from said chest to opposite ends of the power-cylinder.

21 represents a supply-pipe communicating centrally with said valve-chest, and 22 22 represent exhaust-pipes communicating with the valve-chest at opposite ends thereof. Both the exhaust-pipes feed to a single pipe 23 below the valve-chest, in which latter pipe a suitable valve 2 L is placed for a purpose hereinafter stated. Within the valve chest is mounted a valve 25, having enlarged ends 26 and a reduced intermediate portion 27. The ends 26 operate as closures forthe inlet and exhaust, the valve being of such length as to simnltaneousl y cut off both ports 20 when desired. The valve is manually operable through the medium of a handle 27, arranged exteriorly of the valve-chest, and any desired intermediate gearing to accomplish a sliding movement of the valve in the operation of the handle.

In the use of the device the operator, by the proper manipulation of handle 27, may

cause the power fluid entering valve-chest 19 through inlet 21 to pass through either port to operate the piston as desired, it being noted that when the valve is arranged to admit power to one side of the piston the exexhaust 22 contiguous the port 20 at the opposite end of the cylinder is open to permit necessary exhaust.

From the construction described it will be noted that the reciprocatory movement of the cross-head operates to continuously drive the ratchet 11 in one direction, and to transmit said movement to the head-block of the sawcarriage I provide a vertically-arranged shaft 29, supported in suitable bearings on one side of the casing 2 and carrying at its upper end a bevel-gear to engage a bevel-gear 31, fixed on a projecting end of shaft 9. The lower end of shaft 29 carries a gear 32, designed to be operatively connected with the knees or knee-operating shaft of the sawmillcarriage, as is usual.

To provide means for limiting the movement of piston 6, and thereby limit the revolution of ratchet-wheel l1 and control the movement of the knees of the head-block, I provide a lever 33, bifurcated at its lower end, as at 34, to straddle the piston-rod 7 beyond the cross-head 14. The lever is pivoted at its lower end to the base 1 and is provided at its upper end with the usual ratchet-and-pawl mechanism for locking the lever in adjusted position. The teeth or ratchet mounted in the usual quadrant 36, supported from the base 1, may be arranged to have a definite relation to the desired adjustment of the knees hereinbefore referred to, or the side of quadrant may be suitably divided by indicatingmarks to regulate the adjustment. By moving the lever the bifurcated end may be arranged to contact with the cross-head 14 and limit its movement, thus of course limiting the revolution of ratchet-wheel '11 and controlling the movement of the knees.

By operating valve 24 to retard the exhaust from the valve-chest I am enabled to utilize said exhaust as a cushioning means to receive the pressure of the piston, as will be evident.

In Fig. 3 I have illustrated an additional means for cushioning the. piston, comprising a retarding-cylinder 37, supported on the base 1 in alinement with the piston-rod and arranged to contain oil or other suitable fluid. The piston-rod 7 carries a head or auxiliary piston 38, operative within the cylinder 37. An external by-pass 39, communicating with the cylinder at opposite ends and carrying the valve 40, serves to permit the How of the fluid under pressure from the piston 38.

It may be found desirable to provide means for limiting the movement of cross-head 14 in both directions, and in Figs. 4 and 5 I have illustrated adjustable mechanism for this purpose. Referring particularly to said figures, 41 and 42 represent rods supported at one end v in the cylinder-head 4 and at the opposite ends in the base 1. The rods are arranged in horizontal alinement and are threaded contiguous the cylinder 4, asat 43, and oppositely threaded at 44 on their remote ends. Blocks 45 are arranged one on each side the cross head 14, engaging, respectively, with the threaded portions 43 and 44 of the rods 42. The free end of each of the rods 42 is provided with a gear 46, arranged for continuous engagement with an internal gear 47, having handles 48 and rznounted for revolution upon the pistonrod From the construction shown it is evident that revolution of the gear 47 will adjust the blocks 45 from or toward each other, increasing'or decreasing the throw of the piston-rod 7 and limiting the revolution of the ratchet- Wheel 11.

The pawls 18 are, as above described, doubleended-that is, having oppositely-projected operating ends, as clearly shown in Fig. l. The respective ends of the pawl are disposed out of alinement, being arranged so that the respective ends are adapted for operative engagement with opposite ends of teeth 12. The double pawl is balanced, being arranged so that either end may be manually moved into operative engagement with the teeth. From this construction it will be seen that the engagement of one end of each pawl with one end of the teeth will cause a continuous movement of ratchet-wheel 11 during the full reciprocation of piston-rod 7, while the engagement of the opposite ends of the pawls with the other ends of the teeth Will revolve Wheel 11 in a reversedirection during movement of the piston. I have thus provided for a direct and reverse movement of the ratchet-wheel to completely govern the movement of the head-block. I I

The setting-machine described is particularly adapted for operation by compressed air, and I prefer such motive fluid, as it may be conveniently delivered from a storage-cylinder or from a pump, avoiding the condensation and heating effect and other disadvantages resulting from the use of steam.

Having thus described the invention, what is claimed as new is- 1. A pneumatic setting-machine for sawmill-carriages,a base, a powerwheel,a reciprocating piston, across-head on the piston, means for connecting the cross-head and power-wheel to impart motion to the latter, and means arranged on opposite sides of the cross-head and connected for simultaneous adjustment to control the degree of movement of the piston in both directions.

2. A pneumatic setting-machine for sawmill-carriages, a base, a power-wheel mounted on the base, a reciprocating piston, a crosshead on the piston, means for connecting the cross-head and power-wheel to impart motion to the latter, a rod, means carried by said rod and arranged on each side of the cross-head, and means for operating said rod to simultaneously adjust the means carried by the rod to control the degree of movement of the piston in both directions.

3. A pneumatic setting-machine for sawmill-carriages, a power-Wheel, a reciprocating piston, means for connecting the piston and power-Wheel to impart motion to the latter, and means arranged for simultaneous adjustment to control the degree of movement of the piston in both directions.

4. A pneumatic setting-machine for sawmill-carriages, a power-Wheel, a power-driven piston, means for connecting the piston and power-Wheel to impart motion to the latter, a rod, means carried by said rod'and adapted to control the degree of movement of the piston in both directions. and means for operating said rod to simultaneously adjust the means carried by the rod.

5. A pneumatic setting-machine for saw mill-carriages, a base, a power-wheel mounted on the base, a reciprocating piston, a crosshead carried by the piston, means to connect the cross-head and the power-Wheel to impart motion to the latter, rods having threaded portions, blocks movable on said threaded portions and arranged on each side of the crosshead, gears secured to said heads, an internal gear adapted to mesh with said first-named gears, and means arranged on said internal gear, whereby it may be operated to rotate the rods to adjust the blocks to limit the movement of the piston in both directions.

In testimony whereof I aflix my signature in presence of two Witnesses.

ALEXANDER H. MASTERS.

Witnesses:

Ron'r. E. DAvIDs, MACE L. MASTERS.

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