US3022018A - Renewable tip hammer assembly - Google Patents

Description

Feb. 20, 1962 l.. K. KNIGHT 3,022,018

RENEWABLE TIP HAMMER ASSEMBLY Filed July 19, 1960 LLOYD K'. KNIGHT, BY

W ww l2 HTTY United The instant invention relates to a renewable tip hammer for use in a pulverizer, in which the hammer may be removed from the shank by which the hammer is mounted in the pulverizer to permit reversal of the hammer or replacement thereof.

lt is an object of the instant invention to provide an improved renewable tip hammer assembly in which the hammer may readily be removed from the hammer assembly.

It is another object of the instant invention to provide an improved renewable tip hammer assembly in which the hammer may be readily replaced after it has been worn down, or may be reversed after one hammer face has been worn down.

It is a further object of the instant invention to provide an improved renewable tip hammer assembly in which the elements thereof are maintained in assembly by a locking pin that may be readily removed for disassembly of the elements.

It is still another object of the instant invention to provide an improved renewable tip hammer assembly in which the several elements thereof are maintained in assembly by a spring locking pin that may be readily removed for disassembly of the elements.

A still further object of the instant invention is to provide an improved renewable tip hammer assembly in which the elements thereof are secured in assembly by a locking pin, which is enclosed within the hammer to protect the locking pin from damage during the operation of the hammer assembly.

It is also an object of the instant invention to provide an improved hammer assembly in which the several elements thereof are loosely assembled and are secured in assembly by a locking pin rmly secured to one of the elements of the hammer assembly.

Other objects of the invention will appear hereinafter, the novel features and combinations being set forth in the appended claims.

In the accompanying drawings:

FIG. 1 is a side elevational view of a hammer assembly constructed in accordance with the instant invention;

FIG. 2 is a rear elevational view, partially in section, of the hammer assembly;

FIG. 3 is a sectional view of the hammer assembly taken on the line 3 3 in FIG. 2;

FIG. 4 is a sectional view of the hammer assembly taken on the line 4--4 in FIG. 2;

FlG. 5 is a side elevational View, partially in section, of a modified form of the hammer assembly constructed in accordance with the instant invention; and

FIG. 6 is a front elevational view, partially in section, 0f the hammer assembly illustrated in FIG. 5.

Referring to FIGS. l to 4 of the drawings, there is illustrated one embodiment of a hammer assembly 10, constructed in accordance with the instant invention. The hammer assembly is adapted to be utilized in a pulverizer having a rotor of a known form comprising several axially spaced rotor discs mounted on a shaft by which the rotor is rotated. A plurality of circumferentially spaced hammer rods extend in an axial direction through the rotor discs at positions adjacent the periphery of the rotor discs, and the hammer assembly 10 is mounted on a hammer assembly mounting rod 11, as illustrated in the drawings herein.

arent 3,022,9l8 Patented Feb. 20, 1962 The hammer assembly 10 has a pair of similar shanks 12, which are spaced from each other in an axial direction. Each shank 12 is formed with a bore 13 at one end thereof, which is of somewhat larger diameter than the hammer assembly mounting rod 11, so that the Shanks 12 lit loosely on the rod 11. Upon rotation of the rotor including the hammer assembly mounting rod 11, the hammer assembly 10 will take a radial position with respect to the rotor by operation of centrifugal force. When the rotor is stationary the hammer assembly 10 will be suspended loosely on the hammer assembly mounting rod 11.

A hammer 15 is adapted to be mounted on the lower ends of the shanks 12. Each shank 12 is formed with a tongue 16 which is inset from the opposite faces 17, 18 of the shank 12. The hammer 15 includes a pair of recesses 19, which are spaced from each other, and are complementally formed with respect to the tongues 16 of the Shanks 12. The recesses 19 are somewhat larger than the tongues 16 for a loose tit of the hammer 15 on the Shanks 12. The recesses 19 are spaced from each other, as seen in FIG. 2, and the walls 20, 21 are provided at the opposite sides of each recess 19.

The tongue 16 of each shank 12 is provided with a bore 22, and each wall 20, 21, at the opposite sides of the recesses 19, is similarly formed with a bore 23. The several bores 22, 23 in the shanks 12 and in the hammer 15, respectively, are of the same diameter and are adapted to be aligned with each other when the tongues 16 are received within the recesses 19. A hammer supporting pin 24 extends through the bores 22, 23 and serves to connect the hammer 15 to the shanks 12, and thereby supports the hammer 15 on the Shanks 12. Each of the bores 22, 23 has a somewhat larger diameter than the hammer supporting pin 24 for a loose fit of the hammer supporting pin 24 in the several bores 22, 23.

The hammer 15 is formed with a cavity 25 disposed between the inner walls 26, as best seen in FIGS. 2 and 4. The hammer supporting pin 24 extends through the cavity 25, and is formed with a transversely extending Ibore 26, which intersects the axis of the hammer supporting pin 24. The hammer 15 includes bores 27, 28, which are aligned with each other and with the bore 26 in the hammer supporting pin 24. The bores 27, 23 are of somewhat larger diameter than the bore 26. A cylindrical spring locking pin 29 is inserted into the bore 26 of the hammer supporting pin 24. The bore 26 is of such diameter that the locking pin 24 must be press fitted into the bore 26 for securelyl holding the locking pin 29 in the bore 26. The bores 27, 2% in the hammer 15 provide access to the bore 26 for insertion of the locking pin 29 therein, and also permit removal of the locking pin 29. The spring locking pin 29 is of such length that it extends into the bores 27, 28 of the hammer 15, and thereby prevents the hammer supporting pin 24 from working out of the ha-mmer assembly 1l) in an axial direction. It will be understood that since the bores 27, 2S are of somewhat larger diameter than the locking pin 26 there may be some axial movement of the hammer supporting pin 24, the maximum amount of such movement being equal to the dierence in diameter of the locking pin 29 and the bores 27, 2S. However, such axial movement o-f the hammer supporting pin 24 is so Small that there is no possibility of aecting the assembly of the hammer 15 on the Shanks 12 as described herein.

The cylindrical spring locking pin 29, which is illustrated in the drawings, is of a type that is formed as a tube which is split along one side thereof. In applying the locking pin to a bore, such as the bore 26, the locking pin 29 is compressed and is thereby secured in the bore to which it is applied. It will be understood that the cyiindrical spring locking pin 29, which is illustrated in the drawings, is only one exemplary form of this device, and other locking pins may be utilized in 30, 31 of the hammer 15 extend upwardly around the tongues 16 of theV Shanks 12, and there is provided a substantial thickness of hammer material around the tongues 16 to protect the latter during operation of the i hammer assembly 1Q. As seen in FIG. 4, the opposite ends of the locking pin 29 are disposed a substantial distance inwardly from the front and rear faces 30, 31 of the hammer 15 to protect the locking pin 29 and to preventk damage thereto during operation of the hammer assembly 10. Thus, it isV always possible to readily remove the locking pin 29. The several elements of the hammer assembly are loosely assembled with respect to each other to prevent the elements from freezing together as a result of the impact forces brought to bear on the hammer assembly 10 during operation of the latter. lThis facilitates disassembly of the elements of the -hammer assembly 10. The Shanks 12 and the hammer15 are symmetrically formed so thatrwhen the front lface 3G of the hammer 15 is worn, the hammer 15 may be removed from the Shanks 12 and replaced on the Shanks 12 in reverse position, whereby the rear face 31 will then be the operating face of the hammer 15.

In` FIGS. 5 and 6 there is illustrated a hammer assem- Y bly 35 which is anotherembodiment of the instant invention, and is a modified form of the structure illus- Vtrated in FIGS. 1 to 4. The hammer assembly 35 is adapted toV be mounted on a hammer assembly mounting rod 36 which is included in a'pulverizer rotor `by which the hammer assembly 35 is revolved.

The hammer assembly 35 includes a single shank 37 formed with a bore 38 at one end thereof by which the hammer assembly 35 is mounted on the rod 36. The bore 38 is of somewhat larger diameterA than the rod 36 forrloosely mounting the hammer assembly 35 on the rod 36. In operation of the hammer assembly 35 it will take a radial position with respect to the pulverizer rotor by the action of centrifugal force. Y

The shank 37 includes a tongue 39 which is insetfrom the opposite faces 40, 41 of the shank 37. The hammer 42 is for-med with a centrally disposed recess 43, which is adapted to receive the tongue 39.V The recess 43 is complementally formed with respect to the tongue 39, and is somewhat larger than the `tongue 39 for a loose it of the tongue 39 in the recess 43. The hammer 42 includes walls 44, 45 disposed at opposite sides of the recess 43, and serving to protect the tongue 39 during operation of the hammer assembly 35. Y

A -bore 46 is formed in the tongue 39, and bores 47 are formed in the walls 44, 45. The several bores 46, 47 are axially aligned with each other and are of the same diameter. A hammer supporting pin 4S extends through the bores 46, -47 for joining the hammer 42'to the shank 37 and supporting the hammer 42 on the shank 37. The bores 46, `47 are of somewhat larger diameter than the pin 48 for a loose t of the latter in the bores 46, 47.

The hammer supporting pin 48 has a transversely ex-Y tending bore 49 which intersects the axis of the pin 48. The tongue 39 of the shank 37 is formed with bores 50,51 at the opposite sides of the hammer supporting pin 48 and disposed in alignment with the bore 49. The 7 hammer 42 is formed with bores 52, 53 which are alsothe bore 49 of the hammer supporting pin 48, and is of such size that it is press iitted into the bore 49 to Vbe securely held therein. j

The cylindrical spring locking pin 54 holds the several elements of the hammer assembly 35 together by preventing axial movement of the hammer supporting pin 48. As seen in FIG. 5, thelocking pin 54 is of such length, that at the opposite sides of the hammer supporting pin 4S, the lo-cking pin 54 extends into the bores 5G, 51, 52, 53. Since the bores Sil, 51,52, 53 are of somewhat larger dia-meterethan the locking pin 54, there may be a limited amount of axial movement of the hammer supporting pin 48, but this will be sosmall as to prevent the elements of the-hammer assemblyr35 from separating.

The several elements of the hammer assembly 35 are loosely assembled with Aeach other to facilitate disassembly thereof for removal of the hammer 42. The locking pin 54 is compressed when it is secured in the bore 49 of the hammer supporting pin 48, and is securely Vheld in the hammer supporting pin 48. However, the locking pin 54 is loose with respect to the shank 37 and the hammer 42, and may be readily removed from the hammer supporting pin 48 throughrthe bores 50, 51, 52, 53 which provide access to the'locking pin 54.

As viewed in FIG. 5, the hammer assembly 35 is ref volved in a clockwise direction, asY indicated by the arrow.

The hammer 42 has a front face 55 and a rear face 56. Y

VIn the operation of the hammer assembly 35, as described, the front face 55 Vof the hammer 42' will be the operating ,face of the latter, and the rear face 56 will be the inactive face thereof. The hammer 42 andthe shank 37 are each symmetrical, so that when the front face 55 has become Worn the hammer 42 may be readily removed from the shank 37 and re-assembled in reverse position Vto make the rear face 56'the operating face of the hammer42. When both faces 55, 56 of the hammer 42 have become worn, the hammer 42 may be replaced by another hammer. The hammer faces 55, 56 extend upwardly around the tongue 39 of the shank 37 and provide a substantial thickness of hammer material around the tongue 39xfor protection of the latter during operation of the hammer assembly 35. Since the locking pin 54 is inset from the hammer faces 55, 56, it also is protected during operation of the hammer.V

By the instant invention there is provided an improved renewable tip hammer assembly in which the hammer may be readily removed from the shank on which therhammer is mounted. The several elements of the hammer assembly are held together by a locking pin that may be readily removed from the assembly, when Vthe hammer hassbecome worn and it is. desired to remove the latter from the hammer assembly. The locking pin is protected by the hammer during the operation of the hammer assembly so that it cannot be damaged, thereby facilitating the removal of the locking pin when it is desired Yto disassemble the hammer assembly. Y Y f ObviouslyV those skilled in the art may'make various vchanges in the details and arrangement of parts without departing from the spirit and scope of the invention as defined by the claims hereto appended, and applicant thereforewishes not to Ybe restricted to the precise construction herein disclosed.

' Vthe pulverizer, a hammer adapted to be secured to the Shanks, each of said Shanks including a hammer mounting tongue, said hammer including a pair of lspaced recesses each adapted to receive one of said tongues, a hammer supporting pin extending through'the hammer and said tongues and loosely received in the hammer and tongues for holding Vthe hammer on the Shanks, a transverse bore in said hammer supporting pin, a locking pin secured in said transverse bore to maintain the hammer supporting pin in assembly with the shanks and hammer, said transverse bore and locking pin being disposed intermediate the hammer recesses, and a bore in the hammer aligned with said transverse bore to provide access to said transverse bore for insertion of the locking pin into said transverse bore, said hammer bore being substantially larger than the locking pin.

2. A renewable tip hammer assembly for a pulverizer comprising a shank for mounting a hammer in the pulverizer, a hammer adapted to be secured to the shank, said shank including a hammer mounting tongue, said hammer including a recess to receive said tongue, a hammer supporting pin extending through the hammer and tongue and loosely received in the hammer and tongue for holding the hammer on the shank, a transverse bore in said hammer supporting pin formed on an axis intersecting the tongue, a locking pin secured in said transverse bore to maintain the hammer supporting pin in assembly with the shank and hammer, and aligned bores in the hammer and tongue formed on the axis of said transverse bore and aligned therewith to provide access to said transverse bore for insertion of the locking pin into said transverse bore, said aligned bores in the hammer and tongue being substantially larger than the locking pin.

3. A renewable tip hammer assembly for a pulverizer comprising a shank for mounting a hammer in the pulverizer, a hammer adapted to be secured to the shank, said shank including a hammer mounting tongue, said hammer including a recess to receive said tongue, said hammer recess and said tongue being of such relative size that the tongue ts loosely within the hammer recess, a hammer supporting pin extending through the hammer and tongue and loosely received in the hammer and tongue for holding the hammer on the shank, a transverse bore in said hammer supporting pin, a locking pin secured in said transverse bore to maintain the hammer supporting pin in assembly with the shank and hammer, a bore in the hammer aligned with said transverse bore to provide access to said transverse bore for insertion of the locking pin into said transverse bore, and said hammer bore being substantially larger in diameter than the locking pin.

4. A renewable tip hammer assembly for a pulverizer comprising a shank for mounting a hammer in the pulverizer, a hammer adapted to be secured to the shank, said hammer including a recess to receive said shank, a hammer supporting pin extending through the hammer and shank for holding the hammer on the shank, a transverse bore in said hammer supporting pin, a spring locking pin press fitted in said transverse bore and secured therein to maintain the hammer supporting pin in assembly with the shank and hammer, and a bore in the hammer aligned with said transverse bore to provide access to said transverse bore for press littng the locking pin, said hammer bore being substantially larger than vthe locking pin into said transverse bore.

References Cited in the tile of this patent UNITED STATES PATENTS 1,166,698 Lincoln Jan. 4, 1916 1,693,058 Shelton Nov. 27, 1928 Y 1,940,116 Brooks Dec. 19, 1933 FOREGN PATENTS 683,171 Germany Oct. 31, 1939 891,047 Germany Sept. 24, 1953

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