US2613923A - Pavement breaking machine - Google Patents

Description

Oct. 14, 1952 w. v. CORNETT 2,613,923

PAVEMENT BREAKING MACHINE Filed on. 24, 1946 4 Sheets-Sheet 1 INVENTOR. WALTER V. CORNETT BY v ATTORNEYS 1952 w. v. CORNETT PAVEMENT BREAKING MACHINE 4 Sheets-Sheet 2 Filed Oct. 24, 1946 INVENTOR. WALTER V. CORNETT A 7' TORNE VS Oct. 14, 1952 W. V. CORNETT PAVEMENT BREAKING MACHINE Filed Oct. 24, 1946 5 z S H 5 I 74 E] a; V

4 Sheets-Sheet 5 INVENTOR. WALTER v. CORNETT fl im A TTORNEJQ? Oct. 14, 1952 W. V. CORNETT PAVEMENT BREAKING MACHINE Filed Oct. 24, 1946 4 Sheets-Sheet 4 [NVEN TOR. WALTER l/ COR/VETT A T TORNE VS Patented Oct. 14, 1952 UNITED STATES PATENT OFFICE PAVEMENT BREAKING MACHINE Walter v. Cornett, Los Angeles, Calif.

Application October 24, 1946, Serial No. 705,446

Claims.. (01. 262-13) This invention relates to a machine for breaking concrete pavements and the like and has for its object improvements in the machine described in United States Patents 1,830,751 dated November 10, 1922, and 1,891,222 dated 'Deceme ber 20, 1932. Y

Another object is the provision of improved means for moving the turntable or movable frame carrying the hammer or impact tool used in machines of the class described.

Another object is the provision of an improved impact tool or hammer for use in machines of the class described.

Further objects will be apparent from the followingdescription and drawings wherein are shown by way of illustration, preferred embodiments of the invention. It will be understood, however, that many changes in the details of construction may be made, the invention being as defined by the appended claims.

In the accompanying drawings:

Figure 1 is a plan view of .the improved turntable construction embodying the invention with some of theiloor plates removed.

Figure -2 is a sectional view of the turntable on the line 2, 2 of Figure ,1;

Figure 3'is. a sectional view of the hammer or impact tool on the line 3, 3 of Figure 2; and

- Figure 4 is a side elevational view of the impact tool shown'in Figures 1 to 3 inclusive.

In the aforesaid U. S.Patent 1,891,222 is shown and described a pavement breaking machine comprising a suitable vehicle upon which all of the'mechanism is mounted so as to be readily transportable. Any desired type of vehicle may be used, but a self-propelled vehicle, such as an ordinary automobile truck is preferable. The term self -propelled is herein used to denote a vehicle having a complete power plant, such as the usual gasoline engine, as distinguishedv from a vehicle having an outside electric motor requiring power from an outside source.

As the details of the construction of the vehicle are of no importance in connection with the present invention, it will be sufiicient to point out that the numeral Ill denotes a suitable framework mounted on the vehicle and. secured to cross members II so as to be rigidly mounted thereon.

. This framework carries a circular track I2 upon which is mounted a turntable or elongated movable platform, I3 adapted to revolve around a center'jpivot or bearing I4 secured to the framework, jThe-details of the construction of thegmountii p fsuch a turntable are more fullydescribed in the aforesaid patents, and may be of any suitable construction that permits the turntable to be revolvably. mounted upon the chassis or framework of the truck.

In the instant invention the turntable I3 may consist of the longitudinally disposed members I5, I6, secured together by suitable cross members I1 and provided with an outer skirt-like casing I8 which surrounds the'entire turntable so as to partially enclose the working parts. The casing I8 is secured to the framework of the turntable by means of cap screws or bolts as indicated at 19.

The turntable I3 is provided with floor plates 20 which cover the upper surface of the table, the upper surfaces of members I5, I6 projecting therethrough.

The turntable is provided with a suitable number of rollers 2| secured to the turntable inany suitable manner and adapted to revolvably support the turntable on the track I2 so that it may revolve around the center bearing I4.

Mounted on the turntable I3 is a source of energy such as the air compressor 22, which may be driven by any suitable means such as'the gasoline engine 23. Extending from the air compressor is a delivery pipe 24 forthe purpose of delivering air from the .compressor to the op erating mechanism for moving the turntable and for operating the impact tool as presently described. As the details of construction of the compressor and the motor therefor are immaterial to the present invention, they are not described here in detail and it will also be noted that the motor and compressor may be mounted upon the framework I0 of the truck and may be positioned anywhere thereon, although the preferred construction is that herein described, wherein the source of compressed air such as the compressor 22 and its driving motor 23 move with the turntable.

Mounted upon the web or cross member 25 extending between the longitudinal members I5, [6 of the turntable, is a suitable compressed air motor- 26 having reduction gears 21 connected.

f eludes the drum 35 secured to a shaft 35 which in effect, forms anextension of the output shaft 28; The shaft 36 is supported in a bearing 3'].

mounted on one of the cross members I! as shown in Figure 2. The inner end of shaft 36 is supported in bearing 38 on another one of said cross members H.

Revolvably supported on the members l5, [6 of the turntable or on any convenient part thereof, are the sheave pulleys 39, 40, adapted to receive a cable 41 as indicated in Figure 1.

The outer ends of cable 4| are attached at 42 to the stationary circular cable drum portion 43,, Fig. .2, located on the framework 1.0 and forming a sheave-immediately below track l2. The oable 4| is wound about the drum 3.5 as generally indicated at M, so that when the drum 35 is revolved by the operation of the air motor '28 the entire turntable will be revolved about the center bearing 14 in a manner that will be obvious, the direction of revolution being dependent on the direction of the revolution of the motor 26 driving drum 35..

On the opposite end of the turntable from the apparatus for moving same as just described, is located a standard or pedestal 45 supporting the 'control mechanism for the turntable and the valve, the handle of whichis indicated at 47.. By

moving this handle in one direction, say to the right, the pipe 45 is connected through the valve to a'pipe 18 connected to the motor .26, causing same to revolve clockwise which may revolve the turntable clockwise looking down on Figure 1.

When the handle 4"! is moved to the left, the air supply pipe 46 is connected through the valve to the pipe 49 to cause the motor 26 to revolve counterclockwise, and thereby revolve the turntable anti-clockwise. This enables the left hand end of the turntable carrying the impact tool (to be presently described) to be moved about the center bearing I' l to assume various positions relative to the rear end of the truck on which it is mounted, as more fully shown and. described in the two patents aforementioned.

Anoperators seat, generally indicated by the numeral 59 may be spring-mounted in any desired manner on the turntable so that an operator seated thereon may be within .easy reaoh'of the handles i! and 82 of the control valves.

Any suitable type of impact tool or hammer can be mounted on the improved turntable structime just described. Such, for example, as the impact tools described in the patents heretofore mentioned. However, a preferred form of hammer is herein illustrated together-with means for. controlling same.

Referring now .to Figure 3, the longitudinal members [5 and Hi of the turntable project upwardly through theplates 20, and secured to these members in any suitable manner is the journal block 5| provided with bearing bushings 52 in which is supported a trunnion block 53.

The trunnion block has a pair of oppositely disposed cars 54, and on one side thereof has an outwardly extending portion or lug to which may be secured one end of the leaf spring 56, the outer end of said spring being secured in a slotted plate 51 on the turntable as shown, so that the outer end of the spring overlies a compression spring 58 and the tension of said last spring can be arranged' by adjusting bolt 59 to adjust the outer end of spring 56 to raise and lower same and thereby adjust the hammer assembly either way from a vertical position. This spring 56 yieldably supports the hammer assembly for limited movement about the axis of the journal block 5 I.

The trunnion block 53 has secured thereto the cylinder 60 .having the usual cylinder head 6! and containing a piston 62 of any suitable construction having secured thereto the piston rod 63 which extends downwardly through the bearing bushing 64 in the block 53.

Below the bearing 64 is located a suitable member 85 secured in the block 53 in order to provide a seat for the bearing.

Pushed inwardly from below the block '65 is a gland 66 which is split vertically along the center line 5! and the parts of the gland are .held together and in place by any suitable .means such as the apertured plate 68, said plate extending laterally as best seen in Figure 4 and being bored to receive the bolts 59 which pass through the plate and upwardly through the cars 54 of the block 53. These bolts are provided with the springs w and nuts and washers 1| by means of which, in a manner that will be obvious, the plate 68 carrying gland 66 is spring-pressed upwardly around thepiston rod 63, and, as the gland '65 is split as previously described, it can be easily removed and replaced without disassembling any parts of the device except the plate 68 and the bolts 69 and their springs, nuts and washers. The gland acts as a packing or stufiing box to prevent leakage of air from the hammer cylinder. V V r It willbe noted that the gland 66 can be easily reached for inspection and replacement by a workman underneath theturntable and without having to jack up the truck or raise the turntable thereupon. U

Securely attached to the outer end of the piston rod 63 is a head 12 which has secured therein in any suitable manner the side rods orguides 13 Y which pass through holes in the block 53 and are provided with suitable bearing bushings 74 so that these'rods 1'3 reciprocate with the piston and serve, along with the piston rod '63, to guide the hammer-head 12;

The lower end of the head 12, is boredou't to receive a collar 15, the bore 16 of. which is adapted to receive the shank of impact tools, such, for example, as those shown U. S. Patent 1,891,222 dated December 20, 193 2. p

A transverse pin 11 may extend through the head '12, a portion of the wall of the collar 7 5, and

a portion of the shank of any tool placed in the bore H5 in order to secure the tool to the head.

The cylinder head 6] may be securely bolted down to the upper portion 78 of the trunnion block 53 by means of the rods 19 with the cylinder 60 held securely therebetween.

- The upper and lower ports to admit air above and below the cylinder may be connected by means of pipes 80 and 8| to a control valve-the handle of which is shown at 82. When this valve is moved .in one direction, air is admitted through airv supply pipe 48 via the valve to pipe 81 thereby lifting the piston rod 62 and the tool carried thereby.

If the handle 82 is pushed downward, air will be admitted from the air supply pipe 48 via the valve to pipe 80 thereby depressing the piston and causing the tool operated thereby to strike the surface below the truck.

It will, of course, be understood that both valves referred to herein may have suitable relief ports so that when operating in one direction, the air lines to the opposite side of the valve are open to atmosphere. Such valve constructions are well-known and therefore no attempt is made to describe them in detail.

It will be understood that pipes 80, 8| extending between the valve mechanism and the air cylinder may be the usual flexible hose used for such purposes and are therefore not shown in the drawings. Such hose is shown in the patents before mentioned.

An alternate arrangement for connecting the valve to the hammer is shown in Figure 4 in which all flexible connections between the valve and hammer are eliminated. Here the numerals 80a, 8Ia indicate the pipes connected to couplings 83, 84, which are supported on the axially aligned threaded studs or bosses 85 on the trunnion block 53. The conduits or pipes 80, 8| to the hammer cylinder are now connected into the couplings as shown, therefore these pipes are rigid at all times while the hammer is moved.

As the hammer swings, it will be obvious that the pipes 89a, 81a will turn in the threaded couplings 83, 84, and if sufiiciently long threaded connections are provided, these joints may turn Without appreciable leakage of air, or any suitable form of slip joint 86, 81 can be used at these points or at any point in this piping axially aligned with the axis about which the hammer turns, to permit the piping 80a, 81a connected to the hammer control valve to remain stationary while the hammer assembly moves about its horizontal axis.

What is claimed is:

1. In a device of the character described, a turntable having a journal block thereon, a trunnion block mounted in saidjournal block and adapted to move about a horizontal axis above said table, a fluid operated impact tool carried on said trunnion block and movable therewith, said tool including a cylinder and piston therein, said cylinder having ports located on opposite sides of the piston, conduits extending from said ports and having bores aligned with the axis of said trunnion block a second set of conduits communicating with said bores and thereby being axially aligned with said axis of said trunnion block, and slip connections between said sets of conduits whereby said first conduits may remain fixed in respect to said cylinder ports when said cylinder is moved about said axis.

2. In a. device of the character described, a

carried on said trunnion block and movable therewith, said tool including a cylinder and piston, said cylinder having ports located on opposite sides of said piston, axially aligned bosses on said trunnion block, pipe couplings connected to said bosses, pipes extending between said couplings and said cylinder ports, and pipes axially aligned with said horizontal axis and extending 1 into said couplings whereby fluid connection is maintained through said couplings while said tool moves about said axis.

3. The device claimed in claim 2 in which said pipe couplings comprise or include slip connections arranged to permit relative rotary movement between said pipes connected to said cylinder ports and said last pipes that are aligned with the axis of said trunnion block.

4. In-a device of the character described a turntable, a fluid-operated impact tool mounted upon said turntable to move about a horizontal axis above said turntable, said tool including a cylinder and piston, said cylinder having ports located on opposite sides of said piston, rigid conduits connected to said ports and extending towards the horizontal axis of said tool, a pair of connectors positioned to turn about said axis on opposite sides of said tool and maintain fluid connection with said conduits the while, and pipes secured to said connectors, the latter per-' mitting the movement of said tool and the conduits about said axis.

5. In a device of the character described, a support; a journal block fixed to said support; an impact tool including a cylinder and a piston rod connected to said piston; a trunnion block secured to said cylinder and having laterally ex-' tending bearing portions supported in said journal block whereby said, tool is movably mounted b in said bearings on said support with its horizontal axis passing through the axis of said pis- REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 155,550 Smith Sept. 29, 1874 539,475 Githens May 21, 1895 861,369 Kidder July 30, 1907 1,168,687 Titus Jan. 18, 1916 1,195,344 Feller et al Aug. 22, 1916 1,541,392 Reaney June 9, 1925 1,830,751 Cornett Nov. 10, 1931 1,891,221 Cornett Dec. 20, 1932 2,263,925 Jefirey et al Nov. 25, 1941

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