Systems and methods for assembling a hammer tool

Patent metadata

Field	Value
Publication number	US-2024191742-A1
Application number	US-202418586685-A
Country	US
Kind code	A1
Filing date	Feb 26, 2024
Priority date	Sep 23, 2021
Publication date	Jun 13, 2024
Grant date	—

Abstract

Systems and methods can include stretching a stud of a hammer assembly by tightening, according to a preset amount, a plurality of fasteners, which can extend from a first end surface and/or a second end surface of a first nut threadedly coupled to the stud, against an upper surface of a body of the hammer assembly. The fasteners and the first nut can provide a clamping load for the stud upon completion of the tightening. The systems and methods can also include, after the stretching, tightening a second nut, which can be threadedly connected to the stud, toward a seat formed in the body of the hammer assembly; and further tightening the second nut, against the seat. The systems and methods can further include transferring the clamping load from the fasteners and first nut to the second nut.

First claim

1 . A method comprising:
threading a collar assembly, which includes a first collar and a plurality of fasteners extending through respective threaded holes of the first collar, onto a first threaded portion of a tie rod such that the collar assembly directly contacts an upper surface of the body of a hammer assembly; tightening the fasteners to press against the upper surface of the body of the hammer assembly to stretch the tie rod and move a second collar, which is threaded onto a second threaded portion of the tie rod, away from a ledge inside the body of the hammer assembly by a predetermined distance; after said tightening the fasteners, hand-tightening the second collar to be in direct contact with the ledge formed inside the body of the hammer assembly and such that a portion of the body of the hammer assembly is around an outer sidewall of the second collar; and after said hand-tightening the second collar to be in direct contact with the ledge formed inside the body of the hammer assembly, further tightening the second collar against the ledge using a tightening tool.

2 . The method according to claim 1 , further comprising, after said further tightening:
removing the collar assembly from the first threaded portion of the tie rod; and disengaging the tightening tool from the second collar, wherein the portion of the body remains around the outer sidewall of the second collar after said removing the collar assembly and after said disengaging the tightening tool.

3 . The method according to claim 1 , further comprising repeating said threading the collar assembly, said tightening the fasteners, said hand-tightening the second collar, and said further tightening the second collar for one or more additional tie rods of the hammer assembly.

4 . The method according to claim 1 , wherein said tightening the fasteners is performed according to a predetermined pattern of opposing pairs of fasteners.

5 . The method according to claim 1 , further comprising, after said further tightening the second collar, loosening the collar assembly to fully transfer a clamping load provided by the collar assembly to the second collar.

6 . A method comprising:
stretching a stud of a hammer assembly by tightening, according to a preset amount, a plurality of jack bolts, which extend from a first end surface of a first nut threadedly coupled to the stud, against an upper surface of a body of the hammer assembly, the jack bolts and first nut providing a clamping load for the stud upon completion of said stretching; after said stretching, tightening a second nut, which is threadedly connected to the stud, toward a seat formed in the body of the hammer assembly; further tightening the second nut, against the seat, using a tightening tool; and transferring the clamping load from the jack bolts and first nut to the second nut.

7 . The method according to claim 6 , wherein said transferring the clamping load includes loosening the first nut.

8 . The method according to claim 6 , further comprising removing the tightening tool from engagement with the second nut.

9 . The method according to claim 6 , further comprising operating the hammer assembly without the first nut threadedly coupled to the stud and with at least a portion of the body of the hammer assembly provided around the second nut.

10 . The method according to claim 6 ,
wherein first end surface of the first nut is planar, and wherein upon completion of said stretching the stud of the hammer assembly, heads of all of the jack bolts contact the first end surface of the first nut.

11 . The method according to claim 6 , further comprising transferring the clamping load from the second nut to the jack bolts and first nut after said transferring the clamping load from the jack bolts and first nut to the second nut.

Assignees

• Caterpillar Inc

Inventors

• Moore Cody

Classifications

• E02F3/966

  of hammer-type tools (arrangements for breaking-up hard ground E02F5/305; percussion -type rippers E02F5/323) · CPC title

• E02F3/3604

  Devices to connect tools to arms, booms or the like · CPC title

• B25D2250/121

  Housing details · CPC title

• B25D2250/361

  Use of screws or threaded connections · CPC title

• F16B35/041

  Specially-shaped shafts (shape of thread F16B33/02) · CPC title