# US 11,111,945 B2 · Multi-piece bolts and methods of making the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,111,945 B2 - Document ID: US11111945B2 - Status: Granted - Kind: B2 - Application number: 16/358,466 - Filed: 2019-03-19 - Published: 2019-10-10 - Granted: 2021-09-07 - Earliest claimed: 2018-04-05 - Assignees: Crushlock, Inc. - Applicants: Crushlock, Inc. - Inventors: Arnold R. Limatoc; Joel S. Peck; James P. Karins - Web page: https://patentgrep.com/patent/US11111945B2 ## CPC - F16B 31/04: for maintaining {a} tensile load - F16B 35/005: {Set screws; Locking means therefor} - F16B 31/024: {with the bottom of the nut or of the head of the bolt having gaps which close as the bolt tension increases, e.g. with lips or with a load-indicating flange} - F16B 39/284: Locking by means of elastic deformation ({F16B39/2825, F16B39/36,} F16B39/38 take precedence) - F16B 39/30: Locking exclusively by special shape of the screw-thread - F16B 5/02: by means of fastening members using screw-thread ({F16B5/0004 takes precedence}; construction of screw-threaded connections F16B25/00 - F16B39/00) - F16B 35/02: divided longitudinally - F16B 39/225: {by means of a settable material} - F16B: DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING (couplings for transmitting rotation F16D) ## Abstract A bolt includes a threaded shaft and a bolt head. The threaded shaft has a first end, a second opposing end, and an external thread. The first end includes a flared protrusion and the external thread is wrapped about the shaft and extends from the second opposing end to the flared protrusion. The bolt head includes an interior threaded bore for threadingly engaging the external thread of the threaded shaft, a front surface, and an opposing back surface having a recess configured to receive at least a portion of the flared protrusion of the threaded shaft therein. ## Claims ### Claim 1 A bolt comprising: a threaded shaft having a first end, a second opposing end, and an external thread, the first end including a flared protrusion, the external thread being wrapped about the shaft and extending from the second opposing end to the flared protrusion; and a bolt head including (i) an interior threaded bore for threadingly engaging the external thread of the threaded shaft, (ii) a front surface, and (iii) an opposing back surface having a recess configured to receive at least a portion of the flared protrusion of the threaded shaft therein, wherein at least a portion of the opposing back surface of the bolt head is welded to at least a portion of the flared protrusion of the threaded shaft. ### Claim 2 (depends on 1) The bolt of claim 1, wherein the flared protrusion of the threaded shaft has an outer surface that tapers inwardly in the direction from the first end of the threaded shaft towards the second opposing end of the threaded shaft. ### Claim 3 (depends on 2) The bolt of claim 2, wherein the recess of the bolt head has an inner surface that tapers inwardly from the opposing back surface of the bolt head towards the front surface of the bolt head. ### Claim 4 (depends on 3) The bolt of claim 3, wherein outer surface of the flared protrusion is inwardly tapered at a first angle relative to a central axis of the threaded shaft and the inner surface of the recess is inwardly tapered at a second angle relative to a central axis of the bolt head. ### Claim 5 (depends on 4) The bolt of claim 4, wherein the first angle is substantially equal to the second angle. ### Claim 6 (depends on 4) The bolt of claim 4, wherein the first angle, the second angle, or both is between about 30 degrees and about 60 degrees. ### Claim 7 (depends on 1) The bolt of claim 1, wherein the flared protrusion extends circumferentially around an outer diameter of the threaded shaft. ### Claim 8 A bolt comprising: a threaded shaft having a first end, a second opposing end, and an external thread, the first end including a flared protrusion, the external thread being wrapped about the shaft and extending from the second opposing end to the flared protrusion; and a bolt head including (i) an interior threaded bore for threadingly engaging the external thread of the threaded shaft, (ii) a front surface, and (iii) an opposing back surface having a recess configured to receive at least a portion of the flared protrusion of the threaded shaft therein, wherein the bolt is configured to be installed in conjunction with a nut that threadingly engages the threaded shaft of the bolt, thereby resulting in preload forces, and wherein the bolt head aids in distributing torsional forces during installation of the bolt with the nut towards the opposing back surface of the bolt head. ### Claim 9 (depends on 8) The bolt of claim 8, wherein the flared protrusion of the threaded shaft has an outer surface that tapers inwardly in the direction from the first end of the threaded shaft towards the second opposing end of the threaded shaft. ### Claim 10 (depends on 9) The bolt of claim 9, wherein the recess of the bolt head has an inner surface that tapers inwardly from the opposing back surface of the bolt head towards the front surface of the bolt head. ### Claim 11 (depends on 10) The bolt of claim 10, wherein outer surface of the flared protrusion is inwardly tapered at a first angle relative to a central axis of the threaded shaft and the inner surface of the recess is inwardly tapered at a second angle relative to a central axis of the bolt head. ### Claim 12 (depends on 11) The bolt of claim 11, wherein the first angle is substantially equal to the second angle. ### Claim 13 (depends on 8) The bolt of claim 8, wherein the flared protrusion extends circumferentially around an outer diameter of the threaded shaft. ### Claim 14 (depends on 8) The bolt of claim 8, wherein at least a portion of the opposing back surface of the bolt head is welded to at least a portion of the flared protrusion of the threaded shaft. ### Claim 15 A bolt comprising: a threaded shaft having a first end, a second opposing end, and an external thread, the first end including a flared protrusion, the external thread being wrapped about the shaft and extending from the second opposing end to the flared protrusion; and a bolt head including (i) an interior threaded bore for threadingly engaging the external thread of the threaded shaft, (ii) a front surface, and (iii) an opposing back surface having a recess configured to receive at least a portion of the flared protrusion of the threaded shaft therein, wherein the bolt is configured to be installed in conjunction with a nut that threadingly engages the threaded shaft of the bolt, thereby resulting in preload forces, and wherein engagement between the interior threaded bore and the external thread of the threaded shaft aids in distributing clamp load forces subsequent to installation of the bolt with the nut along an axial length of the threaded shaft. ### Claim 16 (depends on 15) The bolt of claim 15, wherein the flared protrusion of the threaded shaft has an outer surface that tapers inwardly in the direction from the first end of the threaded shaft towards the second opposing end of the threaded shaft. ### Claim 17 (depends on 16) The bolt of claim 16, wherein the recess of the bolt head has an inner surface that tapers inwardly from the opposing back surface of the bolt head towards the front surface of the bolt head. ### Claim 18 (depends on 17) The bolt of claim 17, wherein outer surface of the flared protrusion is inwardly tapered at a first angle relative to a central axis of the threaded shaft and the inner surface of the recess is inwardly tapered at a second angle relative to a central axis of the bolt head. ### Claim 19 (depends on 18) The bolt of claim 18, wherein the first angle is substantially equal to the second angle. ### Claim 20 (depends on 15) The bolt of claim 15, wherein the flared protrusion extends circumferentially around an outer diameter of the threaded shaft. ### Claim 21 (depends on 15) The bolt of claim 15, wherein at least a portion of the opposing back surface of the bolt head is welded to at least a portion of the flared protrusion of the threaded shaft. ### Claim 22 A bolt comprising: a threaded shaft having a first end, a second opposing end, an external thread, and a flared protrusion, the external thread being wrapped about the shaft and extending from the second opposing end to the flared protrusion; and a bolt head including: a main body including (i) an interior threaded bore, (ii) a front surface having a first recess, and (iii) an opposing back surface having a second recess configured to receive at least a portion of the flared end of the threaded shaft therein, and a deformable body including an interior threaded bore and an outer flange, the outer flange being coupled to the front surface of the main body such that a relief space is formed between the deformable body and the first recess of the main body. ### Claim 23 (depends on 22) The bolt of claim 22, wherein the flared protrusion of the threaded shaft has an outer surface that tapers inwardly in the direction from the first end of the threaded shaft towards the second opposing end of the threaded shaft and wherein the second recess has an inner surface that tapers inwardly in the direction from the opposing back surface of the main body towards the front surface of the main body. ### Claim 24 (depends on 23) The bolt of claim 23, wherein the outer surface of the flared protrusion of the threaded shaft is tapered at a first angle at a first angle relative to a central axis of the threaded shaft and the inner surface of the second recess of the main body is tapered at a second angle relative to a central axis of the main body. ### Claim 25 (depends on 24) The bolt of claim 24, wherein the first angle is different than the second angle. ### Claim 26 (depends on 24) The bolt of claim 24, wherein the first angle, the second angle, or both is between about 30 degrees and about 60 degrees. ### Claim 27 (depends on 22) The bolt of claim 22, wherein at least a portion of the opposing back surface of the main body of the bolt head is welded to at least a portion of the flared protrusion of the threaded shaft. ### Claim 28 (depends on 22) The bolt of claim 22, wherein the bolt is configured to be installed in conjunction with a nut that threadingly engages the threaded shaft of the bolt, thereby resulting in preload forces. ### Claim 29 (depends on 28) The bolt of claim 28, wherein the bolt head aids in distributing torsional forces during installation of the bolt with the nut towards the opposing back surface of the main body of the bolt head. ### Claim 30 (depends on 28) The bolt of claim 28, wherein engagement between the interior threaded bore and the external thread of the threaded shaft aids in distributing clamp load forces along an axial length of the threaded rod subsequent to installation of the bolt with the nut. ### Claim 31 (depends on 28) The bolt of claim 28, wherein the deformable body deforms into the first recess of the main body during installation of the bolt with the nut and aids in absorbing torsional strain energy during installation of the bolt with the nut.