CA1127130A - Caps for hammermill rotors secured by non-protruding individually removable pin assemblies - Google Patents
Caps for hammermill rotors secured by non-protruding individually removable pin assembliesInfo
- Publication number
- CA1127130A CA1127130A CA326,296A CA326296A CA1127130A CA 1127130 A CA1127130 A CA 1127130A CA 326296 A CA326296 A CA 326296A CA 1127130 A CA1127130 A CA 1127130A
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- Canada
- Prior art keywords
- arms
- pins
- rotor
- hammers
- caps
- Prior art date
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Abstract
IN THE CANADIAN PATENT OFFICE
Application for Patent and Offer of Disclosure for Public Dissemination Inventor: Robert M. Stepanek Owner: Pettibone Corppration Title: CAPS FOR HAMMERMILL ROTORS SECURED BY NON-PROTRUDING
INDIVIDUALLY-REMOVABIE PIN ASSEMBLIES
ABSTRACT OF DISCLOSURE
Leading edges of rotor plates which carry the swing hammers of hammermills are protected from wear by removable caps, each secured by paired-pin assemblies. Each pin assembly includes a pair of tubular pins which may be axially abutting one another.
During rotor operation, each pin assembly is reliably secure in a pinning position without protrusion into the space between the caps in which the hammers swing. For removal of a cap, the paired pins may be separated, and each part maneuvered to permit the cap to be slipped off, without removal of the rotor or its rotor plates.
In the illustrated form, the two pins are secured together by a tie bolt through them and countersunk into the pins; and the pins have heads on one end countersunk into the side wall of the cap.
Application for Patent and Offer of Disclosure for Public Dissemination Inventor: Robert M. Stepanek Owner: Pettibone Corppration Title: CAPS FOR HAMMERMILL ROTORS SECURED BY NON-PROTRUDING
INDIVIDUALLY-REMOVABIE PIN ASSEMBLIES
ABSTRACT OF DISCLOSURE
Leading edges of rotor plates which carry the swing hammers of hammermills are protected from wear by removable caps, each secured by paired-pin assemblies. Each pin assembly includes a pair of tubular pins which may be axially abutting one another.
During rotor operation, each pin assembly is reliably secure in a pinning position without protrusion into the space between the caps in which the hammers swing. For removal of a cap, the paired pins may be separated, and each part maneuvered to permit the cap to be slipped off, without removal of the rotor or its rotor plates.
In the illustrated form, the two pins are secured together by a tie bolt through them and countersunk into the pins; and the pins have heads on one end countersunk into the side wall of the cap.
Description
L~/~t "~`
.`~ m30 _ ;-. , ;~, .
INTRODUCTIO~
The invention of which the present disclosure is ' of~ered for public disseminatio~ in the event adequate patent protection is available relates to hammermills of the swing- -hammer type. One use for hammermills, for which the presen~ in-venti~n is espPcially suitable, is for shredding auto~obile bodie~
,and the like. In such hammermills, the hammers are part of a rotor which is driven at high speed by its shaft. Each shaft carries a series of haimmer-holding discs or plates ~which could also be called spiders). ,~ ham~erbolt extends parallel to the shaft throuyh a row of spaced spider arms provided by said plates, with a swing hammer carried by the hammerbolt in the space between each adjacent pair o:E arms in the row. As the hanur~ers smash the material . ed to the hammermill, fragments or shreds fly about or -remain, and the ro~ating arms inevitably strike some of these ' pieces and are abraded by them so that eventually, if not pro-tected, they become so woxn that they must be replaced.
Replacing the plates, discs~ or spiders which form ~'- these arms is very expensive, both as to parts cost and as to '~
`~ ~20 ~abor. For a ~umber of years it has been recognized that a great;~, .. .
- sa~ing can 'bc accomplished by replaceable caps o~er the leading ,~
edges o~ th~ase ~okating arms ~o that neaxly all of ~e wea~ wh~h '-, would oth~xwise be on the arms themselves is on these caps. -~-~,'o', When worn ~o the extent that they may soon ail to protect the ~
~` arms, they may be replaced. ' ~i ,~ , An example of such caps is Francis Patent 3,727,848~ .5, ~, . ;, `~'';' in which the 5pider arms are specia~ly shaped with deep central '"~
grooves in them to receive inwardly extending cen~ral flanges on~
the caps, with the hammer~olts passing through these flanges to ~, ' ~'- 30 hold the`caps in pl~ce. Although widely used~ this has had some,~ ~, recognized disadvantages including the fact that the cap8 could not be repla~ed without drawing a hammerbolt so that the ha~msr ~wern'also relea~ed. 2 ~ ~nother example was Hightower Patent 3,8~.~,494~U.S.). In~~
this construction, also, caps could only be replaced by with-drawing the hammer bolt which would release all o the hammers.
Prior to these patented constructions, the owner of the present application had protected the rotor arms with caps which were secured in place partly by wel~ing. However, these oaps were also secured in plaçe ~artly by the hammerbolts, and hence could not be removed without withdxawing the hammerbolt and thereby releasing all o its hamm~rs.
The owner of this application has moxe rec~ntly pro-tected the rotor axms by caps which could be remo~ed without removing the ham~lerbolts. However, these caps were secured by long bol~ similar to the hammerbolt5 which had to be withdrawn in similar manner. Each cap-securing bar extended axially the -full length of the rotor. A recogniæed disadvantage of thiB
construction was that the swinging of the hammers was limited. i-hammer could not swing through a full circle, because it would strike the bolt which extended through the arms the full ;-~
length of the rotor to secure the caps.
According to the present invention these vario~s ais-advantages are avoided. Each cap can be removed separa~ely, and the hammer~ are not impeded ~y the cap-securing maans rom ~ull- `"
circle swinging. Various discouraging con~iderations were over-come by providing countersunk pin assem~lies which, in spite of ~
limited clearances, could be removed. ~ach pin assembly includes `
two aligned sturdy flat-headed tubular pins extending through the intexaces between the caps and the arms to absorb such impacts as may result from their relative movement, these two sturdy outer pins being held substantially by an inner bolt fully countersunk in the outer pins, which in ~urn are ~ully countersunk within the faces of the sides of the caps.
~ . ' - 112713~) Therefore, and in accordance with the present invention there is provided in a.hammermill rotor including as environment for this improvement a row of spaced rotor arms, mounted on and rotatable by a drive shaft, swing hammers in the spaces between the arms within the row, a hammerbolt extending axially through the arms and hammers to swingably secure the hammers, the improvement comprising caps positioned over the leading edges of the arms and having side portions extending inwardly along the side faces of the arms, the caps being secured by pin assemblies in the arms and side portions but not protruding beyond the side portions, thereby leaving the spaces between the side portions free for the swinging of the hammers, the pin assemblies including two aligned pins in one assembly separable at a cleavage plane located in the central zone of the cap~ed arm while the pin assembly is in pinning position, and each of the aligned pins being movable from the pinning position to permit removal of the cap, and each pin assembly being reliably secure in its pinning position during operation of the rotor.
The advantages of the invention will be more easily understood in the li.ght of the description and the drawings.
.
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, DESIG~IATION OF FIGURES
Fi~. 1 is a sectional view throu~h a rotor of this in~en-tion, ta~en approximately along the irre~ular line 1-1 of Fig. 20 Fig. 2 is a radial sectional view through the rotor of Fig~
1, taken approximately along the line 2-2 of Fig. 1.
Fig. 3 is a fragmentary sectional view taken approximately along the line 3-3 of ~ig. 2t being irre~ular, but approximately 90 displaced from the upper portion o`~ Fig. 1.
Fig. 4 is a sid~ view o~ one of the longer pins, showing it aligned with Fi~. 3 a~ i~ just remo~ed tXererrom.
.~3A~KGRO~G ~ESCRIPTIQN
Rotors such as that of this invention conventionally in-clude a drive shaft 11, which may run in bearing assemblies 12, carried by a housing or support not sho~.
The working part of the rotor includes two end discs 13 between which are compactly arran~ed hammer carryi~g rotor plates, sometimes called "spiders", such as the generally rectan~ular rotor pla~es 14 shown in horizontal disposition in Fig. 2.. In Fig.
.`~ m30 _ ;-. , ;~, .
INTRODUCTIO~
The invention of which the present disclosure is ' of~ered for public disseminatio~ in the event adequate patent protection is available relates to hammermills of the swing- -hammer type. One use for hammermills, for which the presen~ in-venti~n is espPcially suitable, is for shredding auto~obile bodie~
,and the like. In such hammermills, the hammers are part of a rotor which is driven at high speed by its shaft. Each shaft carries a series of haimmer-holding discs or plates ~which could also be called spiders). ,~ ham~erbolt extends parallel to the shaft throuyh a row of spaced spider arms provided by said plates, with a swing hammer carried by the hammerbolt in the space between each adjacent pair o:E arms in the row. As the hanur~ers smash the material . ed to the hammermill, fragments or shreds fly about or -remain, and the ro~ating arms inevitably strike some of these ' pieces and are abraded by them so that eventually, if not pro-tected, they become so woxn that they must be replaced.
Replacing the plates, discs~ or spiders which form ~'- these arms is very expensive, both as to parts cost and as to '~
`~ ~20 ~abor. For a ~umber of years it has been recognized that a great;~, .. .
- sa~ing can 'bc accomplished by replaceable caps o~er the leading ,~
edges o~ th~ase ~okating arms ~o that neaxly all of ~e wea~ wh~h '-, would oth~xwise be on the arms themselves is on these caps. -~-~,'o', When worn ~o the extent that they may soon ail to protect the ~
~` arms, they may be replaced. ' ~i ,~ , An example of such caps is Francis Patent 3,727,848~ .5, ~, . ;, `~'';' in which the 5pider arms are specia~ly shaped with deep central '"~
grooves in them to receive inwardly extending cen~ral flanges on~
the caps, with the hammer~olts passing through these flanges to ~, ' ~'- 30 hold the`caps in pl~ce. Although widely used~ this has had some,~ ~, recognized disadvantages including the fact that the cap8 could not be repla~ed without drawing a hammerbolt so that the ha~msr ~wern'also relea~ed. 2 ~ ~nother example was Hightower Patent 3,8~.~,494~U.S.). In~~
this construction, also, caps could only be replaced by with-drawing the hammer bolt which would release all o the hammers.
Prior to these patented constructions, the owner of the present application had protected the rotor arms with caps which were secured in place partly by wel~ing. However, these oaps were also secured in plaçe ~artly by the hammerbolts, and hence could not be removed without withdxawing the hammerbolt and thereby releasing all o its hamm~rs.
The owner of this application has moxe rec~ntly pro-tected the rotor axms by caps which could be remo~ed without removing the ham~lerbolts. However, these caps were secured by long bol~ similar to the hammerbolt5 which had to be withdrawn in similar manner. Each cap-securing bar extended axially the -full length of the rotor. A recogniæed disadvantage of thiB
construction was that the swinging of the hammers was limited. i-hammer could not swing through a full circle, because it would strike the bolt which extended through the arms the full ;-~
length of the rotor to secure the caps.
According to the present invention these vario~s ais-advantages are avoided. Each cap can be removed separa~ely, and the hammer~ are not impeded ~y the cap-securing maans rom ~ull- `"
circle swinging. Various discouraging con~iderations were over-come by providing countersunk pin assem~lies which, in spite of ~
limited clearances, could be removed. ~ach pin assembly includes `
two aligned sturdy flat-headed tubular pins extending through the intexaces between the caps and the arms to absorb such impacts as may result from their relative movement, these two sturdy outer pins being held substantially by an inner bolt fully countersunk in the outer pins, which in ~urn are ~ully countersunk within the faces of the sides of the caps.
~ . ' - 112713~) Therefore, and in accordance with the present invention there is provided in a.hammermill rotor including as environment for this improvement a row of spaced rotor arms, mounted on and rotatable by a drive shaft, swing hammers in the spaces between the arms within the row, a hammerbolt extending axially through the arms and hammers to swingably secure the hammers, the improvement comprising caps positioned over the leading edges of the arms and having side portions extending inwardly along the side faces of the arms, the caps being secured by pin assemblies in the arms and side portions but not protruding beyond the side portions, thereby leaving the spaces between the side portions free for the swinging of the hammers, the pin assemblies including two aligned pins in one assembly separable at a cleavage plane located in the central zone of the cap~ed arm while the pin assembly is in pinning position, and each of the aligned pins being movable from the pinning position to permit removal of the cap, and each pin assembly being reliably secure in its pinning position during operation of the rotor.
The advantages of the invention will be more easily understood in the li.ght of the description and the drawings.
.
,,~.~"
- 3a -csm/~
~R/vt-ps .
, DESIG~IATION OF FIGURES
Fi~. 1 is a sectional view throu~h a rotor of this in~en-tion, ta~en approximately along the irre~ular line 1-1 of Fig. 20 Fig. 2 is a radial sectional view through the rotor of Fig~
1, taken approximately along the line 2-2 of Fig. 1.
Fig. 3 is a fragmentary sectional view taken approximately along the line 3-3 of ~ig. 2t being irre~ular, but approximately 90 displaced from the upper portion o`~ Fig. 1.
Fig. 4 is a sid~ view o~ one of the longer pins, showing it aligned with Fi~. 3 a~ i~ just remo~ed tXererrom.
.~3A~KGRO~G ~ESCRIPTIQN
Rotors such as that of this invention conventionally in-clude a drive shaft 11, which may run in bearing assemblies 12, carried by a housing or support not sho~.
The working part of the rotor includes two end discs 13 between which are compactly arran~ed hammer carryi~g rotor plates, sometimes called "spiders", such as the generally rectan~ular rotor pla~es 14 shown in horizontal disposition in Fig. 2.. In Fig.
2 the rotor plates 1~ are arran~ed in crossing directions, The rotor plates 14 that appear horizontally in Fig. 2 are s~nin sectior.
in Fig. 3, while the rotor plates 1~ that appear vertically in :
Flg. 2 are seen in section in Fi~
As seen best in Fig. 1~ the crossed dispositions of the ~-rotor plates 14 leave harnmer-receiving spaces between the pro- -~ectine end portions o~ the rotor plates 14. Along e~oh row o~ ;:
pro3ecting end portions, a row of swing hammers 16 is located. -~That some of these hammers are different~r.om others has no pertin-ence to the preSent in~ention. The ha~mers lG of each row are .~:~
carried by a hammerbolt 17. It is conventinnal to be ~ble to withdraw the hammerbolt 17 by axial movemenb in either direction,;`-.
so that t~e ha~ners 16 can be replaced when they have become badly worn. ` -.
DESCRIPTIO~l OF THE PREFERRED FORM OF :~
THE P~ESENT IMVENTION ~-~
The present invention is particularly concerned with - ~
caps 18, which,.as best seen at the left side in Fig. 2, protect ~e . ~ . ,.
~- ~
PCO-178.01 11~130 leading edges of the rotor plate 14. Caps for this purpose have been provided heretofore. The caps 18 have side portions 19. According to the present invention the caps 18 are secured on the rotor plates 14 by pin assemblies having some special characteristics.
Pin ass~lies may each include two pins, such as pins 21, reliably held in place with each pin in pinning position extending across the interface between a side portion 19 and the rotor plate which carries it, and with no part of the pin assembly protruding from the side portion into the space between the caps where the hammers swing. The illustrated securing means is a bolt 22 passing through the pins 21, which are tubular, and its nut 23. The bolts ~2 may look too long to be removed, but they can be "snaked" in and out, partly because the pins 21 are countersunk to receive the heads o~ bolts 22.
The pin assemblies for the rightmost and leftmost caps 18 in Fig. 3 are varied to the extent that in addition to one pin 21, there is a longer pin 27 for extending through the end disc 13 to be accessible from the outside of the housing. Also, a longer bolt 2~ is used. Because it is inserted from the outside, it does not 2~ need to be as short as bolts 22 in order to be removed.
Each of pins 21 and 27 has a head 24 which is best seen in Fig~ 4 where it is shown on pin 2~. This head may be described as a conical-flat head. In other words, its face toward the body of its pin (27 in Fig. 4) is of conical shape, while its end ~ace lies in a flat plane. The small end of pin 21 and 27 has a taper 26 to ease its insertion.
Although often the caps will all be replaced at onde, a single one could be replaced if it should be more worn than others.
The end caps, at the right and left in Fig. 3, can be removed easily by axially removing the bolts 28 after removing their nuts 23. As to the intermediate caps 18, the removal i5 almost as easy because their bolts 22 can be withdrawn axially until they can be "snaked" out by tilting. The short pins 21 are short enough, as shown, so that when L~/v~ ~
13~
' xemoved axially, they can, without being tilted, be moved radial-iy ~etween the sides of the caps. When both pins have been re-moved, the cap 18 may be slipped off, a new cap substituted, the pins 21 worked back into the position shown in Fig. 3, and be secured there by a bol~ 22 and its nut 23. O~ course, any damaged pin or bolt would be replaced by a corx~sponding part.
It is preferxed that t~e ~in~ 21 be.long eno~gh QO that they will abut togeth~r while still having some appreciab}e end-play, as this will ~acilitate their removal. The endplay may per-mit a tool to be inserted.under one head 24 for prying the pin out.Optional~y, or when necessary, a hammer blow on the head of one pin will usually knock the other pin loose or even completely out.
The heads are enough thinner than the recesses for receiving the `
head3 ~ 80 that with maximum endplay ~he head will not protrude beyond the outer radial face of the cap. The coun~ersinking re-~cesses in the ends of the pins are oversize around the bolt head or nut to rcceiYe a socket wrench ox ring wrench for screwing the nut on the bolt. One end could be held by the parts, the wrench-receiving space being provided only at the other end.
: 20 ~ARI~TIO~S
Thexe may be numerous variations which would meet the pri-`~
mary re~uirement o~ a ully-couhtersunk pin assemb~y made u~ o~
two parts each short en~ugh to be removed through the space be-tween the caps even though it is less than the thickness o the caps which the pin assembly must substantially subtend. One varia-tion would be to have one of the pins threaded to the other so that in efect they ~orm their own retaining bolt. The illustrated form is pre~erred, however7 because experience has shown that there is almost never any dificulty in unscxewing the illustrated nut and removing the illustrated bolt. . -~;
A~IIEVEMENT
From the ~oregoing it is seen that the xotor arm9 or ~pi~er arms are protected ~y caps which are readily remova~le whenever - u ~
LR/vt ~27130 desired, w~thout having to d~aw the hammerbol~ or~ any si~ilar bolt which would pro~en~ ~he full circie ~winging o~ ~he j :.
hammers that some purchasers of hammermill~ or metal-shredder~
pr-f r.
.- ' .
, ' : , ,- '`
., .. , -. i . ' ' ' , . , . ,~ ,, ~ r ,. i :~
. ' `.' ~
, _7_ ~ ~
in Fig. 3, while the rotor plates 1~ that appear vertically in :
Flg. 2 are seen in section in Fi~
As seen best in Fig. 1~ the crossed dispositions of the ~-rotor plates 14 leave harnmer-receiving spaces between the pro- -~ectine end portions o~ the rotor plates 14. Along e~oh row o~ ;:
pro3ecting end portions, a row of swing hammers 16 is located. -~That some of these hammers are different~r.om others has no pertin-ence to the preSent in~ention. The ha~mers lG of each row are .~:~
carried by a hammerbolt 17. It is conventinnal to be ~ble to withdraw the hammerbolt 17 by axial movemenb in either direction,;`-.
so that t~e ha~ners 16 can be replaced when they have become badly worn. ` -.
DESCRIPTIO~l OF THE PREFERRED FORM OF :~
THE P~ESENT IMVENTION ~-~
The present invention is particularly concerned with - ~
caps 18, which,.as best seen at the left side in Fig. 2, protect ~e . ~ . ,.
~- ~
PCO-178.01 11~130 leading edges of the rotor plate 14. Caps for this purpose have been provided heretofore. The caps 18 have side portions 19. According to the present invention the caps 18 are secured on the rotor plates 14 by pin assemblies having some special characteristics.
Pin ass~lies may each include two pins, such as pins 21, reliably held in place with each pin in pinning position extending across the interface between a side portion 19 and the rotor plate which carries it, and with no part of the pin assembly protruding from the side portion into the space between the caps where the hammers swing. The illustrated securing means is a bolt 22 passing through the pins 21, which are tubular, and its nut 23. The bolts ~2 may look too long to be removed, but they can be "snaked" in and out, partly because the pins 21 are countersunk to receive the heads o~ bolts 22.
The pin assemblies for the rightmost and leftmost caps 18 in Fig. 3 are varied to the extent that in addition to one pin 21, there is a longer pin 27 for extending through the end disc 13 to be accessible from the outside of the housing. Also, a longer bolt 2~ is used. Because it is inserted from the outside, it does not 2~ need to be as short as bolts 22 in order to be removed.
Each of pins 21 and 27 has a head 24 which is best seen in Fig~ 4 where it is shown on pin 2~. This head may be described as a conical-flat head. In other words, its face toward the body of its pin (27 in Fig. 4) is of conical shape, while its end ~ace lies in a flat plane. The small end of pin 21 and 27 has a taper 26 to ease its insertion.
Although often the caps will all be replaced at onde, a single one could be replaced if it should be more worn than others.
The end caps, at the right and left in Fig. 3, can be removed easily by axially removing the bolts 28 after removing their nuts 23. As to the intermediate caps 18, the removal i5 almost as easy because their bolts 22 can be withdrawn axially until they can be "snaked" out by tilting. The short pins 21 are short enough, as shown, so that when L~/v~ ~
13~
' xemoved axially, they can, without being tilted, be moved radial-iy ~etween the sides of the caps. When both pins have been re-moved, the cap 18 may be slipped off, a new cap substituted, the pins 21 worked back into the position shown in Fig. 3, and be secured there by a bol~ 22 and its nut 23. O~ course, any damaged pin or bolt would be replaced by a corx~sponding part.
It is preferxed that t~e ~in~ 21 be.long eno~gh QO that they will abut togeth~r while still having some appreciab}e end-play, as this will ~acilitate their removal. The endplay may per-mit a tool to be inserted.under one head 24 for prying the pin out.Optional~y, or when necessary, a hammer blow on the head of one pin will usually knock the other pin loose or even completely out.
The heads are enough thinner than the recesses for receiving the `
head3 ~ 80 that with maximum endplay ~he head will not protrude beyond the outer radial face of the cap. The coun~ersinking re-~cesses in the ends of the pins are oversize around the bolt head or nut to rcceiYe a socket wrench ox ring wrench for screwing the nut on the bolt. One end could be held by the parts, the wrench-receiving space being provided only at the other end.
: 20 ~ARI~TIO~S
Thexe may be numerous variations which would meet the pri-`~
mary re~uirement o~ a ully-couhtersunk pin assemb~y made u~ o~
two parts each short en~ugh to be removed through the space be-tween the caps even though it is less than the thickness o the caps which the pin assembly must substantially subtend. One varia-tion would be to have one of the pins threaded to the other so that in efect they ~orm their own retaining bolt. The illustrated form is pre~erred, however7 because experience has shown that there is almost never any dificulty in unscxewing the illustrated nut and removing the illustrated bolt. . -~;
A~IIEVEMENT
From the ~oregoing it is seen that the xotor arm9 or ~pi~er arms are protected ~y caps which are readily remova~le whenever - u ~
LR/vt ~27130 desired, w~thout having to d~aw the hammerbol~ or~ any si~ilar bolt which would pro~en~ ~he full circie ~winging o~ ~he j :.
hammers that some purchasers of hammermill~ or metal-shredder~
pr-f r.
.- ' .
, ' : , ,- '`
., .. , -. i . ' ' ' , . , . ,~ ,, ~ r ,. i :~
. ' `.' ~
, _7_ ~ ~
Claims (5)
1. In a hammermill rotor including as environment for this improvement a row of spaced rotor arms, mounted on and rotatable by a drive shaft, swing hammers in the spaces between the arms within the row, a hammerbolt extending axially through the arms and hammers to swingably secure the hammers;
the improvement comprising caps positioned over the leading edges of the arms and having side portions extending inwardly along the side faces of the arms, said caps being secured by pin assemblies in the arms and side portions but not protruding beyond the side portions, thereby leaving the spaces between the side portions free for the swinging of the hammers; said pin assemblies including two aligned pins in one assembly separable at a cleavage plane located in the central zone of the capped arm while the pin assembly is in pinning position, and each of the aligned pins being movable from the pinning position to permit removal of the cap, and each pin assembly being reliably secure in its pinning position during operation of the rotor.
the improvement comprising caps positioned over the leading edges of the arms and having side portions extending inwardly along the side faces of the arms, said caps being secured by pin assemblies in the arms and side portions but not protruding beyond the side portions, thereby leaving the spaces between the side portions free for the swinging of the hammers; said pin assemblies including two aligned pins in one assembly separable at a cleavage plane located in the central zone of the capped arm while the pin assembly is in pinning position, and each of the aligned pins being movable from the pinning position to permit removal of the cap, and each pin assembly being reliably secure in its pinning position during operation of the rotor.
2. In a hammermill rotor including as environment for this improvement a row of spaced rotor arms, mounted on and rotatable by a drive shaft, swing hammers in the spaces between the arms within a row, a hammerbolt extending axially through the arms and hammers to swingably secure the hammers;
the improvement comprising caps positioned over the leading edges of the arms and having side portions extending inwardly along the side faces of the arms, said caps being secured by pin assemblies in the arms and side portions but not protruding beyond the side portions, thereby leaving the spaces between the side portions free for the swinging of the hammers; said pin assemblies including two aligned tubular pins in one assembly separable at a cleavage plane located in the central zone of the capped arm while the pin assembly is in pinning position, a tie bolt extending through the pins and normally holding them in the pinning position, said tie bolt being removable without disassembly of the rotor, and each of the aligned pins being then movable from the pinning position to permit removal of the cap; and said pins having heads countersunk in the side portions making each pin assembly reliably secure in its pinning position during operation of the rotor.
the improvement comprising caps positioned over the leading edges of the arms and having side portions extending inwardly along the side faces of the arms, said caps being secured by pin assemblies in the arms and side portions but not protruding beyond the side portions, thereby leaving the spaces between the side portions free for the swinging of the hammers; said pin assemblies including two aligned tubular pins in one assembly separable at a cleavage plane located in the central zone of the capped arm while the pin assembly is in pinning position, a tie bolt extending through the pins and normally holding them in the pinning position, said tie bolt being removable without disassembly of the rotor, and each of the aligned pins being then movable from the pinning position to permit removal of the cap; and said pins having heads countersunk in the side portions making each pin assembly reliably secure in its pinning position during operation of the rotor.
3. In a hammermill rotor including as environment for this improvement a row of spaced rotor arms. mounted on and rotatable by a drive shaft, swing hammers in the spaces between the arms within a row, a hammerbolt extending axially through the arms and hammers to swingably support the hammers;
the improvement comprising caps positioned over the leading edges of the arms and having side portions extending inwardly along the side faces of the arms, said caps being secured by pin assemblies in the arms and side portions, but not protruding beyond the side portions, thereby leaving the spaces between the side portions free for the swinging of the hammers; said pin assemblies including two aligned tubular pins in one assembly separable at a cleavage plane located in the central zone of the capped arm while the pin assembly is in pinning position, a tie bolt extending through the pins and normally holding them in the pinning position, said tie bolt being removable without disassembly of the rotor, and each of the aligned pins being then movable from the pinning position to permit removal of the cap; said pins having heads countersunk in the side portions making each pin assembly reliably secure in its pinning position during operation of the rotor; and each tie bolt having its head and nut countersunk in the pins.
the improvement comprising caps positioned over the leading edges of the arms and having side portions extending inwardly along the side faces of the arms, said caps being secured by pin assemblies in the arms and side portions, but not protruding beyond the side portions, thereby leaving the spaces between the side portions free for the swinging of the hammers; said pin assemblies including two aligned tubular pins in one assembly separable at a cleavage plane located in the central zone of the capped arm while the pin assembly is in pinning position, a tie bolt extending through the pins and normally holding them in the pinning position, said tie bolt being removable without disassembly of the rotor, and each of the aligned pins being then movable from the pinning position to permit removal of the cap; said pins having heads countersunk in the side portions making each pin assembly reliably secure in its pinning position during operation of the rotor; and each tie bolt having its head and nut countersunk in the pins.
4. The improvement in a hammermill rotor according to claim 1, 2 or 3 in which at least one of the pins of a pin assembly is short enough to be removed from its pinning position through the space between the caps.
5. The improvement in a hammermill rotor according to claim 2 or 3 in which the total length of the two pins, when in abutment is sufficient to provide slight endplay to facilitate removal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA326,296A CA1127130A (en) | 1979-04-25 | 1979-04-25 | Caps for hammermill rotors secured by non-protruding individually removable pin assemblies |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA326,296A CA1127130A (en) | 1979-04-25 | 1979-04-25 | Caps for hammermill rotors secured by non-protruding individually removable pin assemblies |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1127130A true CA1127130A (en) | 1982-07-06 |
Family
ID=4114060
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA326,296A Expired CA1127130A (en) | 1979-04-25 | 1979-04-25 | Caps for hammermill rotors secured by non-protruding individually removable pin assemblies |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1127130A (en) |
-
1979
- 1979-04-25 CA CA326,296A patent/CA1127130A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |