Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
  • B25C—HAND-HELD NAILING OR STAPLING TOOLS; MANUALLY OPERATED PORTABLE STAPLING TOOLS
  • B25C1/00—Hand-held nailing tools; Nail feeding devices
  • B25C1/04—Hand-held nailing tools; Nail feeding devices operated by fluid pressure, e.g. by air pressure
  • B25C1/048—Hydraulically operated
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
  • B25C—HAND-HELD NAILING OR STAPLING TOOLS; MANUALLY OPERATED PORTABLE STAPLING TOOLS
  • B25C1/00—Hand-held nailing tools; Nail feeding devices
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
  • B25C—HAND-HELD NAILING OR STAPLING TOOLS; MANUALLY OPERATED PORTABLE STAPLING TOOLS
  • B25C1/00—Hand-held nailing tools; Nail feeding devices
  • B25C1/04—Hand-held nailing tools; Nail feeding devices operated by fluid pressure, e.g. by air pressure
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
  • B25C—HAND-HELD NAILING OR STAPLING TOOLS; MANUALLY OPERATED PORTABLE STAPLING TOOLS
  • B25C1/00—Hand-held nailing tools; Nail feeding devices
  • B25C1/06—Hand-held nailing tools; Nail feeding devices operated by electric power

Definitions

• the invention is based on a bolt pusher, with which bolts made of steel are inserted for fastening objects into hard material, for example in concrete.
• the known bolt pushers use a propellant charge to generate the feed force, which is ignited and drives a piston through the explosion gases released in the process. The piston then engages the head of the pin and pushes it out of the device.
• the invention has for its object to further improve a device for generating a sudden feed movement with regard to the safety of handling.
• the device should be able to serve, for example, as a drive for a bolt pusher.
• the invention proposes a device with the features of claim 1. Further developments of the invention are the subject of the dependent claims, the Wording as well as the wording of the summary is made by reference to the content of the description.
• the device proposed by the invention can be operated with a motor drive that has a lower hazard potential.
• an electric motor can be used as the drive, so that the device can be operated and handled like a conventional portable drill or drill.
• the energy can be supplied by a battery.
• the device uses the motor drive in order to tension the striking spring relatively slowly.
• the fully tensioned spring has the option of generating a sufficiently powerful feed, for example to drive a bolt into the ground with the same effect as with the previous explosion-operated devices.
• the feed device which transmits the force of the relaxing spring, can have a push rod, for example.
• This push rod can be guided in a corresponding guide and means can be provided in order to brake the push rod at the end of its movement if it has excess energy.
• the device also has a reset device for pushing the feed device back from the striking position into the starting position after the striking process has been carried out. This ensures that the device automatically and quickly returns to its starting position so that it is continuously used by a user can be used. Since the pushing back of the feed device can be carried out more slowly and with less force, the pushing back device can also be carried out by the drive itself. However, it can also be provided that the push-back device has a spring.
• the spring element of the spring for carrying out the impact process and / or the spring element of the return spring is a compressed gas.
• the actual spring element has a negligibly small mass, so that the spring can relax very quickly with high force.
• the feed device has a piston, on which the spring element acts directly.
• the push rod can be connected to a piston or can be formed in one piece with it, on which the compressed gas then acts directly.
• the push rod can also consist of several parts.
• the piston is a double-acting piston, on which the return spring also acts directly.
• the device proposed by the invention can have an axial piston guide.
• the trigger for triggering the setting process can in particular have a valve, the pressure gas of which starts the impact process when it is actuated.
• valve is opened to trigger the impact process.
• the invention further proposes to design the valve such that it has a self-reinforcing opening movement. This is to ensure that the valve opens very quickly as soon as it is triggered.
• the invention proposes that the valve is spring-loaded in the closed position.
• the spring force with which the valve is acted on in the closed position must first be overcome. This can be used to jerk the opening process of the valve.
• the trigger for triggering the setting process can be designed according to the invention so that it is triggered by the drive when a certain position is reached. This simplifies the handling of the device.
• the striking spring in the starting position of the feed device the striking spring is already biased.
• the drive has a tubular element arranged coaxially to the piston guide and displaceable in the longitudinal direction of the piston guide. This does the structure of the device is compact. At the same time, the tubular element is guided on the piston guide.
• a rotatable nut on an external thread of the bolt guide, which nut moves the tubular element when it is rotated via a bearing.
• Fig. 1 shows a longitudinal section through an embodiment of a proposed by the invention
• Fig. 2 shows a partial section through the right part in Fig. 1 of a bolt pusher in a second
• Fig. 1 shows schematically a longitudinal section through a bolt pusher that realizes the invention.
• the bolt pushing device contains a housing 1, which is only shown schematically.
• the housing 1 has at its one end, on the left in FIG. 1, a bore 2 through which a bolt to be inserted with the device can be inserted and from which it is driven out again.
• the bore 2 is arranged in a leg 3 of the housing 1. In the one on the left
• a piston guide 5 is inserted, preferably screwed in, which is approximately tubular and contains in its interior a cylindrical channel 6 for the bolt to be set.
• a piston guide 7 is screwed on, which contains a cylindrical interior 8. This cylindrical interior 8 is arranged coaxially to the cylindrical interior 6 of the bolt guide.
• the housing 1 contains an essentially cylindrical interior 9 which ends at a certain distance in front of the web 3. There is a distance between the web 3 and a surface 10 of the housing 1 delimiting the cavity 9, through which a motor (not shown in the figure), possibly with a gear, can access the device.
• a piston 11 is guided so as to be longitudinally displaceable and is formed in one piece at one end of a push rod 12.
• the piston contains a groove 13 for accommodating a sealing ring. With its free end 14 it rests against the shoulder formed by a constriction at the end of the piston guide 7.
• the free end 15 of the push rod 12 facing away from the piston 11 lies in the pin guide 5 and is intended to act on the head of a pin to be set.
• An outwardly leading opening 16 is arranged in the cylindrical jacket of the piston guide 7.
• An extension 17 is formed on the inside of the cavity 8 in the region of this opening.
• a tubular element 18 is slidably mounted in the longitudinal direction.
• This tubular element 18 also has openings or openings 19 which enable a connection between the cavity 8 within the piston guide 7 and the interior 9 of the housing 1. These openings 19 are present at several locations on the circumference of the tubular element 18.
• the outside of the bolt guide 5 is provided over part of its length with an external thread 20, which is indicated in the figure.
• a nut 21 is screwed onto the external thread 20 and has a flange 22 lying in a radial plane.
• a ball bearing 24 is inserted between the end face 23 of the flange 22 of the nut 21 facing the tubular element 18 and the tubular element 18.
• On the nut 21 can be attacked from the outside by the drive to twist it. When it is rotated, it simultaneously moves in the longitudinal direction of the pin guide 5, this movement being transmitted to the tubular element 18 via the ball bearing 24.
• a sleeve 25 is screwed into the cylindrical interior 9 of the housing 1 from the side opposite the web 3, the seals between the sleeve 25 and the housing 1 being omitted in the drawing for reasons of simplification.
• This sleeve 25 is sealed at its outward end by a washer 26.
• the opposite inner end of the sleeve 25 is coaxial with the tubular element 18, which is sealed with the aid of a seal, not shown, against the inside of the end of the sleeve 25.
• the tubular element 18 is thus sealed both from the outside of the piston guide 7 and from the inside of the sleeve 25.
• the interior 9 of the housing on the left side of the sleeve 25 in FIG. 1 and the interior of the sleeve 25 are separated from one another in a sealed manner.
• the disk 26 has a screwed into it centrally
• a shaft 32 of a release valve 33 is slidably guided. In the position shown, the shaft 32 is acted upon by an indicated compression spring 34. Here, too, there is a seal between the shaft 32 and the inside of the guide sleeve 27.
• a valve plate 34 is arranged within the space in the sleeve 25, the outer diameter of which is somewhat smaller than the outer diameter of the piston guide 7, but larger than that in FIG the associated end of the piston guide 7 opening 35. The valve 33 closes this opening 35.
• two plate springs 36 are arranged, the outer diameter of which is larger than the outer diameter of the piston guide 7.
• the tubular element 18 is sealed not only in the right part in FIG. 1 with respect to the sleeve 25, but also in the area of the surface 10 with respect to the housing 1 with the aid of a support ring 37 and with respect to the piston guide 7.
• the tubular element 18 is in the area of its outside formed such that this seal is present outside and inside not only in the position shown, but also when the tubular element 18 is moved away from the web 3 in the direction of the support disk 26.
• Gas under pressure is present in the interior 9 of the housing, possibly permeated with a certain amount of oil.
• the resulting pressure not only prevails outside the tubular element 18, but also inside the piston guide 7 because of the openings 19 and the opening 16. Since the diameter of the push rod 12 is smaller than the inside diameter of the piston guide 7, this pressure prevails on the underside 38 of the piston 11 and urges it into the position shown.
• a connection 39 is provided in the outer wall of the housing 1 for introducing the compressed gas.
• the space inside the sleeve 25 between the disc 28 and the end of the piston guide 7 is filled with oil.
• the trigger valve 33 is closed by the indicated compression spring 34.
• the oil in the space inside the sleeve 25 can therefore not reach the piston 11.
• the position shown in the figure, in which the piston 11 is displaced up to the end of the piston guide 7 and the tubular element 18 is displaced in the maximum possible position in the opposite direction, represents the starting position.
• the drive is actuated, that is, for example, an electric motor is switched on, which rotates the nut 21 with respect to the bolt guide 5 by means of a gear.
• This rotation leads to a simultaneous longitudinal displacement of the tubular element 18.
• the tubular element 18 has a spacer ring 40 in the region of its end facing the release valve 33, which contains lateral recesses 41. Pushing the tubular element 18 into the oil-filled space within the sleeve 25 leads to a tensioning of the gas spring between the disk 28 and the disk 26. When a certain position is reached, the end edge of the spacer ring 40 engages the disk springs 36.
• the piston guide is formed in two parts in the area facing the release valve 43.
• a sleeve element 45 is screwed on, which has a guide extension 45 on its outside in the axial extension of the piston.
• the disk 28 is guided on this guide attachment, which corresponds to the guide sleeve 27 in the embodiment in FIG. 1.
• the sleeve element has radial openings 46.
• the piston 11 has two piston sections 11a, 11b, which are separated from one another by a groove 48 for a sealing ring. In the starting position shown, the opening 46 is approximately centered on part 11b of the piston. Beyond the end face 14 of the piston, a small lateral opening 49 runs radially into the bottom of the sleeve 45.
• the release valve 43 is sleeve-like and encompasses the radial outside of the sleeve element 45. It is again acted upon by a spring 34 in the closed position.
• the pressure prevailing in the space inside the sleeve 25 passes through the openings 46 to the piston section 11b, but cannot achieve a feed effect there, since it does not reach the end face 14 of the piston.
• the tube element 18, which engages with its end face 50 on the opposite end face 51 of the release valve 43 is displaced to such an extent that the recesses 52 open the small radial opening 49, the pressure now also prevails on the end face 14.
• the piston is driven forward, and as soon as the sealing ring seated in the groove 13 has reached the opening 46, the movement of the piston is accelerated further, since the entire cross section of the openings 46 is now available.
• a force of approx. Four tons is achieved for driving nails into steel, approx. Two tons for concrete and approx. One ton for wood.
• the piston speed reaches values of forty to fifty meters per second.
• the spring takes about 0.1 seconds to relax, while the spring relaxes in about one millisecond.

Applications Claiming Priority (3)

Publications (1)

Family

ID=7868042

Family Applications (1)

Country Status (9)

Cited By (1)

Families Citing this family (2)

Family Cites Families (15)

• 1998
  • 1998-05-16 DE DE19822081A patent/DE19822081A1/de not_active Withdrawn
• 1999
  • 1999-05-15 PL PL99344159A patent/PL344159A1/xx unknown
  • 1999-05-15 HU HU0101499A patent/HUP0101499A3/hu unknown
  • 1999-05-15 WO PCT/EP1999/003363 patent/WO1999059779A1/de not_active Application Discontinuation
  • 1999-05-15 AU AU42626/99A patent/AU4262699A/en not_active Abandoned
  • 1999-05-15 US US09/700,605 patent/US6655472B1/en not_active Expired - Fee Related
  • 1999-05-15 EP EP99952084A patent/EP1085963A1/de not_active Withdrawn
  • 1999-05-15 SK SK1716-2000A patent/SK17162000A3/sk unknown
• 2000
  • 2000-11-15 HR HR20000780A patent/HRP20000780A2/hr not_active Application Discontinuation

Non-Patent Citations (1)

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