Abstract: Provided herein are methods for design of engineered polypeptides that recapitulate molecular structure features of a predetermined portion of several reference protein structures, e.g., related antibody epitopes or protein binding sites. A Machine Learning (ML) model may be used to generate engineered polypeptides. After substituting target residues for corresponding residues in other reference structures in the same scaffold, the scaffolds with each set of target residues may be filtered by structural comparison to identify generalized scaffolds. Generalized scaffolds may be improved by screening libraries of polypeptides.

Abstract: An inner subassembly for assembling a valve assembly includes a spool defining a central bore that extends axially through the spool forming a spool annular wall, and including a spool cone tip that is disposed at the first axial end, as well as a hydraulic activation ridge extending radially outwardly from the spool annular wall, and that is disposed axially between the second axial end and the first axial end. The spool may further define a first bypass bore. A stem defines a first flow bore that aligns with the first bypass bore.

Abstract: A dust cover for a hammer work tool, a hammer work tool, and a method of attaching the same are disclosed. The hammer work tool includes a housing, a power cell enclosed inside the housing, a tool member, and a detachable dust cover. When attached, the dust cover prevents particulate matter from entering the housing. When detached, a housing opening uncovered by the dust cover provides access to the power cell for maintenance and repairs. During installation, a housing rim and a locking tab of the hammer work tool are respectively received by a groove and a locking tab receiver of the dust cover. Advantageously, the dust cover is durable, cost effective, and easily attached and detached without the use of additional tools.

Abstract: An inner subassembly for assembling a valve assembly includes a spool defining a central bore that extends axially through the spool forming a spool annular wall, and including a spool cone tip that is disposed at the first axial end, as well as a hydraulic activation ridge extending radially outwardly from the spool annular wall, and that is disposed axially between the second axial end and the first axial end. The spool may further define a first bypass bore. A stem defines a first flow bore that aligns with the first bypass bore.

Abstract: A hydraulic hammer for a machine is provided. The hydraulic hammer includes a housing and a piston disposed within the housing and adapted to reciprocate along a longitudinal axis of the housing. The hydraulic hammer further includes a first chamber and a second chamber defined within the housing. The hydraulic hammer further includes a primary passage extending from an inlet and branching into a first passage and a second passage. The first passage fluidly communicates the primary passage with the first chamber and the second passage fluidly communicates the primary passage with the second chamber. The hydraulic hammer further includes a flow control device coupled to the first passage. The flow control device includes a valve element adapted to move between a first position and a second position based on an input signal indicative of a pressure of charge in the first chamber.

Abstract: A lubrication system for a hydraulically operated tool has a common lubricant supply manifold that receives a lubricant from one or more lubricant reservoirs. The common lubricant supply manifold includes an inlet port through which the lubricant is received and an exit port fluidly coupled with a lubricant supply line. The system also has a primer pump connected in fluid communication with the common lubricant supply manifold, a main lubricant supply pump, and a spring check valve downstream of the main lubricant supply pump. The lubricant supply line receives lubricant from the exit port and supplies the lubricant to the main lubricant supply pump. The main lubricant supply pump increases the pressure of the lubricant and pumps the lubricant through the spring check valve and into a fluid passageway leading to the hydraulically operated tool.

Abstract: A sleeve is disclosed for use with a piston of a hydraulic hammer. The sleeve may have a generally cylindrical body with a top end and a bottom end, and a central bore passing axially from the top end of the generally cylindrical body to the bottom end. The generally cylindrical body may be a composite structure including a guide layer forming an inner annular surface of the central bore, an energizer layer located radially outward of the guide layer and being bonded to the guide layer, and a support layer bonded to the energizer layer. The support layer may form an outer surface of the generally cylindrical body.

Abstract: A lubrication system for a hydraulic hammer is disclosed. The lubrication system includes a housing having a first chamber, and a control valve, disposed proximal to a first end of the first chamber, moveable from a closed position to an open position. A piston is received within the first chamber and moveable between a first position and a second position. The piston includes a first end having a cavity, and a second end facing towards a second chamber, which receives hydraulic fluid therein. In the second position, when the first chamber is filled with air in the first position of the piston, the cavity defined at the first end of the piston maintains pressure of the air less than a biasing force of a resilient member that keeps the control valve in the closed position.

Abstract: An accumulator assembly includes a vessel having an upper portion and a lower portion. The accumulator assembly includes a flexible membrane extending between the upper portion and the lower portion. The membrane may divide the vessel into a first interior chamber and a second interior chamber. The accumulator assembly includes a receptacle located proximate the vessel. The receptacle may be in fluid communication with the second interior chamber. The accumulator assembly includes a plunger located at least partially within the receptacle.

Abstract: A pressure indicator for a hydraulic hammer is provided. The pressure indicator includes a sleeve member configured to couple to an opening defined in a wall housing of an accumulator of the hydraulic hammer. The pressure indicator further includes a plunger slidably disposed within the sleeve member and movable between a first position and a second position with respect to the sleeve member. The plunger includes a first end disposed outside the wall housing of the accumulator. The plunger further includes a flange coupled to a second end. The pressure indicator further includes an elastic member inserted over the plunger and disposed between the wall housing of the accumulator and the flange. A position of the first end of the plunger with reference to an outer end of the sleeve member provides a visual indication of the pressure of the gas within the accumulator.

Abstract: A buffer system for a hydraulic hammer is disclosed. The buffer system includes a wear member disposed between a first component and a second component. The wear member includes a first surface. The first surface is adapted to abut an inner surface of the first component. The wear member also includes a second surface distal to the first surface. The second surface is adapted to abut an outer surface of the second component. The buffer system also includes an insert member disposed in the wear member between the first surface and the second surface thereof. The insert member provides a visual indication when a predefined thickness of the wear member between the first surface and the second surface is worn.

Abstract: A hydraulic hammer is provided. The hydraulic hammer includes a housing member. The hydraulic hammer also includes a power cell disposed within the housing member. The power cell includes an outer casing. The hydraulic hammer also includes a work tool operatively coupled with the power cell. The hydraulic hammer also includes one or more bushing parts arranged within the outer casing of the power cell. The one or more bushing parts are adapted to guide the work tool during an operation of the hydraulic hammer. The one or more bushing parts include a first surface and a second surface spaced apart from the first surface. The hydraulic hammer also includes a wear indicating system for indicating a wear of the one or more bushing parts with respect to the first surface. The wear indicating system includes a first passage and a second passage.

Abstract: A clearance control system for a hydraulic hammer is disclosed. The hydraulic hammer includes a housing member, a power cell disposed within the housing member, a wear member disposed between the housing member and the power cell, and a clearance control system for controlling the predefined clearance between the wear member and the power cell. The clearance control system includes a mounting boss and a fastening member disposed on the mounting boss. A first end of the fastening member is configured to receive an input from an operator and the second end is configured to contact with the first surface of the wear member. The fastening member is configured to move along a central axis defined by a threaded hole of the mounting boss to move the wear member towards the power cell, to control the predefined clearance between the wear member and the power cell.

Abstract: A hammer tool assembly for a machine is provided. A hammer tool assembly includes a power cell, a tool and a frame assembly. The frame assembly includes a first side plate and a second side plate. The hammer tool assembly includes a flange member extending from an outer periphery of an outer wall of the first and second side plates. The flange member includes a plurality of serrations that extend from the outer periphery of the outer wall of at least one of the first and second side plates. The hammer tool assembly also includes a plurality of blocks provided in surrounding contact with the power cell and an inner wall of the first and second side plates respectively.

Abstract: A lubrication system for a hydraulically operated tool has a common lubricant supply manifold that receives a lubricant from one or more lubricant reservoirs. The common lubricant supply manifold includes an inlet port through which the lubricant is received and an exit port fluidly coupled with a lubricant supply line. The system also has a primer pump connected in fluid communication with the common lubricant supply manifold, a main lubricant supply pump, and a spring check valve downstream of the main lubricant supply pump. The lubricant supply line receives lubricant from the exit port and supplies the lubricant to the main lubricant supply pump. The main lubricant supply pump increases the pressure of the lubricant and pumps the lubricant through the spring check valve and into a fluid passageway leading to the hydraulically operated tool.

Abstract: The present disclosure provides a sleeve for a hydraulic hammer. The sleeve includes an elongated body. The elongated body defines an outer surface, an inner surface, and a plurality of axial conduits to transmit hydraulic fluid. The elongated body further defines a plurality of radial holes extending from the plurality of axial conduits to the inner surface of the elongated body. The elongated body also defines a plurality of circumferential grooves on the inner surface. Each of the plurality of circumferential grooves is located along a longitudinal axis of the sleeve. The elongated body also defines at least one micro channel extending radially to form a fluid connection between each of the plurality of axial conduits and each of the plurality of circumferential grooves to transmit the hydraulic fluid for lubrication on the inner surface of the elongated body.

Abstract: A pressure indicator for a hydraulic hammer is provided. The pressure indicator includes a sleeve member configured to couple to an opening defined in a wall housing of an accumulator of the hydraulic hammer. The pressure indicator further includes a plunger slidably disposed within the sleeve member and movable between a first position and a second position with respect to the sleeve member. The plunger includes a first end disposed outside the wall housing of the accumulator. The plunger further includes a flange coupled to a second end. The pressure indicator further includes an elastic member inserted over the plunger and disposed between the wall housing of the accumulator and the flange. A position of the first end of the plunger with reference to an outer end of the sleeve member provides a visual indication of the pressure of the gas within the accumulator.

Abstract: An accumulator assembly includes a vessel having an upper portion and a lower portion. The accumulator assembly includes a flexible membrane extending between the upper portion and the lower portion. The membrane may divide the vessel into a first interior chamber and a second interior chamber. The accumulator assembly includes a receptacle located proximate the vessel. The receptacle may be in fluid communication with the second interior chamber. The accumulator assembly includes a plunger located at least partially within the receptacle.

Abstract: A buffer system for a hydraulic hammer is disclosed. The buffer system includes a wear member disposed between a first component and a second component. The wear member includes a first surface. The first surface is adapted to abut an inner surface of the first component. The wear member also includes a second surface distal to the first surface. The second surface is adapted to abut an outer surface of the second component. The buffer system also includes an insert member disposed in the wear member between the first surface and the second surface thereof. The insert member provides a visual indication when a predefined thickness of the wear member between the first surface and the second surface is worn.

Abstract: A hydraulic hammer assembly is disclosed. The hydraulic hammer assembly includes a piston and an accumulator membrane disposed external and coaxial to the piston The hydraulic hammer assembly includes a sleeve disposed coaxially between the piston and the accumulator membrane. The sleeve defines a first set of holes in an outer surface thereof to receive hydraulic fluid. The sleeve defines a second set of holes in an inner surface thereof and located distant from the first set of holes along a longitudinal axis of the sleeve. The sleeve defines a plurality of passages within a wall, and extending along the longitudinal axis. Each of the plurality of passages includes a porous medium to increase surface area of each of the plurality of passages. The increased surface area of each of the plurality of passages increases a rate of dissipation of heat from the wall of the sleeve.