# US 12,109,673 B1 · Vibration suppression bar handle structures for high-vibration handheld machines > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,109,673 B1 - Document ID: US12109673B1 - Status: Granted - Kind: B1 - Application number: 18/188,066 - Filed: 2023-03-22 - Published: 2024-09-26 - Granted: 2024-10-08 - Earliest claimed: 2023-03-22 - Assignees: City University of Hong Kong - Applicants: City University of Hong Kong - Inventors: Xingjian Jing - Web page: https://patentgrep.com/patent/US12109673B1 ## CPC - B25D 17/043: {Handles resiliently mounted relative to the hammer housing (B25D17/046 takes precedence)} - B25D 2217/0073: Arrangements for damping of the reaction force - B25D 2250/371: Use of springs - B25D: PERCUSSIVE TOOLS {(percussive machines for forging B21J; hand-held drilling machines, in general B23B45/00, for wood B27C3/08; drilling machines, used for mining or quarrying, with reciprocating tool which is turned intermittently when out of contact with the working face E21B1/00)} ## Abstract Vibration suppression handle structures for high-vibration handheld machines (e.g., jackhammers, hydraulic breakers, hammer drills, soil compactors, etc.) are provided that offer improved vibration suppression. The provided handle structures include a handle that is connected to vibration suppression systems that include an arrangement of support members and resilient members for improved vibration suppression over typical high-vibration handled machines while remaining a compact design. A portion of the support members are arranged as X-shaped support structures. In at least some embodiments, the handle structures include a system by which to adjust a stiffness, and therefore vibration suppression, of the vibration suppression systems. Jackhammers are further provided that include the provided vibration suppression handle structures. ## Claims ### Claim 1 A handle structure for vibration suppression comprising: a handle; and a vibration suppression system connected to the handle, wherein the vibration suppression system comprises: a first X-shaped support structure comprising a first support member rotatably connected to a second support member at a first joint; a second X-shaped support structure rotatably connected to the first X-shaped support structure at a second joint and a third joint, the second X-shaped support structure comprising a third support member rotatably connected to a fourth support member at a fourth joint; a first resilient member rotatably connected to the first support member and to the second support member; a second resilient member rotatably connected to the first, second, third, and fourth support members; a first pivot member comprising a first body, a first opening extending through the first body, and a first rod extending from the first body; and a shaft disposed through the first opening of the first pivot member, wherein the first support member and the second support member are configured to rotate about the first rod at the first joint. ### Claim 2 (depends on 1) The handle structure of claim 1, wherein the first resilient member is connected to a first connect member that is rotatably connected to the first support member at a fifth joint, and wherein the second resilient member is connected to a second connect member that is rotatably connected to the second support member at a sixth joint. ### Claim 3 (depends on 1) The handle structure of claim 1, further comprising a fifth support member and a sixth support member, wherein the first X-shaped support structure is rotatably connected to the fifth and sixth support members, and wherein the fifth support member is rotatably connected to the sixth support member. ### Claim 4 (depends on 1) The handle structure of claim 1, further comprising a seventh support member and an eighth support member, wherein the second X-shaped support structure is rotatably connected to the seventh and eighth support members, and wherein the seventh support member is rotatably connected to the eighth support member. ### Claim 5 (depends on 1) The handle structure of claim 1, further comprising: a second pivot member comprising a second body, a second opening extending through the second body, and a second rod extending from the second body, wherein the third support member and the fourth support member are configured to rotate about the second rod at the fourth joint, and wherein the shaft is disposed through the second opening of the second pivot member. ### Claim 6 (depends on 5) The handle structure of claim 5, further comprising a mount, wherein an end of the shaft is connected to the mount. ### Claim 7 (depends on 1) The handle structure of claim 1, wherein each of the first and second resilient members is a spring. ### Claim 8 A handle structure for vibration suppression comprising: a handle comprising a first leg and a second leg; a first vibration suppression system connected to the first leg, wherein the first vibration suppression system comprises: a first support member, a second support member rotatably connected to the first support member at a first joint, and a first resilient member rotatably connected to the first support member at a second joint and to the second support member at a third joint; and a second vibration suppression system connected to the second leg, wherein the second vibration suppression system comprises: a third support member, a fourth support member rotatably connected to the third support member at a fourth joint, and a second resilient member rotatably connected to the third support member at a fifth joint and to the fourth support member at a sixth joint. ### Claim 9 (depends on 8) The handle structure of claim 8, further comprising an adjustment system configured to set a stiffness of the first and second vibration suppression systems. ### Claim 10 (depends on 9) The handle structure of claim 9, wherein the adjustment system comprises: a shaft including a threaded portion; an adjusting member disposed around the shaft; a first stop member disposed around the shaft; a resilient member disposed around the shaft and between the adjusting member and the first stop member, wherein movement of the adjusting member along the shaft alters a stiffness of the resilient member; and a second stop member. ### Claim 11 (depends on 10) The handle structure of claim 10, further comprising a first mount, wherein the shaft is connected to the first mount, and wherein the handle includes the second stop member. ### Claim 12 (depends on 8) The handle structure of claim 8, wherein the first vibration suppression system further comprises: a fifth support member rotatably connected to the first support member at a seventh joint, a sixth support member rotatably connected to the fifth support member at an eight joint and to the second support member at a ninth joint, and a third resilient member rotatably connected to the first support member and the fifth support member at the seventh joint and to the second support member and the sixth support member at the ninth joint; and the second vibration suppression system further comprises: a seventh support member rotatably connected to the third support member at a tenth joint, an eighth support member rotatably connected to the seventh support member at an eleventh joint and to the fourth support member at a twelfth joint, and a fourth resilient member rotatably connected to the third support member and the seventh support member at the tenth joint and to the fourth support member and the eighth support member at the twelfth joint. ### Claim 13 (depends on 8) The handle structure of claim 8, wherein each of the first and second resilient members is a spring. ### Claim 14 A jackhammer comprising: a body; and a handle structure connected to the body, wherein the handle structure includes: a handle comprising a first leg and a second leg, wherein the handle is configured to translate relative to the body along a first axis, a first vibration suppression system connected to the first leg, wherein the first vibration suppression system comprises a first plurality of support members and a first plurality of resilient members, and wherein the first plurality of support members and the first plurality of resilient members are arranged such that the first vibration suppression system is configured to exhibit quasi-zero stiffness during operation of the jackhammer, and a second vibration suppression system connected to the second leg, wherein the second vibration suppression system comprises a second plurality of support members and a second plurality of resilient members, and wherein the second plurality of support members and the second plurality of resilient members are arranged such that the second vibration suppression system is configured to exhibit quasi-zero stiffness during operation of the jackhammer. ### Claim 15 (depends on 14) The jackhammer of claim 14, wherein the first and second vibration suppression systems are each configured to exhibit quasi-zero stiffness based on a force applied to the handle and a location of the handle relative to the body along the first axis. ### Claim 16 (depends on 14) The jackhammer of claim 14, wherein the handle structure further comprises an adjustment system configured to adjust a stiffness of the handle structure with respect to a direction along the first axis. ### Claim 17 (depends on 16) The jackhammer of claim 16, wherein the adjustment system comprises a first stop member and a second stop member, wherein the handle includes the second stop member, and wherein the second stop member contacts the first stop member when the handle is translated towards the body along the first axis. ### Claim 18 (depends on 14) The jackhammer of claim 14, wherein the body comprises a first side opposite a second side, wherein the first vibration suppression system is disposed on the first side of the body, and wherein the second vibration suppression system is disposed on the second side of the body. ### Claim 19 (depends on 14) The jackhammer of claim 14, wherein each of the first and second plurality of resilient members is a spring.