# US 5,711,022 A · Starting position control for demolition apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,711,022 A - Document ID: US5711022A - Status: Granted - Kind: A - Application number: 08/572,090 - Filed: 1995-12-14 - Granted: 1998-01-20 - Earliest claimed: 1995-12-14 - Assignees: Laser Alignment, Inc. - Inventors: Timothy E. Steenwyk - Web page: https://patentgrep.com/patent/US5711022A ## CPC - E02F 3/965: {of metal-cutting or concrete-crushing implements (shearing devices B23D17/00; wrecking of buildings, e.g. tools therefor, E04G23/08)} - E04G 23/08: Wrecking of buildings (of fences E04H17/26; {Demolition agents based on cementitious or like materials C04B41/0009}) - E04G 23/082: {using shears, breakers, jaws and the like (metal-cutting or concrete-crushing implements mounted on backhoes E02F3/965)} - E02F: DREDGING; SOIL-SHIFTING (winning peat E21C49/00) - E04G: SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS ## Abstract A method and apparatus for demolishing a structure is disclosed. A crusher member (12) is provided supported by a support frame (14). A reference position vertically above an operator is established. The relative distance between the crusher member (12) and the reference position in a generally vertical direction is monitored. The crusher member (12) is guided to the reference position as a function of the relative distance in order to prepare for a demolition cycle of removing a portion of the structure. The crusher member (12) is then manually manipulated through a demolition cycle. ## Claims ### Claim 1 A method of demolishing a structure comprising: providing a crusher member supported by a support frame; establishing a reference position vertically above an operator; monitoring the relative distance between said crusher member and said reference position in a generally vertical direction; guiding said crusher member to said reference position as a function of said relative distance by providing an operator display of said relative distance in order to prepare for a demolition cycle of removing a portion of said structure; and manually manipulating said crusher member through said demolition cycle. ### Claim 2 (depends on 1) The method of claim 1 wherein said establishing a reference position includes receiving an operator input when said crusher member is at a desired position. ### Claim 3 (depends on 2) The method of claim 2 including manually manipulating said crusher member to said desired position. ### Claim 4 (depends on 1) The method of claim 1 wherein said guiding includes manually manipulating a portion of said support frame and automatically controlling another portion of said support frame in response to movement of said portion and to said relative distance. ### Claim 5 A hydraulic crusher apparatus, comprising: a base member, a crusher member and a connecting member interconnecting said crusher member with said base member; a first monitor for monitoring the relative positioning of said crusher member with respect to said connecting member and a second monitor for monitoring the relative positioning of said connecting member with respect to said base member; and a control that is responsive to said first and second monitors for determining a height of said crusher member with respect to said base member in order to guide said crusher member to return to a reference height above said base member. ### Claim 6 (depends on 5) The apparatus in claim 5 wherein said control includes a manual input for receiving a user input, wherein said control is responsive to said manual input for positioning said connecting member with respect to said base member and is responsive to said first and second monitors for positioning said crusher member at said reference height. ### Claim 7 (depends on 6) The apparatus in claim 6 wherein said control includes an operator display panel displaying the height of said crusher member relative to said reference position. ### Claim 8 (depends on 5) The apparatus in claim 5 wherein said control includes an operator display panel displaying the height of said crusher member relative to said reference position. ### Claim 9 (depends on 5) The apparatus in claim 5 wherein each said monitor includes a rotary encoder. ### Claim 10 A method of controlling a hydraulic crusher having a base member, a crusher member, and a connecting member interconnecting said crusher member with said base member, including: monitoring the relative position of said crusher member to said connecting member and the relative position of said connecting member to said base member; and determining a height of said crusher member with respect to said base member as a function of said position of said crusher member with respect to said connecting member and the relative position of said connecting member with respect to said base member; and guiding said crusher member to return to a reference height starting position. ### Claim 11 (depends on 10) The method of claim 10 wherein said guiding of said crusher member includes receiving a manual input for manipulating the position of said connecting member with respect to said base member and controlling the position of said crusher member with respect to said connecting member. ### Claim 12 (depends on 11) The method of claim 11 including displaying said height of said crusher member to an operator. ### Claim 13 (depends on 10) The method of claim 10 including displaying said height of said crusher member to an operator. ### Claim 14 (depends on 10) The method of claim 10 including receiving an operator selection of said reference height starting position. ### Claim 15 (depends on 10) The method of claim 10 wherein said receiving includes providing said operator with an input device and determining the height of said crusher member when said operator is actuating said input device. ### Claim 16 (depends on 15) The method of claim 15 wherein said providing an input device includes providing a foot switch. ### Claim 17 (depends on 10) The method of claim 10 further including determining a generally horizontal distance of said crusher member with respect to said base member as a function of said position of said crusher member with respect to said connecting member and said relative position of said connecting member with respect to said base member. ### Claim 18 A hydraulic crusher apparatus, comprising: a base member, a boom pivotally connected to said base member, a stick pivotally connected to said boom, and a pivoting jaw crusher member pivotally connected to said stick; a first monitor for a relative position of said crusher member with respect to said stick, a second monitor for a relative position of said stick with respect to said boom, and a third monitor for a relative position of said boom and said base member; and a control that is responsive to said monitors for determining a height of said crusher member with respect to said base member in order to guide said crusher member to return to a reference starting height above said base member. ### Claim 19 (depends on 18) The apparatus in claim 18 wherein said control includes a manual input for receiving a user input, wherein said control is responsive to said manual input for positioning said boom with respect to said base member and is responsive to said first, second and third monitors for positioning said crusher member at said reference start position. ### Claim 20 (depends on 19) The apparatus in claim 19 wherein said control includes an operator display panel displaying the height of said crusher member relative to said reference position. ### Claim 21 (depends on 18) The apparatus in claim 18 wherein said control includes an operator display panel displaying the height of said crusher member relative to said reference position. ### Claim 22 (depends on 18) The apparatus in claim 18 wherein each said monitor includes a rotary encoder. ### Claim 23 (depends on 18) The apparatus in claim 18 including an input device for receiving an operator selection of said reference height starting position and wherein said control determines said height of said crusher member when said input device is actuated. ### Claim 24 (depends on 23) The apparatus in claim 23 wherein said input device is a foot switch. ### Claim 25 (depends on 18) The apparatus in claim 18 wherein said control also determines a generally horizontal distance of said crusher member with respect to said base member as a function of said relative position of said crusher member with respect to said stick, said relative position of said stick with respect to said boom and said relative position of said boom with respect to said base member.