# US 4,394,810 A · Chain link repair device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,394,810 A - Document ID: US4394810A - Status: Granted - Kind: A - Application number: 06/207,210 - Filed: 1980-11-17 - Granted: 1983-07-26 - Earliest claimed: 1980-11-17 - Inventors: Larry E. Womble - Web page: https://patentgrep.com/patent/US4394810A ## CPC - B25B 25/00: Implements for fastening, connecting or tensioning of wire or strip - B21L 21/00: Tools or implements for repairing chains using metal-working operations, e.g. for detaching deformed chain links - B25B: TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING, OR HOLDING - B21L: MAKING METAL CHAINS (making chains or chain links by casting B22D25/02; chains in general F16G) ## Abstract The invention comprises a combination vise and breaker pin for facilitating repair of metal drive chains. The vise serves to pull the links of a chain together so that tension is maintained throughout the chain while links between vise jaws become loose and readily repairable. This feature is combined with a breaker pin moving within a hollow channel axial of a full thread hex head bolt. A breaker point having an annular shoulder is attached at one end of the breaker pin. The breaker pin is free to slide back and forth within the bolt except as limited by the annular shoulder. The breaker pin cooperates with a U-shaped cradle suitable for holding a link. The breaker point is brought into contact with the center bearing of a chain link when the left and right-hand jaws of the vise are moved toward one another. The bolt carrying the breaker pin is then tightened against the chain link bearing pin. If the chain link bearing pin is not dislodged, the workman may give the breaker pin a sharp rap with a hammer in order to dislodge the pin without damage to the bolt threads. ## Claims ### Claim 1 A chain link repair device for the repair or replacement of roller members of a roller drive chain comprising: (a) A pair of jaw-heads, (b) An elongated frame for the jaw-heads formed by means of a plurality of guide rods and at least one actuator screw all of which connect the jaw-heads with one another, (c) Means for securing the guide rods in rigid relationship with one of the jaw-heads while maintaining the other jaw-head in sliding relationship with the said plurality of guide rods, (d) Means for forcing the said jaw-heads towards each other when the actuator screw is rotated in a clockwise direction, (e) Engagement surfaces extending in a direction perpendicular to the guide rods and suitable for insertion between the links of a roller chain and engaging the rollers thereof, (f) A flange extending out of each of the said jaw-heads in a direction perpendicular to the said guide rods, (g) Impact Means provided on said flanges for transmitting a blow to drive a pin out of any of the rollers of the said roller chain. ### Claim 2 (depends on 1) The drive chain repair device of claim 1 in which the impact means for transmitting a blow to drive out the pin of a roller of the roller chain further comprises: (a) A first flange extending from one of the jaw-heads, (b) A second flange extending from the other of the two jaw-heads, (c) A generally parallel relationship between the first and second flanges, (d) Means provided on the first flange for advancing a threaded bolt through such flange towards the second flange, (e) Means on the second flange for snug receipt of a roller from the said roller chain so that the pin of such roller is in axial colinear relationship with the axis of said bolt. ### Claim 3 (depends on 2) The drive chain repair device of claim 2 wherein the bolt further comprises: (a) A cylindrical channel axial of said bolt, (b) An elongated pin for insertion into said channel having a length somewhat greater than the axial length of said bolt, (c) Means for retaining said elongated pin within said bolt, and (d) An impact point provided at the end of the elongated pin closest to said second flange. ### Claim 4 A chain link repair device for the repair or replacement of roller members of a roller drive chain comprising: (a) a pair of jaw-heads, (b) means for forcing said jaw-heads towards each other, (c) a first flange extending from one of the jaw-heads, (d) a second flange extending from the other of the two jaw-heads, (e) means provided on said first flange for advancing a threaded bolt through such flange towards the second flange, (f) means on the second flange for snug receipt of a roller from the said roller chain so that the pin of such roller is in axial colinear relationship with the axis of said bolt, (g) a cylindrical channel axial of said bolt, (h) an elongated pin for insertion into said channel having a length somewhat greater than the axial length of said bolt, (i) first and second ends on said pin, (j) means for retaining said elongated pin within said bolt, (k) an impact receiving sholder at said first end of said elongated pin, and (l) an impact transmitting breaker head at said second end of said elongated pin so that a hammer blow is transmitted axially of said bolt to said breaker head against said roller pin when said impact receiving sholder is struck. ### Claim 5 A chain link repair device for the repair or replacement of roller members of a roller drive chain comprising: (a) first and a second flange, (b) connection means for connecting said first and second flanges, (c) engaging means on the second flange for receipt of a roller from said roller chain so that the pin of such roller has an end exposed to said first flange, (d) advancing means on said first flange defining a channel in axial alignment with said roller pin exposed from said second flange for applying incremental force to such roller pin, and (e) an elongated pin for insertion into said channel having a length somewhat greater than the axial length of said channel so that a blow delivered to one end of said elongated pin is communicated to the roller pin exposed from said second flange.