US408293A

US408293A - dalrymple

Info

Publication number: US408293A
Authority: US
Publication date: 1889-08-06
Anticipated expiration: 1906-08-06

Description

2 SheetS- Sheet 1.

(No Model.)

G. DALRYMPLE. MACHINE FOR SAWING STONE No. 408,293. Patented Aug. 6, 1889.

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(No Model.) 2 Shets-Sheet 2.. G. DALRYMPLE.

MACHINE FOR SAWING STONE.

N0. 408,293. Patented Aug. 6, 1889.

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UNITED STATES PATENT Orricn.

GEORGE DALRYMPLE, OF FAIR HAVEN, VERMONT.

MACHINE FOR SAWING STONE.

SPECIFICATION forming part of Letters Patent No. 408,293, dated August 6, 1889. Application filed .513 1, 1889. Serial No. 309,199. (No model.)

To all whom it may concern.-

Be it known that I, GEORGE DALRYMPLE, of Fair Haven, in the county of Rutland and State of Vermont, have invented new and useful Improvements in Machines for Sawing Stone, of which the following is a specification.

My invention relates to improvements in machines for sawing stone; and it consists of new and novel combinations of parts of said machines, whereby the construction is Sllllplified and rendered more effective.

In the accompanying drawings, which are herein referred to and form part of this specification, Figure 1 is an end elevation of a machine in which my invention is embodied, the pitman and driving mechanism by which said machine is operated being omitted therefrom. Fig. 2 is a side elevation of the same on a reduced scale. Fig. 3 is a detached front elevation of the automatic gripping device for preventing the saw-frame from being forced upwardly. Fig. at is a side elevation of the lower end of one of the vibratile rods which connect the saw-frame to the cross: heads, one side of the lubricator-box being removed to show the construction of the working parts of the joint; and Fig. 5 is an e11- larged perspective view of the grooved and perforated sleeve used in forming the joint for the lower end of said vibratile rods.

As represented in the drawings, A designates the frame work of the machine, of which the lower part is omitted as unnecessary for this description, as that part does not embrace any part of my invention. To the end posts of said frame-work are secured guide-rods B, which are preferably formed of cylindrical bars that are arranged in pairs parallel to each other, and are held at sufficient distance from the face of said end posts to permit the sleeve-like ends of the crossheads to have ample room between said guide rods and the faces of the end posts to move freely.

0 represents the cross-heads, to which the saw-frame D is suspended by means of peudulous rods E, which are j ournaled at their upper end to said cross-heads by joint-boxes F, and are journaled at their lower end to said saw-frame by knuckle-joints G. The crossheads 0 have at each end a sleeve II, which is fitted to slide freely on the guide-rod to which said sleeve is assigned. Each. of said cross-heads has on its upper side, adjacently to each sleeve II, a bracket I, to which a hoisting-rope J is attached for the purpose of lifting said cross-heads and their connected saw frame when occasion requires. Each bracket I is provided with a lug II, for a purpose hereinafter explained.

L is a sleeve or collar that is loosely fitted to slide freely on each of the guide-rods B, there being one of said collars to each of said guide-rods, and each collar being fitted on its appropriate guiderod 'to be slightly above the sleeve II, assigned thereto. Each collar L has projecting from one side lugs M, to which a lever N is loosely pivoted to swing in a vertical plane. The outer end of the lever N has a cam-shaped end 0, whose convex face is eccentric to the pivot of said lever, so that when the inner end of the latter is raised up the opposite end will have a gripping hold of the guide-rod on which it bears. The inner end of the levers N are fitted to engage upon the upper side of the lug K at the corresponding end of a crosshead 0, and thereby any tendency of the cross-heads to move upwardly, except in the manner hereinafter set forth, will be resisted and prevented by said levers becoming gripped to the guide-rods B. The inner portion of the lever N is bifurcated to span the vertical web of the bracket I, whereby said lever is retained in position to bear upon the lug K when occasion occurs to require such contact to be made.

A gravity-dog P is loosely pivoted to the collar L, so that when the latter is slightly raised, as shown in Fig. 3, the lower end of said dog will rest on the upper end of the cor responding sleeve H, thereby allowing the inner end of the lever N to fall sufficiently to free cam-shaped end 0 of said lever from its contact with the guide-rod B, with which it is fitted to oo-operate, and by so doing the cross-head is left free to be moved upwardly. The knuckle-joints G at the lower end of the pendulous rods E are each formed by a box Q, which contains a lubricant and is rigidly secured to the saw-frame D-one at each corner of said fram ea wrist-pin R, which passes transversely through the box Q and is rigidly ured therein, and a sleeve S, which is fitted to th wrist-pin R and whose outer diameter is ad to fit into the head T of said pendulous rods. Said sleeve is provided with a series of longitudinal grooves V, from which a series of perforations extend into the bore of said sleeve. The sleeve S while contained in the knuckle-joint is either partially or entirely submerged in the lubricant contained in the box Q, so that said lubricant will flow into the grooves V, and thence into the perforations leading therefrom, thereby keeping the wrist-pins R constantly and thoroughly lubricated. A cap or dust-guard \V is fixed over each box Q, for the purpose of preventing dirt and dust from settling into the lubricant contained in said box.

The hoisting-ropes J, of which there is one to each corner of the saw-frame D, pass over sheaves X, and from thence are carried to a drum-shaft Y, to which power may be applied to effect the winding up and unwinding of the hoisting-ropes J sin'lultaneously.

It being understood that the saw-frame is reciprocated horizontally in an endwise direction by any of the common and wellknown means for effecting that purpose in this class of. machinery, the operation of this invention is as follows: The saw-frame D is lowered to permit the saws in said frame to bear upon the top of the stone to be sawed. The dogs P are disengaged from their bearings on the sleeves H to allow the inner ends of the levers N to bear upon the lugs K and produce the gripping hold of the opposite ends of said levers upon the guide-rods B, whereby a rising movement of the saw-frame D is prevented. The lower ends of the pendulous rods E move in an arc of a circle, and thereby the saw-frame D will naturally be in a slightly-higher position at the termination of each phase of its stroke than it will when at its midway point. At these higher points of the movement of said saw-frame the upward pressure on the inner end of the levers N will become slightly slackened to permit the collars L to slip down to a slight degree on the guide-rods B. Then as the saw-frame approaches its midway position the levers N again grip the guide-rods B to prevent the saw-frame from rising, and thereby produce a comparatively rank cut of the saws into the stone, and in this manner the saws are automatically fed (.lowi'iwardly until they have passed entirely through the depth of the block of stone. The latter being accomplished, the saw-frame can be raised up, the separated parts of the stone removed, and another block of stone inserted in place ready for a repetition of the operation above described.

I am aware that heretofore stone-sawing machines have been constructed with automatic clamping devices for restraining an upward movement of the saw-frame; but these earlier devices were essentially different from the one herein described, and they were subject to rapid wear that soon rendered them of but little use. By my invention the defects of the ,others are remedied.

\Vhat I claim as my invention, and desire to secure by Letters Patent, is

1. In a stone-sawing machine, the combination of a saw-frame having a horizontal reciprocating motion in an endwise direction,

said saw-frame being suspended by pendu-- lous rods from cross-heads which are fitted to move vertically on guide-rods fixed at opposite ends of the machine, and clamping mechanisms which consist of collars fitted to slide loosely on said guide-rods, and each 001- lar having a lever that is loosely pivoted thereto, one end of said lever being fitted to bear upon a lug projecting from said crosshead and the opposite end of said lever being provided with a cam-face that will bite against a guide-rod and resist a rising movement of said saw-frame, as and for the purpose herein specified.

2. In a stone-sawing machine, the combination of a saw-frame suspended by pendulous rods from cross-heads which are fitted to receive a vertical movement on guide-rods at the opposite ends of the machine, said pendulous rods being journaled on said cross-heads and to said saw-frame, the joints of said pendulous rods with said saw-frame beingformed by each having a longitudinallygrooved and radially-perforated sleeve which is inserted in the lower head of said pendulous rods, a box for containing lubricant secured to said saw-frame and provided with a wrist-pin which fits the bore of said sleeve, the latter being submerged, either partially or entirely, in said lubricant, so that the latter will flow into the grooves and perforations of said sleeve, as and for the purpose herein specified.

GEORGE DALRYMPLE. Witnesses:

J. O. McCLURE, Ms. E. REID.